---

export { PriceAxisLabelsController } from './PriceAxisLabelsController';
export { PriceAxisLabelsPrimitive } from './PriceAxisLabelsPrimitive';
export { layoutPriceAxisLabels } from './layout';
export type { LaidOutPriceAxisLabel, PriceAxisLabel, PriceAxisLabelsLayoutOptions, PriceAxisLabelStyle } from './types';



#####

import { LaidOutPriceAxisLabel, PRICE_AXIS_LABEL_HEIGHT, PriceAxisLabel, PriceAxisLabelsLayoutOptions } from './types';

const DEFAULT_LABEL_GAP = 2;
const DEFAULT_DUPLICATE_TOLERANCE = 1;

function compareLabels(left: PriceAxisLabel, right: PriceAxisLabel): number {
  if (left.desiredCoordinate !== right.desiredCoordinate) {
    return left.desiredCoordinate - right.desiredCoordinate;
  }

  const priorityDiff = (right.priority ?? 0) - (left.priority ?? 0);

  if (priorityDiff !== 0) {
    return priorityDiff;
  }

  return left.id.localeCompare(right.id);
}

function isDuplicate(left: PriceAxisLabel, right: PriceAxisLabel, tolerance: number): boolean {
  return (
    left.text === right.text &&
    left.symbol === right.symbol &&
    Math.abs(left.desiredCoordinate - right.desiredCoordinate) <= tolerance
  );
}

function deduplicateLabels(labels: readonly PriceAxisLabel[], tolerance: number): PriceAxisLabel[] {
  const sortedLabels = [...labels].sort((left, right) => {
    const priorityDiff = (right.priority ?? 0) - (left.priority ?? 0);

    if (priorityDiff !== 0) {
      return priorityDiff;
    }

    return left.id.localeCompare(right.id);
  });

  const result: PriceAxisLabel[] = [];

  sortedLabels.forEach((label) => {
    const duplicateExists = result.some((currentLabel) => isDuplicate(currentLabel, label, tolerance));

    if (!duplicateExists) {
      result.push(label);
    }
  });

  return result;
}

function createLaidOutLabel(label: PriceAxisLabel, coordinate: number): LaidOutPriceAxisLabel {
  return {
    ...label,
    coordinate,
    height: label.height ?? PRICE_AXIS_LABEL_HEIGHT,
  };
}

function distributeLabelsInsideSmallAxis(
  labels: readonly PriceAxisLabel[],
  axisHeight: number,
): LaidOutPriceAxisLabel[] {
  if (labels.length === 0) {
    return [];
  }

  if (labels.length === 1) {
    const label = labels[0];
    const height = label.height ?? PRICE_AXIS_LABEL_HEIGHT;
    const minCoordinate = height / 2;
    const maxCoordinate = Math.max(minCoordinate, axisHeight - height / 2);

    return [createLaidOutLabel(label, Math.min(Math.max(label.desiredCoordinate, minCoordinate), maxCoordinate))];
  }

  const firstHeight = labels[0].height ?? PRICE_AXIS_LABEL_HEIGHT;
  const lastHeight = labels[labels.length - 1].height ?? PRICE_AXIS_LABEL_HEIGHT;
  const minCoordinate = firstHeight / 2;
  const maxCoordinate = Math.max(minCoordinate, axisHeight - lastHeight / 2);
  const step = Math.max(0, (maxCoordinate - minCoordinate) / (labels.length - 1));

  return labels.map((label, index) => createLaidOutLabel(label, minCoordinate + step * index));
}

function resolveCollisionGroup(
  labels: readonly PriceAxisLabel[],
  axisHeight: number,
  gap: number,
): LaidOutPriceAxisLabel[] {
  const sortedLabels = [...labels].sort(compareLabels);

  if (sortedLabels.length === 0) {
    return [];
  }

  const totalLabelsHeight = sortedLabels.reduce((total, label) => total + (label.height ?? PRICE_AXIS_LABEL_HEIGHT), 0);

  if (totalLabelsHeight > axisHeight) {
    return distributeLabelsInsideSmallAxis(sortedLabels, axisHeight);
  }

  const maxAvailableGap =
    sortedLabels.length > 1 ? Math.max(0, (axisHeight - totalLabelsHeight) / (sortedLabels.length - 1)) : gap;
  const effectiveGap = Math.min(gap, maxAvailableGap);

  const resolvedLabels = sortedLabels.map((label) => {
    const height = label.height ?? PRICE_AXIS_LABEL_HEIGHT;
    const minCoordinate = height / 2;
    const maxCoordinate = Math.max(minCoordinate, axisHeight - height / 2);

    return createLaidOutLabel(label, Math.min(Math.max(label.desiredCoordinate, minCoordinate), maxCoordinate));
  });

  for (let index = 1; index < resolvedLabels.length; index += 1) {
    const previousLabel = resolvedLabels[index - 1];
    const currentLabel = resolvedLabels[index];
    const minCoordinate = previousLabel.coordinate + previousLabel.height / 2 + currentLabel.height / 2 + effectiveGap;

    if (currentLabel.coordinate < minCoordinate) {
      currentLabel.coordinate = minCoordinate;
    }
  }

  const lastLabel = resolvedLabels[resolvedLabels.length - 1];
  const lastMaxCoordinate = axisHeight - lastLabel.height / 2;

  if (lastLabel.coordinate > lastMaxCoordinate) {
    const offset = lastLabel.coordinate - lastMaxCoordinate;

    resolvedLabels.forEach((label) => {
      label.coordinate -= offset;
    });
  }

  for (let index = resolvedLabels.length - 2; index >= 0; index -= 1) {
    const currentLabel = resolvedLabels[index];
    const nextLabel = resolvedLabels[index + 1];
    const maxCoordinate = nextLabel.coordinate - nextLabel.height / 2 - currentLabel.height / 2 - effectiveGap;

    if (currentLabel.coordinate > maxCoordinate) {
      currentLabel.coordinate = maxCoordinate;
    }
  }

  const firstLabel = resolvedLabels[0];
  const firstMinCoordinate = firstLabel.height / 2;

  if (firstLabel.coordinate < firstMinCoordinate) {
    const offset = firstMinCoordinate - firstLabel.coordinate;

    resolvedLabels.forEach((label) => {
      label.coordinate += offset;
    });
  }

  return resolvedLabels;
}

export function layoutPriceAxisLabels(
  labels: readonly PriceAxisLabel[],
  axisHeight: number,
  options: PriceAxisLabelsLayoutOptions = {},
): LaidOutPriceAxisLabel[] {
  if (axisHeight <= 0 || labels.length === 0) {
    return [];
  }

  const gap = options.gap ?? DEFAULT_LABEL_GAP;
  const duplicateTolerance = options.duplicateTolerance ?? DEFAULT_DUPLICATE_TOLERANCE;
  const labelsByCollisionGroup = new Map<string, PriceAxisLabel[]>();

  labels.forEach((label) => {
    if (!Number.isFinite(label.desiredCoordinate)) {
      return;
    }

    const group = labelsByCollisionGroup.get(label.collisionGroup);

    if (group) {
      group.push(label);
      return;
    }

    labelsByCollisionGroup.set(label.collisionGroup, [label]);
  });

  const result: LaidOutPriceAxisLabel[] = [];

  labelsByCollisionGroup.forEach((groupLabels) => {
    const uniqueLabels = deduplicateLabels(groupLabels, duplicateTolerance);

    result.push(...resolveCollisionGroup(uniqueLabels, axisHeight, gap));
  });

  return result.sort((left, right) => {
    const priorityDiff = (left.priority ?? 0) - (right.priority ?? 0);

    if (priorityDiff !== 0) {
      return priorityDiff;
    }

    return left.id.localeCompare(right.id);
  });
}


####

import { IPriceLine, LogicalRange, MismatchDirection, PriceScaleMode } from 'lightweight-charts';
import { Observable, Subscription } from 'rxjs';

import { Indicator } from '@core/Indicator';
import { IndicatorsIds, MAIN_PANE_INDEX } from '@src/constants';
import { SeriesStrategies } from '@src/modules/series-strategies/SeriesFactory';
import { getThemeStore } from '@src/theme';
import { Direction } from '@src/types';
import { formatCompactNumber } from '@src/utils';
import { removeAlphaFromHex } from '@src/utils/removeAlphaFromHex';

import { PriceAxisLabelsPrimitive } from './PriceAxisLabelsPrimitive';
import { PRICE_AXIS_LABEL_HEIGHT, PriceAxisLabel } from './types';

type EntityCollection = 'compare' | 'indicator';
type SourceRole = 'main' | 'compare' | 'indicator' | 'volume';
type PriceAxisSide = Direction.Left | Direction.Right;

