using BenchmarkDotNet.Attributes;
using System.Runtime.CompilerServices;

namespace Benchmarks.Console.Misc;

[MemoryDiagnoser]
public class AsyncVsReturnTask
{
    [Benchmark]
    public async Task Await_CompletedTask()
    {
        await Task.CompletedTask;
    }

    [Benchmark]
    public Task Return_CompletedTask()
    {
        return Task.CompletedTask;
    }

    [Benchmark]
    [Arguments(0)]
    [Arguments(5)]
    [Arguments(10)]
    [Arguments(100)]
    public async Task<int> Await_Iterations(int iterations)
    {
        return await CreateDummyTask(iterations);
    }

    [Benchmark]
    [Arguments(0)]
    [Arguments(5)]
    [Arguments(10)]
    [Arguments(100)]
    public Task<int> Return_Iterations(int iterations)
    {
        return CreateDummyTask(iterations);
    }

    [MethodImpl(MethodImplOptions.AggressiveInlining)]
    private Task<int> CreateDummyTask(int iterations)
    {
        return Task.Run(() =>
        {
            int dummy = 0;

            for (var i = 0; i < iterations; ++i) ++dummy;

            return dummy;
        });
    }
}