using FsCheck;
using FsCheck.Xunit;
using MiAssessment.Core.Interfaces;
using MiAssessment.Core.Services;
using MiAssessment.Model.Data;
using MiAssessment.Model.Models.Payment;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Logging;
using Microsoft.Extensions.Options;
using Moq;
using Xunit;

namespace MiAssessment.Tests.Services;

/// <summary>
/// 微信支付版本路由属性测试
/// **Feature: wechat-pay-v3-upgrade**
/// </summary>
public class WechatPayVersionRoutingPropertyTests
{
    #region Property 4: 版本路由正确性

    /// <summary>
    /// **Feature: wechat-pay-v3-upgrade, Property 4: 版本路由正确性**
    /// *For any* 支付请求，当商户配置的 PayVersion 为 "V3" 时，应该调用 V3 接口；
    /// 当 PayVersion 为 "V2" 时，应该调用 V2 接口。
    /// **Validates: Requirements 3.1, 3.5**
    /// </summary>
    [Property(MaxTest = 100)]
    public bool VersionRouting_ShouldRouteToCorrectService_BasedOnPayVersion(
        NonEmptyString orderNo,
        PositiveInt userId,
        PositiveInt amount,
        bool isV3)
    {
        // Arrange
        var payVersion = isV3 ? "V3" : "V2";
        // 安全地处理订单号，确保不会越界
        var cleanOrderNo = orderNo.Get.Replace("-", "");
        var orderNoStr = $"MYH{(cleanOrderNo.Length > 10 ? cleanOrderNo.Substring(0, 10) : cleanOrderNo)}";
        
        var merchantConfig = new WechatPayMerchantConfig
        {
            Name = "测试商户",
            MchId = "1738725801",
            AppId = "wx1234567890",
            Key = "testkey123456789012345678901234",
            OrderPrefix = "MYH",
            PayVersion = payVersion,
            ApiV3Key = isV3 ? "d1cxc0vXCUH2984901DxddPJMYqcwcnd" : null,
            CertSerialNo = isV3 ? "SERIAL123456" : null,
            PrivateKeyPath = isV3 ? "certs/test/key.pem" : null,
            WechatPublicKeyId = isV3 ? "PUBKEYID123" : null,
            WechatPublicKeyPath = isV3 ? "certs/test/pub.pem" : null,
            NotifyUrl = "https://example.com/notify"
        };

        // 验证版本路由逻辑
        var shouldUseV3 = merchantConfig.PayVersion == "V3";
        
        // 属性：PayVersion 为 "V3" 时应该路由到 V3，否则路由到 V2
        return shouldUseV3 == isV3;
    }

    /// <summary>
    /// **Feature: wechat-pay-v3-upgrade, Property 4: 版本路由正确性**
    /// *For any* 商户配置，PayVersion 只能是 "V2" 或 "V3"，默认为 "V2"。
    /// **Validates: Requirements 3.1, 3.5**
    /// </summary>
    [Fact]
    public void PayVersion_DefaultValue_ShouldBeV2()
    {
        var config = new WechatPayMerchantConfig();
        Assert.Equal("V2", config.PayVersion);
    }

    /// <summary>
    /// **Feature: wechat-pay-v3-upgrade, Property 4: 版本路由正确性**
    /// *For any* V3 配置，必须包含 V3 必要字段才能正确路由。
    /// **Validates: Requirements 3.1**
    /// </summary>
    [Property(MaxTest = 100)]
    public bool V3Config_ShouldHaveRequiredFields_WhenPayVersionIsV3(
        NonEmptyString apiV3Key,
        NonEmptyString certSerialNo,
        NonEmptyString privateKeyPath)
    {
        var config = new WechatPayMerchantConfig
        {
            PayVersion = "V3",
            ApiV3Key = apiV3Key.Get,
            CertSerialNo = certSerialNo.Get,
            PrivateKeyPath = privateKeyPath.Get
        };

        // V3 配置必须有这些字段
        var hasRequiredFields = !string.IsNullOrEmpty(config.ApiV3Key) &&
                               !string.IsNullOrEmpty(config.CertSerialNo) &&
                               !string.IsNullOrEmpty(config.PrivateKeyPath);

        return config.PayVersion == "V3" && hasRequiredFields;
    }

    /// <summary>
    /// **Feature: wechat-pay-v3-upgrade, Property 4: 版本路由正确性**
    /// *For any* V2 配置，V3 字段可以为空。
    /// **Validates: Requirements 3.5**
    /// </summary>
    [Fact]
    public void V2Config_ShouldWorkWithoutV3Fields()
    {
        var config = new WechatPayMerchantConfig
        {
            Name = "V2商户",
            MchId = "1234567890",
            AppId = "wx1234567890",
            Key = "v2key12345678901234567890123456",
            PayVersion = "V2",
            // V3 字段为空
            ApiV3Key = null,
            CertSerialNo = null,
            PrivateKeyPath = null
        };

        // V2 配置不需要 V3 字段
        Assert.Equal("V2", config.PayVersion);
        Assert.Null(config.ApiV3Key);
        Assert.Null(config.CertSerialNo);
        Assert.Null(config.PrivateKeyPath);
    }

    /// <summary>
    /// **Feature: wechat-pay-v3-upgrade, Property 4: 版本路由正确性**
    /// 测试版本路由决策逻辑的正确性。
    /// **Validates: Requirements 3.1, 3.5**
    /// </summary>
    [Theory]
    [InlineData("V3", true)]
    [InlineData("V2", false)]
    [InlineData("v3", false)] // 大小写敏感
    [InlineData("v2", false)] // 大小写敏感
    [InlineData("", false)]
    [InlineData(null, false)]
    public void VersionRouting_Decision_ShouldBeCorrect(string? payVersion, bool expectedV3Route)
    {
        // 版本路由决策逻辑
        var shouldRouteToV3 = payVersion == "V3";
        
        Assert.Equal(expectedV3Route, shouldRouteToV3);
    }

    /// <summary>
    /// **Feature: wechat-pay-v3-upgrade, Property 4: 版本路由正确性**
    /// *For any* 订单号前缀，版本路由应该基于商户配置而非订单号。
    /// **Validates: Requirements 3.1, 3.5**
    /// </summary>
    [Property(MaxTest = 100)]
    public bool VersionRouting_ShouldBeBasedOnMerchantConfig_NotOrderNo(
        NonEmptyString orderPrefix,
        bool isV3)
    {
        // 安全地处理订单前缀
        var prefix = orderPrefix.Get.Length >= 3 ? orderPrefix.Get.Substring(0, 3) : orderPrefix.Get.PadRight(3, 'X');
        
        // 创建两个商户配置，一个 V2，一个 V3
        var v2Config = new WechatPayMerchantConfig
        {
            OrderPrefix = prefix,
            PayVersion = "V2"
        };

        var v3Config = new WechatPayMerchantConfig
        {
            OrderPrefix = prefix,
            PayVersion = "V3"
        };

        // 相同的订单前缀，不同的版本配置
        // 版本路由应该基于 PayVersion 字段
        var v2ShouldRouteToV3 = v2Config.PayVersion == "V3";
        var v3ShouldRouteToV3 = v3Config.PayVersion == "V3";

        return !v2ShouldRouteToV3 && v3ShouldRouteToV3;
    }

    #endregion
}