121 lines
3.1 KiB
Dart
121 lines
3.1 KiB
Dart
import 'package:flutter/foundation.dart';
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import 'license_service.dart';
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import 'models.dart';
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import 'order_api.dart';
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import 'payment_service.dart';
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enum PayState { idle, loading, success, failed }
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@immutable
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class PaywallUiState {
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final PayState state;
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final String? message;
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final Plan? selectedPlan;
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const PaywallUiState({
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this.state = PayState.idle,
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this.message,
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this.selectedPlan,
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});
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}
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class PaywallViewModel extends ChangeNotifier {
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final OrderApi orderApi;
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final LicenseService licenseService;
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final Map<PayChannel, PaymentService> services;
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PaywallUiState _state = const PaywallUiState();
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PaywallUiState get state => _state;
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List<Plan> _plans = const [];
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bool _plansLoading = false;
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String? _plansError;
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/// 套餐价格方案（来自后端，客户端不硬编码）
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List<Plan> get plans => _plans;
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bool get plansLoading => _plansLoading;
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String? get plansError => _plansError;
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PaywallViewModel({
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required this.orderApi,
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required this.licenseService,
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required this.services,
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});
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/// 进充值页时拉取套餐；已有数据或加载中跳过，失败可重试
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Future<void> loadPlans() async {
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if (_plans.isNotEmpty || _plansLoading) return;
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_plansLoading = true;
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_plansError = null;
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notifyListeners();
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try {
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_plans = await orderApi.fetchPlans();
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} on SessionExpiredException {
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_plansError = '登录已失效，请重新登录后再充值';
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} on OrderApiException catch (e) {
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_plansError = e.message;
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} finally {
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_plansLoading = false;
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notifyListeners();
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}
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}
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void selectPlan(Plan? plan) {
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_state = PaywallUiState(selectedPlan: plan);
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notifyListeners();
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}
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/// 发起支付；成功后刷新授权并通知页面进入相机
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Future<LicenseStatus?> pay(PayChannel channel) async {
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final plan = _state.selectedPlan;
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if (plan == null) return null;
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final service = services[channel];
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if (service == null) return null;
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_state = PaywallUiState(state: PayState.loading, selectedPlan: plan);
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notifyListeners();
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try {
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final result = await service.pay(plan, channel);
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if (!result.success) {
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_state = PaywallUiState(
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state: PayState.failed,
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message: result.message ?? '支付失败，请重试',
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selectedPlan: plan,
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);
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notifyListeners();
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return null;
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}
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final license = await licenseService.refresh();
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_state = PaywallUiState(
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state: PayState.success,
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selectedPlan: plan,
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);
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notifyListeners();
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return license;
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} on SessionExpiredException {
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_state = PaywallUiState(
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state: PayState.failed,
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message: '登录已失效，请重新登录后再充值',
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selectedPlan: plan,
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);
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notifyListeners();
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return null;
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} on OrderApiException catch (e) {
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_state = PaywallUiState(
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state: PayState.failed,
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message: '支付不可用: ${e.message}',
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selectedPlan: plan,
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);
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notifyListeners();
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return null;
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}
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}
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void reset() {
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_state = const PaywallUiState();
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notifyListeners();
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}
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}
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