import 'dart:convert';
import 'dart:typed_data';

import 'package:app_settings/app_settings.dart';
import 'package:deep_voice/data/models/appconfig.dart';
import 'package:deep_voice/data/models/user_Info.dart';
import 'package:deep_voice/data/services/network/api.dart';
import 'package:flutter/material.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 '../../../data/services/ble_manager.dart';
import '../../../core/utils/permission_util.dart';

/// 配对状态枚举 - 简化版本
enum PairingState {
  idle, // 空闲/初始状态
  checking, // 检查中（蓝牙、权限等）
  waitingClassic, // 等待经典蓝牙连接
  verifying, // 验证设备
  binding, //确认绑定设备
  manualbinding, //手动绑定设备
  associating, // 正在进行BLE设备关联
  waitingBle, //等待BLE连接
  completed, //配对完成
  error, // 错误状态
}

/// 错误类型枚举
enum ErrorType {
  none,
  bluetoothOff, // 蓝牙关闭
  noPermission, // 无权限
  noClassicDevice, // 无经典蓝牙设备
  deviceNotMatch, // 设备不匹配
  deviceBound, // 设备已被绑定
  associationFailed, // 关联失败
  bleTimeout, // BLE连接超时
  authnFailed, // 授权失败
  networkError, // 网络错误
}

/// 配对控制器 - 基于简化状态机的实现
class PairingController extends GetxController {
  static const String _tag = 'PairingCtrl';
  static PairingController get to => Get.find();

  // ========== 状态管理 ==========
  final _currentState = PairingState.idle.obs;
  final _errorType = ErrorType.none.obs;
  final _errorMessage = ''.obs;

  PairingState get currentState => _currentState.value;
  ErrorType get errorType => _errorType.value;
  String get errorMessage => _errorMessage.value;

  // ========== UI状态 ==========
  final statusText = ''.obs;
  final isLoading = false.obs;
  final showConnectButton = false.obs;
  final showRetryButton = false.obs;
  final showBindButton = false.obs;
  final showRetryChectButton = false.obs;
  final showAutoCodeInput = false.obs;
  final showSkipButton = false.obs;
  // 增加临时跳过绑定按钮状态
  final showSkipBindingButton = false.obs; // 新增临时跳过绑定按钮

  final connectButtonText = '连接设备'.obs;
  final retryButtonText = '重试'.obs;
  final deviceCode = ''.obs;

  // ========== 监听器管理 ==========
  final List<Worker> _workers = [];
  Timer? _bleTimeoutTimer;

  // ========== 依赖服务 ==========
  late final BluetoothManager _bluetoothManager;
  late final BleManager _bleManager;

  // ========== 当前设备信息 ==========
  BluetoothDevice? _currentClassicDevice;
  String? _verifiedDeviceAddress;
  TextEditingController codeInputController = TextEditingController();

  // Public getter for view access
  BluetoothDevice? get currentDevice => _currentClassicDevice;

  @override
  void onInit() {
    super.onInit();
    Logger.i(_tag, '配对控制器初始化');

    // 确保服务已初始化
    _bluetoothManager = Get.find<BluetoothManager>();
    _bleManager = Get.find<BleManager>();

    // 集中设置所有监听器
    _setupAllListeners();

    // 开始初始状态检查
    // 延迟稍长时间，确保BluetoothManager有足够时间获取已连接设备
    Future.delayed(const Duration(milliseconds: 300), () {
      _startInitialCheck();
    });
  }

  @override
  void onClose() {
    Logger.i(_tag, '配对控制器销毁');
    // 清理所有Worker
    for (var worker in _workers) {
      worker.dispose();
    }
    _workers.clear();

    // 清理定时器
    _bleTimeoutTimer?.cancel();

    super.onClose();
  }

  // ==================== 监听器设置 ====================

  /// 集中设置所有监听器
  void _setupAllListeners() {
    // 1. 监听蓝牙开关状态
    _setupBluetoothStateListener();

    // 2. 监听经典蓝牙连接状态
    _setupClassicConnectionListener();

