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


public class UIDragDropBehaviour : MonoBehaviour, IPointerDownHandler, IPointerUpHandler, IPointerExitHandler, IPointerEnterHandler
{
    public static bool draging = false;
    public static int dragData = 0;

    [HideInInspector] public int data;

    const float dragDelay = 0.2f;

    bool m_AllowDragDrop = true;
    bool m_OnPress = false;
    bool m_AllowClick = false;
    float m_Time = 0.0f;

    public event Action<int> onClick;

    public void Init(int data)
    {
        this.data = data;
    }

    public void SetDragDropState(bool allow)
    {
        m_AllowDragDrop = allow;
    }

    public void OnPointerDown(PointerEventData eventData)
    {
        draging = false;
        m_AllowClick = true;
        m_Time = 0f;
        if (!m_AllowDragDrop)
        {
            return;
        }
        m_OnPress = true;
    }

    public void OnPointerEnter(PointerEventData eventData)
    {
        m_AllowClick = true;
    }

    public void OnPointerExit(PointerEventData eventData)
    {
        m_AllowClick = false;
    }

    public void OnPointerUp(PointerEventData eventData)
    {
        var position = Input.mousePosition;
        if (!draging && m_AllowClick)
        {
            if (onClick != null)
            {
                onClick(data);
            }
        }
        m_OnPress = false;
    }

    private void LateUpdate()
    {
        if (m_OnPress && !draging)
        {
            m_Time += Time.deltaTime;
            if (m_Time > dragDelay)
            {
                dragData = data;
                draging = true;
                m_Time = 0;
                m_OnPress = false;
            }
        }
    }
}