// Author: fruit.com.cn

import 'package:flutter/foundation.dart';

import '../../core/data/remote/api_client.dart';
import '../../core/data/repositories/account_repository.dart';

/// 注销申请与撤销状态。
class AccountDeactivateLogic extends ChangeNotifier {
  AccountDeactivateLogic(this._repository, {required this.clearSession});

  static const maxReasonLength = 200;

  final AccountRepository _repository;
  final Future<void> Function() clearSession;
  DateTime? scheduledAt;
  bool requesting = false;
  bool cancelling = false;
  String? error;
  String? actionMessage;
  bool cancelSucceeded = false;
  bool _disposed = false;

  /// 申请注销；成功后立即清理本地会话。
  Future<bool> request(String reason) async {
    requesting = true;
    error = null;
    cancelSucceeded = false;
    _notify();
    try {
      scheduledAt = await _repository.deactivate(
        reason.trim().substring(
          0,
          reason.trim().length > maxReasonLength
              ? maxReasonLength
              : reason.trim().length,
        ),
      );
      await clearSession();
      return true;
    } catch (failure) {
      error = failure is ApiException
          ? failure.message
          : 'accountDeactivateFailed';
      return false;
    } finally {
      requesting = false;
      _notify();
    }
  }

  /// 撤销待处理申请；失败时保留后端文案。
  Future<bool> cancel() async {
    cancelling = true;
    actionMessage = null;
    cancelSucceeded = false;
    _notify();
    try {
      await _repository.cancelDeactivation();
      cancelSucceeded = true;
      return true;
    } catch (failure) {
      actionMessage = failure is ApiException
          ? failure.message
          : 'accountCancelFailed';
      return false;
    } finally {
      cancelling = false;
      _notify();
    }
  }

  void _notify() {
    if (!_disposed) notifyListeners();
  }

  @override
  void dispose() {
    _disposed = true;
    super.dispose();
  }
}