---

import {
  AutoscaleInfo,
  CrosshairMode,
  IChartApi,
  IPrimitivePaneView,
  Logical,
  PrimitiveHoveredItem,
  SeriesAttachedParameter,
  SeriesOptionsMap,
  Time,
  UTCTimestamp,
} from 'lightweight-charts';
import { Observable, Subscription } from 'rxjs';

import { CustomPriceAxisView, CustomTimeAxisView } from '@core/Drawings/axis';
import {
  getPointerPoint as getPointerPointFromEvent,
  getPriceFromYCoordinate,
  getTimeFromXCoordinate,
  getXCoordinateFromTime,
  getYCoordinateFromPrice,
  isNearPoint,
} from '@core/Drawings/helpers';
import { updateViews } from '@core/Drawings/utils';

import { getThemeStore } from '@src/theme';
import { Defaults } from '@src/types/defaults';
import { formatPrice } from '@src/utils';
import { formatDate } from '@src/utils/formatter';

import { AxisLinePaneView } from './paneView';

import type { ISeriesDrawing } from '@core/Drawings/common';
import type { AxisLabel, Point, SeriesApi } from '@core/Drawings/types';
import type { ChartOptionsModel } from '@src/types';

export type AxisLineDirection = 'vertical' | 'horizontal';

type AxisLineMode = 'idle' | 'ready' | 'dragging';

interface AxisLineParams {
  direction: AxisLineDirection;
  container: HTMLElement;
  formatObservable?: Observable<ChartOptionsModel>;
  removeSelf?: () => void;
}

interface AxisLineState {
  hidden: boolean;
  isActive: boolean;
  mode: AxisLineMode;
  time: Time | null;
  price: number | null;
}

export interface AxisLineRenderData {
  direction: AxisLineDirection;
  coordinate: number;
  handle: Point;
  showHandle: boolean;
}

const HANDLE_HIT_TOLERANCE = 8;
const LINE_HIT_TOLERANCE = 6;

const { colors } = getThemeStore();

export class AxisLine implements ISeriesDrawing {
  private chart: IChartApi;
  private series: SeriesApi;
  private container: HTMLElement;
  private removeSelf?: () => void;

  private requestUpdate: (() => void) | null = null;
  private subscriptions = new Subscription();
  private isBound = false;

  private hidden = false;
  private isActive = false;
  private mode: AxisLineMode = 'idle';

  private direction: AxisLineDirection;
  private time: Time | null = null;
  private price: number | null = null;
  private dragPointerId: number | null = null;

  private displayFormat: ChartOptionsModel = {
    dateFormat: Defaults.dateFormat,
    timeFormat: Defaults.timeFormat,
    showTime: Defaults.showTime,
  };

  private readonly paneView: AxisLinePaneView;
  private readonly timeAxisView: CustomTimeAxisView;
  private readonly priceAxisView: CustomPriceAxisView;

  constructor(
    chart: IChartApi,
    series: SeriesApi,
    { direction, container, formatObservable, removeSelf }: AxisLineParams,
  ) {
    this.chart = chart;
    this.series = series;
    this.direction = direction;
    this.container = container;
    this.removeSelf = removeSelf;

    this.paneView = new AxisLinePaneView(this);

    this.timeAxisView = new CustomTimeAxisView({
      getAxisLabel: (kind) => this.getTimeAxisLabel(kind),
      labelKind: 'main',
    });

    this.priceAxisView = new CustomPriceAxisView({
      getAxisLabel: (kind) => this.getPriceAxisLabel(kind),
      labelKind: 'main',
    });

    if (formatObservable) {
      this.subscriptions.add(
        formatObservable.subscribe((format) => {
          this.displayFormat = format;
          this.render();
        }),
      );
    }

    this.series.attachPrimitive(this);
  }

  public show(): void {
    this.hidden = false;
    this.render();
  }

  public hide(): void {
    this.hidden = true;
    this.showCrosshair();
    this.render();
  }

  public destroy(): void {
    this.showCrosshair();
    this.unbindEvents();
    this.subscriptions.unsubscribe();
    this.series.detachPrimitive(this);
    this.requestUpdate = null;
  }

  public rebind(series: SeriesApi): void {
    if (this.series === series) {
      return;
    }

    this.showCrosshair();
    this.unbindEvents();
    this.series.detachPrimitive(this);

    this.series = series;
    this.requestUpdate = null;

    this.series.attachPrimitive(this);
    this.render();
  }

  public getState(): AxisLineState {
    return {
      hidden: this.hidden,
      isActive: this.isActive,
      mode: this.mode,
      time: this.time,
      price: this.price,
    };
  }

  public setState(state: unknown): void {
    const nextState = state as Partial<AxisLineState>;

    if ('hidden' in nextState && typeof nextState.hidden === 'boolean') {
      this.hidden = nextState.hidden;
    }

    if ('isActive' in nextState && typeof nextState.isActive === 'boolean') {
      this.isActive = nextState.isActive;
    }

    if ('mode' in nextState && nextState.mode) {
      this.mode = nextState.mode;
    }

    if ('time' in nextState) {
      this.time = nextState.time ?? null;
    }

    if ('price' in nextState) {
      this.price = nextState.price ?? null;
    }

    this.render();
  }

  public attached(param: SeriesAttachedParameter<Time, keyof SeriesOptionsMap>): void {
    this.requestUpdate = param.requestUpdate;
    this.bindEvents();
  }

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

  public updateAllViews(): void {
    updateViews([this.paneView, this.timeAxisView, this.priceAxisView]);
  }

  public paneViews(): readonly IPrimitivePaneView[] {
    return [this.paneView];
  }

  public timeAxisViews() {
    return this.direction === 'vertical' ? [this.timeAxisView] : [];
  }

  public priceAxisViews() {
    return this.direction === 'horizontal' ? [this.priceAxisView] : [];
  }

  public autoscaleInfo(_start: Logical, _end: Logical): AutoscaleInfo | null {
    return null;
  }

  public getRenderData(): AxisLineRenderData | null {
    if (this.hidden) {
      return null;
    }

    const coordinate = this.getCoordinate();

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

    const { width, height } = this.container.getBoundingClientRect();

    return {
      direction: this.direction,
      coordinate,
      handle: this.direction === 'vertical' ? { x: coordinate, y: height / 2 } : { x: width / 2, y: coordinate },
      showHandle: this.isActive,
    };
  }

  public hitTest(x: number, y: number): PrimitiveHoveredItem | null {
    if (this.hidden || this.mode === 'idle') {
      return null;
    }

    const point = { x, y };
    const data = this.getRenderData();

    if (!data) {
      return null;
    }

    if (this.isActive && isNearPoint(point, data.handle.x, data.handle.y, HANDLE_HIT_TOLERANCE)) {
      return {
        cursorStyle: this.getCursorStyle(),
        externalId: 'axis-line',
        zOrder: 'top',
      };
    }

    if (!this.isPointNearLine(point, data.coordinate)) {
      return null;
    }

    return {
      cursorStyle: this.getCursorStyle(),
      externalId: 'axis-line',
      zOrder: 'top',
    };
  }

  public getTimeAxisLabel(kind: string): AxisLabel | null {
    if (kind !== 'main' || this.direction !== 'vertical' || !this.isActive || this.time === null) {
      return null;
    }

    const coordinate = getXCoordinateFromTime(this.chart, this.time);

    if (coordinate === null || typeof this.time !== 'number') {
      return null;
    }

    return {
      coordinate,
      text: formatDate(
        this.time as UTCTimestamp,
        this.displayFormat.dateFormat,
        this.displayFormat.timeFormat,
        this.displayFormat.showTime,
      ),
      textColor: colors.chartPriceLineText,
      backgroundColor: colors.axisMarkerLabelFill,
    };
  }

  public getPriceAxisLabel(kind: string): AxisLabel | null {
    if (kind !== 'main' || this.direction !== 'horizontal' || !this.isActive || this.price === null) {
      return null;
    }

    const coordinate = getYCoordinateFromPrice(this.series, this.price);

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

    return {
      coordinate,
      text: formatPrice(this.price) ?? '',
      textColor: colors.chartPriceLineText,
      backgroundColor: colors.axisMarkerLabelFill,
    };
  }

  private bindEvents(): void {
    if (this.isBound) {
      return;
    }

    this.isBound = true;

    this.container.addEventListener('pointerdown', this.handlePointerDown);
    window.addEventListener('pointermove', this.handlePointerMove);
    window.addEventListener('pointerup', this.handlePointerUp);
    window.addEventListener('pointercancel', this.handlePointerUp);
  }

  private unbindEvents(): void {
    if (!this.isBound) {
      return;
    }

    this.isBound = false;

    this.container.removeEventListener('pointerdown', this.handlePointerDown);
    window.removeEventListener('pointermove', this.handlePointerMove);
    window.removeEventListener('pointerup', this.handlePointerUp);
    window.removeEventListener('pointercancel', this.handlePointerUp);
  }

  private handlePointerDown = (event: PointerEvent): void => {
    if (this.hidden || event.button !== 0) {
      return;
    }

    const point = this.getEventPoint(event);

    if (this.mode === 'idle') {
      event.preventDefault();
      event.stopPropagation();

      this.updateLine(point);
      this.isActive = true;
      this.mode = 'ready';
      this.render();
      return;
    }

    if (this.mode !== 'ready') {
      return;
    }

    const data = this.getRenderData();

    if (!data) {
      return;
    }

    const isNearHandle = this.isActive && isNearPoint(point, data.handle.x, data.handle.y, HANDLE_HIT_TOLERANCE);
    const isNearLine = this.isPointNearLine(point, data.coordinate);

    if (!this.isActive) {
      if (!isNearLine) {
        return;
      }

      event.preventDefault();
      event.stopPropagation();

      this.isActive = true;
      this.render();
      return;
    }

    if (!isNearHandle && !isNearLine) {
      this.isActive = false;
      this.render();
      return;
    }

    event.preventDefault();
    event.stopPropagation();

    this.mode = 'dragging';
    this.dragPointerId = event.pointerId;
    this.hideCrosshair();
    this.render();
  };

  private handlePointerMove = (event: PointerEvent): void => {
    if (this.mode !== 'dragging' || this.dragPointerId !== event.pointerId) {
      return;
    }

    event.preventDefault();
    event.stopPropagation();

    this.updateLine(this.getEventPoint(event));
    this.render();
  };

  private handlePointerUp = (event: PointerEvent): void => {
    if (this.mode !== 'dragging' || this.dragPointerId !== event.pointerId) {
      return;
    }

    this.mode = 'ready';
    this.dragPointerId = null;
    this.showCrosshair();
    this.render();
  };

  private updateLine(point: Point): void {
    if (this.direction === 'vertical') {
      this.time = getTimeFromXCoordinate(this.chart, point.x);
      return;
    }

    this.price = getPriceFromYCoordinate(this.series, point.y);
  }

  private getCoordinate(): number | null {
    if (this.direction === 'vertical') {
      if (this.time === null) {
        return null;
      }

      const coordinate = getXCoordinateFromTime(this.chart, this.time);
      return coordinate === null ? null : Number(coordinate);
    }

