#!/bin/bash
# services/fmd.sh — FindMyDevice server for Android device tracking (FMD).
# Part of the modular post-install system (sourced by setup.sh).
#
# Can also be run standalone on any machine:
#   sudo bash fmd.sh
# (Docker must already be installed when run standalone)
#
# Ported from ubuntu-post-install-24.04-crowdsec.sh (# ---- FINDMYDEVICE ----).
# Own ~/docker/fmd/ with a standalone docker-compose.yml + .env.
# Mobile app: "FMD" (by Nulide) on F-Droid — not the Google Find My Device app.
#
# Image: registry.gitlab.com/fmd-foss/fmd-server (GitLab's own registry, no
# Docker Hub image exists). The project has moved twice — originally
# nulide/findmydevice on Docker Hub, then gitlab.com/Nulide/findmydeviceserver,
# now gitlab.com/fmd-foss/fmd-server — and was rewritten from Node.js to
# Go+React along the way. Confirmed live: the old nulide/findmydevice image
# no longer exists at all ("pull access denied"), so this service never
# actually started on any box that installed it before this fix. The old
# single shared FMD_ADMIN_PASSWORD model is gone too — the current server
# uses per-user self-registration gated by an optional FMD_REGISTRATIONTOKEN,
# and stores its database at /var/lib/fmd-server/db, not /fmd/data.

# ── 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 fmd utilities "Android device tracking — alternative to Google Find My Device (FMD)" 8084

install_fmd() {
    require_docker || return 1

    # ── Instance selection ───────────────────────────────────────────────────
    # First instance keeps the plain "fmd" 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 FMD_DIR="$DOCKER_DIR/fmd"
    local INSTANCE_SUFFIX="" CONTAINER="fmd"
    local WEB_PORT="8084"

    if [ "$DRY_RUN" = true ]; then
        echo "[DRY-RUN] FindMyDevice would:"
        echo "  - Offer to add a new, separate instance if one already exists"
        echo "  - Create \$DOCKER_DIR/fmd(-<name>) with docker-compose.yml + .env (data/)"
        echo "  - Generate a random registration token"
        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 "$FMD_DIR" ]; then
        echo ""
        echo "  FindMyDevice is already installed at $FMD_DIR."
        echo "    1) Manage that install (update / full reinstall / cancel)"
        echo "    2) Add a NEW, separate FindMyDevice instance alongside it (its own"
        echo "       server, password, and port — full isolation)"
        echo ""
        local _TOP_CHOICE=""
        prompt_text "  Choice [1/2]:" "1" _TOP_CHOICE
        if [ "$_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 "$DOCKER_DIR/fmd-$_suffix" ]; then
                    log_warning "fmd-$_suffix already exists — pick another name."; continue
                fi
                break
            done
            INSTANCE_SUFFIX="$_suffix"
            FMD_DIR="$DOCKER_DIR/fmd-$_suffix"
            CONTAINER="fmd-$_suffix"
            log_info "New instance: $FMD_DIR"
        else
            # "Manage that install" on THIS instance — the banner above promises
            # update/fresh/cancel, so actually offer it instead of falling straight
            # through into the same unconditional-overwrite flow as a new install.
            if [[ -f "$FMD_DIR/docker-compose.yml" ]]; then
                local MODE=""
                prompt_reinstall_mode MODE
                case "$MODE" in
                    update)
                        log_info "Refreshing the FindMyDevice image only — token, port, and Caddy config are left as-is."
                        # fmd-server's image runs as a fixed, non-configurable
                        # UID:GID 1000:1000 (confirmed against its own
                        # Dockerfile — not something PUID/PGID or similar can
                        # override). The bind-mounted ./data dir needs that
                        # exact numeric ownership regardless of what host user
                        # actually owns it; re-assert it on every update too,
                        # not just at install time, so a box whose data/ was
                        # ever chowned to something else (e.g. $ACTUAL_USER
                        # not being UID 1000) self-heals instead of staying
                        # stuck crash-looping on "permission denied" forever.
                        [ -d "$FMD_DIR/data" ] && chown -R 1000:1000 "$FMD_DIR/data"
                        ( cd "$FMD_DIR" && docker compose pull && docker compose up -d ) \
                            && log_success "FindMyDevice image refreshed" \
                            || log_warning "Refresh failed — check: docker compose -f $FMD_DIR/docker-compose.yml logs"
                        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"

