#!/bin/bash
# services/drum-rhythm-game.sh — Browser-based drum rhythm game (outis1one/drum-rhythm-game).
# Part of the modular post-install system (sourced by setup.sh).
#
# Can also be run standalone on any machine:
#   sudo bash drum-rhythm-game.sh
# (Docker must already be installed when run standalone)
#
# Serves a single self-contained index.html via nginx. No login — protect
# with Authelia via Caddy if you want access control.
# Source: https://github.com/outis1one/drum-rhythm-game

# ── 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##*:}"

            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
            }

            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; }

            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"
        }
    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}"
    CADDY_REMOTE_HOST="${CADDY_REMOTE_HOST:-}"

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

register_service drum-rhythm-game gaming "Browser-based drum rhythm game (outis1one/drum-rhythm-game)" 8096

install_drum-rhythm-game() {
    require_docker || return 1

    local DRUM_DIR="$DOCKER_DIR/drum-rhythm-game"
    local REPO_URL="https://github.com/outis1one/drum-rhythm-game.git"
    local WEB_PORT="8096"

    if [ "$DRY_RUN" = true ]; then
        echo "[DRY-RUN] drum-rhythm-game would:"
        echo "  - Clone $REPO_URL to $DRUM_DIR/html"
        echo "  - Build the repo's own Dockerfile (nginx, gzip, /healthz) on port 8096"
        echo "    (auto-scanned for a free host port — 8096 is also emby/jellyfin's default)"
        echo "  - Offer Authelia SSO protection via Caddy (no built-in auth)"
        return 0
    fi

    # Scan for a free host port — this default (8096) is also emby's and
    # jellyfin's default, so a plain install shouldn't silently claim a port
    # another already-running service holds. See CLAUDE.md's "Port collision
    # avoidance" section.
    find_free_port WEB_PORT "$WEB_PORT"

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

    # Clone or update the game source
    if [ -d "$DRUM_DIR/html/.git" ]; then
        log_info "Updating drum-rhythm-game source..."
        git -C "$DRUM_DIR/html" pull --ff-only 2>/dev/null \
            && log_success "Updated to latest" \
            || log_warning "Could not pull latest — using existing version"
    else
        log_info "Cloning drum-rhythm-game..."
        git clone --depth 1 "$REPO_URL" "$DRUM_DIR/html" \
            || { log_error "Clone failed — check network and git access"; return 1; }
    fi

    # Apply local runtime fixes for the upstream single-page game.  The game is
    # intentionally static, so we patch index.html after clone/pull instead of
    # forking the deployment source.  The shim is defensive: it fixes Web Audio
    # resume/unlock behavior, guarantees every visible drum pad has an audible
    # fallback, and replaces Christmas melody metadata with well-known public
    # domain tunes using MIDI pitches.
    log_info "Applying drum-rhythm-game Christmas/audio fixes..."
    cat > "$DRUM_DIR/html/ubuntu-post-install-fixes.js" <<'DRUM_FIXES_JS'
(() => {
  'use strict';

