import { Candlestick, CandlestickInterval } from "binance-api-client";
import { TimeUtils } from "./TimeUtils";
import * as delay from "delay";
import * as Winston from "winston";
import { Configuration } from "../models/Configuration";
import { ResourcesManager } from "../singletons/ResourcesManager";

export class CandleUtils {

    public static async getDataSourceFromConfiguration( configuration: Configuration ): Promise< Candlestick[] > {

        let formattedStartTime: string = TimeUtils.formatStandard( configuration.startTime );
        let formattedEndTime: string = TimeUtils.formatStandard( configuration.endTime );
        Winston.info( `Fetching candles history from ${ formattedStartTime } to ${ formattedEndTime }` );

        let candlesHistory: Candlestick[] = [];

        let endTime: number = configuration.endTime.getTime();
        let startTime: number = configuration.startTime.getTime();
        let requestIndex: number = 0;
        do {

            if( requestIndex >= ( await ResourcesManager.getRequestsLimit() ).value ) {
                await delay( TimeUtils.requestsLimitToMilliseconds(
                    ( await ResourcesManager.getRequestsLimit() ).interval
                ) );
            }

            candlesHistory = candlesHistory.concat( await ResourcesManager.apiClient.getCandlesticks(
                configuration.symbol,
                CandlestickInterval[ configuration.responsiveness ],
                null,
                startTime
            ) );
            requestIndex++;
            startTime = candlesHistory[ candlesHistory.length - 1 ].closureTime.getTime() + 1;

        }
        while( startTime <= endTime );

        Winston.info( `Fetched ${ candlesHistory.length } candles in ${ requestIndex } request/s` );

        let oldestCandleOpeningTime: Date = candlesHistory[ 0 ].openingTime;
        if( oldestCandleOpeningTime.getTime() > configuration.startTime.getTime() ) {
            Winston.warn( `Data goes as back as ${ TimeUtils.formatStandard( oldestCandleOpeningTime ) }` );
        }

        return candlesHistory;

    }

}