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

public class Drag : MonoBehaviour, IBeginDragHandler, IDragHandler, IEndDragHandler
{
    protected Vector3 mousePosition;
    protected Vector2 a; // Vector2 deltaPosition
    public string typeDrag = null;
    public float dragMin, dragMax;
    public bool clamp=false;

    [HideInInspector] public Vector2 dd;//для передачи в connection
    [HideInInspector] public bool _delta = false;//для передачи в connection

    private void Start()
    {
        dd = new Vector2(transform.localPosition.x, transform.localPosition.y);
    }
    public virtual void OnBeginDrag(PointerEventData data)
    {
        calculationBegin();  
    }
    public virtual void OnDrag(PointerEventData data)
    {
        calculationDrag();
                  
    }

    public void OnEndDrag(PointerEventData data)
    {
        dd = new Vector2(transform.localPosition.x, transform.localPosition.y);
        if (typeDrag == "x" && (dd.x == dragMin || dd.x == dragMax))
        {
            _delta = true;
        }
        else if (typeDrag == "y" && (dd.y == dragMin || dd.y == dragMax))
        {
            _delta = true;
        }
        else
        {
            _delta = false;
        }
    }
    public void calculationBegin()
    {
        a = new Vector2(Input.mousePosition.x - transform.localPosition.x, Input.mousePosition.y - transform.localPosition.y);
    }
    public void calculationDrag()
    {
        mousePosition = Input.mousePosition;
        Vector2 q = new Vector2(mousePosition.x, mousePosition.y);
        Vector3 b = new Vector3(q.x - a.x, q.y - a.y, transform.localPosition.z);

        if (typeDrag == "x")
        {
            b.x = (clamp) ? Mathf.Clamp(b.x, dragMin, dragMax) : b.x;
            transform.localPosition = new Vector3(b.x, transform.localPosition.y, transform.localPosition.z);
        }
        else if (typeDrag == "y")
        {
            b.y = (clamp) ? Mathf.Clamp(b.y, dragMin, dragMax) : b.y;
            transform.localPosition = new Vector3(transform.localPosition.x, b.y, transform.localPosition.z);
        }
        else
        {
            transform.localPosition = b;
        }
    }
}