  const NOTE_TO_MIDI = { C: 0, D: 2, E: 4, F: 5, G: 7, A: 9, B: 11 };
  // Sourced tune corrections.  Do not add songs here from memory: every
  // melody/rhythm entry must point at a reproducible score/ABC source.
  // The properly sourced passes now cover Christmas songs from Milwaukee
  // Irish Fest School of Music, plus Sing Along, Classical, and Nursery
  // Rhymes songs from abcnotation.com.  Classical entries are public-domain
  // compositions, and nursery-rhyme entries are traditional/public-domain
  // melodies; source URLs are retained for reproducible transcription.
  const CATEGORY_TUNES = {
    'jingle bells': {
      title: 'Jingle Bells', bpm: 112,
      source: 'Milwaukee Irish Fest School of Music ABC notation PDF: https://irishfestschoolofmusic.com/School-of-Music/Tunes/ifsm-polkas-xmas-jinglebells-abc.pdf',
      sourceAbc: '|: BB B2 | BB B2 | Bd GA | B4 | |cc c>c|cB B>B |[1 BA AB | A2 d2 :|[2 dd cA | G2- G2 || DB AG | D2- DD/D/ | DB AG | E2- EE/E/ | Ec BA | F2- FA/A/ | dd cA | B4 | DB AG | D2 DD/D/| DB AG | E2- EE/E/ | Ec BA | dd dd/d/ | ed cA | G2 d2|]',
      // Source metadata: M:2/4, L:1/8, K:Gmaj.  Repeats/endings are expanded
      // explicitly below so the game receives deterministic note events.
      melody: 'B4 B4 B4 B4 B4 B4 B4 B4 B4 D5 G4 A4 B4 C5 C5 C5 C5 C5 B4 B4 B4 B4 A4 A4 A4 B4 A4 D5 B4 B4 B4 B4 B4 B4 B4 B4 B4 D5 G4 A4 B4 C5 C5 C5 C5 C5 B4 B4 B4 B4 D5 D5 C5 A4 G4',
      beats:  '1 1 2 1 1 2 1 1 1 1 4 1 1 1.5 0.5 1 1.5 0.5 1 1 1 1 2 2 1 1 1 4 1 1 1 1 1 2 1 1 1 1 4 1 1 1.5 0.5 1 1.5 0.5 1 1 1 1 1 1 1 1 4'
    },
    'deck the halls': {
      title: 'Deck The Halls', bpm: 128,
      source: 'Milwaukee Irish Fest School of Music ABC notation PDF: https://irishfestschoolofmusic.com/School-of-Music/Tunes/ifsm-xmas-deckthehalls-abc.pdf',
      sourceAbc: '|: d3 c B2 A2 | G2 A2 B2 G2 | ABcA B3 A | G2 F2 G4 :| |A3 B c2 A2 |B3 c d2 A2 | Bc d2 ef g2 |f2 e2 d4 |d3 c B2 A2 | G2 A2 B2 G2 |ABcA B3 A | G2 F2 G4|]',
      melody: 'D5 C5 B4 A4 G4 A4 B4 G4 A4 B4 C5 A4 B4 A4 G4 F#4 G4 D5 C5 B4 A4 G4 A4 B4 G4 A4 B4 C5 A4 B4 A4 G4 F#4 G4 A4 B4 C5 A4 B4 C5 D5 A4 B4 C5 D5 E5 F#5 G5 F#5 E5 D5 D5 C5 B4 A4 G4 A4 B4 G4 A4 B4 C5 A4 B4 A4 G4 F#4 G4',
      beats:  '3 1 2 2 2 2 2 2 1 1 1 1 3 1 2 2 4 3 1 2 2 2 2 2 2 1 1 1 1 3 1 2 2 4 3 1 2 2 3 1 2 2 1 1 2 1 1 2 2 2 4 3 1 2 2 2 2 2 2 1 1 1 1 3 1 2 2 4'
    },
    'we wish you a merry christmas': {
      title: 'We Wish You a Merry Christmas', bpm: 108,
      source: 'Milwaukee Irish Fest School of Music ABC notation PDF: https://irishfestschoolofmusic.com/School-of-Music/Tunes/ifsm-waltz-xmas-wewishyouamerrychristmas-abc.pdf',
      sourceAbc: 'D2 ||G2 GA GF| E2 E2 E2|A2 AB AG |F2 D2 D2| |B2 Bc BA | G2 E2 DD | E2 A2 F2 | G4 D2|| |G2 G2 G2 | F4 F2 | G2 F2 E2 | D4 A2 | |B2 A2 GG | d2 D2 DD | E2 A2 F2 | G4 D2 |]',
      melody: 'D4 G4 G4 A4 G4 F#4 E4 E4 E4 A4 A4 B4 A4 G4 F#4 D4 D4 B4 B4 C5 B4 A4 G4 E4 D4 D4 E4 A4 F#4 G4 D4 G4 G4 G4 F#4 F#4 G4 F#4 E4 D4 A4 B4 A4 G4 G4 D5 D4 D4 E4 A4 F#4 G4 D4',
      beats:  '2 2 1 1 1 1 2 2 2 2 1 1 1 1 2 2 2 2 1 1 1 1 2 2 1 1 2 2 2 4 2 2 2 2 4 2 2 2 2 4 2 2 2 1 1 2 2 1 1 2 2 4 2'
    },
    'twinkle twinkle little star': {
      title: 'Twinkle, Twinkle, Little Star', bpm: 96,
