using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Snake
{
    public class Game
    {
        //new Cell(10, 10, CellTypes.Snake)
        Worm worm;
        private Directions _direction = Directions.Down;
        Map map;
        Form1 form;

        public Game(Form1 form)
        {
            this.form = form;
        }

        public void Start()
        {
            Cell startCell = new Cell(10, 10, CellTypes.Snake);
            map = new Map(20, 20);
            map.SetCell(startCell);
            worm = new Worm(startCell);

            map.SetCell(new Cell(15, 10, CellTypes.Food));
            map.SetCell(new Cell(15, 11, CellTypes.Food));
            map.SetCell(new Cell(15, 12, CellTypes.Food));
            map.SetCell(new Cell(15, 13, CellTypes.Food));
            map.SetCell(new Cell(15, 14, CellTypes.Food));
            map.SetCell(new Cell(15, 15, CellTypes.Food));
            map.SetCell(new Cell(15, 16, CellTypes.Food));
            map.SetCell(new Cell(15, 17, CellTypes.Food));
            map.SetCell(new Cell(15, 18, CellTypes.Food));
        }

        public void UpdateInput(Directions direction)
        {
            _direction = direction;
        }

        public Cell GetNextCell(int x, int y)
        {
            if (_direction == Directions.Up)
            {
                return map.Cells[x, y + 1];
            }

            if (_direction == Directions.Left)
            {
                return map.Cells[x - 1, y];
            }

            if (_direction == Directions.Down)
            {
                return map.Cells[x, y - 1];
            }

            // Right
            return map.Cells[x + 1, y];
        }

        public void Update()
        {
            int x = worm.Body[0].X;
            int y = worm.Body[0].Y;

            Cell snakeCell = map.Cells[x, y];
            Cell nextCell = GetNextCell(x, y);

            if (nextCell.Type == CellTypes.Food)
            {
                worm.Eat(ref nextCell);
                //map.SetCell(nextCell);
            }

            map.SwapCells(snakeCell, nextCell);
            worm.Move(x, y, map);

            map.Render(form.gamearea.CreateGraphics());
            form.Invalidate();
        }
    }
}