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

namespace ZXKFramework
{
    public class MouseMoveObj : MonoBehaviour
    {
        public Action<GameObject> down;
        public Action<GameObject> up;
        public bool isMove = false;

        private Vector3 screenPoint;
        private Vector3 offset;


        public LayerMask layerMask;

        GameObject go;

        void Update()
        {
            if (Input.GetMouseButtonDown(0) && isMove/*&& UnityEngine.EventSystems.EventSystem.current.IsPointerOverGameObject()*/)
            {
                if (!EventSystem.current.IsPointerOverGameObject())
                {
                    RaycastHit hit;
                    Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);

                    if (Physics.Raycast(ray, out hit))
                    {
                        if (hit.collider.name.Equals(gameObject.name))
                        {

                            go = gameObject;
                            screenPoint = Camera.main.WorldToScreenPoint(transform.position);
                            offset = gameObject.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z));
                            down?.Invoke(gameObject);
                        }
                    }
                }
            }
            if (Input.GetMouseButton(0) && isMove && go != null/*&& UnityEngine.EventSystems.EventSystem.current.IsPointerOverGameObject()*/)
            {
                Vector3 curScreenPoint = new(Input.mousePosition.x, Input.mousePosition.y, screenPoint.z);
                Vector3 curWorldPoint = Camera.main.ScreenToWorldPoint(curScreenPoint);
                Vector3 p = curWorldPoint + offset;
                transform.position = p;
            }
            if (Input.GetMouseButtonUp(0) && isMove && go != null)
            {
                up?.Invoke(gameObject);
                go = null;
            }
        }


    }
}