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

    const coordinate = getYCoordinateFromPrice(this.series, this.price);
    return coordinate === null ? null : Number(coordinate);
  }

  private isPointNearLine(point: Point, coordinate: number): boolean {
    return this.direction === 'vertical'
      ? Math.abs(point.x - coordinate) <= LINE_HIT_TOLERANCE
      : Math.abs(point.y - coordinate) <= LINE_HIT_TOLERANCE;
  }

  private getCursorStyle(): PrimitiveHoveredItem['cursorStyle'] {
    return this.direction === 'vertical' ? 'ew-resize' : 'ns-resize';
  }

  private hideCrosshair(): void {
    this.chart.applyOptions({
      crosshair: {
        mode: CrosshairMode.Hidden,
      },
    });
  }

  private showCrosshair(): void {
    this.chart.applyOptions({
      crosshair: {
        mode: CrosshairMode.Normal,
      },
    });
  }

  private getEventPoint(event: PointerEvent): Point {
    return getPointerPointFromEvent(this.container, event);
  }

  private render(): void {
    this.updateAllViews();
    this.requestUpdate?.();
  }
}



import { Observable, Subscription } from 'rxjs';

import {
  CustomPriceAxisPaneView,
  CustomPriceAxisView,
  CustomTimeAxisPaneView,
  CustomTimeAxisView,
} from '@core/Drawings/axis';
import {
  clamp,
  clampPointToContainer as clampPointToContainerInElement,
  getAnchorFromPoint,
  getContainerSize as getElementContainerSize,
  getPointerPoint as getPointerPointFromEvent,
  getXCoordinateFromTime,
  getYCoordinateFromPrice,
  isNearPoint,
  isPointInBounds,
} from '@core/Drawings/helpers';
import { updateViews } from '@core/Drawings/utils';

import { getThemeStore } from '@src/theme';
import { Defaults } from '@src/types/defaults';
import { formatPercent, formatPrice, formatSignedNumber, formatVolume } from '@src/utils';
import { formatDate } from '@src/utils/formatter';

import { DiapsonPaneView } from './paneView';

import type { ISeriesDrawing } from '@core/Drawings/common';
import type { Anchor, AxisLabel, AxisSegment, Point, SeriesApi } from '@core/Drawings/types';
import type { ChartOptionsModel } from '@src/types';
import type {
  AutoscaleInfo,
  IChartApi,
  IPrimitivePaneView,
  Logical,
  PrimitiveHoveredItem,
  SeriesAttachedParameter,
  SeriesOptionsMap,
  Time,
  UTCTimestamp,
} from 'lightweight-charts';

export type DiapsonRangeMode = 'date' | 'price';

type InteractionMode = 'idle' | 'drawing' | 'ready' | 'dragging';
type DiapsonHandle = 'body' | 'start' | 'end' | null;
type TimeLabelKind = 'left' | 'right';
type PriceLabelKind = 'top' | 'bottom';

interface DiapsonParams {
  container: HTMLElement;
  rangeMode: DiapsonRangeMode;
  formatObservable?: Observable<ChartOptionsModel>;
  removeSelf?: () => void;
  stepSize?: number;
  stepLabel?: string;
}

export interface DiapsonState {
  hidden: boolean;
  isActive: boolean;
  interactionMode: InteractionMode;
  rangeMode: DiapsonRangeMode;
  startTime: Time | null;
  endTime: Time | null;
  startPrice: number | null;
  endPrice: number | null;
}

interface DiapsonGeometry {
  left: number;
  right: number;
  top: number;
  bottom: number;
  width: number;
  height: number;
  startPoint: Point;
  endPoint: Point;
}

export interface DiapsonRenderData extends DiapsonGeometry {
  rangeMode: DiapsonRangeMode;
  showFill: boolean;
  showHandles: boolean;
  labelLines: string[];
}

interface DateMetrics {
  barsCount: number;
  elapsedText: string;
  volumeText: string;
}

interface PriceMetrics {
  delta: number;
  percent: number;
  steps: number;
}

const HANDLE_HIT_TOLERANCE = 8;
const BODY_HIT_TOLERANCE = 6;
const MIN_RECTANGLE_WIDTH = 6;
const MIN_RECTANGLE_HEIGHT = 6;

export class Diapson implements ISeriesDrawing {
  private chart: IChartApi;
  private series: SeriesApi;
  private readonly container: HTMLElement;
  private readonly removeSelf?: () => void;

  private requestUpdate: (() => void) | null = null;
  private isBound = false;
  private readonly subscriptions = new Subscription();

  private hidden = false;
  private isActive = false;
  private interactionMode: InteractionMode = 'idle';
  private rangeMode: DiapsonRangeMode;

  private startTime: Time | null = null;
  private endTime: Time | null = null;
  private startPrice: number | null = null;
  private endPrice: number | null = null;

  private activeDragTarget: DiapsonHandle = null;
  private dragPointerId: number | null = null;
  private dragStartPoint: Point | null = null;
  private dragGeometrySnapshot: DiapsonGeometry | null = null;

  private displayFormat: ChartOptionsModel = {
    dateFormat: Defaults.dateFormat,
    timeFormat: Defaults.timeFormat,
    showTime: Defaults.showTime,
  };

  private readonly stepSize: number;
  private readonly stepLabel: string;

  private readonly paneView: DiapsonPaneView;
  private readonly timeAxisPaneView: CustomTimeAxisPaneView;
  private readonly priceAxisPaneView: CustomPriceAxisPaneView;
  private readonly leftTimeAxisView: CustomTimeAxisView;
  private readonly rightTimeAxisView: CustomTimeAxisView;
  private readonly topPriceAxisView: CustomPriceAxisView;
  private readonly bottomPriceAxisView: CustomPriceAxisView;

  constructor(chart: IChartApi, series: SeriesApi, params: DiapsonParams) {
    const { container, rangeMode, formatObservable, removeSelf, stepSize = 1, stepLabel = '' } = params;

    this.chart = chart;
    this.series = series;
    this.container = container;
    this.rangeMode = rangeMode;
    this.removeSelf = removeSelf;
    this.stepSize = stepSize > 0 ? stepSize : 1;
    this.stepLabel = stepLabel;

    this.paneView = new DiapsonPaneView(this);

    this.timeAxisPaneView = new CustomTimeAxisPaneView({
      getAxisSegments: () => this.getTimeAxisSegments(),
    });

    this.priceAxisPaneView = new CustomPriceAxisPaneView({
      getAxisSegments: () => this.getPriceAxisSegments(),
    });

    this.leftTimeAxisView = new CustomTimeAxisView({
      getAxisLabel: (kind) => this.getTimeAxisLabel(kind),
      labelKind: 'left',
    });

    this.rightTimeAxisView = new CustomTimeAxisView({
      getAxisLabel: (kind) => this.getTimeAxisLabel(kind),
      labelKind: 'right',
    });

    this.topPriceAxisView = new CustomPriceAxisView({
      getAxisLabel: (kind) => this.getPriceAxisLabel(kind),
      labelKind: 'top',
    });

    this.bottomPriceAxisView = new CustomPriceAxisView({
      getAxisLabel: (kind) => this.getPriceAxisLabel(kind),
      labelKind: 'bottom',
    });

    if (formatObservable) {
      this.subscriptions.add(
        formatObservable.subscribe((format) => {
          this.displayFormat = format;
          this.render();
        }),
      );
    }

    this.series.attachPrimitive(this);
  }

  public show(): void {
    this.hidden = false;
    this.render();
  }

  public hide(): void {
    this.hidden = true;
    this.render();
  }

  public destroy(): void {
    this.unbindEvents();
    this.subscriptions.unsubscribe();
    this.series.detachPrimitive(this);
    this.requestUpdate = null;
  }

  public rebind(series: SeriesApi): void {
    if (this.series === series) {
      return;
    }

    this.unbindEvents();
    this.series.detachPrimitive(this);

    this.series = series;
    this.requestUpdate = null;

    this.series.attachPrimitive(this);
    this.render();
  }

  public setRangeMode(nextMode: DiapsonRangeMode): void {
    if (this.rangeMode === nextMode) {
      return;
    }

    this.rangeMode = nextMode;
    this.resetToIdle();
  }

  public getState(): DiapsonState {
    return {
      hidden: this.hidden,
      isActive: this.isActive,
      interactionMode: this.interactionMode,
      rangeMode: this.rangeMode,
      startTime: this.startTime,
      endTime: this.endTime,
      startPrice: this.startPrice,
      endPrice: this.endPrice,
    };
  }

  public setState(state: unknown): void {
    if (!state || typeof state !== 'object') {
      return;
    }

    const nextState = state as Partial<DiapsonState>;

    this.hidden = typeof nextState.hidden === 'boolean' ? nextState.hidden : this.hidden;
    this.isActive = typeof nextState.isActive === 'boolean' ? nextState.isActive : this.isActive;
    this.interactionMode = nextState.interactionMode ?? this.interactionMode;
    this.rangeMode = nextState.rangeMode ?? this.rangeMode;
    this.startTime = 'startTime' in nextState ? (nextState.startTime ?? null) : this.startTime;
    this.endTime = 'endTime' in nextState ? (nextState.endTime ?? null) : this.endTime;
    this.startPrice = 'startPrice' in nextState ? (nextState.startPrice ?? null) : this.startPrice;
    this.endPrice = 'endPrice' in nextState ? (nextState.endPrice ?? null) : this.endPrice;

    this.render();
  }

  public attached(param: SeriesAttachedParameter<Time, keyof SeriesOptionsMap>): void {
    this.requestUpdate = param.requestUpdate;
    this.bindEvents();
  }

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

  public updateAllViews(): void {
    updateViews([
      this.paneView,
      this.timeAxisPaneView,
      this.priceAxisPaneView,
      this.leftTimeAxisView,
      this.rightTimeAxisView,
      this.topPriceAxisView,
      this.bottomPriceAxisView,
    ]);
  }

  public paneViews(): readonly IPrimitivePaneView[] {
    return [this.paneView];
  }

  public timeAxisPaneViews(): readonly IPrimitivePaneView[] {
    return [this.timeAxisPaneView];
  }

