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

public class NewBehaviourScript : MonoBehaviour
{

    //移动速度
    public float speed = 5f;

    //活动范围
    public float range = 500f;

    //侦查范围
    public float detectRange = 200f;

    //攻击范围
    public float attackRange = 5f;

    //角色状态
    private State state = State.Alert;

    //攻击目标
    public GameObject target;

    //当前目标点
    private Vector3 targetPos;

    //初始位置坐标
    private Vector3 startPos;

    //动画控制器
    private Animator animator;

    // 角色控制器
    private CharacterController controller;

    //状态枚举
    public enum State
    {
        //警戒巡逻
        Alert,

        //追踪状态
        Track, 

        //攻击状态
        Attack
    }





    // Start is called before the first frame update
    void Start()
    {
        //初始化
        animator = GetComponent<Animator>();
        controller = GetComponent<CharacterController>();
        //记录初始坐标
        startPos = transform.position;
        randomTargetPos();
    }



    // Update is called once per frame
    void Update()
    {
        //攻击状态直接返回
        if (state == State.Attack)
        {
            return;
        }

        //角色在攻击状态则返回
        if (state == State.Alert)
        {
            //移动
            move(targetPos - transform.position);
            //到达目标点时候随机目标点
            if (Vector3.Distance(transform.position, targetPos) < 0.1f)
            {
                randomTargetPos();
            }
        }

        //获取侦查范围内除自己以外的Player层的单位
        var players = Physics.OverlapSphere(transform.position, detectRange, LayerMask.GetMask("Player"));
        //如果存在单位
        if (players.Length > 0)
        {
            //找出标签是Friend的,并且不是自己
            foreach (var player in players)
            {
                if (player.tag == "Friend" && player != gameObject)
                {
                    //进入追逐状态
                    state = State.Track;
                    float dis = Vector3.Distance(transform.position, player.transform.position);
                    //和目标的距离在攻击范围外则朝目标移动
                    if (dis > attackRange)
                    {
                        move(player.transform.position - transform.position);
                        //打印动画speed的值
                        Debug.Log(animator.GetInteger("speed"));
                    }
                    else
                    {
                        attack(player);
                    }
                }
            }
        }
        

    }

    //攻击
    private void attack(Collider player)
    {
        //转向攻击目标
        transform.rotation = Quaternion.LookRotation(player.transform.position - transform.position, Vector3.up);
        //攻击动画动作
        animator.SetTrigger("attack");
        state = State.Attack;
    }


    // 在 Animator 的 Attack 动画结束时调用此方法
    public void OnAttackAnimationEnd()
    {
        //打印
        Debug.Log("攻击结束");
        state = State.Alert;
    }



    //角色移动,持续到目标点
    void move(Vector3 movement)
    {
        //改变动画控制器的参数
        animator.SetInteger("speed", 1);
        //向目标点移动
        controller.Move(movement.normalized * Time.deltaTime * speed);
        //改变角色朝向目标点,只改变y轴
        transform.rotation = Quaternion.LookRotation(movement, Vector3.up);
        transform.rotation = Quaternion.Euler(0, transform.rotation.eulerAngles.y, 0);
    }


    //随机目标点
    private void randomTargetPos()
    {
        //以startPos为中心，range为半径，y为0的圆形内随机一个点复制到targetPos
        targetPos = new Vector3(Random.Range(-range, range), 0, Random.Range(-range, range));
    
    }
}