    // 3. 监听BLE连接状态
    _setupBleConnectionListener();
  }

  /// 监听蓝牙开关状态
  void _setupBluetoothStateListener() {
    _workers.add(ever(_bluetoothManager.bluetoothStateRx, (String state) {
      Logger.d(_tag, '蓝牙状态变化: $state');
      _handleBluetoothStateChange(state);
    }));
  }

  /// 监听经典蓝牙连接状态
  void _setupClassicConnectionListener() {
    _workers
        .add(ever(_bluetoothManager.currentDeviceRx, (BluetoothDevice? device) {
      Logger.d(_tag, '经典蓝牙设备变化: ${device?.name}');
      _handleClassicDeviceChange(device);
    }));
  }

  /// 监听BLE连接状态
  void _setupBleConnectionListener() {
    _workers.add(ever(_bleManager.connectionStateRx, (int state) {
      Logger.d(_tag, 'BLE连接状态变化: $state');
      _handleBleStateChange(state);
    }));
  }

  // ==================== 状态处理 ====================

  /// 处理蓝牙开关状态变化
  void _handleBluetoothStateChange(String state) {
    if (state == 'off') {
      // 蓝牙关闭，进入错误状态
      _setError(ErrorType.bluetoothOff, '请开启蓝牙');
    } else if (state == 'on' && _errorType.value == ErrorType.bluetoothOff) {
      // 蓝牙重新开启，恢复流程
      Logger.i(_tag, '检测到蓝牙已开启，自动恢复配对流程');
      _clearError();
      // 延迟一下确保蓝牙服务完全就绪
      Future.delayed(const Duration(milliseconds: 500), () {
        _checkCurrentStatus();
      });
    }
  }

  /// 处理经典蓝牙设备变化
  void _handleClassicDeviceChange(BluetoothDevice? device) {
    _currentClassicDevice = device;

    switch (_currentState.value) {
      case PairingState.waitingClassic:
        if (device != null) {
          // 有设备连接，进入验证阶段
          Logger.i(_tag, '检测到经典蓝牙设备连接，开始验证');
          _transition(PairingState.verifying);
          _verifyDevice(device);
        }
        break;

      case PairingState.error:
        // 如果在错误状态下检测到设备连接，且错误是无设备连接，则自动恢复
        if (device != null && _errorType.value == ErrorType.noClassicDevice) {
          Logger.i(_tag, '检测到设备重新连接，自动恢复配对流程');
          _clearError();
          _transition(PairingState.verifying);
          _verifyDevice(device);
        }
        break;

      case PairingState.verifying:
      case PairingState.waitingBle:
      case PairingState.completed:
        if (device == null) {
          // 设备断开，返回等待连接状态
          _setError(ErrorType.noClassicDevice, '设备已断开');
        }
        break;

      default:
        break;
    }
  }

  /// 处理BLE状态变化
  void _handleBleStateChange(int state) {
    if (_currentState.value == PairingState.waitingBle) {
      if (state == 2) {
        // BLE已连接
        _bleTimeoutTimer?.cancel();
        _transition(PairingState.completed);
      }
    }

    // 如果在完成状态下BLE断开，显示警告但不改变状态
    if (_currentState.value == PairingState.completed && state != 2) {
      Logger.w(_tag, 'BLE连接已断开，但配对流程已完成');
    }
  }

  // ==================== 状态转换 ====================

  /// 状态转换
  void _transition(PairingState newState) {
    final oldState = _currentState.value;
    _currentState.value = newState;
    Logger.i(_tag, '状态转换: $oldState -> $newState');

    // 根据新状态执行相应操作
    _onStateChanged(newState);
  }

  /// 状态变化处理
  void _onStateChanged(PairingState state) {
    // 重置UI状态
    isLoading.value = false;
    showConnectButton.value = false;
    showRetryButton.value = false;
    showSkipBindingButton.value = false; // 重置临时跳过绑定按钮
    showSkipButton.value = false;
    showAutoCodeInput.value = false;
    showBindButton.value = false;
    showRetryChectButton.value = false;
    switch (state) {
      case PairingState.idle:
        statusText.value = '准备开始配对';
        break;

      case PairingState.checking:
        statusText.value = '正在检查环境...';
        isLoading.value = true;
        break;