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

  public timeAxisViews() {
    return [this.leftTimeAxisView, this.rightTimeAxisView];
  }

  public priceAxisViews() {
    return [this.topPriceAxisView, this.bottomPriceAxisView];
  }

  public autoscaleInfo(_startTimePoint: Logical, _endTimePoint: Logical): AutoscaleInfo | null {
    return null;
  }

  public getRenderData(): DiapsonRenderData | null {
    if (this.hidden) {
      return null;
    }

    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    return {
      ...geometry,
      rangeMode: this.rangeMode,
      showFill: true,
      showHandles: this.isActive,
      labelLines: this.getLabelLines(),
    };
  }

  public getTimeAxisSegments(): AxisSegment[] {
    if (!this.isActive) {
      return [];
    }

    const bounds = this.getTimeBounds();

    if (!bounds) {
      return [];
    }

    const { colors } = getThemeStore();

    return [
      {
        from: bounds.left,
        to: bounds.right,
        color: colors.axisMarkerAreaFill,
      },
    ];
  }

  public getPriceAxisSegments(): AxisSegment[] {
    if (!this.isActive) {
      return [];
    }

    const bounds = this.getPriceBounds();

    if (!bounds) {
      return [];
    }

    const { colors } = getThemeStore();

    return [
      {
        from: bounds.top,
        to: bounds.bottom,
        color: colors.axisMarkerAreaFill,
      },
    ];
  }

  public getTimeAxisLabel(kind: string): AxisLabel | null {
    if (!this.isActive || (kind !== 'left' && kind !== 'right')) {
      return null;
    }

    const labelKind = kind as TimeLabelKind;
    const coordinate = this.getTimeCoordinate(labelKind);
    const text = this.getTimeText(labelKind);

    if (coordinate === null || !text) {
      return null;
    }

    const { colors } = getThemeStore();

    return {
      coordinate,
      text,
      textColor: colors.chartPriceLineText,
      backgroundColor: colors.axisMarkerLabelFill,
    };
  }

  public getPriceAxisLabel(kind: string): AxisLabel | null {
    if (!this.isActive || (kind !== 'top' && kind !== 'bottom')) {
      return null;
    }

    const labelKind = kind as PriceLabelKind;
    const coordinate = this.getPriceCoordinate(labelKind);
    const text = this.getPriceText(labelKind);

    if (coordinate === null || !text) {
      return null;
    }

    const { colors } = getThemeStore();

    return {
      coordinate,
      text,
      textColor: colors.chartPriceLineText,
      backgroundColor: colors.axisMarkerLabelFill,
    };
  }

  public hitTest(x: number, y: number): PrimitiveHoveredItem | null {
    if (this.hidden || this.interactionMode === 'idle' || this.interactionMode === 'drawing') {
      return null;
    }

    const point = { x, y };

    if (!this.isActive) {
      if (!this.containsPoint(point)) {
        return null;
      }

      return {
        cursorStyle: 'move',
        externalId: `diapson-${this.rangeMode}`,
        zOrder: 'top',
      };
    }

    const handleTarget = this.getHandleTarget(point);

    if (handleTarget) {
      return {
        cursorStyle: this.getCursorStyle(handleTarget),
        externalId: `diapson-${this.rangeMode}`,
        zOrder: 'top',
      };
    }

    if (!this.containsPoint(point)) {
      return null;
    }

    return {
      cursorStyle: 'move',
      externalId: `diapson-${this.rangeMode}`,
      zOrder: 'top',
    };
  }

  private bindEvents(): void {
    if (this.isBound) {
      return;
    }

    this.isBound = true;

    this.container.addEventListener('pointerdown', this.handlePointerDown);
    window.addEventListener('pointermove', this.handlePointerMove);
    window.addEventListener('pointerup', this.handlePointerUp);
    window.addEventListener('pointercancel', this.handlePointerUp);
  }

  private unbindEvents(): void {
    if (!this.isBound) {
      return;
    }

    this.isBound = false;

    this.container.removeEventListener('pointerdown', this.handlePointerDown);
    window.removeEventListener('pointermove', this.handlePointerMove);
    window.removeEventListener('pointerup', this.handlePointerUp);
    window.removeEventListener('pointercancel', this.handlePointerUp);
  }

  private handlePointerDown = (event: PointerEvent): void => {
    if (this.hidden || event.button !== 0) {
      return;
    }

    const point = this.getEventPoint(event);

    if (this.interactionMode === 'idle') {
      event.preventDefault();
      event.stopPropagation();

      this.startDrawing(point);
      return;
    }

    if (this.interactionMode === 'drawing') {
      event.preventDefault();
      event.stopPropagation();

      this.updateDrawing(point);
      this.finishDrawing();
      return;
    }

    if (this.interactionMode !== 'ready') {
      return;
    }

    if (!this.isActive) {
      if (!this.containsPoint(point)) {
        return;
      }

      event.preventDefault();
      event.stopPropagation();

      this.isActive = true;
      this.render();
      return;
    }

    const dragTarget = this.getDragTarget(point);

    if (!dragTarget) {
      this.isActive = false;
      this.render();
      return;
    }

    event.preventDefault();
    event.stopPropagation();

    this.startDragging(point, event.pointerId, dragTarget);
  };

  private handlePointerMove = (event: PointerEvent): void => {
    const point = this.getEventPoint(event);

    if (this.interactionMode === 'drawing') {
      this.updateDrawing(point);
      return;
    }

    if (this.interactionMode !== 'dragging' || this.dragPointerId !== event.pointerId) {
      return;
    }

    event.preventDefault();

    if (this.activeDragTarget === 'body') {
      this.moveWhole(point);
      this.render();
      return;
    }

    this.resizeRectangle(point);
    this.render();
  };

  private handlePointerUp = (event: PointerEvent): void => {
    if (this.interactionMode !== 'dragging' || this.dragPointerId !== event.pointerId) {
      return;
    }

    this.finishDragging();
  };

  private startDrawing(point: Point): void {
    const anchor = this.createAnchor(this.clampPointToContainer(point));

    if (!anchor) {
      return;
    }

    this.startTime = anchor.time;
    this.endTime = anchor.time;
    this.startPrice = anchor.price;
    this.endPrice = anchor.price;

    this.isActive = true;
    this.interactionMode = 'drawing';
    this.render();
  }

  private updateDrawing(point: Point): void {
    const anchor = this.createAnchor(this.clampPointToContainer(point));

    if (!anchor) {
      return;
    }

    this.endTime = anchor.time;
    this.endPrice = anchor.price;

    this.render();
  }

  private finishDrawing(): void {
    const geometry = this.getGeometry();

    if (!geometry) {
      this.resetToIdle();
      return;
    }

    if (geometry.width < MIN_RECTANGLE_WIDTH || geometry.height < MIN_RECTANGLE_HEIGHT) {
      if (this.removeSelf) {
        this.removeSelf();
        return;
      }

      this.resetToIdle();
      return;
    }

    this.interactionMode = 'ready';
    this.render();
  }

  private startDragging(point: Point, pointerId: number, dragTarget: Exclude<DiapsonHandle, null>): void {
    this.interactionMode = 'dragging';
    this.activeDragTarget = dragTarget;
    this.dragPointerId = pointerId;
    this.dragStartPoint = point;
    this.dragGeometrySnapshot = this.getGeometry();

    this.render();
  }

  private finishDragging(): void {
    this.interactionMode = 'ready';
    this.clearInteractionState();
    this.render();
  }

  private clearInteractionState(): void {
    this.activeDragTarget = null;
    this.dragPointerId = null;
    this.dragStartPoint = null;
    this.dragGeometrySnapshot = null;
  }

  private resetToIdle(): void {
    this.hidden = false;
    this.isActive = false;
    this.interactionMode = 'idle';
    this.startTime = null;
    this.endTime = null;
    this.startPrice = null;
    this.endPrice = null;
    this.clearInteractionState();
    this.render();
  }

  private getDragTarget(point: Point): Exclude<DiapsonHandle, null> | null {
    const handleTarget = this.getHandleTarget(point);

    if (handleTarget) {
      return handleTarget;
    }

    if (this.containsPoint(point)) {
      return 'body';
    }

    return null;
  }

  private moveWhole(point: Point): void {
    const geometry = this.dragGeometrySnapshot;
    const { dragStartPoint } = this;

    if (!geometry || !dragStartPoint) {
      return;
    }

    const { width, height } = this.getContainerSize();

    const rawOffsetX = point.x - dragStartPoint.x;
    const rawOffsetY = point.y - dragStartPoint.y;

    const offsetX = clamp(rawOffsetX, -geometry.left, width - geometry.right);
    const offsetY = clamp(rawOffsetY, -geometry.top, height - geometry.bottom);

    const nextStartPoint = this.clampPointToContainer({
      x: geometry.startPoint.x + offsetX,
      y: geometry.startPoint.y + offsetY,
    });

    const nextEndPoint = this.clampPointToContainer({
      x: geometry.endPoint.x + offsetX,
      y: geometry.endPoint.y + offsetY,
    });

    this.setAnchorsFromPoints(nextStartPoint, nextEndPoint);
  }

  private resizeRectangle(point: Point): void {
    const geometry = this.dragGeometrySnapshot;

    if (!geometry || !this.activeDragTarget || this.activeDragTarget === 'body') {
      return;
    }

    const nextPoint = this.clampPointToContainer(point);

    if (this.activeDragTarget === 'start') {
      this.setAnchorsFromPoints(nextPoint, geometry.endPoint);
      return;
    }

    this.setAnchorsFromPoints(geometry.startPoint, nextPoint);
  }

  private setAnchorsFromPoints(startPoint: Point, endPoint: Point): void {
    const startAnchor = this.createAnchor(startPoint);
    const endAnchor = this.createAnchor(endPoint);

    if (!startAnchor || !endAnchor) {
      return;
    }

    this.startTime = startAnchor.time;
    this.startPrice = startAnchor.price;
    this.endTime = endAnchor.time;
    this.endPrice = endAnchor.price;
  }

  private createAnchor(point: Point): Anchor | null {
    return getAnchorFromPoint(this.chart, this.series, point);
  }

  private getGeometry(): DiapsonGeometry | null {
    if (this.startTime === null || this.endTime === null || this.startPrice === null || this.endPrice === null) {
      return null;
    }

    const startX = getXCoordinateFromTime(this.chart, this.startTime);
    const endX = getXCoordinateFromTime(this.chart, this.endTime);
    const startY = getYCoordinateFromPrice(this.series, this.startPrice);
    const endY = getYCoordinateFromPrice(this.series, this.endPrice);

    if (startX === null || endX === null || startY === null || endY === null) {
      return null;
    }

    const { width, height } = this.getContainerSize();

    const startPoint = {
      x: clamp(Math.round(Number(startX)), 0, width),
      y: clamp(Math.round(Number(startY)), 0, height),
    };

