using System;
using System.Collections.Generic;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.IO;
using System.Linq;
using System.Threading;

namespace QuickEncryptTHIS
{
    public partial class Form1 : Form
    {
        //Class wide shit
        public StringBuilder stringBuilder = new StringBuilder();
        string transfer = string.Empty;

        public Form1()
        {
            InitializeComponent();
        }

        //THE BUTTONS
        private void button1_Click(object sender, EventArgs e)
        {
            EncryptData();
        }

        private void button2_Click(object sender, EventArgs e)
        {
            ExitProgram();
        }

        private void exitFileToolStripMenuItem_Click(object sender, EventArgs e)
        {
            ExitProgram();
        }

        void ExitProgram()
        {
            Application.Exit();
        }


        void EncryptData()
        {
            //THE KEY
            byte[] keyArray = new byte[3];

            new Random().NextBytes(keyArray); //used to fill an array with a random bytes, until the array is completely full
            int keyIndexSize = 0; //Counter for overflow prevention
            txtOutput.Clear();

            //FILE ACCESS
            OpenFileDialog opn = new OpenFileDialog();

            if (opn.ShowDialog() != DialogResult.OK)
            {
                return;
            }
            else
            {
                txtOutput.Text = "Encryption Started...";
            }
            byte[] fileBytes = File.ReadAllBytes(opn.FileName);//used for getting the file's bytes
            opn.FileName = null;


            //THE ENCRYPTION
            for (int i = 0; i < fileBytes.Length; i++)
            {
                byte enc = fileBytes[i];
                enc ^= keyArray[keyIndexSize];
                keyIndexSize++;
                if (keyIndexSize > (keyArray.Length - 1))
                {
                    keyIndexSize = 0;
                }
                stringBuilder.Append((char)enc);
            }
            OutputWriter();

        }

        public void OutputWriter()
        {
            txtOutput.Text += "\r\n" + "Encryption Completed";
            txtOutput.Text += "\r\n" + "Your encrypted Output" + "\r\n" + stringBuilder.ToString();
        }


    }

}