using UnityEngine;
using UnityEngine.UI;
using UnityEngine.EventSystems;
using System.Collections;
using System;
using GCGame.Table;

public class FactionSkillBarItem : UIItemSelect, IDropHandler, IBeginDragHandler, IEndDragHandler, IDragHandler
{

    public Image _SkillIcon;

    private int _SkillItemIdx;
    public int SkillItemIdx
    {
        get
        {
            return _SkillItemIdx;
        }
    }

    private int _OwnSkillIdx;
    public int OwnSkillIdx
    {
        get
        {
            return _OwnSkillIdx;
        }
        set
        {
            _OwnSkillIdx = value;
        }
    }

    public override void Show(Hashtable hash)
    {
        base.Show();

        var _Page = (int)hash["InitObj"];
    }

    public void InitSkillBar(int skillIdx, int skillItemIdx)
    {
        _SkillItemIdx = skillItemIdx;
        _OwnSkillIdx = skillIdx;

        _SkillIcon.gameObject.SetActive(false);
        if (Singleton<ObjManager>.GetInstance().MainPlayer == null)
            return;

        if (Singleton<ObjManager>.GetInstance().MainPlayer.OwnSkillInfo.Length <= skillIdx || skillIdx < 0)
            return;

        Tab_SkillEx skillEx = Singleton<ObjManager>.GetInstance().MainPlayer.OwnSkillInfo[skillIdx].SkillExTable;
        if (skillEx == null)
            return;

        Tab_SkillBase skillBase = Singleton<ObjManager>.GetInstance().MainPlayer.OwnSkillInfo[skillIdx].SkillBaseTable;
        if (skillEx == null)
            return;

        _SkillIcon.gameObject.SetActive(true);
        LoadAssetBundle.Instance.SetImageSprite(_SkillIcon, skillBase.Icon);
    }

    #region event

    private static bool _HasDropSucess = false;

    public void OnBeginDrag(PointerEventData eventData)
    {

        if (!FactionSkillChangeRootCtr.Instance)
            return;
        if (_OwnSkillIdx == -1)  //当前拖拽的目标为空
            return;
        if (FactionSkillChangeRootCtr.Instance._DragSkillOwnIdx == 12 || FactionSkillChangeRootCtr.Instance._DragSkillOwnIdx == 13)
            return;

        _HasDropSucess = false;
        FactionSkillChangeRootCtr.Instance._DragSkillOwnIdx = _OwnSkillIdx;
        FactionSkillChangeRootCtr.Instance._DragSkillBar = this;
        FactionSkillChangeRootCtr.Instance._DragIcon.sprite = _SkillIcon.sprite;
        FactionSkillChangeRootCtr.Instance._DragIcon.gameObject.SetActive(true);
    }

    public void OnDrag(PointerEventData eventData)
    {
        if (FactionSkillChangeRootCtr.Instance._DragIcon.isActiveAndEnabled)
            SetDraggedPosition(eventData);
    }

    private void SetDraggedPosition(PointerEventData eventData)
    {

        var rt = FactionSkillChangeRootCtr.Instance._DragIcon.rectTransform;
        Vector3 globalMousePos;
        if (RectTransformUtility.ScreenPointToWorldPointInRectangle(FactionSkillChangeRootCtr.Instance.GetComponent<RectTransform>(), eventData.position, eventData.pressEventCamera, out globalMousePos))
        {
            rt.position = globalMousePos;
        }
    }

    public void OnEndDrag(PointerEventData eventData)
    {
        FactionSkillChangeRootCtr.Instance._DragSkillOwnIdx = -1;
        FactionSkillChangeRootCtr.Instance._DragIcon.sprite = null;
        FactionSkillChangeRootCtr.Instance._DragIcon.gameObject.SetActive(false);
        FactionSkillChangeRootCtr.Instance._DragSkillBar = null;

        if (!_HasDropSucess)
        {
            _SkillIcon.gameObject.SetActive(false);
            _OwnSkillIdx = -1;

            FactionSkillChangeRootCtr.Instance.ClearSkillBar(_SkillItemIdx);
        }
    }

    public void OnDrop(PointerEventData data)
    {
        if (FactionSkillChangeRootCtr.Instance._DragSkillBar == null)  //从技能栏拖拽下来是没有OnBeginDrag接口的。
        {
            if (FactionSkillChangeRootCtr.Instance._DragSkillOwnIdx < 0)
            {
                return;
            }

            _SkillIcon.gameObject.SetActive(true);
            _SkillIcon.sprite = FactionSkillChangeRootCtr.Instance._DragIcon.sprite;

            _OwnSkillIdx = FactionSkillChangeRootCtr.Instance._DragSkillOwnIdx;
            FactionSkillChangeRootCtr.Instance.ChangeSkillBar(_SkillItemIdx);
        }
        else
        {
            var tempSprite = _SkillIcon.sprite;
            _SkillIcon.sprite = FactionSkillChangeRootCtr.Instance._DragSkillBar._SkillIcon.sprite;
            FactionSkillChangeRootCtr.Instance._DragSkillBar._SkillIcon.sprite = tempSprite;
            FactionSkillChangeRootCtr.Instance.ExChangeSkillBar(_SkillItemIdx);

            var tempSkillIdx = _OwnSkillIdx;
            _OwnSkillIdx = FactionSkillChangeRootCtr.Instance._DragSkillBar.OwnSkillIdx;
            FactionSkillChangeRootCtr.Instance._DragSkillBar.OwnSkillIdx = tempSkillIdx;

            if (FactionSkillChangeRootCtr.Instance._DragSkillBar.OwnSkillIdx < 0)
            {
                FactionSkillChangeRootCtr.Instance._DragSkillBar._SkillIcon.gameObject.SetActive(false);
            }
            else
            {
                FactionSkillChangeRootCtr.Instance._DragSkillBar._SkillIcon.gameObject.SetActive(true);
            }

            if (OwnSkillIdx < 0)
            {
                _SkillIcon.gameObject.SetActive(false);
            }
            else
            {
                _SkillIcon.gameObject.SetActive(true);
            }


        }

        _HasDropSucess = true;

    }
    #endregion
}