    const endPoint = {
      x: clamp(Math.round(Number(endX)), 0, width),
      y: clamp(Math.round(Number(endY)), 0, height),
    };

    const left = Math.round(Math.min(startPoint.x, endPoint.x));
    const right = Math.round(Math.max(startPoint.x, endPoint.x));
    const top = Math.round(Math.min(startPoint.y, endPoint.y));
    const bottom = Math.round(Math.max(startPoint.y, endPoint.y));

    return {
      left,
      right,
      top,
      bottom,
      width: right - left,
      height: bottom - top,
      startPoint,
      endPoint,
    };
  }

  private getLabelLines(): string[] {
    if (this.rangeMode === 'date') {
      const metrics = this.getDateMetrics();

      if (!metrics) {
        return [];
      }

      const firstLine = metrics.elapsedText
        ? `${metrics.barsCount} bars, ${metrics.elapsedText}`
        : `${metrics.barsCount} bars`;

      if (!metrics.volumeText) {
        return [firstLine];
      }

      return [firstLine, `Vol ${metrics.volumeText}`];
    }

    const metrics = this.getPriceMetrics();

    if (!metrics) {
      return [];
    }

    const percentText =
      metrics.percent < 0 ? `-${formatPercent(Math.abs(metrics.percent))}` : formatPercent(Math.abs(metrics.percent));

    const absSteps = Math.abs(metrics.steps);
    let stepsText = '';

    if (Number.isInteger(absSteps)) {
      stepsText = absSteps.toString();
    } else if (absSteps >= 1000) {
      stepsText = absSteps.toFixed(0);
    } else if (absSteps >= 100) {
      stepsText = absSteps.toFixed(1);
    } else {
      stepsText = absSteps.toFixed(2);
    }

    if (metrics.steps < 0) {
      stepsText = `-${stepsText}`;
    }

    const stepSuffix = this.stepLabel ? ` ${this.stepLabel}` : '';

    return [`${formatSignedNumber(metrics.delta)} (${percentText}) ${stepsText}${stepSuffix}`];
  }

  private getDateMetrics(): DateMetrics | null {
    const leftTime = this.getLeftTimeValue();
    const rightTime = this.getRightTimeValue();

    if (!leftTime || !rightTime) {
      return null;
    }

    const barsCount = this.getBarsCount();
    const durationSeconds = Math.max(0, Math.floor(Math.abs(Number(rightTime) - Number(leftTime))));
    const days = Math.floor(durationSeconds / 86400);
    const hours = Math.floor((durationSeconds % 86400) / 3600);
    const minutes = Math.floor((durationSeconds % 3600) / 60);
    const seconds = durationSeconds % 60;

    const elapsedParts: string[] = [];

    if (days > 0) {
      elapsedParts.push(`${days}d`);
    }

    if (hours > 0) {
      elapsedParts.push(`${hours}h`);
    }

    if (minutes > 0) {
      elapsedParts.push(`${minutes}m`);
    }

    if (elapsedParts.length === 0) {
      elapsedParts.push(`${seconds}s`);
    }

    const volume = this.getVolumeInRange();

    return {
      barsCount,
      elapsedText: elapsedParts.slice(0, 2).join(' '),
      volumeText: volume > 0 ? formatVolume(volume) : '',
    };
  }

  private getPriceMetrics(): PriceMetrics | null {
    if (this.startPrice === null || this.endPrice === null) {
      return null;
    }

    const delta = this.endPrice - this.startPrice;

    return {
      delta,
      percent: this.startPrice !== 0 ? (delta / Math.abs(this.startPrice)) * 100 : 0,
      steps: delta / this.stepSize,
    };
  }

  private getBarsCount(): number {
    if (this.startTime === null || this.endTime === null) {
      return 0;
    }

    const startIndex = this.findIndexByTime(this.startTime);
    const endIndex = this.findIndexByTime(this.endTime);

    if (startIndex < 0 || endIndex < 0) {
      return 0;
    }

    return Math.abs(endIndex - startIndex);
  }

  private getVolumeInRange(): number {
    if (this.startTime === null || this.endTime === null) {
      return 0;
    }

    const data = this.series.data() ?? [];

    if (!data.length) {
      return 0;
    }

    const startIndex = this.findIndexByTime(this.startTime);
    const endIndex = this.findIndexByTime(this.endTime);

    if (startIndex < 0 || endIndex < 0) {
      return 0;
    }

    const from = Math.min(startIndex, endIndex);
    const to = Math.max(startIndex, endIndex);

    let volume = 0;

    for (let index = from; index <= to; index += 1) {
      const item = data.at(index) as Record<string, unknown> | undefined;

      if (!item) {
        continue;
      }

      if (typeof item.volume === 'number') {
        volume += item.volume;
        continue;
      }

      const customValues = item.customValues as Record<string, unknown> | undefined;

      if (customValues && typeof customValues.volume === 'number') {
        volume += customValues.volume;
      }
    }

    return volume;
  }

  private findIndexByTime(time: Time): number {
    const data = this.series.data() ?? [];

    return data.findIndex((item) => Number(item.time) === Number(time));
  }

  private getTimeBounds(): { left: number; right: number } | null {
    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    return {
      left: geometry.left,
      right: geometry.right,
    };
  }

  private getPriceBounds(): { top: number; bottom: number } | null {
    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    return {
      top: geometry.top,
      bottom: geometry.bottom,
    };
  }

  private getTimeCoordinate(kind: TimeLabelKind): number | null {
    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    return kind === 'left' ? geometry.left : geometry.right;
  }

  private getPriceCoordinate(kind: PriceLabelKind): number | null {
    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    return kind === 'top' ? geometry.top : geometry.bottom;
  }

  private getTimeText(kind: TimeLabelKind): string {
    const time = kind === 'left' ? this.getLeftTimeValue() : this.getRightTimeValue();

    if (!time) {
      return '';
    }

    return formatDate(
      time as UTCTimestamp,
      this.displayFormat.dateFormat,
      this.displayFormat.timeFormat,
      this.displayFormat.showTime,
    );
  }

  private getPriceText(kind: PriceLabelKind): string {
    const price = kind === 'top' ? this.getTopPriceValue() : this.getBottomPriceValue();

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

    return formatPrice(price) ?? '';
  }

  private getLeftTimeValue(): Time | null {
    if (this.startTime === null || this.endTime === null) {
      return null;
    }

    const startX = getXCoordinateFromTime(this.chart, this.startTime);
    const endX = getXCoordinateFromTime(this.chart, this.endTime);

    if (startX === null || endX === null) {
      return this.startTime;
    }

    return Number(startX) <= Number(endX) ? this.startTime : this.endTime;
  }

  private getRightTimeValue(): Time | null {
    if (this.startTime === null || this.endTime === null) {
      return null;
    }

    const startX = getXCoordinateFromTime(this.chart, this.startTime);
    const endX = getXCoordinateFromTime(this.chart, this.endTime);

    if (startX === null || endX === null) {
      return this.endTime;
    }

    return Number(startX) <= Number(endX) ? this.endTime : this.startTime;
  }

  private getTopPriceValue(): number | null {
    if (this.startPrice === null || this.endPrice === null) {
      return null;
    }

    const startY = getYCoordinateFromPrice(this.series, this.startPrice);
    const endY = getYCoordinateFromPrice(this.series, this.endPrice);

    if (startY === null || endY === null) {
      return Math.max(this.startPrice, this.endPrice);
    }

    return Number(startY) <= Number(endY) ? this.startPrice : this.endPrice;
  }

  private getBottomPriceValue(): number | null {
    if (this.startPrice === null || this.endPrice === null) {
      return null;
    }

    const startY = getYCoordinateFromPrice(this.series, this.startPrice);
    const endY = getYCoordinateFromPrice(this.series, this.endPrice);

    if (startY === null || endY === null) {
      return Math.min(this.startPrice, this.endPrice);
    }

    return Number(startY) <= Number(endY) ? this.endPrice : this.startPrice;
  }

  private getHandleTarget(point: Point): Exclude<DiapsonHandle, 'body' | null> | null {
    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    if (isNearPoint(point, geometry.startPoint.x, geometry.startPoint.y, HANDLE_HIT_TOLERANCE)) {
      return 'start';
    }

    if (isNearPoint(point, geometry.endPoint.x, geometry.endPoint.y, HANDLE_HIT_TOLERANCE)) {
      return 'end';
    }

    return null;
  }

  private containsPoint(point: Point): boolean {
    const geometry = this.getGeometry();

    if (!geometry) {
      return false;
    }

    return isPointInBounds(point, geometry, BODY_HIT_TOLERANCE);
  }

  private getCursorStyle(handle: Exclude<DiapsonHandle, null>): PrimitiveHoveredItem['cursorStyle'] {
    if (handle === 'body') {
      return 'move';
    }

    const geometry = this.getGeometry();

    if (!geometry) {
      return 'default';
    }

    const sameDirection =
      (geometry.endPoint.x - geometry.startPoint.x >= 0 && geometry.endPoint.y - geometry.startPoint.y >= 0) ||
      (geometry.endPoint.x - geometry.startPoint.x < 0 && geometry.endPoint.y - geometry.startPoint.y < 0);

    return sameDirection ? 'nwse-resize' : 'nesw-resize';
  }

  private getContainerSize(): { width: number; height: number } {
    return getElementContainerSize(this.container);
  }

  private clampPointToContainer(point: Point): Point {
    return clampPointToContainerInElement(point, this.container);
  }

  private getEventPoint(event: PointerEvent): Point {
    return getPointerPointFromEvent(this.container, event);
  }

  private render(): void {
    this.updateAllViews();
    this.requestUpdate?.();
  }
}



import {
  AutoscaleInfo,
  CrosshairMode,
  IChartApi,
  IPrimitivePaneView,
  Logical,
  PrimitiveHoveredItem,
  SeriesAttachedParameter,
  SeriesOptionsMap,
  Time,
  UTCTimestamp,
} from 'lightweight-charts';
import { Observable, Subscription } from 'rxjs';

import {
  CustomPriceAxisPaneView,
  CustomPriceAxisView,
  CustomTimeAxisPaneView,
  CustomTimeAxisView,
} from '@core/Drawings/axis';
import {
  getAnchorFromPoint,
  getPointerPoint as getPointerPointFromEvent,
  getPriceDelta as getPriceDeltaFromCoordinates,
  getXCoordinateFromTime,
  getYCoordinateFromPrice,
  isNearPoint,
  shiftTimeByPixels,
} from '@core/Drawings/helpers';
import { updateViews } from '@core/Drawings/utils';

import { getThemeStore } from '@src/theme';
import { Defaults } from '@src/types/defaults';
import { formatPrice } from '@src/utils';
import { formatDate } from '@src/utils/formatter';