interface PriceAxisLabelsControllerParams {
  mainSeries$: Observable<SeriesStrategies | null>;
  mainSymbol$: Observable<string>;
  compareEntities$: Observable<Indicator[]>;
  indicatorEntities$: Observable<Indicator[]>;
}

interface PriceLabelSource {
  id: string;
  role: SourceRole;
  series: SeriesStrategies;
  collisionGroup: string;
  priority: number;
  symbol?: string;
}

interface SourceDefaults {
  lastValueVisible: boolean;
  priceLineVisible: boolean;
}

interface AxisLabelsGroup {
  paneIndex: number;
  side: PriceAxisSide;
  labels: PriceAxisLabel[];
}

interface AxisLayer {
  host: SeriesStrategies;
  primitive: PriceAxisLabelsPrimitive;
}

const SOURCE_PRIORITY: Record<SourceRole, number> = {
  main: 100,
  compare: 80,
  indicator: 50,
  volume: 30,
};

function getDataPrice(data: unknown): number | null {
  if (!data || typeof data !== 'object') {
    return null;
  }

  if ('close' in data && typeof data.close === 'number') {
    return data.close;
  }

  if ('value' in data && typeof data.value === 'number') {
    return data.value;
  }

  return null;
}

function toOpaqueColor(color: string): string {
  return /^#[0-9a-fA-F]{8}$/.test(color) ? removeAlphaFromHex(color) : color;
}

function getSeriesColor(series: SeriesStrategies, data: unknown): string {
  if (data && typeof data === 'object' && 'color' in data && typeof data.color === 'string') {
    return toOpaqueColor(data.color);
  }

  const options = series.options() as unknown as Record<string, unknown>;

  if (
    data &&
    typeof data === 'object' &&
    'open' in data &&
    'close' in data &&
    typeof data.open === 'number' &&
    typeof data.close === 'number'
  ) {
    const candleColor = data.close >= data.open ? options.upColor : options.downColor;

    if (typeof candleColor === 'string') {
      return toOpaqueColor(candleColor);
    }
  }

  const color = [options.color, options.lineColor, options.topLineColor, options.bottomLineColor].find(
    (value): value is string => typeof value === 'string',
  );

  return color ? toOpaqueColor(color) : toOpaqueColor(getThemeStore().colors.chartLineColor);
}

function getContrastTextColor(color: string): string {
  const normalizedColor = toOpaqueColor(color).replace('#', '').slice(0, 6);

  if (normalizedColor.length !== 6) {
    return '#FFFFFF';
  }

  const red = Number.parseInt(normalizedColor.slice(0, 2), 16);
  const green = Number.parseInt(normalizedColor.slice(2, 4), 16);
  const blue = Number.parseInt(normalizedColor.slice(4, 6), 16);

  if (Number.isNaN(red) || Number.isNaN(green) || Number.isNaN(blue)) {
    return '#FFFFFF';
  }

  const luminance = (red * 0.299 + green * 0.587 + blue * 0.114) / 255;

  return luminance > 0.6 ? '#000000' : '#FFFFFF';
}

function getShortSymbol(symbol: string): string {
  const parts = symbol.split(':');

  return parts[parts.length - 1] || symbol;
}

function getAxisSide(source: PriceLabelSource): PriceAxisSide {
  if (source.role === 'volume') {
    return Direction.Right;
  }

  return source.series.options().priceScaleId === Direction.Left ? Direction.Left : Direction.Right;
}

function getAxisKey(paneIndex: number, side: PriceAxisSide): string {
  return `${paneIndex}:${side}`;
}

function getEntityKey(collection: EntityCollection, entity: Indicator): string {
  return `${collection}:${entity.getId()}`;
}

function areSeriesListsEqual(
  currentSeries: readonly SeriesStrategies[] | undefined,
  nextSeries: readonly SeriesStrategies[],
): boolean {
  return (
    currentSeries?.length === nextSeries.length && currentSeries.every((series, index) => series === nextSeries[index])
  );
}

export class PriceAxisLabelsController {
  private readonly subscriptions = new Subscription();
  private readonly entitySubscriptions = new Map<string, Subscription>();
  private readonly entitySeries = new Map<string, readonly SeriesStrategies[]>();
  private readonly sourceDefaults = new WeakMap<SeriesStrategies, SourceDefaults>();
  private readonly layers = new Map<string, AxisLayer>();

  private mainSeries: SeriesStrategies | null = null;
  private mainSeriesDataHandler: (() => void) | null = null;
  private compareEntities: Indicator[] = [];
  private indicatorEntities: Indicator[] = [];
  private visibleLogicalRange: LogicalRange | null = null;
  private currentPriceLine: IPriceLine | null = null;
  private currentPriceLineHost: SeriesStrategies | null = null;
  private mainSymbol = '';
  private isHistoryMode = false;
  private updateFrame: number | null = null;

  constructor({ mainSeries$, mainSymbol$, compareEntities$, indicatorEntities$ }: PriceAxisLabelsControllerParams) {
    this.subscriptions.add(
      mainSymbol$.subscribe((symbol) => {
        this.mainSymbol = getShortSymbol(symbol);
        this.scheduleUpdate();
      }),
    );

    this.subscriptions.add(
      mainSeries$.subscribe((series) => {
        this.setMainSeries(series);
      }),
    );

    this.subscriptions.add(
      compareEntities$.subscribe((entities) => {
        this.setEntities('compare', entities);
      }),
    );

    this.subscriptions.add(
      indicatorEntities$.subscribe((entities) => {
        this.setEntities('indicator', entities);
      }),
    );
  }

  public setVisibleLogicalRange(logicalRange: LogicalRange | null): void {
    this.visibleLogicalRange = logicalRange;
    this.refreshHistoryMode();
    this.scheduleUpdate();
  }

  public invalidate(): void {
    this.scheduleUpdate();
  }

  public destroy(): void {
    if (this.updateFrame !== null && typeof cancelAnimationFrame === 'function') {
      cancelAnimationFrame(this.updateFrame);
      this.updateFrame = null;
    }

    this.unsubscribeMainSeries();
    this.subscriptions.unsubscribe();

    this.entitySubscriptions.forEach((subscription) => {
      subscription.unsubscribe();
    });
    this.entitySubscriptions.clear();
    this.entitySeries.clear();

    this.getSources().forEach((source) => {
      this.restoreSourceOptions(source.series);
    });

    this.layers.forEach(({ host, primitive }) => {
      try {
        host.detachPrimitive(primitive);
      } catch {
        // Серия могла быть удалена раньше контроллера.
      }
    });
    this.layers.clear();
    this.removeCurrentPriceLine();
  }

  private setMainSeries(series: SeriesStrategies | null): void {
    if (this.mainSeries === series) {
      return;
    }

    const previousSeries = this.mainSeries;

    this.unsubscribeMainSeries();

    if (previousSeries) {
      this.restoreSourceOptions(previousSeries);
    }

    this.mainSeries = series;

    if (series) {
      this.ensureSourceDefaults(series);
      this.mainSeriesDataHandler = () => {
        this.refreshHistoryMode();
        this.scheduleUpdate();
      };
      series.subscribeDataChanged(this.mainSeriesDataHandler);
    }

    if (this.currentPriceLineHost && this.currentPriceLineHost !== series) {
      this.removeCurrentPriceLine();
    }

    this.refreshHistoryMode();
    this.applyDisplayMode();
    this.scheduleUpdate();
  }

  private unsubscribeMainSeries(): void {
    if (!this.mainSeries || !this.mainSeriesDataHandler) {
      this.mainSeriesDataHandler = null;
      return;
    }

    try {
      this.mainSeries.unsubscribeDataChanged(this.mainSeriesDataHandler);
    } catch {
      // Серия могла быть удалена раньше контроллера.
    }

    this.mainSeriesDataHandler = null;
  }

  private setEntities(collection: EntityCollection, entities: Indicator[]): void {
    if (collection === 'compare') {
      this.compareEntities = entities;
    } else {
      this.indicatorEntities = entities;
    }

    this.syncEntitySubscriptions(collection, entities);
    this.applyDisplayMode();
    this.scheduleUpdate();
  }

  private syncEntitySubscriptions(collection: EntityCollection, entities: Indicator[]): void {
    const activeKeys = new Set(entities.map((entity) => getEntityKey(collection, entity)));

    this.entitySubscriptions.forEach((subscription, key) => {
      if (!key.startsWith(`${collection}:`) || activeKeys.has(key)) {
        return;
      }

      subscription.unsubscribe();
      this.entitySubscriptions.delete(key);
      this.entitySeries.delete(key);
    });

