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

/// <summary>
/// 
/// </summary>
public class UI_ScrollFlow_Item : MonoBehaviour
{
    /// <summary>
    /// 
    /// </summary>
    private UI_ScrollFlow parent;

    /// <summary>
    /// 
    /// </summary>
    [HideInInspector]
    public RectTransform rect;
 
    /// <summary>
    /// 
    /// </summary>
    public List<Image> imgList = new List<Image>();

    /// <summary>
    /// 
    /// </summary>
    public List<Text> txtList = new List<Text>();

    /// <summary>
    /// 
    /// </summary>
    public float v = 0;

    /// <summary>
    /// 
    /// </summary>
    private Vector3 p, s;

    /// <summary>
    /// 缩放值
    /// </summary>
    public float sv;

    /// <summary>
    /// 
    /// </summary>
    private Color color;

    /// <summary>
    /// 
    /// </summary>
    public int _index;
   
    /// <summary>
    /// 元素列表优化对象
    /// </summary>
    public UI_ScrollFlow ScrollFlowParent
    {
        set
        {
            parent = value;
        }
    }

    /// <summary>
    ///  拖拽到指定位置
    ///  将子对象,指定到时间轴的某个点上.
    /// </summary>
    /// <param name="value"></param>
    public void Drag(float value)
    {
        //// Debug.LogError("Item drag::" + value + "  curV:::" + v);
        v += value;
        Refresh();

        if (Index == 0 && v > parent.startValue)
        {
            parent.OnReceiveUpdateState(true, this);

            return;
        }

        if (Index == parent.mDataCount - 1 && v < parent.startValue)
        {
            parent.OnReceiveUpdateState(true, this);

            return;
        }

        float abs = Mathf.Abs(0.5f - v);
        if (abs < 0.05f)
        {
            parent.OnReceiveUpdateState(true, this);
        }
        else
        {
            parent.OnReceiveUpdateState(false, this);
        }

    }
      
    /////// <summary>
    /////// 更改 显示的绘制顺序
    /////// </summary>
    /////// <param name="v"></param>
    ////public int ResetSiblingIndex()
    ////{
    ////    int tempIndex = -1;
   
    ////    if (Index == parent.CurSelectElementIndex)
    ////    {
    ////        tempIndex = parent.mDataCount - 1;
    ////    }
    ////    else
    ////    {
    ////        if (Index < parent.CurSelectElementIndex)
    ////        {
    ////            tempIndex = Index;
    ////        }
    ////        else if (Index > parent.CurSelectElementIndex)
    ////        {
    ////            tempIndex = parent.mDataCount - (Index + 1) - parent.CurSelectElementIndex;
    ////        }
    ////        else
    ////        {
    ////        }
    ////    }
    ////    //// Debug.LogError("获得卡牌绘制的顺序!! 卡牌：：" + Index + " 绘制顺序：：" + tempIndex);
    ////    return tempIndex;
    ////}

    /// <summary>
    /// 指的是刷新,
    /// 该子对象在时间轴上
    /// 对应的位置等信息
    /// </summary>
    public void Refresh()
    {
        if (rect == null)
        {
            rect = GetComponent<RectTransform>();
        }
        p = rect.localPosition;
        p.x = parent.GetPositionX(v, _index);
     
        rect.localPosition = p;

        for (int i = 0; i < imgList.Count; i++)
        {
            imgList[i].color = new Color(imgList[i].color.r, imgList[i].color.g, imgList[i].color.b, color.a); ;
        }
        for (int i = 0; i < txtList.Count; i++)
        {
            txtList[i].color = new Color(txtList[i].color.r, txtList[i].color.g, txtList[i].color.b, color.a);
        }
        sv = parent.GetScale(v);
        s.x = 1;
        s.y = sv;
        s.z = 1;
        rect.localScale = s;
    }


    /// <summary>
    /// 数据索引
    /// </summary>
    public int Index
    {
        get
        {
            return _index;
        }

        set
        {
            _index = value;
            if (_index < 0)
            {
                ResetDrag();
            }

            if (parent.onInitializeItem != null && _index >= 0)
            {
                parent.onInitializeItem(gameObject, _index);
            }
        }
    }

    /// <summary>
    /// 
    /// </summary>
    private void ResetDrag()
    {
        v = 0;
        Refresh();
        this.gameObject.SetActive(false);
    }
}