using System.Net;
using System.Net.Http;
using Azaion.E2E.Helpers;
using FluentAssertions;
using Xunit;

namespace Azaion.E2E.Tests;

// AZ-538 — CORS http-origin removal + HSTS + HTTPS redirection.
//
// The test environment runs ASPNETCORE_ENVIRONMENT=Development (matches the
// docker-compose.test.yml setting), so AC-3/AC-4 (production-only behavior) are
// verified by direct inspection of the production-side code path:
// `if (!app.Environment.IsDevelopment()) { app.UseHsts(); app.UseHttpsRedirection(); }`
// — the same gate ASP.NET Core's standard project template uses.
//
// AC-1, AC-2, and AC-5 are exercised here against the running container.
[Collection("E2E")]
public sealed class CorsHttpsTests
{
    private readonly TestFixture _fixture;

    public CorsHttpsTests(TestFixture fixture) => _fixture = fixture;

    [Fact]
    public async Task AC1_Http_origin_is_rejected_by_cors_preflight()
    {
        // Arrange
        using var bare = new HttpClient { BaseAddress = new Uri(_fixture.Settings.ApiBaseUrl), Timeout = TimeSpan.FromSeconds(30) };
        var preflight = new HttpRequestMessage(HttpMethod.Options, "/login");
        preflight.Headers.Add("Origin", "http://admin.azaion.com");
        preflight.Headers.Add("Access-Control-Request-Method", "POST");
        preflight.Headers.Add("Access-Control-Request-Headers", "content-type");

        // Act
        using var response = await bare.SendAsync(preflight);

        // Assert
        response.Headers.Contains("Access-Control-Allow-Origin").Should().BeFalse(
            "the http origin is no longer allow-listed");
    }

    [Fact]
    public async Task AC2_Https_origin_is_accepted_with_credentials()
    {
        // Arrange
        using var bare = new HttpClient { BaseAddress = new Uri(_fixture.Settings.ApiBaseUrl), Timeout = TimeSpan.FromSeconds(30) };
        var preflight = new HttpRequestMessage(HttpMethod.Options, "/login");
        preflight.Headers.Add("Origin", "https://admin.azaion.com");
        preflight.Headers.Add("Access-Control-Request-Method", "POST");
        preflight.Headers.Add("Access-Control-Request-Headers", "content-type");

        // Act
        using var response = await bare.SendAsync(preflight);

        // Assert
        response.Headers.GetValues("Access-Control-Allow-Origin")
            .Should().ContainSingle().Which.Should().Be("https://admin.azaion.com");
        response.Headers.GetValues("Access-Control-Allow-Credentials")
            .Should().ContainSingle().Which.Should().Be("true");
    }

    // AZ-538 AC-3 — HSTS is gated to non-Development envs in Program.cs:
    //   if (!app.Environment.IsDevelopment()) { app.UseHsts(); ... }
    // The test container runs ASPNETCORE_ENVIRONMENT=Development, so the production
    // path can't be exercised here without spinning a second Production-mode SUT.
    // Tracked here as a skipped Fact so the AC stays linked to a test rather than a
    // file-level comment; promote to a runnable test when a prod-mode harness exists.
    [Fact(Skip = "AZ-538 AC-3 requires ASPNETCORE_ENVIRONMENT=Production; test harness runs Development. Verified by code inspection of Program.cs UseHsts gate.")]
    public void AC3_Hsts_header_present_in_production() { }

    // AZ-538 AC-4 — same gate as AC-3: UseHttpsRedirection only fires when not
    // Development. Skipped for the same prod-only reason.
    [Fact(Skip = "AZ-538 AC-4 requires ASPNETCORE_ENVIRONMENT=Production; test harness runs Development. Verified by code inspection of Program.cs UseHttpsRedirection gate.")]
    public void AC4_Http_request_redirects_to_https_in_production() { }

    [Fact]
    public async Task AC5_Development_env_does_not_redirect_or_send_hsts()
    {
        // Arrange
        using var bare = new HttpClient { BaseAddress = new Uri(_fixture.Settings.ApiBaseUrl), Timeout = TimeSpan.FromSeconds(30) };

        // Act
        using var response = await bare.GetAsync("/health/live");

        // Assert
        response.StatusCode.Should().Be(HttpStatusCode.OK);
        response.Headers.Contains("Strict-Transport-Security").Should().BeFalse(
            "Development env must not emit HSTS so http://localhost workflows still work");
    }
}