import { RayPaneView } from './paneView';

import type { ISeriesDrawing } from '@core/Drawings/common';
import type { Anchor, AxisLabel, AxisSegment, Point, SeriesApi } from '@core/Drawings/types';
import type { ChartOptionsModel } from '@src/types';

type RayMode = 'idle' | 'drawing' | 'ready' | 'dragging-start' | 'dragging-direction' | 'dragging-body';
type TimeLabelKind = 'start' | 'direction';
type PriceLabelKind = 'start' | 'direction';

interface RayParams {
  container: HTMLElement;
  formatObservable?: Observable<ChartOptionsModel>;
  removeSelf?: () => void;
}

interface RayState {
  hidden: boolean;
  isActive: boolean;
  mode: RayMode;
  startAnchor: Anchor | null;
  directionAnchor: Anchor | null;
}

interface RayGeometry {
  startPoint: Point;
  directionPoint: Point;
  rayEndPoint: Point;
  left: number;
  right: number;
  top: number;
  bottom: number;
}

export interface RayRenderData extends RayGeometry {
  showHandles: boolean;
}

const POINT_HIT_TOLERANCE = 8;
const LINE_HIT_TOLERANCE = 6;
const MIN_LINE_SIZE = 4;

const { colors } = getThemeStore();

export class Ray implements ISeriesDrawing {
  private chart: IChartApi;
  private series: SeriesApi;
  private container: HTMLElement;
  private removeSelf?: () => void;

  private requestUpdate: (() => void) | null = null;
  private subscriptions = new Subscription();
  private isBound = false;

  private hidden = false;
  private isActive = false;
  private mode: RayMode = 'idle';

  private startAnchor: Anchor | null = null;
  private directionAnchor: Anchor | null = null;

  private dragPointerId: number | null = null;
  private dragStartPoint: Point | null = null;
  private dragStateSnapshot: RayState | null = null;

  private displayFormat: ChartOptionsModel = {
    dateFormat: Defaults.dateFormat,
    timeFormat: Defaults.timeFormat,
    showTime: Defaults.showTime,
  };

  private readonly paneView: RayPaneView;
  private readonly timeAxisPaneView: CustomTimeAxisPaneView;
  private readonly priceAxisPaneView: CustomPriceAxisPaneView;
  private readonly startTimeAxisView: CustomTimeAxisView;
  private readonly directionTimeAxisView: CustomTimeAxisView;
  private readonly startPriceAxisView: CustomPriceAxisView;
  private readonly directionPriceAxisView: CustomPriceAxisView;

  constructor(chart: IChartApi, series: SeriesApi, { container, formatObservable, removeSelf }: RayParams) {
    this.chart = chart;
    this.series = series;
    this.container = container;
    this.removeSelf = removeSelf;

    this.paneView = new RayPaneView(this);

    this.timeAxisPaneView = new CustomTimeAxisPaneView({
      getAxisSegments: () => this.getTimeAxisSegments(),
    });

    this.priceAxisPaneView = new CustomPriceAxisPaneView({
      getAxisSegments: () => this.getPriceAxisSegments(),
    });

    this.startTimeAxisView = new CustomTimeAxisView({
      getAxisLabel: (kind) => this.getTimeAxisLabel(kind),
      labelKind: 'start',
    });

    this.directionTimeAxisView = new CustomTimeAxisView({
      getAxisLabel: (kind) => this.getTimeAxisLabel(kind),
      labelKind: 'direction',
    });

    this.startPriceAxisView = new CustomPriceAxisView({
      getAxisLabel: (kind) => this.getPriceAxisLabel(kind),
      labelKind: 'start',
    });

    this.directionPriceAxisView = new CustomPriceAxisView({
      getAxisLabel: (kind) => this.getPriceAxisLabel(kind),
      labelKind: 'direction',
    });

    if (formatObservable) {
      this.subscriptions.add(
        formatObservable.subscribe((format) => {
          this.displayFormat = format;
          this.render();
        }),
      );
    }

    this.series.attachPrimitive(this);
  }

  public show(): void {
    this.hidden = false;
    this.render();
  }

  public hide(): void {
    this.hidden = true;
    this.showCrosshair();
    this.render();
  }

  public destroy(): void {
    this.showCrosshair();
    this.unbindEvents();
    this.subscriptions.unsubscribe();
    this.series.detachPrimitive(this);
    this.requestUpdate = null;
  }

  public rebind(series: SeriesApi): void {
    if (this.series === series) {
      return;
    }

    this.showCrosshair();
    this.unbindEvents();
    this.series.detachPrimitive(this);

    this.series = series;
    this.requestUpdate = null;

    this.series.attachPrimitive(this);
    this.render();
  }

  public getState(): RayState {
    return {
      hidden: this.hidden,
      isActive: this.isActive,
      mode: this.mode,
      startAnchor: this.startAnchor,
      directionAnchor: this.directionAnchor,
    };
  }

  public setState(state: unknown): void {
    const nextState = state as Partial<RayState>;

    if ('hidden' in nextState && typeof nextState.hidden === 'boolean') {
      this.hidden = nextState.hidden;
    }

    if ('isActive' in nextState && typeof nextState.isActive === 'boolean') {
      this.isActive = nextState.isActive;
    }

    if ('mode' in nextState && nextState.mode) {
      this.mode = nextState.mode;
    }

    if ('startAnchor' in nextState) {
      this.startAnchor = nextState.startAnchor ?? null;
    }

    if ('directionAnchor' in nextState) {
      this.directionAnchor = nextState.directionAnchor ?? null;
    }

    this.render();
  }

  public attached(param: SeriesAttachedParameter<Time, keyof SeriesOptionsMap>): void {
    this.requestUpdate = param.requestUpdate;
    this.bindEvents();
  }

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

  public updateAllViews(): void {
    updateViews([
      this.paneView,
      this.timeAxisPaneView,
      this.priceAxisPaneView,
      this.startTimeAxisView,
      this.directionTimeAxisView,
      this.startPriceAxisView,
      this.directionPriceAxisView,
    ]);
  }

  public paneViews(): readonly IPrimitivePaneView[] {
    return [this.paneView];
  }

  public timeAxisPaneViews(): readonly IPrimitivePaneView[] {
    return [this.timeAxisPaneView];
  }

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

  public timeAxisViews() {
    return [this.startTimeAxisView, this.directionTimeAxisView];
  }

  public priceAxisViews() {
    return [this.startPriceAxisView, this.directionPriceAxisView];
  }

  public autoscaleInfo(_start: Logical, _end: Logical): AutoscaleInfo | null {
    return null;
  }

  public getRenderData(): RayRenderData | null {
    if (this.hidden) {
      return null;
    }

    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    return {
      ...geometry,
      showHandles: this.isActive,
    };
  }

  public hitTest(x: number, y: number): PrimitiveHoveredItem | null {
    if (this.hidden || this.mode === 'idle' || this.mode === 'drawing') {
      return null;
    }

    const point = { x, y };

    if (this.getPointTarget(point)) {
      return {
        cursorStyle: 'move',
        externalId: 'ray',
        zOrder: 'top',
      };
    }

    if (!this.isPointNearRay(point)) {
      return null;
    }

    return {
      cursorStyle: 'grab',
      externalId: 'ray',
      zOrder: 'top',
    };
  }

  public getTimeAxisSegments(): AxisSegment[] {
    if (!this.isActive) {
      return [];
    }

    const geometry = this.getGeometry();

    if (!geometry) {
      return [];
    }

    return [
      {
        from: Math.min(geometry.startPoint.x, geometry.directionPoint.x),
        to: Math.max(geometry.startPoint.x, geometry.directionPoint.x),
        color: colors.axisMarkerAreaFill,
      },
    ];
  }

  public getPriceAxisSegments(): AxisSegment[] {
    if (!this.isActive) {
      return [];
    }

    const geometry = this.getGeometry();

    if (!geometry) {
      return [];
    }

    return [
      {
        from: Math.min(geometry.startPoint.y, geometry.directionPoint.y),
        to: Math.max(geometry.startPoint.y, geometry.directionPoint.y),
        color: colors.axisMarkerAreaFill,
      },
    ];
  }

  public getTimeAxisLabel(kind: string): AxisLabel | null {
    if (!this.isActive || (kind !== 'start' && kind !== 'direction')) {
      return null;
    }

    const coordinate = this.getTimeCoordinate(kind);
    const text = this.getTimeText(kind);

    if (coordinate === null || !text) {
      return null;
    }

    return {
      coordinate,
      text,
      textColor: colors.chartPriceLineText,
      backgroundColor: colors.axisMarkerLabelFill,
    };
  }

  public getPriceAxisLabel(kind: string): AxisLabel | null {
    if (!this.isActive || (kind !== 'start' && kind !== 'direction')) {
      return null;
    }

    const coordinate = this.getPriceCoordinate(kind);
    const text = this.getPriceText(kind);

    if (coordinate === null || !text) {
      return null;
    }

    return {
      coordinate,
      text,
      textColor: colors.chartPriceLineText,
      backgroundColor: colors.axisMarkerLabelFill,
    };
  }

  private bindEvents(): void {
    if (this.isBound) {
      return;
    }

    this.isBound = true;

    this.container.addEventListener('pointerdown', this.handlePointerDown);
    window.addEventListener('pointermove', this.handlePointerMove);
    window.addEventListener('pointerup', this.handlePointerUp);
    window.addEventListener('pointercancel', this.handlePointerUp);
  }

  private unbindEvents(): void {
    if (!this.isBound) {
      return;
    }

    this.isBound = false;

    this.container.removeEventListener('pointerdown', this.handlePointerDown);
    window.removeEventListener('pointermove', this.handlePointerMove);
    window.removeEventListener('pointerup', this.handlePointerUp);
    window.removeEventListener('pointercancel', this.handlePointerUp);
  }

  private handlePointerDown = (event: PointerEvent): void => {
    if (this.hidden || event.button !== 0) {
      return;
    }

    const point = this.getEventPoint(event);

    if (this.mode === 'idle') {
      event.preventDefault();
      event.stopPropagation();

      this.startDrawing(point);
      return;
    }

    if (this.mode === 'drawing') {
      event.preventDefault();
      event.stopPropagation();

      this.updateDrawing(point);
      this.finishDrawing();
      return;
    }

    if (this.mode !== 'ready') {
      return;
    }

    const pointTarget = this.getPointTarget(point);

    if (!this.isActive) {
      if (!pointTarget && !this.isPointNearRay(point)) {
        return;
      }

      event.preventDefault();
      event.stopPropagation();

      this.isActive = true;
      this.render();
      return;
    }

    if (pointTarget === 'start') {
      event.preventDefault();
      event.stopPropagation();

