// <copyright file="Spdx3ParserBenchmarks.cs" company="StellaOps">
// Copyright (c) StellaOps. Licensed under the BUSL-1.1.
// </copyright>
using Microsoft.Extensions.Caching.Memory;
using Microsoft.Extensions.Logging.Abstractions;
using Microsoft.Extensions.Options;
using Moq;
using StellaOps.Spdx3.JsonLd;
using StellaOps.Spdx3.Tests.TestInfrastructure;

namespace StellaOps.Spdx3.Tests;

/// <summary>
/// Performance benchmarks for SPDX 3.0.1 parser.
/// Task: SP3-018 - Validate parsing performance for various document sizes.
/// </summary>
/// <remarks>
/// These tests measure parsing performance and compare against 2.x parser baseline.
/// Target: SPDX 3.0.1 parser should be within 2x of 2.x parser performance.
/// </remarks>
[Trait("Category", "Performance")]
[Trait("Intent", "Performance")]
public sealed partial class Spdx3ParserBenchmarks : IDisposable
{
    private const int WarmupIterations = 3;
    private const int BenchmarkIterations = 10;
    private static readonly string TempDirRoot = Path.Combine(Path.GetTempPath(), "stellaops-tests", "spdx3-benchmarks");

    private readonly Spdx3Parser _parser;
    private readonly MemoryCache _cache;
    private readonly string _tempDir;

    public Spdx3ParserBenchmarks()
    {
        _cache = new MemoryCache(new MemoryCacheOptions { SizeLimit = 1000 });
        var httpClientFactory = new Mock<IHttpClientFactory>();
        var options = Options.Create(new Spdx3ContextResolverOptions { AllowRemoteContexts = false });
        var resolver = new Spdx3ContextResolver(
            httpClientFactory.Object,
            _cache,
            NullLogger<Spdx3ContextResolver>.Instance,
            options,
            TimeProvider.System);

        _parser = new Spdx3Parser(resolver, NullLogger<Spdx3Parser>.Instance);
        _tempDir = TempDirRoot;
        ResetTempDir();
    }

    public void Dispose()
    {
        _cache.Dispose();
        TryDeleteTempDir();
    }

    private string CreateDocument(int packageCount) => Spdx3BenchmarkDocumentBuilder.WriteDocument(_tempDir, packageCount);

    private void ResetTempDir()
    {
        TryDeleteTempDir();
        Directory.CreateDirectory(_tempDir);
    }

    private void TryDeleteTempDir()
    {
        try
        {
            if (Directory.Exists(_tempDir))
            {
                Directory.Delete(_tempDir, recursive: true);
            }
        }
        catch
        {
            // Best effort cleanup.
        }
    }
}