import 'package:flutter/material.dart';
import 'package:tm_app/core/utils/result.dart';

import '../data/repositories/auth_repository.dart';
import '../data/services/model/verify_otp_response/verify_otp_response_model.dart';

class VerifyOtpViewModel with ChangeNotifier {
  final AuthRepository _authRepository;

  VerifyOtpViewModel({required AuthRepository authRepository})
    : _authRepository = authRepository {
    otpController.addListener(_onTextChanged);
  }

  final TextEditingController otpController = TextEditingController();

  final FocusNode otpFocus = FocusNode();

  bool _isLoading = false;
  String? _errorMessage;
  String? _successMessage;
  bool _verifyOtpSuccess = false;
  String? _resetToken;

  bool get isLoading => _isLoading;
  String? get errorMessage => _errorMessage;
  String? get successMessage => _successMessage;
  bool get verifyOtpSuccess => _verifyOtpSuccess;
  String? get resetToken => _resetToken;

  Future<void> verifyOtp({required String email}) async {
    _isLoading = true;
    _errorMessage = null;
    _verifyOtpSuccess = false;
    notifyListeners();

    final result = await _authRepository.verifyOtp(
      code: otpController.text.trim(),
      email: email,
    );

    switch (result) {
      case Ok<VerifyOtpResponseModel>():
        _isLoading = false;
        _resetToken = result.value.data.token;
        _successMessage = result.value.message;
        _verifyOtpSuccess = true;
        notifyListeners();

        break;

      case Error<VerifyOtpResponseModel>():
        _isLoading = false;
        _errorMessage = result.error.toString();
        _verifyOtpSuccess = false;
        notifyListeners();
        break;
    }

    _errorMessage = null;
    _successMessage = null;
    notifyListeners();
  }

  void clearOtpFlow() {
    _errorMessage = null;
    _successMessage = null;
    _isLoading = false;
    _verifyOtpSuccess = false;
    // Intentionally do not clear resetToken
    otpController.clear();
    notifyListeners();
  }

  void _onTextChanged() {
    notifyListeners();
  }

  bool get isOtpValid {
    final otp = otpController.text.trim();
    return otp.length == 6;
  }

  bool get canSubmitOtpPage {
    return isOtpValid;
  }

  @override
  void dispose() {
    otpController.dispose();
    otpFocus.dispose();
    super.dispose();
  }
}