import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../core/exceptions.dart';
import 'api_client_provider.dart';
import 'settings_provider.dart';

enum AuthStatus { unknown, authenticated, unauthenticated, offline }

final authProvider = NotifierProvider<AuthNotifier, AuthStatus>(AuthNotifier.new);

class AuthNotifier extends Notifier<AuthStatus> {
  @override
  AuthStatus build() => AuthStatus.unknown;

  Future<void> verify() async {
    try {
      final repo = ref.read(authRepositoryProvider);
      final ok = await repo.verify();
      if (ok) {
        await ref.read(hasEverLoggedInProvider.notifier).markLoggedIn();
      }
      state = ok ? AuthStatus.authenticated : AuthStatus.unauthenticated;
    } on NetworkException {
      state = AuthStatus.offline;
    } catch (_) {
      state = AuthStatus.unauthenticated;
    }
  }

  Future<void> login(String username, String password) async {
    final repo = ref.read(authRepositoryProvider);
    await repo.login(username, password);
    await ref.read(hasEverLoggedInProvider.notifier).markLoggedIn();
    state = AuthStatus.authenticated;
  }

  Future<void> logout() async {
    try {
      final repo = ref.read(authRepositoryProvider);
      await repo.logout();
    } finally {
      state = AuthStatus.unauthenticated;
    }
  }
}