    entities.forEach((entity) => {
      const key = getEntityKey(collection, entity);
      const nextSeries = Array.from(entity.getSeriesMap().values());
      const currentSeries = this.entitySeries.get(key);

      if (!areSeriesListsEqual(currentSeries, nextSeries)) {
        this.entitySeries.set(key, nextSeries);
        this.applyDisplayModeToSources(this.getEntitySources(collection, entity));
      }

      if (this.entitySubscriptions.has(key)) {
        return;
      }

      const subscription = entity.subscribeDataChange(() => {
        const updatedSeries = Array.from(entity.getSeriesMap().values());
        const registeredSeries = this.entitySeries.get(key);

        if (!areSeriesListsEqual(registeredSeries, updatedSeries)) {
          this.entitySeries.set(key, updatedSeries);
          this.applyDisplayModeToSources(this.getEntitySources(collection, entity));
        }

        this.scheduleUpdate();
      });

      this.entitySubscriptions.set(key, subscription);
    });
  }

  private getSources(): PriceLabelSource[] {
    const sources: PriceLabelSource[] = [];

    if (this.mainSeries) {
      sources.push({
        id: 'main',
        role: 'main',
        series: this.mainSeries,
        collisionGroup: 'main',
        priority: SOURCE_PRIORITY.main,
      });
    }

    this.compareEntities.forEach((entity) => {
      sources.push(...this.getEntitySources('compare', entity));
    });

    this.indicatorEntities.forEach((entity) => {
      sources.push(...this.getEntitySources('indicator', entity));
    });

    return sources;
  }

  private getEntitySources(collection: EntityCollection, entity: Indicator): PriceLabelSource[] {
    const isVolume = collection === 'indicator' && entity.getType() === IndicatorsIds.Volume;
    const role: SourceRole = collection === 'compare' ? 'compare' : isVolume ? 'volume' : 'indicator';
    const collisionGroup =
      role === 'volume' ? 'volume' : role === 'compare' ? `compare:${entity.getId()}` : `indicator:${entity.getId()}`;
    const symbol = role === 'compare' ? getShortSymbol(entity.getLabel()) : undefined;

    return Array.from(entity.getSeriesMap().entries()).map(([seriesId, series]) => ({
      id: `${collection}:${entity.getId()}:${seriesId}`,
      role,
      series,
      collisionGroup,
      priority: SOURCE_PRIORITY[role],
      symbol,
    }));
  }

  private ensureSourceDefaults(series: SeriesStrategies): SourceDefaults {
    const currentDefaults = this.sourceDefaults.get(series);

    if (currentDefaults) {
      return currentDefaults;
    }

    const options = series.options();
    const defaults = {
      lastValueVisible: options.lastValueVisible,
      priceLineVisible: options.priceLineVisible,
    };

    this.sourceDefaults.set(series, defaults);

    return defaults;
  }

  private restoreSourceOptions(series: SeriesStrategies): void {
    const defaults = this.sourceDefaults.get(series);

    if (!defaults) {
      return;
    }

    try {
      series.applyOptions(defaults);
    } catch {
      // Серия могла быть удалена раньше контроллера.
    }
  }

  private applyDisplayMode(): void {
    this.applyDisplayModeToSources(this.getSources());

    if (!this.isHistoryMode) {
      this.hideCurrentPriceLine();
    }
  }

  private applyDisplayModeToSources(sources: readonly PriceLabelSource[]): void {
    sources.forEach((source) => {
      const defaults = this.ensureSourceDefaults(source.series);

      try {
        if (source.role === 'volume') {
          source.series.applyOptions({
            lastValueVisible: false,
            priceLineVisible: false,
          });
          return;
        }

        source.series.applyOptions({
          lastValueVisible: this.isHistoryMode ? false : defaults.lastValueVisible,
        });
      } catch {
        // Серия могла быть удалена раньше контроллера.
      }
    });
  }

  private getHistoryMode(logicalRange: LogicalRange | null): boolean {
    if (!logicalRange || !this.mainSeries) {
      return false;
    }

    const barsInfo = this.mainSeries.barsInLogicalRange(logicalRange);

    return (barsInfo?.barsAfter ?? 0) > 0;
  }

  private refreshHistoryMode(): void {
    const nextHistoryMode = this.getHistoryMode(this.visibleLogicalRange);

    if (this.isHistoryMode === nextHistoryMode) {
      return;
    }

    this.isHistoryMode = nextHistoryMode;
    this.applyDisplayMode();
  }

  private scheduleUpdate(): void {
    if (this.updateFrame !== null) {
      return;
    }

    if (typeof requestAnimationFrame !== 'function') {
      this.update();
      return;
    }

    this.updateFrame = requestAnimationFrame(() => {
      this.updateFrame = null;
      this.update();
    });
  }

  private update(): void {
    const sources = this.getSources();

    this.updateCurrentPriceLine(sources);
    this.updateAxisLayers(this.collectAxisGroups(sources), sources);
  }

  private collectAxisGroups(sources: readonly PriceLabelSource[]): Map<string, AxisLabelsGroup> {
    const groups = new Map<string, AxisLabelsGroup>();

    sources.forEach((source) => {
      if (!source.series.isVisible()) {
        return;
      }

      if (source.role !== 'volume' && !this.isHistoryMode) {
        return;
      }

      const label = this.createLabel(source);

      if (!label) {
        return;
      }

      const paneIndex = source.series.getPane().paneIndex();
      const side = getAxisSide(source);
      const axisKey = getAxisKey(paneIndex, side);
      const group = groups.get(axisKey);

      if (group) {
        group.labels.push(label);
        return;
      }

      groups.set(axisKey, {
        paneIndex,
        side,
        labels: [label],
      });
    });

    return groups;
  }

  private createLabel(source: PriceLabelSource): PriceAxisLabel | null {
    const data = this.getSourceData(source);
    const price = getDataPrice(data);

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

    const coordinate = source.series.priceToCoordinate(price);

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

    if (source.role === 'main') {
      const currentCoordinate = this.getCurrentMainPriceCoordinate();

      if (currentCoordinate !== null && Math.abs(currentCoordinate - coordinate) <= PRICE_AXIS_LABEL_HEIGHT + 2) {
        return null;
      }
    }

    return {
      id: source.id,
      collisionGroup: source.collisionGroup,
      desiredCoordinate: coordinate,
      text:
        source.role === 'volume' ? String(formatCompactNumber(price) ?? price) : this.formatValue(source.series, price),
      color: getSeriesColor(source.series, data),
      style: this.isHistoryMode ? 'outlined' : 'filled',
      symbol: source.role === 'main' ? this.mainSymbol : source.role === 'compare' ? source.symbol : undefined,
      priority: source.priority,
      height: PRICE_AXIS_LABEL_HEIGHT,
    };
  }

  private getSourceData(source: PriceLabelSource): unknown {
    if (this.isHistoryMode && this.visibleLogicalRange) {
      return source.series.dataByIndex(Math.floor(this.visibleLogicalRange.to), MismatchDirection.NearestLeft);
    }

    const data = source.series.data();

    return data.length > 0 ? data[data.length - 1] : null;
  }

  private updateAxisLayers(groups: Map<string, AxisLabelsGroup>, sources: readonly PriceLabelSource[]): void {
    const activeLayerKeys = new Set<string>();

    groups.forEach((group, axisKey) => {
      const host = this.getAxisHost(group.paneIndex, group.side, sources);

      if (!host) {
        return;
      }

      activeLayerKeys.add(axisKey);
      this.getOrCreateLayer(axisKey, host).primitive.setLabels(group.labels);
    });

    this.layers.forEach((layer, axisKey) => {
      if (activeLayerKeys.has(axisKey)) {
        return;
      }

      try {
        layer.host.detachPrimitive(layer.primitive);
      } catch {
        // Серия могла быть удалена раньше контроллера.
      }

      this.layers.delete(axisKey);
    });
  }

  private getAxisHost(
    paneIndex: number,
    side: PriceAxisSide,
    sources: readonly PriceLabelSource[],
  ): SeriesStrategies | null {
    if (paneIndex === MAIN_PANE_INDEX && side === Direction.Right && this.mainSeries) {
      return this.mainSeries;
    }

    const regularSource = sources.find(
      (source) =>
        source.role !== 'volume' && source.series.getPane().paneIndex() === paneIndex && getAxisSide(source) === side,
    );

    if (regularSource) {
      return regularSource.series;
    }

    const fallbackSource = sources.find(
      (source) => source.series.getPane().paneIndex() === paneIndex && getAxisSide(source) === side,
    );

