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 '../../../data/services/bluetooth_manager.dart';
import 'package:classic_bluetooth/classic_bluetooth.dart' show BluetoothDevice;
import '../../../data/services/ble_manager.dart';
import 'package:ble_service/ble_service.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();

  // 需要设备
  final bool needdeivice = false;
  // 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;
  bool get isBluetoothOn => _bluetoothState.value == 'on';

  // 状态描述（用于UI显示）
  final statusDescription = 'initializing'.tr.obs;

  // 按钮文本
  final actionButtonText = '去系统设置'.obs;

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

  // 是否正在执行Companion关联流程
  bool _isAssociating = false;

  // 是否用户拒绝了关联
  final _userRejectedAssociation = false.obs;
  bool get userRejectedAssociation => _userRejectedAssociation.value;

  // 当前连接设备信息
  BluetoothDevice? get currentDevice => _bluetoothService.currentDevice;

  // 是否已连接设备
  bool get isDeviceConnected => currentDevice != null;

  // 是否已完成Companion关联
  final _companionAssociated = false.obs;
  bool get isCompanionAssociated => _companionAssociated.value;

  // 服务状态监听
  Worker? _bluetoothStateWorker;
  Worker? _deviceWorker;

  // 蓝牙服务
  final _bluetoothService = Get.find<BluetoothManager>();

  // BLE服务
  final _bleService = BleService();

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

  @override
  void onClose() {
    _bluetoothStateWorker?.dispose();
    _deviceWorker?.dispose();
    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;
        actionButtonText.value = '去系统设置';
        return;
      }

      // 设置服务状态监听
      _setupServiceListeners();

      // 检查蓝牙状态并刷新设备
      await _checkBluetoothAndRefresh();
    } catch (e) {
      Logger.error('初始化配对控制器失败: $e');
      statusDescription.value = 'initializationFailure'.tr;
    } finally {
      isLoading.value = false;
      _updateStatusDescription();
    }
  }

  /// 检查蓝牙状态并刷新设备
  Future<void> _checkBluetoothAndRefresh() async {
    statusDescription.value = 'checkingBluetoothStatus'.tr;
    final isEnabled = await _bluetoothService.isBluetoothEnabled();
    _bluetoothState.value = isEnabled ? 'on' : 'off';

    if (!isEnabled) {
      statusDescription.value = 'bluetoothTurnedOff'.tr;
      actionButtonText.value = '去系统设置';
      return;
    }

    // 刷新连接设备并检查配对状态
    statusDescription.value = 'searchingDevice'.tr;
    await _bluetoothService.refreshDeviceConnection();

    // 设备连接时检查配对状态
    if (isDeviceConnected) {
      await _checkDevicePairingStatus();
    }
  }

  /// 检查设备配对状态
  Future<void> _checkDevicePairingStatus() async {
    // 只在Android平台且设备已连接时执行
    if (!Platform.isAndroid || !isDeviceConnected) return;

    try {
      final isSupported = await _bleService.isCompanionSupported();
      if (!isSupported) {
        Logger.info('设备不支持Companion功能');
        _companionAssociated.value = true; // 不支持则视为已配对
        _userRejectedAssociation.value = false; // 重置拒绝状态
        return;
      }

      final pairedMac = await _bleService.getPairedMacAddress();
      if (pairedMac == null) {
        // 没有配对记录，需要开始配对
        Logger.info('无配对记录，需要开始设备配对');
        return;
      }

      Logger.info('发现已关联的Companion设备: $pairedMac');

      // 检查当前连接设备与已保存的设备是否一致
      if (currentDevice!.address != pairedMac) {
        // MAC地址不匹配
        Logger.warning('当前连接的设备与已配对的DeepSound设备不符');
        statusDescription.value = 'pleaseConnectPairedDevice'.tr;
        return;
      }

      // 判断设备名称是否符合要求
      if (!_isValidDeviceName(currentDevice!.name)) {
        statusDescription.value = 'pleaseConnectDeepSoundDevice'.tr;
        return;
      }

      // 设备匹配且合规，标记为已配对
      Logger.info('当前设备与已配对设备匹配');
      _companionAssociated.value = true;
      _userRejectedAssociation.value = false; // 重置拒绝状态
      await _bleService.registerBackgroundScan();
      _autoNavigateToHome();
    } catch (e) {
      Logger.error('检查设备配对状态失败: $e');
    }
  }

  /// 检查设备名称是否合规
  bool _isValidDeviceName(String deviceName) {
    return deviceName.contains("DeapSound");
  }

  /// 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) {
      permissionsToRequest.add(Permission.locationWhenInUse);
      // permissionsToRequest.add(Permission.microphone);
      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) {
      return 31; // 假设运行在需要新权限的设备上
    }
    return 0;
  }

  /// 设置服务状态监听
  void _setupServiceListeners() {
    // 监听蓝牙状态变化
    _bluetoothStateWorker =
        ever(_bluetoothService.bluetoothState.obs, (String state) {
      _bluetoothState.value = state;
      _updateStatusDescription();
    });

    // 监听设备连接状态变化
    _deviceWorker =
        ever(_bluetoothService.currentDeviceRx, (BluetoothDevice? device) {
      if (device != null && !_isNavigatingToHome) {
        Logger.info('配对页面发现设备已连接: ${device.name}');
        _handleDeviceConnected();
      }
      _updateStatusDescription();
    });
    if (needdeivice) {
      _handleDeviceConnected();
    }
  }

