import 'package:flutter/material.dart';
import 'package:seshat/config/constants.dart';
import 'package:seshat/data/repositories/auth_repository.dart';
import 'package:seshat/utils/command.dart';
import 'package:seshat/utils/result.dart';

class LoginViewModel extends ChangeNotifier {
  LoginViewModel({required AuthRepository authRepository})
    : _authRepository = authRepository {
    login = Command1<void, (String username, String password)>(_login);
    load = Command0(_load)..execute();
  }

  final AuthRepository _authRepository;

  /// Command to login with added capabilities
  late Command1 login;

  /// Logins the user with credentials [(String username, String password)]
  Future<Result<void>> _login((String, String) credentials) async {
    final (username, password) = credentials;
    final result = await _authRepository.login(username, password);
    return result;
  }

  /*
 * =================================
 * =====[ COMMAND AND LOADING ]=====
 * =================================
*/

  /// Loads all necessary data
  late final Command0 load;
  bool isLoaded = false;
  bool isUpToDate = false;

  /// Manages loaders
  Future<Result<void>> _load() async {
    final result1 = await _loadApiVersion();
    switch (result1) {
      case Ok():
        isLoaded = true;
        break;
      default:
        break;
    }
    notifyListeners();
    return result1;
  }

  /// Loads the current remote api version and compares to local hardcoded [apiVersion]
  Future<Result<void>> _loadApiVersion() async {
    final result = await _authRepository.getRemoteApiVersion();
    switch (result) {
      case Ok():
        isUpToDate = result.value == apiVersion;
        break;
      default:
        break;
    }
    return result;
  }
}