using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using System.Collections.Generic;
using System.Linq;
using System;
using UnityEngine.UI;
public class Snake : MonoBehaviour
{
    public GameObject weiba;.//插入一个尾巴
    public float spead = 0.3f;//浮动时间值
    Vector2 dir = Vector2.right;//默认动方向
    List<Transform> tail  =  new List<Transform> ();
    public int Fenshudangqian;
    public Text Denfenkuang;
    public static bool eat =false ;
    public Action Onloss;
    
    // Start is called before the first frame update
    void Start()
    {
        InvokeRepeating("Move", spead, spead);
    }
    void Move()
    {
        Vector2 v = transform.position;
        transform.Translate(dir);
        if (eat)
        {
            GameObject g = (GameObject)Instantiate(weiba, v, Quaternion.identity);
            tail.Insert(0, g.transform);
            eat = false;
        }
        else if(tail.Count >0)
        {
            tail.Last().position = v;
            tail.Insert(0, tail.Last());
            tail.RemoveAt (tail.Count-1);
        }
    }
    // Update is called once per frame
    void Update()
    {
        //控制小蛇方向
        if (Input.GetKey(KeyCode.RightArrow))
            dir = Vector2.right;
        else if (Input.GetKey(KeyCode.DownArrow))
            dir = Vector2.down;
        else if (Input.GetKey(KeyCode.LeftArrow))
            dir = Vector2.left;
        else if (Input.GetKey(KeyCode.UpArrow))
            dir = Vector2.up;
    }
    public void OnTriggerEnter2D(Collider2D coll)
    {
        //物体碰撞计算
        Debug .Log ("get血包");
        if (coll.name.StartsWith("food"))
        {
            eat = true;
            Destroy(coll.gameObject);
            Fenshudangqian++;
            Denfenkuang.text = Fenshudangqian.ToString();
        }
        else 
        {
            //负责发送东西
            if (Onloss != null)
                Onloss();
        }
    }
}