#!/bin/bash
# services/authelia.sh — Authelia SSO + 2FA portal (forward-auth for Caddy).
# Part of the modular post-install system (sourced by setup.sh).
#
# Can also be run standalone on any machine:
#   sudo bash authelia.sh
# (Docker must already be installed when run standalone)
#
# Ported from the authelia-setup repo / the monolith's working block.

# ── Standalone bootstrap ──────────────────────────────────────────────────────
# Detected when the script is executed directly rather than sourced by setup.sh.
# Sets up helpers and globals, then defers execution until after the function
# definition at the bottom of this file.
if [[ "${BASH_SOURCE[0]}" == "${0}" ]]; then
    [[ "$(id -u)" == "0" ]] || { echo "Run with sudo: sudo bash $0"; exit 1; }

    _SELF_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
    _COMMON="$_SELF_DIR/../lib/common.sh"

    if [[ -f "$_COMMON" ]]; then
        # Full repo present — use the real helpers (picks up ~/docker/.config too)
        # shellcheck source=../lib/common.sh
        source "$_COMMON"
    else
        # One-off copy — inline minimal stubs so the script works without the repo
        log_info()    { echo -e "\033[0;34m[INFO]\033[0m $*"; }
        log_success() { echo -e "\033[0;32m[OK]\033[0m $*"; }
        log_warning() { echo -e "\033[1;33m[WARN]\033[0m $*"; }
        log_error()   { echo -e "\033[0;31m[ERROR]\033[0m $*" >&2; }

        require_docker() {
            command -v docker &>/dev/null || {
                log_error "Docker not found. Install it first:"
                log_error "  curl -fsSL https://get.docker.com | sudo sh"
                return 1
            }
            docker compose version &>/dev/null || {
                log_error "Docker Compose plugin missing:"
                log_error "  sudo apt-get install -y docker-compose-plugin"
                return 1
            }
        }

        ensure_docker_dir_ownership() {
            chown -R "$ACTUAL_USER:$ACTUAL_USER" "$@" 2>/dev/null || true
        }

        port_in_use() {
            local _port="$1" _proto="${2:-tcp}"
            local _flag="-tlnH"
            [ "$_proto" = "udp" ] && _flag="-ulnH"
            ss "$_flag" "sport = :${_port}" 2>/dev/null | grep -q .
        }

        find_free_port() {
            local _varname="$1" _port="$2" _proto="${3:-tcp}"
            while port_in_use "$_port" "$_proto"; do
                _port=$((_port + 1))
            done
            eval "$_varname='$_port'"
        }

        # Match common.sh's eval-based pattern so local vars in install_* are set correctly
        prompt_text() {
            local _q="$1" _def="$2" _var="$3" _r
            [[ "${UNATTENDED:-false}" == "true" ]] && { eval "$_var='$_def'"; return; }
            read -r -p "  $_q " _r
            eval "$_var='${_r:-$_def}'"
        }

        prompt_yn() {
            local _q="$1" _def="$2" _var="$3" _r
            [[ "${UNATTENDED:-false}" == "true" ]] && { eval "$_var='$_def'"; return; }
            read -r -p "  $_q " _r
            eval "$_var='${_r:-$_def}'"
        }

        configure_caddy_for_service() {
            local _name="$1" _upstream="$2" _subdomain="$3" _extra="${4:-}"
            local _caddy_dir="$DOCKER_DIR/caddy"
            local _caddyfile="$_caddy_dir/Caddyfile"
            local _display_port="${_upstream##*:}"

            # Determine mode: local Caddy, remote Caddy, or none
            local _mode="none"
            [[ -d "$_caddy_dir" ]] && _mode="local"
            [[ -n "${CADDY_REMOTE_HOST:-}" ]] && [[ "$_mode" != "local" ]] && _mode="remote"
            [[ "$_mode" == "none" ]] && {
                log_info "Access $_name directly on port $_display_port."
                return 0
            }

            echo ""
            local _do_caddy=""
            if [[ "$_mode" == "remote" ]]; then
                log_info "Remote Caddy configured (${CADDY_REMOTE_HOST})."
                log_info "A snippet file will be saved to ~/docker/caddy-snippets/."
            fi
            read -r -p "  Configure Caddy reverse proxy for $_name? [y/N]: " _do_caddy
            [[ "${_do_caddy,,}" == "y" ]] || {
                log_info "Skipping — access at: http://localhost:$_display_port"
                return 0
            }

            # Domain prompt — pre-fill from SITE_DOMAIN when available
            local _default_domain=""
            if [[ -n "${SITE_DOMAIN:-}" ]] && [[ "$SITE_DOMAIN" != "example.com" ]]; then
                _default_domain="${_subdomain}.${SITE_DOMAIN}"
                log_info "Default: $_default_domain"
            fi
            local _domain=""
            read -r -p "  Domain [${_default_domain:-required}]: " _domain
            _domain="${_domain:-$_default_domain}"
            [[ -n "$_domain" ]] || { log_warning "No domain entered — skipping Caddy."; return 0; }

            # Build upstream — remote Caddy uses host IP:port, not container name
            local _block_upstream="$_upstream"
            if [[ "$_mode" == "remote" ]]; then
                _block_upstream="${CADDY_REMOTE_HOST}:${_display_port}"
            fi

            local _site_block
            _site_block="$(cat << CBLOCK

# $_name
${_domain} {
    reverse_proxy ${_block_upstream}

    header {
        Strict-Transport-Security "max-age=31536000; includeSubDomains; preload"
        X-Content-Type-Options "nosniff"
        X-Frame-Options "SAMEORIGIN"
        Referrer-Policy "strict-origin-when-cross-origin"
    }

    log {
        output file /var/log/caddy/${_domain}.log
        format json
    }
${_extra}
}
CBLOCK
)"

            if [[ "$_mode" == "local" ]]; then
                if [[ -f "$_caddyfile" ]]; then
                    local _bk="$_caddy_dir/Caddyfile.backup.$(date +%Y%m%d-%H%M%S)"
                    cp "$_caddyfile" "$_bk"
                    log_info "Backed up Caddyfile to $(basename "$_bk")"
                else
                    touch "$_caddyfile"
                fi

                if grep -q "^${_domain}" "$_caddyfile" 2>/dev/null; then
                    log_warning "$_domain already in Caddyfile"
                    local _ow=""
                    read -r -p "  Overwrite? [y/N]: " _ow
                    [[ "${_ow,,}" == "y" ]] || { log_info "Keeping existing entry."; return 0; }
                    sed -i "/^${_domain}/,/^}/d" "$_caddyfile"
                fi

                printf '%s\n' "$_site_block" >> "$_caddyfile"
                log_success "Added $_domain to Caddyfile"
                docker exec caddy caddy fmt --overwrite /etc/caddy/Caddyfile 2>/dev/null || true
                if docker exec caddy caddy reload --config /etc/caddy/Caddyfile 2>/dev/null; then
                    log_success "$_name accessible at: https://$_domain"
                else
                    log_warning "Reload failed — check: docker logs caddy"
                    log_info "Manual reload: docker exec caddy caddy reload --config /etc/caddy/Caddyfile"
                fi
            else
                local _snippet_dir="$DOCKER_DIR/caddy-snippets"
                local _snippet_file="$_snippet_dir/${_subdomain}.caddy"
                mkdir -p "$_snippet_dir"
                printf '%s\n' "$_site_block" > "$_snippet_file"
                chown "$ACTUAL_USER:$ACTUAL_USER" "$_snippet_file" 2>/dev/null || true
                log_success "Snippet saved: $_snippet_file"
                log_info "Copy to Caddy machine:"
                log_info "  scp $_snippet_file caddy-host:~/caddy-snippets/"
                log_info "  rsync -av $_snippet_dir/ caddy-host:~/caddy-snippets/  (all at once)"
            fi
        }
        write_readme() {
            local _dir="$1"; shift
            mkdir -p "$_dir"
            cat > "$_dir/README.md"
        }
        backup_if_exists() {
            local _file="$1"
            [ -f "$_file" ] || return 0
            cp -p "$_file" "${_file}.bak.$(date +%Y%m%d-%H%M%S)" 2>/dev/null
        }
    fi

    # Globals — ACTUAL_USER/ACTUAL_HOME must come before DOCKER_DIR
    # ($HOME under sudo is /root, not the real user's home)
    ACTUAL_USER="${ACTUAL_USER:-${SUDO_USER:-$USER}}"
    ACTUAL_HOME="$(getent passwd "$ACTUAL_USER" 2>/dev/null | cut -d: -f6 || echo "${HOME:-/root}")"
    DOCKER_DIR="${DOCKER_DIR:-$ACTUAL_HOME/docker}"
    DRY_RUN="${DRY_RUN:-false}"
    UNATTENDED="${UNATTENDED:-false}"
    SITE_TZ="${SITE_TZ:-$(cat /etc/timezone 2>/dev/null || echo UTC)}"
    SITE_DOMAIN="${SITE_DOMAIN:-example.com}"
    SITE_CADDY_NET="${SITE_CADDY_NET:-caddy_net}"

    register_service() { :; }   # no-op — no wizard to register into
    _RUN_STANDALONE=1
fi
# ─────────────────────────────────────────────────────────────────────────────

register_service authelia homelab "SSO + 2FA auth portal (Authelia)" 9091

install_authelia() {
    require_docker || return 1
    local AUTHELIA_DIR="$DOCKER_DIR/authelia"

    if [ "$DRY_RUN" = true ]; then
        echo "[DRY-RUN] Would set up Authelia:"
        echo "  • Create $AUTHELIA_DIR (config/secrets, data)"
        echo "  • Generate jwt/session/storage secrets + admin password hash"
        echo "  • Write docker-compose.yml, configuration.yml, users.yml, README.md"
        echo "  • Create the caddy_net network and add the forward-auth snippet to the Caddyfile"
        return 0
    fi

    # Don't clobber an existing install (it would regenerate secrets and break sessions).
    if [ -f "$AUTHELIA_DIR/docker-compose.yml" ]; then
        echo "  ⚠ Authelia already exists at $AUTHELIA_DIR."
        echo ""
        echo "    1) Add another protected domain to this instance (non-destructive —"
        echo "       one Authelia+Redis, multiple independent apex domains/logins)"
        echo "    2) Remove a protected domain added this way (undoes option 1 for one"
        echo "       domain — other services still pointed at it will stop authenticating)"
        echo "    3) Add a new user (creates a users.yml entry + password hash)"
        echo "    4) Manage an existing user (email, password reset, 2FA reset/exempt,"
        echo "       promote/demote admin, per-service access, delete)"
        echo "    5) Register an app to log in VIA Authelia (OIDC/SSO — e.g. ActualBudget,"
        echo "       Vaultwarden, or any other app with its own \"Enable OpenID\" setting)"
        echo "    6) Remove a registered OIDC app (undoes option 5 for one app — its own"
        echo "       separate password login, if it has one, is untouched)"
        echo "    7) Reconfigure from scratch (regenerates secrets/users — breaks"
        echo "       existing sessions for every domain already on this instance)"
        echo "    8) Show who has universal vs. service-scoped access"
        echo "    9) Change \"Remember me\" session duration (stay logged in longer)"
        echo "    10) Protect an existing site with this instance (pick a local Caddy site,"
        echo "       or type one on a different box — gates it with a login, same as any"
        echo "       other service already protected this way)"
        echo "    11) Un-protect a site (undoes option 10 for one site)"
        echo "    12) Export/import user data (backup accounts + 2FA before a reinstall,"
        echo "       or restore a previous export)"
        echo "    13) Make sure admins always have access to every site (old and new —"
        echo "       safe to re-run any time)"
        echo "    14) Rename an outside-access group (e.g. \"customer1\" -> \"acme-corp\")"
        echo "    15) Show every group's sites and users (site groups + user groups overview)"
        echo "    16) Add/remove users from a group (pick the group, then toggle members —"
        echo "       the reverse of option 4's per-user group toggle)"
        echo "    17) Bulk-assign several users to one group at once (e.g. \"1 4 5\" ->"
        echo "       internal, then \"2 3 7\" -> a named group), with each user's"
        echo "       current access shown alongside their name"
        echo "    0) Leave as-is / exit"
        echo ""
        local EXISTING_CHOICE=""
        prompt_text "  Choice [1-17, 0 to exit]:" "0" EXISTING_CHOICE
        case "$EXISTING_CHOICE" in
            1)
                add_authelia_domain
                return 0
                ;;
            2)
                remove_authelia_domain
                return 0
                ;;
            3)
                add_authelia_user
                return 0
                ;;
            4)
                edit_authelia_user
                return 0
                ;;
            5)
                _authelia_add_oidc_client
                return 0
                ;;
            6)
                _authelia_remove_oidc_client_menu
                return 0
                ;;
            7)
                : # fall through to the full reinstall flow below
                ;;
            8)
                _authelia_report_access_scope
                return 0
                ;;
            9)
                _authelia_set_remember_me
                return 0
                ;;
            10)
                _authelia_protect_site
                return 0
                ;;
            11)
                _authelia_unprotect_site
                return 0
                ;;
            12)
                _authelia_export_import_users_menu
                return 0
                ;;
            13)
                _authelia_ensure_admin_access_everywhere
                return 0
                ;;
            14)
                _authelia_rename_group
                return 0
                ;;
            15)
                _authelia_report_groups
                return 0
                ;;
            16)
                _authelia_manage_group_membership
                return 0
                ;;
            17)
                _authelia_bulk_assign_group
                return 0
                ;;
            0|*)
                echo "  Keeping existing Authelia. (Edit config/users.yml then: cd $AUTHELIA_DIR && docker compose restart authelia)"
                return 0
                ;;
        esac
    fi

    log_info "Installing Authelia..."
    mkdir -p "$AUTHELIA_DIR/config/secrets" "$AUTHELIA_DIR/data"

    # ── Collect configuration ────────────────────────────────────────────────
    echo ""
    echo "  Authelia needs a few details to configure."
    echo ""
    local CADDY_NET="${SITE_CADDY_NET:-caddy_net}"
    local AUTHELIA_DOMAIN AUTHELIA_PORTAL_SUBDOMAIN AUTHELIA_PORTAL_DOMAIN AUTHELIA_ADMIN_USER AUTHELIA_ADMIN_DISPLAY AUTHELIA_ADMIN_EMAIL
    local AUTHELIA_SMTP_HOST AUTHELIA_SMTP_PORT AUTHELIA_SMTP_USER AUTHELIA_SMTP_PASS AUTHELIA_TZ
    prompt_text "  Your domain (e.g., example.com):" "${SITE_DOMAIN:-example.com}" AUTHELIA_DOMAIN
    # Subdomain the login portal itself lives on — "auth" is just the
    # default, not a fixed convention. Every later function that needs this
    # domain's portal (add_authelia_domain for a DIFFERENT domain's own
    # portal, remove_authelia_domain, OIDC client registration, etc.) reads
    # it back from configuration.yml's session.cookies authelia_url instead
    # of assuming "auth." — see those functions for why.
    prompt_text "  Subdomain for the login portal (e.g. 'auth' -> auth.${AUTHELIA_DOMAIN}):" "auth" AUTHELIA_PORTAL_SUBDOMAIN
    # Auto-correct the full domain being typed here by mistake (e.g.
    # "authelia.mydomain.com" instead of just "authelia") — concatenating
    # that with .${AUTHELIA_DOMAIN} below would otherwise silently produce
    # a doubled, broken domain like "authelia.mydomain.com.mydomain.com"
    # that never matches any real request. Confirmed live: this is exactly
    # what happened on a real box, and it explained a much bigger mystery
    # than the obviously-wrong hostname alone would suggest — every
    # forward_auth-gated site on the instance silently bypassed Authelia,
    # because Caddy had no site block matching the real portal hostname at
    # all, so the forward_auth subrequest never reached real policy
    # evaluation in the first place.
    if [[ "$AUTHELIA_PORTAL_SUBDOMAIN" == *".${AUTHELIA_DOMAIN}" ]]; then
        AUTHELIA_PORTAL_SUBDOMAIN="${AUTHELIA_PORTAL_SUBDOMAIN%.${AUTHELIA_DOMAIN}}"
        log_info "That already included the domain — using just '${AUTHELIA_PORTAL_SUBDOMAIN}' as the subdomain."
    elif [[ "$AUTHELIA_PORTAL_SUBDOMAIN" == "$AUTHELIA_DOMAIN" ]]; then
        log_warning "That's the apex domain itself, not a subdomain — the portal can't live at the bare apex (it would collide with the wildcard rule protecting everything else). Using 'auth' instead."
        AUTHELIA_PORTAL_SUBDOMAIN="auth"
    fi
    AUTHELIA_PORTAL_DOMAIN="${AUTHELIA_PORTAL_SUBDOMAIN}.${AUTHELIA_DOMAIN}"
    prompt_text "  Admin username:" "admin" AUTHELIA_ADMIN_USER
    prompt_text "  Admin display name:" "Administrator" AUTHELIA_ADMIN_DISPLAY
    prompt_text "  Admin email:" "admin@${AUTHELIA_DOMAIN}" AUTHELIA_ADMIN_EMAIL
    prompt_text "  SMTP server (e.g., smtp.migadu.com):" "smtp.migadu.com" AUTHELIA_SMTP_HOST
    prompt_text "  SMTP port:" "587" AUTHELIA_SMTP_PORT
    prompt_text "  SMTP username (full email):" "authelia@${AUTHELIA_DOMAIN}" AUTHELIA_SMTP_USER
    prompt_text "  SMTP password:" "" AUTHELIA_SMTP_PASS
    prompt_text "  Timezone (e.g., America/New_York):" "${SITE_TZ:-America/New_York}" AUTHELIA_TZ

    # ── Secrets ──────────────────────────────────────────────────────────────
    echo ""
    echo "  Generating secrets..."
    echo "$(openssl rand -hex 32)" > "$AUTHELIA_DIR/config/secrets/jwt_secret"
    echo "$(openssl rand -hex 32)" > "$AUTHELIA_DIR/config/secrets/session_secret"
    echo "$(openssl rand -hex 32)" > "$AUTHELIA_DIR/config/secrets/storage_secret"
    echo "$AUTHELIA_SMTP_PASS"     > "$AUTHELIA_DIR/config/secrets/smtp_password"
    chmod 600 "$AUTHELIA_DIR/config/secrets/"*
    echo "  ✓ Secrets generated"

    # ── Admin password hash ──────────────────────────────────────────────────
    echo ""
    local AUTHELIA_TEMP_PASS AUTHELIA_HASH
    prompt_text "  Temporary password for admin (users reset via email):" "TempPass2026!" AUTHELIA_TEMP_PASS
    echo "  Generating password hash..."
    AUTHELIA_HASH=$(docker run --rm authelia/authelia:4.39.20 \
        authelia crypto hash generate argon2 --password "$AUTHELIA_TEMP_PASS" 2>/dev/null \
        | grep -oP '(?<=Digest: ).*' || echo "REPLACE_WITH_HASH")
    if [ "$AUTHELIA_HASH" = "REPLACE_WITH_HASH" ]; then
        log_warning "Could not generate hash automatically. After install run:"
        echo "    docker run --rm authelia/authelia:4.39.20 authelia crypto hash generate argon2 --password 'yourpassword'"
        echo "    then update $AUTHELIA_DIR/config/users.yml"
    else
        echo "  ✓ Password hash generated"
    fi

    ensure_docker_dir_ownership "$AUTHELIA_DIR"
    cd "$AUTHELIA_DIR" || return 1

    # ── .env ─────────────────────────────────────────────────────────────────
    backup_if_exists .env
    cat > .env << AUTHELIA_ENV
MY_DOMAIN=${AUTHELIA_DOMAIN}
SMTP_USER=${AUTHELIA_SMTP_USER}
DOCKER_MY_NETWORK=${CADDY_NET}
TZ=${AUTHELIA_TZ}
AUTHELIA_ENV

    # ── docker-compose.yml (quoted heredoc: ${SMTP_USER} resolved by compose/.env) ──
    backup_if_exists docker-compose.yml
    cat > docker-compose.yml << 'AUTHELIA_COMPOSE'
name: authelia

services:
  authelia:
    image: authelia/authelia:4.39.20
    pull_policy: missing
    container_name: authelia
    user: "1000:1000"
    volumes:
      - ./config:/config
      - ./data:/data
    environment:
      - AUTHELIA_IDENTITY_VALIDATION_RESET_PASSWORD_JWT_SECRET_FILE=/config/secrets/jwt_secret
      - AUTHELIA_SESSION_SECRET_FILE=/config/secrets/session_secret
      - AUTHELIA_STORAGE_ENCRYPTION_KEY_FILE=/config/secrets/storage_secret
      - AUTHELIA_NOTIFIER_SMTP_PASSWORD_FILE=/config/secrets/smtp_password
      - AUTHELIA_NOTIFIER_SMTP_USERNAME=${SMTP_USER}
      - AUTHELIA_NOTIFIER_SMTP_SENDER=Authelia <${SMTP_USER}>
    expose:
      - 9091
    restart: unless-stopped
    networks:
      - caddy_net

networks:
  caddy_net:
    external: true
AUTHELIA_COMPOSE
    [ "$CADDY_NET" != "caddy_net" ] && sed -i "s/caddy_net/${CADDY_NET}/g" docker-compose.yml

    # ── configuration.yml ────────────────────────────────────────────────────
    cat > config/configuration.yml << AUTHELIA_CONFIG
---
# Authelia configuration. Secrets injected via AUTHELIA_* env vars in compose.
theme: dark

server:
  address: tcp://0.0.0.0:9091

log:
  level: info
  file_path: /data/authelia.log

totp:
  period: 30
  skew: 1

authentication_backend:
  file:
    path: /config/users.yml
    password:
      algorithm: argon2
      argon2:
        variant: argon2id
        iterations: 3
        memory: 65536
        parallelism: 4
        key_length: 32
        salt_length: 16

access_control:
  default_policy: deny
  rules:
    # Admins always match first, on every domain this instance protects — this
    # rule must stay above any per-service scoping rule (old or new) below it,
    # or a group's "deny elsewhere" rule could accidentally catch an admin.
    # add_authelia_domain and _authelia_scope_access both preserve this
    # ordering automatically — see _authelia_ensure_admin_bypass.
    - domain: "*.${AUTHELIA_DOMAIN}"
      subject: "group:admins"
      policy: two_factor
    - domain: "*.${AUTHELIA_DOMAIN}"
      policy: two_factor

session:
  name: authelia_session
  expiration: 12h
  inactivity: 2h
  remember_me: 7d
  cookies:
    - domain: ${AUTHELIA_DOMAIN}
      authelia_url: https://${AUTHELIA_PORTAL_DOMAIN}
      default_redirection_url: https://${AUTHELIA_DOMAIN}

storage:
  local:
    path: /data/db.sqlite3

notifier:
  disable_startup_check: false
  smtp:
    address: smtp://${AUTHELIA_SMTP_HOST}:${AUTHELIA_SMTP_PORT}
    timeout: 10s
    identifier: localhost
    subject: "[Authelia] {title}"
    startup_check_address: ${AUTHELIA_SMTP_USER}
    disable_require_tls: false
    disable_starttls: false
AUTHELIA_CONFIG

    # ── users.yml ────────────────────────────────────────────────────────────
    cat > config/users.yml << AUTHELIA_USERS
---
# Authelia users database
# Add users: copy a block, change username/email/displayname, restart authelia.
# Generate a hash: docker run --rm authelia/authelia:4.39.20 authelia crypto hash generate argon2 --password 'thepassword'
# Login with username (not email). Use "Forgot Password" to set a real password.

users:
  ${AUTHELIA_ADMIN_USER}:
    displayname: "${AUTHELIA_ADMIN_DISPLAY}"
    email: ${AUTHELIA_ADMIN_EMAIL}
    password: "${AUTHELIA_HASH}"
    groups:
      - admins
      - users
AUTHELIA_USERS

    chown -R 1000:1000 "$AUTHELIA_DIR/config" "$AUTHELIA_DIR/data"
    log_success "Authelia configured at $AUTHELIA_DIR"

    # $CADDY_NET already exists at this point — require_docker (called at the
    # top of this function) creates it via ensure_caddy_network in lib/common.sh.

