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

[System.Serializable]
public class Buterfly
{
    public Transform objectRef;
    public Vector3 targetPos;
    Vector3 randomPos;

    public Buterfly(Transform objectRef, Vector3 targetPos)
    {
        this.objectRef = objectRef;
        this.targetPos = targetPos;
    }

    public void Ai()
    {
        if(Vector3.Distance(objectRef.position, targetPos) < 0.1f)
        {
            targetPos = GetRandomPos(objectRef.parent.position);
        }
        else
        {
            //objectRef.position = Vector3.Lerp(objectRef.position, targetPos, Time.deltaTime * 2);
            objectRef.Translate(Vector3.forward * Time.deltaTime * 2f);
            objectRef.rotation = Quaternion.Lerp(objectRef.rotation, Quaternion.LookRotation(targetPos - objectRef.position, objectRef.forward), Time.deltaTime * 2);
        }
    }

    public static Vector3 GetRandomPos(Vector3 origionPos)
    {
        return origionPos + new Vector3(Random.Range(-2, 2f), Random.Range(0, 2f), Random.Range(-2, 2f));
    }
}

public class ButerflyMain : MonoBehaviour
{
    public int count;
    public GameObject buterflyRes;
    public Buterfly[] buterflies;

    // Start is called before the first frame update
    void Start()
    {
        buterflies = new Buterfly[count];
        for(int i = 0; i < count; ++i)
        {
            GameObject clone = Instantiate(buterflyRes, Buterfly.GetRandomPos(transform.position), Quaternion.Euler(Vector3.right * Random.Range(0, 360f)), transform);
            buterflies[i] = new Buterfly(clone.transform, Buterfly.GetRandomPos(transform.position));
            buterflies[i].objectRef.GetComponent<MeshRenderer>().material.SetFloat("_Index", Random.Range(0, 9));
        }
    }

    // Update is called once per frame
    void Update()
    {
        if (Vector3.Distance(transform.position, Camera.main.transform.position) > 30) { return; }

        for (int i = 0; i < count; ++i)
        {
            buterflies[i].Ai();
        }
    }
}