import java.util.*;

public class snake{
    Deque<cell> snakeList = new ArrayDeque<>();
    cell head;

    public snake(cell startPos){
        head = startPos;
        snakeList.add(startPos);
        head.setSnakeCell(true);
    }

    public void grow(cell nextCell){
        nextCell.setSnakeCell(true);
        head = nextCell;
        snakeList.addFirst(nextCell);
        
    }

    public void move(cell nextCell){
        cell tail = snakeList.removeLast();
        tail.setEmptyCell(true);

        head = nextCell;
        snakeList.addFirst(nextCell);
        for(cell c : snakeList){
            c.setSnakeCell(true);
        }
    }

    public boolean checkCrash(cell nextCell){
        for(cell cell : snakeList){
            if(cell == nextCell) { return true; }
        }

        return false;
    }

    public Deque<cell> getSnakeList(){ return snakeList; }

    public cell getHead(){ return head; }

    public void setSnakeList(Deque<cell> snakeList){
        this.snakeList = snakeList;
    }
}