#!/usr/bin/env bash
set -euo pipefail

# -------- Konfiguration -------------------------------------------------------
APP_USER="${APP_USER:-mailwolt}"
APP_GROUP="${APP_GROUP:-www-data}"        # Fallback; setz das in deiner Umgebung falls anders
APP_DIR="${APP_DIR:-/var/www/mailwolt}"
BRANCH="${BRANCH:-main}"                  # nur relevant bei UPDATE_MODE=branch
MODE="${UPDATE_MODE:-tags}"               # tags | branch
ALLOW_DIRTY="${ALLOW_DIRTY:-0}"           # 1 = Dirty-Working-Tree zulassen

# npm / CI Defaults für weniger Lärm
export CI=1
export NPM_CONFIG_FUND=false
export NPM_CONFIG_AUDIT=false
export npm_config_loglevel=warn

# -------- Helper --------------------------------------------------------------
as_app(){ sudo -u "$APP_USER" -H bash -lc "$*"; }

restart_if_exists(){
  local u="$1"
  systemctl list-unit-files | grep -q "^${u}\.service" && systemctl restart "$u" || true
}

reload_if_active(){
  local u="$1"
  systemctl is-active --quiet "$u" && systemctl reload "$u" || true
}

restart_php_fpm(){
  for u in php8.3-fpm php8.2-fpm php8.1-fpm php-fpm; do
    if systemctl list-unit-files | grep -q "^${u}\.service"; then
      systemctl restart "$u"
      return 0
    fi
  done
}

git_safe(){
  # Falls nötig: Repo als safe markieren (z.B. wenn Root den Wrapper aufruft)
  as_app "git -C ${APP_DIR} config --global --add safe.directory ${APP_DIR} >/dev/null 2>&1 || true"
}

git_dirty_check(){
  if [[ "$ALLOW_DIRTY" != "1" ]]; then
    local dirty
    dirty="$(as_app "git -C ${APP_DIR} status --porcelain")"
    if [[ -n "$dirty" ]]; then
      echo "[!] Arbeitsbaum hat uncommitted Änderungen. Abbruch (ALLOW_DIRTY=1 zum Überschreiben)."
      exit 2
    fi
  fi
}

get_version(){
  as_app "cd ${APP_DIR} && (git describe --tags --always 2>/dev/null || git rev-parse --short=7 HEAD)"
}

write_build_info(){
  local ver="$1" rev="$2"
  install -d -m 0755 /etc/mailwolt || true
  printf "version=%s\nrev=%s\nupdated=%s\n" "$ver" "$rev" "$(date -Is)" > /etc/mailwolt/build.info || true
}

# --- Frontend build (quiet & robust) ------------------------------------------
frontend_build_quiet() {
  local LOG="/var/log/mailwolt-frontend-build.log"
  local NPM_ENV="CI=1 NPM_CONFIG_FUND=false NPM_CONFIG_AUDIT=false npm_config_loglevel=warn"

  # Logfile vorbereiten
  install -d -m 0755 "$(dirname "$LOG")"
  : > "$LOG" || true
  chmod 0644 "$LOG"

  echo "[i] Frontend: vorbereiten …"
  # Build-Ziele & Temp besitzbar machen
  as_app "mkdir -p '${APP_DIR}/public/build' '${APP_DIR}/node_modules' '${APP_DIR}/.vite' '${APP_DIR}/.npm-cache'"
  chown -R "$APP_USER":"$APP_GROUP" "${APP_DIR}/public/build" "${APP_DIR}/node_modules" "${APP_DIR}/.vite" "${APP_DIR}/.npm-cache" || true
  chmod -R g+rwX "${APP_DIR}/public/build" "${APP_DIR}/node_modules" "${APP_DIR}/.vite" || true

  # evtl. störrische Reste entfernen (vermeidet EACCES beim Unlink/Rimraf)
  rm -rf "${APP_DIR}/node_modules/.vite" "${APP_DIR}/public/build/"* 2>/dev/null || true

