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

namespace CampusErrand.Tests;

/// <summary>
/// Property 5: Banner 列表排序与过滤
/// 对任意 Banner 数据集合，前端获取接口应仅返回 IsEnabled=true 的记录，且按 SortOrder 升序排列。
/// **Feature: login-and-homepage, Property 5: Banner 列表排序与过滤**
///
/// </summary>
public class BannerListPropertyTests : IDisposable
{
    private const string JwtSecret = "YourSuperSecretKeyForJwtTokenGeneration_AtLeast32Chars!";
    private const string JwtIssuer = "CampusErrand";
    private const string JwtAudience = "CampusErrandApp";

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

    /// <summary>
    /// 创建使用内存数据库的测试工厂
    /// </summary>
    private WebApplicationFactory<Program> CreateFactory(string dbName)
    {
        var factory = new WebApplicationFactory<Program>()
            .WithWebHostBuilder(builder =>
            {
                builder.ConfigureServices(services =>
                {
                    // 移除 EF Core 相关服务
                    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;
    }

    /// <summary>
    /// 生成管理员 JWT
    /// </summary>
    private static string GenerateAdminToken()
    {
        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, "1"),
            new System.Security.Claims.Claim(System.Security.Claims.ClaimTypes.Role, "Admin")
        };
        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：前端 Banner 接口仅返回已启用的记录，且按 SortOrder 升序排列
    /// </summary>
    [Property(MaxTest = 20)]
    public bool 前端Banner接口仅返回启用记录且按排序权重升序(NonEmptyArray<byte> sortOrders, NonEmptyArray<bool> enabledFlags)
    {
        var dbName = $"banner_list_{Guid.NewGuid()}";
        using var factory = CreateFactory(dbName);

        // 准备测试数据：通过管理员接口插入 Banner
        using (var scope = factory.Services.CreateScope())
        {
            var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();
            var count = Math.Min(sortOrders.Get.Length, enabledFlags.Get.Length);
            for (int i = 0; i < count; i++)
            {
                db.Banners.Add(new Banner
                {
                    ImageUrl = $"https://img.example.com/{i}.png",
                    LinkType = LinkType.External,
                    LinkUrl = $"https://example.com/{i}",
                    SortOrder = sortOrders.Get[i],
                    IsEnabled = enabledFlags.Get[i],
                    CreatedAt = DateTime.UtcNow
                });
            }
            db.SaveChanges();
        }

        // 调用前端接口
        var client = factory.CreateClient();
        var response = client.GetAsync("/api/banners").Result;
        if (response.StatusCode != HttpStatusCode.OK) return false;

        var banners = response.Content.ReadFromJsonAsync<List<BannerResponse>>().Result!;

        // 验证：所有返回的 Banner 都是启用的
        if (banners.Any(b => !b.IsEnabled)) return false;

        // 验证：按 SortOrder 升序排列
        for (int i = 1; i < banners.Count; i++)
        {
            if (banners[i].SortOrder < banners[i - 1].SortOrder) return false;
        }

        // 验证：返回数量等于启用的 Banner 数量
        var count2 = Math.Min(sortOrders.Get.Length, enabledFlags.Get.Length);
        var expectedEnabledCount = enabledFlags.Get.Take(count2).Count(f => f);
        return banners.Count == expectedEnabledCount;
    }

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