import 'package:get/get.dart';
import 'package:fluwx/fluwx.dart';
import '../../modules/login/controllers/weixinLogin.dart';

/// 支付结果回调
typedef PaymentResultCallback = void Function(bool success, String? message);

/// 支付服务
class PayService extends GetxService {
  late FlWX _flwx;

  @override
  void onInit() {
    super.onInit();
    _flwx = FlWX();
  }

  /// 微信支付
  /// 
  /// [paymentData] 支付参数，包含以下字段：
  /// - appId: 应用ID
  /// - partnerId: 商户号
  /// - prepayId: 预支付交易会话ID
  /// - packageValue: 扩展字段，固定值"Sign=WXPay"
  /// - nonceStr: 随机字符串
  /// - timestamp: 时间戳
  /// - sign: 签名
  /// 
  /// [onResult] 支付结果回调
  Future<bool> wechatPay({
    required Map<String, dynamic> paymentData,
    PaymentResultCallback? onResult,
  }) async {
    try {
      // 检查微信是否安装
      if (!await _flwx.isInstalled) {
        onResult?.call(false, '微信未安装');
        return false;
      }

      // 将支付数据转换为Payment对象
      final payment = paymentData.toPayment();
      if (payment == null) {
        onResult?.call(false, '支付参数格式错误');
        return false;
      }

      // 调用微信支付
      final result = await _flwx.pay(
        payment,
        onSuccess: () {
          onResult?.call(true, '支付成功');
        },
        onResponse: (response) {
          if (response.errCode == 0) {
            onResult?.call(true, '支付成功');
          } else if (response.errCode == -2) {
            onResult?.call(false, '用户取消支付');
          } else {
            onResult?.call(false, '支付失败: ${response.errStr}');
          }
        },
      );

      return result;
    } catch (e) {
      onResult?.call(false, '支付异常: $e');
      return false;
    }
  }

  /// 创建微信支付订单
  /// 
  /// [orderInfo] 订单信息，包含：
  /// - orderId: 订单ID
  /// - amount: 支付金额（分）
  /// - description: 商品描述
  /// - userId: 用户ID
  /// 
  /// 返回支付参数，用于调用 [wechatPay] 方法
  Future<Map<String, dynamic>?> createWechatPayOrder({
    required String orderId,
    required int amount,
    required String description,
    String? userId,
  }) async {
    try {
      // TODO: 这里需要调用后端API创建支付订单
      // 示例代码，实际需要根据后端接口调整
      
      // final response = await Api.createPayOrder({
      //   'orderId': orderId,
      //   'amount': amount,
      //   'description': description,
      //   'userId': userId,
      //   'payType': 'wechat',
      // });
      
      // if (response['success'] == true) {
      //   return response['data'] as Map<String, dynamic>;
      // }
      
      // 临时返回示例数据结构，实际使用时需要删除
      return {
        'appId': 'your_app_id',
        'partnerId': 'your_partner_id', 
        'prepayId': 'prepay_id_from_server',
        'packageValue': 'Sign=WXPay',
        'nonceStr': 'random_string',
        'timestamp': DateTime.now().millisecondsSinceEpoch ~/ 1000,
        'sign': 'signature_from_server',
      };
    } catch (e) {
      print('创建支付订单失败: $e');
      return null;
    }
  }

  /// 查询支付结果
  /// 
  /// [orderId] 订单ID
  /// 返回支付状态：success, failed, pending
  Future<String?> queryPaymentStatus(String orderId) async {
    try {
      // TODO: 调用后端API查询支付状态
      // final response = await Api.queryPaymentStatus({'orderId': orderId});
      // return response['status'] as String?;
      
      // 临时返回，实际使用时需要删除
      return 'pending';
    } catch (e) {
      print('查询支付状态失败: $e');
      return null;
    }
  }

  /// 完整的支付流程
  /// 
  /// [orderId] 订单ID
  /// [amount] 支付金额（分）
  /// [description] 商品描述
  /// [userId] 用户ID
  /// [onResult] 支付结果回调
  Future<bool> processWechatPayment({
    required String orderId,
    required int amount,
    required String description,
    String? userId,
    PaymentResultCallback? onResult,
  }) async {
    try {
      // 1. 创建支付订单
      final paymentData = await createWechatPayOrder(
        orderId: orderId,
        amount: amount,
        description: description,
        userId: userId,
      );

      if (paymentData == null) {
        onResult?.call(false, '创建支付订单失败');
        return false;
      }

      // 2. 调用微信支付
      return await wechatPay(
        paymentData: paymentData,
        onResult: onResult,
      );
    } catch (e) {
      onResult?.call(false, '支付流程异常: $e');
      return false;
    }
  }
}