      source: 'abcnotation.com tune page from the John Chambers abc collection: https://abcnotation.com/tunePage?a=trillian.mit.edu%2F~jc%2Fmusic%2Fabc%2Fmirror%2Fgulfweb.net%3A34043%2F~rlwalker%2Fabc%2Ftwinkle%2F0000',
      sourceAbc: '|"D"D D A A|"G"B B "D"A2|"G"G G "D"F F|"A"E/2E/2E/2E/2 "D"D2|"D"A A "G"G G|"D"F F "A"E2|"D"A A "G"G G|"D"F F "A"E2|"D"D D A A|"G"B B "D"A2|"G"G G "D"F F|"A"E/2E/2E/2E/2 "D"D2|]',
      // Source metadata: M:4/4, L:1/4, K:D.  F notes are raised for K:D.
      melody: 'D4 D4 A4 A4 B4 B4 A4 G4 G4 F#4 F#4 E4 E4 E4 E4 D4 A4 A4 G4 G4 F#4 F#4 E4 A4 A4 G4 G4 F#4 F#4 E4 D4 D4 A4 A4 B4 B4 A4 G4 G4 F#4 F#4 E4 E4 E4 E4 D4',
      beats:  '1 1 1 1 1 1 2 1 1 1 1 0.5 0.5 0.5 0.5 2 1 1 1 1 1 1 2 1 1 1 1 1 1 2 1 1 1 1 1 1 2 1 1 1 1 0.5 0.5 0.5 0.5 2'
    },
    'mary had a little lamb': {
      title: 'Mary had a little lamb', bpm: 108,
      source: 'abcnotation.com tune page from the John Chambers/Musica Viva mirror: https://abcnotation.com/tunePage?a=trillian.mit.edu%2F~jc%2Fmusic%2Fabc%2Fmirror%2Fmusicaviva.com%2Fengland%2Fmary-had-a-little-lamb-f%2F0000',
      sourceAbc: 'AGFG|AAA2|GGG2|AAA2|AGFG|AAAA|GGAG|F4|]',
      melody: 'A4 G4 F4 G4 A4 A4 A4 G4 G4 G4 A4 A4 A4 A4 G4 F4 G4 A4 A4 A4 A4 G4 G4 A4 G4 F4',
      beats:  '1 1 1 1 1 1 2 1 1 2 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 4'
    },
    'row row row your boat': {
      title: 'Row, row, row your boat', bpm: 100,
      source: 'abcnotation.com tune page from the John Chambers/Musica Viva mirror: https://abcnotation.com/tunePage?a=trillian.mit.edu%2F~jc%2Fmusic%2Fabc%2Fmirror%2Fmusicaviva.com%2Fengland%2Frow-row-c%2Frow-row-c-c24%2F0000',
      sourceAbc: 'C3 C3|C2D E3|E2D E2F|G6|ccc GGG|EEE CCC|G2F E2D|C6:|',
      melody: 'C4 C4 C4 D4 E4 E4 D4 E4 F4 G4 C5 C5 C5 G4 G4 G4 E4 E4 E4 C4 C4 C4 G4 F4 E4 D4 C4',
      beats:  '3 3 2 1 3 2 1 2 1 6 1 1 1 1 1 1 1 1 1 1 1 1 2 1 2 1 6'
    },
    'old macdonald': {
      title: 'Old Mac Donald', bpm: 140,
      source: 'abcnotation.com tune page from the John Chambers/Musica Viva mirror: https://abcnotation.com/tunePage?a=trillian.mit.edu%2F~jc%2Fmusic%2Fabc%2Fmirror%2Fmusicaviva.com%2Fengland%2Fold-mac-donald-f%2Fold-mac-donald-f-1%2F0000',
      sourceAbc: '"F"FFFC|"Bb"DD"F"C2|"G7"AA"C7"GG|"F"F2 z C|"F"FFFC|"Bb"DD"F"C2|"G7"AA"C7"GG|"F"F2 z2|]',
      melody: 'F4 F4 F4 C4 D4 D4 C4 A4 A4 G4 G4 F4 R C4 F4 F4 F4 C4 D4 D4 C4 A4 A4 G4 G4 F4 R',
      beats:  '1 1 1 1 1 1 2 1 1 1 1 2 1 1 1 1 1 1 1 1 2 1 1 1 1 2 2'
    },
    'ode to joy': {
      title: 'Ode to Joy', bpm: 112,
      publicDomainComposition: true,
      composer: 'Ludwig van Beethoven',
      source: 'abcnotation.com tune page from the John Chambers mirror: https://abcnotation.com/tunePage?a=trillian.mit.edu%2F~jc%2Fmusic%2Fabc%2Fmirror%2Fmindspring.com%2F~thornton.rose%2FOdeToJoy%2F0001',
      sourceAbc: 'F F G A | A G F E | D D E F | F>E E2 | F F G A | A G F E | D D E F | E>D D2 |: E E F D | E F/2G/2 F D | E F/2G/2 F E | D E A,2 | F F G A | A G F E | D D E F | E>D D2 :|',
      // Source metadata: C:L. Van Beethoven, M:4/4, L:1/4, K:D. F notes are raised for K:D.
      melody: 'F#4 F#4 G4 A4 A4 G4 F#4 E4 D4 D4 E4 F#4 F#4 E4 E4 F#4 F#4 G4 A4 A4 G4 F#4 E4 D4 D4 E4 F#4 E4 D4 D4 E4 E4 F#4 D4 E4 F#4 G4 F#4 D4 E4 F#4 G4 F#4 E4 D4 E4 A3 F#4 F#4 G4 A4 A4 G4 F#4 E4 D4 D4 E4 F#4 E4 D4 D4',
