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.Collections;

namespace Szyfr_homofoniczny
{
    public partial class Form1 : Form
    {
        String wordToEncrypt;
        String encryptedWord;
        String wordToDecrypt;

        ArrayList alphabet = new ArrayList();
        ArrayList ASCII = new ArrayList();

        Char[,] homophones = new Char[26, 3];

        Random random = new Random(420);
        Random random2 = new Random();

        char randomASCII;
        char randomASCII2;

        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            wordToEncrypt = textBox1.Text;
            encryptedWord = "";
            alphabet.Clear();
            ASCII.Clear();
            textBox3.Clear();

            for (char letter='A'; letter<='Z'; letter++)
            {
                alphabet.Add(letter);
            }

            for (int code=33; code<127; code++)
            {
                ASCII.Add((char)(code));
            }

            for (int i=0; i<alphabet.Count; i++)
            {
                for (int j=0; j<3; j++)
                {
                    randomASCII = (char)random.Next(0, ASCII.Count);

                    homophones[i, j] = (char)ASCII[randomASCII];

                    ASCII.RemoveAt(randomASCII);
                }
            }

            for (int i=0; i<wordToEncrypt.Length; i++)
            {
                randomASCII2 = (char)random2.Next(0, 3);
                encryptedWord += homophones[alphabet.IndexOf((char)wordToEncrypt[i]), randomASCII2];
            }

            textBox2.Text = encryptedWord;
        }

        private void button2_Click(object sender, EventArgs e)
        {
            wordToDecrypt = textBox2.Text;
            textBox3.Clear();

            for (int i=0; i<wordToDecrypt.Length; i++)
            {
                for (int j=0; j<alphabet.Count; j++)
                {
                    for (int k=0; k<3; k++)
                    {
                        if ((char)wordToDecrypt[i] == (char)homophones[j, k])
                        {
                            textBox3.Text += alphabet[j];
                        }
                    }
                }
            }
        }
    }
}