using System;
using UnityEngine;

public class PlayerEntityMovement : MonoBehaviour
{
    //unsure if this should also move enemies but who knows!
    #region Statication

    public static PlayerEntityMovement instance;

    private void Awake()
    {
        if (instance != null && instance != this)
        {
            Destroy(gameObject);
            return;
        }
        instance = this;
    }

    #endregion
    [SerializeField] private Grid gameplayGrid;
    
    public Entity selectedEntity;
    public GameObject templateObject;
    public bool isMoving;

    private Vector3 mouseWorldPos;
    private Camera cam;

    private float debounceTime;
    [SerializeField] private float debounceDuration;

    private void Start()
    {
        cam = Camera.main;
    }

    private void Update()
    {
        mouseWorldPos = cam.ScreenToWorldPoint(Input.mousePosition);
        if (debounceTime > 0)
        {
            debounceTime -= Time.deltaTime;
        }
        if (isMoving)
        {
            templateObject.transform.position = gameplayGrid.GetCellCenterWorld(gameplayGrid.WorldToCell(mouseWorldPos));
            if (Input.GetMouseButtonDown(0) && debounceTime <= 0)
            {
                SelectLocation();
                isMoving = false;
            }
        }
    }

    public void SelectEntity(Entity entitySelected)
    {
        selectedEntity = entitySelected;
        isMoving = true;
        debounceTime = debounceDuration;
        CreateTemplate();
    }

    private void SelectLocation()
    {
        selectedEntity.transform.position = gameplayGrid.GetCellCenterWorld(gameplayGrid.WorldToCell(mouseWorldPos));
        templateObject.SetActive(false);
    }

    private void CreateTemplate()
    {
        templateObject.SetActive(true);
        templateObject.transform.position = gameplayGrid.GetCellCenterWorld(gameplayGrid.WorldToCell(mouseWorldPos));
    }
}