import 'package:flutter_bloc/flutter_bloc.dart';
import '../../core/services/storage_service.dart';
import '../../core/utils/app_logger.dart';
import '../../data/models/teacher_models.dart';
import '../../data/repositories/teacher_repository.dart';

abstract class TeacherAuthState {}

class TeacherAuthInitial extends TeacherAuthState {}
class TeacherAuthLoading extends TeacherAuthState {}

class TeacherAuthOtpSent extends TeacherAuthState {
  final String phoneNumber;
  TeacherAuthOtpSent({required this.phoneNumber});
}

class TeacherAuthenticated extends TeacherAuthState {
  final TeacherProfileModel profile;
  TeacherAuthenticated({required this.profile});
}

class TeacherUnauthenticated extends TeacherAuthState {}

class TeacherAuthError extends TeacherAuthState {
  final String message;
  TeacherAuthError(this.message);
}

class TeacherAuthCubit extends Cubit<TeacherAuthState> {
  final TeacherRepository repository;
  final StorageService _storage;

  TeacherAuthCubit({
    required this.repository,
    StorageService? storage,
  })  : _storage = storage ?? StorageService(),
        super(TeacherAuthInitial());

  Future<void> checkSession() async {
    AppLogger.log('Checking Teacher Session...', tag: 'TEACHER_AUTH');
    emit(TeacherAuthLoading());
    try {
      final token = await _storage.getToken();
      if (token == null || token.isEmpty) {
        AppLogger.log('No teacher token -> Unauthenticated', tag: 'TEACHER_AUTH');
        emit(TeacherUnauthenticated());
        return;
      }

      final profile = await repository.getProfileStatus();
      AppLogger.log('Teacher authenticated: ${profile.name} (${profile.specialization})', tag: 'TEACHER_AUTH');
      emit(TeacherAuthenticated(profile: profile));
    } catch (e) {
      AppLogger.error('Session check failed', error: e, tag: 'TEACHER_AUTH');
      emit(TeacherUnauthenticated());
    }
  }

  void resetToPhone() {
    emit(TeacherUnauthenticated());
  }

  Future<void> sendOtp(String phoneNumber) async {
    emit(TeacherAuthLoading());
    try {
      final res = await repository.requestOtp(phoneNumber);
      if (res['status'] == 'success') {
        emit(TeacherAuthOtpSent(phoneNumber: phoneNumber));
      } else {
        emit(TeacherAuthError(res['message']?.toString() ?? 'فشل إرسال رمز التحقق'));
      }
    } catch (e) {
      emit(TeacherAuthError(e.toString()));
    }
  }

  Future<void> verifyOtp(
    String phoneNumber,
    String otp, {
    String? fullName,
    String? specialization,
    String? schoolName,
    List<String>? gradesTaught,
  }) async {
    emit(TeacherAuthLoading());
    try {
      final res = await repository.verifyOtp(phoneNumber, otp, fullName: fullName);
      if (res['status'] == 'success') {
        if ((fullName ?? '').trim().isNotEmpty && (specialization ?? '').trim().isNotEmpty && (schoolName ?? '').trim().isNotEmpty && (gradesTaught?.isNotEmpty ?? false)) {
          try {
            await repository.setupProfile(
              fullName: fullName!.trim(),
              specialization: specialization!.trim(),
              schoolName: schoolName!.trim(),
              gradesTaught: gradesTaught!,
              bio: '',
            );
          } catch (_) {}
        }
        final profile = await repository.getProfileStatus();
        emit(TeacherAuthenticated(profile: profile));
      } else {
        emit(TeacherAuthError(res['message']?.toString() ?? 'رمز التحقق غير صحيح'));
      }
    } catch (e) {
      emit(TeacherAuthError(e.toString()));
    }
  }

  Future<void> updateProfile({
    required String fullName,
    required String specialization,
    required String schoolName,
    required List<String> gradesTaught,
    required String bio,
  }) async {
    emit(TeacherAuthLoading());
    try {
      final updated = await repository.setupProfile(
        fullName: fullName,
        specialization: specialization,
        schoolName: schoolName,
        gradesTaught: gradesTaught,
        bio: bio,
      );
      emit(TeacherAuthenticated(profile: updated));
    } catch (e) {
      emit(TeacherAuthError(e.toString()));
    }
  }

  Future<void> logout() async {
    emit(TeacherAuthLoading());
    await _storage.clearSession();
    emit(TeacherUnauthenticated());
  }
}