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

SERVICE_NAME="BackItUp.service"
PROJECT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
USER_SYSTEMD_DIR="${HOME}/.config/systemd/user"
TARGET_SERVICE_FILE="${USER_SYSTEMD_DIR}/${SERVICE_NAME}"
SOURCE_SERVICE_FILE="${PROJECT_DIR}/deploy/systemd/${SERVICE_NAME}"

usage() {
  cat <<EOF
Usage: ./scripts/service.sh <command>

Commands:
  install   Install service for current user and reload daemon
  start     Start service
  stop      Stop service
  restart   Restart service
  status    Show service status
  logs      Follow service logs
  enable    Enable autostart on login
  disable   Disable autostart on login
EOF
}

ensure_venv() {
  if [[ ! -x "${PROJECT_DIR}/.venv/bin/python" ]]; then
    echo "[INFO] Erzeuge .venv..."
    python3 -m venv "${PROJECT_DIR}/.venv"
  fi

  echo "[INFO] Installiere/aktualisiere Abhaengigkeiten..."
  "${PROJECT_DIR}/.venv/bin/python" -m pip install -r "${PROJECT_DIR}/requirements.txt"
}

install_service() {
  mkdir -p "${USER_SYSTEMD_DIR}"
  cp "${SOURCE_SERVICE_FILE}" "${TARGET_SERVICE_FILE}"
  systemctl --user daemon-reload
  echo "[OK] Service installiert: ${TARGET_SERVICE_FILE}"
}

case "${1:-}" in
  install)
    ensure_venv
    install_service
    ;;
  start)
    systemctl --user start "${SERVICE_NAME}"
    echo "[OK] Service gestartet"
    ;;
  stop)
    systemctl --user stop "${SERVICE_NAME}"
    echo "[OK] Service gestoppt"
    ;;
  restart)
    systemctl --user restart "${SERVICE_NAME}"
    echo "[OK] Service neugestartet"
    ;;
  status)
    systemctl --user status "${SERVICE_NAME}" --no-pager
    ;;
  logs)
    journalctl --user -u "${SERVICE_NAME}" -f
    ;;
  enable)
    systemctl --user enable "${SERVICE_NAME}"
    echo "[OK] Autostart aktiviert"
    ;;
  disable)
    systemctl --user disable "${SERVICE_NAME}"
    echo "[OK] Autostart deaktiviert"
    ;;
  *)
    usage
    exit 1
    ;;
esac