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using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class PlayerController : MonoBehaviour
{
    Rigidbody2D rbody;//Rigidbody2D类型的变量
    float axisH = 0.0f;//输入
    public float speed = 3.0f;//移动速度

    public float jump = 9.0f;//跳跃力
    public LayerMask groundLayer;//可以落脚的层
    bool goJump = false;//跳跃开始的旗标
    bool onGround = false;//立于地面的旗标
    Animator animator;//画师
    public string stopAnime = "PlayerStop";
    public string moveAnime = "PlayerMove";
    public string jumpAnime = "PlayerJump";
    public string goalAnime = "PlayerGoal";
    public string deadAnime = "PlayerDead";
    string nowAnime = "";
    string oldAnime = "";
    
    public static string gameState = "playing";//游戏的状态
    
    // Start is called before the first frame update
    void Start()
    {
        //取得Rugidbody2D
        rbody = this.GetComponent<Rigidbody2D>();
        gameState = "playing";//设为游戏中
        //取得Animator
        animator = GetComponent<Animator>();
        nowAnime = stopAnime;
        oldAnime = stopAnime;
    }
    
    // Update is called once per frame
    void Update()
    {
        if (gameState != "playing") return;
        //检查水平方向的输入
        axisH = Input.GetAxisRaw("Horizontal");
        //方向调整
        if (axisH > 0.0f)
        {
            //向右移动
            Debug.Log("向右移动");
            transform.localScale = new Vector2(1, 1);
        }
        else if (axisH < 0.0f) {
            //向左移动
            Debug.Log("向左移动");
            transform.localScale = new Vector2(-1, 1);//左右翻转
        }
        if (Input.GetButtonDown("Jump"))
        {
            Jump();//跳跃
        }
    
    }
    
    void FixedUpdate()
    {
        if (gameState != "playing") return;
        //地面判定
         bool onGround = Physics2D.Linecast(transform.position, transform.position - (transform.up * 0.1f), groundLayer);
        if (onGround || axisH != 0)
        {
            //在地面上或速度不为0
            //更新速度
            rbody.velocity = new Vector2(axisH * speed, rbody.velocity.y);
        }
        if (goJump)//if(onGround &&goJump)
        {
            //在地面上按下了跳跃键
            //跳起来
            Debug.Log("跳跃！");
            Vector2 jumpPw = new Vector2(0, jump);//新建用于跳跃的向量
            rbody.AddForce(jumpPw, ForceMode2D.Impulse);//施加瞬间的力
            goJump = false;//取下跳跃旗标
        }
        if (axisH != 0 || axisH == 0)//if(onGround)
        {
            //在地面上
            if (axisH == 0)
            {
                nowAnime = stopAnime;//停止
            }
            else
            {
                nowAnime = moveAnime;
            }
        }
        else
        {
            //空中
            nowAnime = jumpAnime;
        }
        if (nowAnime != oldAnime)
        {
            oldAnime = nowAnime;
            animator.Play(nowAnime);//播放动画效果
        }
    }


    //跳跃
    public void Jump()
    {
        goJump = true;
        Debug.Log("按下了跳跃键！");
    }
    
    //接触开始
    void OnTriggerEnter2D(Collider2D collision)
    {
        if (collision.gameObject.tag == "Goal"){
            Goal();
        }else if (collision.gameObject.tag == "Dead")
        {
            GameOver(); 
        }
    }
    //到达终点
    public void Goal()
    {
        animator.Play(goalAnime);
        gameState = "gameclear";
        GameStop();//游戏停止
    }
    //游戏失败
    public void GameOver()
    {
        animator.Play(deadAnime);
        gameState = "gameover";
        GameStop();
        GetComponent<CapsuleCollider2D>().enabled=false;
        rbody.AddForce(new Vector2(0,5),ForceMode2D.Impulse);
     }

//游戏停止
void GameStop()
    {
    Rigidbody2D rbody = GetComponent<Rigidbody2D>();
    rbody.velocity = new Vector2(0, 0);
    }

}