import 'package:get/get.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:flutter/material.dart';
import 'dart:io' show Platform;
import 'package:device_info_plus/device_info_plus.dart';
import '../../../core/utils/permission_util.dart';

class PermissionsController extends GetxController {
  // 权限状态映射
  final RxMap<Permission, PermissionStatus> permissionStatuses =
      <Permission, PermissionStatus>{}.obs;

  // 是否正在请求权限
  final RxBool isRequestingPermission = false.obs;
  
  // Android版本信息（用于权限组显示判断）
  final RxInt androidSdkVersion = 0.obs;

  @override
  void onInit() {
    super.onInit();
    _initAndroidVersion();
    checkAllPermissions();
  }
  
  /// 初始化Android版本信息
  Future<void> _initAndroidVersion() async {
    if (Platform.isAndroid) {
      try {
        final deviceInfo = DeviceInfoPlugin();
        final androidInfo = await deviceInfo.androidInfo;
        androidSdkVersion.value = androidInfo.version.sdkInt;
      } catch (e) {
        print('获取Android版本信息失败: $e');
        androidSdkVersion.value = 0;
      }
    }
  }
  
  /// 检查是否应该显示蓝牙权限组
  bool shouldShowBluetoothPermissions() {
    if (Platform.isAndroid) {
      // Android 12+ (API 31+) 才显示蓝牙权限组
      return androidSdkVersion.value >= 31;
    } else if (Platform.isIOS) {
      // iOS显示蓝牙权限组
      return true;
    }
    return false;
  }
  
  /// 检查是否应该显示存储权限组
  bool shouldShowStoragePermissions() {
    if (Platform.isAndroid) {
      // Android 10及以下版本 (API 29及以下) 才显示存储权限组
      return androidSdkVersion.value <= 29 && androidSdkVersion.value > 0;
    }
    // iOS系统不显示存储权限组
    return false;
  }

  /// 检查所有权限状态
  Future<Map<Permission, PermissionStatus>> checkAllPermissions() async {
    final Map<Permission, PermissionStatus> statuses = {};

    // 根据平台获取需要检查的权限列表
    final permissions = await _getPlatformPermissions();

    for (final permission in permissions) {
      try {
        statuses[permission] = await permission.status;
        print('Permission: $permission, Status: ${statuses[permission]}');
      } catch (e) {
        // 某些权限在特定平台可能不支持，设置为拒绝状态
        statuses[permission] = PermissionStatus.denied;
      }
    }

    permissionStatuses.value = statuses;
    return statuses;
  }

  /// 获取蓝牙权限列表（根据Android版本）
  Future<List<Permission>> _getBluetoothPermissions() async {
    if (Platform.isAndroid) {
      try {
        final deviceInfo = DeviceInfoPlugin();
        final androidInfo = await deviceInfo.androidInfo;
        // Android 12+ (API 31+) 使用新的蓝牙权限
        if (androidInfo.version.sdkInt >= 31) {
          return [
            Permission.bluetoothScan,
            Permission.bluetoothConnect,
          ];
        }
        // Android 12以下不显示蓝牙权限（因为会自动授予）
        return [];
      } catch (e) {
        print('获取Android版本信息失败: $e');
        return [];
      }
    } else if (Platform.isIOS) {
      // iOS使用基本蓝牙权限
      return [Permission.bluetooth];
    }
    return [];
  }

  /// 获取平台特定的权限列表
  Future<List<Permission>> _getPlatformPermissions() async {
    final bluetoothPermissions = await _getBluetoothPermissions();
    
    if (Platform.isIOS) {
      final List<Permission> permissions = [
        Permission.calendarFullAccess,
        Permission.location,
        Permission.contacts,
        ...bluetoothPermissions,
        Permission.notification,
        Permission.microphone,
      ];
      
      // iOS系统不添加存储权限（根据shouldShowStoragePermissions方法）
      if (shouldShowStoragePermissions()) {
        permissions.add(Permission.storage);
      }
      
      return permissions;
    } else if (Platform.isAndroid) {
      final List<Permission> permissions = [
        Permission.calendarFullAccess,
        Permission.location,
        Permission.phone,
        Permission.sms,
        Permission.contacts,
        ...bluetoothPermissions,
        Permission.notification,
        Permission.scheduleExactAlarm,
        Permission.microphone,
      ];
      
      // 只在Android 10及以下版本添加存储权限
      if (shouldShowStoragePermissions()) {
        permissions.add(Permission.storage);
      }
      
      return permissions;
    }
    return [];
  }

  /// 请求单个权限
  Future<bool> requestPermission(Permission permission) async {
    if (isRequestingPermission.value) return false;

    isRequestingPermission.value = true;

    try {
      final permissionName = getPermissionName(permission);
      final explanationText = _getDetailedDescription(permission);

      final hasPermission = await PermissionUtil.instance.requestPermission(
        permissionType: permission,
        permissionName: permissionName,
        explanationText: explanationText,
        permanentDenialText:
            'permanentDenialText'.tr.replaceAll('{permission}', permissionName),
        settingsButtonText: 'goToSettings'.tr,
        cancelButtonText: 'cancel'.tr,
      );

      if (hasPermission) {
        _showSuccessMessage();
      }

      // 刷新权限状态
      await checkAllPermissions();

      return hasPermission;
    } catch (e) {
      _showErrorMessage();
      return false;
    } finally {
      isRequestingPermission.value = false;
    }
  }

