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

public class GrassAreaRecorder : MonoBehaviour
{
    public static GrassAreaRecorder ins;

    void Awake()
    {
        ins = this;
        init();
    }

    void OnDestroy()
    {
        ins = null;
    }

    void init() {
        areaPosList = new AreaInfo[this.transform.childCount];
        int i = 0;
        foreach (Transform child in this.transform)
        {
            child.gameObject.SetActive(false);
            //顺便记录子物体关键信息
            AreaInfo areaInfo = new AreaInfo();
            areaInfo.pos = child.transform.position;
            areaInfo.radius = child.transform.lossyScale.x / 2;
            areaPosList[i] = areaInfo;
            i++;
        }
    }

    private struct AreaInfo {
        public Vector3 pos;
        public float radius;
    }

    private AreaInfo[] areaPosList;

    public bool isInValidArea(Vector3 worldPosition) {
        foreach (AreaInfo areaInfo in areaPosList)
        {
            if (Vector3.Distance(areaInfo.pos, worldPosition) < areaInfo.radius) {
                return true;
            }
        }
        return false;
    } 

    public Vector3 randomOneValidAreaPoint() {
        return areaPosList[Random.Range(0, areaPosList.Length)].pos;
    }
}