import 'package:firebase_auth/firebase_auth.dart';
import 'package:dio/dio.dart';
import 'package:flutter/cupertino.dart';
import 'package:flutter/foundation.dart';
import 'package:sign_in_with_apple/sign_in_with_apple.dart';
import 'package:yumi/app/routes/sc_routes.dart';
import 'package:yumi/app/routes/sc_fluro_navigator.dart';
import 'package:yumi/shared/tools/sc_google_auth_utils.dart';
import 'package:yumi/shared/tools/sc_loading_manager.dart';
import 'package:yumi/shared/tools/sc_version_utils.dart';
import 'package:yumi/shared/data_sources/sources/local/data_persistence.dart';
import 'package:yumi/shared/data_sources/sources/local/user_manager.dart';
import 'package:yumi/shared/data_sources/sources/repositories/sc_user_repository_impl.dart';
import 'package:yumi/ui_kit/components/sc_tts.dart';
import 'package:provider/provider.dart';
import 'package:yumi/services/audio/rtc_manager.dart';
import 'package:yumi/services/audio/rtm_manager.dart';

import '../../shared/data_sources/models/enum/sc_auth_type.dart';

class SocialChatAuthenticationManager extends ChangeNotifier {
  String authType = "";
  String uid = "";
  User? _user;

  User? get user => _user;

  bool get isSignedIn => _user != null;

  SocialChatAuthenticationManager() {
    _initializeAuthentication();
  }

  Future<void> _initializeAuthentication() async {
    try {
      await SCGoogleAuthService.initialize();
      await _verifyExistingSession();
    } catch (_) {
      // Login buttons should remain usable even if silent Google restore fails.
    }
  }

  Future<void> _verifyExistingSession() async {
    final user = await SCGoogleAuthService.signInSilently();
    _user = user;
    if (user != null) {
      authType = SCAuthType.GOOGLE.name;
      uid = user.uid;
      await DataPersistence.setPendingChannelAuth(authType, uid);
    }
    notifyListeners();
  }

  Future<void> authenticateUser(BuildContext context, String authType) async {
    if (authType == SCAuthType.GOOGLE.name) {
      this.authType = authType;
      try {
        final signedInUser = await SCGoogleAuthService.signInWithGoogle();
        if (signedInUser == null) {
          return;
        }
        _user = signedInUser;
        uid = _user!.uid;
        SCLoadingManager.show();
        if (uid.isNotEmpty) {
          await DataPersistence.setPendingChannelAuth(authType, uid);
          var user = await SCAccountRepository().loginForChannel(authType, uid);
          if (!context.mounted) {
            SCLoadingManager.hide();
            return;
          }
          AccountStorage().setCurrentUser(user);
          await DataPersistence.clearPendingChannelAuth();
          if (!context.mounted) {
            SCLoadingManager.hide();
            return;
          }
          final canContinue = await SCVersionUtils.checkReview(
            context: context,
          );
          if (!context.mounted || !canContinue) {
            SCLoadingManager.hide();
            return;
          }
          await Provider.of<RtcProvider>(
            context,
            listen: false,
          ).resetLocalRoomState(
            fallbackRtmProvider: Provider.of<RtmProvider>(
              context,
              listen: false,
            ),
          );
          if (!context.mounted) {
            return;
          }
          SCLoadingManager.hide();
          notifyListeners();
          SCNavigatorUtils.push(context, SCRoutes.home, replace: true);
        }
      } catch (e) {
        SCLoadingManager.hide();
        _showAuthError(e);
      }
    } else if (authType == SCAuthType.APPLE.name) {
      this.authType = authType;
      try {
        _authDebugLog('apple sign-in start');
        final isAvailable = await SignInWithApple.isAvailable();
        _authDebugLog('apple sign-in availability=$isAvailable');
        if (!isAvailable) {
          SCTts.show("Sign in with Apple is not available on this device.");
          return;
        }
        final appleCredential = await SignInWithApple.getAppleIDCredential(
          scopes: [
            AppleIDAuthorizationScopes.email,
            AppleIDAuthorizationScopes.fullName, // 请求姓名权限
          ],
        );
        uid = appleCredential.userIdentifier ?? "";
        _authDebugLog(
          'apple credential success userIdentifier=${_maskForDebug(uid)} '
          'hasAuthorizationCode=${appleCredential.authorizationCode.isNotEmpty} '
          'hasIdentityToken=${(appleCredential.identityToken ?? "").isNotEmpty} '
          'hasEmail=${(appleCredential.email ?? "").isNotEmpty}',
        );
        if (uid.isEmpty) {
          SCTts.show("Apple authorization failed. Please try again.");
          return;
        }
        SCLoadingManager.show();
        await DataPersistence.setPendingChannelAuth(authType, uid);
        var user = await SCAccountRepository().loginForChannel(authType, uid);
        if (!context.mounted) {
          SCLoadingManager.hide();
          return;
        }
        AccountStorage().setCurrentUser(user);
        await DataPersistence.clearPendingChannelAuth();
        if (!context.mounted) {
          SCLoadingManager.hide();
          return;
        }
        final canContinue = await SCVersionUtils.checkReview(context: context);
        if (!context.mounted || !canContinue) {
          SCLoadingManager.hide();
          return;
        }
        await Provider.of<RtcProvider>(
          context,
          listen: false,
        ).resetLocalRoomState(
          fallbackRtmProvider: Provider.of<RtmProvider>(context, listen: false),
        );
        if (!context.mounted) {
          return;
        }
        SCLoadingManager.hide();
        notifyListeners();
        SCNavigatorUtils.push(context, SCRoutes.home, replace: true);
      } catch (e) {
        SCLoadingManager.hide();
        _showAuthError(e);
      }
    }
  }

  Future<void> logoutUser() async {
    await SCGoogleAuthService.signOut();
    await DataPersistence.clearPendingChannelAuth();
    _user = null;
    notifyListeners();
  }

  void _showAuthError(Object error) {
    _authDebugLog('authenticateUser error: $error');

    if (error is DioException) {
      return;
    }

    if (error is SignInWithAppleAuthorizationException) {
      _showAppleAuthorizationError(error);
      return;
    }

    if (error is SignInWithAppleNotSupportedException) {
      SCTts.show("Sign in with Apple is not available on this device.");
      return;
    }

    final message = error.toString().replaceFirst("Exception: ", "").trim();
    if (message.isNotEmpty) {
      SCTts.show(message);
    }
  }

  void _showAppleAuthorizationError(
    SignInWithAppleAuthorizationException error,
  ) {
    if (error.code == AuthorizationErrorCode.canceled) {
      return;
    }
    if (error.code == AuthorizationErrorCode.unknown) {
      SCTts.show(
        "Apple sign-in is not available. Please check the app signing profile.",
      );
      return;
    }
    SCTts.show("Apple authorization failed. Please try again.");
  }

  void _authDebugLog(String message) {
    if (kDebugMode) {
      debugPrint('[Auth][Apple] $message');
    }
  }

  String _maskForDebug(String value) {
    if (value.isEmpty) {
      return '<empty>';
    }
    if (value.length <= 8) {
      return '***';
    }
    return '${value.substring(0, 4)}...${value.substring(value.length - 4)}';
  }
}