using System.Text;
using StellaOps.Bench.ScannerAnalyzers.Baseline;
using Xunit;

namespace StellaOps.Bench.ScannerAnalyzers.Tests;

public sealed class BaselineLoaderTests
{
    [Fact]
    public async Task LoadAsync_ReadsCsvIntoDictionary()
    {
        var csv = """
            scenario,iterations,sample_count,mean_ms,p95_ms,max_ms
            node_monorepo_walk,5,4,9.4303,36.1354,45.0012
            python_site_packages_walk,5,10,12.1000,18.2000,26.3000
            """;

        var path = await WriteTempFileAsync(csv);

        var result = await BaselineLoader.LoadAsync(path, CancellationToken.None);

        Assert.Equal(2, result.Count);
        var entry = Assert.Contains("node_monorepo_walk", result);
        Assert.Equal(5, entry.Iterations);
        Assert.Equal(4, entry.SampleCount);
        Assert.Equal(9.4303, entry.MeanMs, 4);
        Assert.Equal(36.1354, entry.P95Ms, 4);
        Assert.Equal(45.0012, entry.MaxMs, 4);
    }

    private static async Task<string> WriteTempFileAsync(string content)
    {
        var path = Path.Combine(Path.GetTempPath(), $"baseline-{Guid.NewGuid():N}.csv");
        await File.WriteAllTextAsync(path, content, Encoding.UTF8);
        return path;
    }
}