      beats:  '1 1 1 1 1 1 1 1 1 1 1 1 1.5 0.5 2 1 1 1 1 1 1 1 1 1 1 1 1 1.5 0.5 2 1 1 1 1 1 0.5 0.5 1 1 1 0.5 0.5 1 1 1 1 2 1 1 1 1 1 1 1 1 1 1 1 1 1.5 0.5 2'
    },
    'minuet in g major': {
      title: 'Minuet in G Major', bpm: 108,
      publicDomainComposition: true,
      composer: 'Christian Petzold',
      source: 'abcnotation.com tune page for BWV Anhang 114: https://abcnotation.com/tunePage?a=spuds.thursdaycontra.com%2FTuneSwaps%2FSPUDS_TS20_Old%2F0012',
      sourceAbc: 'd G/A/ B/c/ | d G G | e c/d/e/f/ | g G G |',
      // Source metadata: C:Christian Petzold (1677-1733), formerly attributed to J. S. Bach; L:1/4, M:3/4, K:G.
      melody: 'D5 G4 A4 B4 C5 D5 G4 G4 E5 C5 D5 E5 F#5 G5 G4 G4',
      beats:  '1 0.5 0.5 0.5 0.5 1 1 1 1 0.5 0.5 0.5 0.5 1 1 1'
    },
    'baa baa black sheep': {
      title: 'Baa Baa Black Sheep', bpm: 112,
      publicDomainComposition: true,
      composer: 'Traditional',
      source: 'abcnotation.com tune page from John Chambers music books collection: https://abcnotation.com/tunePage?a=trillian.mit.edu%2F~jc%2Fmusic%2Fbook%2FTomAnderson%2FHaandMeDoonDaFiddle%2F0002',
      sourceAbc: 'A2A2 e2e2 | fgaf e4 | d2d2 c2c2 | B2B2 A4 | e2ee d2d2 | c2cc B4 | e2ee d2d2 | c2cc B4 | A2A2 e2e2 | fgaf e4 | d2d2 c2c2 | B2B2 A4 |]',
      // Source metadata: M:C, L:1/8, K:A. C/F/G are raised for K:A.
      melody: 'A4 A4 E5 E5 F#5 G#5 A5 F#5 E5 D5 D5 C#5 C#5 B4 B4 A4 E5 E5 E5 D5 D5 C#5 C#5 C#5 B4 E5 E5 E5 D5 D5 C#5 C#5 C#5 B4 A4 A4 E5 E5 F#5 G#5 A5 F#5 E5 D5 D5 C#5 C#5 B4 B4 A4',
      beats:  '2 2 2 2 1 1 1 1 4 2 2 2 2 2 2 4 2 1 1 2 2 2 1 1 4 2 1 1 2 2 2 1 1 4 2 2 2 2 1 1 1 1 4 2 2 2 2 2 2 4'
    },
    'three blind mice': {
      title: 'The Three Blind Mice', bpm: 104,
      publicDomainComposition: true,
      composer: 'Traditional',
      source: 'abcnotation.com tune page from the John Chambers Everyday Song Book mirror: https://abcnotation.com/tunePage?a=trillian.mit.edu%2F~jc%2Fmusic%2Fbook%2FEverydaySongBook%2FEverydaySongBook1%2F0224',
      sourceAbc: 'G3 F3 | E3 z2z | G3 F3 | E3 z2z | B3 A2 A | G3 z2z | B3 A2 A | G3 z2B | e2 e d c d | e2 B B2 B | e e e d c d | e2 B B2 B | e e e d c d | e B B B2 A | G3 F3 | E3 z2z |]',
      // Source metadata: O:Old Round, M:6/8, L:1/8, K:Eb. E/A/B are flattened for K:Eb.
      melody: 'G4 F4 Eb4 R G4 F4 Eb4 R Bb4 Ab4 Ab4 G4 R Bb4 Ab4 Ab4 G4 R Bb4 Eb5 Eb5 Eb5 D5 C5 D5 Eb5 Bb4 Bb4 Bb4 Eb5 Eb5 Eb5 D5 C5 D5 Eb5 Bb4 Bb4 Bb4 Eb5 Eb5 Eb5 D5 C5 D5 Eb5 Bb4 Bb4 Bb4 Ab4 G4 F4 Eb4 R',
      beats:  '3 3 3 3 3 3 3 3 3 2 1 3 3 3 2 1 3 2 1 2 1 1 1 1 2 1 2 1 1 1 1 1 1 2 1 2 1 1 1 1 1 1 1 1 1 1 1 2 1 3 3 3 3 3'
    },
    'pop goes the weasel': {
      title: 'Pop Goes the Weasel', bpm: 120,
      publicDomainComposition: true,
      composer: 'Traditional',
      source: 'abcnotation.com tune page from the John Chambers mirror of PopGoesTheWeasel: https://abcnotation.com/tunePage?a=trillian.mit.edu%2F~jc%2Fmusic%2Fabc%2Fmirror%2Fsbigraf.tamu.edu%2FPopGoesTheWeasel%2F0000',
      sourceAbc: 'G2G A2A | BdB G2z | G2G A2c | B3 G2z | G2G A2A | BdB G2z | e3 A2c | B3 G2z :|',
      // Source metadata: B:Ryan's Mammoth Collection (1882), L:1/8, M:6/8, K:G.
      melody: 'G4 G4 A4 A4 B4 D5 B4 G4 R G4 G4 A4 C5 B4 G4 R G4 G4 A4 A4 B4 D5 B4 G4 R E5 A4 C5 B4 G4 R',
      beats:  '2 1 2 1 1 1 1 2 1 2 1 2 1 3 2 1 2 1 2 1 1 1 1 2 1 3 2 1 3 2 1'
    }
  };

