import {GameUtils} from './GameUtils';
export default class SPromise{
    private _waitingList:((...arg) => void)[] = [];
    private _resolvedArguments:any[];
    private _isResolved:boolean;

    constructor(){
        this.reset();
    }

    resolve(...args){
        if(this._isResolved)
        {
            console.error('SPromise::resolve 已经被resolve过了');
            return;
        }
        this._resolvedArguments = args;
        for(let fuc of this._waitingList)
        {
            fuc.apply(null, this._resolvedArguments);
        }
        this._waitingList.length = 0;
        this._isResolved = true;
    }

    then(fuc:(...arg) => void){
        if(this._isResolved)
        {
            fuc.apply(null, this._resolvedArguments);
        }
        else
        {
            GameUtils.pushElemToAryIfNotIn(fuc, this._waitingList);
        }
    }

    reset(){
        this._isResolved = false;
    }
}