using UnityEngine;
using System.Collections;
using UnityEngine.UI;
using System;

public class MyPingTu : MonoBehaviour
{
    public GameObject end;
    ItemImg[] itemImg;
    Sprite[] UIShowImage;
    int length = 0;
    int sqrt = 0;
    void Start()
    {
        var RSLoadAllImages = Resources.LoadAll("Texture1");
        length = transform.childCount;
        sqrt = (int)Mathf.Sqrt(length);
        Debug.Log("sqrt==>" + sqrt);
        Debug.Log("length==>" + length);
        //childLength-1——其中某一张为空白，即后下角为空白
        UIShowImage = new Sprite[length];
        for (int i = 0; i < length; i++)
        {
            UIShowImage[i] = (Sprite)RSLoadAllImages[i + 1];
        }
        //初始化图片的id，col，row
        InitItemImg(length);
        //打乱图片
       Shuffle(UIShowImage);
        InitShow();
    }
   
    /// <summary>
    /// 数组打乱
    /// </summary>
    T[] Shuffle<T>(T[] Array)
    {
        for (int i = Array.Length-3; i < Array.Length-1; i++)
        {
            T temp = Array[i];
            int randomIndex = i+1;//UnityEngine.Random.Range(Array.Length-2, Array.Length-1);
            Array[i] = Array[randomIndex];
            Array[randomIndex] = temp;
        }

        /*
        for (int i = 0; i < Array.Length - 1; i++)
        {
            T temp = Array[i];
            int randomIndex = UnityEngine.Random.Range(0, Array.Length-1);
            Array[i] = Array[randomIndex];
            Array[randomIndex] = temp;
        }*/
        return Array;
    }

    /// <summary>
    /// 初始化图片id,col,row
    /// </summary>
    void InitItemImg(int count)
    {
        itemImg = new ItemImg[length];
        for (int i = 0; i < count; i++)
        {
            itemImg[i] = new ItemImg();
            itemImg[i]._id = i;
            itemImg[i]._col = i / sqrt;
            itemImg[i]._row = i % sqrt;
        }
    }

    void InitShow(bool isinit=false)
    {
        //初始化显示图片
        for (int i = 0; i < UIShowImage.Length; ++i)
        {
            var t = transform.GetChild(i);
            t.GetComponent<Image>().sprite = UIShowImage[i];
            //指定Sprite
            itemImg[i]._sprite = t.GetComponent<Image>().sprite;
            //指定Obj
            itemImg[i]._Obj = t.gameObject;
            var item = itemImg[i];
            if(!isinit)
            {

                itemImg[i]._Obj.GetComponent<Button>().onClick.AddListener(delegate () {
                    this.OnClickEvent(item);
                });
            }
        }
        itemImg[length - 1]._Obj.GetComponent<Image>().sprite = null;
        itemImg[length - 1]._sprite = null;
    }

    void OnClickEvent(ItemImg item)
    {
        if (canMovie(item))
        {
            var t = NoneImage();
            t._sprite = item._sprite;
            t._Obj.GetComponent<Image>().sprite = item._Obj.GetComponent<Image>().sprite;
            item._sprite = null;
            item._Obj.GetComponent<Image>().sprite = null;
        }
        if (Success())
        {
            end.SetActive(true);
            Debug.Log("胜利");
        }
    }

    /// <summary>
    /// 判断是否可以移动
    /// </summary>
    bool canMovie(ItemImg item)
    {
        if (item._sprite == null)
            return false;
        var t = NoneImage();

        if ((t._col == item._col - 1 && t._row == item._row) || (t._col == item._col + 1 && t._row == item._row) || (t._col == item._col && t._row == item._row + 1) || (t._col == item._col && t._row == item._row - 1))
        {
            return true;
        }
        else
        {
            return false;
        }
    }

    /// <summary>
    /// 获取空白图片
    /// </summary>
    ItemImg NoneImage()
    {
        for (int i = 0; i < length; i++)
        {
            if (itemImg[i]._sprite == null)
            {
                return itemImg[i];
            }
        }
        return null;
    }

    /// <summary>
    /// 判断胜利
    /// </summary>
    bool Success()
    {
        for (int i = 0; i < length - 1; i++)
        {
            if (itemImg[i]._Obj.GetComponent<Image>().sprite != null)
            {
                if (itemImg[i]._Obj.GetComponent<Image>().sprite.name != "Image_02_" + i.ToString())
                    return false;
            }
        }
        return true;
    }
    private void OnEnable()
    {    
    }
}

public class ItemImg
{
    public int _col;
    public int _row;
    public int _id;
    public GameObject _Obj;
    public Sprite _sprite;
}