using System.Collections.Generic;
using UnityEngine;

public class HideWall : MonoBehaviour
{
    public static HideWall instance;

    [SerializeField] private GameObject originalTarget;
    public GameObject target;
    [SerializeField] private GameObject origin;

    [Range(1f, 10f)] public float hideFadeSpeed;
    [Range(1f, 10f)] public float showFadeSpeed;

    public float sphereRadius;

    float maxSphereRayDistance;

    private List<GameObject> prevHitObjects = new List<GameObject>();

    private void Start()
    {
        if (instance == null)
            instance = this;
    }

    void Update()
    {
        if (target == null)
            target = originalTarget;

        maxSphereRayDistance = Vector3.Distance(origin.transform.position, target.transform.position) - (sphereRadius);

        Vector3 direction = (target.transform.position - origin.transform.position).normalized;
        RaycastHit[] hits = Physics.SphereCastAll(origin.transform.position, sphereRadius, direction, maxSphereRayDistance);

        List<GameObject> hitObjectsThisFrame = new List<GameObject>();


        for (int i = 0; i < hits.Length; i++)
        {
            //print(hits[i].collider.gameObject.name);
            if (hits[i].collider != null)
            {
                var hitGameObject = hits[i].collider.gameObject;
                hitObjectsThisFrame.Add(hitGameObject);

                var wallOpacity = hitGameObject.GetComponent<WallOpacity>();
                if (wallOpacity != null && !prevHitObjects.Contains(hitGameObject))
                {
                    wallOpacity.HideWall(hideFadeSpeed);
                }
            }
        }

        foreach (var prevHitObject in prevHitObjects)
        {
            if (prevHitObject == null) break;
            if (!hitObjectsThisFrame.Contains(prevHitObject))
            {
                var wallOpacity = prevHitObject.GetComponent<WallOpacity>();
                if (wallOpacity != null)
                {
                    wallOpacity.ShowWall(showFadeSpeed);
                }
            }
        }

        prevHitObjects = hitObjectsThisFrame;
    }

    private void OnDrawGizmos()
    {
        Gizmos.color = Color.red;
        Gizmos.DrawWireSphere(origin.transform.position, sphereRadius);

        maxSphereRayDistance = Vector3.Distance(origin.transform.position, target.transform.position) - (sphereRadius);
        Vector3 direction = (target.transform.position - origin.transform.position).normalized;
        Gizmos.DrawRay(origin.transform.position, direction * maxSphereRayDistance);
    }
}