    # ── Caddyfile forward-auth snippet + portal block ────────────────────────
    local CADDY_FILE="$DOCKER_DIR/caddy/Caddyfile"
    if [ -f "$CADDY_FILE" ]; then
        echo "  Configuring Caddy for Authelia..."
        # Anchored to an actual, uncommented snippet definition — a bare
        # `grep -q "(authelia)"` also matches the commented-out example
        # block caddy.sh's starter Caddyfile ships ("# (authelia) {" as
        # documentation). Confirmed live: that false match made this skip
        # writing the real snippet entirely, leaving any later `import
        # authelia` reference elsewhere in the file dangling — Caddy then
        # refuses to start at all ("File to import not found: authelia"),
        # taking down every site it fronts, not just the Authelia-protected
        # one.
        if ! grep -qE '^\(authelia\)[[:space:]]*\{' "$CADDY_FILE"; then
            cp "$CADDY_FILE" "$CADDY_FILE.backup.$(date +%Y%m%d-%H%M%S)"
            { cat << 'SNIPPET_EOF'
# ── Authelia forward auth snippet ─────────────────────────────────────────────
(authelia) {
    forward_auth authelia:9091 {
        uri /api/authz/forward-auth
        copy_headers Remote-User Remote-Groups Remote-Name Remote-Email
    }
}

SNIPPET_EOF
              cat "$CADDY_FILE"; } > "$CADDY_FILE.tmp" && mv "$CADDY_FILE.tmp" "$CADDY_FILE"
            echo "  ✓ Authelia snippet added to Caddyfile"
        fi
        if ! grep -q "${AUTHELIA_PORTAL_DOMAIN}" "$CADDY_FILE"; then
            cat >> "$CADDY_FILE" << CADDY_AUTH_BLOCK

# ── Authelia login portal ──────────────────────────────────────────────────────
${AUTHELIA_PORTAL_DOMAIN} {
    # header_up pins X-Forwarded-Host to whatever the client actually sent.
    # Without it, Caddy's reverse_proxy recomputes X-Forwarded-Host from its
    # own incoming request (always ${AUTHELIA_PORTAL_DOMAIN} itself) and
    # overwrites the value a forward_auth caller (e.g. a remote site's
    # "forward_auth https://${AUTHELIA_PORTAL_DOMAIN}" block, see
    # services/asterisk.sh's droplet-mode Caddy block) set for its own domain. Confirmed
    # live: every forward-auth check evaluated as if it were for
    # ${AUTHELIA_PORTAL_DOMAIN} itself (which has policy: bypass in
    # access_control.rules so its own login portal isn't gated behind
    # itself), so every domain behind it silently passed through with no
    # 2FA prompt regardless of that domain's own policy.
    reverse_proxy authelia:9091 {
        header_up X-Forwarded-Host {http.request.header.X-Forwarded-Host}
    }
    log {
        output file /var/log/caddy/${AUTHELIA_PORTAL_DOMAIN}.log
    }
}
CADDY_AUTH_BLOCK
            echo "  ✓ Authelia portal block added for ${AUTHELIA_PORTAL_DOMAIN}"
        fi
        docker ps --format '{{.Names}}' | grep -q "^caddy$" && \
            { docker exec -w /etc/caddy caddy caddy reload 2>/dev/null && echo "  ✓ Caddy reloaded" || echo "  ⚠ Reload manually after checking the Caddyfile"; }
    else
        echo "  ℹ Caddy not installed yet — add the (authelia) snippet + ${AUTHELIA_PORTAL_DOMAIN} block to your Caddyfile later (see README)."
    fi

    # ── README for the service folder ────────────────────────────────────────
    write_readme "$AUTHELIA_DIR" << README_MD
# Authelia — SSO + 2FA portal

Single login (with TOTP two-factor) that protects any Caddy subdomain via
forward-auth. Portal: **https://${AUTHELIA_PORTAL_DOMAIN}**

## Layout
\`\`\`
$AUTHELIA_DIR/
├── docker-compose.yml
├── .env
├── config/
│   ├── configuration.yml
│   ├── users.yml
│   └── secrets/        # jwt/session/storage/smtp — never commit
└── data/               # sqlite db + log
\`\`\`

## Protect a service with Authelia
In that service's Caddy site block, add \`import authelia\`:
\`\`\`
myservice.${AUTHELIA_DOMAIN} {
    import authelia
    reverse_proxy localhost:PORT
}
\`\`\`
The \`(authelia)\` snippet and the \`auth.${AUTHELIA_DOMAIN}\` portal block were
added to \`$DOCKER_DIR/caddy/Caddyfile\` automatically.

## Protecting a second (or third) apex domain
Re-run this installer (\`sudo ./setup.sh authelia\` or \`sudo bash authelia.sh\`)
and choose **"Add another protected domain to this instance"** when it detects
the existing install. That domain gets its own \`session.cookies\` entry and its
own login portal (you'll be asked what subdomain to use — "auth" is just the
suggested default) — a separate login/session from ${AUTHELIA_DOMAIN},
so no accidental cross-domain SSO — but it's still one shared Authelia + Redis
container and one shared user database, not a second full stack. Cheaper than
standing up an entirely separate instance, and the right way to protect
multiple unrelated domains from the same box.

## Letting other apps log in via Authelia (OIDC/SSO)
Different from \`import authelia\` above: that gates a whole site behind a
login page before the request reaches it. This is for an app with its OWN
"Enable OpenID"/SSO setting (ActualBudget, Vaultwarden, etc.) that should
delegate ITS login to Authelia instead of a separate app-specific password.

Re-run this installer and choose **"Register an app to log in VIA
Authelia"** when it detects the existing install. Presets exist for
ActualBudget and Vaultwarden (their exact redirect URI is filled in
automatically); anything else works too via "Other/custom" — check that
app's own OIDC/SSO docs for its redirect URI path first.

First time this runs it also enables Authelia's OIDC provider itself
(generates a signing key + HMAC secret, one-time, automatic). Each
registered app gets its own Client ID/Secret under
\`identity_providers.oidc.clients\` in \`config/configuration.yml\` — the
secret is shown once at registration time and only the hash is kept.

Endpoints (needed if an app asks for them instead of a discovery URL):
- Discovery: \`https://${AUTHELIA_PORTAL_DOMAIN}/.well-known/openid-configuration\`
- Authorization: \`https://${AUTHELIA_PORTAL_DOMAIN}/api/oidc/authorization\`
- Token: \`https://${AUTHELIA_PORTAL_DOMAIN}/api/oidc/token\`
- UserInfo: \`https://${AUTHELIA_PORTAL_DOMAIN}/api/oidc/userinfo\`

## Manage
\`\`\`
cd $AUTHELIA_DIR
docker compose up -d        # start
docker compose restart authelia
docker compose logs -f authelia
docker compose down         # stop
\`\`\`

## Users
- Login with the **username** (not email). Admin user: \`${AUTHELIA_ADMIN_USER}\`.
- Both self-service paths need working SMTP: **Forgot Password** on the login
  screen emails a reset link, and even the in-portal **Settings → Change
  Password** page (for an already-logged-in user) sends a one-time code to
  their email to confirm the change — confirmed live, it is not a
  no-email path despite Authelia describing it as an in-session action.
  If SMTP isn't working yet, use the admin-side reset instead (next line),
  which never touches email.
- **Add a user:** re-run this installer (\`sudo ./setup.sh authelia\` or
  \`sudo bash authelia.sh\`) and choose **"Add a new user"** from the menu —
  it prompts for username/email/display name, generates the password hash,
  writes the \`users.yml\` block, and restarts Authelia for you.
- To add one by hand instead: copy a block in \`config/users.yml\`, change
  username/email/displayname, generate a hash, then
  \`docker compose restart authelia\`:
\`\`\`
docker run --rm authelia/authelia:4.39.20 authelia crypto hash generate argon2 --password 'thepassword'
\`\`\`
- Any user added this way can log into every OIDC app already registered on
  this instance (see "Letting other apps log in via Authelia" above) — access
  isn't scoped per-app by default, it's shared across the whole instance.

## Notes
- Authelia listens on 9091 **internally only** (no published port) and is
  reached through Caddy on the shared \`caddy_net\` docker network.
- Two-factor is **required** (\`default_policy: deny\`, rule \`two_factor\` for
  \`*.${AUTHELIA_DOMAIN}\`).
README_MD

    local START_AUTHELIA=""
    prompt_yn "Start Authelia now? (y/n):" "y" START_AUTHELIA
    if [ "$START_AUTHELIA" = "y" ] || [ "$START_AUTHELIA" = "Y" ]; then
        docker compose up -d 2>/dev/null && log_success "Authelia started" || log_warning "Failed to start Authelia"
    fi

    echo ""
    echo "  Auth portal:  https://${AUTHELIA_PORTAL_DOMAIN}"
    echo "  Admin login:  ${AUTHELIA_ADMIN_USER}  (use Forgot Password to set a real password)"
    echo "  README:       $AUTHELIA_DIR/README.md"
    echo ""
}

# Adds a second (or third, etc.) independent apex domain to an EXISTING Authelia
# instance instead of standing up a whole separate Authelia+Redis stack for it.
# Authelia natively supports this: session.cookies and access_control.rules are
# both lists, so one instance can hold a distinct cookie scope + login portal per
# domain, each with its own session (no cross-domain SSO, but also no collision —
# see the "Running more than one Authelia instance" note in CLAUDE.md for why two
# domains can't just share one session.cookies entry). Far cheaper on RAM than a
# second full instance, which matters most on a small droplet.
add_authelia_domain() {
    local AUTHELIA_DIR="$DOCKER_DIR/authelia"
    local CONFIG_FILE="$AUTHELIA_DIR/config/configuration.yml"
    local CADDY_FILE="$DOCKER_DIR/caddy/Caddyfile"

    if [ ! -f "$CONFIG_FILE" ]; then
        log_warning "No configuration.yml found at $CONFIG_FILE — install Authelia first."
        return 1
    fi

    echo ""
    echo "  Add another apex domain to this Authelia instance."
    echo "  It gets its own session-cookie scope and its own login portal (you'll pick"
    echo "  the subdomain next — a separate login/session from your other domain(s))"
    echo "  but shares this same Authelia + Redis container, not a second full stack."
    echo ""
    local NEW_DOMAIN=""
    prompt_text "  New domain (e.g., example.com):" "" NEW_DOMAIN
    if [ -z "$NEW_DOMAIN" ]; then
        log_warning "No domain entered — nothing to do."
        return 0
    fi

    if grep -qF "\"*.${NEW_DOMAIN}\"" "$CONFIG_FILE" 2>/dev/null; then
        log_warning "$NEW_DOMAIN is already configured in $CONFIG_FILE — nothing to do."
        return 0
    fi

    local NEW_PORTAL_SUBDOMAIN NEW_PORTAL_DOMAIN
    prompt_text "  Subdomain for this domain's own login portal (e.g. 'auth' -> auth.${NEW_DOMAIN}):" "auth" NEW_PORTAL_SUBDOMAIN
    # See install_authelia's identical guard on AUTHELIA_PORTAL_SUBDOMAIN
    # for why this matters — typing the full domain here instead of just
    # the subdomain silently produces a doubled, broken hostname that
    # never matches any real request.
    if [[ "$NEW_PORTAL_SUBDOMAIN" == *".${NEW_DOMAIN}" ]]; then
        NEW_PORTAL_SUBDOMAIN="${NEW_PORTAL_SUBDOMAIN%.${NEW_DOMAIN}}"
        log_info "That already included the domain — using just '${NEW_PORTAL_SUBDOMAIN}' as the subdomain."
    elif [[ "$NEW_PORTAL_SUBDOMAIN" == "$NEW_DOMAIN" ]]; then
        log_warning "That's the apex domain itself, not a subdomain — the portal can't live at the bare apex (it would collide with the wildcard rule protecting everything else). Using 'auth' instead."
        NEW_PORTAL_SUBDOMAIN="auth"
    fi
    NEW_PORTAL_DOMAIN="${NEW_PORTAL_SUBDOMAIN}.${NEW_DOMAIN}"

    # ── access_control.rules: insert right after "rules:" ────────────────────
    # The admin-bypass rule goes first, this domain's own catch-all second —
    # both inserted together in one shot so a fresh domain never has a window
    # where the catch-all exists without the bypass above it. See
    # _authelia_ensure_admin_bypass for why this ordering has to hold.
    awk -v domain="$NEW_DOMAIN" '
        { print }
        /^  rules:$/ && !done {
            print "    - domain: \"*." domain "\""
            print "      subject: \"group:admins\""
            print "      policy: two_factor"
            print "    - domain: \"*." domain "\""
            print "      policy: two_factor"
            done=1
        }
    ' "$CONFIG_FILE" > "$CONFIG_FILE.tmp" && mv "$CONFIG_FILE.tmp" "$CONFIG_FILE"

    # ── session.cookies: insert right after "cookies:" ────────────────────────
    awk -v domain="$NEW_DOMAIN" -v portal="$NEW_PORTAL_DOMAIN" '
        { print }
        /^  cookies:$/ && !done {
            print "    - domain: " domain
            print "      authelia_url: https://" portal
            print "      default_redirection_url: https://" domain
            done=1
        }
    ' "$CONFIG_FILE" > "$CONFIG_FILE.tmp" && mv "$CONFIG_FILE.tmp" "$CONFIG_FILE"

    chown 1000:1000 "$CONFIG_FILE" 2>/dev/null || true
    log_success "Added $NEW_DOMAIN to $CONFIG_FILE (access_control rule + session cookie scope)"

    # ── Caddy portal block for the new domain ─────────────────────────────────
    if [ -f "$CADDY_FILE" ]; then
        if ! grep -qx "${NEW_PORTAL_DOMAIN} {" "$CADDY_FILE"; then
            cat >> "$CADDY_FILE" << CADDY_AUTH_BLOCK2

# ── Authelia login portal (${NEW_DOMAIN}) ─────────────────────────────────────
${NEW_PORTAL_DOMAIN} {
    # See this instance's other portal block(s) above for why header_up
    # X-Forwarded-Host is required here, not optional.
    reverse_proxy authelia:9091 {
        header_up X-Forwarded-Host {http.request.header.X-Forwarded-Host}
    }
    log {
        output file /var/log/caddy/${NEW_PORTAL_DOMAIN}.log
    }
}
CADDY_AUTH_BLOCK2
            echo "  ✓ Authelia portal block added for ${NEW_PORTAL_DOMAIN}"
            docker ps --format '{{.Names}}' | grep -q "^caddy$" && \
                { docker exec -w /etc/caddy caddy caddy reload 2>/dev/null && echo "  ✓ Caddy reloaded" || echo "  ⚠ Reload manually: docker exec caddy caddy reload --config /etc/caddy/Caddyfile"; }
        else
            echo "  ✓ ${NEW_PORTAL_DOMAIN} portal block already exists in the Caddyfile"
        fi
    else
        echo "  ℹ Caddy not installed — add a ${NEW_PORTAL_DOMAIN} portal block manually later (see README)."
    fi

    # ── Restart Authelia to pick up the new config ────────────────────────────
    local RESTART_AUTH=""
    prompt_yn "  Restart Authelia to apply the new domain? (y/n):" "y" RESTART_AUTH
    if [ "$RESTART_AUTH" = "y" ] || [ "$RESTART_AUTH" = "Y" ]; then
        (cd "$AUTHELIA_DIR" && docker compose restart authelia 2>/dev/null) \
            && log_success "Authelia restarted" \
            || log_warning "Restart failed — check: docker compose logs authelia"
    fi

    echo ""
    echo "  Auth portal for $NEW_DOMAIN: https://${NEW_PORTAL_DOMAIN}"
    echo "  Protect a service under this domain the same way as any other:"
    echo "    myservice.${NEW_DOMAIN} {"
    echo "        import authelia"
    echo "        reverse_proxy localhost:PORT"
    echo "    }"
    echo "  Same users/passwords work across every domain on this instance —"
    echo "  it's one shared user database, just separate sessions per domain."
    echo ""
}

# Removes a login-portal Caddy block add_authelia_domain() writes — same
# bounded-block technique used elsewhere in this repo for Caddy site blocks
# (find the opening "<portal-domain> {" line, walk forward to the matching
# unindented "}"). Takes the portal's own FULL domain, not the apex it
# belongs to and an assumed "auth." prefix — the portal subdomain is
# user-chosen at the time it's added (see add_authelia_domain), so it can't
# be reconstructed from the apex alone. Callers read it back from that
# domain's own session.cookies authelia_url entry before removing it.
_authelia_remove_caddy_portal_block() {
    local portal_domain="$1"
    local caddy_file="$DOCKER_DIR/caddy/Caddyfile"
    [ -f "$caddy_file" ] || return 0

    local domain_line end_line start_line
    domain_line="$(grep -nx "${portal_domain} {" "$caddy_file" | head -1 | cut -d: -f1)"
    [ -z "$domain_line" ] && return 0

    start_line="$domain_line"
    if [ "$domain_line" -gt 1 ] && sed -n "$((domain_line - 1))p" "$caddy_file" | grep -qE '^# '; then
        start_line=$((domain_line - 1))
    fi

    end_line="$(tail -n "+$domain_line" "$caddy_file" | grep -nx '}' | head -1 | cut -d: -f1)"
    if [ -z "$end_line" ]; then
        log_warning "Could not find the end of ${portal_domain}'s Caddy block — leaving it as-is."
        return 1
    fi
    end_line=$((domain_line + end_line - 1))

    sed -i "${start_line},${end_line}d" "$caddy_file"
    log_info "Removed the ${portal_domain} Caddy portal block."
    docker ps --format '{{.Names}}' 2>/dev/null | grep -q "^caddy$" && \
        { docker exec -w /etc/caddy caddy caddy reload 2>/dev/null && log_success "Caddy reloaded" \
            || log_warning "Reload manually: docker exec caddy caddy reload --config /etc/caddy/Caddyfile"; }
}

