#!/bin/bash
# services/audiobookshelf.sh — Audiobook & podcast server (Audiobookshelf).
# Part of the modular post-install system (sourced by setup.sh).
#
# Can also be run standalone on any machine:
#   sudo bash audiobookshelf.sh
# (Docker must already be installed when run standalone)
#
# Ported from ubuntu-post-install-24.04-crowdsec.sh (# ---- AUDIOBOOKSHELF ----).
# Own ~/docker/audiobookshelf/ with a standalone docker-compose.yml + .env.

# ── Standalone bootstrap ──────────────────────────────────────────────────────
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 "$_COMMON" ]]; then
        source "$_COMMON"
    else
        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'"
        }

        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

    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() { :; }
    _RUN_STANDALONE=1
fi
# ─────────────────────────────────────────────────────────────────────────────

register_service audiobookshelf media "Audiobook & podcast server (Audiobookshelf)" 13378

# Offers to register Audiobookshelf as an Authelia OIDC client and prints
# exactly what to paste into its own settings — checked against
# audiobookshelf.org's own OIDC docs directly: config lives entirely in
# Settings -> Authentication in the app's UI, no env var or config API to
# automate the app side with (unlike Mealie/ActualBudget/Immich), so this
# only automates the Authelia half. Its own Authelia integration doc
# (authelia.com) requires PKCE — the fifth arg to
# _authelia_provision_oidc_client below.
_audiobookshelf_offer_authelia_oidc() {
    declare -F _authelia_provision_oidc_client >/dev/null 2>&1 || return 0
    [ -d "$DOCKER_DIR/authelia" ] || return 0

    echo ""
    local USE_SSO=""
    prompt_yn "  Add \"Sign in with Authelia\" (OpenID Connect) to Audiobookshelf? (y/n):" "n" USE_SSO
    [[ "$USE_SSO" =~ ^[Yy]$ ]] || return 0

    local APP_DOMAIN
    APP_DOMAIN="$(_authelia_pick_domain "Domain Audiobookshelf is reachable at (number or domain)")"
    if [ -z "$APP_DOMAIN" ]; then
        log_warning "No domain entered — skipping SSO setup."
        return 0
    fi

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

    if ! _authelia_provision_oidc_client "Audiobookshelf" "audiobookshelf" "$AUTH_POLICY" "y" "y" "" \
        "https://${APP_DOMAIN}/auth/openid/callback" "https://${APP_DOMAIN}/auth/openid/mobile-redirect" "audiobookshelf://oauth"; then
        log_warning "Couldn't register Audiobookshelf as an OIDC client in Authelia — skipping SSO setup."
        return 0
    fi

    echo ""
    echo "  Audiobookshelf -> Settings -> Authentication -> enable OpenID Connect"
    echo "  Authentication, then fill in (it wants individual endpoints, not a"
    echo "  discovery URL):"
    echo "    Issuer URL:      ${OIDC_AUTHELIA_PORTAL_URL}"
    echo "    Authorize URL:   ${OIDC_AUTHELIA_PORTAL_URL}/api/oidc/authorization"
    echo "    Token URL:       ${OIDC_AUTHELIA_PORTAL_URL}/api/oidc/token"
    echo "    Userinfo URL:    ${OIDC_AUTHELIA_PORTAL_URL}/api/oidc/userinfo"
    echo "    JWKS URL:        ${OIDC_AUTHELIA_PORTAL_URL}/jwks.json"
    echo "    Client ID:       audiobookshelf"
    echo "    Client Secret:   $OIDC_CLIENT_SECRET_PLAIN"
    echo "    Signing Algorithm: RS256"
    echo "    Allowed Mobile Redirect URIs: audiobookshelf://oauth"
    echo ""
    log_warning "The Client Secret above is shown once — save it now."

    declare -F _authelia_scope_access >/dev/null 2>&1 && _authelia_scope_access "audiobookshelf" "$APP_DOMAIN"
}

install_audiobookshelf() {
    require_docker || return 1

    # ── Instance selection ───────────────────────────────────────────────────
    # First instance keeps the plain "audiobookshelf" name/paths/port exactly
    # as before (zero behavior change for anyone with a single instance). Only
    # asking to add a second one introduces suffixed naming — same pattern as
    # services/mattermost.sh and services/wordpress.sh.
    local ABS_DIR="$DOCKER_DIR/audiobookshelf"
    local INSTANCE_SUFFIX="" CONTAINER="audiobookshelf"
    local WEB_PORT="13378"
    local DEFAULT_AUDIOBOOKS="$ACTUAL_HOME/audiobooks"

