using System.Net;
using System.Text.RegularExpressions;
using Microsoft.AspNetCore.Mvc.Testing;

namespace CartWise.Web.Tests;

public class HouseholdAccessControlTests : IClassFixture<CartWiseWebApplicationFactory>
{
    private readonly CartWiseWebApplicationFactory _factory;

    public HouseholdAccessControlTests(CartWiseWebApplicationFactory factory)
    {
        _factory = factory;
    }

    [Fact]
    public async Task AnonymousUser_IsRedirectedToLoginWhenRequestingHousehold()
    {
        var client = _factory.CreateClient(new WebApplicationFactoryClientOptions { AllowAutoRedirect = false });

        var response = await client.GetAsync("/household");

        Assert.Equal(HttpStatusCode.Redirect, response.StatusCode);
        Assert.Contains("/Account/Login", response.Headers.Location?.ToString());
    }

    [Fact]
    public async Task EachUser_OnlySeesTheirOwnHousehold()
    {
        var clientA = _factory.CreateClient();
        var clientB = _factory.CreateClient();

        await RegisterAsync(clientA, "alice2@example.com", "Alice");
        await RegisterAsync(clientB, "bob2@example.com", "Bob");

        await CreateHouseholdAsync(clientA, "Alice's Household");
        await CreateHouseholdAsync(clientB, "Bob's Household");

        var householdPageA = await clientA.GetStringAsync("/household");
        var householdPageB = await clientB.GetStringAsync("/household");

        HtmlAssert.Contains("Alice's Household", householdPageA);
        HtmlAssert.DoesNotContain("Bob's Household", householdPageA);

        HtmlAssert.Contains("Bob's Household", householdPageB);
        HtmlAssert.DoesNotContain("Alice's Household", householdPageB);
    }

    private static async Task RegisterAsync(HttpClient client, string email, string displayName)
    {
        var html = await client.GetStringAsync("/Account/Register");
        var token = ExtractAntiForgeryToken(html);

        var form = new Dictionary<string, string>
        {
            ["__RequestVerificationToken"] = token,
            ["DisplayName"] = displayName,
            ["Email"] = email,
            ["Password"] = "Sup3rSecret!23",
            ["ConfirmPassword"] = "Sup3rSecret!23"
        };

        var response = await client.PostAsync("/Account/Register", new FormUrlEncodedContent(form));
        response.EnsureSuccessStatusCode();
    }

    private static async Task CreateHouseholdAsync(HttpClient client, string name)
    {
        var html = await client.GetStringAsync("/household/create");
        var token = ExtractAntiForgeryToken(html);

        var form = new Dictionary<string, string>
        {
            ["__RequestVerificationToken"] = token,
            ["Name"] = name
        };

        var response = await client.PostAsync("/household/create", new FormUrlEncodedContent(form));
        response.EnsureSuccessStatusCode();
    }

    private static string ExtractAntiForgeryToken(string html)
    {
        var match = Regex.Match(html, "name=\"__RequestVerificationToken\"[^>]*value=\"([^\"]+)\"");
        return match.Success ? match.Groups[1].Value : throw new InvalidOperationException("Anti-forgery token not found.");
    }
}