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

CONFIG_FILE="${JETBOARD_CONFIG:-/etc/jetboard.conf}"
APP_DIR="${JBOARD_APP_DIR:-${APP_DIR:-}}"
SERVICE_NAME="${JBOARD_SERVICE_NAME:-jetboard}"
SERVICE_USER="${JBOARD_SERVICE_USER:-jetboard}"
BACKUP_ROOT="${BACKUP_ROOT:-/root}"
UNINSTALL_CONFIRM="${UNINSTALL_CONFIRM:-}"

if [ -z "$APP_DIR" ] && [ -r "$CONFIG_FILE" ]; then
  # shellcheck disable=SC1090
  . "$CONFIG_FILE"
  APP_DIR="${JBOARD_APP_DIR:-${APP_DIR:-}}"
  SERVICE_NAME="${JBOARD_SERVICE_NAME:-${SERVICE_NAME:-jetboard}}"
  SERVICE_USER="${JBOARD_SERVICE_USER:-${SERVICE_USER:-jetboard}}"
fi

APP_DIR="${APP_DIR:-/opt/jboard}"

is_interactive() {
  [ -r /dev/tty ] && [ -w /dev/tty ]
}

prompt_print() {
  if is_interactive; then
    printf '%b' "$*" > /dev/tty
  else
    printf '%b' "$*" >&2
  fi
}

prompt_read() {
  local __var="$1"
  if is_interactive; then
    IFS= read -r "$__var" < /dev/tty || true
  else
    return 1
  fi
}

run_as_root() {
  if [ "$(id -u)" -eq 0 ]; then
    "$@"
  elif command -v sudo >/dev/null 2>&1; then
    sudo "$@"
  else
    echo "需要 root 权限。请使用 root 用户运行，或先安装 sudo。" >&2
    exit 1
  fi
}

line() {
  printf '%s\n' "------------------------------------------------------------"
}

section() {
  echo
  line
  printf '%s\n' "$1"
  line
}

confirm_uninstall() {
  if [ "$UNINSTALL_CONFIRM" = "YES" ]; then
    return
  fi

  if ! is_interactive; then
    echo "非交互卸载请设置 UNINSTALL_CONFIRM=YES。" >&2
    exit 1
  fi

  section "确认卸载 J-Board Lite standalone"
  printf '将停止并删除服务：%s\n' "$SERVICE_NAME"
  printf '将删除安装目录：%s\n' "$APP_DIR"
  printf '将删除命令：/usr/local/bin/jetboard、/usr/local/bin/JetBoard\n'
  printf '将删除配置：%s\n' "$CONFIG_FILE"
  echo "卸载前会尝试备份 .env 和 storage 到 ${BACKUP_ROOT}。"
  echo
  prompt_print "请输入 YES 确认卸载: "
  local answer=""
  prompt_read answer || true
  if [ "$answer" != "YES" ]; then
    echo "已取消卸载。"
    exit 0
  fi
}

backup_before_remove() {
  if [ ! -d "$APP_DIR" ]; then
    echo "安装目录不存在，跳过备份：$APP_DIR"
    return
  fi

  local backup_dir backup_file
  backup_dir="${BACKUP_ROOT%/}/jboard-uninstall-backup-$(date +%F-%H%M%S)"
  backup_file="${backup_dir}.tar.gz"

  run_as_root mkdir -p "$backup_dir"
  if [ -f "$APP_DIR/.env" ]; then
    run_as_root cp "$APP_DIR/.env" "$backup_dir/.env"
  fi
  if [ -d "$APP_DIR/storage" ]; then
    run_as_root cp -R "$APP_DIR/storage" "$backup_dir/storage"
  fi
  if [ -d "$APP_DIR/backups" ]; then
    run_as_root cp -R "$APP_DIR/backups" "$backup_dir/backups"
  fi

  run_as_root tar -C "$(dirname "$backup_dir")" -czf "$backup_file" "$(basename "$backup_dir")"
  run_as_root rm -rf "$backup_dir"
  echo "卸载备份已保存：$backup_file"
}

remove_service() {
  section "删除 systemd 服务"
  if command -v systemctl >/dev/null 2>&1; then
    run_as_root systemctl stop "$SERVICE_NAME" >/dev/null 2>&1 || true
    run_as_root systemctl disable "$SERVICE_NAME" >/dev/null 2>&1 || true
  fi
  run_as_root rm -f "/etc/systemd/system/${SERVICE_NAME}.service"
  if command -v systemctl >/dev/null 2>&1; then
    run_as_root systemctl daemon-reload || true
    run_as_root systemctl reset-failed "$SERVICE_NAME" >/dev/null 2>&1 || true
  fi
}

remove_files() {
  section "删除文件"
  run_as_root rm -f /usr/local/bin/jetboard /usr/local/bin/JetBoard
  run_as_root rm -f "$CONFIG_FILE"
  run_as_root rm -rf "$APP_DIR"
}

remove_user() {
  section "删除运行用户"
  if id "$SERVICE_USER" >/dev/null 2>&1; then
    if command -v userdel >/dev/null 2>&1; then
      run_as_root userdel "$SERVICE_USER" >/dev/null 2>&1 || true
    elif command -v deluser >/dev/null 2>&1; then
      run_as_root deluser "$SERVICE_USER" >/dev/null 2>&1 || true
    fi
  fi
}

main() {
  confirm_uninstall
  backup_before_remove
  remove_service
  remove_files
  remove_user

  echo
  echo "J-Board Lite standalone 已卸载。"
}

main "$@"