using System.Text.RegularExpressions;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Jobs;
using BenchmarkDotNet.Running;

var summary = BenchmarkRunner.Run<MainTest>();

partial class Regexs
{
    [GeneratedRegex(@"(\w+)", RegexOptions.Singleline)]
    private static partial Regex R();

    public static int Matches(string s)
    {
        return R().Matches(s).Count;
    }

    public static int MatchesCount(string s)
    {
        return R().Count(s);
    }
}

//[SimpleJob(RuntimeMoniker.Net60)]
[SimpleJob(RuntimeMoniker.Net70, baseline: true)]
[WarmupCount(3)]
[IterationCount(3)]
[MemoryDiagnoser]
public class MainTest
{
    string smallFile = File.ReadAllText(@"D:\Downloads\infrastructure.yml");
    string s         = File.ReadAllText(@"D:\Downloads\_books\Afghanskii tiul'pan - Ivan Pankratov.fb2");

    static readonly Regex rx = new(@"(\w+)", RegexOptions.Singleline | RegexOptions.Compiled | RegexOptions.NonBacktracking);

    [Benchmark]
    public void Regex()
    {
        var count = System.Text.RegularExpressions.Regex.Matches(s, @"(\w+)", RegexOptions.Singleline).Count;
    }

    [Benchmark]
    public void RegexCount()
    {
        var count = System.Text.RegularExpressions.Regex.Count(s, @"(\w+)", RegexOptions.Singleline);
    }

    [Benchmark]
    public void RegexCompiled()
    {
        var count = rx.Matches(s).Count;
    }

    [Benchmark]
    public void RegexCompiledCount()
    {
        var count = rx.Count(s);
    }

    [Benchmark]
    public void RegexSourceGen()
    {
        var count = Regexs.Matches(s);
    }

    [Benchmark]
    public void RegexSourceGenCount()
    {
        var count = Regexs.MatchesCount(s);
    }

    [Benchmark]
    public void Split()
    {
        var count = s.Split(' ').Length;
    }

    [Benchmark]
    public void Count()
    {
        var count = s.Count(c => c == ' ') + 1;
    }

    [Benchmark]
    public void For()
    {
        var count = 1;
        for (var i = 0; i < s.Length; i++)
        {
            if (s[i] == ' ') count++;
        }
    }

    [Benchmark]
    public void ForEach()
    {
        var count = 1;
        foreach (var t in s)
            if (t == ' ')
                count++;
    }
}