import 'package:app_settings/app_settings.dart';
import 'package:get/get.dart';
import 'dart:async';
import 'package:permission_handler/permission_handler.dart';
import '../../../routes/app_routes.dart';
import '../../../core/utils/logger.dart';
import 'dart:io';
import 'package:classic_bluetooth/classic_bluetooth.dart';

/// 配对控制器，负责检查蓝牙权限、状态，并处理配对流程
class PairingController extends GetxController {
  static PairingController get to => Get.find();

  // 状态标志
  final isLoading = false.obs;
  
  // 权限是否已授予
  final _hasPermissions = false.obs;
  bool get hasPermissions => _hasPermissions.value;

  // 蓝牙状态
  final _bluetoothState = 'unknown'.obs;
  String get bluetoothState => _bluetoothState.value;
  
  // 状态描述（用于UI显示）
  final statusDescription = 'initializing'.tr.obs;

  // 是否正在跳转到主页
  bool _isNavigatingToHome = false;

  // 当前连接设备
  final Rx<BluetoothDevice?> _currentDevice = Rx<BluetoothDevice?>(null);
  BluetoothDevice? get currentDevice => _currentDevice.value;

  // 蓝牙事件订阅
  StreamSubscription<BluetoothEvent>? _bluetoothSubscription;

  @override
  void onInit() {
    super.onInit();
    _initialize();
  }

  @override
  void onClose() {
    _bluetoothSubscription?.cancel();
    super.onClose();
  }

  /// 初始化流程
  Future<void> _initialize() async {
    try {
      isLoading.value = true;
      statusDescription.value = 'checkingPermissions'.tr;

      // 检查并请求权限
      if (!await _checkAndRequestPermissions()) {
        statusDescription.value = 'permissionDenied'.tr;
        return;
      }

      // 监听蓝牙状态变化
      _setupBluetoothListener();

      // 检查蓝牙状态
      statusDescription.value = 'checkingBluetoothStatus'.tr;
      final isEnabled = await ClassicBluetooth.isBluetoothEnabled();
      _bluetoothState.value = isEnabled ? 'on' : 'off';

      if (!isEnabled) {
        statusDescription.value = 'bluetoothTurnedOff'.tr;
        return;
      }

      // 刷新已连接设备
      statusDescription.value = 'searchingDevice'.tr;
      await refreshConnectedDevices();
    } catch (e) {
      Logger.error('初始化配对控制器失败: $e');
      statusDescription.value = 'initializationFailure'.tr;
    } finally {
      isLoading.value = false;
      _updateStatusDescription();
    }
  }

  /// 检查并请求必要的蓝牙权限
  Future<bool> _checkAndRequestPermissions() async {
    Map<Permission, PermissionStatus> statuses;
    List<Permission> permissionsToRequest = [];

    if (Platform.isAndroid) {
      // Android 12+ (SDK 31+) 需要 SCAN 和 CONNECT
      // Android 6+ (SDK 23+) 需要 LOCATION
      permissionsToRequest.add(Permission.locationWhenInUse); // 基本定位权限
      // Android 12及以上版本才需要请求蓝牙扫描和连接权限
      if (await _getAndroidSdkVersion() >= 31) {
        permissionsToRequest.add(Permission.bluetoothScan);
        permissionsToRequest.add(Permission.bluetoothConnect);
      }
    } else if (Platform.isIOS) {
      permissionsToRequest.add(Permission.bluetooth);
    }

    statuses = await permissionsToRequest.request();

    bool allGranted = true;
    statuses.forEach((permission, status) {
      if (!status.isGranted) {
        allGranted = false;
        Logger.warning('权限 ${permission.toString()} 未被授予: $status');
      }
    });
    
    _hasPermissions.value = allGranted;
    return allGranted;
  }
  
  // 辅助方法获取Android SDK版本
  Future<int> _getAndroidSdkVersion() async {
    if (Platform.isAndroid) {
        // 这里需要原生代码支持来获取确切的SDK版本，
        // 或者使用 device_info_plus 插件
        // 暂时返回一个较高值以触发新权限请求
        return 31; // 假设运行在需要新权限的设备上
    }
    return 0;
  }

