using StellaOps.Bench.LinkNotMerge.Vex.Baseline;
using StellaOps.Bench.LinkNotMerge.Vex.Reporting;
using Xunit;

namespace StellaOps.Bench.LinkNotMerge.Vex.Tests;

public sealed class BenchmarkScenarioReportTests
{
    [Fact]
    public void RegressionDetection_FlagsBreaches()
    {
        var result = new VexScenarioResult(
            Id: "scenario",
            Label: "Scenario",
            Iterations: 3,
            ObservationCount: 1000,
            AliasGroups: 100,
            StatementCount: 6000,
            EventCount: 3200,
            TotalStatistics: new DurationStatistics(600, 700, 750),
            InsertStatistics: new DurationStatistics(320, 360, 380),
            CorrelationStatistics: new DurationStatistics(280, 320, 340),
            ObservationThroughputStatistics: new ThroughputStatistics(8000, 7000),
            EventThroughputStatistics: new ThroughputStatistics(3500, 3200),
            AllocationStatistics: new AllocationStatistics(180),
            ThresholdMs: null,
            MinObservationThroughputPerSecond: null,
            MinEventThroughputPerSecond: null,
            MaxAllocatedThresholdMb: null);

        var baseline = new BaselineEntry(
            ScenarioId: "scenario",
            Iterations: 3,
            Observations: 1000,
            Statements: 6000,
            Events: 3200,
            MeanTotalMs: 520,
            P95TotalMs: 560,
            MaxTotalMs: 580,
            MeanInsertMs: 250,
            MeanCorrelationMs: 260,
            MeanObservationThroughputPerSecond: 9000,
            MinObservationThroughputPerSecond: 8500,
            MeanEventThroughputPerSecond: 4200,
            MinEventThroughputPerSecond: 3800,
            MaxAllocatedMb: 140);

        var report = new BenchmarkScenarioReport(result, baseline, regressionLimit: 1.1);

        Assert.True(report.DurationRegressionBreached);
        Assert.True(report.ObservationThroughputRegressionBreached);
        Assert.True(report.EventThroughputRegressionBreached);
        Assert.Contains(report.BuildRegressionFailureMessages(), message => message.Contains("event throughput"));
    }

    [Fact]
    public void RegressionDetection_NoBaseline_NoBreaches()
    {
        var result = new VexScenarioResult(
            Id: "scenario",
            Label: "Scenario",
            Iterations: 3,
            ObservationCount: 1000,
            AliasGroups: 100,
            StatementCount: 6000,
            EventCount: 3200,
            TotalStatistics: new DurationStatistics(480, 520, 540),
            InsertStatistics: new DurationStatistics(260, 280, 300),
            CorrelationStatistics: new DurationStatistics(220, 240, 260),
            ObservationThroughputStatistics: new ThroughputStatistics(9000, 8800),
            EventThroughputStatistics: new ThroughputStatistics(4200, 4100),
            AllocationStatistics: new AllocationStatistics(150),
            ThresholdMs: null,
            MinObservationThroughputPerSecond: null,
            MinEventThroughputPerSecond: null,
            MaxAllocatedThresholdMb: null);

        var report = new BenchmarkScenarioReport(result, baseline: null, regressionLimit: null);

        Assert.False(report.RegressionBreached);
        Assert.Empty(report.BuildRegressionFailureMessages());
    }
}