  /// 处理设备连接成功事件
  Future<void> _handleDeviceConnected() async {
    if (!isDeviceConnected || _isNavigatingToHome) return;

    // 检查配对状态，决定下一步操作
    await _checkDevicePairingStatus();

    // 如果还未配对且设备合规，启动配对流程
    if (!_companionAssociated.value &&
        _isValidDeviceName(currentDevice!.name)) {
      _startCompanionAssociation();
    }
  }

  /// 更新状态描述
  void _updateStatusDescription() {
    if (_userRejectedAssociation.value) {
      // 用户拒绝关联时的提示 - 这是最高优先级
      statusDescription.value = '关联后才能使用全部功能';
      actionButtonText.value = '关联DeapSound耳机';
      return;
    }

    if (!hasPermissions) {
      statusDescription.value = 'permissionDenied'.tr;
      actionButtonText.value = '去系统设置';
      return;
    }

    if (bluetoothState == 'off') {
      statusDescription.value = 'bluetoothTurnedOff'.tr;
      actionButtonText.value = '去系统设置';
      return;
    }

    if (isDeviceConnected) {
      if (Platform.isAndroid && !isCompanionAssociated && _isAssociating) {
        statusDescription.value =
            '${'associatingDevice'.tr} ${currentDevice!.name}';
      } else {
        statusDescription.value =
            '${'connectedDevice'.tr} ${currentDevice!.name}';
      }
      return;
    }

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

    statusDescription.value = 'notFound'.tr;
  }

  /// 启动Companion设备关联流程
  Future<void> _startCompanionAssociation() async {
    // 如果不是Android平台，已跳转，已完成关联或正在进行关联，直接返回
    if (!Platform.isAndroid ||
        _isNavigatingToHome ||
        _companionAssociated.value ||
        _isAssociating ||
        !isDeviceConnected) {
      return;
    }

    // 重置拒绝状态
    _userRejectedAssociation.value = false;

    // 设置关联状态标志
    _isAssociating = true;
    _updateStatusDescription();

    try {
      // 检查是否支持Companion功能
      final isSupported = await _bleService.isCompanionSupported();
      if (!isSupported) {
        Logger.info('设备不支持Companion功能，跳过关联');
        _companionAssociated.value = true;
        _autoNavigateToHome();
        return;
      }

      // 检查设备名称是否符合要求
      if (!_isValidDeviceName(currentDevice!.name)) {
        statusDescription.value = 'pleaseConnectDeepSoundDevice'.tr;
        _isAssociating = false;
        return;
      }

      Logger.info('开始Companion设备关联流程, 设备MAC: ${currentDevice!.address}');

      var success = await _bleService.startDeviceAssociation(
        deviceNamePattern: currentDevice!.name,
        macAddress: currentDevice!.address,
      );
      _isAssociating = false;

      if (success) {
        Logger.info('Companion设备关联成功');
        _companionAssociated.value = true;
        _userRejectedAssociation.value = false;

        // 注册后台扫描，确保应用被杀死后仍能被唤醒
        await _bleService.registerBackgroundScan(
            macAddress: currentDevice!.address);

        // 关联成功后跳转
        _autoNavigateToHome();
      } else {
        Logger.error('Companion设备关联失败或被用户拒绝');
        // 关联失败 - 用户拒绝关联
        _userRejectedAssociation.value = true;
        // 确保UI状态更新
        _updateStatusDescription();
      }
    } catch (e) {
      Logger.error('Companion设备关联过程发生错误: $e');
      _isAssociating = false;
      _userRejectedAssociation.value = true;
      _updateStatusDescription();
    }
  }

  /// 自动跳转到主页
  Future<void> _autoNavigateToHome() async {
    if (needdeivice && (_isNavigatingToHome || !isDeviceConnected)) return;

    // 启动BLE后台服务
    await _startAgentService();

    _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);
    });
  }

  /// 启动BLE后台服务
  Future<void> _startAgentService() async {
    try {
      if (needdeivice && !isDeviceConnected) return;

      final result = await BleManager.to.startAgentService();
      Logger.info(result ? 'BLE后台服务启动成功' : 'BLE后台服务启动失败');
    } catch (e) {
      Logger.error('启动BLE后台服务发生错误: $e');
    }
  }

  /// 停止BLE后台服务
  Future<void> _stopAgentService() async {
    try {
      final result = await BleManager.to.stopAgentService();
      Logger.info(result ? 'BLE后台服务停止成功' : 'BLE后台服务停止失败');
    } catch (e) {
      Logger.error('停止BLE后台服务发生错误: $e');
    }
  }

  /// 处理按钮点击
  void handleActionButtonTap() {
    if (userRejectedAssociation) {
      // 用户拒绝关联后，点击按钮重新开始关联
      restartAssociation();
    } else if (!hasPermissions || !isBluetoothOn) {
      // 权限未授予或蓝牙关闭时，打开系统设置
      openBluetoothSettings();
    }
  }

  /// 打开系统蓝牙设置
  void openBluetoothSettings() {
    try {
      if (!hasPermissions) {
        openAppSettings();
      } else if (Platform.isAndroid && !isBluetoothOn) {
        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();
  }

  /// 重新开始关联
  void restartAssociation() {
    if (isDeviceConnected && !isCompanionAssociated) {
      _startCompanionAssociation();
    }
  }

  /// 跳过连接
  void skipConnecting() async {
    // 启动BLE后台服务
    await _startAgentService();
    _isNavigatingToHome = true;
    Get.offAllNamed(Routes.home);
  }
}