  const toMidi = (note) => {
    if (!note || note === 'R') return null;
    const match = /^([A-G])([#b]?)(-?\d+)$/.exec(note);
    if (!match) return null;
    const accidental = match[2] === '#' ? 1 : match[2] === 'b' ? -1 : 0;
    return 12 * (Number(match[3]) + 1) + NOTE_TO_MIDI[match[1]] + accidental;
  };
  const freq = (midi) => 440 * (2 ** ((midi - 69) / 12));
  const tuneNotes = (tune) => {
    const notes = tune.melody.split(/\s+/);
    const beats = tune.beats.split(/\s+/);
    return notes.map((note, idx) => {
      const midi = toMidi(note);
      return { note, midi, frequency: midi == null ? 0 : freq(midi), beat: Number(beats[idx] || 1) };
    });
  };

  const findAudioContext = () => {
    const AudioCtor = window.AudioContext || window.webkitAudioContext;
    return AudioCtor ? safeObjectValues(window).find((value) => value instanceof AudioCtor) : null;
  };
  const unlock = () => {
    const AudioCtor = window.AudioContext || window.webkitAudioContext;
    window.__drumRhythmAudioContext = window.__drumRhythmAudioContext || (AudioCtor ? new AudioCtor() : null);
    [window.__drumRhythmAudioContext, findAudioContext()].filter(Boolean).forEach((ctx) => ctx.state === 'suspended' && ctx.resume());
  };
  ['pointerdown', 'keydown', 'gamepadconnected', 'touchstart', 'click'].forEach((eventName) => window.addEventListener(eventName, unlock, { passive: true }));

