flutter_paydemo/lib/service/platform/stripe_flow.dart

/// Stripe 流程封装（flutter_stripe 11.x）
///
/// 覆盖三种入口：
/// 1. PaymentSheet（标准卡支付）
/// 2. Apple Pay（confirmPlatformPayPaymentIntent）
/// 3. Google Pay（confirmPlatformPayPaymentIntent）
library;

import 'package:flutter_stripe/flutter_stripe.dart';

import '../../models/payment.dart';

/// Stripe 封装：初始化 + PaymentSheet + Apple/Google Pay
class StripeFlow {
  StripeFlow._();

  static final StripeFlow instance = StripeFlow._();

  /// 设置发布密钥（App 启动时调用；真实接入以后端下发为准）
  void init(String publishableKey) {
    Stripe.publishableKey = publishableKey;
  }

  /// 是否 Mock 模式（后端下发 pk_test_mock 时，无法弹原生面板）
  static bool isMock(StripePaymentCreatedResponse created) =>
      created.publishableKey.startsWith('pk_test_mock');

  /// 初始化并展示 PaymentSheet
  /// [created] 后端 createStripePayment 响应
  Future<void> presentPaymentSheet(StripePaymentCreatedResponse created) async {
    // 真实密钥由后端下发时动态更新
    if (created.publishableKey.isNotEmpty) {
      Stripe.publishableKey = created.publishableKey;
    }

    await Stripe.instance.initPaymentSheet(
      paymentSheetParameters: SetupPaymentSheetParameters(
        merchantDisplayName: 'flutter_paydemo 演示商店',
        customerId: created.customer,
        paymentIntentClientSecret: created.paymentIntent,
        customerEphemeralKeySecret: created.ephemeralKey,
        // Apple / Google Pay 开关见对应方法
        applePay: const PaymentSheetApplePay(merchantCountryCode: 'US'),
        googlePay: const PaymentSheetGooglePay(
          merchantCountryCode: 'US',
          testEnv: true,
        ),
      ),
    );
    await Stripe.instance.presentPaymentSheet();
  }

  /// 探测 Apple Pay 是否可用（iOS/Safari）
  Future<bool> isApplePaySupported() {
    return Stripe.instance.isPlatformPaySupported();
  }

  /// 探测 Google Pay 是否可用（Android/Chrome）
  Future<bool> isGooglePaySupported() {
    return Stripe.instance.isPlatformPaySupported(
      googlePay: const IsGooglePaySupportedParams(testEnv: true),
    );
  }

  /// 确认 Apple Pay 支付
  Future<void> confirmApplePay(
    StripePaymentCreatedResponse created,
    String productName,
    int amountUsdCents,
  ) async {
    await Stripe.instance.confirmPlatformPayPaymentIntent(
      clientSecret: created.paymentIntent,
      confirmParams: PlatformPayConfirmParams.applePay(
        applePay: ApplePayParams(
          cartItems: [
            ApplePayCartSummaryItem.immediate(
              label: productName,
              amount: (amountUsdCents / 100).toStringAsFixed(2),
            ),
          ],
          merchantCountryCode: 'US',
          currencyCode: 'USD',
        ),
      ),
    );
  }

  /// 确认 Google Pay 支付
  Future<void> confirmGooglePay(
    StripePaymentCreatedResponse created,
    String productName,
    int amountUsdCents,
  ) async {
    await Stripe.instance.confirmPlatformPayPaymentIntent(
      clientSecret: created.paymentIntent,
      confirmParams: PlatformPayConfirmParams.googlePay(
        googlePay: GooglePayParams(
          testEnv: true,
          merchantName: productName,
          merchantCountryCode: 'US',
          currencyCode: 'USD',
        ),
      ),
    );
  }
}