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;
using System.Security.Cryptography;

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

        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();
        }

        private void button3_Click(object sender, EventArgs e)
        {
            SaveFileDialog sve = new SaveFileDialog();
            if (sve.ShowDialog() != DialogResult.OK)
            {
                txtOutput.Text += Environment.NewLine + "You stupid two pump chump, you fucked something up";
            }
        }

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


        private void EncryptData()
        {
            //THE KEY
            byte[] keyArray = new byte[512];

            rand.GetBytes(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();
            stringBuilder.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++)
            {
                fileBytes[i] ^= keyArray[keyIndexSize];
                keyIndexSize++;
                if (keyIndexSize > (keyArray.Length - 1))
                {
                    keyIndexSize = 0;
                }
            }
            stringBuilder.Append(Encoding.ASCII.GetString(fileBytes));//TODO: Handle larger files...
            OutputWriter();

        }

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




    }

}