using System.Collections;
using System.Collections.Generic;
using System.Linq;
using static MyFrameworkPure.CollectionsExtension;
using UnityEngine;
using UnityEngine.EventSystems;
using MyFrameworkPure;
using CommonScript;

public class MouseDragable : MonoBehaviour
{
    [SerializeField] private MouseButton mouseButton = MouseButton.Left;

    [SerializeField] private Collider[] attachColliders;//约束区域碰撞体

    [SerializeField] private bool limitToCollider;//是否将拖拽物体限制到碰撞体表面

    private float depth;
    private Vector3 lastRayCastPos;
    public bool only_z=false;
    // Start is called before the first frame update
    void Start()
    {
        EventTriggerListener.Get(gameObject).onBeginDrag_Data += OnBeginDrag;

        EventTriggerListener.Get(gameObject).onDrag_Data += OnDrag;
    }

    void OnBeginDrag(GameObject go,PointerEventData e)
    {
        if(!enabled)
            return;
        if(e.button != (PointerEventData.InputButton)mouseButton)
            return;
        if(!e.enterEventCamera)
            return;
        depth = e.enterEventCamera.WorldToScreenPoint(transform.position).z;
    }

    void OnDrag(GameObject go, PointerEventData e)
    {
        if(!enabled)
            return;
        if (e.button != (PointerEventData.InputButton)mouseButton)
            return;

        Vector3 mousePos = new Vector3(e.position.x,e.position.y,depth);
        //transform.position = e.pressEventCamera.ScreenToWorldPoint(mousePos);
        if (only_z == true)
        {
            transform.position = new Vector3(transform.position.x, e.pressEventCamera.ScreenToWorldPoint(mousePos).y, e.pressEventCamera.ScreenToWorldPoint(mousePos).z);
        }
        else {

            transform.position = e.pressEventCamera.ScreenToWorldPoint(mousePos);
        }

        if (!attachColliders.IsNullOrEmpty())
        {
            Ray ray = e.pressEventCamera.ScreenPointToRay(e.position);

            RaycastHit[] hits = Physics.RaycastAll(ray);
            RaycastHit hit = hits.FirstOrDefault(x => attachColliders.Contains(x.collider));
            if (hit.collider != null)
            {
               // transform.position = hit.point;
                //lastRayCastPos = hit.point;
                if (only_z == true)
                {
                    lastRayCastPos = new Vector3(transform.position.x, transform.position.y, transform.position.z);

                }
                else {

                    transform.position = hit.point;
                    lastRayCastPos = hit.point;

                }


                }
            else if (limitToCollider)
            {
                
                    transform.position = lastRayCastPos;
              
            }
          
        }
    }
}