    return fallbackSource?.series ?? null;
  }

  private getOrCreateLayer(axisKey: string, host: SeriesStrategies): AxisLayer {
    const currentLayer = this.layers.get(axisKey);

    if (currentLayer?.host === host) {
      return currentLayer;
    }

    if (currentLayer) {
      try {
        currentLayer.host.detachPrimitive(currentLayer.primitive);
      } catch {
        // Серия могла быть удалена раньше контроллера.
      }
    }

    const primitive = new PriceAxisLabelsPrimitive();

    host.attachPrimitive(primitive);

    const nextLayer = { host, primitive };

    this.layers.set(axisKey, nextLayer);

    return nextLayer;
  }

  private updateCurrentPriceLine(sources: readonly PriceLabelSource[]): void {
    const mainSource = sources.find((source) => source.role === 'main');

    if (!this.isHistoryMode || !mainSource || !mainSource.series.isVisible()) {
      this.hideCurrentPriceLine();
      return;
    }

    const data = mainSource.series.data();
    const lastData = data.length > 0 ? data[data.length - 1] : null;
    const price = getDataPrice(lastData);

    if (price === null) {
      this.hideCurrentPriceLine();
      return;
    }

    const color = getSeriesColor(mainSource.series, lastData);
    const priceLine = this.getCurrentPriceLine(mainSource.series, color);

    priceLine.applyOptions({
      price,
      color,
      lineVisible: false,
      axisLabelVisible: true,
      axisLabelColor: color,
      axisLabelTextColor: getContrastTextColor(color),
      title: this.mainSymbol,
    });
  }

  private getCurrentMainPriceCoordinate(): number | null {
    if (!this.mainSeries) {
      return null;
    }

    const data = this.mainSeries.data();
    const lastData = data.length > 0 ? data[data.length - 1] : null;
    const price = getDataPrice(lastData);

    return price === null ? null : this.mainSeries.priceToCoordinate(price);
  }

  private getCurrentPriceLine(series: SeriesStrategies, color: string): IPriceLine {
    if (this.currentPriceLine && this.currentPriceLineHost === series) {
      return this.currentPriceLine;
    }

    this.removeCurrentPriceLine();

    this.currentPriceLine = series.createPriceLine({
      price: 0,
      color,
      lineVisible: false,
      axisLabelVisible: false,
      title: '',
    });
    this.currentPriceLineHost = series;

    return this.currentPriceLine;
  }

  private hideCurrentPriceLine(): void {
    this.currentPriceLine?.applyOptions({
      lineVisible: false,
      axisLabelVisible: false,
      title: '',
    });
  }

  private removeCurrentPriceLine(): void {
    if (this.currentPriceLine && this.currentPriceLineHost) {
      try {
        this.currentPriceLineHost.removePriceLine(this.currentPriceLine);
      } catch {
        // Серия могла быть удалена раньше контроллера.
      }
    }

    this.currentPriceLine = null;
    this.currentPriceLineHost = null;
  }

  private formatValue(series: SeriesStrategies, price: number): string {
    const mode = series.priceScale().options().mode;

    if (mode !== PriceScaleMode.Percentage && mode !== PriceScaleMode.IndexedTo100) {
      return series.priceFormatter().format(price);
    }

    const logicalRange = this.visibleLogicalRange;

    if (!logicalRange) {
      return series.priceFormatter().format(price);
    }

    const firstVisibleData = series.dataByIndex(Math.ceil(logicalRange.from), MismatchDirection.NearestRight);
    const firstVisiblePrice = getDataPrice(firstVisibleData);

    if (firstVisiblePrice === null || firstVisiblePrice === 0) {
      return series.priceFormatter().format(price);
    }

    if (mode === PriceScaleMode.Percentage) {
      const percentage = ((price - firstVisiblePrice) / firstVisiblePrice) * 100;

      return `${percentage.toFixed(2)}%`;
    }

    return ((price / firstVisiblePrice) * 100).toFixed(2);
  }
}


####

import type { CanvasRenderingTarget2D } from 'fancy-canvas';
import {
  IPrimitivePaneRenderer,
  IPrimitivePaneView,
  ISeriesPrimitive,
  PrimitivePaneViewZOrder,
  SeriesAttachedParameter,
  Time,
} from 'lightweight-charts';

import { getThemeStore } from '@src/theme';

import { layoutPriceAxisLabels } from './layout';
import { LaidOutPriceAxisLabel, PriceAxisLabel } from './types';

const HORIZONTAL_PADDING = 6;
const SYMBOL_MIN_WIDTH_RATIO = 0.3;
const SYMBOL_MAX_WIDTH_RATIO = 0.48;
const FONT_SIZE = 11;
const FONT_WEIGHT = 500;

function getContrastTextColor(color: string): string {
  const normalizedColor = color.replace('#', '').slice(0, 6);

  if (normalizedColor.length !== 6) {
    return '#FFFFFF';
  }

  const red = Number.parseInt(normalizedColor.slice(0, 2), 16);
  const green = Number.parseInt(normalizedColor.slice(2, 4), 16);
  const blue = Number.parseInt(normalizedColor.slice(4, 6), 16);

  if (Number.isNaN(red) || Number.isNaN(green) || Number.isNaN(blue)) {
    return '#FFFFFF';
  }

  const luminance = (red * 0.299 + green * 0.587 + blue * 0.114) / 255;

  return luminance > 0.6 ? '#000000' : '#FFFFFF';
}

function fitText(context: CanvasRenderingContext2D, text: string, maxWidth: number): string {
  if (maxWidth <= 0) {
    return '';
  }

  if (context.measureText(text).width <= maxWidth) {
    return text;
  }

  const ellipsis = '…';
  let result = text;

  while (result.length > 0 && context.measureText(`${result}${ellipsis}`).width > maxWidth) {
    result = result.slice(0, -1);
  }

  return result.length > 0 ? `${result}${ellipsis}` : '';
}

function areLabelsEqual(currentLabels: readonly PriceAxisLabel[], nextLabels: readonly PriceAxisLabel[]): boolean {
  if (currentLabels.length !== nextLabels.length) {
    return false;
  }

  return currentLabels.every((currentLabel, index) => {
    const nextLabel = nextLabels[index];

    return (
      currentLabel.id === nextLabel.id &&
      currentLabel.collisionGroup === nextLabel.collisionGroup &&
      currentLabel.desiredCoordinate === nextLabel.desiredCoordinate &&
      currentLabel.text === nextLabel.text &&
      currentLabel.color === nextLabel.color &&
      currentLabel.style === nextLabel.style &&
      currentLabel.symbol === nextLabel.symbol &&
      currentLabel.priority === nextLabel.priority &&
      currentLabel.height === nextLabel.height
    );
  });
}

function drawLabel(
  context: CanvasRenderingContext2D,
  label: LaidOutPriceAxisLabel,
  width: number,
  horizontalPixelRatio: number,
  verticalPixelRatio: number,
): void {
  const { colors } = getThemeStore();
  const coordinate = Math.round(label.coordinate * verticalPixelRatio);
  const labelHeight = Math.round(label.height * verticalPixelRatio);
  const top = Math.round(coordinate - labelHeight / 2);
  const horizontalPadding = Math.round(HORIZONTAL_PADDING * horizontalPixelRatio);
  const backgroundColor = label.style === 'outlined' ? colors.chartBackground : label.color;
  const textColor = label.style === 'outlined' ? label.color : getContrastTextColor(label.color);

  context.fillStyle = backgroundColor;
  context.fillRect(0, top, width, labelHeight);

  if (label.style === 'outlined') {
    const borderWidth = Math.max(1, Math.round(horizontalPixelRatio));

    context.strokeStyle = label.color;
    context.lineWidth = borderWidth;
    context.strokeRect(
      borderWidth / 2,
      top + borderWidth / 2,
      Math.max(0, width - borderWidth),
      Math.max(0, labelHeight - borderWidth),
    );
  }

  context.fillStyle = textColor;

  if (!label.symbol) {
    const maxTextWidth = width - horizontalPadding * 2;
    const text = fitText(context, label.text, maxTextWidth);

    context.textAlign = 'center';
    context.fillText(text, width / 2, coordinate);
    return;
  }

  const availableWidth = width - horizontalPadding * 2;
  const measuredSymbolWidth = context.measureText(label.symbol).width + horizontalPadding * 2;
  const symbolWidth = Math.min(
    Math.max(measuredSymbolWidth, availableWidth * SYMBOL_MIN_WIDTH_RATIO),
    availableWidth * SYMBOL_MAX_WIDTH_RATIO,
  );
  const separatorX = Math.round(horizontalPadding + symbolWidth);
  const separatorWidth = Math.max(1, Math.round(horizontalPixelRatio));
  const symbolMaxWidth = symbolWidth - horizontalPadding * 2;
  const textAreaWidth = width - separatorX;
  const textMaxWidth = textAreaWidth - horizontalPadding * 2;
  const symbol = fitText(context, label.symbol, symbolMaxWidth);
  const text = fitText(context, label.text, textMaxWidth);

