---

import dayjs from 'dayjs';
import duration from 'dayjs/plugin/duration';

import { parseTimeframe } from 'moex-chart';

import { moexChartTimeConverter, moexChartToIssTimeframe } from '@utils/chartToReqTimeConverter';
import { DEFAULT_SYMBOL } from '@widgets/Chart/const';

import { requestBars, requestRealtimeBars } from '../../requestBars';
import { ChartIndicativeData } from '../../types';

import type { Candle, Timeframes } from 'moex-chart';

dayjs.extend(duration);

interface HistoryRequestState {
  untilTime?: number;
  request: Promise<Candle[] | null> | null;
}

function getRequestSymbol(symbolRaw?: string): string | undefined {
  const symbol = String(symbolRaw ?? '').trim();

  if (!symbol || symbol === DEFAULT_SYMBOL) {
    return undefined;
  }

  return symbol;
}

function getTimeframeSeconds(timeframe: Timeframes): number {
  const { candleWidth, dayjsUnit } = parseTimeframe(timeframe);

  return dayjs.duration(candleWidth, dayjsUnit).asSeconds();
}

function aggregateCandles(candles: Candle[], time: number): Candle | undefined {
  const firstCandle = candles[0];
  const lastCandle = candles[candles.length - 1];

  if (!firstCandle || !lastCandle) {
    return undefined;
  }

  return {
    time,
    open: firstCandle.open,
    high: Math.max(...candles.map(({ high }) => high)),
    low: Math.min(...candles.map(({ low }) => low)),
    close: lastCandle.close,
    volume: candles.reduce((total, candle) => total + (candle.volume ?? 0), 0),
  };
}

// По хорошему - класс должен быть синглтоном, чтобы кормить MoexChart одинаковой датой,
// и не плодить несколько подключений на одни символа
class DataSourceProvider {
  private prevRealtimeDataArr: Candle[] = [];

  private prevRealtimeData: Candle | undefined;

  private realtimeShouldBeConvoluted = false;

  private realtimeSessionStart: number | null = null;

  private realtimeTimer: ReturnType<typeof setInterval> | null = null;

  private historyRequests = new Map<string, HistoryRequestState>();

  public getDataSource =
    (indicativeData?: ChartIndicativeData, cb?: (timeframe: Timeframes) => void) =>
    async (timeframe: Timeframes, symbolId: string, until?: Candle): Promise<Candle[] | null> => {
      const symbol = getRequestSymbol(symbolId);

      if (!symbol) {
        return null;
      }

      const historyRequestKey = `${symbol}:${timeframe}`;
      const historyRequestState = this.historyRequests.get(historyRequestKey);

      if (historyRequestState && historyRequestState.untilTime === until?.time) {
        if (historyRequestState.request) {
          return historyRequestState.request;
        }

        if (until) {
          return null;
        }
      }

      cb?.(timeframe);

      const historyRequest = this.requestHistoryData({
        timeframe,
        symbol,
        until,
        indicativeData,
      });

      this.historyRequests.set(historyRequestKey, {
        untilTime: until?.time,
        request: historyRequest,
      });

      try {
        return await historyRequest;
      } finally {
        if (this.historyRequests.get(historyRequestKey)?.request === historyRequest) {
          if (until) {
            this.historyRequests.set(historyRequestKey, {
              untilTime: until.time,
              request: null,
            });
          } else {
            this.historyRequests.delete(historyRequestKey);
          }
        }
      }
    };

  public startRealtime({
    getSymbols,
    getTimeframe,
    update,
    periodMs = 5000,
    indicativeData,
  }: {
    getSymbols: () => string[];
    getTimeframe: () => Timeframes;
    update: (symbolId: string, candle: Candle) => void;
    periodMs?: number;
    indicativeData?: ChartIndicativeData;
  }): () => void {
    if (this.realtimeTimer) {
      clearInterval(this.realtimeTimer);
    }

    this.realtimeTimer = setInterval(() => {
      const timeframe = getTimeframe();
      const symbolIds = getSymbols();