    if [ "$DRY_RUN" = true ]; then
        echo "[DRY-RUN] Audiobookshelf would:"
        echo "  - Offer to add a new, separate instance if one already exists"
        echo "  - Create \$DOCKER_DIR/audiobookshelf(-<name>) with docker-compose.yml + .env"
        echo "  - Mount an audiobooks folder (default $DEFAULT_AUDIOBOOKS) at /audiobooks"
        echo "  - Auto-scan for a free host port if this is an additional instance"
        echo "  - Offer a Caddy reverse proxy and to start the container"
        return 0
    fi

    if [ -d "$ABS_DIR" ]; then
        echo ""
        echo "  Audiobookshelf is already installed at $ABS_DIR."
        echo "    1) Manage that install (update / full reinstall / cancel)"
        echo "    2) Add a NEW, separate Audiobookshelf instance alongside it (its own"
        echo "       server, library, and port — full isolation)"
        echo ""
        local _TOP_CHOICE=""
        prompt_text "  Choice [1/2]:" "1" _TOP_CHOICE
        if [ "$_TOP_CHOICE" = "2" ]; then
            local _suffix=""
            while true; do
                prompt_text "  Short name for the new instance (letters/numbers/hyphens, e.g. 'kids'):" "" _suffix
                _suffix="$(echo "$_suffix" | tr -cs 'a-zA-Z0-9-' '-' | sed 's/^-*//;s/-*$//')"
                if [ -z "$_suffix" ]; then
                    log_warning "Name can't be empty."; continue
                fi
                if [ -d "$DOCKER_DIR/audiobookshelf-$_suffix" ]; then
                    log_warning "audiobookshelf-$_suffix already exists — pick another name."; continue
                fi
                break
            done
            INSTANCE_SUFFIX="$_suffix"
            ABS_DIR="$DOCKER_DIR/audiobookshelf-$_suffix"
            CONTAINER="audiobookshelf-$_suffix"
            DEFAULT_AUDIOBOOKS="$ACTUAL_HOME/audiobooks-$_suffix"
            log_info "New instance: $ABS_DIR"
        else
            # "Manage that install" on THIS instance — the banner above promises
            # update/fresh/cancel, so actually offer it instead of falling straight
            # through into the same unconditional-overwrite flow as a new install.
            if [[ -f "$ABS_DIR/docker-compose.yml" ]]; then
                local MODE=""
                prompt_reinstall_mode MODE
                case "$MODE" in
                    update)
                        log_info "Refreshing the Audiobookshelf image only — existing config, port, and Caddy setup are left as-is."
                        ( cd "$ABS_DIR" && docker compose pull && docker compose up -d ) \
                            && log_success "Audiobookshelf image refreshed" \
                            || log_warning "Refresh failed — check: docker compose -f $ABS_DIR/docker-compose.yml logs"
                        _audiobookshelf_offer_authelia_oidc
                        return 0
                        ;;
                    cancel)
                        log_info "Leaving the existing install as-is."
                        return 0
                        ;;
                    fresh) ;;  # fall through to the full install flow below
                esac
            fi
        fi
    fi

    # Scan for a free port unconditionally — not just when adding an explicit
    # additional instance. A plain first install can just as easily collide
    # with an unrelated service that already claimed this default port — see
    # CLAUDE.md's "Port collision avoidance" section.
    find_free_port WEB_PORT "$WEB_PORT"

    # Reset before the chain call, not after — VDM_LAST_MOUNT_POINT is a
    # plain global set by services/vpn-data-mount.sh, so without this an
    # unrelated earlier vpn-data-mount run in the same setup.sh session
    # would silently leak its mount point in here as the default even if
    # the user declines below or this chain never runs at all.
    unset VDM_LAST_MOUNT_POINT
    if declare -F install_vpn-data-mount >/dev/null 2>&1; then
        local USE_VPN_DATA=""
        prompt_yn "Are your audiobooks on a VPN-connected home box that isn't mounted yet? (y/n):" "n" USE_VPN_DATA
        [[ "$USE_VPN_DATA" =~ ^[Yy]$ ]] && install_vpn-data-mount
    fi
    [ -n "${VDM_LAST_MOUNT_POINT:-}" ] && DEFAULT_AUDIOBOOKS="$VDM_LAST_MOUNT_POINT"

    local AUDIOBOOKS_PATH=""
    prompt_text "Path to audiobooks folder [$DEFAULT_AUDIOBOOKS]:" "$DEFAULT_AUDIOBOOKS" AUDIOBOOKS_PATH
    AUDIOBOOKS_PATH="${AUDIOBOOKS_PATH/#\~/$ACTUAL_HOME}"; AUDIOBOOKS_PATH="${AUDIOBOOKS_PATH%/}"

    mkdir -p "$ABS_DIR"
    ensure_docker_dir_ownership "$ABS_DIR"
    cd "$ABS_DIR" || return 1

    local TZ_VAL; TZ_VAL="${SITE_TZ:-$(cat /etc/timezone 2>/dev/null || echo UTC)}"

