// See https://aka.ms/new-console-template for more information

using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading;

internal class Program
{
    private static void Main(string[] args)
    {
        Process.GetCurrentProcess().PriorityClass = ProcessPriorityClass.AboveNormal;


        var counter = new PerformanceCounter("System", "Processor Queue Length", null);

        Console.WriteLine(counter.NextValue());




        //ShowCpuLoadByKernelIdleTime();
    }

    private static void ShowCpuLoadByKernelIdleTime()
    {
        var a = GetIdleKernelTime();
        if (a.HasValue == false)
        {
            Console.WriteLine("ERROR A");
            return;
        }
        Thread.Sleep(1000);
        var b = GetIdleKernelTime();
        if (b.HasValue == false)
        {
            Console.WriteLine("ERROR B");
            return;
        }

        var d = (b.Value - a.Value);
        var p = d / Environment.ProcessorCount;

        var i = d / 1000000000.0;

        Console.WriteLine($"{i * 100:N2}");
    }

    private static long? GetIdleKernelTime()
    {
        var outputs = RunCmd("wmic", "Process", "where", "ProcessId=0", "get", "KernelModeTime", "/value");
        var kv = outputs.FirstOrDefault(s => string.IsNullOrEmpty(s) == false);

        if (kv != null)
        {
            var kvs = kv.Split('=', 2);
            if (kvs.Length == 2 && long.TryParse(kvs[1], out var ns100)) return ns100;
        }

        return null;
    }

    private static IReadOnlyList<string> RunCmd(string filename, params string[] args)
    {
        var outputs = new List<string>();

        var p = new Process();
        p.StartInfo.FileName = filename;
        foreach (var s in args) p.StartInfo.ArgumentList.Add(s);
        p.StartInfo.RedirectStandardOutput = true;
        p.StartInfo.UseShellExecute = false;

        p.OutputDataReceived += (sender, eventArgs) => outputs.Add(eventArgs.Data);

        p.Start();
        p.BeginOutputReadLine();
        p.WaitForExit();

        return outputs;
    }
}