  context.textAlign = 'center';
  context.fillText(symbol, horizontalPadding + symbolWidth / 2, coordinate);

  context.globalAlpha = 0.5;
  context.fillRect(
    separatorX,
    top + Math.round(3 * verticalPixelRatio),
    separatorWidth,
    labelHeight - Math.round(6 * verticalPixelRatio),
  );
  context.globalAlpha = 1;

  context.fillText(text, separatorX + textAreaWidth / 2, coordinate);
}

class PriceAxisLabelsRenderer implements IPrimitivePaneRenderer {
  constructor(private readonly getLabels: () => readonly PriceAxisLabel[]) {}

  public draw(target: CanvasRenderingTarget2D): void {
    const labels = this.getLabels();

    if (labels.length === 0) {
      return;
    }

    target.useBitmapCoordinateSpace(({ context, bitmapSize, horizontalPixelRatio, verticalPixelRatio }) => {
      if (bitmapSize.width <= 0 || bitmapSize.height <= 0) {
        return;
      }

      const laidOutLabels = layoutPriceAxisLabels(labels, bitmapSize.height / verticalPixelRatio);

      if (laidOutLabels.length === 0) {
        return;
      }

      context.save();
      context.font = `${FONT_WEIGHT} ${Math.round(FONT_SIZE * verticalPixelRatio)}px Inter, sans-serif`;
      context.textBaseline = 'middle';

      laidOutLabels.forEach((label) => {
        drawLabel(context, label, bitmapSize.width, horizontalPixelRatio, verticalPixelRatio);
      });

      context.restore();
    });
  }
}

class PriceAxisLabelsPaneView implements IPrimitivePaneView {
  private readonly rendererInstance: PriceAxisLabelsRenderer;

  constructor(private readonly getLabels: () => readonly PriceAxisLabel[]) {
    this.rendererInstance = new PriceAxisLabelsRenderer(getLabels);
  }

  public renderer(): IPrimitivePaneRenderer | null {
    return this.getLabels().length > 0 ? this.rendererInstance : null;
  }

  public zOrder(): PrimitivePaneViewZOrder {
    return 'top';
  }
}

export class PriceAxisLabelsPrimitive implements ISeriesPrimitive<Time> {
  private readonly priceAxisPaneView: PriceAxisLabelsPaneView;
  private readonly priceAxisPaneViewList: readonly IPrimitivePaneView[];
  private labels: readonly PriceAxisLabel[] = [];
  private requestUpdate: (() => void) | null = null;

  constructor() {
    this.priceAxisPaneView = new PriceAxisLabelsPaneView(() => this.labels);
    this.priceAxisPaneViewList = [this.priceAxisPaneView];
  }

  public attached({ requestUpdate }: SeriesAttachedParameter<Time>): void {
    this.requestUpdate = requestUpdate;
    this.requestUpdate();
  }

  public detached(): void {
    this.requestUpdate = null;
  }

  public priceAxisPaneViews(): readonly IPrimitivePaneView[] {
    return this.priceAxisPaneViewList;
  }

  public updateAllViews(): void {}

  public setLabels(labels: readonly PriceAxisLabel[]): void {
    if (areLabelsEqual(this.labels, labels)) {
      return;
    }

    this.labels = labels;
    this.requestUpdate?.();
  }

  public clear(): void {
    if (this.labels.length === 0) {
      return;
    }

    this.labels = [];
    this.requestUpdate?.();
  }
}



#####

export const PRICE_AXIS_LABEL_HEIGHT = 20;

export type PriceAxisLabelStyle = 'filled' | 'outlined';

export interface PriceAxisLabel {
  id: string;
  collisionGroup: string;
  desiredCoordinate: number;
  text: string;
  color: string;
  style: PriceAxisLabelStyle;
  symbol?: string;
  priority?: number;
  height?: number;
}

export interface LaidOutPriceAxisLabel extends PriceAxisLabel {
  coordinate: number;
  height: number;
}

export interface PriceAxisLabelsLayoutOptions {
  gap?: number;
  duplicateTolerance?: number;
}



###


import {
  BarData,
  BarPrice,
  BarsInfo,
  Coordinate,
  CreatePriceLineOptions,
  CustomData,
  DataChangedHandler,
  DeepPartial,
  HistogramData,
  IChartApi,
  IPaneApi,
  IPriceFormatter,
  IPriceLine,
  IPriceScaleApi,
  IRange,
  ISeriesApi,
  ISeriesPrimitive,
  LineData,
  MismatchDirection,
  MouseEventParams,
  PriceScaleOptions,
  SeriesDataItemTypeMap,
  SeriesDefinition,
  SeriesOptionsMap,
  SeriesPartialOptionsMap,
  SeriesType,
  Time,
} from 'lightweight-charts';

import { BehaviorSubject, distinctUntilChanged, Observable, Subscription } from 'rxjs';

import { DataSource } from '@core/DataSource';
import { Indicator } from '@core/Indicator';
import { ChartTypeToCandleData, IndicatorDataFormatter } from '@core/Indicators';
import { Ohlc } from '@core/Legend';
import { MAIN_PANE_INDEX } from '@src/constants';

import { SeriesStrategies } from '@src/modules/series-strategies/SeriesFactory';
import { Candle, Direction } from '@src/types';
import { formatPrice, getPricePrecisionStep, isBarData, isLineData, normalizeSeriesData } from '@src/utils';

export interface SerieData {
  time: Time;
  customValues: Candle;
}

export interface CreateSeriesParams<TSeries extends SeriesType> {
  chart: IChartApi;
  seriesOptions?: SeriesPartialOptionsMap[TSeries];
  paneIndex?: number;
  priceScaleOptions?: DeepPartial<PriceScaleOptions>;
}

export interface IBaseSeries<TSeries extends SeriesType> extends ISeriesApi<TSeries> {
  getLwcSeries: () => ISeriesApi<TSeries>;
  getLegendData: (
    param?: MouseEventParams,
  ) => Partial<Record<keyof Ohlc, { value: number | string | Time; color: string; name: string }>>;
}

export interface BaseSeriesParams<TSeries extends SeriesType = SeriesType> {
  lwcChart: IChartApi;
  dataSource: DataSource;
  mainSymbol$: Observable<string>;
  mainSerie$: BehaviorSubject<SeriesStrategies | null>;
  customFormatter?: (params: IndicatorDataFormatter<TSeries>) => SeriesDataItemTypeMap<Time>[TSeries][];
  seriesOptions?: SeriesPartialOptionsMap[TSeries];
  priceScaleOptions?: DeepPartial<PriceScaleOptions>;
  showSymbolLabel?: boolean;
  paneIndex?: number;
  indicatorReference?: Indicator;
}

function applyMoscowTimezone(candles: Candle[]): ChartTypeToCandleData['Candlestick'][] {
  // todo this approach is too slow, for timezones impl we should shift timeScale instead of mutating the data
  const offsetMinutes = -180; // utc.time - moscow.time in minutes
  const secondsInMinute = 60;

  return candles
    .filter((c) => typeof c.time === 'number' && Number.isFinite(c.time))
    .map((c) => ({
      ...c,
      time: (c.time as number) - offsetMinutes * secondsInMinute,
    }));
}

export abstract class BaseSeries<TSeries extends SeriesType> implements IBaseSeries<TSeries> {
  protected lwcSeries: ISeriesApi<TSeries>;
  protected customFormatter:
    | undefined
    | ((params: IndicatorDataFormatter<TSeries>) => SeriesDataItemTypeMap<Time>[TSeries][]);

  protected lwcChart: IChartApi;
  protected mainSymbol$: Observable<string>;
  protected mainSerie$: BehaviorSubject<SeriesStrategies | null>;
  protected paneIndex: number | null = null;
  protected indicatorReference: Indicator | null = null;
  protected showSymbolLabel: boolean;

  private subscriptions = new Subscription();
  private dataSub: Subscription | null = null;
  private realtimeSub: Subscription | null = null;

  constructor({
    lwcChart,
    mainSymbol$,
    mainSerie$,
    customFormatter,
    seriesOptions,
    priceScaleOptions,
    showSymbolLabel = true,
    paneIndex,
    indicatorReference,
  }: BaseSeriesParams<TSeries>) {
    this.lwcSeries = this.createSeries({
      chart: lwcChart,
      seriesOptions,
      paneIndex,
      priceScaleOptions,
    });
    this.lwcChart = lwcChart;
    this.customFormatter = customFormatter;
    this.mainSymbol$ = mainSymbol$;
    this.mainSerie$ = mainSerie$;
    this.showSymbolLabel = showSymbolLabel;
    this.indicatorReference = indicatorReference ?? null;
  }

