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

public class ObjectFader : MonoBehaviour
{

    Transform myTransform;
    [SerializeField] Transform Player;

    [SerializeField] LayerMask ignoredLayer;

    class RendererProperties
    {
        public RendererProperties()
        { }

        public RendererProperties(Renderer r)
        {
            renderer = r;
            justAdded = true;
        }

        public Renderer renderer;
        public bool justAdded;
    }

    List<RendererProperties> faded_objects = new List<RendererProperties>();

    // Start is called before the first frame update
    void Start()
    {
        myTransform = transform;
    }

    private void FixedUpdate()
    {
        Vector3 dir = Player.position - myTransform.position;
        float distance = dir.magnitude;
        RaycastHit[] hits = Physics.RaycastAll(myTransform.position, dir.normalized, distance, ~ignoredLayer);

        foreach (var i in faded_objects)
        {
            i.justAdded = false;
        }

        if (hits.Length > 0)
        {
            FadeObjects(hits);
        }

        RestoreObjects();

        Debug.DrawRay(myTransform.position, dir, Color.red);
    }


    void FadeObjects(RaycastHit[] hits)
    {
        foreach (var hit in hits)
        {
            Renderer r = hit.transform.GetComponent<Renderer>();
            if (r == null) continue; // questo oggetto non e' renderizzato quindi non serve processarlo

            bool found = false;
            foreach (var rp in faded_objects)
            {
                if (rp.renderer == r)
                {
                    rp.justAdded = true;
                    found = true;
                    break;
                }
            }
            if (!found)
            {
                faded_objects.Add(new RendererProperties(r));
                r.enabled = false;
                Debug.Log("Added " + r.transform.name);
            }

        }
    }

    void RestoreObjects()
    {
        List<RendererProperties> remove = new List<RendererProperties>();

        foreach (var i in faded_objects)
        {
            if (!i.justAdded)
            {
                remove.Add(i);
                i.renderer.enabled = true;
            }
        }

        for (int i = 0; i < remove.Count; i++)
        {
            faded_objects.Remove(remove[i]);
            Debug.Log("Removed " + remove[i].renderer.transform.name);
        }
    }

}