using StellaOps.Bench.ScannerAnalyzers;
using StellaOps.Bench.ScannerAnalyzers.Baseline;
using StellaOps.Bench.ScannerAnalyzers.Reporting;
using Xunit;

namespace StellaOps.Bench.ScannerAnalyzers.Tests;

public sealed class PrometheusWriterTests
{
    [Fact]
    public void Write_EmitsMetricsForScenario()
    {
        var result = new ScenarioResult(
            "scenario_a",
            "Scenario A",
            SampleCount: 5,
            MeanMs: 10,
            P95Ms: 12,
            MaxMs: 20,
            Iterations: 5,
            ThresholdMs: 5000);
        var baseline = new BaselineEntry("scenario_a", 5, 5, 9, 11, 18);
        var report = new BenchmarkScenarioReport(result, baseline, 1.2);

        var path = Path.Combine(Path.GetTempPath(), $"metrics-{Guid.NewGuid():N}.prom");
        PrometheusWriter.Write(path, new[] { report });

        var contents = File.ReadAllText(path);
        Assert.Contains("scanner_analyzer_bench_max_ms{scenario=\"scenario_a\"} 20", contents);
        Assert.Contains("scanner_analyzer_bench_regression_ratio{scenario=\"scenario_a\"}", contents);
    }
}