import 'dart:async';
import 'dart:developer';
import 'dart:io';
import 'package:eatvio_app/core/app_config.dart';
import 'package:eatvio_app/core/app_initializer.dart';
import 'package:eatvio_app/core/notifications/notification_permission_requester.dart';
import 'package:eatvio_app/core/push/hms_client_error.dart';
import 'package:device_info_plus/device_info_plus.dart';
import 'package:dio/dio.dart';
import 'package:eatvio_app/core/locator_service.dart';
import 'package:eatvio_app/core/token_storage.dart';
import 'package:firebase_messaging/firebase_messaging.dart';
import 'package:flutter/services.dart';
import 'package:eatvio_app/core/error_reporting/error_reporter.dart';
import 'package:flutter_callkit_incoming/flutter_callkit_incoming.dart';

class FirebaseApi {
  final ErrorReporter _errorReporter;
  final NotificationPermissionRequester _notificationPermissionRequester;
  final _firebaseMessaging = FirebaseMessaging.instance;

  FirebaseApi({
    required ErrorReporter errorReporter,
    NotificationPermissionRequester? notificationPermissionRequester,
  }) : _errorReporter = errorReporter,
       _notificationPermissionRequester = notificationPermissionRequester ?? NotificationPermissionRequester();

  Future<String?> getToken() async {
    final credentials = await _resolvePushCredentials();
    return credentials.token;
  }

  Future<void> _requestNotificationPermission() async {
    if (sl<AppConfig>().buildType != AppBuildType.prod) return;
    try {
      await _notificationPermissionRequester.requestOnce(
        () => _firebaseMessaging.requestPermission(),
      );
    } catch (e) {
      log('Failed to request Firebase messaging permission: $e');
    }
  }

  Future<void> registerAnonymousPushToken() async {
    try {
      await _requestNotificationPermission();
      final deviceInfo = DeviceInfoPlugin();
      final credentials = await _resolvePushCredentials();
      final token = credentials.token;
      if (token == null || token.isEmpty) return;
      await sl<Dio>().post(
        '/api/anonymous_token',
        data: {
          'platform': credentials.platform,
          'hw_id': Platform.isIOS ? (await deviceInfo.iosInfo).identifierForVendor : (await deviceInfo.androidInfo).id,
          'token': token,
        },
      ).timeout(
        const Duration(seconds: 10),
        onTimeout: () {
          throw TimeoutException('registerAnonymousPushToken timeout');
        },
      );
    } catch (e, st) {
      log(e.toString(), stackTrace: st);
      await _errorReporter.report(e, st, origin: 'FirebaseApi');
      // Не пробрасываем ошибку дальше, так как это не критичная операция
    }
  }

  Future<void> registerPushToken() async {
    if (await TokenStorage.haveTokenInStorage()) {
      try {
        await _requestNotificationPermission();
        final deviceInfo = DeviceInfoPlugin();
        final credentials = await _resolvePushCredentials();
        final token = credentials.token;
        if (token == null || token.isEmpty) return;
        await sl<Dio>().post(
          '/api/profile/notification/token/register',
          data: {
            'platform': credentials.platform,
            'hw_id': Platform.isIOS ? (await deviceInfo.iosInfo).identifierForVendor : (await deviceInfo.androidInfo).id,
            'token': token,
          },
        ).timeout(
          const Duration(seconds: 10),
          onTimeout: () {
            throw TimeoutException('registerPushToken timeout');
          },
        );
        if (Platform.isIOS) {
          await _registerIosVoipPushToken();
        }
      } catch (e, st) {
        log(e.toString(), stackTrace: st);
        await _errorReporter.report(e, st, origin: 'FirebaseApi');
        // Не пробрасываем ошибку дальше, так как это не критичная операция
      }
    }
  }


  Future<void> unregisterPushTokens() async {
    if (!await TokenStorage.haveTokenInStorage()) return;
    try {
      await unregisterPushToken();
    } catch (_) {}
    if (Platform.isIOS) {
      try {
        await _unregisterIosVoipPushToken();
      } catch (_) {}
    }
  }

