using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.XR.Interaction.Toolkit;

[RequireComponent(typeof(XRRayInteractor))]
public class CrosshairDisplay : MonoBehaviour, IListener
{
    [SerializeField] GameObject crosshairPrefab = null;
    [SerializeField] float maxDistance = 100f;

    XRRayInteractor ray;
    GameObject crosshair = null;
    Camera cam;
    new Renderer renderer;

    void Awake()
    {
        ray = GetComponent<XRRayInteractor>();
        crosshair = Instantiate(crosshairPrefab);
        if (crosshair) renderer = crosshair.GetComponent<Renderer>();
        cam = Camera.main;

        EventManager.Instance.AddListener(EVENT_TYPE.ON_FIRE_CROSSHAIR_ALPHA_CHANGED_LEFT, this);
        EventManager.Instance.AddListener(EVENT_TYPE.ON_FIRE_CROSSHAIR_ALPHA_CHANGED_RIGHT, this);
    }

    void Update()
    {
        if(crosshair && ray.TryGetCurrent3DRaycastHit(out RaycastHit hit))
        {
            crosshair.transform.position = hit.point;
            Vector3 currentRotation = crosshair.transform.rotation.eulerAngles;
            Vector3 direction = hit.point - cam.transform.position;
            float eulerY = Quaternion.LookRotation(direction, Vector3.up).eulerAngles.y;
            crosshair.transform.rotation = Quaternion.Euler(currentRotation.x, eulerY, currentRotation.z);
            if (Vector3.Distance(hit.point, cam.transform.position) > maxDistance) renderer.enabled = false;
            else renderer.enabled = true;
        }
    }

    public void OnEvent<T>(EVENT_TYPE eventType, Component Sender, T param = default)
    {
        switch (eventType)
        {
            case EVENT_TYPE.ON_FIRE_CROSSHAIR_ALPHA_CHANGED_LEFT:
                renderer.material.SetFloat("_AlphaLeftEye", (dynamic)param);
                break;
            case EVENT_TYPE.ON_FIRE_CROSSHAIR_ALPHA_CHANGED_RIGHT:
                renderer.material.SetFloat("_AlphaRightEye", (dynamic)param);
                break;
        }
    }
}