import 'package:flutter/foundation.dart';
import 'package:result_monad/result_monad.dart';
import 'package:shared_preferences/shared_preferences.dart';

import '../friendica_client/friendica_client.dart';
import '../globals.dart';
import '../models/auth/credentials.dart';
import '../models/exec_error.dart';
import 'secrets_service.dart';
import 'timeline_manager.dart';

class AuthService extends ChangeNotifier {
  Credentials? _currentCredentials;
  bool _loggedIn = false;

  bool get loggedIn => _loggedIn && _currentCredentials != null;

  Credentials get currentCredentials => _currentCredentials!;

  Future<bool> getStoredLoginState() async {
    final prefs = await SharedPreferences.getInstance();
    return prefs.getBool('logged-in') ?? false;
  }

  FutureResult<FriendicaClient, ExecError> signIn(
      Credentials credentials) async {
    final client = ProfileClient(credentials);
    final result = await client.getMyProfile();
    if (result.isFailure) {
      await clearCredentials();
      return result.errorCast();
    }

    getIt<SecretsService>().storeCredentials(
      client.credentials.copy(
        userId: result.value.id,
        avatar: result.value.avatarUrl,
      ),
    );
    await _setLoginState(true);
    _currentCredentials = credentials;
    notifyListeners();
    return Result.ok(client);
  }

  Future signOut() async {
    await _setLoginState(false);
    getIt<TimelineManager>().clear();
    _currentCredentials = null;
    notifyListeners();
  }

  Future clearCredentials() async {
    _currentCredentials = null;
    await _setLoginState(false);
    notifyListeners();
  }

  Future<void> _setLoginState(bool state) async {
    final prefs = await SharedPreferences.getInstance();
    await prefs.setBool('logged-in', state);
    _loggedIn = state;
  }
}