import 'package:flutter/foundation.dart';
import 'package:seshat/data/services/auth_client.dart';
import 'package:seshat/utils/result.dart';

/// Repository to manage authentification
class AuthRepository extends ChangeNotifier {
  AuthRepository({required AuthClient authClient}) : _authClient = authClient;

  final AuthClient _authClient;

  bool? _isAuthenticated;

  /// Checks the validity of the token if not already checked
  Future<bool> get isLoggedIn async {
    if (_isAuthenticated != null) {
      return _isAuthenticated!;
    }
    final result = await _authClient.hasValidToken();
    switch (result) {
      case Ok():
        if (result.value) {
          return true;
        }
        return false;
      case Error():
        return false;
    }
  }

  /// Logs in the user
  Future<Result<void>> login(String username, String password) async {
    try {
      final result = await _authClient.login(username, password);
      switch (result) {
        case Ok():
          _isAuthenticated = true;
          return Result.ok(());
        case Error():
          return result;
      }
    } catch (e) {
      return Result.error(Exception(e));
    }
  }

  /// Gets the API's remote version
  Future<Result<int>> getRemoteApiVersion() async {
    return await _authClient.getRemoteApiVersion();
  }
}