using AyCode.Core.Tests.TestModels;
using MemoryPack;
using System.Runtime.CompilerServices;

namespace AyCode.Core.Serializers.Console.Benchmarks;

/// <summary>
/// MemoryPack benchmark, Byte[] I/O mode. The SOTA baseline AcBinary is compared against in every
/// cell. WireMode-aligned options via <see cref="BenchmarkOptions.GetMemPack"/> so Compact ↔ UTF-8
/// and FastWire ↔ UTF-16 are apples-to-apples on the string-encoding axis.
/// </summary>
internal sealed class MemoryPackBenchmark<T> : ISerializerBenchmark where T : class
{
    private readonly T _order;
    private readonly MemoryPackSerializerOptions _options;
    private readonly byte[] _serialized;

    public BenchmarkEngine Engine => BenchmarkEngine.MemoryPack;
    public BenchmarkIoMode IoMode => BenchmarkIoMode.ByteArray;
    public BenchmarkDispatchMode DispatchMode => BenchmarkDispatchMode.SGen; // MemoryPack always uses [MemoryPackable] source-generated formatters
    public Type OrderType => typeof(T);
    public string OptionsPreset { get; }
    public int SerializedSize => _serialized.Length;
    public long SetupSerializeAllocBytes => 0;
    public long SetupDeserializeAllocBytes => 0;
    public string? OptionsDescription => $"StringEncoding={_options.StringEncoding}";

    public MemoryPackBenchmark(T order, string optionsPreset)
    {
        _order = order;
        OptionsPreset = optionsPreset;
        _options = BenchmarkOptions.GetMemPack();
        _serialized = MemoryPackSerializer.Serialize(order, _options);
    }

    [MethodImpl(MethodImplOptions.NoInlining)]
    public void Serialize() => MemoryPackSerializer.Serialize(_order, _options);

    [MethodImpl(MethodImplOptions.NoInlining)]
    public void Deserialize() => MemoryPackSerializer.Deserialize<T>(_serialized, _options);

    public bool VerifyRoundTrip()
    {
        var bytes = MemoryPackSerializer.Serialize(_order, _options);
        var roundTripped = MemoryPackSerializer.Deserialize<T>(bytes, _options);
        return BenchmarkLoop.DeepEqualsViaJson(_order, roundTripped);
    }
}