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

namespace LabyGen1
{
    public partial class Form1 : Form
    {
        Graphics g;
        bool[,] laby = new bool[100, 100];
        Bitmap b = new Bitmap(600, 600);

        public Form1()
        {
            InitializeComponent();
            g = panel1.CreateGraphics();
        }

        private void DrawSetka()
        {
            for (int x = 0; x < 600; x ++)
            {
                for (int y = 0; y < 600; y++)
                {
                    if((x + 1) % 6 == 0 )
                        b.SetPixel(x, y, Color.Gray);
                    if ((y + 1) % 6 == 0)
                        b.SetPixel(x, y, Color.Gray);
                }
            }
        }

        private void PKletka(int ix, int iy)
        {
            int tx = ix * 6;
            int ty = iy * 6;

            for (int x = tx; x < (tx + 5); x++)
            {
                for (int y = ty; y < (ty + 5); y++)
                {
                    b.SetPixel(x, y, Color.Red);
                }
            }
        }

        private void ViewResult()
        {
            for (int x = 1; x < 99; x++)
            {
                for (int y = 1; y < 99; y++)
                {
                    if (laby[x, y] == true)
                        PKletka(x, y);
                }
            }

            g.DrawImageUnscaled(b, 1, 1);
        }

        private void ClearAll()
        {
            g.Clear(Color.Black);
            b = new Bitmap(600, 600);
            for (int x = 1; x < 99; x++)
            {
                for (int y = 1; y < 99; y++)
                {
                    laby[x, y] = false;
                }
            }
        }

        private void LabyInit()
        {
            Random r = new Random();
            int t = 0;
            for (int x = 1; x < 99; x++)
            {
                for (int y = 1; y < 99; y++)
                {
                    t = r.Next(1, 11);
                    if (t == 1) laby[x, y] = true;
                }
            }

            for (int x = 1; x < 99; x++)
            {
                for (int y = 1; y < 99; y++)
                {
                    PathMaker(x, y);
                }
            }
        }

        private void PathMaker(int x, int y)
        {
            int c = 0;
            if (y > 1)
                if (laby[(x), (y - 1)] == true) c++;
            if (x < 99)
                if (laby[(x + 1), (y)] == true) c++;
            if (y < 99)
                if (laby[(x), (y + 1)] == true) c++;
            if (x > 1)
                if (laby[(x - 1), (y)] == true) c++;

            if (c == 4) laby[x, y] = false;

            if (c < 2)
            {
                Random r = new Random();
            lable1:
                switch(r.Next(1, 5))
                {
                    case 1:
                        if (y > 1)
                        {
                            if (laby[(x), (y - 1)] == true) goto lable1;
                            else
                            {
                                laby[(x), (y - 1)] = true;
                                PathMaker((x), (y - 1));
                            }
                        }
                        else goto lable1;
                        break;
                    case 2:
                        if (x < 99)
                        {
                            if (laby[(x + 1), (y)] == true) goto lable1;
                            else
                            {
                                laby[(x + 1), (y)] = true;
                                PathMaker((x + 1), (y));
                            }
                        }
                        else goto lable1;
                        break;
                    case 3:
                        if (y < 99)
                        {
                            if (laby[(x), (y + 1)] == true) goto lable1;
                            else
                            {
                                laby[(x), (y + 1)] = true;
                                PathMaker((x), (y + 1));
                            }
                        }
                        else goto lable1;
                        break;
                    case 4:
                        if (x > 1)
                        {
                            if (laby[(x - 1), (y)] == true) goto lable1;
                            else
                            {
                                laby[(x - 1), (y)] = true;
                                PathMaker((x - 1), (y));
                            }
                        }
                        else goto lable1;
                        break;
                }
            }
        }



        private void button1_Click(object sender, EventArgs e)
        {
            ClearAll();
            DrawSetka();
            LabyInit();

            //

            ViewResult();
        }
    }
}