  # npm Config (kein Fund/Audit, eigener Cache unter App-User)
  as_app "printf 'fund=false\naudit=false\ncache=${APP_DIR}/.npm-cache\n' > ~/.npmrc" >>"$LOG" 2>&1 || true

  echo "[i] Frontend: Dependencies … (Details: $LOG)"
  if ! as_app "cd '${APP_DIR}' && ${NPM_ENV} npm ci --no-audit --no-fund --no-progress" >>"$LOG" 2>&1; then
    if ! as_app "cd '${APP_DIR}' && ${NPM_ENV} npm install --no-audit --no-fund --no-progress" >>"$LOG" 2>&1; then
      echo "[!] npm install fehlgeschlagen. Letzte 60 Zeilen:"
      tail -n 60 "$LOG" || true
      return 1
    fi
  fi

  echo "[i] Frontend: Build … (Details: $LOG)"
  if ! as_app "cd '${APP_DIR}' && ${NPM_ENV} npm run build --silent --loglevel=warn" >>"$LOG" 2>&1; then
    echo "[!] Build fehlgeschlagen. Letzte 80 Zeilen:"
    tail -n 80 "$LOG" || true
    return 1
  fi

  # Nach dem Build noch einmal Rechte begradigen
  chown -R "$APP_USER":"$APP_GROUP" "${APP_DIR}/public/build" || true
  find "${APP_DIR}/public/build" -type d -exec chmod 2775 {} \; 2>/dev/null || true
  find "${APP_DIR}/public/build" -type f -exec chmod 0664 {} \; 2>/dev/null || true

  echo "[✓] Frontend gebaut."
}

# -------- Guards --------------------------------------------------------------
[[ "$(id -u)" -eq 0 ]] || { echo "[!] Bitte als root ausführen"; exit 1; }
[[ -d "$APP_DIR/.git" ]] || { echo "[!] $APP_DIR scheint kein Git-Repo zu sein"; exit 1; }

git_safe
git_dirty_check

# -------- Git: neuen Stand holen ---------------------------------------------
echo "[i] Prüfe Repository …"
OLD_REV="$(as_app "git -C ${APP_DIR} rev-parse HEAD")"
OLD_VER="$(get_version)"
NEW_REV="$OLD_REV"

if [[ "$MODE" = "tags" ]]; then
  # → Neueste Tags holen
  as_app "git -C ${APP_DIR} fetch --quiet origin && git -C ${APP_DIR} fetch --tags --quiet origin || true"
  LATEST_TAG="$(as_app "git -C ${APP_DIR} tag --list | sort -V | tail -n1")"
  if [[ -z "$LATEST_TAG" ]]; then
    echo "[!] Keine Tags gefunden – falle auf origin/${BRANCH} zurück"
    as_app "git -C ${APP_DIR} checkout -q ${BRANCH} && git -C ${APP_DIR} pull --ff-only origin ${BRANCH}"
  else
    TARGET_REV="$(as_app "git -C ${APP_DIR} rev-list -n1 ${LATEST_TAG}")"
    if [[ "$TARGET_REV" = "$OLD_REV" ]]; then
      echo "[✓] Bereits auf neuestem Release (${LATEST_TAG}) – nichts zu tun."
      write_build_info "$(get_version)" "$OLD_REV"
      exit 0
    fi
    echo "[i] Checkout auf Release ${LATEST_TAG} (${TARGET_REV:0:7}) …"
    as_app "git -C ${APP_DIR} checkout -q ${LATEST_TAG}"
  fi
  NEW_REV="$(as_app "git -C ${APP_DIR} rev-parse HEAD")"
else
  # Rolling: branch folgen
  as_app "git -C ${APP_DIR} fetch --quiet origin ${BRANCH}"
  BEHIND="$(as_app "git -C ${APP_DIR} rev-list --count HEAD..origin/${BRANCH} || echo 0")"
  if [[ "$BEHIND" -eq 0 ]]; then
    echo "[✓] Branch origin/${BRANCH} ist bereits aktuell – nichts zu tun."
    write_build_info "$(get_version)" "$OLD_REV"
    exit 0
  fi
  echo "[i] Es gibt ${BEHIND} neue Commit(s) – ziehe Änderungen …"
  as_app "git -C ${APP_DIR} checkout -q ${BRANCH} && git -C ${APP_DIR} pull --ff-only origin ${BRANCH}"
  NEW_REV="$(as_app "git -C ${APP_DIR} rev-parse HEAD")"
fi

# -------- Änderungstypen ermitteln -------------------------------------------
CHANGED_FILES="$(as_app "git -C ${APP_DIR} diff --name-only ${OLD_REV}..${NEW_REV}")"