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

    local FMD_TOKEN
    FMD_TOKEN=$(openssl rand -base64 16 | tr -dc 'a-zA-Z0-9' | head -c 16)

    # 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 << FMD_COMPOSE
name: $CONTAINER

services:
  fmd:
    image: registry.gitlab.com/fmd-foss/fmd-server:0
    container_name: $CONTAINER
    hostname: $CONTAINER
    restart: unless-stopped
    environment:
      - FMD_REGISTRATIONTOKEN=\${FMD_REGISTRATIONTOKEN}
    volumes:
      - ./data:/var/lib/fmd-server/db
    ports:
      - "${WEB_PORT}:8080"
${_CADDY_NET_BLOCK}${_CADDY_NET_SECTION}
FMD_COMPOSE

    backup_if_exists .env
    cat > .env << FMD_ENV
FMD_REGISTRATIONTOKEN=$FMD_TOKEN
CADDY_NET=$SITE_CADDY_NET
FMD_ENV

    mkdir -p data
    chown -R "$ACTUAL_USER:$ACTUAL_USER" "$FMD_DIR"
    # fmd-server's image runs as a fixed, non-configurable UID:GID 1000:1000
    # (confirmed against its own Dockerfile: `useradd --uid 1000 fmd-server`,
    # baked in, not something an env var can override) — the bind mount at
    # ./data:/var/lib/fmd-server/db needs that exact numeric ownership on the
    # host side regardless of $ACTUAL_USER's actual UID, or the container
    # crash-loops on "permission denied" trying to create its sqlite db.
    # Confirmed live. Must run AFTER the chown above, not before, since that
    # one is recursive over the whole directory and would otherwise
    # overwrite this.
    chown -R 1000:1000 "$FMD_DIR/data"
    log_success "FindMyDevice${INSTANCE_SUFFIX:+ ($INSTANCE_SUFFIX)} configured at $FMD_DIR (port $WEB_PORT)"

    configure_caddy_for_service "FindMyDevice${INSTANCE_SUFFIX:+ ($INSTANCE_SUFFIX)}" "${CONTAINER}:8080" "fmd${INSTANCE_SUFFIX:+-$INSTANCE_SUFFIX}"

    write_readme "$FMD_DIR" << MD
# FindMyDevice (FMD)${INSTANCE_SUFFIX:+ — $INSTANCE_SUFFIX}

Self-hosted Android device tracking — locate, lock, or wipe your device
from the web UI. Alternative to Google's Find My Device.
$( [ -n "$INSTANCE_SUFFIX" ] && echo "
This is a separate, fully isolated instance (own server, own password, own
port) — not shared devices with another FindMyDevice instance.")

- Web UI: http://localhost:${WEB_PORT}
- Registration token: stored in \`.env\` (\`FMD_REGISTRATIONTOKEN\`) — the FMD
  app must supply this when creating an account on this server, so a
  stranger who finds the URL can't just self-register. Leave the \`.env\`
  value blank and restart if you'd rather allow open registration.
- App data: \`data/\` (mounted at the container's own db path)

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

## Mobile app
Install **FMD** from **F-Droid** (search "Find My Device", by Nulide — not
the Google "Find My Device" app):
1. Open the app → create/register an account → Server URL →
   \`http://YOUR-SERVER-IP:${WEB_PORT}\`
2. Enter the registration token from \`.env\` when prompted
3. Grant location and accessibility permissions
MD

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

    echo ""
    echo "  Access at:          http://localhost:${WEB_PORT}"
    echo "  Registration token: $FMD_TOKEN  (saved in .env)"
    echo "  Mobile app:         FMD (by Nulide) on F-Droid"
    echo ""
}

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