      this.startDragging('dragging-start', point, event.pointerId);
      return;
    }

    if (pointTarget === 'direction') {
      event.preventDefault();
      event.stopPropagation();

      this.startDragging('dragging-direction', point, event.pointerId);
      return;
    }

    if (this.isPointNearRay(point)) {
      event.preventDefault();
      event.stopPropagation();

      this.startDragging('dragging-body', point, event.pointerId);
      return;
    }

    this.isActive = false;
    this.render();
  };

  private handlePointerMove = (event: PointerEvent): void => {
    const point = this.getEventPoint(event);

    if (this.mode === 'drawing') {
      this.updateDrawing(point);
      return;
    }

    if (this.dragPointerId !== event.pointerId) {
      return;
    }

    if (this.mode === 'dragging-start' || this.mode === 'dragging-direction') {
      event.preventDefault();
      event.stopPropagation();

      this.movePoint(point);
      this.render();
      return;
    }

    if (this.mode === 'dragging-body') {
      event.preventDefault();
      event.stopPropagation();

      this.moveBody(point);
      this.render();
    }
  };

  private handlePointerUp = (event: PointerEvent): void => {
    if (this.dragPointerId !== event.pointerId) {
      return;
    }

    if (this.mode === 'dragging-start' || this.mode === 'dragging-direction' || this.mode === 'dragging-body') {
      this.finishDragging();
    }
  };

  private startDrawing(point: Point): void {
    const anchor = this.createAnchor(point);

    if (!anchor) {
      return;
    }

    this.startAnchor = anchor;
    this.directionAnchor = anchor;
    this.isActive = true;
    this.mode = 'drawing';
    this.render();
  }

  private updateDrawing(point: Point): void {
    const anchor = this.createAnchor(point);

    if (!anchor) {
      return;
    }

    this.directionAnchor = anchor;
    this.render();
  }

  private finishDrawing(): void {
    const geometry = this.getGeometry();

    if (!geometry) {
      return;
    }

    const lineSize = Math.hypot(
      geometry.directionPoint.x - geometry.startPoint.x,
      geometry.directionPoint.y - geometry.startPoint.y,
    );

    if (lineSize < MIN_LINE_SIZE) {
      this.removeSelf?.();
      return;
    }

    this.mode = 'ready';
    this.render();
  }

  private startDragging(mode: RayMode, point: Point, pointerId: number): void {
    this.mode = mode;
    this.dragPointerId = pointerId;
    this.dragStartPoint = point;
    this.dragStateSnapshot = this.getState();

    this.hideCrosshair();
    this.render();
  }

  private finishDragging(): void {
    this.mode = 'ready';
    this.dragPointerId = null;
    this.dragStartPoint = null;
    this.dragStateSnapshot = null;

    this.showCrosshair();
    this.render();
  }

  private movePoint(point: Point): void {
    const anchor = this.createAnchor(point);

    if (!anchor) {
      return;
    }

    if (this.mode === 'dragging-start') {
      this.startAnchor = anchor;
    }

    if (this.mode === 'dragging-direction') {
      this.directionAnchor = anchor;
    }
  }

  private moveBody(point: Point): void {
    const snapshot = this.dragStateSnapshot;

    if (!snapshot?.startAnchor || !snapshot.directionAnchor || !this.dragStartPoint) {
      return;
    }

    const offsetX = point.x - this.dragStartPoint.x;
    const priceOffset = getPriceDeltaFromCoordinates(this.series, this.dragStartPoint.y, point.y);

    const nextStartTime = shiftTimeByPixels(this.chart, snapshot.startAnchor.time, offsetX);
    const nextDirectionTime = shiftTimeByPixels(this.chart, snapshot.directionAnchor.time, offsetX);

    if (nextStartTime === null || nextDirectionTime === null) {
      return;
    }

    this.startAnchor = {
      time: nextStartTime,
      price: snapshot.startAnchor.price + priceOffset,
    };

    this.directionAnchor = {
      time: nextDirectionTime,
      price: snapshot.directionAnchor.price + priceOffset,
    };
  }

  private createAnchor(point: Point): Anchor | null {
    return getAnchorFromPoint(this.chart, this.series, point);
  }

  private getGeometry(): RayGeometry | null {
    if (!this.startAnchor || !this.directionAnchor) {
      return null;
    }

    const startX = getXCoordinateFromTime(this.chart, this.startAnchor.time);
    const directionX = getXCoordinateFromTime(this.chart, this.directionAnchor.time);
    const startY = getYCoordinateFromPrice(this.series, this.startAnchor.price);
    const directionY = getYCoordinateFromPrice(this.series, this.directionAnchor.price);

    if (startX === null || directionX === null || startY === null || directionY === null) {
      return null;
    }

    const startPoint = {
      x: Math.round(Number(startX)),
      y: Math.round(Number(startY)),
    };

    const directionPoint = {
      x: Math.round(Number(directionX)),
      y: Math.round(Number(directionY)),
    };

    const rayEndPoint = this.getRayEndPoint(startPoint, directionPoint);

    if (!rayEndPoint) {
      return null;
    }

    return {
      startPoint,
      directionPoint,
      rayEndPoint,
      left: Math.min(startPoint.x, rayEndPoint.x),
      right: Math.max(startPoint.x, rayEndPoint.x),
      top: Math.min(startPoint.y, rayEndPoint.y),
      bottom: Math.max(startPoint.y, rayEndPoint.y),
    };
  }

  private getRayEndPoint(startPoint: Point, directionPoint: Point): Point | null {
    const dx = directionPoint.x - startPoint.x;
    const dy = directionPoint.y - startPoint.y;

    if (dx === 0 && dy === 0) {
      return null;
    }

    const { width, height } = this.container.getBoundingClientRect();
    const candidates: Point[] = [];

    if (dx !== 0) {
      const leftT = (0 - startPoint.x) / dx;
      const rightT = (width - startPoint.x) / dx;

      const leftY = startPoint.y + leftT * dy;
      const rightY = startPoint.y + rightT * dy;

      if (leftT >= 1 && leftY >= 0 && leftY <= height) {
        candidates.push({ x: 0, y: leftY });
      }

      if (rightT >= 1 && rightY >= 0 && rightY <= height) {
        candidates.push({ x: width, y: rightY });
      }
    }

    if (dy !== 0) {
      const topT = (0 - startPoint.y) / dy;
      const bottomT = (height - startPoint.y) / dy;

      const topX = startPoint.x + topT * dx;
      const bottomX = startPoint.x + bottomT * dx;

      if (topT >= 1 && topX >= 0 && topX <= width) {
        candidates.push({ x: topX, y: 0 });
      }

      if (bottomT >= 1 && bottomX >= 0 && bottomX <= width) {
        candidates.push({ x: bottomX, y: height });
      }
    }

    return candidates[0] ?? directionPoint;
  }

  private getPointTarget(point: Point): 'start' | 'direction' | null {
    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    if (isNearPoint(point, geometry.startPoint.x, geometry.startPoint.y, POINT_HIT_TOLERANCE)) {
      return 'start';
    }

    if (isNearPoint(point, geometry.directionPoint.x, geometry.directionPoint.y, POINT_HIT_TOLERANCE)) {
      return 'direction';
    }

    return null;
  }

  private isPointNearRay(point: Point): boolean {
    const geometry = this.getGeometry();

    if (!geometry) {
      return false;
    }

    return this.getDistanceToSegment(point, geometry.startPoint, geometry.rayEndPoint) <= LINE_HIT_TOLERANCE;
  }

  private getDistanceToSegment(point: Point, startPoint: Point, endPoint: Point): number {
    const dx = endPoint.x - startPoint.x;
    const dy = endPoint.y - startPoint.y;

    if (dx === 0 && dy === 0) {
      return Math.hypot(point.x - startPoint.x, point.y - startPoint.y);
    }

    const t = Math.max(
      0,
      Math.min(1, ((point.x - startPoint.x) * dx + (point.y - startPoint.y) * dy) / (dx * dx + dy * dy)),
    );

    const projectionX = startPoint.x + t * dx;
    const projectionY = startPoint.y + t * dy;

    return Math.hypot(point.x - projectionX, point.y - projectionY);
  }

  private getTimeCoordinate(kind: TimeLabelKind): number | null {
    const anchor = kind === 'start' ? this.startAnchor : this.directionAnchor;

    if (!anchor) {
      return null;
    }

    const coordinate = getXCoordinateFromTime(this.chart, anchor.time);

    return coordinate === null ? null : Number(coordinate);
  }

  private getPriceCoordinate(kind: PriceLabelKind): number | null {
    const anchor = kind === 'start' ? this.startAnchor : this.directionAnchor;

    if (!anchor) {
      return null;
    }

    const coordinate = getYCoordinateFromPrice(this.series, anchor.price);

    return coordinate === null ? null : Number(coordinate);
  }

  private getTimeText(kind: TimeLabelKind): string {
    const anchor = kind === 'start' ? this.startAnchor : this.directionAnchor;

    if (!anchor || typeof anchor.time !== 'number') {
      return '';
    }

    return formatDate(
      anchor.time as UTCTimestamp,
      this.displayFormat.dateFormat,
      this.displayFormat.timeFormat,
      this.displayFormat.showTime,
    );
  }

  private getPriceText(kind: PriceLabelKind): string {
    const anchor = kind === 'start' ? this.startAnchor : this.directionAnchor;

    if (!anchor) {
      return '';
    }

    return formatPrice(anchor.price) ?? '';
  }

  private hideCrosshair(): void {
    this.chart.applyOptions({
      crosshair: {
        mode: CrosshairMode.Hidden,
      },
    });
  }

  private showCrosshair(): void {
    this.chart.applyOptions({
      crosshair: {
        mode: CrosshairMode.Normal,
      },
    });
  }

  private getEventPoint(event: PointerEvent): Point {
    return getPointerPointFromEvent(this.container, event);
  }

  private render(): void {
    this.updateAllViews();
    this.requestUpdate?.();
  }
}



import { Observable, Subscription } from 'rxjs';

import {
  CustomPriceAxisPaneView,
  CustomPriceAxisView,
  CustomTimeAxisPaneView,
  CustomTimeAxisView,
} from '@core/Drawings/axis';
import {
  clamp,
  clampPointToContainer as clampPointToContainerInElement,
  getAnchorFromPoint,
  getContainerSize as getElementContainerSize,
  getPointerPoint as getPointerPointFromEvent,
  getPriceDelta as getPriceDeltaFromCoordinates,
  getPriceFromYCoordinate,
  getTimeFromXCoordinate,
  getXCoordinateFromTime,
  getYCoordinateFromPrice,
  isNearPoint,
  isPointInBounds,
  normalizeBounds,
  shiftTimeByPixels,
} from '@core/Drawings/helpers';
import { updateViews } from '@core/Drawings/utils';

