/*
 * Created by SharpDevelop.
 * User: Rza
 * Date: 24-May-15
 * Time: 8:56 PM
 *
 * To change this template use Tools | Options | Coding | Edit Standard Headers.
 */
using System;
using System.Threading;


namespace supermarket
{
	/// <summary>
	/// Description of Supermarket.
	/// </summary>
	class Supermarket
	{

		private SemaphoreSlim semaforKase1 = new SemaphoreSlim(1);
		private SemaphoreSlim semaforKase2 = new SemaphoreSlim(1);

		private int red1;
		private int red2;

		private object objekat;

		private int vremeNaKasi;

		public Supermarket(int vremeNaKasi)
		{
			this.vremeNaKasi = vremeNaKasi;
			objekat = new object();
			red1 = 0;
			red2 = 0;
		}
		public void dolazakNaKasu()
		{
			string trenutniKupac = Thread.CurrentThread.Name;
			Console.WriteLine("{0}. kupac zeli da stane u red.", trenutniKupac);
			bool uRedu1 = false;
			bool uRedu2 = false;

			lock (objekat)
			{
				if (red1 > red2)
				{
					uRedu1 = true;
				}
				else
				{
					uRedu2 = true;
				}
				if (uRedu1 == true)
				{
					lock (objekat)
					{
						red1++;
						Console.WriteLine("{0} kupac je usao u prvi red.", trenutniKupac);
						uRedu1 = false;
					}
					semaforKase1.Wait();
					lock (objekat)
					{
						Console.WriteLine("{0} se nalazi na kasi 1", trenutniKupac);
						red1 --;
					}
					Thread.Sleep(vremeNaKasi);
					Console.WriteLine("{0} odlazi iz supermarketa", trenutniKupac);
					lock (objekat)
					{
						semaforKase1.Release();
					}
				}

				if (uRedu2 == true)
				{
					lock (objekat)
					{
						red2++;
						Console.WriteLine("{0} kupac je usao u drugi red", trenutniKupac);
						uRedu2 = false;
					}
					semaforKase2.Wait();
					lock(objekat)
					{
						Console.WriteLine("{0} se nalazi na kasi 2", trenutniKupac);
						red2 --;
					}
					Thread.Sleep(vremeNaKasi);
					Console.WriteLine("{0} odlazi iz supermarketa", trenutniKupac);
					lock(objekat)
					{
						semaforKase2.Release();
					}
				}


			}
		}

	}
}