using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
using UnityEngine.Events;
using UnityEngine.UI;
public class TouchArea : MonoBehaviour ,IPointerDownHandler,IDragHandler,IPointerExitHandler, IPointerUpHandler
{
    [HideInInspector]
    public Image img;

    public bool MouseOnly = false;
    [System.Serializable]
    public class OnPointerDownEvent : UnityEvent<PointerEventData> { };
    public OnPointerDownEvent PointerDown = new OnPointerDownEvent();
    [System.Serializable]
    public class OnPointerDragEvent : UnityEvent<PointerEventData> { };
    public OnPointerDragEvent PointerDrag = new OnPointerDragEvent();


    [System.Serializable]
    public class OnPointerUpEvent : UnityEvent<PointerEventData> { };
    public OnPointerUpEvent PointerUp = new OnPointerUpEvent();


    [System.Serializable]
    public class OnPointerExitEvent : UnityEvent<PointerEventData> { };
    public OnPointerExitEvent PointerExit = new OnPointerExitEvent();

    private void Awake()
    {
        img = GetComponent<Image>();
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        if (PointerDown == null)
            return;
        if (skip_on_mouse_only(eventData))
            return;
        PointerDown.Invoke(eventData);
    }

    public void OnDrag(PointerEventData eventData)
    {
        if (PointerDrag == null)
            return;
        if (skip_on_mouse_only(eventData))
            return;
        PointerDrag.Invoke(eventData);
    }
    public void OnPointerUp(PointerEventData eventData)
    {
        if (PointerUp == null)
            return;
        if (skip_on_mouse_only(eventData))
            return;
        PointerUp.Invoke(eventData);
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        if (PointerExit == null)
            return;
        if (skip_on_mouse_only(eventData))
            return;

        PointerExit.Invoke(eventData);
    }
    private bool skip_on_mouse_only(PointerEventData eventData)
    {
        return MouseOnly && eventData.pointerId != -1;
    }
}