      Promise.all(
        symbolIds.map(async (symbolId) => {
          const symbol = getRequestSymbol(symbolId);

          if (!symbol) {
            return;
          }

          const data = await requestRealtimeBars({
            currencyPair: symbol.replaceAll(':', '.'),
            interval: moexChartTimeConverter(timeframe),
            ticker: symbol,
            indicativeData,
          });

          if (!data) {
            return;
          }

          if (this.prevRealtimeData && JSON.stringify(data) === JSON.stringify(this.prevRealtimeData)) {
            return;
          }

          if (!this.realtimeShouldBeConvoluted) {
            this.prevRealtimeData = data;
            update(symbol, data);
            return;
          }

          this.realtimeConvolution(timeframe, data, (candle) => {
            update(symbol, candle);
          });
        }),
      );
    }, periodMs);

    return () => {
      if (this.realtimeTimer) {
        clearInterval(this.realtimeTimer);
      }

      this.realtimeTimer = null;
    };
  }

  private async requestHistoryData({
    timeframe,
    symbol,
    until,
    indicativeData,
  }: {
    timeframe: Timeframes;
    symbol: string;
    until?: Candle;
    indicativeData?: ChartIndicativeData;
  }): Promise<Candle[] | null> {
    const interval = moexChartTimeConverter(timeframe);
    const date = until?.time ?? Math.round(Date.now() / 1000);

    const data = await requestBars({
      currencyPair: symbol.replaceAll(':', '.'),
      interval,
      periodParams: {
        firstDataRequest: true,
        to: date,
        from: Math.round(Date.now() / 1000),
        countBack: 2000,
      },
      ticker: symbol,
      indicativeData,
    });

    if (data.length === 0) {
      return null;
    }

    const issTimeframe = moexChartToIssTimeframe(timeframe);

    if (issTimeframe === timeframe) {
      this.realtimeShouldBeConvoluted = false;

      if (!until) {
        this.prevRealtimeData = data[data.length - 1];
        this.prevRealtimeDataArr = [];
        this.realtimeSessionStart = null;
      }

      return data;
    }

    this.realtimeShouldBeConvoluted = true;

    return this.timeframeConvolution(data, timeframe, !until);
  }

  private timeframeConvolution(data: Candle[], requestedTimeframe: Timeframes, syncRealtime: boolean): Candle[] {
    const timeframeSeconds = getTimeframeSeconds(requestedTimeframe);
    const sortedData = [...data].sort((first, second) => first.time - second.time);

    const firstCandle = sortedData[0];

    if (!firstCandle) {
      return [];
    }

    const result: Candle[] = [];

    let sessionStart = firstCandle.time;
    let bucketStart = sessionStart;
    let candleGroup: Candle[] = [];

    sortedData.forEach((candle, index) => {
      const previousCandle = sortedData[index - 1];

      const isNewSession = previousCandle && candle.time - previousCandle.time > timeframeSeconds;

      if (isNewSession) {
        const aggregatedCandle = aggregateCandles(candleGroup, bucketStart);

        if (aggregatedCandle) {
          result.push(aggregatedCandle);
        }

        sessionStart = candle.time;
        bucketStart = candle.time;
        candleGroup = [candle];

        return;
      }

      const currentBucketStart =
        sessionStart + Math.floor((candle.time - sessionStart) / timeframeSeconds) * timeframeSeconds;

      if (currentBucketStart !== bucketStart) {
        const aggregatedCandle = aggregateCandles(candleGroup, bucketStart);

        if (aggregatedCandle) {
          result.push(aggregatedCandle);
        }

        bucketStart = currentBucketStart;
        candleGroup = [];
      }

      candleGroup.push(candle);
    });

    const aggregatedCandle = aggregateCandles(candleGroup, bucketStart);

    if (aggregatedCandle) {
      result.push(aggregatedCandle);
    }

    if (syncRealtime) {
      this.realtimeSessionStart = sessionStart;
      this.prevRealtimeDataArr = [...candleGroup];
      this.prevRealtimeData = sortedData[sortedData.length - 1];
    }

    return result;
  }

  private realtimeConvolution(timeframe: Timeframes, data: Candle, update: (candle: Candle) => void): void {
    const timeframeSeconds = getTimeframeSeconds(timeframe);

    if (!this.prevRealtimeData || this.realtimeSessionStart === null) {
      this.realtimeSessionStart = data.time;
      this.prevRealtimeDataArr = [data];
    } else {
      const isNewSession = data.time - this.prevRealtimeData.time > timeframeSeconds;