  /// 设置蓝牙状态监听
  void _setupBluetoothListener() {
    _bluetoothSubscription?.cancel();
    
    try {
      _bluetoothSubscription = ClassicBluetooth.events.listen(
        (event) {
          if (event.type == 'stateChanged' && event.state != null) {
            _bluetoothState.value = event.state!;
            _updateStatusDescription();
            
            // 如果蓝牙关闭，清除设备
            if (event.state == 'off') {
              _currentDevice.value = null;
            }
          } else if (event.type == 'deviceConnected' && event.device != null) {
            // 直接从事件中获取设备信息
            final newDevice = event.device!;
            
            // 更新当前设备
            _currentDevice.value = newDevice;
            _updateStatusDescription();
            
            // 设备连接时自动跳转到主页
            _autoNavigateToHome();
          } else if (event.type == 'deviceDisconnected' && event.device != null) {
            // 直接从事件中获取设备信息
            final disconnectedDevice = event.device!;
            
            // 如果断开的是当前设备，清除当前设备
            if (_currentDevice.value?.address == disconnectedDevice.address) {
              _currentDevice.value = null;
            }
            _updateStatusDescription();
          }
        },
        onError: (error) {
          Logger.error('蓝牙事件流错误: $error');
        },
      );
    } catch (e) {
      Logger.error('设置蓝牙事件监听器失败: $e');
    }
  }

  /// 更新状态描述
  void _updateStatusDescription() {
    if (!hasPermissions) {
      statusDescription.value = 'permissionDenied'.tr;
      return;
    }
  
    if (bluetoothState == 'off') {
      statusDescription.value = 'bluetoothTurnedOff'.tr;
      return;
    }

    if (currentDevice != null) {
      statusDescription.value = '${'connectedDevice'.tr} ${currentDevice!.name}';
      return;
    }

    if (isLoading.value) {
      statusDescription.value = 'searchingDevice'.tr;
      return;
    }

    statusDescription.value = 'notFound'.tr;
  }

  /// 刷新已连接设备
  Future<void> refreshConnectedDevices() async {
    if (!hasPermissions) {
      statusDescription.value = 'permissionDenied'.tr;
      return;
    }
    
    try {
      isLoading.value = true;
      statusDescription.value = 'searchingDevice'.tr;
      
      // 获取已连接的蓝牙设备
      final devices = await ClassicBluetooth.getConnectedDevices();
      
      // 如果有设备则设置为当前设备
      if (devices.isNotEmpty) {
        _currentDevice.value = devices.first;
        _autoNavigateToHome();
      } else {
        _currentDevice.value = null;
      }
    } catch (e) {
      Logger.error('刷新设备失败: $e');
      statusDescription.value = 'failedRefreshDevice'.tr;
    } finally {
      isLoading.value = false;
      _updateStatusDescription();
    }
  }

  /// 自动跳转到主页
  void _autoNavigateToHome() {
    if (_isNavigatingToHome || currentDevice == null) return;
    
    _isNavigatingToHome = true;
    Logger.info('已找到连接的设备 ${currentDevice?.name}，自动跳转到主页');
    
    Future.delayed(const Duration(milliseconds: 500), () {
      Get.offAllNamed(Routes.home);
    });
  }

  /// 打开系统蓝牙设置
  void openBluetoothSettings() {
    try {
      if (!hasPermissions) {
        openAppSettings();
      } else if (Platform.isAndroid && bluetoothState == 'off') {
        AppSettings.openAppSettings(type: AppSettingsType.bluetooth);
      } else if (Platform.isIOS) {
        openAppSettings();
      } else {
        AppSettings.openAppSettings(type: AppSettingsType.bluetooth);
      }
    } catch (e) {
      Logger.error('打开设置失败: $e');
    }
  }
  
  /// 打开应用设置
  Future<void> openAppSettings() async {
    await AppSettings.openAppSettings();
  }

  /// 跳过连接
  void skipConnecting() {
    _isNavigatingToHome = true;
    Get.offAllNamed(Routes.home);
  }
}