using System.Runtime.InteropServices;

namespace ProjectQuint.Probes;

public sealed record CoreBenchmarkReport(int SchemaVersion, bool Complete, DateTimeOffset MeasuredAtUtc,
    string Runtime, string OperatingSystem, string Architecture, int ProcessorCount,
    int Notes, int Events, uint Seed, int FrameRate, int WarmupIterations, int RequestedIterations,
    ReplayObservation[] Samples);

public static class CoreBenchmark
{
    public static CoreBenchmarkReport Run(int notes, uint seed, int frameRate, int iterations,
        Action<CoreBenchmarkReport> checkpoint)
    {
        if (iterations < 1 || iterations > 100)
            throw new ArgumentOutOfRangeException(nameof(iterations), "Use 1 to 100 iterations.");
        var workload = SyntheticWorkload.Create(notes, seed);
        const int warmups = 3;
        JudgementSnapshot expected = default;
        for (var index = 0; index < warmups; index++)
            expected = ReplayRunner.Run(workload, frameRate).Judgement;
        var samples = new List<ReplayObservation>(iterations);
        var measuredAt = DateTimeOffset.UtcNow;
        for (var index = 0; index < iterations; index++)
        {
            var sample = ReplayRunner.Run(workload, frameRate);
            if (sample.Judgement != expected || !sample.Judgement.Finished)
                throw new InvalidOperationException("The benchmark replay diverged from its warmup result.");
            samples.Add(sample);
            checkpoint(Report(false));
        }
        return Report(true);

        CoreBenchmarkReport Report(bool complete) => new(1, complete, measuredAt,
            RuntimeInformation.FrameworkDescription,
            System.OperatingSystem.IsMacOS() ? "macOS" :
                System.OperatingSystem.IsLinux() ? "Linux" :
                System.OperatingSystem.IsWindows() ? "Windows" : "Other",
            RuntimeInformation.ProcessArchitecture.ToString(), Environment.ProcessorCount,
            notes, workload.Events.Length, seed, frameRate, warmups, iterations, samples.ToArray());
    }
}