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

/// <summary>
/// 针对UIWidget UIGeometry 数据buffer缓存
/// </summary>
public static class CachedGeometries
{
    #region//私有变量
    //UV
    private static Dictionary<int, BetterList<BetterList<Vector2>>> cachedListsOfVector2List = new Dictionary<int, BetterList<BetterList<Vector2>>>();
    //顶点
    private static Dictionary<int, BetterList<BetterList<Vector3>>> cachedListsOfVector3List = new Dictionary<int, BetterList<BetterList<Vector3>>>();
    //颜色
    private static Dictionary<int, BetterList<BetterList<Color32>>> cachedListsOfColorList = new Dictionary<int, BetterList<BetterList<Color32>>>();
    //总缓存大小
    private static int allCacheSize = 0;
    //未使用的缓存大小
    private static int unUseCacheSize = 0;
    #endregion

    #region//公有函数
    public static void Free(BetterList<Vector3> verts)
    {
        Free(cachedListsOfVector3List, verts, 12);
    }
    public static void Free(BetterList<Vector2> verts)
    {
        Free(cachedListsOfVector2List, verts, 8);
    }
    public static void Free(BetterList<Color32> cols)
    {
        Free(cachedListsOfColorList, cols, 16);
    }
    public static void Get(int count, ref BetterList<Vector3> verts)
    {
        Get(count, cachedListsOfVector3List, ref verts, 12);
    }
    public static void Get(int count, ref BetterList<Vector2> verts)
    {
        Get(count, cachedListsOfVector2List, ref verts, 8);
    }
    public static void Get(int count, ref BetterList<Color32> cols)
    {
        Get(count, cachedListsOfColorList, ref cols, 16);
    }

    public static void PrintInfo()
    {
        Debug.LogErrorFormat("NGUI Cacahe Info：Used {0}, Unused {1}, AllCache {2}", allCacheSize - unUseCacheSize, unUseCacheSize, allCacheSize);
    }
    #endregion

    #region//私有函数
    private static int FormatCount(int vecCount)
    {
        if (vecCount > 0 && vecCount % 32 == 0)
        {
            return vecCount;
        }
        else
        {
            return (vecCount / 32 + 1) * 32;
        }
    }

    private static void Free<T>(Dictionary<int, BetterList<BetterList<T>>> cache, BetterList<T> source, int size)
    {
        if (source == null || source.buffer == null)
            return;
        var count = FormatCount(source.buffer.Length);
        BetterList<BetterList<T>> list = null;
        if (!cache.TryGetValue(count, out list))
        {
            list = new BetterList<BetterList<T>>();
            cache.Add(count, list);
        }
        unUseCacheSize += count * size;
        list.Add(source);
    }

    private static void Get<T>(int vertexCount, Dictionary<int, BetterList<BetterList<T>>> cache, ref BetterList<T> source, int size)
    {
        var count = FormatCount(vertexCount);
        BetterList<BetterList<T>> list = null;
        if (cache.TryGetValue(count, out list) && list.size > 0)
        {
            source = list[list.size - 1];
            source.Clear();
            list.RemoveAt(list.size - 1);
            unUseCacheSize -= count * size;
        }
        else
        {
            allCacheSize += count * size;
            source = new BetterList<T>(count);
        }
    }
    #endregion
}