using System;
using StellaOps.Policy.Engine.ConsoleSurface;
using StellaOps.Policy.Engine.Simulation;
using Xunit;

namespace StellaOps.Policy.Engine.Tests.ConsoleSurface;

public sealed class ConsoleSimulationDiffServiceTests
{
    [Fact]
    public void Compute_IsDeterministic_AndCarriesMetadata()
    {
        var analytics = new SimulationAnalyticsService();
        var service = new ConsoleSimulationDiffService(analytics);

        var request = new ConsoleSimulationDiffRequest(
            BaselinePolicyVersion: "2025.11.24",
            CandidatePolicyVersion: "2025.12.02",
            ArtifactScope: new[]
            {
                new ConsoleArtifactScope("sha256:abc", "pkg:npm/foo@1.0.0"),
                new ConsoleArtifactScope("sha256:def", "pkg:npm/bar@2.0.0")
            },
            Filters: new ConsoleSimulationFilters(new[] { "high", "critical" }, new[] { "RULE-1234" }),
            Budget: new ConsoleSimulationBudget(10, 5),
            EvaluationTimestamp: new DateTimeOffset(2025, 12, 2, 0, 0, 0, TimeSpan.Zero));

        var first = service.Compute(request);
        var second = service.Compute(request);

        Assert.Equal(first, second); // deterministic
        Assert.Equal("console-policy-23-001", first.SchemaVersion);
        Assert.True(first.Summary.After.Total > 0);
        Assert.True(first.Summary.Before.Total > 0);
        Assert.NotEmpty(first.RuleImpact);
        Assert.True(first.Samples.Findings.Length <= 10);
        Assert.Equal(request.EvaluationTimestamp, first.Provenance.EvaluationTimestamp);
    }
}