  public getLegendData = (
    param?: MouseEventParams,
  ): Partial<Record<keyof Ohlc, { value: number | string | Time; color: string; name: string }>> => {
    if (!param) {
      const seriesData = this.data();
      if (seriesData.length < 1) return {};

      const dataToFormat = seriesData[seriesData.length - 1];
      const prevBarData = seriesData.length > 1 ? seriesData[seriesData.length - 2] : null;
      return this.formatLegendValues(dataToFormat, prevBarData);
    }

    const dataToFormat = param?.seriesData.get(this.getLwcSeries()) ?? null;
    const prevBarData = this.dataByIndex(param.logical! - 1) ?? null;

    return this.formatLegendValues(dataToFormat, prevBarData);
  };

  public show(): void {
    this.lwcSeries.applyOptions({ ...this.lwcSeries.options(), visible: true });
  }

  public hide(): void {
    this.lwcSeries.applyOptions({ ...this.lwcSeries.options(), visible: false });
  }

  public isVisible(): boolean {
    return this.lwcSeries.options().visible;
  }

  public destroy(): void {
    this.dataSub?.unsubscribe();
    this.realtimeSub?.unsubscribe();
    this.subscriptions.unsubscribe();
    this.lwcChart.removeSeries(this.lwcSeries);
  }

  public getLwcSeries(): ISeriesApi<TSeries> {
    return this.lwcSeries;
  }

  public applyOptions(options: SeriesPartialOptionsMap[TSeries]): void {
    this.lwcSeries.applyOptions(options);
  }

  public attachPrimitive(primitive: ISeriesPrimitive<Time>): void {
    this.lwcSeries.attachPrimitive(primitive);
  }

  public barsInLogicalRange(range: IRange<number>): BarsInfo<Time> | null {
    return this.lwcSeries.barsInLogicalRange(range);
  }

  public coordinateToPrice(coordinate: number): BarPrice | null {
    return this.lwcSeries.coordinateToPrice(coordinate);
  }

  public createPriceLine(options: CreatePriceLineOptions): IPriceLine {
    return this.lwcSeries.createPriceLine(options);
  }

  public data(): readonly SeriesDataItemTypeMap<Time>[TSeries][] {
    return this.lwcSeries.data();
  }

  public dataByIndex(
    logicalIndex: number,
    mismatchDirection?: MismatchDirection,
  ): SeriesDataItemTypeMap<Time>[TSeries] | null {
    return this.lwcSeries.dataByIndex(logicalIndex, mismatchDirection);
  }

  public detachPrimitive(primitive: ISeriesPrimitive<Time>): void {
    this.lwcSeries.detachPrimitive(primitive);
  }

  public getPane(): IPaneApi<Time> {
    return this.lwcSeries.getPane();
  }

  public moveToPane(paneIndex: number): void {
    this.lwcSeries.moveToPane(paneIndex);
  }

  public options(): Readonly<SeriesOptionsMap[TSeries]> {
    return this.lwcSeries.options();
  }

  public priceFormatter(): IPriceFormatter {
    return this.lwcSeries.priceFormatter();
  }

  public priceLines(): IPriceLine[] {
    return this.lwcSeries.priceLines();
  }

  public priceScale(): IPriceScaleApi {
    return this.lwcSeries.priceScale();
  }

  public priceToCoordinate(price: number): Coordinate | null {
    return this.lwcSeries.priceToCoordinate(price);
  }

  public removePriceLine(line: IPriceLine): void {
    this.lwcSeries.removePriceLine(line);
  }

  public seriesOrder(): number {
    return this.lwcSeries.seriesOrder();
  }

  public seriesType(): TSeries {
    return this.lwcSeries.seriesType();
  }

  public setData(data: SeriesDataItemTypeMap<Time>[TSeries][]): void {
    const normalizedData = normalizeSeriesData(data);
    this.lwcSeries.setData(normalizedData);
  }

  public setSeriesOrder(order: number): void {
    this.lwcSeries.setSeriesOrder(order);
  }

  public subscribeDataChanged(handler: DataChangedHandler): void {
    this.lwcSeries.subscribeDataChanged(handler);
  }

  public unsubscribeDataChanged(handler: DataChangedHandler): void {
    this.lwcSeries.unsubscribeDataChanged(handler);
  }

  public update(bar: SeriesDataItemTypeMap<Time>[TSeries], historicalUpdate?: boolean): void {
    const data = this.lwcSeries.data();
    const last = data.length ? data[data.length - 1] : null;

    if (!last) {
      this.lwcSeries.update(bar, false);
      return;
    }

    const lastTime = last.time;
    const nextTime = bar.time;

    const isHist =
      historicalUpdate ?? (typeof lastTime === 'number' && typeof nextTime === 'number' && nextTime < lastTime);

    this.lwcSeries.update(bar, isHist);
  }

  protected createSeries({
    chart,
    seriesOptions,
    paneIndex = MAIN_PANE_INDEX,
    priceScaleOptions = {},
  }: CreateSeriesParams<TSeries>): ISeriesApi<TSeries> {
    this.paneIndex = paneIndex;

    const defaultOptions = this.getDefaultOptions();
    const mergedOptions = {
      ...defaultOptions,
      ...seriesOptions,
    };

    const series = chart.addSeries<TSeries>(this.seriesDefinition(), mergedOptions, paneIndex);

    chart.priceScale(mergedOptions.priceScaleId ?? Direction.Right, paneIndex).applyOptions(priceScaleOptions);

    return series;
  }

  protected abstract dataSourceSubscription(next: Candle[]): void;
  protected abstract seriesDefinition(): SeriesDefinition<TSeries>;
  protected abstract dataSourceRealtimeSubscription(next: Candle): void;
  protected abstract getDefaultOptions(): SeriesPartialOptionsMap[TSeries];
  protected abstract formatMainSerie(inputData: Candle[]): SeriesDataItemTypeMap<Time>[TSeries][];
  protected abstract formatLegendValues(
    currentBar: null | BarData | LineData | HistogramData | CustomData,
    prevBar: null | BarData | LineData | HistogramData | CustomData,
  ): Partial<Record<keyof Ohlc, { value: number | string | Time; color: string; name: string }>>;

  protected applyTimezone(data: Candle[]): Candle[] {
    return applyMoscowTimezone(data);
  }

  protected formatData(inputData: Candle[]): SeriesDataItemTypeMap<Time>[TSeries][] {
    const formatter = this.customFormatter;

    const data = this.applyTimezone(inputData);

    if (formatter) {
      const mainSeriesData = (this.mainSerie$.value?.data() ?? []) as unknown as SerieData[];

      if (data.length === 1) {
        return formatter({
          mainSeriesData,
          selfData: this.data() as unknown as ChartTypeToCandleData[TSeries][],
          candle: this.formatMainSerie(data)[0] as unknown as SerieData,
          indicatorReference: this.indicatorReference ?? undefined,
        });
      }

      return formatter({
        mainSeriesData,
        indicatorReference: this.indicatorReference ?? undefined,
        selfData: this.data() as unknown as ChartTypeToCandleData[TSeries][],
      });
    }

    return this.formatMainSerie(data);
  }

  protected subscribeDataSource = (dataSource: DataSource): void => {
    const minMove = getPricePrecisionStep();

    this.subscriptions.add(
      this.mainSymbol$.pipe(distinctUntilChanged()).subscribe((symbol) => {
        this.lwcSeries.applyOptions({
          // todo: на каждый апдейт dataSource сеттим options. Не оптимально
          title: this.showSymbolLabel ? symbol : '',
          priceFormat: {
            type: 'custom',
            minMove,
            formatter: (price: number) => formatPrice(price),
          },
        });

        this.dataSub?.unsubscribe();
        this.realtimeSub?.unsubscribe();

        this.dataSub = dataSource.subscribe(symbol, (next) => {
          this.dataSourceSubscription(next);
        });

        this.realtimeSub = dataSource.subscribeRealtime(symbol, (next: Candle) => {
          this.dataSourceRealtimeSubscription(next);
        });
      }),
    );
  };
}

export function calcCandleChange(
  prev: BarData | LineData | HistogramData | CustomData | null,
  current: BarData | LineData | HistogramData | CustomData | null,
): (Ohlc & { customValues?: Record<string, any> }) | null {
  if (!current) {
    return null;
  }