      case PairingState.waitingClassic:
        statusText.value = '请确保耳机已开启并进入配对模式';
        showConnectButton.value = true;
        showSkipButton.value = true;

        connectButtonText.value = '前往蓝牙设置';
        break;

      case PairingState.verifying:
        statusText.value = '正在验证设备...';
        isLoading.value = true;
        break;
      case PairingState.binding:
        statusText.value = '确认绑定';
        isLoading.value = true;
        showBindButton.value = true;
        showRetryChectButton.value = true;
        break;
      case PairingState.associating:
        statusText.value = '正在关联设备...';
        isLoading.value = true;
        // 延迟执行关联，确保状态已更新
        Future.delayed(const Duration(milliseconds: 200), () {
          _startDeviceAssociation();
        });
        break;

      case PairingState.waitingBle:
        statusText.value = '正在建立安全连接...';
        isLoading.value = true;
        // 延迟一下再调用，给BLE管理器时间更新状态
        Future.delayed(const Duration(milliseconds: 200), () {
          _startBleConnection();
        });
        break;
      case PairingState.manualbinding:
        statusText.value = '需要手动绑定授权码...';
        isLoading.value = false;
        showAutoCodeInput.value = true;
        // showSkipButton.value = true;
        showSkipBindingButton.value = true; // 显示临时跳过绑定按钮
        break;
      case PairingState.completed:
        statusText.value = '配对成功！';
        isLoading.value = false;
        _navigateToHome();
        break;

      case PairingState.error:
        statusText.value = _errorMessage.value;
        isLoading.value = false;
        showSkipButton.value = true;

        // 根据错误类型决定显示哪个按钮和按钮文本
        switch (_errorType.value) {
          case ErrorType.bluetoothOff:
            showConnectButton.value = true;
            connectButtonText.value = '开启蓝牙';
            break;
          case ErrorType.noClassicDevice:
            showConnectButton.value = true;
            connectButtonText.value = '前往蓝牙设置';
            break;
          case ErrorType.noPermission:
            showRetryButton.value = true;
            retryButtonText.value = '授予权限';
            break;
          case ErrorType.associationFailed:
            showRetryButton.value = true;
            retryButtonText.value = '重新关联';
            break;
          case ErrorType.authnFailed:
            showRetryButton.value = true;
            retryButtonText.value = '重新授权';
            break;
          default:
            showRetryButton.value = true;
            retryButtonText.value = '重试';
            break;
        }
        break;
    }
  }

  // ==================== 错误处理 ====================

  /// 设置错误状态
  void _setError(ErrorType type, String message) {
    _errorType.value = type;
    _errorMessage.value = message;
    _transition(PairingState.error);
  }

  /// 清除错误状态
  void _clearError() {
    _errorType.value = ErrorType.none;
    _errorMessage.value = '';
  }

  // ==================== 核心流程 ====================

  /// 开始初始检查
  void _startInitialCheck() {
    _transition(PairingState.checking);
    _checkCurrentStatus();
  }

  /// 检查当前状态并决定下一步
  void _checkCurrentStatus() async {
    try {
      // 1. 检查蓝牙状态
      if (_bluetoothManager.bluetoothState == 'off') {
        _setError(ErrorType.bluetoothOff, '请开启蓝牙');
        return;
      }

      // 2. 检查权限
      if (!await _checkPermissions()) {
        _setError(ErrorType.noPermission, '请授予必要权限');
        return;
      }

      // 3. 先刷新设备连接状态，确保获取最新的连接信息
      await _bluetoothManager.refreshDeviceConnection();

      // 4. 检查经典蓝牙连接
      final classicDevice = _bluetoothManager.currentDevice;
      if (classicDevice == null) {
        _transition(PairingState.waitingClassic);
        return;
      }

      // 5. 如果有设备，进行验证
      _currentClassicDevice = classicDevice;
      _transition(PairingState.verifying);
      await _verifyDevice(classicDevice);
    } catch (e) {
      Logger.e(_tag, '状态检查失败: $e');
      _setError(ErrorType.networkError, '检查失败，请重试');
    }
  }

