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

public class RayHit : MonoBehaviour
{

    public Color c1 = Color.yellow;
    public Color c2 = Color.red;
    public int lengthOfLineRenderer = 4;

    ArrayList<Vector3> linePoints = new ArrayList<Vector3>(); 

    void Start()
    {
        LineRenderer lineRenderer = gameObject.AddComponent<LineRenderer>();
        lineRenderer.material = new Material(Shader.Find("Particles/Additive"));
        lineRenderer.widthMultiplier = 0.01f;
        //  lineRenderer.numPositions
        lineRenderer.numPositions = lengthOfLineRenderer;

        // A simple 2 color gradient with a fixed alpha of 1.0f.
        float alpha = 1.0f;
        Gradient gradient = new Gradient();
        gradient.SetKeys(
            new GradientColorKey[] { new GradientColorKey(c1, 0.0f), new GradientColorKey(c2, 1.0f) },
            new GradientAlphaKey[] { new GradientAlphaKey(alpha, 0.0f), new GradientAlphaKey(alpha, 1.0f) }
            );
        lineRenderer.colorGradient = gradient;
    }


    void Update()
    {
        Ray a = new Ray(transform.position, transform.forward);
        Ray b;
        RaycastHit hit;

        if (Deflect(a, out b, out hit))
        {
            LineRenderer lineRenderer = GetComponent<LineRenderer>();
           
            lineRenderer.SetPosition(0, a.origin);
            lineRenderer.SetPosition(1, hit.point);
            lineRenderer.SetPosition(2, (b.origin));
            lineRenderer.SetPosition(3, b.origin + 3 * b.direction);
        }
    }

    bool Deflect(Ray ray, out Ray deflected, out RaycastHit hit)
    {
        if (Physics.Raycast(ray, out hit))
        {
            Vector3 normal = hit.normal;
            Vector3 deflect = Vector3.Reflect(ray.direction, normal);

            deflected = new Ray(hit.point, deflect);
            return true;
        }

        deflected = new Ray(Vector3.zero, Vector3.zero);
        return false;
    }
}