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

SERVICE_NAME="vmess-domain-rotator"
APP_DIR="/opt/vmess-domain-rotator"
KEEP_APP_DIR="0"
REMOVE_USER="0"
RUN_USER="vmessrotator"

usage() {
  cat <<'EOF'
Usage: sudo bash scripts/uninstall_debian.sh [options]

Options:
  --app-dir <path>         Install directory (default: /opt/vmess-domain-rotator)
  --service-name <name>    Service base name (default: vmess-domain-rotator)
  --keep-app-dir           Keep install directory and files
  --remove-user <name>     Remove this service user after uninstall
  -h, --help               Show help

Examples:
  sudo bash scripts/uninstall_debian.sh
  sudo bash scripts/uninstall_debian.sh --keep-app-dir
  sudo bash scripts/uninstall_debian.sh --remove-user vmessrotator
EOF
}

while [[ $# -gt 0 ]]; do
  case "$1" in
    --app-dir)
      APP_DIR="$2"
      shift 2
      ;;
    --service-name)
      SERVICE_NAME="$2"
      shift 2
      ;;
    --keep-app-dir)
      KEEP_APP_DIR="1"
      shift
      ;;
    --remove-user)
      REMOVE_USER="1"
      RUN_USER="$2"
      shift 2
      ;;
    -h|--help)
      usage
      exit 0
      ;;
    *)
      echo "Unknown option: $1" >&2
      usage
      exit 1
      ;;
  esac
done

if [[ "$(id -u)" -ne 0 ]]; then
  echo "Please run as root (use sudo)." >&2
  exit 1
fi

if systemctl list-unit-files | grep -q "^${SERVICE_NAME}.timer"; then
  systemctl disable --now "${SERVICE_NAME}.timer" || true
fi

if systemctl list-unit-files | grep -q "^${SERVICE_NAME}.service"; then
  systemctl stop "${SERVICE_NAME}.service" || true
fi

rm -f "/etc/systemd/system/${SERVICE_NAME}.service"
rm -f "/etc/systemd/system/${SERVICE_NAME}.timer"

systemctl daemon-reload
systemctl reset-failed

if [[ "$KEEP_APP_DIR" != "1" ]]; then
  rm -rf "$APP_DIR"
fi

if [[ "$REMOVE_USER" == "1" ]]; then
  if id -u "$RUN_USER" >/dev/null 2>&1; then
    userdel "$RUN_USER" || true
  fi
fi

echo "Uninstall completed."
if [[ "$KEEP_APP_DIR" == "1" ]]; then
  echo "Kept app directory: ${APP_DIR}"
else
  echo "Removed app directory: ${APP_DIR}"
fi