import { Asset, AssetManager, Prefab, resources, SpriteFrame, TiledMapAsset } from "cc";

class ResourcesMgr{

    static instance: ResourcesMgr = null;

    private _spriteFrame: Map<string,SpriteFrame> = new Map();
    private _prefab: Map<string, Prefab> = new Map();
    private _tmxAsset: Map<number,TiledMapAsset> = new Map();
    async loadAllRes(path: string, onProgress:((finish: number,total: number, item: AssetManager.RequestItem)=>void) = null){
        //下载resources文件夹下的所有资源
        //异步函数
        const assets: Asset[] = await new Promise<Asset[]>((value, reject)=>{
            resources.loadDir(path, onProgress, (err:Error,assets: Asset[])=>{
                //完成回调 assets就是那些所有资源的数组
                if(err){
                    reject(err);
                }
                else{
                    value(assets);
                }
                
            })
        })
       //遍历所有资源 分门别类存储到对应的容器中
       for(const asset of assets){
    
       }
    }

    addRes(name: string | string, asset: Asset){
        if(asset instanceof SpriteFrame){
            this._spriteFrame.set(String(name), asset);
        }
        if(asset instanceof Prefab){
            this._prefab.set(String(name), asset);
        }
        if(asset instanceof TiledMapAsset){
            this._tmxAsset.set(Number(name), asset)
        }
    }

    getSpriteFrame(name: string): SpriteFrame{
        return this._spriteFrame.get(name);
    }

    getPrefab(name: string): Prefab{
        return this._prefab.get(name);
    }
}

export const resMgr: ResourcesMgr = ResourcesMgr.instance = new ResourcesMgr();