using UnityEngine;
using System.Collections;
  using System.Collections.Generic;

public class UI_Star : MonoBehaviour
{
    private GameObject mPrefab;

    /// <summary>
    /// 行数
    /// </summary>
    public int mRow;

    /// <summary>
    /// 列数
    /// </summary>
    public int mColum;

    /// <summary>
    /// 
    /// </summary>
    public int mRowSpace;

    /// <summary>
    /// 
    /// </summary>
    public int mColumnSpace;

    /// <summary>
    /// 对其方式
    /// </summary>
    public StarDirection mDirection = StarDirection.RightAndUp;

    /// <summary>
    /// 设置好星星的显示规则
    /// 几行几列 行间距 对其方式啊什么的
    /// </summary>
    public void Init(int row, int col, int rspace, int colSpace, StarDirection direction)
    {
        mRow = row;
        mColum = col;
        mRowSpace = rspace;
        mColumnSpace = colSpace;
        mDirection = direction;

        mPrefab = this.transform.Find("prefab").gameObject;
        mPrefab.SetActive(false);
    }

    /// <summary>
    /// 
    /// </summary>
    private int _curStarNum = 0;

    /// <summary>
    /// 设置
    /// </summary>
    public int StarNum
    {
        get
        {
            return _curStarNum;
        }
        set
        {
            if (_curStarNum != value)
            {
                _curStarNum = value;
                onStarNumChanged();
            }
        }
    }

    private List<GameObject> elements = new List<GameObject>();
    /// <summary>
    ///  显示星星啦啦啦 
    /// </summary>
    private void onStarNumChanged()
    {
        foreach (GameObject ele in elements)
        {
            Destroy(ele);
        }
        elements.Clear();

        RectTransform rect = mPrefab.GetComponent<RectTransform>();
        float prefabWidth = rect.sizeDelta.x;
        float prefabHeight = rect.sizeDelta.y;

        for (int i = 0; i < StarNum; i++)
        {
            GameObject card = (GameObject)Instantiate(mPrefab);
            card.name = i.ToString();
            card.SetActive(true);            
            card.transform.SetParent(this.transform); 
            card.transform.localScale = Vector3.one;
            Vector3 destPos = Vector3.zero;


            switch (mDirection)
            {
                case StarDirection.RightAndUp:
                    destPos.x = (i % mColum) * (prefabWidth + mColumnSpace);
                    destPos.y = -(i / mColum) * (prefabHeight + mRowSpace);

                    break;
                case StarDirection.RightAndDown:
                    destPos.x = (i % mColum) * prefabWidth + i * mColumnSpace;
                    destPos.y = (i / mColum) * (prefabHeight + mRowSpace);
                    break;
                case StarDirection.LeftAndDown:
                    destPos.x = -(i % mColum) * (prefabWidth + mColumnSpace);
                    destPos.y = -(i / mColum) * (prefabHeight + mRowSpace);

                    break;
                case StarDirection.LeftAndUP:
                    destPos.x = -(i % mColum) * prefabWidth + i * mColumnSpace;
                    destPos.y = (i / mColum) * (prefabHeight + mRowSpace);
                    break;

            }
            card.transform.localPosition = destPos;
            elements.Add(card);
        }
    }

    public Vector2 GetSizeDelta()
    {
        RectTransform rect = mPrefab.GetComponent<RectTransform>();
        float prefabWidth = rect.sizeDelta.x;
        float prefabHeight = rect.sizeDelta.y;
        float x = 0, y = 0;

        if (StarNum % mColum == 0)
        {
            x = mColum * (prefabWidth + mColumnSpace);
        }
        else
        {
            x = (StarNum % mColum) * (prefabWidth + mColumnSpace);
        }

        y = Mathf.CeilToInt(StarNum / mColum) * (prefabHeight + mRowSpace);

        return new Vector2(x, y);
    }
}

public enum StarDirection
{
    /// <summary>
    /// 左下角对齐，向右向上发展
    /// </summary>
    RightAndUp,
    /// <summary>
    /// 左上角对齐，向右向下发展
    /// </summary>
    RightAndDown,

    /// <summary>
    /// 右上角角对齐，向左向下发展
    /// </summary>
    LeftAndDown,

    /// <summary>
    /// 右下角角对齐，向左向上发展
    /// </summary>
    LeftAndUP,
}