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

public class PointMoveCtr : MonoBehaviour
{
    //이펙트 이동 기준 오브젝트
    public Transform pointsParent;
    //시작 점 번호
    public int startPoint;
    //한바퀴 도는데 걸리는 시간
    public float loopTime;

    private List<Transform> cornerPointList = new List<Transform>();

    void Awake()
    {
        for(int i = 0; i < pointsParent.childCount; i++)
        {
            cornerPointList.Add(pointsParent.GetChild(i));
        }
    }

    void OnEnable()
    {
        StartCoroutine(EffectMove());
    }

    private IEnumerator EffectMove()
    {
        if (cornerPointList.Count == 0)
            yield break;

        transform.localPosition = cornerPointList[startPoint].localPosition;

        int nextPoint = startPoint + 1;
        if (nextPoint >= cornerPointList.Count)
            nextPoint = 0;
        
        float time = loopTime / cornerPointList.Count;
        float runTime = time;
        while (runTime > 0f)
        {
            transform.localPosition = Vector3.Lerp(cornerPointList[startPoint].localPosition, cornerPointList[nextPoint].localPosition, (time - runTime) / time);
            yield return null;
            runTime -= Time.unscaledDeltaTime;
        }
        
        startPoint++;
        if (startPoint >= cornerPointList.Count)
            startPoint = 0;

        StartCoroutine(EffectMove());
    }
}