using System.Collections.Generic;
using UnityEngine;

public class WallHider : MonoBehaviour
{
    public Transform lastWall;

    List<Transform> walls = new List<Transform>();

    float directionThreshold = 0;

    public void CheckIfCameraIsBehindWall()
    {
        if (walls.Count <= 0)
        {
            for (int i = 0; i < _G.NW; i++)
            {
                string wallName = "w" + (i + 1).ToString();
                Transform wall = SceneModeManager.GetObjectInRoom(wallName, true);
                if (wall != null)
                {
                    walls.Add(wall.transform);
                }
            }
        }

        float currentClosestDotToWall = 0;
        Transform currentWall = null;
        if (walls.Count > 0)
        {
            // Go through all the wall in the walls list 
            foreach (Transform wall in walls)
            {
                if(wall == null) { walls.Clear(); return; }

                //if (wallThatCameraIsBehind == wall) { Debug.Log($"SAME WALL{wall} "); continue; }
                Vector3 wallToCamera = transform.position - wall.position;

                //In normal circumstances, wallToCamera should not be negative, but our wall are inverted. 
                float dotProduct = Vector3.Dot(wallToCamera.normalized, wall.forward);

                // if dot product is negative, camera is behind wall.

                if (dotProduct > 0) // derriere le mur 
                {
                    Vector3 cameraDirection = transform.forward;
                    cameraDirection.y = 0;
                    float dotBetweenCameraAndWall = Vector3.Dot(cameraDirection.normalized, -wall.forward);
                    if (dotBetweenCameraAndWall > directionThreshold) // regarde dans la meme direction 
                    {
                        float differenceA = Mathf.Abs(1.0f - currentClosestDotToWall);
                        float differenceB = Mathf.Abs(1.0f - dotBetweenCameraAndWall);

                        if(differenceA > differenceB)
                        {
                            currentClosestDotToWall = dotBetweenCameraAndWall;
                            currentWall = wall; 
                        }
                        
                    }
                }
            }

            //unhide all object on wall before getting new wall
            if (lastWall != null && currentWall != lastWall)
            {
                ToggleObjectsOnSelectedWall(lastWall, true);
            }
            lastWall = currentWall;
            //hide object on new wall
            ToggleObjectsOnSelectedWall(currentWall, false);
        }

    }

    private void ToggleObjectsOnSelectedWall(Transform wall, bool toggle)
    {
        if (wall == null) return;

        Transform scene = SceneModeManager.Scene;
        if (scene.childCount != 0)
        {
            foreach (Transform child in scene)
            {
                if (child.TryGetComponent<MoveObject>(out MoveObject moveObject))
                {
                    if (moveObject.AttachedTo == wall)
                    {
                        //HideCommand hide = new HideCommand(child.name, toggle);
                        //hide.Execute();
                        CameraAround.SetObjectVisibility(moveObject.gameObject, toggle);
                    }
                }
            }
        }
    }
}