using System;
using System.Collections.Generic;
using System.Linq;
using System.Security.Cryptography.Xml;
using System.Text;
using System.Threading.Tasks;

namespace Snake
{
    public class Map
    {
        public Cell[,] Cells;
        private int _h;
        private int _w;
        private const int CELL_SIZE = 20;

        public Map(int h, int w)
        {
            Cells = new Cell[h, w];
            _h = h;
            _w = w;

            for (int x = 0; x < _w; x++)
            {
                for (int y = 0; y < _h; y++)
                {
                    Cells[x, y] = new Cell(x, y, CellTypes.None);
                }
            }
        }

        public void SetCell(Cell cell)
        {
            Cells[cell.X,cell.Y] = cell;
        }

        public void SwapCells(Cell cell1, Cell cell2)
        {
            int tmpX = cell1.X;
            int tmpY = cell1.Y;

            cell1.X = cell2.X; cell1.Y = cell2.Y;

            cell2.X = tmpX; cell2.Y = tmpY;

            Cells[cell1.X, cell1.Y] = cell1;
            Cells[cell2.X, cell2.Y] = cell2;
        }

        public void Render(Graphics graphics)
        {
            SolidBrush brush = new SolidBrush(Color.RebeccaPurple);

            for (int x = 0; x < _w; x++)
            {
                for (int y = 0; y < _h; y++)
                {
                    Cell cell = Cells[x,y];

                    if (cell.Type == CellTypes.None)
                    {
                        brush.Color = Color.LightGray;
                    }
                    else if (cell.Type == CellTypes.Snake)
                    {
                        brush.Color = Color.Green;
                    }
                    else if (cell.Type == CellTypes.Food)
                    {
                        brush.Color = Color.Red;
                    }

                    int totalHeight = CELL_SIZE * _h;

                    graphics.FillRectangle(brush,
                        x * 20,
                        totalHeight - y * 20,
                        CELL_SIZE,
                        CELL_SIZE
                    );
                }
            }
        }
    }
}