using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
using UnityEngine.EventSystems;

public class SelectionController : Singleton<SelectionController>
{
    [SerializeField]
    private List<SelectObject> selections;


    [SerializeField]
    private Ray ray;
    private RaycastHit hit;

    private int layerMask;

    private Vector3 hitPos;
    public Vector3 HitPos { get { return hitPos; } }

    void Start()
    {
        layerMask = 1 << LayerMask.NameToLayer("Train");
    }

    void Update()
    {
        ray = Camera.main.ScreenPointToRay(Input.mousePosition);

        if (Input.GetMouseButtonDown(1))
        {
            if (!EventSystem.current.IsPointerOverGameObject() && Physics.Raycast(ray, out hit, 1000f,layerMask))
            {
                // Debug.Log("Hit Green " + hit.collider.gameObject.name);
                hitPos = hit.point;
                SelectObject selectObject = hit.collider.GetComponent<SelectObject>();
                AddSelectObject(selectObject, hitPos);

                


            }
          
        }
        else if(Input.GetMouseButtonUp(1)) 
        {
            ClearSelectObject();
        }
    }



    void AddSelectObject(SelectObject selectObject, Vector3 hitPos)
    {
        ClearSelectObject();

        selectObject.Select();
        if (!selections.Contains(selectObject))
        {
            selections.Add(selectObject);
        }
    }

    void ClearSelectObject()
    {
        for (int i = 0; i < selections.Count; i++)
        {
            selections[i].UnSelect();
        }
    }
}