# Reverse of add_authelia_domain() — removes one apex domain's
# access_control.rules entry, session.cookies entry, and its auth.<domain>
# Caddy portal block from this instance. Undoes a domain added by mistake
# (wrong value entered, or a domain that turned out to already be covered by
# an existing apex's wildcard rule — see the menu's own warning text). Does
# NOT touch any other domain already on this instance, and does NOT find or
# fix whatever individual services still point "import authelia"/forward_auth
# at this instance for the removed domain — those start failing to
# authenticate (no session-cookie scope left to complete a login against)
# the moment this runs, so this is for cleaning up a domain that's not
# actually in use this way, not a way to quietly de-protect a live service.
remove_authelia_domain() {
    local AUTHELIA_DIR="$DOCKER_DIR/authelia"
    local CONFIG_FILE="$AUTHELIA_DIR/config/configuration.yml"

    if [ ! -f "$CONFIG_FILE" ]; then
        log_warning "No configuration.yml found at $CONFIG_FILE — install Authelia first."
        return 1
    fi

    local -a apex_domains
    # Each apex domain now has two rules sharing this exact domain string —
    # its admin-bypass rule and its plain catch-all (see
    # _authelia_ensure_admin_bypass) — so dedupe or it'd list every domain twice.
    mapfile -t apex_domains < <(grep -oE '^    - domain: "\*\.[^"]+"' "$CONFIG_FILE" | sed -E 's/^    - domain: "\*\.(.+)"$/\1/' | awk '!seen[$0]++')

    echo ""
    if [ "${#apex_domains[@]}" -eq 0 ]; then
        log_info "No apex domains found on this instance."
        return 0
    fi
    echo "  Domains currently on this Authelia instance:"
    local i
    for i in "${!apex_domains[@]}"; do
        echo "    $((i + 1))) ${apex_domains[$i]}"
    done
    echo "    0) Cancel"
    echo ""
    echo "  Note: this removes a whole apex domain entry added via 'Add another"
    echo "  protected domain' — if you meant to protect a SUBDOMAIN of an apex"
    echo "  already listed above, you don't need this at all: it's already covered"
    echo "  by that apex's wildcard rule and session-cookie scope. Just point that"
    echo "  subdomain's Caddy block at this instance's existing login portal for that"
    echo "  apex instead of adding it here as its own entry — option 10 (Protect an"
    echo "  existing site) will find and use the right one automatically."
    echo ""
    local RM_CHOICE=""
    prompt_text "  Number to remove, or 0 [0]:" "0" RM_CHOICE
    if ! [[ "$RM_CHOICE" =~ ^[0-9]+$ ]] || [ "$RM_CHOICE" -lt 1 ] || [ "$RM_CHOICE" -gt "${#apex_domains[@]}" ]; then
        log_info "Cancelled — nothing changed."
        return 0
    fi
    local RM_DOMAIN="${apex_domains[$((RM_CHOICE - 1))]}"

    # Read the portal's own domain back from this apex's session.cookies
    # entry — it's whatever subdomain was chosen when this domain was added
    # (see add_authelia_domain), not necessarily "auth.<domain>", so it
    # can't be assumed. Must happen before the removal below, which deletes
    # this exact entry.
    local RM_PORTAL_DOMAIN
    RM_PORTAL_DOMAIN="$(awk -v domain="$RM_DOMAIN" '
        $0 == "    - domain: " domain { f=1; next }
        f && /authelia_url:/ { print $2; exit }
    ' "$CONFIG_FILE" | sed -E 's#^https?://##')"
    [ -z "$RM_PORTAL_DOMAIN" ] && RM_PORTAL_DOMAIN="auth.${RM_DOMAIN}"

    echo ""
    log_warning "This removes ${RM_DOMAIN}'s access rule, session-cookie scope, and its"
    log_warning "${RM_PORTAL_DOMAIN} login portal from THIS Authelia instance."
    log_warning "Any service still using 'import authelia' or forward_auth pointed at"
    log_warning "${RM_DOMAIN} will start failing to authenticate — reconfigure or remove"
    log_warning "those first if they're still live."
    local CONFIRM_RM=""
    prompt_yn "  Continue? (y/n):" "n" CONFIRM_RM
    [[ "$CONFIRM_RM" =~ ^[Yy]$ ]] || { log_info "Cancelled — nothing changed."; return 0; }

    # ── access_control.rules: remove this domain's admin-bypass rule first ────
    # (3 lines: domain/subject/policy — see _authelia_ensure_admin_bypass) —
    # has to run before the plain catch-all removal below, which only knows
    # how to strip a 2-line domain/policy pair and would otherwise leave this
    # rule's own "policy:" line orphaned, the exact corruption class this
    # instance was repaired from once already.
    awk -v domain="$RM_DOMAIN" '
        BEGIN { skip=0 }
        skip > 0 { skip--; next }
        $0 == "    - domain: \"*." domain "\"" {
            getline nxt
            if (nxt == "      subject: \"group:admins\"") { skip=1; next }
            print; print nxt; next
        }
        { print }
    ' "$CONFIG_FILE" > "$CONFIG_FILE.tmp" && mv "$CONFIG_FILE.tmp" "$CONFIG_FILE"

    # ── access_control.rules: remove the "- domain: "*.X"" + "policy: ..." pair ──
    awk -v domain="$RM_DOMAIN" '
        BEGIN { skip=0 }
        skip == 1 { skip=0; next }
        $0 == "    - domain: \"*." domain "\"" { skip=1; next }
        { print }
    ' "$CONFIG_FILE" > "$CONFIG_FILE.tmp" && mv "$CONFIG_FILE.tmp" "$CONFIG_FILE"

    # ── session.cookies: remove the "- domain: X" + 2 following lines ─────────
    awk -v domain="$RM_DOMAIN" '
        BEGIN { skip=0 }
        skip > 0 { skip--; next }
        $0 == "    - domain: " domain { skip=2; next }
        { print }
    ' "$CONFIG_FILE" > "$CONFIG_FILE.tmp" && mv "$CONFIG_FILE.tmp" "$CONFIG_FILE"

    chown 1000:1000 "$CONFIG_FILE" 2>/dev/null || true
    log_success "Removed ${RM_DOMAIN} from $CONFIG_FILE"

    _authelia_remove_caddy_portal_block "$RM_PORTAL_DOMAIN"

    local RESTART_AUTH=""
    prompt_yn "  Restart Authelia to apply? (y/n):" "y" RESTART_AUTH
    if [ "$RESTART_AUTH" = "y" ] || [ "$RESTART_AUTH" = "Y" ]; then
        (cd "$AUTHELIA_DIR" && docker compose restart authelia 2>/dev/null) \
            && log_success "Authelia restarted" \
            || log_warning "Restart failed — check: docker compose logs authelia"
    fi
}

# Lists this box's local Caddy sites by number for convenience, then lets
# the caller pick one OR just type a domain directly — including one not on
# this box's Caddy at all, since this only ever offers the list, never
# requires picking from it. Shared by every prompt in this file that needs
# "a domain, ideally from Caddy" (protecting/un-protecting a site, and the
# OIDC "what domain is this app on" prompt) so they behave the same way
# instead of each re-implementing their own version of "type it out fully."
# Echoes the chosen domain on stdout (empty if nothing entered); the
# listing itself goes to stderr so it never ends up captured by a caller
# using $(...) to grab the echoed domain.
_authelia_pick_domain() {
    local prompt_label="$1"
    local caddy_file="$DOCKER_DIR/caddy/Caddyfile"
    local -a site_domains
    [ -f "$caddy_file" ] && mapfile -t site_domains < <(grep -oE '^[A-Za-z0-9][A-Za-z0-9.-]*\.[A-Za-z]{2,} \{$' "$caddy_file" | sed 's/ {$//')

    if [ "${#site_domains[@]}" -gt 0 ]; then
        echo "  Local Caddy sites on this box:" >&2
        local i
        for i in "${!site_domains[@]}"; do
            echo "    $((i + 1))) ${site_domains[$i]}" >&2
        done
        echo "  Or type a domain directly — including one on a different box's Caddy." >&2
    fi
    local choice=""
    prompt_text "  ${prompt_label}:" "" choice
    if [[ "$choice" =~ ^[0-9]+$ ]] && [ "$choice" -ge 1 ] && [ "$choice" -le "${#site_domains[@]}" ]; then
        echo "${site_domains[$((choice - 1))]}"
    else
        echo "$choice"
    fi
}

# Generalizes the "Protect X with Authelia SSO?" prompt individual services
# (magicmirror, wolf-pair, security-dashboard, etc.) each offer on their own
# install into one menu action here: pick any existing LOCAL Caddy site by
# number, or type a domain that's on a DIFFERENT box's Caddy entirely (this
# box only runs Authelia, not that site) — e.g. this repo's own case of a
# DigitalOcean droplet's site protected by an Authelia instance on a
# separate IONOS box.
#
# Local site: inserts "import authelia" as the very first line inside its
# existing block — must come before reverse_proxy, since Caddy runs
# directives in the order they're written and an auth check placed after
# reverse_proxy is dead code that never runs (full bypass, not an error;
# see lib/common.sh's configure_caddy_for_service for the fuller version of
# this warning). Idempotent: an already-protected site is flagged in the
# list and skips re-inserting a duplicate import, going straight to access
# scoping below.
#
# Remote site: this box can't edit a file on another machine, so it prints
# (and saves to caddy-snippets/, same convention as every other remote-
# Authelia caller in this repo) the forward_auth block that box's OWN
# Caddyfile needs instead — the remote-hop-safe form with a literal
# X-Forwarded-Host, not the {host} placeholder, for the header-rewrite
# reasons documented at length in CLAUDE.md and services/asterisk.sh.
#
# Either way, finishes by offering _authelia_scope_access for the domain —
# identical either way, since it only cares about the domain, not which box
# is actually enforcing the gate.
_authelia_protect_site() {
    local authelia_dir="$DOCKER_DIR/authelia"
    local config_file="$authelia_dir/config/configuration.yml"
    local caddy_file="$DOCKER_DIR/caddy/Caddyfile"

    if [ ! -f "$config_file" ]; then
        log_warning "No configuration.yml found at $config_file — install Authelia first."
        return 1
    fi

    local -a site_domains
    if [ -f "$caddy_file" ]; then
        mapfile -t site_domains < <(grep -oE '^[A-Za-z0-9][A-Za-z0-9.-]*\.[A-Za-z]{2,} \{$' "$caddy_file" | sed 's/ {$//')
    fi

    echo ""
    echo "  Protect a site with this Authelia instance."
    if [ "${#site_domains[@]}" -gt 0 ]; then
        echo "  Local Caddy sites on this box:"
        local i d marker
        for i in "${!site_domains[@]}"; do
            d="${site_domains[$i]}"
            marker=""
            sed -n "/^${d} {\$/,/^}/p" "$caddy_file" | grep -qE 'import authelia|forward_auth' && marker=" (already protected)"
            echo "    $((i + 1))) ${d}${marker}"
        done
    else
        echo "  No local Caddy sites found."
    fi
    echo "  Or type a domain directly — including one on a DIFFERENT box's Caddy"
    echo "  entirely (this box only needs to run Authelia itself for that to work)."
    echo "  0 to cancel."
    echo ""
    local choice=""
    prompt_text "  Number, domain, or 0 [0]:" "0" choice
    if [ -z "$choice" ] || [ "$choice" = "0" ]; then
        log_info "Cancelled — nothing changed."
        return 0
    fi

    local target_domain="" is_local=false
    if [[ "$choice" =~ ^[0-9]+$ ]] && [ "$choice" -ge 1 ] && [ "$choice" -le "${#site_domains[@]}" ]; then
        target_domain="${site_domains[$((choice - 1))]}"
        is_local=true
    else
        target_domain="$choice"
        [ -f "$caddy_file" ] && grep -qx "${target_domain} {" "$caddy_file" 2>/dev/null && is_local=true
    fi

    if [ "$is_local" = true ]; then
        if sed -n "/^${target_domain} {\$/,/^}/p" "$caddy_file" | grep -qE 'import authelia|forward_auth'; then
            log_info "${target_domain} is already protected — moving on to access scoping."
        else
            cp "$caddy_file" "$caddy_file.backup.$(date +%Y%m%d-%H%M%S)"
            sed -i "/^${target_domain} {\$/a\\    import authelia" "$caddy_file"
            log_success "Inserted 'import authelia' into ${target_domain}'s Caddy block."
            docker exec caddy caddy fmt --overwrite /etc/caddy/Caddyfile 2>/dev/null || true
            if docker ps --format '{{.Names}}' 2>/dev/null | grep -q "^caddy$"; then
                if docker exec -w /etc/caddy caddy caddy reload 2>/dev/null; then
                    log_success "Caddy reloaded"
                elif docker restart caddy &>/dev/null; then
                    log_success "Caddy restarted (reload API is disabled by default)"
                else
                    log_warning "Reload/restart failed — check: docker logs caddy"
                fi
            fi
        fi
    else
        # This instance's own portal — read back from the primary apex's
        # session.cookies entry (the first one; same read-back pattern
        # every other caller in this file uses). A domain on a different
        # box isn't "added" to this instance the way add_authelia_domain's
        # apex domains are — it's just gated by THIS instance's existing
        # portal, same as any local site above, so there's no per-domain
        # cookie entry of its own to read from.
        local portal_domain
        portal_domain="$(tr -d '\r' < "$config_file" | awk '/^  cookies:$/{f=1; next} f && /authelia_url:/{print $2; exit}' | sed -E 's#^https?://##')"
        if [ -z "$portal_domain" ]; then
            log_warning "Couldn't determine this instance's own portal domain from $config_file — aborting."
            return 1
        fi
        echo ""
        log_info "${target_domain} isn't on this box's own Caddy — add this to the OTHER box's"
        log_info "Caddyfile instead (the one that actually serves ${target_domain}), BEFORE reverse_proxy:"
        echo ""
        echo "    forward_auth https://${portal_domain} {"
        echo "        uri /api/authz/forward-auth"
        echo "        copy_headers Remote-User Remote-Groups Remote-Name Remote-Email"
        echo "        header_up X-Forwarded-Method {method}"
        echo "        header_up X-Forwarded-Proto {scheme}"
        echo "        header_up X-Forwarded-Host ${target_domain}"
        echo "        header_up X-Forwarded-Uri {uri}"
        echo "    }"
        echo ""
        log_warning "Must come BEFORE reverse_proxy in that block, not after — Caddy runs"
        log_warning "directives in the order they're written, and an auth check placed after"
        log_warning "reverse_proxy never runs at all (full bypass, not an error)."
        local snippet_dir="$DOCKER_DIR/caddy-snippets"
        mkdir -p "$snippet_dir"
        cat > "$snippet_dir/${target_domain}-authelia.caddy" << SNIPPET
    forward_auth https://${portal_domain} {
        uri /api/authz/forward-auth
        copy_headers Remote-User Remote-Groups Remote-Name Remote-Email
        header_up X-Forwarded-Method {method}
        header_up X-Forwarded-Proto {scheme}
        header_up X-Forwarded-Host ${target_domain}
        header_up X-Forwarded-Uri {uri}
    }
SNIPPET
        chown "$ACTUAL_USER:$ACTUAL_USER" "$snippet_dir/${target_domain}-authelia.caddy" 2>/dev/null || true
        log_success "Also saved: $snippet_dir/${target_domain}-authelia.caddy"
    fi

    _authelia_scope_access "$(echo "$target_domain" | tr '.' '-')" "$target_domain"
}

# Reverse of _authelia_protect_site — removes a local site's "import
# authelia" line from its own Caddy block (reloading Caddy), and the two
# access_control.rules entries _authelia_scope_access may have added for
# it, if any (found by the same "<domain-with-dots-as-hyphens>-only" group
# name _authelia_protect_site used). Each scoped rule is a 3-line
# "- domain: ...\n  subject: ...\n  policy: ..." block — bounded removal by
# buffering exactly 3 lines at a time from each "    - domain:" line and
# only dropping the buffer if the group's subject line is inside it, so an
# unrelated rule sharing the same "*.<apex>" domain line for a DIFFERENT
# group is untouched.
#
# Does NOT remove the user group itself from users.yml (a user's ["x-only"]
# membership with no matching rule left is inert, not a live grant) or
# touch a domain on a different box's Caddy (nothing here can edit that
# file) — for a remote site, this only cleans up the access rules on this
# side; removing the forward_auth block itself is a manual edit on the box
# that actually serves it.
_authelia_unprotect_site() {
    local authelia_dir="$DOCKER_DIR/authelia"
    local config_file="$authelia_dir/config/configuration.yml"
    local caddy_file="$DOCKER_DIR/caddy/Caddyfile"

    if [ ! -f "$config_file" ]; then
        log_warning "No configuration.yml found at $config_file — install Authelia first."
        return 1
    fi

    local -a protected_domains
    if [ -f "$caddy_file" ]; then
        mapfile -t protected_domains < <(
            grep -oE '^[A-Za-z0-9][A-Za-z0-9.-]*\.[A-Za-z]{2,} \{$' "$caddy_file" | sed 's/ {$//' |
            while read -r d; do
                sed -n "/^${d} {\$/,/^}/p" "$caddy_file" | grep -qE 'import authelia|forward_auth' && echo "$d"
            done
        )
    fi

    echo ""
    echo "  Un-protect a site (remove its Authelia gate)."
    if [ "${#protected_domains[@]}" -gt 0 ]; then
        echo "  Currently-protected local Caddy sites:"
        local i
        for i in "${!protected_domains[@]}"; do
            echo "    $((i + 1))) ${protected_domains[$i]}"
        done
    else
        echo "  No locally-gated Caddy sites found."
    fi
    echo "  Or type a domain directly — including one on a different box's Caddy, to"
    echo "  clean up its access-scoping rules here even though the gate itself lives"
    echo "  elsewhere and needs removing there by hand."
    echo "  0 to cancel."
    echo ""
    local choice=""
    prompt_text "  Number, domain, or 0 [0]:" "0" choice
    if [ -z "$choice" ] || [ "$choice" = "0" ]; then
        log_info "Cancelled — nothing changed."
        return 0
    fi

    local target_domain="" is_local=false
    if [[ "$choice" =~ ^[0-9]+$ ]] && [ "$choice" -ge 1 ] && [ "$choice" -le "${#protected_domains[@]}" ]; then
        target_domain="${protected_domains[$((choice - 1))]}"
        is_local=true
    else
        target_domain="$choice"
        [ -f "$caddy_file" ] && grep -qx "${target_domain} {" "$caddy_file" 2>/dev/null && is_local=true
    fi

    if [ "$is_local" = true ]; then
        if sed -n "/^${target_domain} {\$/,/^}/p" "$caddy_file" | grep -qE 'import authelia|forward_auth'; then
            cp "$caddy_file" "$caddy_file.backup.$(date +%Y%m%d-%H%M%S)"
            sed -i "/^${target_domain} {\$/,/^}/{/^ *import authelia\$/d; /^ *forward_auth /,/^ *}\$/d}" "$caddy_file"
            log_success "Removed the Authelia gate from ${target_domain}'s Caddy block."
            docker exec caddy caddy fmt --overwrite /etc/caddy/Caddyfile 2>/dev/null || true
            if docker ps --format '{{.Names}}' 2>/dev/null | grep -q "^caddy$"; then
                if docker exec -w /etc/caddy caddy caddy reload 2>/dev/null; then
                    log_success "Caddy reloaded"
                elif docker restart caddy &>/dev/null; then
                    log_success "Caddy restarted (reload API is disabled by default)"
                else
                    log_warning "Reload/restart failed — check: docker logs caddy"
                fi
            fi
        else
            log_info "${target_domain} isn't currently gated — nothing to remove there."
        fi
    else
        log_info "${target_domain} isn't on this box's own Caddy — only cleaning up its access"
        log_info "rules here. Remove the forward_auth block from the box that actually serves"
        log_info "it yourself (see $DOCKER_DIR/caddy-snippets/ if it was added via option 9)."
    fi

    local group="$(echo "$target_domain" | tr '.' '-')-only"
    if grep -qF "subject: \"group:${group}\"" "$config_file" 2>/dev/null; then
        awk -v grp="\"group:${group}\"" '
            BEGIN { buf=""; n=0; hit=0 }
            /^    - domain:/ {
                if (n > 0) { if (!hit) printf "%s", buf; buf=""; n=0; hit=0 }
                buf = $0 "\n"; n=1
                if ($0 ~ grp) hit=1
                next
            }
            n > 0 && n < 3 {
                buf = buf $0 "\n"; n++
                if ($0 ~ grp) hit=1
                if (n == 3) { if (!hit) printf "%s", buf; buf=""; n=0; hit=0 }
                next
            }
            { if (n > 0) { if (!hit) printf "%s", buf; buf=""; n=0; hit=0 } print }
            END { if (n > 0 && !hit) printf "%s", buf }
        ' "$config_file" > "$config_file.tmp" && mv "$config_file.tmp" "$config_file"
        chown 1000:1000 "$config_file" 2>/dev/null || true
        log_success "Removed the '${group}' access-scoping rules — ${target_domain} is open to any"
        log_success "Authelia user again (users' membership in '${group}' is left as harmless"
        log_success "unused metadata — remove it by hand in users.yml if you want it fully gone)."
    fi

    local RESTART_AUTH=""
    prompt_yn "  Restart Authelia to apply? (y/n):" "y" RESTART_AUTH
    if [ "$RESTART_AUTH" = "y" ] || [ "$RESTART_AUTH" = "Y" ]; then
        (cd "$authelia_dir" && docker compose restart authelia 2>/dev/null) \
            && log_success "Authelia restarted" \
            || log_warning "Restart failed — check: docker compose logs authelia"
    fi
}

