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 2: 跑腿佣金输入校验
/// 对任意数值输入，当该值小于 1.0 时，订单创建请求应被拒绝。
/// 当该值大于等于 1.0 且小数位不超过 1 位时，订单创建请求应被接受。
/// **Feature: login-and-homepage, Property 2: 跑腿佣金输入校验**
///
/// </summary>
public class CommissionValidationPropertyTests : 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);
    }

    private static CreateOrderRequest MakePickupOrder(decimal commission) => new()
    {
        OrderType = "Pickup",
        ItemName = "测试物品",
        DeliveryLocation = "测试地点",
        Phone = "13800138000",
        Commission = commission
    };

    /// <summary>
    /// 属性：佣金小于 1.0 时，订单创建应被拒绝（返回 400）
    /// </summary>
    [Property(MaxTest = 20)]
    public bool 佣金低于1元时订单创建被拒绝(PositiveInt seed)
    {
        // 生成 0.0 ~ 0.9 之间的佣金值
        var commission = Math.Round((seed.Get % 10) * 0.1m, 1);
        if (commission >= 1.0m) return true; // 跳过不符合条件的值

        var dbName = $"comm_low_{Guid.NewGuid()}";
        using var factory = CreateFactory(dbName);
        var client = factory.CreateClient();
        client.DefaultRequestHeaders.Authorization =
            new AuthenticationHeaderValue("Bearer", GenerateUserToken());

        var request = MakePickupOrder(commission);
        var response = client.PostAsJsonAsync("/api/orders", request).Result;
        return response.StatusCode == HttpStatusCode.BadRequest;
    }

    /// <summary>
    /// 属性：佣金大于等于 1.0 且小数位不超过 1 位时，订单创建应成功（返回 201）
    /// </summary>
    [Property(MaxTest = 20)]
    public bool 合法佣金时订单创建成功(PositiveInt seed)
    {
        // 生成 1.0 ~ 100.0 之间的合法佣金值（1 位小数）
        var commission = Math.Round(1.0m + (seed.Get % 990) * 0.1m, 1);

        var dbName = $"comm_ok_{Guid.NewGuid()}";
        using var factory = CreateFactory(dbName);
        var client = factory.CreateClient();
        client.DefaultRequestHeaders.Authorization =
            new AuthenticationHeaderValue("Bearer", GenerateUserToken());

        var request = MakePickupOrder(commission);
        var response = client.PostAsJsonAsync("/api/orders", request).Result;
        return response.StatusCode == HttpStatusCode.Created;
    }

    /// <summary>
    /// 属性：佣金小数位超过 1 位时，订单创建应被拒绝（返回 400）
    /// </summary>
    [Property(MaxTest = 20)]
    public bool 佣金小数位超过1位时订单创建被拒绝(PositiveInt seed)
    {
        // 生成小数位为 2 位的佣金值，如 1.23, 2.56 等
        var commission = 1.0m + (seed.Get % 900) * 0.01m;
        // 确保确实有超过 1 位小数
        if (commission == Math.Round(commission, 1)) commission += 0.01m;

        var dbName = $"comm_dec_{Guid.NewGuid()}";
        using var factory = CreateFactory(dbName);
        var client = factory.CreateClient();
        client.DefaultRequestHeaders.Authorization =
            new AuthenticationHeaderValue("Bearer", GenerateUserToken());

        var request = MakePickupOrder(commission);
        var response = client.PostAsJsonAsync("/api/orders", request).Result;
        return response.StatusCode == HttpStatusCode.BadRequest;
    }

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