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

namespace ConsoleApp39
{
    class Program
    {
        static SemaphoreSlim semafor1 = new SemaphoreSlim(1);
        static SemaphoreSlim semafor = new SemaphoreSlim(10);
        static SemaphoreSlim semafor2 = new SemaphoreSlim(1);
        static SemaphoreSlim semafor3 = new SemaphoreSlim(1);

        static int red1 = 0, red2 = 0, red3 = 0;
        static int brojLjudi = 0;
        static readonly object locker = new object();

        static void Dolazak()
        {
            semafor.Wait();
            Console.WriteLine(brojLjudi + " . Klijent dolazi u postu.");
            Thread.Sleep(1000);
            int najmanjired = minimum();
            if (najmanjired == 1)
            {
                Salter1();
            }
            else if (najmanjired == 2)
            {
                Salter2();
            }
            else
            {
                Salter3();
            }
            semafor.Release();
        }

        static void Salter1()
        {
            lock(locker)
            {
                red1++;

            }
            semafor1.Wait();
            Console.WriteLine("SALTER 1.... Korisnik vrsi uplatu...");
            Thread.Sleep(200);
            Console.WriteLine("ZAVRSIO. IZLAZI IZ POSTE");

            semafor1.Release();
            lock(locker)
            {
                red1--;

            }
        }

        static void Salter2()
        {
            lock(locker)
            {
                red2++;

            }
            semafor2.Wait();
            Console.WriteLine("SALTER 2.... Korisnik vrsi uplatu...");
            Thread.Sleep(200);
            Console.WriteLine("ZAVRSIO. IZLAZI IZ POSTE");
            semafor2.Release();
            lock(locker)
            {
            red2--;
            }

        }

        static void Salter3()
        {
            lock(locker)
            {
                red3++;

            }
            semafor3.Wait();
            Console.WriteLine("SALTER 3... Korisnik vrsi uplatu....");
            Thread.Sleep(200);
            semafor3.Release();
            lock (locker)
            {
                red3--;

            }
        }
        static int minimum()
        {
            if(red1< red2 && red1<red3)
            {
                return 1;
            }
            else if (red2 < red1 && red2 < red3)
            {
                return 2;
            }
            else if (red1==red2 && red1==red3 && red2==red3)
            {
                Random r = new Random();
                return (r.Next(1, 3));
            }
            else
            {
                return 3;
            }
        }

        static void Main(string[] args)
        {

            while(true)
            {
                Thread posta = new Thread(() => Dolazak());
                posta.Start();
                Thread.Sleep(100);
                brojLjudi++;
            }
            Console.ReadLine();
        }
    }
}