NEED_COMPOSER=0
NEED_MIGRATIONS=0
NEED_FRONTEND=0
NEED_PHP_RESTART=0

echo "$CHANGED_FILES" | grep -qE '(^|/)composer\.(json|lock)$'                                    && NEED_COMPOSER=1
echo "$CHANGED_FILES" | grep -qE '^database/migrations/'                                           && NEED_MIGRATIONS=1
echo "$CHANGED_FILES" | grep -qE '^(package(-lock)?\.json|vite\.config(\.ts|\.js)?|resources/|public/.*\.(js|css))' && NEED_FRONTEND=1
echo "$CHANGED_FILES" | grep -qE '^(app/|routes/|config/|resources/views/)'                        && NEED_PHP_RESTART=1

echo "[i] Zusammenfassung:"
echo "    Composer     : $([[ $NEED_COMPOSER   -eq 1 ]] && echo JA || echo nein)"
echo "    Migrations   : $([[ $NEED_MIGRATIONS -eq 1 ]] && echo JA || echo nein)"
echo "    Frontend     : $([[ $NEED_FRONTEND   -eq 1 ]] && echo JA || echo nein)"
echo "    PHP restart  : $([[ $NEED_PHP_RESTART -eq 1 ]] && echo JA || echo nein)"

# Wenn gar nichts relevantes geändert wurde → sauber beenden
if [[ $NEED_COMPOSER -eq 0 && $NEED_MIGRATIONS -eq 0 && $NEED_FRONTEND -eq 0 && $NEED_PHP_RESTART -eq 0 ]]; then
  echo "[✓] Code-Stand aktualisiert, aber keine Build/Runtime-Änderungen – keine Neustarts nötig."
  NEW_VER="$(get_version)"
  write_build_info "$NEW_VER" "$NEW_REV"
  echo "[i] Version: ${OLD_VER} → ${NEW_VER}"
  exit 0
fi

# -------- Gezielter Build/Deploy ---------------------------------------------
if [[ $NEED_COMPOSER -eq 1 ]]; then
  echo "[i] Composer …"
  as_app "cd ${APP_DIR} && composer install --no-interaction --prefer-dist --optimize-autoloader"
fi

if [[ $NEED_MIGRATIONS -eq 1 ]]; then
  echo "[i] DB-Migrationen …"
  as_app "cd ${APP_DIR} && php artisan migrate --force"
fi

if [[ $NEED_PHP_RESTART -eq 1 || $NEED_COMPOSER -eq 1 || $NEED_MIGRATIONS -eq 1 ]]; then
  echo "[i] Cache/Optimierungen …"
  as_app "cd ${APP_DIR} && php artisan config:cache && php artisan route:cache || true"
  as_app "cd ${APP_DIR} && php artisan queue:restart || true"
  as_app "cd ${APP_DIR} && php artisan optimize:clear || true"
fi

# -------- Frontend: nur wenn nötig -------------------------------------------
if [[ $NEED_FRONTEND -eq 1 ]]; then
  echo "[i] Frontend-Änderungen erkannt – baue Assets …"
  if ! frontend_build_quiet; then
    echo "[!] Frontend-Build ist fehlgeschlagen (siehe /var/log/mailwolt-frontend-build.log)."
    exit 1
  fi
fi

# -------- Dienste nur wenn nötig ---------------------------------------------
echo "[i] Dienste neu laden/neustarten (gezielt) …"
if [[ $NEED_PHP_RESTART -eq 1 || $NEED_COMPOSER -eq 1 || $NEED_MIGRATIONS -eq 1 ]]; then
  restart_php_fpm
  restart_if_exists "${APP_USER}-queue"
  restart_if_exists "${APP_USER}-schedule"
  restart_if_exists "${APP_USER}-ws"
fi
if [[ $NEED_FRONTEND -eq 1 || $NEED_PHP_RESTART -eq 1 ]]; then
  reload_if_active nginx
fi

# -------- Build-Info ablegen --------------------------------------------------
NEW_VER="$(get_version)"
write_build_info "$NEW_VER" "$NEW_REV"

echo "[✓] Update abgeschlossen: ${OLD_REV:0:7} → ${NEW_REV:0:7} (Version: ${NEW_VER})"