using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Diagnostics;
using System.Threading;


namespace zadaniePW
{
    public partial class Form1 : Form
    {
        int i = 1;
        static int silnia = 0;
        static int suma = 0;
        long CzasDoKonca = 0;

        Stopwatch czas = new Stopwatch();
      
        static Thread watek;

        private static int silnia1(int i)
        {
            if (i < 1)
                return 1;
            else
                return i * silnia1(i - 1);
        }

        public void dodawanie()
        {
            while (true)
            {

            MethodInvoker m = new MethodInvoker(() => progressBar1.Value = suma);
            progressBar1.Invoke(m);

            suma++;

            if (silnia == suma)
                {
                    watek.Join();
                    break;
                }                
            }
        }



        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {

            

            czas.Start();
            silnia = silnia1(Convert.ToInt16(textBox1.Text));
            label7.Text=Convert.ToString(silnia);
            progressBar1.Maximum=silnia;
            progressBar1.Minimum=0;

            

            for(i=1; i<silnia+1; i++){
                progressBar1.Value = i;


                if (i % 25 == 0)
                {
                    CzasDoKonca = ((silnia - i) * Convert.ToInt64(czas.ElapsedMilliseconds) / i);
                    label6.Text = Convert.ToString(CzasDoKonca/1000) + " s";
                    label5.Text = Convert.ToString(czas.ElapsedMilliseconds / 1000) + " s";
                    label5.Refresh();
                    label6.Refresh();
                    
                }

                
            }

            czas.Stop();
            label5.Text = Convert.ToString(czas.ElapsedMilliseconds/1000) + " s";

        }

        private void button4_Click(object sender, EventArgs e)
        {
            silnia = silnia1(Convert.ToInt16(textBox1.Text));
            label7.Text = Convert.ToString(silnia);
            progressBar1.Maximum = silnia;
            progressBar1.Minimum = 0;

            watek = new Thread(new ThreadStart(dodawanie));
            watek.Start();
        }
    }
}