  /// 检查权限
  Future<bool> _checkPermissions() async {
    // Android权限检查
    if (Platform.isAndroid) {
      // 检查蓝牙相关权限
      final bluetoothScan = await Permission.bluetoothScan.request();
      final bluetoothConnect = await Permission.bluetoothConnect.request();
      final location = await Permission.locationWhenInUse.request();

      return bluetoothScan.isGranted &&
          bluetoothConnect.isGranted &&
          location.isGranted;
    }
    return true;
  }

  /// 验证设备
  Future<void> _verifyDevice(BluetoothDevice device) async {
    try {
      Logger.i(_tag, '开始验证设备: ${device.name} (${device.address})');
      final result = await authbindingDevice(device);
      if (result == 10) {
        //验证失败 进入手动授权
        await connectble(device);
      } else if (result == 9) {
        Logger.i(_tag, 'BLE已连接，直接完成配对');
        _transition(PairingState.completed);
      } else if (result == 1) {
        //跳转绑定界面
        //验证失败 进入手动授权
        if (currentDevice != null) {
          _transition(PairingState.binding);
        } else {
          _transition(PairingState.checking);
          _checkCurrentStatus();
        }
      } else {
        final authcode_open = AppConfig.env("APP_AUTHCODE_OPEN") ?? "";
        if (authcode_open == "true") {
          //验证失败 进入手动授权
          _transition(PairingState.manualbinding);
        } else {
          _setError(ErrorType.deviceNotMatch, '请连接 DeepSound 设备');
        }
      }
    } catch (e) {
      Logger.e(_tag, '设备验证异常: $e');
      _setError(ErrorType.networkError, '验证失败，请重试');
    }
  }

  //连接ble
  Future<void> connectble(BluetoothDevice device) async {
    Logger.i(_tag, '设备验证通过');
    _verifiedDeviceAddress = device.address;
    // 检查是否已有BLE关联
    final pairedMacAddress = await _bleManager.getPairedMacAddress();
    Logger.i(_tag, '已关联的MAC地址: $pairedMacAddress');

    if (pairedMacAddress != null &&
        pairedMacAddress.toUpperCase() == device.address.toUpperCase()) {
      // 已有关联，检查BLE连接状态
      Logger.i(_tag, '设备已关联，检查BLE连接状态');
      final currentBleState = await _bleManager.getConnectionState();
      Logger.i(_tag, '验证时BLE状态: $currentBleState');

      if (currentBleState == 2) {
        // BleConnectionState.connected
        Logger.i(_tag, 'BLE已连接，直接完成配对');
        _transition(PairingState.completed);
      } else {
        Logger.i(_tag, 'BLE未连接，等待BLE连接');
        _transition(PairingState.waitingBle);
      }
    } else {
      // 没有关联或关联的是其他设备，需要进行关联
      Logger.i(_tag, '需要进行BLE设备关联');
      _transition(PairingState.associating);
    }
    return;
  }

  /// 开始设备关联
  void _startDeviceAssociation() async {
    try {
      if (_verifiedDeviceAddress == null) {
        _setError(ErrorType.associationFailed, '设备地址无效');
        return;
      }

      Logger.i(_tag, '开始BLE设备关联: $_verifiedDeviceAddress');

      // 调用BLE管理器的关联方法
      final success = await _bleManager.startDeviceAssociation(
        deviceNamePattern: 'DeapSound', // 或者使用 _currentClassicDevice?.name
        macAddress: _verifiedDeviceAddress!,
      );

      if (success) {
        Logger.i(_tag, 'BLE设备关联成功');
        // 关联成功后，转到等待BLE连接状态
        _transition(PairingState.waitingBle);
      } else {
        _setError(ErrorType.associationFailed, 'BLE设备关联失败');
      }
    } catch (e) {
      Logger.e(_tag, 'BLE设备关联异常: $e');
      _setError(ErrorType.associationFailed, '设备关联失败，请重试');
    }
  }

  /// 开始BLE连接
  void _startBleConnection() async {
    try {
      // 设置超时定时器
      _bleTimeoutTimer?.cancel();
      _bleTimeoutTimer = Timer(const Duration(seconds: 30), () {
        if (_currentState.value == PairingState.waitingBle) {
          _setError(ErrorType.bleTimeout, 'BLE连接超时，请重试');
        }
      });

