import 'dart:convert';
import 'package:flutter/services.dart';

class ReceiptHelper {
  static const _channel = MethodChannel('cn.banxe.appframe/receipt');

  /// 获取 Base64 编码的收据数据，直接可用于 /verifyReceipt
  static Future<String> getBase64Receipt() async {
    try {
      final String? base64 = await _channel.invokeMethod('getReceipt');
      if (base64 == null || base64.isEmpty) {
        throw Exception('收据为空，请先刷新收据');
      }
      return base64;
    } on MissingPluginException {
      throw Exception('原生插件未注册，请检查 iOS 代码');
    }
  }

  /// 强制刷新收据（沙盒环境常需要）
  static Future<void> refreshReceipt() async {
    try {
      await _channel.invokeMethod('refreshReceipt');
    } catch (e) {
      throw Exception('刷新收据失败: $e');
    }
  }
}