  if (!prev) {
    return current;
  }

  if (isBarData(prev) && isBarData(current)) {
    const absoluteChange = current.close - prev.close;
    const percentageChange = ((current.close - prev.close) / prev.close) * 100;

    return {
      ...current,
      absoluteChange,
      percentageChange,
    };
  }

  if (isLineData(prev) && isLineData(current)) {
    const absoluteChange = current.value - prev.value;
    const percentageChange = ((current.value - prev.value) / prev.value) * 100;

    return {
      time: current.time,
      value: current.value,
      high: current.customValues?.high as number,
      low: current.customValues?.low as number,
      absoluteChange,
      percentageChange,
      customValues: current.customValues,
    };
  }

  return null;
}



####

import dayjs from 'dayjs';

import {
  BarPrice,
  ChartOptions,
  createChart,
  CrosshairMode,
  DeepPartial,
  IChartApi,
  IRange,
  LocalizationOptionsBase,
  LogicalRange,
  Time,
  UTCTimestamp,
} from 'lightweight-charts';

import flatten from 'lodash-es/flatten';
import { BehaviorSubject, combineLatest, Observable, Subscription } from 'rxjs';
import { map, withLatestFrom } from 'rxjs/operators';

import { ChartMouseEvents } from '@core/ChartMouseEvents';
import { DataSource } from '@core/DataSource';
import { DOMModel } from '@core/DOMModel';
import { DrawingsManager } from '@core/DrawingsManager';
import { EventManager } from '@core/EventManager';
import { IndicatorManager } from '@core/IndicatorManager';
import { ModalRenderer } from '@core/ModalRenderer';
import { PaneManager } from '@core/PaneManager';
import { PriceAxisLabelsController } from '@core/PriceAxisLabels';
import { CompareManager } from '@src/core/CompareManager';
import { SeriesStrategies } from '@src/modules/series-strategies/SeriesFactory';
import { getThemeStore } from '@src/theme/store';
import { ThemeKey, ThemeMode } from '@src/theme/types';
import { getLocale } from '@src/translations';
import {
  Candle,
  ChartOptionsModel,
  ChartSeriesType,
  ChartTypeOptions,
  Direction,
  OHLCConfig,
  TooltipConfig,
} from '@src/types';
import { Defaults } from '@src/types/defaults';
import { DayjsOffset, Intervals, intervalsToDayjs } from '@src/types/intervals';

import { ChartSnapshot, ISerializable, PaneSnapshot } from '@src/types/snapshot';
import { formatCompactNumber } from '@src/utils';
import { createTickMarkFormatter, formatDate } from '@src/utils/formatter';

export interface ChartConfig extends Partial<ChartOptionsModel> {
  container: HTMLElement;
  seriesTypes: ChartSeriesType[];
  theme: ThemeKey;
  mode?: ThemeMode;
  chartOptions?: ChartTypeOptions;
  localization?: LocalizationOptionsBase;
}

export enum Resize {
  Shrink,
  Expand,
}

const HISTORY_LOAD_THRESHOLD = 50;

interface ChartParams {
  params: {
    dataSource: DataSource;
    eventManager: EventManager;
    modalRenderer: ModalRenderer;
    ohlcConfig: OHLCConfig;
    tooltipConfig: TooltipConfig;
    panes: PaneSnapshot[];
  };
  lwcChartConfig: ChartConfig;
}

/**
 * Абстракция над библиотекой для построения графиков
 */
export class Chart implements ISerializable<ChartSnapshot> {
  private lwcChart!: IChartApi;
  private container: HTMLElement;
  private eventManager: EventManager;
  private paneManager!: PaneManager;
  private compareManager: CompareManager;
  private mouseEvents: ChartMouseEvents;
  private indicatorManager: IndicatorManager;
  private priceAxisLabelsController: PriceAxisLabelsController;
  private optionsSubscription: Subscription;
  private dataSource: DataSource;
  private chartConfig: Omit<ChartConfig, 'theme' | 'mode'>;
  private mainSeries!: BehaviorSubject<SeriesStrategies | null>; // Main Series. Exists in a single copy
  private DOM: DOMModel;

  private isPointerDown = false;
  private didResetOnDrag = false;

  private subscriptions = new Subscription();

  private currentInterval: Intervals | null = null;

  private activeSymbols: string[] = [];

  private historyBatchRunning = false;

  constructor({ params, lwcChartConfig }: ChartParams) {
    const { eventManager, dataSource, modalRenderer, ohlcConfig, tooltipConfig, panes: panesSnapshot } = params;

    this.eventManager = eventManager;
    this.dataSource = dataSource;
    this.container = lwcChartConfig.container;
    this.chartConfig = lwcChartConfig;

    this.lwcChart = createChart(this.container, getOptions(lwcChartConfig));

    this.optionsSubscription = this.eventManager
      .getChartOptionsModel()
      .subscribe(({ dateFormat, timeFormat, showTime }) => {
        const configToApply = { ...lwcChartConfig, dateFormat, timeFormat, showTime };

        this.lwcChart.applyOptions({
          ...getOptions(configToApply),
          localization: {
            timeFormatter: (time: UTCTimestamp) => formatDate(time, dateFormat, timeFormat, showTime),
          },
        });
      });

    this.subscriptions.add(this.optionsSubscription);

    this.mouseEvents = new ChartMouseEvents({ lwcChart: this.lwcChart, container: this.container });

    this.mouseEvents.subscribe('wheel', this.onWheel);
    this.mouseEvents.subscribe('pointerDown', this.onPointerDown);
    this.mouseEvents.subscribe('pointerMove', this.onPointerMove);
    this.mouseEvents.subscribe('pointerUp', this.onPointerUp);
    this.mouseEvents.subscribe('pointerCancel', this.onPointerUp);

    this.DOM = new DOMModel({ modalRenderer });

    this.paneManager = new PaneManager({
      eventManager: this.eventManager,
      panesSnapshot,
      lwcChart: this.lwcChart,
      dataSource,
      DOM: this.DOM,
      ohlcConfig,
      subscribeChartEvent: this.subscribeChartEvent,
      chartContainer: this.container,
      tooltipConfig,
      modalRenderer,
    });

    this.mainSeries = this.paneManager.getMainPane().getMainSerie();

    this.indicatorManager = new IndicatorManager({
      eventManager,
      initialIndicators: flatten(
        panesSnapshot.map((pane) => pane.indicators.map((ind) => ({ ...ind, paneId: pane.id }))),
      ),
      DOM: this.DOM,
      dataSource: this.dataSource,
      lwcChart: this.lwcChart,
      paneManager: this.paneManager,
      chartOptions: lwcChartConfig.chartOptions,
    });

    this.compareManager = new CompareManager({
      chart: this.lwcChart,
      initialIndicators: flatten(
        panesSnapshot.map((pane) => pane.indicators.map((ind) => ({ ...ind, paneId: pane.id }))),
      ),
      eventManager: this.eventManager,
      dataSource: this.dataSource,
      indicatorManager: this.indicatorManager,
      paneManager: this.paneManager,
    });

    this.priceAxisLabelsController = new PriceAxisLabelsController({
      mainSeries$: this.mainSeries.asObservable(),
      mainSymbol$: this.eventManager.symbol(),
      compareEntities$: this.compareManager.entities(),
      indicatorEntities$: this.indicatorManager.entities(),
    });

    this.priceAxisLabelsController.setVisibleLogicalRange(this.lwcChart.timeScale().getVisibleLogicalRange());

    this.setupDataSourceSubs();
    this.setupHistoricalDataLoading();
  }

  public getPriceScaleWidth(direction: Direction): number {
    try {
      const priceScale = this.lwcChart.priceScale(direction);

      return priceScale ? priceScale.width() : 0;
    } catch {
      return 0;
    }
  }

  public getDrawingsManager = (): DrawingsManager => {
    return this.paneManager.getDrawingsManager();
  };

  public getIndicatorManager = (): IndicatorManager => {
    return this.indicatorManager;
  };

  private onWheel = () => {
    this.eventManager.resetInterval({ history: false });
  };

  private onPointerDown = () => {
    this.isPointerDown = true;
    this.didResetOnDrag = false;
  };

  private onPointerMove = () => {
    if (!this.isPointerDown) return;
    if (this.didResetOnDrag) return;

    this.didResetOnDrag = true;
    this.eventManager.resetInterval({ history: false });
  };

  private onPointerUp = () => {
    this.isPointerDown = false;
  };

  public getDom(): DOMModel {
    return this.DOM;
  }

  public getMainSeries(): Observable<SeriesStrategies | null> {
    return this.mainSeries.asObservable();
  }

  public getCompareManager(): CompareManager {
    return this.compareManager;
  }

  public updateTheme(theme: ThemeKey, mode: ThemeMode) {
    this.lwcChart.applyOptions(getOptions({ ...this.chartConfig, theme, mode }));
    this.priceAxisLabelsController.invalidate();
  }

  public destroy(): void {
    this.priceAxisLabelsController.destroy();
    this.mouseEvents.destroy();
    this.compareManager.clear();
    this.subscriptions.unsubscribe();
    this.lwcChart.remove();
  }

  public subscribeChartEvent: ChartMouseEvents['subscribe'] = (event, callback) =>
    this.mouseEvents.subscribe(event, callback);

  public unsubscribeChartEvent: ChartMouseEvents['unsubscribe'] = (event, callback) => {
    this.mouseEvents.unsubscribe(event, callback);
  };

