3DTD/Assets/Scripts/PlacementSystem/CameraSlotClickDetect.cs

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

public class CameraSlotClickDetect : MonoBehaviour
{
    public Camera mainCamera;
    public LayerMask layerMask;
    public LayerMask selectLayer;

    private SlotManager PrevHoveredSlot;

    void Update()
    {
        if (Input.GetMouseButtonDown(0))
        {
            ShootClickRay();
        }

        ShootHoverRay();
    }

    void ShootClickRay()
    {
        Ray ray = mainCamera.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit;

        RaycastHit selectHit;
        if (Physics.Raycast(ray, out selectHit, Mathf.Infinity, selectLayer) && !GameManager.Instance.IsBuildMode)
        {
            var tower = selectHit.collider.gameObject.GetComponentInChildren<Tower>();
            if (tower != null)
            {
                GameManager.Instance.SelectedTower = tower;
            }
        }
        else if (Physics.Raycast(ray, out hit, Mathf.Infinity, layerMask))
        {
            var slotInfo = hit.collider.gameObject.GetComponentInParent<SlotManager>();
            slotInfo.OnClick();
            GameManager.Instance.SelectedTower = null;
        }
    }

    void ShootHoverRay()
    {
        Ray ray = mainCamera.ScreenPointToRay(Input.mousePosition);
        RaycastHit hit;

        if (Physics.Raycast(ray, out hit, Mathf.Infinity, layerMask))
        {
            var slotInfo = hit.collider.gameObject.GetComponentInParent<SlotManager>();

            if (PrevHoveredSlot != null && PrevHoveredSlot != slotInfo)
            {
                PrevHoveredSlot.OnUnHovered();
            }

            slotInfo.OnHovered();
            PrevHoveredSlot = slotInfo;
        }
        else
        {
            PrevHoveredSlot = null;
        }
    }
}