      // 检查是否已连接 - 直接从原生层获取最新状态
      final currentBleState = await _bleManager.getConnectionState();
      Logger.i(_tag, 'BLE当前连接状态: $currentBleState');

      if (currentBleState == 2) {
        // BleConnectionState.connected
        Logger.i(_tag, 'BLE已经连接，直接完成配对');
        _bleTimeoutTimer?.cancel();
        _transition(PairingState.completed);
        return;
      }

      // 注册后台扫描以开始BLE配对
      if (_verifiedDeviceAddress != null) {
        final success = await _bleManager.registerBackgroundScan(
            macAddress: _verifiedDeviceAddress);
        if (!success && _currentState.value == PairingState.waitingBle) {
          _setError(ErrorType.bleTimeout, 'BLE配对启动失败');
        }
      }
    } catch (e) {
      Logger.e(_tag, 'BLE连接失败: $e');
      _setError(ErrorType.bleTimeout, 'BLE连接失败');
    }
  }

  //自动绑定设备 0 未合作商 1 合作商 2，已绑定
  Future<int> authbindingDevice(BluetoothDevice device) async {
    if (User.instance.earphonelicense != "" &&
        User.instance.earphonemac == device.address) {
      // 已经绑定
      return 10;
    }
    if (User.instance.earphoneauthcode != "" &&
        User.instance.earphonemac == device.address) {
      // 已经绑定
      return 9;
    }
    // 检查设备名称是否包含 DeepSound 或 DeapSound
    final deviceName = device.name;

    final names = AppConfig.allproductNames();
    print('获取到 deviceName: $deviceName names:$names');
    if (names.contains(deviceName)) {
      await _bleManager.startScan(deviceName);
      await Future.delayed(const Duration(seconds: 1));
      // 尝试最多读取 3 次设备信息，每次间隔 1 秒
      Map<String, String>? deviceinfo;
      for (int i = 0; i < 3; i++) {
        deviceinfo = await _bleManager.getDeviceInfo(device.address);
        print('获取到 deviceinfo: $deviceinfo');
        if (deviceinfo != null) {
          break;
        }
        await Future.delayed(Duration(seconds: 1));
      }
      print('获取到 deviceinfo: $deviceinfo');
      if (deviceinfo != null) {
        // final code = processHex(deviceinfo["hex"]!, 15, 25);
        String code = extractAndReverseBytes(deviceinfo["hex"]!, 15, 24);
        print('获取到 code: $code');
        // 安全检查长度
        if (code != "") {
          deviceCode.value = code;
          return 1;
        } else {
          return 0;
        }
      }
      return 0;
      // 调用BLE管理器的自动绑定方法
    } else {
      return 0;
    }
  }

  //确认绑定设备
  void confirmBindDevice() async {
    final response = await Api.bindearphone({
      "code": deviceCode.value,
      "earphonname": currentDevice?.name,
      "earphonemac": currentDevice?.address,
    });
    Logger.i(_tag, '手动授权结果 ${response}');
    if (response != null) {
      Logger.i(_tag, '绑定设备成功');
      User.instance.earphonemac = currentDevice?.address ?? '';
      User.instance.earphonename = currentDevice?.name ?? '';
      User.instance.earphonelicense = deviceCode.value;
      _transition(PairingState.verifying);
      _verifyDevice(_currentClassicDevice!);
      return;
    } else {
      Logger.e(_tag, '绑定设备失败!');
      return;
    }
  }

  int reverseBits(int byte) {
    // 这里是 nibble swap 还是 bit 反转？看你需求，先保持 nibble swap
    return ((byte & 0x0F) << 4) | ((byte & 0xF0) >> 4);
  }

  String extractAndReverseBytes(String hex, int start, int end) {
    List<int> bytes = [];
    for (int i = 0; i < hex.length; i += 2) {
      bytes.add(int.parse(hex.substring(i, i + 2), radix: 16));
    }
    List<int> slice = bytes.sublist(start, end + 1);
    List<int> reversed = slice.reversed.toList();
    return reversed
        .map((b) => b.toRadixString(16).padLeft(2, '0'))
        .join()
        .toUpperCase();
  }