  const padSound = (index = 0) => {
    unlock();
    const ctx = window.__drumRhythmAudioContext;
    if (!ctx) return;
    const now = ctx.currentTime;
    const osc = ctx.createOscillator();
    const gain = ctx.createGain();
    osc.type = ['sine', 'triangle', 'square', 'sawtooth'][index % 4];
    osc.frequency.setValueAtTime([110, 146.83, 196, 246.94, 329.63, 392][index % 6], now);
    gain.gain.setValueAtTime(0.24, now);
    gain.gain.exponentialRampToValueAtTime(0.001, now + 0.13);
    osc.connect(gain).connect(ctx.destination);
    osc.start(now);
    osc.stop(now + 0.14);
  };
  window.ubuntuPostInstallDrumPadSound = padSound;

  document.addEventListener('pointerdown', (event) => {
    const pad = event.target.closest('[data-pad], .pad, .drum-pad, button');
    if (!pad || /play|start|stop|pause|song/i.test(pad.textContent || '')) return;
    padSound([...document.querySelectorAll('[data-pad], .pad, .drum-pad, button')].indexOf(pad));
  }, true);

  const normalize = (name) => String(name || '').toLowerCase().replace(/[^a-z0-9]+/g, ' ').trim();
  const safeObjectValues = (object) => Object.keys(object).flatMap((key) => {
    try {
      return [object[key]];
    } catch (_error) {
      return [];
    }
  });
  const safeWindowObjects = () => safeObjectValues(window).filter((value) => value && typeof value === 'object');
  const patchSongs = () => {
    for (const root of [window, ...safeWindowObjects()]) {
      for (const key of Object.keys(root)) {
        let list;
        try {
          list = root[key];
        } catch (_error) {
          continue;
        }
        if (!Array.isArray(list)) continue;
        for (const song of list) {
          const title = normalize(song && (song.title || song.name));
          const tuneKey = Object.keys(CATEGORY_TUNES).find((candidate) => title.includes(candidate));
          if (!tuneKey) continue;
          const tune = CATEGORY_TUNES[tuneKey];
          song.title = song.title || tune.title;
          song.name = song.name || tune.title;
          song.bpm = tune.bpm;
          song.notes = tuneNotes(tune);
          song.melody = tune.melody;
          song.beats = tune.beats;
        }
      }
    }
  };
  window.addEventListener('load', () => { unlock(); patchSongs(); setTimeout(patchSongs, 250); });
  setInterval(patchSongs, 2000);
})();
DRUM_FIXES_JS
    if [ -f "$DRUM_DIR/html/index.html" ] && ! grep -q "ubuntu-post-install-fixes.js" "$DRUM_DIR/html/index.html"; then
        sed -i 's#</body>#  <script src="ubuntu-post-install-fixes.js"></script>\n</body>#' "$DRUM_DIR/html/index.html"
    fi

    chown -R "$ACTUAL_USER:$ACTUAL_USER" "$DRUM_DIR/html"

