import 'dart:io';
import 'package:permission_handler/permission_handler.dart';

class AppPermission {
  // 检查权限
  static Future<bool> checkPermission({required Permission permission}) async {
    var status = await permission.status;
    return status == PermissionStatus.granted;
  }

  // 批量检查权限
  static Future<bool> checkPermissions({
    required List<Permission> permissions,
  }) async {
    if (permissions.isEmpty) return false;
    Map<Permission, PermissionStatus> statuses = await permissions.request();
    for (var status in statuses.values) {
      if (status != PermissionStatus.granted) {
        return false;
      }
    }
    return true;
  }

  static Future<bool> requestPermission({
    required Permission permission,
  }) async {
    var status = await permission.request();
    return status == PermissionStatus.granted;
  }

  static Future<bool> requestNotificationPermission() async {
    final PermissionStatus status = await Permission.notification.request();

    if (status == PermissionStatus.granted) {
      print("通知权限已授予");
      return true;
    } else if (status == PermissionStatus.denied) {
      // 第一次被拒绝，可以再次请求
      return false;
    } else if (status.isPermanentlyDenied) {
      // 用户勾选了“不再提示”或被永久拒绝
      print("权限被永久拒绝，跳转到设置页面");
      openAppSettings(); // 跳转到应用设置页，手动开启
      return false;
    }

    return false;
  }

  // 请求蓝牙权限（Android 12及以上需要）
  static Future<bool> requestBluetoothPermissions() async {
    try {
      // Android 12及以上需要的蓝牙权限
      List<Permission> bluetoothPermissions = [];

      if (Platform.isAndroid) {
        // Android 12+ 需要细分权限
        if (Platform.version.startsWith('Android 12') || Platform.isAndroid) {
          bluetoothPermissions = [
            Permission.bluetoothScan,
            Permission.bluetoothConnect,
            Permission.bluetoothAdvertise,
          ];
        } else {
          // Android 11 及以下
          bluetoothPermissions = [
            Permission.bluetooth,
            Permission.location, // 扫描 BLE 可能需要位置
          ];
        }
      } else if (Platform.isIOS) {
        // iOS 只需要通用 bluetooth 权限
        bluetoothPermissions = [
          Permission.bluetooth,
        ];
      }

      // Android 12以下需要的位置权限
      List<Permission> locationPermissions = [
        Permission.location,
        Permission.locationWhenInUse,
      ];

      bool bluetoothGranted = true;
      bool locationGranted = true;

      // 检查并请求蓝牙权限（Android 12+）
      Map<Permission, PermissionStatus> bluetoothStatuses = await bluetoothPermissions.request();
      for (var status in bluetoothStatuses.values) {
        if (status != PermissionStatus.granted) {
          bluetoothGranted = false;
          break;
        }
      }

      // 检查并请求位置权限（Android 12以下或蓝牙扫描需要）
      Map<Permission, PermissionStatus> locationStatuses = await locationPermissions.request();
      for (var status in locationStatuses.values) {
        if (status != PermissionStatus.granted) {
          locationGranted = false;
          break;
        }
      }

      bool hasPermission = bluetoothGranted && locationGranted;

      if (hasPermission) {
        print("蓝牙权限已授予");
      } else {
        print("蓝牙权限被拒绝");
      }

      return hasPermission;
    } catch (e) {
      print("请求蓝牙权限失败: $e");
      return false;
    }
  }

  // 检查蓝牙扫描权限
  static Future<bool> checkBluetoothScanPermission() async {
    try {
      var status = await Permission.bluetoothScan.status;
      return status == PermissionStatus.granted;
    } catch (e) {
      // 如果权限不存在（Android 12以下），检查位置权限
      return await checkLocationPermission();
    }
  }

  // 检查蓝牙连接权限
  static Future<bool> checkBluetoothConnectPermission() async {
    try {
      var status = await Permission.bluetoothConnect.status;
      return status == PermissionStatus.granted;
    } catch (e) {
      // 如果权限不存在（Android 12以下），默认返回true
      print("蓝牙连接权限检查失败，可能是Android 12以下版本: $e");
      return true;
    }
  }

  // 检查蓝牙广播权限
  static Future<bool> checkBluetoothAdvertisePermission() async {
    try {
      var status = await Permission.bluetoothAdvertise.status;
      return status == PermissionStatus.granted;
    } catch (e) {
      // 如果权限不存在（Android 12以下），默认返回true
      print("蓝牙广播权限检查失败，可能是Android 12以下版本: $e");
      return true;
    }
  }

  // 检查位置权限（Android 12以下蓝牙扫描需要）
  static Future<bool> checkLocationPermission() async {
    var status = await Permission.location.status;
    return status == PermissionStatus.granted;
  }

  // 请求位置权限
  static Future<bool> requestLocationPermission() async {
    try {
      final PermissionStatus status = await Permission.location.request();

      if (status == PermissionStatus.granted) {
        print("位置权限已授予");
        return true;
      } else if (status == PermissionStatus.denied) {
        print("位置权限被拒绝");
        return false;
      } else if (status.isPermanentlyDenied) {
        print("位置权限被永久拒绝，跳转到设置页面");
        return false;
      }

      return false;
    } catch (e) {
      print("请求位置权限失败: $e");
      return false;
    }
  }

  // 检查所有蓝牙相关权限
  static Future<bool> checkAllBluetoothPermissions() async {
    if (Platform.isIOS) {
      // iOS主要检查位置权限，蓝牙权限由系统自动处理
      bool locationPermission = await checkLocationPermission();
      return locationPermission;
    } else {
      // Android检查所有相关权限
      bool scanPermission = await checkBluetoothScanPermission();
      bool connectPermission = await checkBluetoothConnectPermission();
      bool advertisePermission = await checkBluetoothAdvertisePermission();
      bool locationPermission = await checkLocationPermission();

      return scanPermission && connectPermission && advertisePermission && locationPermission;
    }
  }
}