using System.Net;
using System.Net.Http.Json;
using FluentAssertions;
using Microsoft.AspNetCore.Mvc.Testing;
using StellaOps.SbomService.Models;
using Xunit;

using StellaOps.TestKit;
namespace StellaOps.SbomService.Tests;

public class ResolverFeedExportTests : IClassFixture<WebApplicationFactory<Program>>
{
    private readonly WebApplicationFactory<Program> _factory;

    public ResolverFeedExportTests(WebApplicationFactory<Program> factory)
    {
        _factory = factory;
    }

    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task Export_returns_ndjson_in_deterministic_order()
    {
        var client = _factory.CreateClient();

        // ensure feed populated
        await client.PostAsync("/internal/sbom/resolver-feed/backfill", null);

        var response = await client.GetAsync("/internal/sbom/resolver-feed/export");
        response.StatusCode.Should().Be(HttpStatusCode.OK);
        response.Content.Headers.ContentType!.MediaType.Should().Be("application/x-ndjson");

        var body = await response.Content.ReadAsStringAsync();
        var lines = body.Split('\n', StringSplitOptions.RemoveEmptyEntries);
        lines.Length.Should().BeGreaterThan(0);

        // verify deterministic ordering by first and last line comparison
        var first = lines.First();
        var last = lines.Last();
        first.Should().BeLessOrEqualTo(last, Comparer<string>.Create(StringComparer.Ordinal.Compare));

        // spot-check a known candidate
        var candidates = await client.GetFromJsonAsync<List<ResolverCandidate>>("/internal/sbom/resolver-feed");
        candidates.Should().NotBeNull();
        candidates!.Any(c => c.Purl == "pkg:npm/lodash@4.17.21").Should().BeTrue();
    }
}