import { instantiate, Prefab ,Node, isValid} from "cc";

export default class NodePools{

    list:Node[]=[];
    private _insNode:Node | Prefab;
    constructor(insNode:Node | Prefab,preCount:number = 8){
        this._insNode = insNode;
        for (let i = 0; i < preCount; i++) {
            this.list.push(instantiate(insNode) as Node);
        }
    }

    get(parent:Node){
        let tNode:Node = null;
        if(this.list.length>0){
            tNode =  this.list.pop();
        }else{
            tNode = instantiate(this._insNode) as Node;
        }
        if(tNode.parent != parent){tNode.setParent(parent);}
        return tNode;
    }

    put(tNode:Node){
        tNode.removeFromParent();
        this.list.push(tNode);
    }

    clear(){
        for (let i = 0; i < this.list.length; i++) {
            const tNode = this.list[i];
            if(isValid(tNode)){
                tNode.destroy();
            }
        }
        this.list.length = 0;
    }


}