using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using DG.Tweening;
using Sirenix.OdinInspector;

/// <summary>
/// 以撒鬼魂类，控制以撒攻击时出现的鬼魂
/// </summary>
public class YiSaGoust : MonoBehaviour
{   
    /// <summary>
    /// 冲撞将消耗的时间
    /// </summary>
    [Header("冲撞将消耗的时间")]
    public float rushTime;
    private YiSa owner;
    /// <summary>
    /// 落雷的游戏物体
    /// </summary>
    [Header("落雷的游戏物体")][HideInInspector]
    public GameObject lightning;

    [Header("粒子材质")] 
    #pragma warning disable 0108
    public ParticleSystem particleSystem;
    private CapsuleCollider2D capsuleCollider2D;
    public Animator animator;
    void Start(){
        Init();
    }
    private void Init(){
        //找到必要的组件和物体
        animator = GetComponent<Animator>();
        owner = FindObjectOfType<YiSa>();
        capsuleCollider2D = GetComponent<CapsuleCollider2D>();
        //如果落雷没有落雷组件,则添加一个
        lightning = GameObject.Find("落雷").transform.GetChild(0).gameObject;
        if(!lightning.TryGetComponent<Lightning>(out Lightning t))
            lightning.AddComponent<Lightning>();
    }
    public void RushATK(Vector2 rushDir){
        //创建并执行一段冲锋的动画
        capsuleCollider2D.enabled = true;
        Tweener tweener = transform.DOMove(
            transform.position + (Vector3)rushDir * 2,
            rushTime
        );
        tweener.SetEase(Ease.InElastic);
        //结束后,鬼魂逐渐消隐
        TweenCallback action = () => {
            capsuleCollider2D.enabled = false;
            GetComponent<SpriteRenderer>().DOFade(0,1);
            StartCoroutine(SetParticleColor(particleSystem, 0, 1f));
            //消隐结束后删除自己
            Invoke("DestroySelf",1.1f);
            //宣告攻击结束
            owner.ATKEnd();
        };
        tweener.OnStepComplete(action);
    }

    /// <summary>
    /// 闪电攻击的时候触发
    /// </summary>
    public void LightningATK(){
        //激活落雷
        lightning.SetActive(true);
        //将落雷的X位置改变到鬼魂的X
        lightning.transform.position = new Vector3(
            transform.position.x,
            lightning.transform.position.y,
            lightning.transform.position.z
        );
        //极短的时间后关闭落雷
        Invoke("TurnOffLightning",0.2f);
        //宣告攻击结束
        owner.ATKEnd();
        //淡出鬼魂
        StartCoroutine(SetParticleColor(particleSystem, 0, 1f));
        GetComponent<SpriteRenderer>().DOFade(0,1).OnStepComplete(()=>{
            
            //淡出结束后,删除游戏物体
            Destroy(gameObject);
        });
    }

    private void TurnOffLightning(){lightning.SetActive(false);}
    private void DestroySelf(){Destroy(gameObject);}

    void OnTriggerEnter2D(Collider2D other)
    {
        //如果创到玩家
        if(other.gameObject.TryGetComponent<MyPlayer>(out MyPlayer player)){
            //告诉玩家，你被攻击了
            player.OnBeHit(owner.ATK, 
                ((transform.position.x - 
                player.transform.position.x)
                    > 0) ? 1 : -1);//通过自身位置和玩家位置的比较来返回玩家本次的受击方向
        }
    }

    private class Lightning : MonoBehaviour
    {
        void OnTriggerStay2D(Collider2D other){
            //如果创到玩家
            if(other.gameObject.TryGetComponent<MyPlayer>(out MyPlayer player)){
                //告诉玩家，你被攻击了
                player.OnBeHit(FindObjectOfType<YiSa>().ATK, 
                    ((transform.position.x - 
                    player.transform.position.x)
                        > 0) ? 1 : -1);//通过自身位置和玩家位置的比较来返回玩家本次的受击方向
            }
        }
    }

    //修改粒子，使粒子淡出
    private IEnumerator SetParticleColor(ParticleSystem particleSystem,float endValue,float speed)
    {
        #pragma warning disable 0618
        Color color = particleSystem.startColor;
        while (particleSystem.startColor.a>0)
        {
            yield return new WaitForSeconds(speed/255);
            color.a -= 1;
            particleSystem.startColor = color;
        }
        
    }
}