# Picks "count" random characters from "charset" using an unbiased-enough
# per-byte modulo draw from /dev/urandom. Not part of lib/common.sh's shared
# generate_password (that one is deliberately alphanumeric-only — see its
# paired validate_password, which rejects special characters outright, since
# plenty of other services embed its output directly into .env/YAML/URLs
# without escaping). This one is scoped to add_authelia_user()'s temp
# password only, which is never written to disk in plaintext, so the wider
# character set is safe here without becoming a repo-wide convention change.
_authelia_rand_chars() {
    local charset="$1" count="$2" out="" idx byte clen
    clen=${#charset}
    while [ "${#out}" -lt "$count" ]; do
        byte=$(od -An -N1 -tu1 /dev/urandom | tr -d ' ')
        idx=$(( byte % clen ))
        out+="${charset:idx:1}"
    done
    printf '%s' "$out"
}

# 30 chars, at least 5 each of uppercase/digit/special, rest a random mix —
# then shuffled so the guaranteed characters aren't clustered at the front.
_authelia_gen_temp_password() {
    local length=30 min_upper=5 min_digit=5 min_special=5
    local upper_set="ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    local digit_set="0123456789"
    local special_set='!@#%^&*()_+=-[]{}:,.?~'
    local mixed_set="abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789${special_set}"

    local part_upper part_digit part_special part_rest
    part_upper="$(_authelia_rand_chars "$upper_set" "$min_upper")"
    part_digit="$(_authelia_rand_chars "$digit_set" "$min_digit")"
    part_special="$(_authelia_rand_chars "$special_set" "$min_special")"
    local rest_len=$(( length - min_upper - min_digit - min_special ))
    part_rest="$(_authelia_rand_chars "$mixed_set" "$rest_len")"

    printf '%s%s%s%s' "$part_upper" "$part_digit" "$part_special" "$part_rest" \
        | fold -w1 | shuf | tr -d '\n'
}

# Adds a new user to an EXISTING Authelia instance's users.yml — the scripted
# version of the manual "generate a hash, paste a users.yml block, restart"
# steps this file's own generated README already documents. Non-destructive:
# only inserts a new block under the existing "users:" key, never touches any
# other user already there. Any user added here can authenticate against
# every OIDC client already registered on this instance (see
# _authelia_add_oidc_client below) — Authelia's authorization_policy controls
# required auth strength (1FA/2FA), not which users may use a given client,
# so there's no separate "grant access to this app" step needed.
add_authelia_user() {
    local AUTHELIA_DIR="$DOCKER_DIR/authelia"
    local USERS_FILE="$AUTHELIA_DIR/config/users.yml"

    if [ ! -f "$USERS_FILE" ]; then
        log_warning "No users.yml found at $USERS_FILE — install Authelia first."
        return 1
    fi

    echo ""
    echo "  Add a new user to this Authelia instance."
    echo "  They log in with their username (not email). A temporary password"
    echo "  is generated below — hand it to them directly. \"Forgot Password\""
    echo "  and Authelia's own Settings → Change Password both require working"
    echo "  SMTP (both email a one-time code), so until that's fixed, use this"
    echo "  menu's \"Edit an existing user\" → \"Reset password\" for future resets."
    echo ""
    local NEW_USERNAME="" NEW_DISPLAY="" NEW_EMAIL="" NEW_ADMIN=""
    prompt_text "  Username (lowercase, no spaces):" "" NEW_USERNAME
    NEW_USERNAME="$(echo "$NEW_USERNAME" | tr -cs 'a-zA-Z0-9_-' '-' | sed 's/^-*//;s/-*$//')"
    if [ -z "$NEW_USERNAME" ]; then
        log_warning "No username entered — nothing to do."
        return 0
    fi
    if grep -qE "^  ${NEW_USERNAME}:$" "$USERS_FILE" 2>/dev/null; then
        log_warning "A user named '$NEW_USERNAME' already exists in $USERS_FILE — pick another username, or edit that entry by hand."
        return 0
    fi

    prompt_text "  Display name:" "$NEW_USERNAME" NEW_DISPLAY
    prompt_text "  Email:" "${NEW_USERNAME}@${SITE_DOMAIN:-example.com}" NEW_EMAIL
    local NEW_ADMIN_YN=""
    prompt_yn "  Grant admin group membership too? (y/n):" "n" NEW_ADMIN_YN

    log_info "Generating temporary password + hash..."
    local TEMP_PASS NEW_HASH
    TEMP_PASS="$(_authelia_gen_temp_password)"
    NEW_HASH=$(docker run --rm authelia/authelia:4.39.20 \
        authelia crypto hash generate argon2 --password "$TEMP_PASS" 2>/dev/null \
        | grep -oP '(?<=Digest: ).*')
    if [ -z "$NEW_HASH" ]; then
        log_warning "Couldn't generate the password hash automatically. Run manually, then add the"
        log_warning "user to $USERS_FILE by hand:"
        echo "    docker run --rm authelia/authelia:4.39.20 authelia crypto hash generate argon2 --password 'temporary-password'"
        return 1
    fi

    local GROUPS_BLOCK="      - users"
    [[ "$NEW_ADMIN_YN" =~ ^[Yy]$ ]] && GROUPS_BLOCK="      - admins
      - users"

    local USER_BLOCK="  ${NEW_USERNAME}:
    displayname: \"${NEW_DISPLAY}\"
    email: ${NEW_EMAIL}
    password: \"${NEW_HASH}\"
    groups:
${GROUPS_BLOCK}"

    awk -v block="$USER_BLOCK" '
        { print }
        /^users:$/ && !done { print block; done=1 }
    ' "$USERS_FILE" > "$USERS_FILE.tmp" && mv "$USERS_FILE.tmp" "$USERS_FILE"
    chown 1000:1000 "$USERS_FILE" 2>/dev/null || true
    log_success "Added user '$NEW_USERNAME' to $USERS_FILE"

    local RESTART_AUTH=""
    prompt_yn "  Restart Authelia to apply the new user? (y/n):" "y" RESTART_AUTH
    if [ "$RESTART_AUTH" = "y" ] || [ "$RESTART_AUTH" = "Y" ]; then
        (cd "$AUTHELIA_DIR" && docker compose restart authelia 2>/dev/null) \
            && log_success "Authelia restarted" \
            || log_warning "Restart failed — check: docker compose logs authelia"
    fi

    echo ""
    echo "  New user:      ${NEW_USERNAME}"
    echo "  Temp password: ${TEMP_PASS}"
    echo "  Give this to them directly (it's shown once, nothing stores it in"
    echo "  plaintext). They can log in with it as-is and keep using it, or"
    echo "  change it themselves from Authelia's Settings page — but that page"
    echo "  emails a one-time code to confirm the change, so it needs working"
    echo "  SMTP. Without SMTP, use this menu's \"Edit an existing user\" →"
    echo "  \"Reset password\" instead — that one never touches email."
    echo ""
}

# ── edit_authelia_user() helpers ──────────────────────────────────────────────
# All of these operate on a caller-supplied line range or file, never scan the
# whole file themselves, so an edit to one user's block can't bleed into a
# neighboring user (or, for the 2FA-exempt helpers, one user's exemption rule
# can't be mistaken for another's — verified against multi-user/multi-domain
# fixtures before this shipped, since a bad access_control edit here would
# break every protected domain on the instance, not just this one user).

_authelia_list_usernames() {
    local users_file="$1"
    awk '/^users:$/{f=1; next} f && /^  [A-Za-z0-9_-]+:$/{gsub(/^  /,""); gsub(/:$/,""); print}' "$users_file"
}

# Prints "<start_line> <end_line>" (1-indexed, inclusive) spanning just the
# given user's block in users.yml.
_authelia_user_line_range() {
    local users_file="$1" username="$2"
    awk -v user="$username" '
        BEGIN{start=0; end=0}
        /^  [A-Za-z0-9_-]+:$/ {
            if (start>0 && end==0) { end=NR-1 }
            if ($0 ~ "^  "user":$") { start=NR }
        }
        END {
            if (start>0 && end==0) { end=NR }
            print start, end
        }
    ' "$users_file"
}

# Replaces the first "    <field>: ..." line found within [start,end] with
# "newline" verbatim (caller supplies correct quoting for that field).
_authelia_set_user_field() {
    local users_file="$1" start="$2" end="$3" field="$4" newline="$5"
    awk -v s="$start" -v e="$end" -v field="$field" -v newline="$newline" '
        NR>=s && NR<=e && $0 ~ "^    "field":" { print newline; next }
        { print }
    ' "$users_file" > "$users_file.tmp" && mv "$users_file.tmp" "$users_file"
}

# enable=true adds "- admins" under this user's groups: (no-op if already
# present); enable=false removes it. Scoped to [start,end] so it can't touch
# another user's groups list.
_authelia_toggle_admin() {
    local users_file="$1" start="$2" end="$3" enable="$4"
    if [ "$enable" = "true" ]; then
        if ! sed -n "${start},${end}p" "$users_file" | grep -q '^      - admins$'; then
            awk -v s="$start" -v e="$end" '
                { print }
                NR>=s && NR<=e && /^    groups:$/ { print "      - admins" }
            ' "$users_file" > "$users_file.tmp" && mv "$users_file.tmp" "$users_file"
        fi
    else
        awk -v s="$start" -v e="$end" '
            NR>=s && NR<=e && /^      - admins$/ { next }
            { print }
        ' "$users_file" > "$users_file.tmp" && mv "$users_file.tmp" "$users_file"
    fi
}

# Deletes a user's whole block (their [start,end] line range, as returned by
# _authelia_user_line_range) from users.yml. Doesn't touch access_control.rules
# or any "<service>-only" group definition elsewhere — deleting the user's own
# block is enough, since group membership only ever lived inside it.
_authelia_delete_user_block() {
    local users_file="$1" start="$2" end="$3"
    awk -v s="$start" -v e="$end" 'NR<s || NR>e' "$users_file" > "$users_file.tmp" && mv "$users_file.tmp" "$users_file"
}

# Every "<service>-only" group that exists anywhere in users.yml, deduplicated —
# i.e. every service someone has already scoped access to via
# _authelia_scope_access. Used to offer a numbered pick-list instead of asking
# for a group name to be typed.
_authelia_list_scoped_groups() {
    local users_file="$1"
    grep -oE '^      - [a-zA-Z0-9_-]+-only$' "$users_file" 2>/dev/null | sed 's/^      - //' | sort -u
}

# Same shape as _authelia_toggle_admin but for an arbitrary group name —
# used to scope a user's access to a single service (see
# _authelia_scope_access below) rather than the fixed "admins" group.
_authelia_toggle_group() {
    local users_file="$1" start="$2" end="$3" group="$4" enable="$5"
    if [ "$enable" = "true" ]; then
        if ! sed -n "${start},${end}p" "$users_file" | grep -qF "      - ${group}"; then
            awk -v s="$start" -v e="$end" -v grp="      - ${group}" '
                { print }
                NR>=s && NR<=e && /^    groups:$/ { print grp }
            ' "$users_file" > "$users_file.tmp" && mv "$users_file.tmp" "$users_file"
        fi
    else
        awk -v s="$start" -v e="$end" -v grpline="      - ${group}" '
            NR>=s && NR<=e && $0==grpline { next }
            { print }
        ' "$users_file" > "$users_file.tmp" && mv "$users_file.tmp" "$users_file"
    fi
}

# Non-interactive core of add_authelia_user() below — no prompts, takes
# everything as args, generates a temp password + hash, and writes the user
# block directly into an arbitrary extra group (not just "users"). Used by
# _authelia_scope_access() to create users on the fly when someone lists a
# username that doesn't exist yet. Deliberately a separate function rather
# than a refactor of add_authelia_user() itself — that one's already in
# regular use via the interactive menu and this repo's convention is to
# extract a non-interactive core only when a second caller actually needs
# it (see _authelia_provision_oidc_client for the same reasoning), which
# keeps this addition low-risk to the existing, working function.
#
# Args: USERNAME DISPLAY EMAIL GROUP
# Out-param (not `local`): AUTHELIA_NEW_USER_TEMP_PASSWORD
# Returns 1 if the user already exists or hash generation fails.
_authelia_create_user_noninteractive() {
    local username="$1" display="$2" email="$3" group="$4"
    local users_file="$DOCKER_DIR/authelia/config/users.yml"

    AUTHELIA_NEW_USER_TEMP_PASSWORD=""

    if grep -qE "^  ${username}:$" "$users_file" 2>/dev/null; then
        log_warning "'$username' already exists in $users_file."
        return 1
    fi

    local temp_pass new_hash
    temp_pass="$(_authelia_gen_temp_password)"
    new_hash=$(docker run --rm authelia/authelia:4.39.20 \
        authelia crypto hash generate argon2 --password "$temp_pass" 2>/dev/null \
        | grep -oP '(?<=Digest: ).*')
    if [ -z "$new_hash" ]; then
        log_warning "Couldn't generate a password hash for '$username' automatically."
        return 1
    fi

    local user_block="  ${username}:
    displayname: \"${display}\"
    email: ${email}
    password: \"${new_hash}\"
    groups:
      - ${group}"

    awk -v block="$user_block" '
        { print }
        /^users:$/ && !done { print block; done=1 }
    ' "$users_file" > "$users_file.tmp" && mv "$users_file.tmp" "$users_file"
    chown 1000:1000 "$users_file" 2>/dev/null || true

    AUTHELIA_NEW_USER_TEMP_PASSWORD="$temp_pass"
    log_success "Created user '$username' (group: $group)"
    return 0
}

# Reusable by ANY service, after it's already been protected by Authelia —
# forward_auth gate or native OIDC alike, since this only cares about the
# domain, not the gating mechanism. Asks whether access to $DOMAIN should be
# open to any Authelia user (today's only behavior, before this existed) or
# scoped to a specific list. If scoped: creates a dedicated group named
# "<service_id>-only", adds every listed username to it (creating any that
# don't exist yet via _authelia_create_user_noninteractive), and inserts two
# access_control rules ABOVE the general catch-all — allow this group on
# $DOMAIN, deny this group on every other protected domain on the instance —
# so members can reach ONLY this one domain. Idempotent: reruns against a
# domain that's already scoped just report the existing group instead of
# duplicating rules.
#
# Idempotent: makes sure a "subject: group:admins" rule exists for $domain's
# access_control.rules, above every other rule for that domain, then returns
# the 1-indexed line number its "policy:" line ended up on (via ADMIN_BYPASS_LINE,
# not stdout — awk already uses stdout for the rewritten file). Callers that
# insert a NEW rule for this domain (_authelia_scope_access's deny-elsewhere
# rule in particular) must insert it AFTER that line, never at the literal
# top of "rules:" — Authelia takes the first matching rule, so a deny rule
# landing above the admin-bypass rule would catch an admin who's also (by
# mistake, or by some future feature) a member of the group being denied.
# install_authelia and add_authelia_domain both bake this rule in directly
# at creation time instead of calling this — it's for retrofitting an apex
# domain that predates this (see _authelia_ensure_admin_access_everywhere,
# the menu-driven bulk version of this for an existing install) and for
# _authelia_scope_access's own just-in-time safety net.
_authelia_ensure_admin_bypass() {
    local config_file="$1" domain="$2"
    ADMIN_BYPASS_LINE=""
    ADMIN_BYPASS_ADDED="false"

    local result
    result="$(awk -v domain="$domain" '
        { lines[NR] = $0 }
        END {
            for (i = 1; i < NR; i++) {
                if (lines[i] == "    - domain: \"*." domain "\"" && lines[i+1] == "      subject: \"group:admins\"") {
                    print i + 2
                    exit
                }
            }
        }
    ' "$config_file")"

    if [ -n "$result" ]; then
        ADMIN_BYPASS_LINE="$result"
        return 0
    fi

    ADMIN_BYPASS_ADDED="true"
    awk -v domain="$domain" '
        { print }
        /^  rules:$/ && !done {
            print "    - domain: \"*." domain "\""
            print "      subject: \"group:admins\""
            print "      policy: two_factor"
            done=1
        }
    ' "$config_file" > "$config_file.tmp" && mv "$config_file.tmp" "$config_file"
    chown 1000:1000 "$config_file" 2>/dev/null || true

    # The block we just inserted is always lines 2-4 counting from "  rules:"
    # (which awk just placed the block right after) — but simplest and least
    # fragile is to just re-run the same lookup now that it exists.
    ADMIN_BYPASS_LINE="$(awk -v domain="$domain" '
        { lines[NR] = $0 }
        END {
            for (i = 1; i < NR; i++) {
                if (lines[i] == "    - domain: \"*." domain "\"" && lines[i+1] == "      subject: \"group:admins\"") {
                    print i + 2
                    exit
                }
            }
        }
    ' "$config_file")"
}

# Args: SERVICE_ID DOMAIN
#
# service_id is only ever used as the SUGGESTED group name when creating a
# brand-new group — the actual group is whatever the user picks or types
# below, so the same group (e.g. "customer1-only") can be attached to
# several different sites over time instead of getting a fresh
# "<service_id>-only" group every call. The "-only" suffix itself is kept
# internally (never shown to the user, who just sees "customer1") because
# it's load-bearing elsewhere: _authelia_list_scoped_groups,
# _authelia_report_access_scope, edit_authelia_user's per-user group
# toggle, and _authelia_unprotect_site's cleanup all already key off that
# exact suffix pattern to find "this is a site-scoping group, not some
# other group a user happens to be in" — dropping it would mean touching
# all four of those instead of just this one function.
_authelia_scope_access() {
    local service_id="$1" domain="$2"
    local authelia_dir="$DOCKER_DIR/authelia"
    local config_file="$authelia_dir/config/configuration.yml"
    local users_file="$authelia_dir/config/users.yml"

    [ -f "$config_file" ] || return 0

    echo ""
    echo "  Who should be able to reach $domain via Authelia?"
    echo "    0) Internal — your own users, no extra restriction (default — same"
    echo "       access as everything else)"
    echo "    1) Outside access — a named group of specific users only"
    local scope_choice=""
    prompt_text "  Choice [0 for internal, 1 for outside access]:" "0" scope_choice
    [ "$scope_choice" = "1" ] || return 0

    local -a existing_groups
    mapfile -t existing_groups < <(_authelia_list_scoped_groups "$users_file")
    local group="" is_new_group="true" i
    if [ "${#existing_groups[@]}" -gt 0 ]; then
        echo "  Existing outside-access groups:"
        for i in "${!existing_groups[@]}"; do
            echo "    $((i + 1))) ${existing_groups[$i]%-only}"
        done
        echo "  Pick a number to add $domain to one of these, or type a new group"
        echo "  name (e.g. \"customer1\") to create one."
    else
        echo "  No outside-access groups exist yet — type a name to create one"
        echo "  (e.g. \"customer1\")."
    fi
    local group_choice=""
    prompt_text "  Group:" "${service_id}" group_choice
    if [ -z "$group_choice" ]; then
        log_warning "No group entered — leaving $domain open to all Authelia users."
        return 0
    fi
    if [[ "$group_choice" =~ ^[0-9]+$ ]] && [ "$group_choice" -ge 1 ] && [ "$group_choice" -le "${#existing_groups[@]}" ]; then
        group="${existing_groups[$((group_choice - 1))]}"
        is_new_group="false"
    else
        local clean_name
        clean_name="$(echo "$group_choice" | tr -cs 'a-zA-Z0-9_-' '-' | sed 's/^-*//;s/-*$//')"
        if [ -z "$clean_name" ]; then
            log_warning "Invalid group name — leaving $domain open to all Authelia users."
            return 0
        fi
        group="${clean_name}-only"
        for i in "${existing_groups[@]}"; do
            [ "$i" = "$group" ] && is_new_group="false"
        done
    fi

    if grep -A1 -F "    - domain: \"${domain}\"" "$config_file" 2>/dev/null | grep -qF "      subject: \"group:${group}\""; then
        log_info "$domain is already scoped to group '${group%-only}'."
        log_info "Manage its members via this menu's \"Edit an existing user\" (toggle their groups by hand in users.yml), or the universal-access report below."
        return 0
    fi

    local -a usernames
    if [ "$is_new_group" = "false" ]; then
        log_info "Reusing existing group '${group%-only}' — its current members already have access."
        local add_more=""
        prompt_yn "  Add more users to '${group%-only}' now? (y/n):" "n" add_more
        if [[ ! "$add_more" =~ ^[Yy]$ ]]; then
            usernames=()
        fi
    fi

    if [ "$is_new_group" = "true" ] || [[ "${add_more:-}" =~ ^[Yy]$ ]]; then
        local -a existing_users
        mapfile -t existing_users < <(_authelia_list_usernames "$users_file")
        if [ "${#existing_users[@]}" -gt 0 ]; then
            echo "  Existing Authelia users:"
            for i in "${!existing_users[@]}"; do
                echo "    $((i + 1))) ${existing_users[$i]}"
            done
            echo "  Pick by number (space-separated), and/or type new usernames directly"
            echo "  to create them — mix freely, e.g. \"1 3 newperson\"."
        else
            echo "  No existing Authelia users yet — type usernames below to create them fresh."
        fi
        echo "  Anyone typed (not picked by number) who doesn't already have an"
        echo "  Authelia account gets one created — you'll get their temporary"
        echo "  password to hand over."
        local raw_users=""
        prompt_text "  Usernames/numbers:" "" raw_users
        local -a raw_tokens
        read -ra raw_tokens <<< "$raw_users"
        if [ "${#raw_tokens[@]}" -eq 0 ] && [ "$is_new_group" = "true" ]; then
            log_warning "No usernames entered — leaving $domain open to all Authelia users."
            return 0
        fi
        local t
        for t in "${raw_tokens[@]}"; do
            if [[ "$t" =~ ^[0-9]+$ ]] && [ "$t" -ge 1 ] && [ "$t" -le "${#existing_users[@]}" ]; then
                usernames+=("${existing_users[$((t - 1))]}")
            else
                usernames+=("$t")
            fi
        done
    fi

    local u start_end start end
    for u in "${usernames[@]}"; do
        u="$(echo "$u" | tr -cs 'a-zA-Z0-9_-' '-' | sed 's/^-*//;s/-*$//')"
        [ -z "$u" ] && continue
        if grep -qE "^  ${u}:$" "$users_file" 2>/dev/null; then
            start_end="$(_authelia_user_line_range "$users_file" "$u")"
            start="${start_end% *}"; end="${start_end#* }"
            _authelia_toggle_group "$users_file" "$start" "$end" "$group" "true"
            log_success "Added '$u' to group '${group%-only}'"
        else
            local email_default="${u}@${SITE_DOMAIN:-example.com}"
            if _authelia_create_user_noninteractive "$u" "$u" "$email_default" "$group"; then
                echo "    Temp password for '$u': $AUTHELIA_NEW_USER_TEMP_PASSWORD"
            fi
        fi
    done