  /// 用户点击授权码输入框
  void onAutoCodeInputTap() async {
    // 调用BLE管理器的自动绑定方法
    final response = await Api.bindauthcode({
      "code": codeInputController.text.trim(),
      "earphonname": currentDevice?.name,
      "earphonemac": currentDevice?.address,
    });
    Logger.i(_tag, '手动授权结果 ${response}');
    if (response != null) {
      User.instance.earphonemac = currentDevice?.address ?? '';
      User.instance.earphonename = currentDevice?.name ?? '';
      User.instance.earphoneauthcode = codeInputController.text.trim();
      _transition(PairingState.verifying);
      _verifyDevice(_currentClassicDevice!);
    } else {
      Logger.e(_tag, '手动绑定失败!');
      _setError(ErrorType.authnFailed, '设备授权失败,请检查授权码');
    }
  }

  /// 导航到主页
  void _navigateToHome() {
    Future.delayed(const Duration(seconds: 1), () async {
      // 启动AgentService服务
      try {
        Logger.i(_tag, '启动AgentService服务');
        await _bleManager.startAgentService();
      } catch (e) {
        Logger.e(_tag, '启动AgentService失败: $e');
      }

      Get.offAllNamed(Routes.home);
    });
  }

  // ==================== 用户操作 ====================

  /// 用户点击连接按钮
  void onConnectTap() {
    Logger.i(_tag, '用户点击连接按钮');

    // 根据当前状态或错误类型决定行为
    if (_currentState.value == PairingState.error) {
      switch (_errorType.value) {
        case ErrorType.bluetoothOff:
          // 引导用户去开启蓝牙
          Logger.i(_tag, '引导用户开启蓝牙');
          AppSettings.openAppSettings(type: AppSettingsType.bluetooth);
          break;
        case ErrorType.noClassicDevice:
          // 引导用户去蓝牙设置连接设备
          Logger.i(_tag, '引导用户去蓝牙设置');
          AppSettings.openAppSettings(type: AppSettingsType.bluetooth);
          break;
        default:
          // 其他错误情况，刷新并重试
          _bluetoothManager.refreshDeviceConnection();
          _checkCurrentStatus();
          break;
      }
    } else if (_currentState.value == PairingState.waitingClassic) {
      // 等待经典蓝牙连接状态，引导去设置
      Logger.i(_tag, '等待经典蓝牙连接，引导用户去蓝牙设置');
      AppSettings.openAppSettings(type: AppSettingsType.bluetooth);
    } else {
      // 其他情况，刷新设备连接
      _bluetoothManager.refreshDeviceConnection();
      _checkCurrentStatus();
    }
  }

  /// 用户点击重试按钮
  void onRetryTap() {
    Logger.i(_tag, '用户点击重试按钮');

    // 如果是权限问题，引导去设置
    if (_errorType.value == ErrorType.noPermission) {
      Logger.i(_tag, '引导用户去应用设置授予权限');
      AppSettings.openAppSettings();
    } else {
      // 其他情况，清除错误并重试
      _clearError();
      _startInitialCheck();
    }
  }

  /// 用户点击跳过绑定按钮
  void onSkipBindingTap() {
    Logger.i(_tag, '用户选择临时跳过手动绑定');

    User.instance.earphonemac = currentDevice?.address ?? '';
    _transition(PairingState.verifying);
    _verifyDevice(_currentClassicDevice!);
  }

  /// 用户点击跳过按钮
  void onSkipTap() async {
    Logger.i(_tag, '用户选择跳过配对');

    // 启动AgentService服务
    try {
      Logger.i(_tag, '启动AgentService服务');
      await _bleManager.startAgentService();
    } catch (e) {
      Logger.e(_tag, '启动AgentService失败: $e');
    }

    Get.offAllNamed(Routes.home);
  }

  /// 打开蓝牙设置
  void openBluetoothSettings() {
    AppSettings.openAppSettings(type: AppSettingsType.bluetooth);
  }

  /// 清除设备关联（在需要重新配对时调用）
  Future<void> clearDeviceAssociation() async {
    try {
      Logger.i(_tag, '清除设备关联');
      await _bleManager.clearPairedDevices();
    } catch (e) {
      Logger.e(_tag, '清除设备关联失败: $e');
    }
  }
}