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

namespace 贪吃蛇
{
    class GameScene : ISceneUpdate
    {
        Map map;
        Snake snake;
        Food food;
        public GameScene()
        {
            map = new Map();
            snake = new Snake(40, 10);
            food = new Food(snake);
        }
        public void Update()
        {
            
            map.Draw();//画地图
            food.Draw();//画食物
            snake.Move();//让蛇动起来
            snake.Draw();//画蛇 
            if (snake.CheckEnd(map))//检测游戏是否结束
            {
                Game.ChangeScene(E_Scene.End);
            }
            snake.CheckEat(food);//检测蛇是否吃到食物
            Thread.Sleep(200);//控制蛇的移动速度
            //检测用户输入
            if (Console.KeyAvailable)//Console.KeyAvailable的作用是：如果有按键输入才返回Ture，防止卡住
            {
                switch (Console.ReadKey(true).Key)
                {
                    case ConsoleKey.W:
                    case ConsoleKey.UpArrow:
                        snake.ChangeDirection(E_MoveDirection.Up);
                        //向上
                        break;
                    case ConsoleKey.S:
                    case ConsoleKey.DownArrow:
                        snake.ChangeDirection(E_MoveDirection.Down);
                        //向下
                        break;
                    case ConsoleKey.A:
                    case ConsoleKey.LeftArrow:
                        snake.ChangeDirection(E_MoveDirection.Left);
                        //向左
                        break;
                    case ConsoleKey.D:
                    case ConsoleKey.RightArrow:
                        snake.ChangeDirection(E_MoveDirection.Right);
                        //向右
                        break;
                    default:
                        break;
                }
            }
            
        }
    }
}