    # Two rules, both above the general catch-all: allow this group on the
    # target domain, deny this group on every other protected domain. Order
    # matters — Authelia takes the first matching rule, so both must land
    # before access_control's existing "*.${AUTHELIA_DOMAIN}" catch-all.
    local authelia_domain
    authelia_domain="$(awk '/^  cookies:$/{f=1; next} f && /domain:/{print $3; exit}' "$config_file")"

    # ...but BELOW the admin-bypass rule for this apex — otherwise the
    # deny-elsewhere rule below would outrank it, and an admin who ever ends
    # up in this group (by mistake, or a future feature) would be locked out
    # of every other domain on the instance. Ensures the bypass rule exists
    # first (retrofits it if this instance predates the feature), then
    # inserts right after it rather than at the literal top of "rules:".
    _authelia_ensure_admin_bypass "$config_file" "$authelia_domain"
    local anchor_line="$ADMIN_BYPASS_LINE"

    local scope_rules="    - domain: \"${domain}\"
      subject: \"group:${group}\"
      policy: two_factor
    - domain: \"*.${authelia_domain}\"
      subject: \"group:${group}\"
      policy: deny"

    awk -v block="$scope_rules" -v anchor="$anchor_line" '
        { print }
        anchor != "" && NR == anchor + 0 { print block }
        anchor == "" && /^  rules:$/ && !done { print block; done=1 }
    ' "$config_file" > "$config_file.tmp" && mv "$config_file.tmp" "$config_file"
    chown 1000:1000 "$config_file" 2>/dev/null || true

    local restart_auth=""
    prompt_yn "  Restart Authelia to apply this scoping? (y/n):" "y" restart_auth
    if [[ "$restart_auth" =~ ^[Yy]$ ]]; then
        (cd "$authelia_dir" && docker compose restart authelia 2>/dev/null) \
            && log_success "Authelia restarted — $domain is now restricted to group '${group%-only}'." \
            || log_warning "Restart failed — check: docker compose logs authelia"
    fi
}

# Renames an existing outside-access group everywhere it appears — every
# "subject: group:<old>" line in configuration.yml's access_control.rules,
# and every member's "- <old>" entry under their own groups: list in
# users.yml. A plain find/replace on the "-only"-suffixed internal name;
# the display name typed at the prompt (what _authelia_scope_access shows
# without the suffix) is what the user actually renames.
_authelia_rename_group() {
    local users_file="$DOCKER_DIR/authelia/config/users.yml"
    local config_file="$DOCKER_DIR/authelia/config/configuration.yml"
    [ -f "$config_file" ] || { log_warning "No configuration.yml found — install Authelia first."; return 1; }

    local -a existing_groups
    mapfile -t existing_groups < <(_authelia_list_scoped_groups "$users_file")
    if [ "${#existing_groups[@]}" -eq 0 ]; then
        log_info "No outside-access groups exist yet."
        return 0
    fi

    echo ""
    echo "  Outside-access groups:"
    local i
    for i in "${!existing_groups[@]}"; do
        echo "    $((i + 1))) ${existing_groups[$i]%-only}"
    done
    echo "    0) Cancel"
    local choice=""
    prompt_text "  Which group to rename? [0]:" "0" choice
    if ! [[ "$choice" =~ ^[0-9]+$ ]] || [ "$choice" -lt 1 ] || [ "$choice" -gt "${#existing_groups[@]}" ]; then
        log_info "Cancelled — nothing changed."
        return 0
    fi
    local old_group="${existing_groups[$((choice - 1))]}"

    local new_name=""
    prompt_text "  New name for '${old_group%-only}':" "" new_name
    local clean_name
    clean_name="$(echo "$new_name" | tr -cs 'a-zA-Z0-9_-' '-' | sed 's/^-*//;s/-*$//')"
    if [ -z "$clean_name" ]; then
        log_warning "No name entered — nothing changed."
        return 0
    fi
    local new_group="${clean_name}-only"
    if [ "$new_group" = "$old_group" ]; then
        log_info "Same name — nothing changed."
        return 0
    fi
    for i in "${existing_groups[@]}"; do
        if [ "$i" = "$new_group" ]; then
            log_warning "A group named '${clean_name}' already exists — pick a different name, or use that group directly instead of renaming into it."
            return 1
        fi
    done

    sed -i "s/subject: \"group:${old_group}\"/subject: \"group:${new_group}\"/g" "$config_file"
    sed -i "s/^      - ${old_group}\$/      - ${new_group}/g" "$users_file"
    chown 1000:1000 "$config_file" "$users_file" 2>/dev/null || true
    log_success "Renamed '${old_group%-only}' to '${clean_name}' — updated every access rule and member using it."

    local restart_auth=""
    prompt_yn "  Restart Authelia to apply? (y/n):" "y" restart_auth
    if [[ "$restart_auth" =~ ^[Yy]$ ]]; then
        (cd "$DOCKER_DIR/authelia" && docker compose restart authelia 2>/dev/null) \
            && log_success "Authelia restarted" \
            || log_warning "Restart failed — check: docker compose logs authelia"
    fi
}

# For a given group, the domains it has an actual ALLOW rule for — i.e. its
# "site membership" — as opposed to the deny-elsewhere rule
# _authelia_scope_access also writes for the same group (same subject, but
# a wildcard domain and policy: deny, which isn't a site the group can
# reach and must be excluded). Rules are always domain-line, then
# optionally a subject-line, then a policy-line, in that fixed order with
# nothing else between them — this walks the file once matching that shape
# rather than assuming fixed line-count blocks, so it works whether it's a
# 2-line (no subject) or 3-line (subject present) rule.
_authelia_group_domains() {
    local config_file="$1" group="$2"
    awk -v grp="group:${group}" '
        /^    - domain:/ { d=$0; sub(/^    - domain: /,"",d); gsub(/"/,"",d); s=""; next }
        /^      subject:/ { s=$0; next }
        /^      policy:/ { if (s ~ grp && $0 !~ /deny/) print d; d=""; s=""; next }
    ' "$config_file"
}

# Read-only overview: every outside-access group, which sites it can reach,
# and which users are in it — the "site groups" and "user groups" views
# from the AD-style mental model, in one place, since a group's site
# membership is otherwise only visible by grepping configuration.yml's
# raw rules and its user membership only by grepping users.yml.
_authelia_report_groups() {
    local users_file="$DOCKER_DIR/authelia/config/users.yml"
    local config_file="$DOCKER_DIR/authelia/config/configuration.yml"
    [ -f "$config_file" ] || { log_warning "No configuration.yml found — install Authelia first."; return 1; }

    local -a groups
    mapfile -t groups < <(_authelia_list_scoped_groups "$users_file")
    if [ "${#groups[@]}" -eq 0 ]; then
        log_info "No outside-access groups exist yet — every site is internal (open to any Authelia user, admins always included)."
        return 0
    fi

    local -a all_users
    mapfile -t all_users < <(_authelia_list_usernames "$users_file")

    echo ""
    local g u start_end start end
    for g in "${groups[@]}"; do
        echo "  ${g%-only}"

        echo "    Sites:"
        local -a domains
        mapfile -t domains < <(_authelia_group_domains "$config_file" "$g")
        if [ "${#domains[@]}" -eq 0 ]; then
            echo "      (none found — its access rule may be missing; try re-running site protection for it)"
        else
            printf '      - %s\n' "${domains[@]}"
        fi

        echo "    Users:"
        local -a members=()
        for u in "${all_users[@]}"; do
            start_end="$(_authelia_user_line_range "$users_file" "$u")"
            start="${start_end% *}"; end="${start_end#* }"
            sed -n "${start},${end}p" "$users_file" | grep -qF "      - ${g}" && members+=("$u")
        done
        if [ "${#members[@]}" -eq 0 ]; then
            echo "      (none)"
        else
            printf '      - %s\n' "${members[@]}"
        fi
        echo ""
    done
}

# Group-first complement to _authelia_manage_one_user()'s option 6 (which is
# user-first: pick a user, then toggle which groups they're in). This is the
# other direction — pick a group, then toggle which users are in it — for
# when you know which group you want to populate and don't want to visit
# each user one at a time. Same _authelia_toggle_group() underneath either
# way; this is purely a different entry point onto the same membership data.
#
# A group only exists here once it's been attached to at least one site
# (via site protection's "Outside access" choice) — Authelia has no notion
# of a group that isn't referenced by an access rule or a user's
# membership, so there's no separate "create an empty group" step; naming
# a new group during site protection is what creates it.
_authelia_manage_group_membership() {
    local users_file="$DOCKER_DIR/authelia/config/users.yml"
    local config_file="$DOCKER_DIR/authelia/config/configuration.yml"
    [ -f "$users_file" ] || { log_warning "No users.yml found — install Authelia first."; return 1; }

    local -a groups
    mapfile -t groups < <(_authelia_list_scoped_groups "$users_file")
    if [ "${#groups[@]}" -eq 0 ]; then
        log_info "No outside-access groups exist yet. A group is created the first time you"
        log_info "protect a site (option 10, or a service's own \"Add Sign in with Authelia\""
        log_info "offer) and choose \"Outside access\" instead of \"Internal\" — name it there"
        log_info "(e.g. \"customer1\"), and it'll show up here afterward to manage its members."
        return 0
    fi

    echo ""
    echo "  Outside-access groups:"
    local gi
    for gi in "${!groups[@]}"; do
        echo "    $((gi + 1))) ${groups[$gi]%-only}"
    done
    echo "    0) Cancel"
    local GROUP_CHOICE=""
    prompt_text "  Which group? [0]:" "0" GROUP_CHOICE
    if ! [[ "$GROUP_CHOICE" =~ ^[0-9]+$ ]] || [ "$GROUP_CHOICE" -lt 1 ] || [ "$GROUP_CHOICE" -gt "${#groups[@]}" ]; then
        log_info "Cancelled — nothing changed."
        return 0
    fi
    local GROUP="${groups[$((GROUP_CHOICE - 1))]}"

    local -a all_users
    mapfile -t all_users < <(_authelia_list_usernames "$users_file")
    if [ "${#all_users[@]}" -eq 0 ]; then
        log_info "No users exist yet — add one first (this menu's \"Add a new user\")."
        return 0
    fi

    echo ""
    echo "  Members of '${GROUP%-only}' (* = currently a member):"
    local ui u start_end start end member
    for ui in "${!all_users[@]}"; do
        u="${all_users[$ui]}"
        start_end="$(_authelia_user_line_range "$users_file" "$u")"
        start="${start_end% *}"; end="${start_end#* }"
        member=" "
        sed -n "${start},${end}p" "$users_file" | grep -qF "      - ${GROUP}" && member="*"
        echo "    $((ui + 1))) [${member}] ${u}"
    done
    echo ""
    echo "  Pick by number (space-separated) to toggle — a member gets removed, a"
    echo "  non-member gets added. 0 (or blank) to leave unchanged."
    local TOGGLE_SEL=""
    prompt_text "  Numbers [0]:" "0" TOGGLE_SEL
    local -a TOGGLE_TOKENS
    read -ra TOGGLE_TOKENS <<< "$TOGGLE_SEL"
    local tk tidx tu t_range t_start t_end is_member CHANGED=0
    for tk in "${TOGGLE_TOKENS[@]}"; do
        [[ "$tk" =~ ^[0-9]+$ ]] || continue
        [ "$tk" -ge 1 ] && [ "$tk" -le "${#all_users[@]}" ] || continue
        tidx=$((tk - 1))
        tu="${all_users[$tidx]}"
        # Re-resolve line range before every toggle — a prior toggle in this
        # same loop shifts every line after it (see the equivalent comment
        # in _authelia_manage_one_user's own group-toggle option).
        t_range="$(_authelia_user_line_range "$users_file" "$tu")"
        t_start="${t_range% *}"; t_end="${t_range#* }"
        is_member="false"
        sed -n "${t_start},${t_end}p" "$users_file" | grep -qF "      - ${GROUP}" && is_member="true"
        if [ "$is_member" = "true" ]; then
            _authelia_toggle_group "$users_file" "$t_start" "$t_end" "$GROUP" "false"
            log_success "Removed ${tu} from '${GROUP%-only}'"
        else
            _authelia_toggle_group "$users_file" "$t_start" "$t_end" "$GROUP" "true"
            log_success "Added ${tu} to '${GROUP%-only}'"
        fi
        CHANGED=1
    done

    if [ "$CHANGED" = "1" ]; then
        chown 1000:1000 "$users_file" 2>/dev/null || true
        local RESTART_AUTH=""
        prompt_yn "  Restart Authelia to apply? (y/n):" "y" RESTART_AUTH
        if [[ "$RESTART_AUTH" =~ ^[Yy]$ ]]; then
            (cd "$DOCKER_DIR/authelia" && docker compose restart authelia 2>/dev/null) \
                && log_success "Authelia restarted" \
                || log_warning "Restart failed — check: docker compose logs authelia"
        fi
    fi
}

# Bulk version spanning BOTH axes at once — several users, one target group,
# in a single step (e.g. "1 4 5 6 -> internal", then "2 3 7 8 -> external1"),
# repeatable for as many user/group batches as needed in one menu visit.
# Complements the two single-axis tools above: option 6 (per-user menu) is
# one user, many groups to toggle; option 16 is one group, many users to
# toggle; this is many users, one group, picked together. "Internal" isn't
# a real group — picking it clears every outside-access group membership
# for the selected users, since internal access is the absence of a
# restricting group, not a group of its own.
_authelia_bulk_assign_group() {
    local users_file="$DOCKER_DIR/authelia/config/users.yml"
    [ -f "$users_file" ] || { log_warning "No users.yml found — install Authelia first."; return 1; }

    local KEEP_GOING="y"
    while [[ "$KEEP_GOING" =~ ^[Yy]$ ]]; do
        local -a all_users
        mapfile -t all_users < <(_authelia_list_usernames "$users_file")
        if [ "${#all_users[@]}" -eq 0 ]; then
            log_info "No users exist yet — add one first (this menu's \"Add a new user\")."
            return 0
        fi

        echo ""
        echo "  Existing users:"
        local i start_end start end
        for i in "${!all_users[@]}"; do
            start_end="$(_authelia_user_line_range "$users_file" "${all_users[$i]}")"
            start="${start_end% *}"; end="${start_end#* }"
            echo "    $((i + 1))) ${all_users[$i]}  [$(_authelia_describe_user_access "$users_file" "$start" "$end")]"
        done
        echo ""
        echo "  Select one or more users by number (space-separated), or 0 to cancel."
        local USEL=""
        prompt_text "  User number(s) [0]:" "0" USEL
        if [ -z "$USEL" ] || [ "$USEL" = "0" ]; then
            log_info "Cancelled."
            return 0
        fi

        local -a usel_tokens targets=()
        read -ra usel_tokens <<< "$USEL"
        local tok
        for tok in "${usel_tokens[@]}"; do
            if [[ "$tok" =~ ^[0-9]+$ ]] && [ "$tok" -ge 1 ] && [ "$tok" -le "${#all_users[@]}" ]; then
                targets+=("${all_users[$((tok - 1))]}")
            else
                log_warning "Skipping invalid selection: $tok"
            fi
        done
        if [ "${#targets[@]}" -eq 0 ]; then
            log_warning "No valid users selected."
            prompt_yn "  Try again? (y/n):" "n" KEEP_GOING
            continue
        fi

        local -a existing_groups
        mapfile -t existing_groups < <(_authelia_list_scoped_groups "$users_file")
        echo ""
        echo "  Assign ${#targets[@]} user(s) to:"
        echo "    0) Internal — remove from every outside-access group"
        local gi
        for gi in "${!existing_groups[@]}"; do
            echo "    $((gi + 1))) ${existing_groups[$gi]%-only}"
        done
        echo "  Or type a new group name to create one."
        local GSEL=""
        prompt_text "  Group [0 for internal]:" "0" GSEL

        if [ -z "$GSEL" ] || [ "$GSEL" = "0" ]; then
            local t t_start_end t_start t_end g
            for t in "${targets[@]}"; do
                t_start_end="$(_authelia_user_line_range "$users_file" "$t")"
                t_start="${t_start_end% *}"; t_end="${t_start_end#* }"
                for g in "${existing_groups[@]}"; do
                    sed -n "${t_start},${t_end}p" "$users_file" | grep -qF "      - ${g}" \
                        && _authelia_toggle_group "$users_file" "$t_start" "$t_end" "$g" "false"
                done
                log_success "${t} set to internal (removed from every outside-access group)"
            done
        else
            local group=""
            if [[ "$GSEL" =~ ^[0-9]+$ ]] && [ "$GSEL" -ge 1 ] && [ "$GSEL" -le "${#existing_groups[@]}" ]; then
                group="${existing_groups[$((GSEL - 1))]}"
            else
                local clean_name
                clean_name="$(echo "$GSEL" | tr -cs 'a-zA-Z0-9_-' '-' | sed 's/^-*//;s/-*$//')"
                if [ -z "$clean_name" ]; then
                    log_warning "Invalid group name — nothing changed."
                    prompt_yn "  Try again? (y/n):" "n" KEEP_GOING
                    continue
                fi
                group="${clean_name}-only"
                local is_new="true" eg
                for eg in "${existing_groups[@]}"; do [ "$eg" = "$group" ] && is_new="false"; done
                if [ "$is_new" = "true" ]; then
                    log_warning "'$clean_name' isn't attached to any site yet — membership alone won't grant"
                    log_warning "access to anything until a site is scoped to it (site protection's"
                    log_warning "\"Outside access\" choice, or re-running a service's own SSO offer)."
                fi
            fi
            local t t_start_end2 t_start2 t_end2
            for t in "${targets[@]}"; do
                t_start_end2="$(_authelia_user_line_range "$users_file" "$t")"
                t_start2="${t_start_end2% *}"; t_end2="${t_start_end2#* }"
                _authelia_toggle_group "$users_file" "$t_start2" "$t_end2" "$group" "true"
                log_success "Added ${t} to '${group%-only}'"
            done
        fi

        chown 1000:1000 "$users_file" 2>/dev/null || true
        local RESTART_AUTH=""
        prompt_yn "  Restart Authelia to apply? (y/n):" "y" RESTART_AUTH
        if [[ "$RESTART_AUTH" =~ ^[Yy]$ ]]; then
            (cd "$DOCKER_DIR/authelia" && docker compose restart authelia 2>/dev/null) \
                && log_success "Authelia restarted" \
                || log_warning "Restart failed — check: docker compose logs authelia"
        fi

        echo ""
        prompt_yn "  Assign another batch (different users and/or a different group)? (y/n):" "n" KEEP_GOING
    done
}

# Menu-driven, idempotent bulk version of _authelia_ensure_admin_bypass —
# backfills the admin-bypass rule for every apex domain currently on this
# instance in one pass. install_authelia and add_authelia_domain bake the
# rule in automatically for anything created from here on, and
# _authelia_scope_access retrofits it just-in-time for whichever domain it's
# scoping — this is for catching every OTHER domain an install already had
# before this feature existed (or just double-checking one that's fine).
# Safe to re-run any time; only touches domains actually missing the rule.
_authelia_ensure_admin_access_everywhere() {
    local config_file="$DOCKER_DIR/authelia/config/configuration.yml"
    [ -f "$config_file" ] || { log_warning "No configuration.yml found — install Authelia first."; return 1; }

    local -a apex_domains
    mapfile -t apex_domains < <(grep -oE '^    - domain: "\*\.[^"]+"' "$config_file" | sed -E 's/^    - domain: "\*\.(.+)"$/\1/' | awk '!seen[$0]++')

    if [ "${#apex_domains[@]}" -eq 0 ]; then
        log_info "No apex domains found on this instance."
        return 0
    fi

    echo ""
    echo "  Checking the admin-bypass rule for every domain on this instance:"
    local d any_added="false"
    for d in "${apex_domains[@]}"; do
        _authelia_ensure_admin_bypass "$config_file" "$d"
        if [ "$ADMIN_BYPASS_ADDED" = "true" ]; then
            echo "    ${d} — added"
            any_added="true"
        else
            echo "    ${d} — already present"
        fi
    done

    if [ "$any_added" = "false" ]; then
        log_success "Every domain already had it — nothing to change."
        return 0
    fi

    log_success "Members of the 'admins' group now always have access to every domain"
    log_success "listed above, regardless of any per-service scoping already in place —"
    log_success "or added later, since _authelia_scope_access checks for this automatically"
    log_success "from now on."
    log_warning "Make sure your admin account(s) are actually in the 'admins' group in"
    log_warning "config/users.yml — the default admin created at install time already is."

