import 'dart:async';

import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:equatable/equatable.dart';
import 'package:user_repository/user_repository.dart';

part 'auth_event.dart';
part 'auth_state.dart';

class AuthBloc extends Bloc<AuthEvent, AuthState> {
  final UserRepository _userRepository;
  final PhoneVerificationService phoneVerificationService =
      PhoneVerificationService();
  String? _verificationId;

  AuthBloc({required UserRepository userRepository})
      : _userRepository = userRepository,
        super(AuthStateInitial()) {
    on<AuthEventLoginOAuth>(_onAuthEventLoginOAuth);
    on<AuthEventVerifyOAuth>(_onAuthEventVerifyOAuth);
    on<AuthEventAddEmailAndPassword>(_onAuthEventAddEmailAndPassword);
    on<AuthEventUpdatePassword>(_updatePassword);
    on<LinkWithPhoneNumber>(_linkWithPhoneNumber);
    on<LinkWithPhoneNumberOtp>(_linkWithPhoneNumberOtp);
  }

  void _onAuthEventLoginOAuth(
      AuthEventLoginOAuth event, Emitter<AuthState> emit) async {
    emit(AuthStateProcess());
    try {
      await _userRepository.signInWithPhoneNumber(event.phone);

      emit(const AuthStateVerifyOAuth(false));
    } catch (e) {
      emit(const AuthStateFailure());
    }
  }

  void _onAuthEventVerifyOAuth(
      AuthEventVerifyOAuth event, Emitter<AuthState> emit) async {
    emit(AuthStateProcess());
    try {
      final bool isVerified = await _userRepository.verifyOTP(event.code);

      if (isVerified) {
        emit(AuthStateSuccess());
      } else {
        emit(const AuthStateVerifyOAuth(true));
      }
    } catch (e) {
      emit(const AuthStateFailure());
    }
  }

  void _onAuthEventAddEmailAndPassword(
      AuthEventAddEmailAndPassword event, Emitter<AuthState> emit) async {
    emit(AuthStateProcess());
    try {
      final String? error = await _userRepository.addEmailAndPassword(
          event.email, event.password);
      if (error == null) {
        emit(AuthStateSuccess());
      } else {
        if (error == 'requires-recent-login') {
          emit(AuthStateRequiresRecentLogin());
        } else if (error == 'email-already-in-use') {
          emit(AuthStateEmailAlreadyInUse());
        } else {
          emit(const AuthStateFailure());
        }
      }
    } catch (e) {
      emit(const AuthStateFailure());
    }
  }

  void _updatePassword(
      AuthEventUpdatePassword event, Emitter<AuthState> emit) async {
    emit(AuthStateProcess());
    try {
      final error = await _userRepository.updatePassword(
          event.actualPassword, event.password);
      if (error == null) {
        emit(AuthStateSuccess());
      } else {
        switch (error) {
          case UpdatePassworErros.credentialsWrong:
            emit(const AuthStateFailure(message: "Contrasena incorrecta"));
            break;
          case UpdatePassworErros.userNotFound:
            emit(const AuthStateFailure(message: "Usuario no encontrado"));
            break;
          case UpdatePassworErros.unknown:
            emit(const AuthStateFailure(message: "Error inesperado."));
            break;
        }
      }
    } catch (e) {
      emit(const AuthStateFailure(message: "Error inesperado."));
    }
  }

  void _linkWithPhoneNumber(
      LinkWithPhoneNumber event, Emitter<AuthState> emit) async {
    emit(AuthStateProcess());

    try {
      await for (PhoneAuthEvent event
          in phoneVerificationService.verifyPhoneNumber(event.phoneNumber)) {
        switch (event.type) {
          case PhoneAuthEventType.verificationCompleted:
            final credential = event.data;
            print('Verificacion completada. Credencial: $credential');
            break;
          case PhoneAuthEventType.verificationFailed:
            final exception = event.data;
            print('Verificacion fallida. Excepcion: $exception');
            emit(AuthStateFailure(message: "Error inesperado. $exception"));
            return;
          case PhoneAuthEventType.codeAutoRetrievalTimeout:
            final verificationId = event.data as String;
            print('Tiempo de espera agotado. ID: $verificationId');
            emit(const AuthStateFailure(
              message: "Tiempo de espera agotado.",
            ));
            break;
          case PhoneAuthEventType.codeSent:
            final eventData = event.data as Map<String, dynamic>;
            final verificationId = eventData['verificationId'] as String;
            final resendToken = eventData['resendToken'] as int?;
            print('Codigo enviado. ID: $verificationId, resendToken: $resendToken');
            _verificationId = verificationId;
            emit(const AuthStateVerifyOAuth(false));
            break;
        }
      }
    } catch (e) {
      emit(const AuthStateFailure(message: "Error inesperado."));
    }
  }

  void _linkWithPhoneNumberOtp(
      LinkWithPhoneNumberOtp event, Emitter<AuthState> emit) async {
    emit(AuthStateProcess());
    try {
      final bool isVerified = await _userRepository.linkWithOTP(
          event.phoneNumber, _verificationId ?? '', event.code);

      if (isVerified) {
        emit(AuthStateSuccess());
      } else {
        emit(const AuthStateVerifyOAuth(true));
      }
    } catch (e) {
      emit(AuthStateFailure(message: "Error inesperado. $e"));
    }
  }
}