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 22: 提现金额校验
/// 对任意提现申请，提现金额应大于等于 1 元、小于等于可提现余额，
/// 且小数位不超过 2 位。不满足条件的申请应被拒绝。
/// **Feature: login-and-homepage, Property 22: 提现金额校验**
///
/// </summary>
public class WithdrawalValidationPropertyTests : 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 GenerateToken(int userId, string role = "User")
    {
        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, role)
        };
        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>
    /// 为用户准备可提现收益
    /// </summary>
    private void SeedAvailableEarnings(WebApplicationFactory<Program> factory, int userId, decimal amount, string suffix)
    {
        using var scope = factory.Services.CreateScope();
        var db = scope.ServiceProvider.GetRequiredService<AppDbContext>();

        db.Users.Add(new User
        {
            Id = userId, OpenId = $"user_{suffix}", Phone = "13900000001",
            Nickname = "测试用户", Role = UserRole.Runner, CreatedAt = DateTime.UtcNow
        });

        // 创建一个关联订单
        var order = new Order
        {
            OrderNo = $"ORD{suffix}"[..Math.Min(20, 3 + suffix.Length)],
            OwnerId = 999, OrderType = OrderType.Pickup, Status = OrderStatus.Completed,
            ItemName = "测试", DeliveryLocation = "测试", Phone = "13800138000",
            Commission = amount, TotalAmount = amount, CreatedAt = DateTime.UtcNow
        };
        db.Orders.Add(order);
        db.SaveChanges();

        // 创建可提现收益记录
        db.Earnings.Add(new Earning
        {
            UserId = userId,
            OrderId = order.Id,
            Commission = amount,
            PlatformFee = 0,
            NetEarning = amount,
            Status = EarningStatus.Available,
            FrozenUntil = DateTime.UtcNow.AddDays(-1),
            CreatedAt = DateTime.UtcNow
        });
        db.SaveChanges();
    }

    private static WithdrawRequest MakeWithdrawRequest(decimal amount) => new()
    {
        Amount = amount,
        PaymentMethod = "WeChat",
        QrCodeImage = "https://img.test/qr.jpg"
    };

    /// <summary>
    /// 属性：提现金额低于 1 元时应被拒绝
    /// </summary>
    [Property(MaxTest = 20)]
    public bool 提现金额低于1元时被拒绝(PositiveInt seed)
    {
        // 生成 0.01 ~ 0.99 之间的金额
        var amount = Math.Round((seed.Get % 99 + 1) * 0.01m, 2);
        if (amount >= 1.0m) return true;

        var dbName = $"wd_low_{Guid.NewGuid()}";
        using var factory = CreateFactory(dbName);
        var userId = 100;
        var suffix = Guid.NewGuid().ToString("N");
        SeedAvailableEarnings(factory, userId, 100m, suffix);

        var client = factory.CreateClient();
        client.DefaultRequestHeaders.Authorization =
            new AuthenticationHeaderValue("Bearer", GenerateToken(userId, "Runner"));

        var resp = client.PostAsJsonAsync("/api/earnings/withdraw", MakeWithdrawRequest(amount)).Result;
        return resp.StatusCode == HttpStatusCode.BadRequest;
    }

    /// <summary>
    /// 属性：提现金额超出可提现余额时应被拒绝
    /// </summary>
    [Property(MaxTest = 20)]
    public bool 提现金额超出余额时被拒绝(PositiveInt seed)
    {
        var availableAmount = 50.0m;
        // 生成超出余额的金额
        var amount = availableAmount + Math.Round((seed.Get % 100 + 1) * 1.0m, 2);

        var dbName = $"wd_over_{Guid.NewGuid()}";
        using var factory = CreateFactory(dbName);
        var userId = 100;
        var suffix = Guid.NewGuid().ToString("N");
        SeedAvailableEarnings(factory, userId, availableAmount, suffix);

        var client = factory.CreateClient();
        client.DefaultRequestHeaders.Authorization =
            new AuthenticationHeaderValue("Bearer", GenerateToken(userId, "Runner"));

        var resp = client.PostAsJsonAsync("/api/earnings/withdraw", MakeWithdrawRequest(amount)).Result;
        return resp.StatusCode == HttpStatusCode.BadRequest;
    }

    /// <summary>
    /// 属性：合法提现金额（>=1, <=余额, 小数位<=2）应成功
    /// </summary>
    [Property(MaxTest = 20)]
    public bool 合法提现金额时申请成功(PositiveInt seed)
    {
        var availableAmount = 100.0m;
        // 生成 1.00 ~ 100.00 之间的合法金额（2 位小数）
        var amount = Math.Round(1.0m + (seed.Get % 9900) * 0.01m, 2);
        if (amount > availableAmount) amount = availableAmount;

        var dbName = $"wd_ok_{Guid.NewGuid()}";
        using var factory = CreateFactory(dbName);
        var userId = 100;
        var suffix = Guid.NewGuid().ToString("N");
        SeedAvailableEarnings(factory, userId, availableAmount, suffix);

        var client = factory.CreateClient();
        client.DefaultRequestHeaders.Authorization =
            new AuthenticationHeaderValue("Bearer", GenerateToken(userId, "Runner"));

        var resp = client.PostAsJsonAsync("/api/earnings/withdraw", MakeWithdrawRequest(amount)).Result;
        return resp.StatusCode == HttpStatusCode.Created;
    }

    /// <summary>
    /// 属性：提现金额小数位超过 2 位时应被拒绝
    /// </summary>
    [Property(MaxTest = 20)]
    public bool 提现金额小数位超过2位时被拒绝(PositiveInt seed)
    {
        // 生成 3 位小数的金额，如 1.123
        var amount = 1.0m + (seed.Get % 900) * 0.001m;
        if (amount == Math.Round(amount, 2)) amount += 0.001m;

        var dbName = $"wd_dec_{Guid.NewGuid()}";
        using var factory = CreateFactory(dbName);
        var userId = 100;
        var suffix = Guid.NewGuid().ToString("N");
        SeedAvailableEarnings(factory, userId, 100m, suffix);

        var client = factory.CreateClient();
        client.DefaultRequestHeaders.Authorization =
            new AuthenticationHeaderValue("Bearer", GenerateToken(userId, "Runner"));

        var resp = client.PostAsJsonAsync("/api/earnings/withdraw", MakeWithdrawRequest(amount)).Result;
        return resp.StatusCode == HttpStatusCode.BadRequest;
    }

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