    local restart_auth=""
    prompt_yn "  Restart Authelia to apply? (y/n):" "y" restart_auth
    if [[ "$restart_auth" =~ ^[Yy]$ ]]; then
        (cd "$DOCKER_DIR/authelia" && docker compose restart authelia 2>/dev/null) \
            && log_success "Authelia restarted" \
            || log_warning "Restart failed — check: docker compose logs authelia"
    fi
}

# Reporting/management: lists which users have "universal" access (every
# protected domain — anyone not locked into a "<service>-only" group) versus
# which are scoped to specific services, then offers to promote a scoped
# user to universal by removing them from all their "-only" groups. Doesn't
# touch access_control.rules at all — universal access is just the absence
# of a restricting group, so "promoting" someone is purely a users.yml edit.
_authelia_report_access_scope() {
    local users_file="$DOCKER_DIR/authelia/config/users.yml"
    [ -f "$users_file" ] || { log_warning "No users.yml found — install Authelia first."; return 1; }

    local -a all_users
    mapfile -t all_users < <(_authelia_list_usernames "$users_file")
    if [ "${#all_users[@]}" -eq 0 ]; then
        log_warning "No users found in $users_file."
        return 0
    fi

    echo ""
    echo "  Internal (universal — every protected domain, no outside-access group):"
    local -a universal=() restricted=()
    local u start_end start end groups_in_range
    for u in "${all_users[@]}"; do
        start_end="$(_authelia_user_line_range "$users_file" "$u")"
        start="${start_end% *}"; end="${start_end#* }"
        groups_in_range="$(sed -n "${start},${end}p" "$users_file" | grep -oE '\- [a-z0-9_-]+-only$' | sed 's/^- //')"
        if [ -z "$groups_in_range" ]; then
            universal+=("$u")
            echo "    - $u"
        else
            restricted+=("$u ($(echo "$groups_in_range" | tr '\n' ',' | sed 's/,$//'))")
        fi
    done
    [ "${#universal[@]}" -eq 0 ] && echo "    (none)"

    echo ""
    echo "  Outside access (limited to a named group):"
    if [ "${#restricted[@]}" -eq 0 ]; then
        echo "    (none)"
    else
        printf '    - %s\n' "${restricted[@]}"
    fi

    echo ""
    local promote=""
    prompt_yn "  Promote a scoped user to universal access? (y/n):" "n" promote
    [[ "$promote" =~ ^[Yy]$ ]] || return 0

    local target=""
    prompt_text "  Username to promote:" "" target
    [ -z "$target" ] && return 0
    if ! grep -qE "^  ${target}:$" "$users_file" 2>/dev/null; then
        log_warning "'$target' not found in $users_file."
        return 0
    fi

    start_end="$(_authelia_user_line_range "$users_file" "$target")"
    start="${start_end% *}"; end="${start_end#* }"
    local -a target_groups
    mapfile -t target_groups < <(sed -n "${start},${end}p" "$users_file" | grep -oE '\- [a-z0-9_-]+-only$' | sed 's/^- //')
    if [ "${#target_groups[@]}" -eq 0 ]; then
        log_info "'$target' already has universal access."
        return 0
    fi
    local g
    for g in "${target_groups[@]}"; do
        _authelia_toggle_group "$users_file" "$start" "$end" "$g" "false"
    done
    log_success "'$target' removed from: ${target_groups[*]} — now has universal access."

    local restart_auth=""
    prompt_yn "  Restart Authelia to apply? (y/n):" "y" restart_auth
    if [[ "$restart_auth" =~ ^[Yy]$ ]]; then
        (cd "$DOCKER_DIR/authelia" && docker compose restart authelia 2>/dev/null) \
            && log_success "Authelia restarted" \
            || log_warning "Restart failed — check: docker compose logs authelia"
    fi
}

# Changes how long an Authelia session lasts when a user checks "Remember
# me" at login — the actual mechanism behind "log in once, don't get asked
# again for a long time" for every domain this instance protects.
#
# The config key is `remember_me` (plain, under session:), NOT
# `remember_me_duration` — that name was retired in Authelia 4.38, this
# repo pins 4.39.20. Confirmed against Authelia's own docs/changelog
# before writing this; an easy mistake since older guidance (including an
# earlier version of this very file's own README section) uses the old
# name, which Authelia would just silently ignore rather than error on.
#
# This only controls AUTHELIA's own session — it does not touch how long
# a native-OIDC app's (Gitea/Mealie/ActualBudget) own session/token lasts
# after logging in via Authelia. A long remember_me makes re-authenticating
# to Authelia itself instant/silent whenever one of those apps' own
# session expires and sends you back through the OIDC flow, but doesn't
# stop that app's own session from expiring on its own separate schedule.
_authelia_set_remember_me() {
    local config_file="$DOCKER_DIR/authelia/config/configuration.yml"
    [ -f "$config_file" ] || { log_warning "No configuration.yml found — install Authelia first."; return 1; }

    local current
    current="$(grep -E '^  remember_me:' "$config_file" | awk '{print $2}' | tr -d "'\"")"
    echo ""
    echo "  Current \"remember me\" duration: ${current:-not set}"
    echo "  How long a session lasts when someone checks \"Remember me\" at login —"
    echo "  applies to every domain this Authelia instance protects."
    echo "  Examples: 12h, 7d, 1M (month), 1y. Set to -1 to disable Remember Me entirely."
    local new_duration=""
    prompt_text "  New duration [${current:-7d}]:" "${current:-7d}" new_duration
    if [ -z "$new_duration" ] || [ "$new_duration" = "$current" ]; then
        log_info "No change made."
        return 0
    fi

    if grep -qE '^  remember_me:' "$config_file"; then
        sed -i "s/^  remember_me:.*/  remember_me: '${new_duration}'/" "$config_file"
    else
        sed -i "/^session:\$/a\\  remember_me: '${new_duration}'" "$config_file"
    fi
    chown 1000:1000 "$config_file" 2>/dev/null || true
    log_success "\"Remember me\" duration set to ${new_duration}."

    local restart_auth=""
    prompt_yn "  Restart Authelia to apply? (y/n):" "y" restart_auth
    if [[ "$restart_auth" =~ ^[Yy]$ ]]; then
        (cd "$DOCKER_DIR/authelia" && docker compose restart authelia 2>/dev/null) \
            && log_success "Authelia restarted" \
            || log_warning "Restart failed — check: docker compose logs authelia"
    fi

    echo ""
    log_info "Takes effect for NEW logins where \"Remember me\" is checked at Authelia's"
    log_info "login page — existing sessions keep whatever expiration they already had."
    log_info "The checkbox itself is already on the login form by default; this only"
    log_info "changes how long checking it actually keeps you signed in."
}

# Export/import accounts (+ optionally 2FA/session state) — for migrating to
# a fresh instance or restoring after a reinstall without losing accounts or
# forcing everyone to re-enroll 2FA. Passwords are never exported as
# plaintext — Authelia only ever stores an argon2id hash — but that hash is
# fully portable: dropping it into another instance's users.yml (same
# hashing settings, which this repo's installer always uses) makes the
# original password keep working, no reset required.
#
# TOTP secrets inside data/db.sqlite3 are AES-encrypted with this instance's
# own storage encryption key (config/secrets/storage_secret) — NOT with
# anything derived from the password. install_authelia's fresh-install path
# generates a brand-new storage_secret every time (openssl rand -hex 32,
# same as jwt_secret/session_secret), so a db.sqlite3 copied onto an
# instance with a different storage_secret has 2FA data Authelia can't
# decrypt. Export/import both carry storage_secret alongside db.sqlite3 so a
# "remove and recreate" round-trip (export, reinstall, import) keeps 2FA
# working — session_secret/jwt_secret don't need to match (only sign
# cookies / password-reset links, safe to rotate) so those are left alone.
_authelia_export_import_users_menu() {
    local authelia_dir="$DOCKER_DIR/authelia"
    [ -f "$authelia_dir/config/users.yml" ] || { log_warning "No users.yml found — install Authelia first."; return 1; }

    echo ""
    echo "  Export/import user data"
    echo "    1) Export (users.yml + 2FA/session data) to a backup folder"
    echo "    2) Import from a previous export (overwrites current users)"
    echo "    0) Back"
    local choice=""
    prompt_text "  Choice [1-2, 0 to go back]:" "0" choice
    case "$choice" in
        1) _authelia_export_users ;;
        2) _authelia_import_users ;;
        0|*) return 0 ;;
    esac
}

_authelia_export_users() {
    local authelia_dir="$DOCKER_DIR/authelia"
    local users_file="$authelia_dir/config/users.yml"
    local db_file="$authelia_dir/data/db.sqlite3"
    local storage_secret_file="$authelia_dir/config/secrets/storage_secret"

    local default_dest="${ACTUAL_HOME:-$HOME}/authelia-export-$(date +%Y%m%d)"
    local dest=""
    prompt_text "  Export to which directory? [${default_dest}]:" "$default_dest" dest
    [ -z "$dest" ] && dest="$default_dest"

    if [ "$DRY_RUN" = true ]; then
        echo "[DRY-RUN] Would export $users_file, $db_file, and $storage_secret_file to $dest"
        return 0
    fi

    mkdir -p "$dest"
    cp "$users_file" "$dest/users.yml"

    local exported_2fa="no"
    if [ -f "$db_file" ] && [ -f "$storage_secret_file" ]; then
        cp "$db_file" "$dest/db.sqlite3"
        cp "$storage_secret_file" "$dest/storage_secret"
        exported_2fa="yes"
    fi

    # Readable summary alongside the raw file — username / display name /
    # email / groups, no password hash — handy to eyeball or hand off
    # without pasting the full users.yml.
    awk '
        /^  [a-zA-Z0-9_-]+:$/ { if (u) print u, "|", d, "|", e, "|", g; u=$1; sub(":","",u); d=""; e=""; g="" }
        /^    displayname:/  { d=$0; sub(/^    displayname: */,"",d) }
        /^    email:/        { e=$0; sub(/^    email: */,"",e) }
        /^      - /          { line=$0; gsub(/^      - /,"",line); g = g line "," }
        END { if (u) print u, "|", d, "|", e, "|", g }
    ' "$users_file" > "$dest/users-summary.txt"

    chown -R "${ACTUAL_USER:-$(id -un)}:${ACTUAL_USER:-$(id -un)}" "$dest" 2>/dev/null || true
    chmod 600 "$dest/users.yml" "$dest/storage_secret" 2>/dev/null || true

    log_success "Exported to $dest"
    echo "    users.yml           — full account data incl. password hashes (portable, works as-is on import)"
    if [ "$exported_2fa" = "yes" ]; then
        echo "    db.sqlite3          — 2FA/TOTP registrations + session storage"
        echo "    storage_secret      — required alongside db.sqlite3 to decrypt the 2FA data (keep this file private)"
    else
        log_warning "    No data/db.sqlite3 or secrets/storage_secret found — 2FA registrations were NOT exported. Users will need to re-enroll 2FA after an import."
    fi
    echo "    users-summary.txt   — readable username/displayname/email/groups list, no password hash"
}

_authelia_import_users() {
    local authelia_dir="$DOCKER_DIR/authelia"
    local users_file="$authelia_dir/config/users.yml"
    local db_file="$authelia_dir/data/db.sqlite3"
    local storage_secret_file="$authelia_dir/config/secrets/storage_secret"

    local src=""
    prompt_text "  Import from which directory (containing users.yml)?:" "" src
    [ -z "$src" ] && { log_info "Cancelled — nothing changed."; return 0; }
    src="${src%/}"

    if [ ! -f "$src/users.yml" ]; then
        log_warning "No users.yml found in $src — nothing to import."
        return 1
    fi

    if [ "$DRY_RUN" = true ]; then
        echo "[DRY-RUN] Would replace $users_file with $src/users.yml"
        [ -f "$src/db.sqlite3" ] && echo "[DRY-RUN] Would replace $db_file and $storage_secret_file with the exported copies"
        return 0
    fi

    local ts
    ts="$(date +%Y%m%d-%H%M%S)"
    [ -f "$users_file" ] && cp "$users_file" "$users_file.bak.$ts"

    cp "$src/users.yml" "$users_file"
    chown 1000:1000 "$users_file"
    log_success "Imported users.yml (previous version backed up to $(basename "$users_file").bak.$ts)"

    if [ -f "$src/db.sqlite3" ] && [ -f "$src/storage_secret" ]; then
        local import_db=""
        prompt_yn "  Also import 2FA/session data (db.sqlite3 + storage_secret) — restores everyone's existing TOTP enrollment instead of forcing a re-scan? (y/n):" "y" import_db
        if [[ "$import_db" =~ ^[Yy]$ ]]; then
            [ -f "$db_file" ] && cp "$db_file" "$db_file.bak.$ts"
            [ -f "$storage_secret_file" ] && cp "$storage_secret_file" "$storage_secret_file.bak.$ts"
            cp "$src/db.sqlite3" "$db_file"
            cp "$src/storage_secret" "$storage_secret_file"
            chown 1000:1000 "$db_file" "$storage_secret_file"
            chmod 600 "$storage_secret_file"
            log_success "Imported db.sqlite3 + storage_secret (previous versions backed up alongside them)."
            log_warning "storage_secret must match what encrypted this db.sqlite3 — don't import one without the other, or 2FA data becomes undecryptable."
        fi
    elif [ -f "$src/db.sqlite3" ] || [ -f "$src/storage_secret" ]; then
        log_warning "Found only one of db.sqlite3 / storage_secret in $src — need both together to safely restore 2FA data, so skipping. Imported users will need to re-enroll 2FA on first login."
    else
        log_info "No 2FA/session export found in $src — imported users will need to re-enroll 2FA on first login."
    fi

    local restart_auth=""
    prompt_yn "  Restart Authelia to apply? (y/n):" "y" restart_auth
    if [[ "$restart_auth" =~ ^[Yy]$ ]]; then
        (cd "$authelia_dir" && docker compose restart authelia 2>/dev/null) \
            && log_success "Authelia restarted" \
            || log_warning "Restart failed — check: docker compose logs authelia"
    fi
}

# action="exempt": inserts a "policy: one_factor / subject: user:<name>" rule
# immediately before EVERY plain "policy: two_factor" catch-all domain rule in
# configuration.yml (handles multi-domain instances from add_authelia_domain
# automatically). action="restore": removes only this user's own such rules,
# leaving any other user's exemptions and the catch-all rules untouched.
# Caller is responsible for the idempotency check (only offer "exempt" in the
# menu when not already exempt, and vice versa) — this helper doesn't dedupe.
_authelia_set_2fa_exempt() {
    local config_file="$1" username="$2" action="$3"
    if [ "$action" = "exempt" ]; then
        awk -v user="$username" '
            { lines[NR]=$0 }
            END {
                for (i=1; i<=NR; i++) {
                    if (lines[i] ~ /^    - domain:/ && lines[i+1] ~ /policy: two_factor/) {
                        domain = lines[i]
                        sub(/^    - domain: /, "", domain)
                        print "    - domain: " domain
                        print "      policy: one_factor"
                        print "      subject: \"user:" user "\""
                    }
                    print lines[i]
                }
            }
        ' "$config_file" > "$config_file.tmp" && mv "$config_file.tmp" "$config_file"
    else
        awk -v user="$username" '
            { lines[NR]=$0 }
            END {
                for (i=1; i<=NR; i++) {
                    if (lines[i] ~ /^    - domain:/ && lines[i+1] ~ /policy: one_factor/ && lines[i+2] ~ ("subject: \"user:" user "\"")) {
                        i += 2
                        continue
                    }
                    print lines[i]
                }
            }
        ' "$config_file" > "$config_file.tmp" && mv "$config_file.tmp" "$config_file"
    fi
    chown 1000:1000 "$config_file" 2>/dev/null || true
}

# One-line access summary for a user, e.g. "admin" / "internal" /
# "customer1, customer2" / "admin, customer1" — used by both
# edit_authelia_user()'s listing and _authelia_bulk_assign_group() so a
# user's current privileges are visible right where you're about to change
# them, not something you have to cross-check against option 15 first.
_authelia_describe_user_access() {
    local users_file="$1" start="$2" end="$3"
    local -a tags=()
    sed -n "${start},${end}p" "$users_file" | grep -q '^      - admins$' && tags+=("admin")
    local -a groups
    mapfile -t groups < <(sed -n "${start},${end}p" "$users_file" | grep -oE '^      - [a-zA-Z0-9_-]+-only$' | sed 's/^      - //; s/-only$//')
    tags+=("${groups[@]}")
    [ "${#tags[@]}" -eq 0 ] && tags=("internal")
    local IFS=", "
    echo "${tags[*]}"
}

# Interactive: pick an existing user from users.yml, then act on them —
# edit email/display name, force a password reset, reset their 2FA device,
# toggle whether they need 2FA at all, or toggle admin group membership.
# Loops so multiple actions can be applied to the same user in one pass.
edit_authelia_user() {
    local AUTHELIA_DIR="$DOCKER_DIR/authelia"
    local USERS_FILE="$AUTHELIA_DIR/config/users.yml"
    local CONFIG_FILE="$AUTHELIA_DIR/config/configuration.yml"

    if [ ! -f "$USERS_FILE" ]; then
        log_warning "No users.yml found at $USERS_FILE — install Authelia first."
        return 1
    fi

    # Outer loop: pick one or more users by number, act on each in turn (via
    # _authelia_manage_one_user below), then ask whether to go again — so
    # deleting/editing several users doesn't require re-running the whole
    # script and re-navigating this menu from scratch for every single one.
    local KEEP_GOING="y"
    while [[ "$KEEP_GOING" =~ ^[Yy]$ ]]; do
        local -a USERNAMES
        mapfile -t USERNAMES < <(_authelia_list_usernames "$USERS_FILE")
        if [ "${#USERNAMES[@]}" -eq 0 ]; then
            log_warning "No users left in $USERS_FILE."
            return 0
        fi

        echo ""
        echo "  Existing users:"
        local i u_start_end u_start u_end
        for i in "${!USERNAMES[@]}"; do
            u_start_end="$(_authelia_user_line_range "$USERS_FILE" "${USERNAMES[$i]}")"
            u_start="${u_start_end% *}"; u_end="${u_start_end#* }"
            echo "    $((i + 1))) ${USERNAMES[$i]}  [$(_authelia_describe_user_access "$USERS_FILE" "$u_start" "$u_end")]"
        done
        echo ""
        echo "  Select one or more by number (space-separated, e.g. \"2 4\"),"
        echo "  or 0 to cancel."
        local SEL=""
        prompt_text "  User number(s) [0]:" "0" SEL
        if [ -z "$SEL" ] || [ "$SEL" = "0" ]; then
            log_info "Cancelled."
            return 0
        fi

        local -a SEL_TOKENS TARGETS=()
        read -ra SEL_TOKENS <<< "$SEL"
        local tok
        for tok in "${SEL_TOKENS[@]}"; do
            if [[ "$tok" =~ ^[0-9]+$ ]] && [ "$tok" -ge 1 ] && [ "$tok" -le "${#USERNAMES[@]}" ]; then
                TARGETS+=("${USERNAMES[$((tok - 1))]}")
            else
                log_warning "Skipping invalid selection: $tok"
            fi
        done

        local TARGET
        for TARGET in "${TARGETS[@]}"; do
            # A user picked earlier in this same batch may have just been
            # deleted (or this number was picked twice) — re-check before
            # acting instead of operating on a now-stale line range.
            grep -qE "^  ${TARGET}:$" "$USERS_FILE" 2>/dev/null || { log_info "'$TARGET' no longer exists — skipping."; continue; }
            _authelia_manage_one_user "$TARGET" "$USERS_FILE" "$CONFIG_FILE" "$AUTHELIA_DIR"
        done

        echo ""
        prompt_yn "  Manage more users? (y/n):" "n" KEEP_GOING
    done
}

