using System;
using System.Collections;
using System.Collections.Generic;
using UnityEngine;
using UnityEngine.EventSystems;
//============================================================
//支持中文，文件使用UTF-8编码
//@author	#AUTHOR#
//@create	#CREATEDATE#
//@company	#COMPANY#
//
//@description:
//============================================================

public class DragController : MonoBehaviour, IBeginDragHandler, IEndDragHandler, IDragHandler
{

    public DragTest1 oriObjectPrefab;
    private DragTest1 targetObject;
    private UPosItem currentUPosItem;

    public Func<bool> DragCondition;
    public Action<DragTest1> DragAction;

    public Action<DragTest1> BeginDragAction;
    public Action<DragTest1> EndDragAction;

    //public DragTest1 currentDevice;


    public UPosManger uPosManger;
    public DeviceManager deviceManager;

    public bool isSaveMode = false;



    // Start is called before the first frame update
    void Start()
    {
        BeginDragAction = (target) =>
        {
            target.gameObject.SetActive(true);
        };
        DragAction = (target) =>
        {
            //target.transform.position = Camera.main.GetComponent<Camera>().ScreenToWorldPoint(Input.mousePosition + new Vector3(0, 0, 5));
            OnRay(target.gameObject);
        };

    }
    public void OnBeginDrag(PointerEventData eventData)
    {
        if (!isSaveMode)
            targetObject = Instantiate(oriObjectPrefab);
        else
        {
            targetObject = oriObjectPrefab;
            targetObject.gameObject.SetActive(true);
        }
        //currentDevice = targetObject.GetComponent<DragTest1>();
        targetObject.transform.eulerAngles = oriObjectPrefab.transform.eulerAngles;
        targetObject.transform.localScale = oriObjectPrefab.transform.lossyScale;
        BeginDragAction?.Invoke(targetObject);
    }

    public void OnDrag(PointerEventData eventData)
    {
        if (DragCondition != null && DragCondition.Invoke())
        {
            DragAction?.Invoke(targetObject);
        }
        else if (DragCondition == null)
        {
            DragAction?.Invoke(targetObject);
        }
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        EndDragAction?.Invoke(targetObject);
        CountUPos();
        currentUPosItem = null;
        targetObject = null;

    }

    /// <summary>
    /// 计算U位数量
    /// </summary>
    private void CountUPos()
    {
        if (targetObject == null) return;
        if (currentUPosItem == null)
        {
            if (!isSaveMode)
                Destroy(targetObject.gameObject);
            else
                targetObject.gameObject.SetActive(false);
            return;
        }
        if (currentUPosItem.isOccupied)
        {
            if (!isSaveMode)
                Destroy(targetObject.gameObject);
            else
                targetObject.gameObject.SetActive(false);
            return;
        }
        int index = uPosManger.CountUPos(targetObject.volume, currentUPosItem.ID);
        //Debug.Log("index-------------" + index);
        if (!CountUPos(targetObject, index))
        {
            if (isSaveMode)
            {
                targetObject.gameObject.SetActive(false);
            }
            else
            {
                Destroy(targetObject.gameObject);

            }
        }
        else
        {
            if (isSaveMode)
            {
                deviceManager.SwitchStagingPanel(this.gameObject);
            }
        }
    }

    /// <summary>
    /// 自动生成设备
    /// </summary>
    /// <param name="dt"></param>
    /// <param name="index">机位号码，从0开始</param>
    public bool CountUPos(DragTest1 dt, int index)
    {
        if (index >= 0)
        {
            dt.transform.SetParent(uPosManger.uPosItems[index].transform);
            dt.transform.localPosition = new Vector3(0.25f, 0, -0.045f * dt.volume + 0.0225f);
            uPosManger.SetCurrentUPosIsOccupied(index, dt.volume, true);

            DeviceItem di;
            if (dt.gameObject.GetComponent<DeviceItem>() == null)
                di = dt.gameObject.AddComponent<DeviceItem>();
            else
                di = dt.GetComponent<DeviceItem>();
            if (di.gameObject.GetComponent<HighLight_VR>() == null)
                di.gameObject.AddComponent<HighLight_VR>();

            di.Init(deviceManager, index, dt.volume, oriObjectPrefab);
            deviceManager.SetDeviceItem(di);
            return true;
        }
        else
        {
            //Destroy(dt.gameObject);
            return false;
        }
    }



    private void OnRay(GameObject target)
    {
        currentUPosItem = null;
        target.transform.position = Camera.main.ScreenToWorldPoint(Input.mousePosition + new Vector3(0, 0, 2));
        Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
        RaycastHit hitInfo;
        if (Physics.Raycast(ray, out hitInfo, 100, 1 << 10))
        {
            if (hitInfo.collider != null && hitInfo.collider.GetComponent<UPosItem>())
            {
                currentUPosItem = hitInfo.collider.GetComponent<UPosItem>();
                if (!EventSystem.current.IsPointerOverGameObject())
                {
                    if (!currentUPosItem.isOccupied)
                    {
                        target.transform.position = hitInfo.point;

                    }
                }
            }
            else
            {
            }
        }
    }

}