      if (isNewSession) {
        this.realtimeSessionStart = data.time;
        this.prevRealtimeDataArr = [data];
      } else {
        const previousBucketStart =
          this.realtimeSessionStart +
          Math.floor((this.prevRealtimeData.time - this.realtimeSessionStart) / timeframeSeconds) * timeframeSeconds;

        const currentBucketStart =
          this.realtimeSessionStart +
          Math.floor((data.time - this.realtimeSessionStart) / timeframeSeconds) * timeframeSeconds;

        if (currentBucketStart !== previousBucketStart) {
          this.prevRealtimeDataArr = [data];
        } else {
          const candleIndex = this.prevRealtimeDataArr.findIndex((candle) => candle.time === data.time);

          if (candleIndex === -1) {
            this.prevRealtimeDataArr.push(data);
          } else {
            this.prevRealtimeDataArr[candleIndex] = data;
          }
        }
      }
    }

    this.prevRealtimeData = data;

    const sessionStart = this.realtimeSessionStart;

    if (sessionStart === null) {
      return;
    }

    const bucketStart = sessionStart + Math.floor((data.time - sessionStart) / timeframeSeconds) * timeframeSeconds;

    const candle = aggregateCandles(this.prevRealtimeDataArr, bucketStart);

    if (candle) {
      update(candle);
    }
  }
}

export { DataSourceProvider };



import dayjs from 'dayjs';
import utc from 'dayjs/plugin/utc';

import { indicativeQuotesController } from '@api/controllers/indicativeQuotesController';
import api from '@api/index';

import { candleToBar } from '@utils/candleToBar';

import { ChartIndicativeData } from './types';
import { isIndicativeTicker } from './utils/isIndicativeTicker';
import { transformKeyToLowerCase } from './utils/transformKeyToLowerCase';

import type { Candle } from 'moex-chart';

dayjs.extend(utc);

export interface PeriodParams {
  from: number;
  to: number;
  countBack: number;
  firstDataRequest: boolean;
}
export interface HistoryMetadata {
  noData: boolean;
}
export type HistoryCallback = (candles: Candle[], metadata: HistoryMetadata) => void;
export type SubscribeBarsCallback = (candle: Candle) => void;

interface RequestBarsArgs {
  currencyPair: string;
  interval: string;
  periodParams: PeriodParams;
  onHistoryCallback?: HistoryCallback;
  ticker?: string;
  indicativeData?: ChartIndicativeData;
}

interface RequestRealtimeBarsArgs {
  currencyPair: string;
  interval: string;
  ticker?: string;
  indicativeData?: ChartIndicativeData;
  onRealtimeCallback?: SubscribeBarsCallback;
}

export type CustomBarsResolver = (args: {
  ticker?: string;
  currencyPair: string;
  periodParams: PeriodParams;
  interval: string;
}) => Promise<Candle[]>;

const barsResolvers = new Map<string, CustomBarsResolver>();

export const registerBarsResolver = (boardKey: string, resolver: CustomBarsResolver) => {
  barsResolvers.set(boardKey, resolver);
};

const getResolverKey = (ticker?: string) => {
  const [source, board] = ticker?.split(/[:.]/) ?? [];

  if (!source || !board) {
    return '';
  }

  return `${source}:${board}`;
};

const getBarsResolver = (ticker?: string) => barsResolvers.get(getResolverKey(ticker));

export async function requestBars({
  currencyPair,
  interval,
  periodParams,
  onHistoryCallback,
  ticker,
  indicativeData,
}: RequestBarsArgs): Promise<Candle[]> {
  const customResolver = getBarsResolver(ticker);
  if (customResolver) {
    try {
      const customBars = await customResolver({ ticker, currencyPair, periodParams, interval });
      const toMs = periodParams.to * 1000;
      const olderBars = customBars.filter((bar) => bar.time < toMs);
      onHistoryCallback?.(olderBars, { noData: olderBars.length === 0 });
      return olderBars;
    } catch (e) {
      onHistoryCallback?.([], { noData: true });
      return [];
    }
  }

  const date = new Date(periodParams.to * 1000);
  const year = date.getUTCFullYear();
  const month = `0${date.getUTCMonth() + 1}`.slice(-2);
  const day = `0${date.getUTCDate()}`.slice(-2);
  const hours = `0${date.getUTCHours()}`.slice(-2);
  const minutes = `0${date.getUTCMinutes()}`.slice(-2);
  const seconds = `0${date.getUTCSeconds()}`.slice(-2);

  const hasIndicativeBoardInTicker = isIndicativeTicker(ticker);