# Per-user action menu (edit/reset-password/2FA/admin/service-access/delete),
# extracted out of edit_authelia_user() so its caller can drive it once per
# selected user across a multi-user batch instead of only ever handling one
# user per script invocation.
_authelia_manage_one_user() {
    local TARGET="$1" USERS_FILE="$2" CONFIG_FILE="$3" AUTHELIA_DIR="$4"

    local CONTINUE="y"
    while [[ "$CONTINUE" =~ ^[Yy]$ ]]; do
        local RANGE START END DELETED=0
        RANGE="$(_authelia_user_line_range "$USERS_FILE" "$TARGET")"
        START="${RANGE% *}"; END="${RANGE#* }"

        local IS_ADMIN="no"
        sed -n "${START},${END}p" "$USERS_FILE" | grep -q '^      - admins$' && IS_ADMIN="yes"
        local IS_EXEMPT="no"
        [ -f "$CONFIG_FILE" ] && grep -qF "subject: \"user:${TARGET}\"" "$CONFIG_FILE" && IS_EXEMPT="yes"

        echo ""
        echo "  Editing user: $TARGET   (admin: $IS_ADMIN, 2FA-exempt: $IS_EXEMPT)"
        echo "    1) Edit email / display name"
        echo "    2) Reset password"
        echo "    3) Reset 2FA device (they register a new one on next login)"
        if [ "$IS_EXEMPT" = "yes" ]; then
            echo "    4) Restore the 2FA requirement for this user"
        else
            echo "    4) Exempt this user from 2FA (one_factor only — weakens their account)"
        fi
        if [ "$IS_ADMIN" = "yes" ]; then
            echo "    5) Demote from admin"
        else
            echo "    5) Promote to admin"
        fi
        echo "    6) Promote to (or remove from) a specific service's access group"
        echo "    7) Delete this user"
        echo "    0) Done with this user"
        echo ""
        local ACTION=""
        prompt_text "  Choice [1-7, 0 when done]:" "0" ACTION

        case "$ACTION" in
            1)
                local CUR_EMAIL CUR_DISPLAY NEW_EMAIL NEW_DISPLAY
                CUR_EMAIL="$(sed -n "${START},${END}p" "$USERS_FILE" | grep '^    email:' | sed 's/^    email: *//')"
                CUR_DISPLAY="$(sed -n "${START},${END}p" "$USERS_FILE" | grep '^    displayname:' | sed 's/^    displayname: *//; s/^"//; s/"$//')"
                prompt_text "  New email [$CUR_EMAIL]:" "$CUR_EMAIL" NEW_EMAIL
                prompt_text "  New display name [$CUR_DISPLAY]:" "$CUR_DISPLAY" NEW_DISPLAY
                _authelia_set_user_field "$USERS_FILE" "$START" "$END" "email" "    email: ${NEW_EMAIL}"
                _authelia_set_user_field "$USERS_FILE" "$START" "$END" "displayname" "    displayname: \"${NEW_DISPLAY}\""
                chown 1000:1000 "$USERS_FILE" 2>/dev/null || true
                log_success "Updated $TARGET's email/display name."
                ;;
            2)
                log_info "Generating a new temporary password + hash..."
                local NEW_TEMP_PASS NEW_HASH
                NEW_TEMP_PASS="$(_authelia_gen_temp_password)"
                NEW_HASH=$(docker run --rm authelia/authelia:4.39.20 \
                    authelia crypto hash generate argon2 --password "$NEW_TEMP_PASS" 2>/dev/null \
                    | grep -oP '(?<=Digest: ).*')
                if [ -z "$NEW_HASH" ]; then
                    log_warning "Couldn't generate the password hash automatically — nothing changed. Try again."
                else
                    _authelia_set_user_field "$USERS_FILE" "$START" "$END" "password" "    password: \"${NEW_HASH}\""
                    chown 1000:1000 "$USERS_FILE" 2>/dev/null || true
                    log_success "Password reset for $TARGET."
                    echo "    New password: ${NEW_TEMP_PASS}"
                    echo "    Give this to them directly — shown once, not stored in plaintext anywhere."
                fi
                ;;
            3)
                if docker ps --format '{{.Names}}' | grep -q '^authelia$'; then
                    if docker exec authelia authelia storage user totp delete "$TARGET" --config /config/configuration.yml 2>/dev/null; then
                        log_success "TOTP device reset for $TARGET — they'll register a new one on next login."
                    else
                        log_warning "No TOTP device found for $TARGET (or the delete failed) — check: docker compose logs authelia"
                    fi
                    echo "  WebAuthn devices (if any) aren't covered by this option — reset those manually with:"
                    echo "    docker exec authelia authelia storage user webauthn delete --username $TARGET --config /config/configuration.yml"
                else
                    log_warning "Authelia isn't running — start it first: cd $AUTHELIA_DIR && docker compose up -d"
                fi
                ;;
            4)
                if [ "$IS_EXEMPT" = "yes" ]; then
                    _authelia_set_2fa_exempt "$CONFIG_FILE" "$TARGET" "restore"
                    log_success "Restored the two_factor requirement for $TARGET."
                else
                    local CONFIRM_EXEMPT=""
                    prompt_yn "  $TARGET will be able to log in with just a password (no 2FA) on every domain this instance protects. Continue? (y/n):" "n" CONFIRM_EXEMPT
                    if [[ "$CONFIRM_EXEMPT" =~ ^[Yy]$ ]]; then
                        _authelia_set_2fa_exempt "$CONFIG_FILE" "$TARGET" "exempt"
                        log_success "$TARGET no longer needs 2FA (one_factor only)."
                    else
                        log_info "Left as-is."
                    fi
                fi
                ;;
            5)
                if [ "$IS_ADMIN" = "yes" ]; then
                    _authelia_toggle_admin "$USERS_FILE" "$START" "$END" "false"
                    chown 1000:1000 "$USERS_FILE" 2>/dev/null || true
                    log_success "$TARGET demoted from admin."
                else
                    _authelia_toggle_admin "$USERS_FILE" "$START" "$END" "true"
                    chown 1000:1000 "$USERS_FILE" 2>/dev/null || true
                    log_success "$TARGET promoted to admin."
                fi
                ;;
            6)
                local -a SCOPED_GROUPS
                mapfile -t SCOPED_GROUPS < <(_authelia_list_scoped_groups "$USERS_FILE")
                if [ "${#SCOPED_GROUPS[@]}" -eq 0 ]; then
                    log_info "No service-scoped access groups exist yet — every protected domain is currently open to any Authelia user. A service gets a scoped group when it's first protected with Authelia SSO and \"Specific users only\" is chosen."
                    ACTION=""
                else
                    echo ""
                    echo "  Service-scoped access groups (* = $TARGET is currently a member):"
                    local gi grp member
                    for gi in "${!SCOPED_GROUPS[@]}"; do
                        grp="${SCOPED_GROUPS[$gi]}"
                        member=" "
                        sed -n "${START},${END}p" "$USERS_FILE" | grep -qF "      - ${grp}" && member="*"
                        echo "    $((gi + 1))) [${member}] ${grp%-only}"
                    done
                    echo ""
                    echo "  Pick by number (space-separated) to toggle — a member gets removed,"
                    echo "  a non-member gets added. 0 (or blank) to leave unchanged."
                    local TOGGLE_SEL=""
                    prompt_text "  Numbers [0]:" "0" TOGGLE_SEL
                    local -a TOGGLE_TOKENS
                    read -ra TOGGLE_TOKENS <<< "$TOGGLE_SEL"
                    local tk tidx tgrp t_start t_end t_range is_member
                    for tk in "${TOGGLE_TOKENS[@]}"; do
                        [[ "$tk" =~ ^[0-9]+$ ]] || continue
                        [ "$tk" -ge 1 ] && [ "$tk" -le "${#SCOPED_GROUPS[@]}" ] || continue
                        tidx=$((tk - 1))
                        tgrp="${SCOPED_GROUPS[$tidx]}"
                        # Re-resolve the user's line range before every toggle — a prior
                        # toggle in this same loop shifts every line after it, so reusing
                        # the outer START/END here would drift after the first change.
                        t_range="$(_authelia_user_line_range "$USERS_FILE" "$TARGET")"
                        t_start="${t_range% *}"; t_end="${t_range#* }"
                        is_member="false"
                        sed -n "${t_start},${t_end}p" "$USERS_FILE" | grep -qF "      - ${tgrp}" && is_member="true"
                        if [ "$is_member" = "true" ]; then
                            _authelia_toggle_group "$USERS_FILE" "$t_start" "$t_end" "$tgrp" "false"
                            log_success "Removed $TARGET from '${tgrp}' (${tgrp%-only})"
                        else
                            _authelia_toggle_group "$USERS_FILE" "$t_start" "$t_end" "$tgrp" "true"
                            log_success "Added $TARGET to '${tgrp}' (${tgrp%-only})"
                        fi
                    done
                    chown 1000:1000 "$USERS_FILE" 2>/dev/null || true
                fi
                ;;
            7)
                echo ""
                log_warning "This permanently removes '$TARGET' from $USERS_FILE — they won't be able to log in again until re-added."
                local CONFIRM_DELETE=""
                prompt_yn "  Delete user '$TARGET'? (y/n):" "n" CONFIRM_DELETE
                if [[ "$CONFIRM_DELETE" =~ ^[Yy]$ ]]; then
                    _authelia_delete_user_block "$USERS_FILE" "$START" "$END"
                    chown 1000:1000 "$USERS_FILE" 2>/dev/null || true
                    log_success "Deleted user '$TARGET'."
                    DELETED=1
                else
                    log_info "Left as-is."
                fi
                ;;
            0|*)
                ACTION="0"
                ;;
        esac

        if [ "$DELETED" = "1" ]; then
            local RESTART_AUTH=""
            prompt_yn "  Restart Authelia to apply this change? (y/n):" "y" RESTART_AUTH
            if [ "$RESTART_AUTH" = "y" ] || [ "$RESTART_AUTH" = "Y" ]; then
                (cd "$AUTHELIA_DIR" && docker compose restart authelia 2>/dev/null) \
                    && log_success "Authelia restarted" \
                    || log_warning "Restart failed — check: docker compose logs authelia"
            fi
            CONTINUE="n"
        elif [[ "$ACTION" =~ ^[12456]$ ]]; then
            local RESTART_AUTH=""
            prompt_yn "  Restart Authelia to apply this change? (y/n):" "y" RESTART_AUTH
            if [ "$RESTART_AUTH" = "y" ] || [ "$RESTART_AUTH" = "Y" ]; then
                (cd "$AUTHELIA_DIR" && docker compose restart authelia 2>/dev/null) \
                    && log_success "Authelia restarted" \
                    || log_warning "Restart failed — check: docker compose logs authelia"
            fi
            echo ""
            prompt_yn "  Do something else with $TARGET? (y/n):" "n" CONTINUE
        else
            CONTINUE="n"
        fi
    done
}

# Enables Authelia's OIDC PROVIDER feature — a distinct thing from the
# forward_auth (proxy-auth) setup install_authelia() already does. forward_auth
# gates a whole Caddy site behind an Authelia login page before the request
# ever reaches the app; OIDC provider mode is the opposite direction — an app
# with its OWN "Enable OpenID"/SSO setting (ActualBudget, Vaultwarden, etc.)
# delegates ITS login to Authelia instead of asking a user for a
# service-specific password. Neither replaces the other; a service can use
# either, both, or neither.
#
# One-time, idempotent (checked via the identity_providers: key already being
# present) — every _authelia_add_oidc_client() call runs this first so OIDC
# just works the first time an app is registered, no separate "enable OIDC"
# step to remember.
_authelia_ensure_oidc_provider() {
    local AUTHELIA_DIR="$1"
    local CONFIG_FILE="$AUTHELIA_DIR/config/configuration.yml"
    local SECRETS_DIR="$AUTHELIA_DIR/config/secrets"

    grep -q '^identity_providers:' "$CONFIG_FILE" 2>/dev/null && return 0

    log_info "Enabling Authelia's OIDC provider (one-time — lets other apps log in via Authelia)..."

    # hmac_secret: injected via a _FILE env var in docker-compose.yml, same
    # convention as jwt/session/storage secrets above — configuration.yml
    # itself never holds this one as a raw string. "Random Value: <value>"
    # is the exact (and only) line this subcommand prints — confirmed
    # against Authelia's own CLI source, not assumed.
    local _rand_out
    _rand_out="$(docker run --rm authelia/authelia:4.39.20 \
        authelia crypto rand --length 64 --charset alphanumeric 2>/dev/null)"
    echo "${_rand_out#Random Value: }" > "$SECRETS_DIR/oidc_hmac_secret"
    if [ ! -s "$SECRETS_DIR/oidc_hmac_secret" ]; then
        log_warning "Couldn't generate the OIDC HMAC secret — skipping OIDC provider setup. Re-run to try again."
        return 1
    fi
    chmod 600 "$SECRETS_DIR/oidc_hmac_secret"

    # RSA keypair for signing OIDC tokens (jwks). Authelia's schema requires
    # the private key inlined as PEM directly in configuration.yml — no
    # file-path or _FILE-env-var option for this specific nested field
    # (confirmed against the current identity_providers.oidc.jwks schema) —
    # so this generates into config/secrets/ for safe permissions, then reads
    # it back in below. "private.pem"/"public.pem" are the CLI's own default
    # output filenames (confirmed against Authelia's CLI reference), not
    # guessed.
    docker run --rm -u "$(id -u):$(id -g)" -v "$SECRETS_DIR":/keys \
        authelia/authelia:4.39.20 authelia crypto pair rsa generate --directory /keys >/dev/null 2>&1
    if [ ! -f "$SECRETS_DIR/private.pem" ]; then
        log_warning "Couldn't generate the OIDC signing key — skipping OIDC provider setup. Re-run to try again."
        return 1
    fi
    chmod 600 "$SECRETS_DIR/private.pem" "$SECRETS_DIR/public.pem" 2>/dev/null

    {
        echo ""
        echo "identity_providers:"
        echo "  oidc:"
        echo "    jwks:"
        echo "      - key_id: 'main'"
        echo "        algorithm: 'RS256'"
        echo "        use: 'sig'"
        echo "        key: |"
        sed 's/^/          /' "$SECRETS_DIR/private.pem"
        echo "    clients: []"
    } >> "$CONFIG_FILE"

    if ! grep -q 'AUTHELIA_IDENTITY_PROVIDERS_OIDC_HMAC_SECRET_FILE' "$AUTHELIA_DIR/docker-compose.yml"; then
        sed -i '/AUTHELIA_NOTIFIER_SMTP_SENDER/a\      - AUTHELIA_IDENTITY_PROVIDERS_OIDC_HMAC_SECRET_FILE=/config/secrets/oidc_hmac_secret' \
            "$AUTHELIA_DIR/docker-compose.yml"
    fi

    chown -R 1000:1000 "$AUTHELIA_DIR/config"
    chmod 600 "$CONFIG_FILE"
    log_success "OIDC provider enabled (signing key + HMAC secret generated)"
}

# Deletes one OIDC client block (matched by client_id) from
# identity_providers.oidc.clients in configuration.yml. Used by
# _authelia_provision_oidc_client below to make re-registering a client_id
# idempotent instead of a dead end — see that function's own comment on
# why a stale registration is safe to just replace. A client block starts
# at its own "      - client_id: '<id>'" line (6-space indent) and runs
# until either the next such line or a line indented less than 6 spaces
# (end of the clients list) — deleting stops exactly there so a sibling
# client's block, or whatever config section follows, is untouched.
_authelia_remove_oidc_client() {
    local config_file="$1" client_id="$2"
    awk -v target="'${client_id}'" '
        {
            if ($0 ~ /^      - client_id: /) {
                skip = ($0 ~ target) ? 1 : 0
            } else if (skip && $0 !~ /^      /) {
                skip = 0
            }
            if (!skip) print
        }
    ' "$config_file" > "$config_file.tmp" && mv "$config_file.tmp" "$config_file"
    chown 1000:1000 "$config_file" 2>/dev/null || true
}

# Non-interactive core of _authelia_add_oidc_client() below — generates a
# client secret, patches it into identity_providers.oidc.clients, and
# (optionally) restarts Authelia. Fully self-contained (re-validates
# everything itself rather than trusting a caller's state) so other
# services can call it directly to register themselves as an OIDC client
# without walking a human through this file's own menu — see
# services/gitea.sh's "Sign in with Authelia" step for the reference caller.
# Guard every cross-file call with `declare -F` per this repo's chaining
# convention (services/gitea.sh does).
#
# Args: APP_NAME CLIENT_ID AUTH_POLICY RESTART_AUTH(y/n) REQUIRE_PKCE(y/n) EXTRA_SCOPES <redirect_uri> [<redirect_uri> ...]
#   EXTRA_SCOPES — space-separated scope names to add on top of the
#   always-included openid/profile/email (e.g. "groups" for an app whose own
#   OIDC settings request group membership, like Homebox). Pass "" when the
#   app only needs the three defaults — every existing caller before this
#   parameter was added does exactly that, so their registered client is
#   byte-for-byte unchanged.
# Out-params (not `local` — read them after the call returns):
#   OIDC_CLIENT_SECRET_PLAIN   the plaintext secret. Shown once — Authelia's
#                              config only ever stores the hash — so the
#                              caller must capture and use/display it now.
#   OIDC_AUTHELIA_DOMAIN       this Authelia instance's apex domain, for
#                              building discovery/authorization/token URLs.
#   OIDC_AUTHELIA_PORTAL_URL   the actual login-portal base URL (e.g.
#                              https://auth.example.com) — read back from this
#                              instance's own config rather than assumed,
#                              since the portal subdomain isn't always "auth."
#                              (install_authelia()/add_authelia_domain() both
#                              default to it, but it's plain text in
#                              configuration.yml and gets hand-edited on some
#                              boxes — e.g. a dedicated VPS instance renamed
#                              to "authelia." to avoid colliding with another
#                              instance's "auth." on a different machine).
#                              Use this, not a hardcoded "https://auth.$domain",
#                              when building a discovery/redirect URL for a
#                              native-OIDC app.
# Returns 1 on failure (Authelia not installed, domain undeterminable,
# secret generation failed) with the reason already logged. A client_id
# that's already registered is NOT a failure — it gets replaced (see the
# comment at that check below).
_authelia_provision_oidc_client() {
    local APP_NAME="$1" CLIENT_ID="$2" AUTH_POLICY="$3" RESTART_AUTH="$4" REQUIRE_PKCE="$5" EXTRA_SCOPES="$6"; shift 6
    local -a REDIRECT_URIS=("$@")

    OIDC_CLIENT_SECRET_PLAIN=""
    OIDC_AUTHELIA_DOMAIN=""
    OIDC_AUTHELIA_PORTAL_URL=""

    local AUTHELIA_DIR="$DOCKER_DIR/authelia"
    local CONFIG_FILE="$AUTHELIA_DIR/config/configuration.yml"

    if [ ! -f "$CONFIG_FILE" ]; then
        log_warning "No configuration.yml found at $CONFIG_FILE — install Authelia first."
        return 1
    fi

    _authelia_ensure_oidc_provider "$AUTHELIA_DIR" || return 1

    # The apex domain this Authelia instance already serves — read back from
    # its own session.cookies (same structure install_authelia()/
    # add_authelia_domain() write), rather than asking again or assuming a
    # variable set earlier in this run is still in scope (this flow can be
    # reached standalone from the "already exists" menu, or from another
    # service entirely, with none of install_authelia()'s own locals ever
    # having run this session).
    # tr -d '\r' first, not after — a CRLF-tainted config (e.g. a line
    # hand-edited by something that saves Windows line endings) makes every
    # line-anchored awk pattern below fail to match at all, not just leave a
    # stray \r in the captured value: "  cookies:\r" doesn't match
    # /^  cookies:$/ since $ anchors end-of-string and the \r is still part
    # of it. Also strip a leading/trailing quote character: these fields are
    # unquoted in every value this repo's own scripts write, but YAML makes
    # quoting optional and a hand-edited config can add single or double
    # quotes around the value. awk's `print $2`/`print $3` is a naive
    # whitespace-split token grab that doesn't know about YAML quoting, so a
    # quoted value comes back WITH the literal quote characters still
    # attached. Confirmed live: this is what actually caused a "line 12:
    # unexpected character '/' in variable name" failure in Mealie's
    # .env — an authelia_url value hand-edited to
    # `authelia_url: 'https://authelia.example.com'` got captured as the
    # literal string including both single quotes, so the generated
    # discovery URL came out `'https://authelia.example.com'/.well-known/...`
    # — Docker Compose's env parser closed the quoted value at that
    # embedded closing quote and choked on everything after it as a new,
    # invalid token. (The earlier \r-stripping guards a different,
    # also-real failure mode — a CRLF-tainted line failing to match these
    # anchored patterns at all — not this one; both are needed.)
    OIDC_AUTHELIA_DOMAIN="$(tr -d '\r' < "$CONFIG_FILE" | awk '/^  cookies:$/{f=1; next} f && /domain:/{print $3; exit}' | sed "s/^[\"']//; s/[\"']\$//")"
    if [ -z "$OIDC_AUTHELIA_DOMAIN" ]; then
        log_warning "Couldn't determine this Authelia instance's domain from $CONFIG_FILE — aborting."
        return 1
    fi

    # Read the real portal URL back from config instead of assuming the
    # "auth." prefix — see the OIDC_AUTHELIA_PORTAL_URL out-param comment
    # above for why this can't be hardcoded. Falls back to the "auth."
    # default only if parsing somehow comes up empty.
    OIDC_AUTHELIA_PORTAL_URL="$(tr -d '\r' < "$CONFIG_FILE" | awk '/^  cookies:$/{f=1; next} f && /authelia_url:/{print $2; exit}' | sed "s/^[\"']//; s/[\"']\$//")"
    [ -z "$OIDC_AUTHELIA_PORTAL_URL" ] && OIDC_AUTHELIA_PORTAL_URL="https://auth.${OIDC_AUTHELIA_DOMAIN}"