  /// 打开系统设置
  void openSettings() {
    openAppSettings();
  }

  /// 获取权限的用户友好名称
  String getPermissionName(Permission permission) {
    switch (permission) {
      case Permission.phone:
        return 'phone'.tr;
      case Permission.sms:
        return 'sms'.tr;
      case Permission.contacts:
        return 'contacts'.tr;
      case Permission.bluetooth:
        return 'bluetooth'.tr;
      case Permission.bluetoothScan:
        return 'bluetoothScan'.tr;
      case Permission.bluetoothConnect:
        return 'bluetoothConnect'.tr;
      case Permission.notification:
        return 'notification'.tr;
      case Permission.calendarWriteOnly:
        return 'calendarWrite'.tr;
      case Permission.calendarFullAccess:
        return 'calendarFullAccess'.tr;
      case Permission.location:
        return 'locationInfo'.tr;
      case Permission.scheduleExactAlarm:
        return 'alarm'.tr;
      case Permission.storage:
        return 'storagePermission'.tr;
      case Permission.microphone:
        return 'microphonePermission'.tr;
      default:
        return permission.toString();
    }
  }

  /// 获取权限说明文本
  String _getDetailedDescription(Permission permission) {
    switch (permission) {
      case Permission.phone:
        return 'phonePermissionDetailDesc'.tr;
      case Permission.sms:
        return 'smsPermissionDetailDesc'.tr;
      case Permission.contacts:
        return 'contactsPermissionDetailDesc'.tr;
      case Permission.bluetooth:
        return 'bluetoothPermissionDetailDesc'.tr;
      case Permission.bluetoothScan:
        return 'bluetoothScanPermissionDetailDesc'.tr;
      case Permission.bluetoothConnect:
        return 'bluetoothConnectPermissionDetailDesc'.tr;
      case Permission.notification:
        return 'notificationPermissionDetailDesc'.tr;
      case Permission.calendarWriteOnly:
        return 'calendarWritePermissionDetailDesc'.tr;
      case Permission.calendarFullAccess:
        return 'calendarFullAccessPermissionDetailDesc'.tr;
      case Permission.location:
        return 'locationPermissionDetailDesc'.tr;
      case Permission.scheduleExactAlarm:
        return 'alarmPermissionDetailDesc'.tr;
      case Permission.storage:
        return 'storagePermissionExplanation'.tr;
      case Permission.microphone:
        return 'microphonePermissionExplanation'.tr;
      default:
        return 'appNeedsPermissionForFullFunction'.tr;
    }
  }

  /// 获取权限描述
  String getPermissionDescription(Permission permission) {
    switch (permission) {
      case Permission.phone:
        return 'phonePermissionDesc'.tr;
      case Permission.sms:
        return 'smsPermissionDesc'.tr;
      case Permission.contacts:
        return 'contactsPermissionDesc'.tr;
      case Permission.bluetooth:
        return 'bluetoothPermissionDesc'.tr;
      case Permission.bluetoothScan:
        return 'bluetoothScanPermissionDesc'.tr;
      case Permission.bluetoothConnect:
        return 'bluetoothConnectPermissionDesc'.tr;
      case Permission.notification:
        return 'notificationPermissionDesc'.tr;
      case Permission.calendarWriteOnly:
        return 'calendarWritePermissionDesc'.tr;
      case Permission.calendarFullAccess:
        return 'calendarFullAccessPermissionDesc'.tr;
      case Permission.location:
        return 'locationPermissionDesc'.tr;
      case Permission.scheduleExactAlarm:
        return 'alarmPermissionDesc'.tr;
      case Permission.storage:
        return 'storagePermissionExplanation'.tr;
      case Permission.microphone:
        return 'microphonePermissionExplanation'.tr;
      default:
        return 'appFunctionNeeds'.tr;
    }
  }

  /// 显示成功消息
  void _showSuccessMessage() {
    Get.snackbar(
      'success'.tr,
      'permissionGranted'.tr,
      snackPosition: SnackPosition.BOTTOM,
      backgroundColor: Colors.green,
      colorText: Colors.white,
    );
  }

  /// 显示错误消息
  void _showErrorMessage() {
    Get.snackbar(
      'error'.tr,
      'permissionRequestError'.tr,
      snackPosition: SnackPosition.BOTTOM,
      backgroundColor: Colors.red,
      colorText: Colors.white,
    );
  }
}