  Future<void> unregisterPushToken() async {
    if (!await TokenStorage.haveTokenInStorage()) return;
    try {
      final credentials = await _resolvePushCredentials();
      final token = credentials.token ?? '';
      if (token.isEmpty) return;
      await sl<Dio>().post(
        '/api/profile/notification/token/unregister',
        data: {
          'platform': credentials.platform,
          'token': token,
        },
      ).timeout(
        const Duration(seconds: 10),
        onTimeout: () {
          throw TimeoutException('unregisterPushToken timeout');
        },
      );
    } catch (e, st) {
      log(e.toString(), stackTrace: st);
      await _errorReporter.report(e, st, origin: 'FirebaseApi');
    }
  }

  Future<void> _registerIosVoipPushToken() async {
    try {
      final token = (await FlutterCallkitIncoming.getDevicePushTokenVoIP())?.trim();
      if (token == null || token.isEmpty) return;

      final deviceInfo = DeviceInfoPlugin();
      await sl<Dio>().post(
        '/api/profile/notification/token/voip/register',
        data: {
          'platform': 'ios',
          'hw_id': (await deviceInfo.iosInfo).identifierForVendor,
          'token': token,
        },
      ).timeout(
        const Duration(seconds: 10),
        onTimeout: () {
          throw TimeoutException('registerPushToken voip timeout');
        },
      );
    } catch (e, st) {
      log(e.toString(), stackTrace: st);
      await _errorReporter.report(e, st, origin: 'FirebaseApi');
    }
  }

  Future<void> _unregisterIosVoipPushToken() async {
    try {
      final token = (await FlutterCallkitIncoming.getDevicePushTokenVoIP())?.trim() ?? '';
      await sl<Dio>().post(
        '/api/profile/notification/token/voip/unregister',
        data: {
          'token': token,
        },
      ).timeout(
        const Duration(seconds: 10),
        onTimeout: () {
          throw TimeoutException('unregisterPushToken voip timeout');
        },
      );
    } catch (e, st) {
      log(e.toString(), stackTrace: st);
      await _errorReporter.report(e, st, origin: 'FirebaseApi');
    }
  }

  Future<({String? token, String platform})> _resolvePushCredentials() async {
    if (Platform.isIOS) {
      return (
        token: await _getFcmToken(),
        platform: pushPlatform(isIos: true, huaweiFamily: false, hmsAvailable: false, hasHmsToken: false),
      );
    }

    final huaweiFamily = await _isHuaweiDevice();
    if (huaweiFamily && await _isHmsAvailable()) {
      final token = await _getHuaweiPushTokenNative().timeout(
        const Duration(seconds: 5),
        onTimeout: () => null,
      );
      if (token != null && token.isNotEmpty) {
        return (
          token: token,
          platform: pushPlatform(isIos: false, huaweiFamily: true, hmsAvailable: true, hasHmsToken: true),
        );
      }
    }

    return (
      token: await _getFcmToken(),
      platform: pushPlatform(isIos: false, huaweiFamily: huaweiFamily, hmsAvailable: false, hasHmsToken: false),
    );
  }

  Future<String?> _getFcmToken() {
    return _firebaseMessaging.getToken().timeout(
      const Duration(seconds: 5),
      onTimeout: () => null,
    );
  }

  Future<bool> _isHuaweiDevice() async {
    if (!Platform.isAndroid) return false;
    try {
      final info = await DeviceInfoPlugin().androidInfo;
      return isHuaweiFamilyBrand(brand: info.brand, manufacturer: info.manufacturer);
    } catch (_) {
      return false;
    }
  }

  Future<bool> _isHmsAvailable() async {
    try {
      const channel = MethodChannel('com.eatvioapp/hms_push');
      final available = await channel.invokeMethod<bool>('isHmsAvailable').timeout(const Duration(seconds: 5));
      return available ?? false;
    } catch (e, st) {
      log('HMS availability check failed: $e', stackTrace: st);
      return false;
    }
  }

  Future<String?> _getHuaweiPushTokenNative() async {
    try {
      const channel = MethodChannel('com.eatvioapp/hms_push');
      final String? token = await channel.invokeMethod<String>('getHuaweiToken');
      return token;
    } on PlatformException catch (e, st) {
      log(e.toString(), stackTrace: st);
      if (!isHmsClientUnavailable(e)) {
        await _errorReporter.report(e, st, origin: 'FirebaseApi');
      }
      return null;
    } catch (e, st) {
      log(e.toString(), stackTrace: st);
      await _errorReporter.report(e, st, origin: 'FirebaseApi');
      return null;
    }
  }
}