    # A stale registration (e.g. from the interactive "Register an app" menu
    # run previously without ever finishing — its plaintext secret was shown
    # once and is gone, so the registration is dead weight either way) would
    # otherwise permanently block this exact service's automated SSO offer
    # with nothing but a warning. Confirmed live: this is what happened to
    # ActualBudget the first time its own offer ran, against a client_id the
    # menu had already registered in an earlier session. Safe to just
    # replace — every automated caller here uses a fixed, service-specific
    # client_id, so a collision means "this same service, already
    # registered" rather than someone else's app using the same ID.
    if grep -qF "client_id: '${CLIENT_ID}'" "$CONFIG_FILE" 2>/dev/null; then
        log_warning "A client with ID '$CLIENT_ID' is already registered — replacing it with a fresh one (its old secret was never recoverable anyway)."
        _authelia_remove_oidc_client "$CONFIG_FILE" "$CLIENT_ID"
    fi

    log_info "Generating client secret..."
    local _hash_out CLIENT_SECRET_HASH
    _hash_out="$(docker run --rm authelia/authelia:4.39.20 \
        authelia crypto hash generate pbkdf2 --variant sha512 --random \
        --random.length 72 --random.charset rfc3986 2>/dev/null)"
    OIDC_CLIENT_SECRET_PLAIN="$(echo "$_hash_out" | sed -n 's/^Random Password: //p')"
    CLIENT_SECRET_HASH="$(echo "$_hash_out" | sed -n 's/^Digest: //p')"
    if [ -z "$OIDC_CLIENT_SECRET_PLAIN" ] || [ -z "$CLIENT_SECRET_HASH" ]; then
        log_warning "Couldn't generate the client secret automatically. Run manually, then add the"
        log_warning "client to $CONFIG_FILE's identity_providers.oidc.clients by hand:"
        echo "    docker run --rm authelia/authelia:4.39.20 authelia crypto hash generate pbkdf2 --variant sha512 --random --random.length 72 --random.charset rfc3986"
        OIDC_CLIENT_SECRET_PLAIN=""
        return 1
    fi

    grep -q '^    clients: \[\]$' "$CONFIG_FILE" && sed -i 's/^    clients: \[\]$/    clients:/' "$CONFIG_FILE"

    local REDIRECT_URIS_YAML
    REDIRECT_URIS_YAML="$(printf "          - '%s'\n" "${REDIRECT_URIS[@]}")"
    REDIRECT_URIS_YAML="${REDIRECT_URIS_YAML%$'\n'}"

    # PKCE lines are opt-in, not default — Authelia's own defaults for every
    # other field here (client_secret_basic auth method for a confidential
    # client, access_token_signed_response_alg: none) already match what
    # Audiobookshelf/Beszel's own Authelia integration docs specify, but
    # require_pkce defaults to false and has to be set explicitly for the
    # apps that need it. Checked against authelia.com's own per-client
    # integration pages for those two, not assumed — every existing caller
    # (Mealie/ActualBudget/Vaultwarden/Gitea/Immich) passes "n" here and
    # gets byte-for-byte the same client block as before this was added.
    local PKCE_YAML=""
    if [[ "$REQUIRE_PKCE" =~ ^[Yy]$ ]]; then
        PKCE_YAML="
        require_pkce: true
        pkce_challenge_method: 'S256'"
    fi

    # EXTRA_SCOPES is space-separated (e.g. "groups") and additive to the
    # three always-included scopes below — Authelia rejects a callback
    # requesting any scope not in this exact per-client allowlist, even one
    # the server otherwise supports (confirmed live: Homebox's own
    # HBOX_OIDC_SCOPE=openid profile email groups was rejected with
    # invalid_scope until 'groups' was added here too).
    local EXTRA_SCOPES_YAML=""
    local _scope
    for _scope in $EXTRA_SCOPES; do
        EXTRA_SCOPES_YAML="${EXTRA_SCOPES_YAML}
          - '${_scope}'"
    done

    local CLIENT_BLOCK="      - client_id: '${CLIENT_ID}'
        client_name: '${APP_NAME}'
        client_secret: '${CLIENT_SECRET_HASH}'
        public: false
        authorization_policy: '${AUTH_POLICY}'${PKCE_YAML}
        redirect_uris:
${REDIRECT_URIS_YAML}
        scopes:
          - 'openid'
          - 'profile'
          - 'email'${EXTRA_SCOPES_YAML}
        grant_types:
          - 'authorization_code'
        response_types:
          - 'code'
        response_modes:
          - 'query'
        userinfo_signed_response_alg: 'none'"

    awk -v block="$CLIENT_BLOCK" '
        { print }
        /^    clients:$/ && !done { print block; done=1 }
    ' "$CONFIG_FILE" > "$CONFIG_FILE.tmp" && mv "$CONFIG_FILE.tmp" "$CONFIG_FILE"
    chown 1000:1000 "$CONFIG_FILE" 2>/dev/null || true

    if [[ "$RESTART_AUTH" =~ ^[Yy]$ ]]; then
        (cd "$AUTHELIA_DIR" && docker compose restart authelia 2>/dev/null) \
            && log_success "Authelia restarted" \
            || log_warning "Authelia restart failed — check: docker compose logs authelia"
    fi
    return 0
}

# Registers an OIDC client for another app to log in via Authelia — the
# "Other" provider option in an app's own "Enable OpenID"/SSO dialog. Presets
# below hand back the app's own known redirect URI path and the exact fields
# to paste where; "Other/custom" covers anything not listed (the app's own
# OIDC/SSO docs will say what redirect URI it expects). Interactive wrapper
# around _authelia_provision_oidc_client() above, which does the actual work.
_authelia_add_oidc_client() {
    local AUTHELIA_DIR="$DOCKER_DIR/authelia"
    local CONFIG_FILE="$AUTHELIA_DIR/config/configuration.yml"

    if [ ! -f "$CONFIG_FILE" ]; then
        log_warning "No configuration.yml found at $CONFIG_FILE — install Authelia first."
        return 1
    fi

    # The apex domain this Authelia instance already serves — read back from
    # its own session.cookies (same structure install_authelia()/
    # add_authelia_domain() write), rather than asking again or assuming a
    # variable set earlier in this run is still in scope (this flow can be
    # reached standalone from the "already exists" menu with none of
    # install_authelia()'s own locals ever having run this session). Used
    # below only to suggest a domain default — _authelia_provision_oidc_client
    # re-derives its own copy independently.
    local AUTHELIA_DOMAIN
    AUTHELIA_DOMAIN="$(tr -d '\r' < "$CONFIG_FILE" | awk '/^  cookies:$/{f=1; next} f && /domain:/{print $3; exit}' | sed "s/^[\"']//; s/[\"']\$//")"
    if [ -z "$AUTHELIA_DOMAIN" ]; then
        log_warning "Couldn't determine this Authelia instance's domain from $CONFIG_FILE — aborting."
        return 1
    fi

    # This domain's own portal — whatever subdomain was actually chosen at
    # install time (see install_authelia's own AUTHELIA_PORTAL_SUBDOMAIN
    # prompt), not necessarily "auth.<domain>". Read back the same way
    # AUTHELIA_DOMAIN itself is, from this entry's own authelia_url.
    local AUTHELIA_PORTAL_DOMAIN
    AUTHELIA_PORTAL_DOMAIN="$(tr -d '\r' < "$CONFIG_FILE" | awk -v domain="$AUTHELIA_DOMAIN" '
        $0 == "    - domain: " domain { f=1; next }
        f && /authelia_url:/ { print $2; exit }
    ' | sed -E 's#^https?://##')"
    [ -z "$AUTHELIA_PORTAL_DOMAIN" ] && AUTHELIA_PORTAL_DOMAIN="auth.${AUTHELIA_DOMAIN}"

    echo ""
    echo "  Register another app to log in via Authelia (OIDC/SSO)."
    echo ""
    echo "    1) ActualBudget"
    echo "    2) Vaultwarden"
    echo "    3) Immich (needs multiple redirect URIs — web login, account-linking,"
    echo "       and the mobile app's custom-scheme callback — all registered here)"
    echo "    5) Audiobookshelf (needs PKCE — checked against its own Authelia"
    echo "       integration docs, registered here automatically)"
    echo "    6) Beszel (PocketBase-based — also needs PKCE; its own side is"
    echo "       configured in its Settings -> Auth providers page, not an API)"
    echo "    4) Other / custom app"
    echo "    0) Cancel"
    echo ""
    local APP_CHOICE=""
    prompt_text "  Choice [1-6, 0 to cancel]:" "0" APP_CHOICE

    local APP_NAME="" CLIENT_ID="" REQUIRE_PKCE="n"
    local -a REDIRECT_PATHS=() EXTRA_REDIRECT_URIS=()
    case "$APP_CHOICE" in
        1) APP_NAME="ActualBudget"; CLIENT_ID="actualbudget"; REDIRECT_PATHS=("/openid/callback") ;;
        2) APP_NAME="Vaultwarden";  CLIENT_ID="vaultwarden";  REDIRECT_PATHS=("/identity/connect/oidc-signin") ;;
        3)
            APP_NAME="Immich"; CLIENT_ID="immich"
            REDIRECT_PATHS=("/auth/login" "/user-settings")
            EXTRA_REDIRECT_URIS=("app.immich:///oauth-callback")
            ;;
        5)
            APP_NAME="Audiobookshelf"; CLIENT_ID="audiobookshelf"; REQUIRE_PKCE="y"
            REDIRECT_PATHS=("/auth/openid/callback" "/auth/openid/mobile-redirect")
            EXTRA_REDIRECT_URIS=("audiobookshelf://oauth")
            ;;
        6)
            APP_NAME="Beszel"; CLIENT_ID="beszel"; REQUIRE_PKCE="y"
            REDIRECT_PATHS=("/api/oauth2-redirect")
            ;;
        4)
            prompt_text "  App name (for your reference):" "" APP_NAME
            [ -z "$APP_NAME" ] && { log_warning "No app name entered — nothing to do."; return 0; }
            CLIENT_ID="$(echo "$APP_NAME" | tr '[:upper:]' '[:lower:]' | tr -cs 'a-z0-9' '-' | sed 's/^-*//;s/-*$//')"
            prompt_text "  Client ID [${CLIENT_ID}]:" "$CLIENT_ID" CLIENT_ID
            echo "  Check ${APP_NAME}'s own OIDC/SSO docs for its exact redirect URI path"
            echo "  (often something like /oauth/callback, /auth/callback, /sso/callback)."
            local _redirect_path=""
            prompt_text "  Redirect URI path (starting with /):" "" _redirect_path
            [ -n "$_redirect_path" ] && REDIRECT_PATHS=("$_redirect_path")
            ;;
        0|*)
            log_info "Cancelled — nothing changed."
            return 0
            ;;
    esac
    if [ -z "$CLIENT_ID" ] || { [ "${#REDIRECT_PATHS[@]}" -eq 0 ] && [ "${#EXTRA_REDIRECT_URIS[@]}" -eq 0 ]; }; then
        log_warning "Missing client ID or redirect path — nothing to do."
        return 0
    fi

    # No duplicate-ID check here — _authelia_provision_oidc_client below
    # already handles that safely by replacing the stale registration (its
    # old secret was shown once and is unrecoverable either way, so there's
    # nothing to lose). An earlier version of this function dead-ended here
    # instead ("pick a different app, or edit by hand") before ever
    # reaching that safe path — confirmed live: this blocked re-registering
    # ActualBudget after nothing more than a first attempt, with no way
    # through except hand-editing configuration.yml.

    local APP_DOMAIN
    APP_DOMAIN="$(_authelia_pick_domain "Domain ${APP_NAME} is reachable at (number or domain)")"
    if [ -z "$APP_DOMAIN" ]; then
        log_warning "No domain entered — nothing to do."
        return 0
    fi

    # Domain-relative paths (web login, account-linking, ...) plus any
    # already-complete URIs that aren't domain-based (Immich's mobile app
    # custom-scheme callback isn't reached over https at all).
    local -a REDIRECT_URIS=()
    local _p
    for _p in "${REDIRECT_PATHS[@]}"; do
        REDIRECT_URIS+=("https://${APP_DOMAIN}${_p}")
    done
    for _p in "${EXTRA_REDIRECT_URIS[@]}"; do
        REDIRECT_URIS+=("$_p")
    done

    local _2fa="" AUTH_POLICY="two_factor"
    prompt_yn "  Require two-factor for ${APP_NAME} logins too? (y/n):" "y" _2fa
    [[ "$_2fa" =~ ^[Yy]$ ]] || AUTH_POLICY="one_factor"

    local RESTART_AUTH=""
    prompt_yn "  Restart Authelia to apply? (y/n):" "y" RESTART_AUTH

    _authelia_provision_oidc_client "$APP_NAME" "$CLIENT_ID" "$AUTH_POLICY" "$RESTART_AUTH" "$REQUIRE_PKCE" "" "${REDIRECT_URIS[@]}" \
        || return 1
    local CLIENT_SECRET_PLAIN="$OIDC_CLIENT_SECRET_PLAIN"

    echo ""
    echo "  ${APP_NAME} is registered. Paste these into its OpenID/SSO settings"
    echo "  (choose \"Other\" as the provider if it's not listed by name):"
    echo ""
    echo "    Client ID:      ${CLIENT_ID}"
    echo "    Client Secret:  ${CLIENT_SECRET_PLAIN}"
    echo "    Discovery URL:  https://${AUTHELIA_PORTAL_DOMAIN}/.well-known/openid-configuration"
    echo ""
    echo "  If it asks for individual endpoints instead of a discovery URL:"
    echo "    Authorization:  https://${AUTHELIA_PORTAL_DOMAIN}/api/oidc/authorization"
    echo "    Token:          https://${AUTHELIA_PORTAL_DOMAIN}/api/oidc/token"
    echo "    UserInfo:       https://${AUTHELIA_PORTAL_DOMAIN}/api/oidc/userinfo"
    echo "    Scopes:         openid profile email"
    echo ""
    case "$APP_CHOICE" in
        1)
            echo "  ActualBudget's \"Enable OpenID\" dialog → provider \"Other\": paste the"
            echo "  Discovery URL, Client ID, and Client Secret above."
            echo "  First OIDC login becomes the ActualBudget server owner."
            echo ""
            ;;
        2)
            echo "  Add these to Vaultwarden's .env, then: cd \$VAULTWARDEN_DIR && docker compose up -d"
            echo "    SSO_ENABLED=true"
            echo "    SSO_AUTHORITY=https://${AUTHELIA_PORTAL_DOMAIN}"
            echo "    SSO_CLIENT_ID=${CLIENT_ID}"
            echo "    SSO_CLIENT_SECRET=${CLIENT_SECRET_PLAIN}"
            echo "    SSO_SCOPES=profile email"
            echo "  Enabling SSO changes Vaultwarden's login flow for everyone on this"
            echo "  instance — see Vaultwarden's own SSO docs before turning this on for"
            echo "  a vault other people already use."
            echo ""
            ;;
        3)
            echo "  Immich → Administration → Settings → OAuth Authentication:"
            echo "    Issuer URL:     https://${AUTHELIA_PORTAL_DOMAIN}"
            echo "      (Immich appends /.well-known/openid-configuration itself — paste"
            echo "      just the base URL above, not the full Discovery URL from earlier.)"
            echo "    Client ID:      ${CLIENT_ID}"
            echo "    Client Secret:  ${CLIENT_SECRET_PLAIN}"
            echo "    Scope:          openid email profile"
            echo "  Enable OAuth login on that same settings page, then check its other"
            echo "  toggles there (auto-register new accounts, storage label claim, etc.)"
            echo "  — those are Immich-side choices this script doesn't set for you."
            echo "  Three redirect URIs were registered above: the web login, the"
            echo "  account-linking page, and the mobile app's callback — all needed"
            echo "  for OAuth to work in both the browser and the Immich mobile app."
            echo ""
            ;;
        5)
            echo "  Audiobookshelf -> Settings -> Authentication -> enable OpenID Connect"
            echo "  Authentication, then fill in (checked against audiobookshelf.org's own"
            echo "  OIDC docs — it wants individual endpoints, not a discovery URL):"
            echo "    Issuer URL:      https://${AUTHELIA_PORTAL_DOMAIN}"
            echo "    Authorize URL:   https://${AUTHELIA_PORTAL_DOMAIN}/api/oidc/authorization"
            echo "    Token URL:       https://${AUTHELIA_PORTAL_DOMAIN}/api/oidc/token"
            echo "    Userinfo URL:    https://${AUTHELIA_PORTAL_DOMAIN}/api/oidc/userinfo"
            echo "    JWKS URL:        https://${AUTHELIA_PORTAL_DOMAIN}/jwks.json"
            echo "    Client ID:       ${CLIENT_ID}"
            echo "    Client Secret:   ${CLIENT_SECRET_PLAIN}"
            echo "    Signing Algorithm: RS256"
            echo "    Allowed Mobile Redirect URIs: audiobookshelf://oauth"
            echo ""
            ;;
        6)
            echo "  Beszel is PocketBase-based — its OAuth2 provider lives in PocketBase's"
            echo "  own admin panel underneath the hub, not the hub's own Settings page and"
            echo "  not an API this script can write (checked against beszel.dev's own docs):"
            echo "    1) https://<your-beszel-domain>/_/#/settings -> toggle OFF \"Hide"
            echo "       collection create and edit controls\""
            echo "    2) Collections -> edit the \"users\" collection"
            echo "    3) Options tab -> enable OAuth2 -> Add provider, fill in:"
            echo "    Client ID:      ${CLIENT_ID}"
            echo "    Client Secret:  ${CLIENT_SECRET_PLAIN}"
            echo "    Auth URL:       https://${AUTHELIA_PORTAL_DOMAIN}/api/oidc/authorization"
            echo "    Token URL:      https://${AUTHELIA_PORTAL_DOMAIN}/api/oidc/token"
            echo "    User Info URL:  https://${AUTHELIA_PORTAL_DOMAIN}/api/oidc/userinfo"
            echo "    4) Save, then toggle \"Hide collection create and edit controls\" back"
            echo "       ON — leaving it off is its own exposure once you're done"
            echo "  Register your first Beszel account with a password BEFORE touching"
            echo "  DISABLE_PASSWORD_AUTH/USER_CREATION in its .env — flipping those before"
            echo "  a working login exists risks locking the hub's UI out entirely."
            echo ""
            ;;
    esac
    log_warning "The Client Secret above is shown once — it isn't stored in plaintext anywhere. Save it now."
}

# Interactive wrapper around _authelia_remove_oidc_client (the internal
# helper _authelia_provision_oidc_client already uses to replace a stale
# registration) — exposes it as its own menu action so removing an app's
# OIDC client doesn't require hand-editing configuration.yml either. Lists
# every registered client's ID and display name, numbered; removing one
# doesn't affect that app's own separate password login (if it has one) or
# any other client on this instance.
_authelia_remove_oidc_client_menu() {
    local AUTHELIA_DIR="$DOCKER_DIR/authelia"
    local CONFIG_FILE="$AUTHELIA_DIR/config/configuration.yml"

    if [ ! -f "$CONFIG_FILE" ]; then
        log_warning "No configuration.yml found at $CONFIG_FILE — install Authelia first."
        return 1
    fi

    local -a client_ids client_names
    mapfile -t client_ids < <(grep -oP "(?<=- client_id: ')[^']+" "$CONFIG_FILE")
    mapfile -t client_names < <(grep -oP "(?<=client_name: ')[^']+" "$CONFIG_FILE")

    if [ "${#client_ids[@]}" -eq 0 ]; then
        log_info "No OIDC clients registered on this instance."
        return 0
    fi

    echo ""
    echo "  Registered OIDC clients:"
    local i
    for i in "${!client_ids[@]}"; do
        echo "    $((i + 1))) ${client_ids[$i]} (${client_names[$i]:-unnamed})"
    done
    echo "    0) Cancel"
    echo ""
    local choice=""
    prompt_text "  Number to remove, or 0 [0]:" "0" choice
    if ! [[ "$choice" =~ ^[0-9]+$ ]] || [ "$choice" -lt 1 ] || [ "$choice" -gt "${#client_ids[@]}" ]; then
        log_info "Cancelled — nothing changed."
        return 0
    fi
    local target_id="${client_ids[$((choice - 1))]}"

    log_warning "This removes the OIDC client '${target_id}' — anyone using it to log into that app"
    log_warning "via Authelia will no longer be able to until it's re-registered (option 5). It does"
    log_warning "NOT touch that app's own separate password login, if it has one."
    local confirm=""
    prompt_yn "  Continue? (y/n):" "n" confirm
    [[ "$confirm" =~ ^[Yy]$ ]] || { log_info "Cancelled — nothing changed."; return 0; }

    _authelia_remove_oidc_client "$CONFIG_FILE" "$target_id"
    log_success "Removed OIDC client '${target_id}'."

    local RESTART_AUTH=""
    prompt_yn "  Restart Authelia to apply? (y/n):" "y" RESTART_AUTH
    if [ "$RESTART_AUTH" = "y" ] || [ "$RESTART_AUTH" = "Y" ]; then
        (cd "$AUTHELIA_DIR" && docker compose restart authelia 2>/dev/null) \
            && log_success "Authelia restarted" \
            || log_warning "Restart failed — check: docker compose logs authelia"
    fi
}

# Run immediately when executed directly (deferred until after function definition)
[[ "${_RUN_STANDALONE:-0}" == 1 ]] && install_authelia