  // todo: add/move to undo/redo model(eventManager)
  public scrollTimeScale = (direction: Direction) => {
    this.eventManager.resetInterval({ history: false });
    const diff = direction === Direction.Left ? -2 : 2;
    const currentPosition = this.lwcChart.timeScale().scrollPosition();
    this.lwcChart.timeScale().scrollToPosition(currentPosition + diff, false);
  };

  // todo: add/move to undo/redo model(eventManager)
  public zoomTimeScale = (resize: Resize) => {
    this.eventManager.resetInterval({ history: false });
    const diff = resize === Resize.Shrink ? -1 : 1;

    const currentRange = this.lwcChart.timeScale().getVisibleRange();
    if (!currentRange) return;

    const { from, to } = currentRange as IRange<number>;
    if (!from || !to) return;

    const next: IRange<Time> = {
      from: (from + (to - from) * 0.1 * diff) as Time,
      to: to as Time,
    };
    this.lwcChart.timeScale().setVisibleRange(next);
  };

  // todo: add to undo/redo model(eventManager)
  public resetZoom = () => {
    this.eventManager.resetInterval({ history: false });
    this.lwcChart.timeScale().resetTimeScale();
    this.lwcChart.priceScale(Direction.Right).setAutoScale(true);
    this.lwcChart.priceScale(Direction.Left).setAutoScale(true);
  };

  public getRealtimeApi() {
    return {
      getTimeframe: () => this.eventManager.getTimeframe(),
      getSymbols: () => this.activeSymbols,
      update: (symbol: string, candle: Candle) => {
        this.dataSource.updateRealtime(symbol, candle);
      },
    };
  }

  public getSnapshot(): ChartSnapshot {
    return {
      panes: this.paneManager.getSnapshot(),
      chartSeriesType: this.eventManager.exportChartSettings().seriesSelected,
      timeframe: this.eventManager.exportChartSettings().timeframe,
      symbol: this.activeSymbols[0],
    };
  }

  private scheduleHistoryBatch = () => {
    if (this.historyBatchRunning) return;

    this.historyBatchRunning = true;

    requestAnimationFrame(() => {
      const symbols = this.activeSymbols.slice();

      Promise.all(symbols.map((s) => this.dataSource.loadMoreHistory(s))).finally(() => {
        this.historyBatchRunning = false;

        const range = this.lwcChart.timeScale().getVisibleLogicalRange();
        if (range && range.from < HISTORY_LOAD_THRESHOLD) {
          this.scheduleHistoryBatch();
        }
      });
    });
  };

  private setupDataSourceSubs() {
    const getWarmupFrom = (): number => {
      if (this.currentInterval && this.currentInterval !== Intervals.All) {
        return getIntervalRange(this.currentInterval).from;
      }

      const range = this.lwcChart.timeScale().getVisibleRange();
      if (!range) return 0;

      const { from } = range as IRange<number>;
      return from as number;
    };

    const warmupSymbols = (symbols: string[]) => {
      if (!symbols.length) return;

      const from = getWarmupFrom();
      if (!from) return;

      Promise.all(symbols.map((symbol) => this.dataSource.loadTill(symbol, from))).catch((error) => {
        console.error('[Chart] Ошибка при прогреве символов:', error);
      });
    };
    const symbols$ = combineLatest([this.eventManager.symbol(), this.compareManager.itemsObs()]).pipe(
      map(([main, items]) => Array.from(new Set([main, ...items.map((i) => i.symbol)]))),
    );

    this.subscriptions.add(
      this.eventManager
        .getInterval()
        .pipe(withLatestFrom(symbols$))
        .subscribe(([interval, symbols]) => {
          this.currentInterval = interval;

          if (!interval) return;

          if (interval === Intervals.All) {
            Promise.all(symbols.map((s) => this.dataSource.loadAllHistory(s)))
              .then(() => {
                requestAnimationFrame(() => this.lwcChart.timeScale().fitContent());
              })
              .catch((error) => console.error('[Chart] Ошибка при загрузке всей истории:', error));

            return;
          }

          const { from, to } = getIntervalRange(interval);

          Promise.all(symbols.map((s) => this.dataSource.loadTill(s, from)))
            .then(() => {
              this.lwcChart.timeScale().setVisibleRange({ from: from as Time, to: to as Time });
            })
            .catch((error) => {
              console.error('[Chart] Ошибка при применении интервала:', error);
            });
        }),
    );

    this.subscriptions.add(
      symbols$.subscribe((symbols) => {
        const prevSymbols = this.activeSymbols;
        this.activeSymbols = symbols;

        this.dataSource.setSymbols(symbols);

        const prevSet = new Set(prevSymbols);
        const added: string[] = [];

        for (let i = 0; i < symbols.length; i += 1) {
          const s = symbols[i];
          if (!s) continue;
          if (prevSet.has(s)) continue;
          added.push(s);
        }

        if (added.length) {
          warmupSymbols(added);
        }
      }),
    );

    this.subscriptions.add(
      combineLatest([
        this.eventManager.symbol(),
        this.compareManager.itemsObs(),
        this.mainSeries.asObservable(),
      ]).subscribe(([main, items, serie]) => {
        if (!serie) return;

        const title = items.length ? main : '';
        serie.getLwcSeries().applyOptions({ title });
      }),
    );
  }

  private setupHistoricalDataLoading(): void {
    // todo (не)вызвать loadMoreHistory после проверки на необходимость дозагрузки после смены таймфрейма
    this.mouseEvents.subscribe('visibleLogicalRangeChange', (logicalRange: LogicalRange | null) => {
      this.priceAxisLabelsController.setVisibleLogicalRange(logicalRange);

      if (!logicalRange) return;
      if (this.currentInterval === Intervals.All) return;

      const needsMoreData = logicalRange.from < HISTORY_LOAD_THRESHOLD;
      if (!needsMoreData) return;

      this.scheduleHistoryBatch();
    });
  }
}

function getIntervalRange(interval: Intervals): { from: number; to: number } {
  const { value, unit } = intervalsToDayjs[interval] as DayjsOffset;

  const from = Math.floor(dayjs().subtract(value, unit).valueOf() / 1000);
  const to = Math.floor(dayjs().valueOf() / 1000);

  return { from, to };
}

function getOptions(config: ChartConfig): DeepPartial<ChartOptions> {
  const timeFormat = config.timeFormat ?? Defaults.timeFormat;
  const showTime = config.showTime ?? Defaults.showTime;

  const use12HourFormat = timeFormat === '12h';
  const timeFormatString = use12HourFormat ? 'h:mm A' : 'HH:mm';

  const { colors } = getThemeStore();

  const localization: LocalizationOptionsBase = {
    locale: getLocale(),
    priceFormatter: (priceValue: BarPrice) => {
      return formatCompactNumber(priceValue);
    },
  };

  return {
    width: config.container.clientWidth,
    height: config.container.clientHeight,
    autoSize: true,
    layout: {
      background: { color: colors.chartBackground },
      textColor: colors.chartTextPrimary,
    },
    grid: {
      vertLines: { color: colors.chartGridLine },
      horzLines: { color: colors.chartGridLine },
    },
    crosshair: {
      mode: CrosshairMode.Normal,
      vertLine: { color: colors.chartCrosshairLine, labelBackgroundColor: colors.chartCrosshairLabel, style: 0 },
      horzLine: { color: colors.chartCrosshairLine, labelBackgroundColor: colors.chartCrosshairLabel, style: 2 },
    },
    timeScale: {
      timeVisible: showTime,
      secondsVisible: false,
      tickMarkFormatter: createTickMarkFormatter(timeFormatString),
      borderVisible: false,
      allowBoldLabels: false,
      rightOffset: 25,
    },
    rightPriceScale: {
      textColor: colors.chartTextPrimary,
      borderVisible: false,
    },
    localization,
  };
}