using System.Net;
using System.Net.Http.Headers;
using System.Net.Http.Json;
using CampusErrand.Data;
using CampusErrand.Models;
using CampusErrand.Models.Dtos;
using FsCheck;
using FsCheck.Xunit;
using Microsoft.AspNetCore.Mvc.Testing;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.DependencyInjection;

namespace CampusErrand.Tests;

/// <summary>
/// Property 10: 订单大厅佣金排序
/// 对任意订单列表，当选择佣金优先排序时，返回的订单应按佣金金额从高到低排列。
/// **Feature: login-and-homepage, Property 10: 订单大厅佣金排序**
/// **Validates: Requirements 11.4**
/// </summary>
public class OrderHallSortPropertyTests : IDisposable
{
    private const string JwtSecret = "YourSuperSecretKeyForJwtTokenGeneration_AtLeast32Chars!";
    private const string JwtIssuer = "CampusErrand";
    private const string JwtAudience = "CampusErrandApp";

    private readonly List<WebApplicationFactory<Program>> _factories = [];

    private WebApplicationFactory<Program> CreateFactory(string dbName)
    {
        var factory = new WebApplicationFactory<Program>()
            .WithWebHostBuilder(builder =>
            {
                builder.ConfigureServices(services =>
                {
                    var efDescriptors = services
                        .Where(d =>
                            d.ServiceType.FullName?.Contains("EntityFrameworkCore") == true
                            || d.ServiceType == typeof(DbContextOptions<AppDbContext>)
                            || d.ServiceType == typeof(DbContextOptions)
                            || d.ImplementationType?.FullName?.Contains("EntityFrameworkCore") == true)
                        .ToList();
                    foreach (var d in efDescriptors) services.Remove(d);

                    services.AddDbContext<AppDbContext>(options =>
                        options.UseInMemoryDatabase(dbName));
                });
            });
        _factories.Add(factory);
        return factory;
    }

    private static string GenerateUserToken(int userId = 1)
    {
        var key = new Microsoft.IdentityModel.Tokens.SymmetricSecurityKey(
            System.Text.Encoding.UTF8.GetBytes(JwtSecret));
        var credentials = new Microsoft.IdentityModel.Tokens.SigningCredentials(
            key, Microsoft.IdentityModel.Tokens.SecurityAlgorithms.HmacSha256);
        var claims = new[]
        {
            new System.Security.Claims.Claim(System.Security.Claims.ClaimTypes.NameIdentifier, userId.ToString()),
            new System.Security.Claims.Claim(System.Security.Claims.ClaimTypes.Role, "User")
        };
        var token = new System.IdentityModel.Tokens.Jwt.JwtSecurityToken(
            issuer: JwtIssuer, audience: JwtAudience, claims: claims,
            expires: DateTime.UtcNow.AddHours(1), signingCredentials: credentials);
        return new System.IdentityModel.Tokens.Jwt.JwtSecurityTokenHandler().WriteToken(token);
    }

    /// <summary>
    /// 属性：佣金优先排序时，订单按佣金从高到低排列
    /// </summary>
    [Property(MaxTest = 20)]
    public bool 佣金优先排序时订单按佣金从高到低排列(PositiveInt seed)
    {
        var dbName = $"hall_sort_{Guid.NewGuid()}";
        using var factory = CreateFactory(dbName);

        // 插入多个 Pending 状态订单，佣金各不相同
        using (var scope = factory.Services.CreateScope())
        {
            var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
            var rng = new Random(seed.Get);
            var count = rng.Next(2, 10);

            for (int i = 0; i < count; i++)
            {
                // 生成 1.0 ~ 50.0 之间的合法佣金（1 位小数）
                var commission = Math.Round(1.0m + rng.Next(0, 490) * 0.1m, 1);
                db.Orders.Add(new Order
                {
                    OrderNo = $"ORD{Guid.NewGuid():N}"[..20],
                    OwnerId = 99,
                    OrderType = OrderType.Pickup,
                    Status = OrderStatus.Pending,
                    ItemName = $"物品{i}",
                    DeliveryLocation = "测试地点",
                    Phone = "13800138000",
                    Commission = commission,
                    TotalAmount = commission,
                    CreatedAt = DateTime.UtcNow
                });
            }
            db.SaveChanges();
        }

        // 调用订单大厅接口（默认佣金优先排序）
        var client = factory.CreateClient();
        client.DefaultRequestHeaders.Authorization =
            new AuthenticationHeaderValue("Bearer", GenerateUserToken());

        var response = client.GetAsync("/api/orders/hall?sort=commission").Result;
        if (response.StatusCode != HttpStatusCode.OK) return false;

        var orders = response.Content.ReadFromJsonAsync<List<OrderHallItemResponse>>().Result!;

        // 验证：按佣金从高到低排列
        for (int i = 1; i < orders.Count; i++)
        {
            if (orders[i].Commission > orders[i - 1].Commission) return false;
        }

        return true;
    }

    public void Dispose()
    {
        foreach (var f in _factories) f.Dispose();
        _factories.Clear();
    }
}