import { getThemeStore } from '@src/theme';
import { Defaults } from '@src/types/defaults';
import { formatPrice } from '@src/utils';
import { formatDate } from '@src/utils/formatter';

import { RectanglePaneView } from './paneView';

import type { ISeriesDrawing } from '@core/Drawings/common';
import type { AxisLabel, AxisSegment, Point, SeriesApi } from '@core/Drawings/types';
import type { ChartOptionsModel } from '@src/types';
import type {
  AutoscaleInfo,
  IChartApi,
  IPrimitivePaneView,
  Logical,
  PrimitiveHoveredItem,
  SeriesAttachedParameter,
  SeriesOptionsMap,
  Time,
  UTCTimestamp,
} from 'lightweight-charts';

type RectangleMode = 'idle' | 'drawing' | 'ready' | 'dragging';
type RectangleHandle = 'body' | 'nw' | 'n' | 'ne' | 'e' | 'se' | 's' | 'sw' | 'w' | null;
type RectangleHandleKey = Exclude<RectangleHandle, 'body' | null>;
type TimeLabelKind = 'left' | 'right';
type PriceLabelKind = 'top' | 'bottom';

interface RectangleParams {
  container: HTMLElement;
  formatObservable?: Observable<ChartOptionsModel>;
  removeSelf?: () => void;
}

interface RectangleState {
  hidden: boolean;
  isActive: boolean;
  mode: RectangleMode;
  startTime: Time | null;
  endTime: Time | null;
  startPrice: number | null;
  endPrice: number | null;
}

interface RectangleGeometry {
  left: number;
  right: number;
  top: number;
  bottom: number;
  width: number;
  height: number;
  handles: Record<RectangleHandleKey, Point>;
}

export interface RectangleRenderData extends RectangleGeometry {
  showFill: boolean;
  showHandles: boolean;
}

const HANDLE_HIT_TOLERANCE = 8;
const BODY_HIT_TOLERANCE = 6;
const MIN_RECTANGLE_SIZE = 6;

const { colors } = getThemeStore();

export class Rectangle implements ISeriesDrawing {
  private chart: IChartApi;
  private series: SeriesApi;
  private container: HTMLElement;
  private removeSelf?: () => void;

  private requestUpdate: (() => void) | null = null;
  private isBound = false;
  private subscriptions = new Subscription();

  private hidden = false;
  private isActive = false;
  private mode: RectangleMode = 'idle';

  private startTime: Time | null = null;
  private endTime: Time | null = null;
  private startPrice: number | null = null;
  private endPrice: number | null = null;

  private activeDragTarget: RectangleHandle = null;
  private dragPointerId: number | null = null;
  private dragStartPoint: Point | null = null;
  private dragStateSnapshot: RectangleState | null = null;
  private dragGeometrySnapshot: RectangleGeometry | null = null;

  private displayFormat: ChartOptionsModel = {
    dateFormat: Defaults.dateFormat,
    timeFormat: Defaults.timeFormat,
    showTime: Defaults.showTime,
  };

  private readonly paneView: RectanglePaneView;
  private readonly timeAxisPaneView: CustomTimeAxisPaneView;
  private readonly priceAxisPaneView: CustomPriceAxisPaneView;
  private readonly leftTimeAxisView: CustomTimeAxisView;
  private readonly rightTimeAxisView: CustomTimeAxisView;
  private readonly topPriceAxisView: CustomPriceAxisView;
  private readonly bottomPriceAxisView: CustomPriceAxisView;

  constructor(chart: IChartApi, series: SeriesApi, { container, formatObservable, removeSelf }: RectangleParams) {
    this.chart = chart;
    this.series = series;
    this.container = container;
    this.removeSelf = removeSelf;

    this.paneView = new RectanglePaneView(this);

    this.timeAxisPaneView = new CustomTimeAxisPaneView({
      getAxisSegments: () => this.getTimeAxisSegments(),
    });

    this.priceAxisPaneView = new CustomPriceAxisPaneView({
      getAxisSegments: () => this.getPriceAxisSegments(),
    });

    this.leftTimeAxisView = new CustomTimeAxisView({
      getAxisLabel: (kind) => this.getTimeAxisLabel(kind),
      labelKind: 'left',
    });

    this.rightTimeAxisView = new CustomTimeAxisView({
      getAxisLabel: (kind) => this.getTimeAxisLabel(kind),
      labelKind: 'right',
    });

    this.topPriceAxisView = new CustomPriceAxisView({
      getAxisLabel: (kind) => this.getPriceAxisLabel(kind),
      labelKind: 'top',
    });

    this.bottomPriceAxisView = new CustomPriceAxisView({
      getAxisLabel: (kind) => this.getPriceAxisLabel(kind),
      labelKind: 'bottom',
    });

    if (formatObservable) {
      this.subscriptions.add(
        formatObservable.subscribe((format) => {
          this.displayFormat = format;
          this.render();
        }),
      );
    }

    this.series.attachPrimitive(this);
  }

  public show(): void {
    this.hidden = false;
    this.render();
  }

  public hide(): void {
    this.hidden = true;
    this.render();
  }

  public destroy(): void {
    this.unbindEvents();
    this.subscriptions.unsubscribe();
    this.series.detachPrimitive(this);
    this.requestUpdate = null;
  }

  public rebind(series: SeriesApi): void {
    if (this.series === series) {
      return;
    }

    this.unbindEvents();
    this.series.detachPrimitive(this);

    this.series = series;
    this.requestUpdate = null;

    this.series.attachPrimitive(this);
    this.render();
  }

  public getState(): RectangleState {
    return {
      hidden: this.hidden,
      isActive: this.isActive,
      mode: this.mode,
      startTime: this.startTime,
      endTime: this.endTime,
      startPrice: this.startPrice,
      endPrice: this.endPrice,
    };
  }

  public setState(state: unknown): void {
    const nextState = state as Partial<RectangleState>;

    if ('hidden' in nextState && typeof nextState.hidden === 'boolean') {
      this.hidden = nextState.hidden;
    }

    if ('isActive' in nextState && typeof nextState.isActive === 'boolean') {
      this.isActive = nextState.isActive;
    }

    if ('mode' in nextState && nextState.mode) {
      this.mode = nextState.mode;
    }

    if ('startTime' in nextState) {
      this.startTime = nextState.startTime ?? null;
    }

    if ('endTime' in nextState) {
      this.endTime = nextState.endTime ?? null;
    }

    if ('startPrice' in nextState) {
      this.startPrice = nextState.startPrice ?? null;
    }

    if ('endPrice' in nextState) {
      this.endPrice = nextState.endPrice ?? null;
    }

    this.render();
  }

  public attached(param: SeriesAttachedParameter<Time, keyof SeriesOptionsMap>): void {
    this.requestUpdate = param.requestUpdate;
    this.bindEvents();
  }

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

  public updateAllViews(): void {
    updateViews([
      this.paneView,
      this.timeAxisPaneView,
      this.priceAxisPaneView,
      this.leftTimeAxisView,
      this.rightTimeAxisView,
      this.topPriceAxisView,
      this.bottomPriceAxisView,
    ]);
  }

  public paneViews(): readonly IPrimitivePaneView[] {
    return [this.paneView];
  }

  public timeAxisPaneViews(): readonly IPrimitivePaneView[] {
    return [this.timeAxisPaneView];
  }

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

  public timeAxisViews() {
    return [this.leftTimeAxisView, this.rightTimeAxisView];
  }

  public priceAxisViews() {
    return [this.topPriceAxisView, this.bottomPriceAxisView];
  }

  public autoscaleInfo(_start: Logical, _end: Logical): AutoscaleInfo | null {
    return null;
  }

  public getRenderData(): RectangleRenderData | null {
    if (this.hidden) {
      return null;
    }

    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    return {
      ...geometry,
      showFill: true,
      showHandles: this.isActive,
    };
  }

  public getTimeAxisSegments(): AxisSegment[] {
    if (!this.isActive) {
      return [];
    }

    const bounds = this.getTimeBounds();

    if (!bounds) {
      return [];
    }

    return [
      {
        from: bounds.left,
        to: bounds.right,
        color: colors.axisMarkerAreaFill,
      },
    ];
  }

  public getPriceAxisSegments(): AxisSegment[] {
    if (!this.isActive) {
      return [];
    }

    const bounds = this.getPriceBounds();

    if (!bounds) {
      return [];
    }

    return [
      {
        from: bounds.top,
        to: bounds.bottom,
        color: colors.axisMarkerAreaFill,
      },
    ];
  }

  public getTimeAxisLabel(kind: string): AxisLabel | null {
    if (!this.isActive || (kind !== 'left' && kind !== 'right')) {
      return null;
    }

    const labelKind = kind as TimeLabelKind;
    const coordinate = this.getTimeCoordinate(labelKind);
    const text = this.getTimeText(labelKind);

    if (coordinate === null || !text) {
      return null;
    }

    return {
      coordinate,
      text,
      textColor: colors.chartPriceLineText,
      backgroundColor: colors.axisMarkerLabelFill,
    };
  }

  public getPriceAxisLabel(kind: string): AxisLabel | null {
    if (!this.isActive || (kind !== 'top' && kind !== 'bottom')) {
      return null;
    }

    const labelKind = kind as PriceLabelKind;
    const coordinate = this.getPriceCoordinate(labelKind);
    const text = this.getPriceText(labelKind);

    if (coordinate === null || !text) {
      return null;
    }

    return {
      coordinate,
      text,
      textColor: colors.chartPriceLineText,
      backgroundColor: colors.axisMarkerLabelFill,
    };
  }

  public hitTest(x: number, y: number): PrimitiveHoveredItem | null {
    if (this.hidden || this.mode === 'idle' || this.mode === 'drawing') {
      return null;
    }

    const point = { x, y };

    if (!this.isActive) {
      if (!this.containsPoint(point)) {
        return null;
      }

      return {
        cursorStyle: 'pointer',
        externalId: 'rectangle-position',
        zOrder: 'top',
      };
    }

    const handleTarget = this.getHandleTarget(point);

    if (handleTarget) {
      return {
        cursorStyle: this.getCursorStyle(handleTarget),
        externalId: 'rectangle-position',
        zOrder: 'top',
      };
    }

    if (!this.containsPoint(point)) {
      return null;
    }

    return {
      cursorStyle: 'grab',
      externalId: 'rectangle-position',
      zOrder: 'top',
    };
  }

  private bindEvents(): void {
    if (this.isBound) {
      return;
    }

    this.isBound = true;

    this.container.addEventListener('pointerdown', this.handlePointerDown);
    window.addEventListener('pointermove', this.handlePointerMove);
    window.addEventListener('pointerup', this.handlePointerUp);
    window.addEventListener('pointercancel', this.handlePointerUp);
  }

