using InfallibleCode;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.UI;

public class PlayerOverlapSphereDetectorManager : MonoBehaviour
{
    private Camera _camera;
    [HideInInspector] public RaycastHit hit;

    [Header("Interact")]
    [SerializeField] private float _visibilityRadious = 4;
    public LayerMask obstacleLayer; // Set this to the layer where obstacles reside

    [SerializeField] private GameObject _visibilityUIPrefab;

    private static PlayerOverlapSphereDetectorManager _instance;
    public static PlayerOverlapSphereDetectorManager GetInstance() { return _instance; }

    private void Awake()
    {
        if (!_instance)
        {
            _instance = this;
        }
    }

    private void Start()
    {
        _camera = PlayerManager.GetInstance().PlayerMainCamera.GetComponent<Camera>();
    }

    private void Update()
    {
        CanSeeItem();

    }

    public void CanSeeItem()
    {
        // Adjust the position and radius as needed
        Collider[] colliders = Physics.OverlapSphere(_camera.transform.position, _visibilityRadious);

        foreach (Collider collider in colliders)
        {
            ItemVisibilityIcon visibilityIcon = null;

            // Check if the pickup has the ItemVisibilityIcon component
            if (TryGetVisibilityIconComponent(collider, out visibilityIcon))
            {
                // Check if there is a clear line of sight
                if (IsClearLineOfSight(collider.transform.position, collider))
                {
                    // Instantiate the prefab if it doesn't exist
                    if (visibilityIcon.VisibilityPrefab == null)
                    {
                        visibilityIcon.VisibilityPrefab = Instantiate(_visibilityUIPrefab, collider.transform.position, Quaternion.identity, visibilityIcon.transform);
                    }
                }
                else
                {
                    if (visibilityIcon.VisibilityPrefab != null)
                    {
                        // Destroy the prefab if there is an obstacle in the way
                        print("Destroy Visibility icon");
                        //Destroy(visibilityIcon.VisibilityPrefab);
                        StartCoroutine(DestroyAfterSeconds(visibilityIcon.VisibilityPrefab, visibilityIcon));
                        //visibilityIcon.VisibilityPrefab = null;
                    }
                }
            }
        }

        // Check for pickups that are no longer in the overlap sphere
        CheckForOutOfRangePickups(colliders);
    }

    private bool TryGetVisibilityIconComponent(Collider collider, out ItemVisibilityIcon visibilityIcon)
    {
        visibilityIcon = collider.GetComponent<ItemVisibilityIcon>();
        return visibilityIcon != null;
    }

    private void CheckForOutOfRangePickups(Collider[] colliders)
    {
        GameObject[] visiblePrefabs = GameObject.FindGameObjectsWithTag("VisibilityPrefab"); // Assuming you've tagged the instantiated prefabs

        foreach (GameObject prefab in visiblePrefabs)
        {
            bool isStillVisible = false;

            foreach (Collider collider in colliders)
            {
                if (collider.TryGetComponent<ItemVisibilityIcon>(out ItemVisibilityIcon visibilityIcon) &&
                    visibilityIcon.VisibilityPrefab == prefab)
                {
                    isStillVisible = true;
                    break;
                }
            }

            // If the prefab is not associated with any collider, destroy it
            if (!isStillVisible)
            {
                //Destroy(prefab);
                StartCoroutine(DestroyAfterSecondsForCheckForOutOfRangePickups(prefab));
            }
        }
    }

    IEnumerator DestroyAfterSeconds(GameObject itemVisibilityGO, ItemVisibilityIcon itemVisibilityIcon)
    {
        itemVisibilityIcon.VisibilityPrefab.GetComponent<Animator>().SetBool("FadeIn", false);
        yield return new WaitForSeconds(0.15f);


        Destroy(itemVisibilityGO);
        itemVisibilityIcon.VisibilityPrefab = null;
    }

    IEnumerator DestroyAfterSecondsForCheckForOutOfRangePickups(GameObject itemVisibilityGO)
    {
        itemVisibilityGO.GetComponent<Animator>().SetBool("FadeIn", false);
        yield return new WaitForSeconds(0.15f);
        Destroy(itemVisibilityGO);

    }

    private bool IsClearLineOfSight(Vector3 targetPosition, Collider itemCollider)
    {
        //RaycastHit hit;
        Vector3 dirToTarget = (targetPosition - _camera.transform.position).normalized;
        float distToTarget = Vector3.Distance(_camera.transform.position, targetPosition);
        if (!Physics.Raycast(_camera.transform.position, dirToTarget, distToTarget, obstacleLayer, QueryTriggerInteraction.Ignore))
        {
            return true;
        }
        else
        {
            return false;
        }
    }
}