import 'package:riverpod_annotation/riverpod_annotation.dart';

import '../data/auth_providers.dart';
import '../domain/auth_repository.dart';
import '../domain/auth_state.dart';

part 'auth_controller.g.dart';

/// 登录状态控制器。
@Riverpod(keepAlive: true)
class AuthController extends _$AuthController {
  AuthRepository get _repository => ref.read(authRepositoryProvider);

  @override
  FutureOr<AuthState> build() async {
    final repository = ref.watch(authRepositoryProvider);
    await repository.restore();
    final loggedIn =
        repository.accessToken != null && await repository.hasRefreshToken();
    return AuthState(
      loggedIn: loggedIn,
      restoring: false,
      username: await repository.getUsername(),
    );
  }

  /// 登录：成功返回 true，失败返回 false 并写入错误信息。
  Future<bool> login(String username, String password) async {
    try {
      await _repository.login(username, password);
      state = AsyncData(
        AuthState(loggedIn: true, username: username),
      );
      return true;
    } catch (e) {
      state = AsyncData(
        AuthState(loggedIn: false, error: e.toString()),
      );
      return false;
    }
  }

  /// 退出登录：清空令牌并复位状态。
  Future<void> logout() async {
    await _repository.clear();
    state = const AsyncData(AuthState());
  }

  /// 清空错误信息。
  void clearError() {
    final current = state.valueOrNull;
    if (current != null && current.error != null) {
      state = AsyncData(current.copyWith(error: null));
    }
  }
}