  // если при инициализации графика были данные indicativeData и текущий инструмент совпадает
  // то отправляем запрос на индикатив
  // иначе на инструменты
  const isIndicativeInstrument = (indicativeData && indicativeData.key === ticker) || hasIndicativeBoardInTicker;

  if (isIndicativeInstrument) {
    const dateStr = `${year}-${month}-${day}T${hours}:${minutes}:${seconds}`;

    const lowerCaseKey = transformKeyToLowerCase(currencyPair);

    if (!lowerCaseKey) {
      onHistoryCallback?.([], { noData: true });
      return [];
    }

    try {
      const { data } = await indicativeQuotesController.getCandles({
        count: periodParams.countBack,
        key: lowerCaseKey,
        date: dateStr,
        interval,
      });

      const candles = data.indicativeCandles.reverse().map(candleToBar);

      onHistoryCallback?.(candles, {
        noData: candles.length === 0,
      });

      return candles;
    } catch {
      onHistoryCallback?.([], {
        noData: true,
      });

      return [];
    }
  }

  const dateStr = `${year}-${month}-${day}%20${hours}:${minutes}:${seconds}`;

  try {
    const { data } = await api.getBars({
      currencyPair,
      date: dateStr,
      interval,
      count: periodParams.countBack,
      ticker,
    });

    const bars = data.reverse().map(candleToBar);

    onHistoryCallback?.(bars, {
      noData: bars.length === 0,
    });

    return bars;
  } catch {
    onHistoryCallback?.([], {
      noData: true,
    });

    return [];
  }
}

export async function requestRealtimeBars({
  currencyPair,
  interval,
  ticker,
  onRealtimeCallback,
  indicativeData,
}: RequestRealtimeBarsArgs): Promise<Candle | undefined> {
  if (getBarsResolver(ticker)) {
    return;
  }

  const hasIndicativeBoardInTicker = isIndicativeTicker(ticker);

  // если при инициализации графика были данные indicativeData и текущий инструмент совпадает
  // то отправляем запрос на индикатив
  // иначе на инструменты
  const isIndicativeInstrument = (indicativeData && indicativeData.key === ticker) || hasIndicativeBoardInTicker;

  if (isIndicativeInstrument) {
    const lowerCaseKey = transformKeyToLowerCase(currencyPair);

    if (!lowerCaseKey) {
      return undefined;
    }

    try {
      const { data } = await indicativeQuotesController.getCandles({
        count: 1,
        key: lowerCaseKey,
        date: dayjs().utc().add(1, 'minute').format('YYYY-MM-DDTHH:mm:ss'),
        interval,
      });

      if (data.indicativeCandles.length === 0) {
        return undefined;
      }

      const sortedData = [...data.indicativeCandles].sort(
        (first, second) => new Date(first.end).valueOf() - new Date(second.end).valueOf(),
      );

      const firstCandle = sortedData[0];

      if (!firstCandle) {
        return undefined;
      }

      const bar = candleToBar(firstCandle);

      onRealtimeCallback?.(bar);

      return bar;
    } catch (error) {
      console.error('error from requestRealTimeBars indicativeQuotesController: ', error);

      return undefined;
    }
  }

  try {
    const { data } = await api.getBars({
      currencyPair,
      date: dayjs().utc().add(1, 'minute').format('YYYY-MM-DD%20HH:mm:ss'),
      interval,
      count: 1,
      ticker,
    });

    if (data.length === 0) {
      return undefined;
    }

    const sortedData = [...data].sort(
      (first, second) => new Date(first.end).valueOf() - new Date(second.end).valueOf(),
    );

    const firstCandle = sortedData[0];

    if (!firstCandle) {
      return undefined;
    }

    const bar = candleToBar(firstCandle);

    onRealtimeCallback?.(bar);

    return bar;
  } catch (error) {
    console.error('error from requestRealTimeBars: ', error);

    return undefined;
  }
}