    # 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

    cat > docker-compose.yml << DRUM_COMPOSE
name: drum-rhythm-game

services:
  drum-rhythm-game:
    build:
      context: ./html
    container_name: drum-rhythm-game
    hostname: drum-rhythm-game
    restart: unless-stopped
    ports:
      - "${WEB_PORT}:80"
${_CADDY_NET_BLOCK}${_CADDY_NET_SECTION}
DRUM_COMPOSE

    cat > .env << DRUM_ENV
CADDY_NET=${SITE_CADDY_NET}
DRUM_ENV

    ensure_docker_dir_ownership "$DRUM_DIR"
    log_success "drum-rhythm-game configured at $DRUM_DIR"

    # No built-in auth — offer Authelia SSO protection
    local DRUM_EXTRA_BLOCK=""
    if [ -d "$DOCKER_DIR/authelia" ]; then
        local _use_auth=""
        prompt_yn "Protect drum-rhythm-game with Authelia SSO? (y/n):" "y" _use_auth
        [[ "$_use_auth" =~ ^[Yy]$ ]] && DRUM_EXTRA_BLOCK="    import authelia"
    fi
    configure_caddy_for_service "Drum Rhythm Game" "drum-rhythm-game:80" "drums" "$DRUM_EXTRA_BLOCK"

    write_readme "$DRUM_DIR" << MD
# Drum Rhythm Game

Browser-based drum rhythm game — 18 genres covering 119 synth-orchestra
songs (nursery rhymes, sea shanties, Christmas, folk, spirituals, world,
ragtime, classical, video game themes, chiptune originals) plus 120 drum
beat patterns across 8 genres (rock, metal, jazz, hip hop, funk, latin,
electronic, country). Supports keyboard, Wii/Xbox/PS Rock Band drums,
Guitar Hero drums, or any USB gamepad via the in-game Remap Pads button.
Multiplayer take-turns mode, adjustable speed/volume, and a leaderboard —
all state lives in browser localStorage. No server required; all audio is
synthesized in-browser via the Web Audio API.

Built and served from the repo's own \`Dockerfile\` (nginx + gzip + a
\`/healthz\` endpoint) — only \`index.html\` ends up in the image, so the
repo's docs/license/dev files never get served.

Source: https://github.com/outis1one/drum-rhythm-game

## Access
- URL: http://localhost:${WEB_PORT}

## Manage
\`\`\`bash
cd ~/docker/drum-rhythm-game
docker compose up -d      # start
docker compose down       # stop
docker compose logs -f    # logs
\`\`\`

## Update game
\`\`\`bash
cd ~/docker/drum-rhythm-game
git -C html pull
docker compose up -d --build
\`\`\`
MD

    local START_DRUM=""
    prompt_yn "Start drum-rhythm-game now? (y/n):" "y" START_DRUM
    if [ "$START_DRUM" = "y" ] || [ "$START_DRUM" = "Y" ]; then
        docker compose up -d --build \
            && log_success "Drum Rhythm Game started — http://localhost:${WEB_PORT}" \
            || log_warning "Start failed — check: docker compose logs"
    fi

    echo ""
    echo "  URL:         http://localhost:8096"
    echo "  Controls:    keyboard, USB Rock Band/Guitar Hero drums, or any USB gamepad (Remap Pads in-game)"
    echo "  Update:      git -C $DRUM_DIR/html pull && docker compose -f $DRUM_DIR/docker-compose.yml up -d --build"
    echo ""
}

[[ "${_RUN_STANDALONE:-0}" == 1 ]] && install_drum-rhythm-game
