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

[RequireComponent(typeof(TrailRenderer))]
public class TrailRenderScaleScript : MonoBehaviour
{
    private TrailRenderer _render;
    [Range(0,1)]
    public float _scale = 1;

    public float _oldWidthMultiplier = 1;
    public float _oldStartWidth = 1;
    public float _oldEndWidth = 0;   
    public float _oldDis = 1;

    private void OnEnable()
    {
        _render = GetComponent<TrailRenderer>();
        _oldStartWidth = _render.startWidth;
        _oldEndWidth = _render.endWidth;
        _oldWidthMultiplier = _render.widthMultiplier;
        _oldDis = _render.minVertexDistance;
        var vs = transform.lossyScale;
        _scale = Mathf.Max(vs.x, vs.y, vs.z);
        TrailChanged(_scale);
    }

    private void OnDisable()
    {
        TrailChanged(1);
    }

    private void OnDestroy()
    {
        TrailChanged(1);
    }

    private void Update()
    {
        if (Time.frameCount % 10 == 0)
        {
            var vs = transform.lossyScale;
            var s = Mathf.Max(vs.x, vs.y, vs.z);
            if (Mathf.Abs(s - _scale) > 0.001)
            {
                _scale = s;
                TrailChanged(_scale);
            }
        }
    }

    private void TrailChanged(float scale)
    {
        if (_render != null)
        {
            _render.widthMultiplier = _oldWidthMultiplier * scale;
            _render.startWidth = _oldStartWidth * scale;
            _render.endWidth = _oldEndWidth * scale;
            _render.minVertexDistance = _oldDis * scale;
        }
    }
}