import { BinanceApiClient, ExchangeInfo, RateLimit, RateLimitType } from "binance-api-client";
import { isNullOrUndefined } from "util";
import * as jsonContext from "./../input.json";
import { Context } from "../models/Context";

export class ResourcesManager {

    private static _apiClient: BinanceApiClient;
    private static _context: Context;
    private static _exchangeInfo: ExchangeInfo;

    public static get apiClient(): BinanceApiClient {

        if( isNullOrUndefined( this._apiClient ) ) {

            this._apiClient = new BinanceApiClient(
                process.env.BINANCE_API_KEY,
                process.env.BINANCE_API_SECRET
            );

        }
        return this._apiClient;

    }

    public static get context(): Context {

        if( isNullOrUndefined( this._context ) ) {
            this._context = new Context( jsonContext );
        }
        return this._context;

    }

    public static async getRequestsLimit(): Promise< RateLimit > {

        if( isNullOrUndefined( this._exchangeInfo ) ) {
            this._exchangeInfo = await this.apiClient.getExchangeInfo();
        }
        return this._exchangeInfo.rateLimits.find( ( rateLimit: RateLimit ) => {
            return rateLimit.type === RateLimitType.REQUESTS;
        } );

    }



}