    # Mirrors configure_caddy_for_service's own mode resolution (lib/common.sh):
    # explicit CADDY_MODE from the site config wins, then a local ~/docker/caddy,
    # then the legacy CADDY_REMOTE_HOST var. Only "local" joins caddy_net — a
    # remote Caddy box can't resolve container names on this host's bridge
    # network anyway; it reaches this service via the host's published port.
    local _CADDY_MODE="${CADDY_MODE:-none}"
    [ "$_CADDY_MODE" = "none" ] && [ -d "$DOCKER_DIR/caddy" ] && _CADDY_MODE="local"
    [ "$_CADDY_MODE" = "none" ] && [ -n "${CADDY_REMOTE_HOST:-}" ] && _CADDY_MODE="remote"

    local _CADDY_NET_BLOCK=""
    local _CADDY_NET_SECTION=""
    if [ "$_CADDY_MODE" = "local" ]; then
        _CADDY_NET_BLOCK="    networks:
      - caddy_net
"
        _CADDY_NET_SECTION="
networks:
  caddy_net:
    external: true
    name: ${SITE_CADDY_NET:-caddy_net}
"
    fi

    backup_if_exists docker-compose.yml
    cat > docker-compose.yml << ABS_COMPOSE
name: $CONTAINER

services:
  audiobookshelf:
    image: ghcr.io/advplyr/audiobookshelf:latest
    container_name: $CONTAINER
    hostname: $CONTAINER
    restart: unless-stopped
    environment:
      - TZ=$TZ_VAL
    volumes:
      - ./config:/config
      - ./metadata:/metadata
      - \${AUDIOBOOKS_PATH}:/audiobooks
      - \${PODCASTS_PATH:-./podcasts}:/podcasts
    ports:
      - "${WEB_PORT}:80"
${_CADDY_NET_BLOCK}${_CADDY_NET_SECTION}
ABS_COMPOSE

    backup_if_exists .env
    cat > .env << ABS_ENV
AUDIOBOOKS_PATH=$AUDIOBOOKS_PATH
PODCASTS_PATH=./podcasts
CADDY_NET=$SITE_CADDY_NET
ABS_ENV

    mkdir -p config metadata podcasts
    chown -R "$ACTUAL_USER:$ACTUAL_USER" "$ABS_DIR"
    log_success "Audiobookshelf${INSTANCE_SUFFIX:+ ($INSTANCE_SUFFIX)} configured at $ABS_DIR (port $WEB_PORT)"

    configure_caddy_for_service "Audiobookshelf${INSTANCE_SUFFIX:+ ($INSTANCE_SUFFIX)}" "${CONTAINER}:80" "audiobooks${INSTANCE_SUFFIX:+-$INSTANCE_SUFFIX}"

    _audiobookshelf_offer_authelia_oidc

    write_readme "$ABS_DIR" << MD
# Audiobookshelf${INSTANCE_SUFFIX:+ — $INSTANCE_SUFFIX}

Self-hosted audiobook and podcast server with progress sync across devices.
$( [ -n "$INSTANCE_SUFFIX" ] && echo "
This is a separate, fully isolated instance (own server, own library, own
port) — not a shared library with another Audiobookshelf instance.")

- Web UI: http://localhost:${WEB_PORT}
- Audiobooks: \`$AUDIOBOOKS_PATH\` → mounted at /audiobooks
- Podcasts: \`podcasts/\` in this folder → /podcasts (change \`PODCASTS_PATH\` in .env)
- App data: \`config/\` and \`metadata/\`

## Manage
\`\`\`bash
cd $ABS_DIR
docker compose up -d      # start
docker compose down       # stop
docker compose logs -f    # logs
docker compose pull && docker compose up -d   # update
\`\`\`

First launch: open the web UI, create your admin account, then add libraries
pointing at /audiobooks and /podcasts.
MD

    local START_ABS=""
    prompt_yn "Start Audiobookshelf${INSTANCE_SUFFIX:+ ($INSTANCE_SUFFIX)} now? (y/n):" "y" START_ABS
    if [ "$START_ABS" = "y" ] || [ "$START_ABS" = "Y" ]; then
        docker compose up -d && log_success "Audiobookshelf${INSTANCE_SUFFIX:+ ($INSTANCE_SUFFIX)} started" || log_warning "Failed to start — check: docker compose logs"
    fi

    echo ""
    echo "  Access at:  http://localhost:${WEB_PORT}"
    echo ""
}

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