using Xunit;
using System.Threading.Tasks;
using StellaOps.Policy.Engine.Overlay;
using StellaOps.Policy.Engine.Services;
using StellaOps.Policy.Engine.Streaming;

using StellaOps.TestKit;
namespace StellaOps.Policy.Engine.Tests;

public sealed class OverlayProjectionServiceTests
{
    [Trait("Category", TestCategories.Unit)]
        [Fact]
    public async Task BuildSnapshotAsync_ProducesHeaderAndSortedProjections()
    {
        var service = new OverlayProjectionService(new PolicyEvaluationService(), TimeProvider.System);

        var request = new PathScopeSimulationRequest(
            SchemaVersion: "1.0.0",
            Tenant: "acme",
            BasePolicyRef: "policy://acme/main@sha256:1",
            CandidatePolicyRef: "policy://acme/feat@sha256:2",
            Subject: new PathScopeSubject("pkg:npm/lodash@4.17.21", null, "lib.js", null),
            Targets: new[]
            {
                new PathScopeTarget("b/file.js", "b/", "prefix", 0.5, null, null, null, "e2", null, null),
                new PathScopeTarget("a/file.js", "a/", "prefix", 0.9, null, null, null, "e1", null, null)
            },
            Options: new SimulationOptions("path,finding,verdict", 100, IncludeTrace: true, Deterministic: true));

        var lines = await service.BuildSnapshotAsync(request);

        Assert.Equal(3, lines.Count); // header + 2 projections
        Assert.Contains("overlay-projection-v1", lines[0]);
        Assert.Contains("\"filePath\":\"a/file.js\"", lines[1]);
        Assert.Contains("\"filePath\":\"b/file.js\"", lines[2]);
    }
}