  private unbindEvents(): void {
    if (!this.isBound) {
      return;
    }

    this.isBound = false;

    this.container.removeEventListener('pointerdown', this.handlePointerDown);
    window.removeEventListener('pointermove', this.handlePointerMove);
    window.removeEventListener('pointerup', this.handlePointerUp);
    window.removeEventListener('pointercancel', this.handlePointerUp);
  }

  private handlePointerDown = (event: PointerEvent): void => {
    if (this.hidden || event.button !== 0) {
      return;
    }

    const point = this.getEventPoint(event);

    if (this.mode === 'idle') {
      event.preventDefault();
      event.stopPropagation();

      this.startDrawing(point);
      return;
    }

    if (this.mode === 'drawing') {
      event.preventDefault();
      event.stopPropagation();

      this.updateDrawing(point);
      this.finishDrawing();
      return;
    }

    if (this.mode !== 'ready') {
      return;
    }

    if (!this.isActive) {
      if (!this.containsPoint(point)) {
        return;
      }

      event.preventDefault();
      event.stopPropagation();

      this.isActive = true;
      this.render();
      return;
    }

    const dragTarget = this.getDragTarget(point);

    if (!dragTarget) {
      this.isActive = false;
      this.render();
      return;
    }

    event.preventDefault();
    event.stopPropagation();

    this.startDragging(point, event.pointerId, dragTarget);
  };

  private handlePointerMove = (event: PointerEvent): void => {
    const point = this.getEventPoint(event);

    if (this.mode === 'drawing') {
      this.updateDrawing(point);
      return;
    }

    if (this.mode !== 'dragging' || this.dragPointerId !== event.pointerId) {
      return;
    }

    event.preventDefault();

    if (this.activeDragTarget === 'body') {
      this.moveWhole(point);
      this.render();
      return;
    }

    this.resizeRectangle(point);
    this.render();
  };

  private handlePointerUp = (event: PointerEvent): void => {
    if (this.mode !== 'dragging' || this.dragPointerId !== event.pointerId) {
      return;
    }

    this.finishDragging();
  };

  private startDrawing(point: Point): void {
    const anchor = this.createAnchor(point);

    if (!anchor) {
      return;
    }

    this.startTime = anchor.time;
    this.endTime = anchor.time;
    this.startPrice = anchor.price;
    this.endPrice = anchor.price;

    this.isActive = true;
    this.mode = 'drawing';
    this.render();
  }

  private updateDrawing(point: Point): void {
    const clampedPoint = this.clampPointToContainer(point);
    const anchor = this.createAnchor(clampedPoint);

    if (!anchor) {
      return;
    }

    this.endTime = anchor.time;
    this.endPrice = anchor.price;

    this.render();
  }

  private finishDrawing(): void {
    const geometry = this.getGeometry();

    if (!geometry || geometry.width < MIN_RECTANGLE_SIZE || geometry.height < MIN_RECTANGLE_SIZE) {
      if (this.removeSelf) {
        this.removeSelf();
        return;
      }

      this.resetToIdle();
      return;
    }

    this.mode = 'ready';
    this.render();
  }

  private startDragging(point: Point, pointerId: number, dragTarget: Exclude<RectangleHandle, null>): void {
    this.mode = 'dragging';
    this.activeDragTarget = dragTarget;
    this.dragPointerId = pointerId;
    this.dragStartPoint = point;
    this.dragStateSnapshot = this.getState();
    this.dragGeometrySnapshot = this.getGeometry();

    this.render();
  }

  private finishDragging(): void {
    this.mode = 'ready';
    this.clearInteractionState();
    this.render();
  }

  private clearInteractionState(): void {
    this.activeDragTarget = null;
    this.dragPointerId = null;
    this.dragStartPoint = null;
    this.dragStateSnapshot = null;
    this.dragGeometrySnapshot = null;
  }

  private resetToIdle(): void {
    this.hidden = false;
    this.isActive = false;
    this.mode = 'idle';
    this.startTime = null;
    this.endTime = null;
    this.startPrice = null;
    this.endPrice = null;
    this.clearInteractionState();
    this.render();
  }

  private getDragTarget(point: Point): Exclude<RectangleHandle, null> | null {
    const handleTarget = this.getHandleTarget(point);

    if (handleTarget) {
      return handleTarget;
    }

    if (this.containsPoint(point)) {
      return 'body';
    }

    return null;
  }

  private moveWhole(point: Point): void {
    const snapshot = this.dragStateSnapshot;
    const geometry = this.dragGeometrySnapshot;

    if (!snapshot || !geometry || !this.dragStartPoint) {
      return;
    }

    if (
      snapshot.startTime === null ||
      snapshot.endTime === null ||
      snapshot.startPrice === null ||
      snapshot.endPrice === null
    ) {
      return;
    }

    const containerSize = this.getContainerSize();

    const rawOffsetX = point.x - this.dragStartPoint.x;
    const rawOffsetY = point.y - this.dragStartPoint.y;

    const minOffsetX = -geometry.left;
    const maxOffsetX = containerSize.width - geometry.right;
    const clampedOffsetX = clamp(rawOffsetX, minOffsetX, maxOffsetX);

    const minOffsetY = -geometry.top;
    const maxOffsetY = containerSize.height - geometry.bottom;
    const clampedOffsetY = clamp(rawOffsetY, minOffsetY, maxOffsetY);

    const nextStartTime = this.shiftTime(snapshot.startTime, clampedOffsetX);
    const nextEndTime = this.shiftTime(snapshot.endTime, clampedOffsetX);

    if (nextStartTime === null || nextEndTime === null) {
      return;
    }

    const priceOffset = this.getPriceDelta(this.dragStartPoint.y, this.dragStartPoint.y + clampedOffsetY);

    this.startTime = nextStartTime;
    this.endTime = nextEndTime;
    this.startPrice = snapshot.startPrice + priceOffset;
    this.endPrice = snapshot.endPrice + priceOffset;
  }

  private resizeRectangle(point: Point): void {
    const geometry = this.dragGeometrySnapshot;

    if (!geometry || !this.activeDragTarget || this.activeDragTarget === 'body') {
      return;
    }

    const clampedPoint = this.clampPointToContainer(point);

    let { left } = geometry;
    let { right } = geometry;
    let { top } = geometry;
    let { bottom } = geometry;

    switch (this.activeDragTarget) {
      case 'nw':
        left = clampedPoint.x;
        top = clampedPoint.y;
        break;
      case 'n':
        top = clampedPoint.y;
        break;
      case 'ne':
        right = clampedPoint.x;
        top = clampedPoint.y;
        break;
      case 'e':
        right = clampedPoint.x;
        break;
      case 'se':
        right = clampedPoint.x;
        bottom = clampedPoint.y;
        break;
      case 's':
        bottom = clampedPoint.y;
        break;
      case 'sw':
        left = clampedPoint.x;
        bottom = clampedPoint.y;
        break;
      case 'w':
        left = clampedPoint.x;
        break;
      default:
        return;
    }

    this.setRectangleBounds(left, right, top, bottom);
  }

  private setRectangleBounds(left: number, right: number, top: number, bottom: number): boolean {
    const bounds = normalizeBounds(left, right, top, bottom, this.container);

    const startTime = getTimeFromXCoordinate(this.chart, bounds.left);
    const endTime = getTimeFromXCoordinate(this.chart, bounds.right);
    const startPrice = getPriceFromYCoordinate(this.series, bounds.top);
    const endPrice = getPriceFromYCoordinate(this.series, bounds.bottom);

    if (startTime === null || endTime === null || startPrice === null || endPrice === null) {
      return false;
    }

    this.startTime = startTime;
    this.endTime = endTime;
    this.startPrice = startPrice;
    this.endPrice = endPrice;

    return true;
  }

  private createAnchor(point: Point): { time: Time; price: number } | null {
    return getAnchorFromPoint(this.chart, this.series, point);
  }

  private getGeometry(): RectangleGeometry | null {
    if (this.startTime === null || this.endTime === null || this.startPrice === null || this.endPrice === null) {
      return null;
    }

    const startX = getXCoordinateFromTime(this.chart, this.startTime);
    const endX = getXCoordinateFromTime(this.chart, this.endTime);
    const startY = getYCoordinateFromPrice(this.series, this.startPrice);
    const endY = getYCoordinateFromPrice(this.series, this.endPrice);

    if (startX === null || endX === null || startY === null || endY === null) {
      return null;
    }

    const left = Math.round(Math.min(Number(startX), Number(endX)));
    const right = Math.round(Math.max(Number(startX), Number(endX)));
    const top = Math.round(Math.min(Number(startY), Number(endY)));
    const bottom = Math.round(Math.max(Number(startY), Number(endY)));

    const centerX = (left + right) / 2;
    const centerY = (top + bottom) / 2;

    return {
      left,
      right,
      top,
      bottom,
      width: right - left,
      height: bottom - top,
      handles: {
        nw: { x: left, y: top },
        n: { x: centerX, y: top },
        ne: { x: right, y: top },
        e: { x: right, y: centerY },
        se: { x: right, y: bottom },
        s: { x: centerX, y: bottom },
        sw: { x: left, y: bottom },
        w: { x: left, y: centerY },
      },
    };
  }

  private getTimeBounds(): { left: number; right: number } | null {
    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    return {
      left: geometry.left,
      right: geometry.right,
    };
  }

  private getPriceBounds(): { top: number; bottom: number } | null {
    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    return {
      top: geometry.top,
      bottom: geometry.bottom,
    };
  }

  private getTimeCoordinate(kind: TimeLabelKind): number | null {
    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    return kind === 'left' ? geometry.left : geometry.right;
  }

  private getPriceCoordinate(kind: PriceLabelKind): number | null {
    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    return kind === 'top' ? geometry.top : geometry.bottom;
  }

  private getTimeText(kind: TimeLabelKind): string {
    const time = this.getTimeValueForLabel(kind);

    if (typeof time !== 'number') {
      return '';
    }

    return formatDate(
      time as UTCTimestamp,
      this.displayFormat.dateFormat,
      this.displayFormat.timeFormat,
      this.displayFormat.showTime,
    );
  }

  private getPriceText(kind: PriceLabelKind): string {
    const price = this.getPriceValueForLabel(kind);

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

    return formatPrice(price) ?? '';
  }

  private getTimeValueForLabel(kind: TimeLabelKind): Time | null {
    if (this.startTime === null || this.endTime === null) {
      return null;
    }

    const startX = getXCoordinateFromTime(this.chart, this.startTime);
    const endX = getXCoordinateFromTime(this.chart, this.endTime);

    if (startX === null || endX === null) {
      return kind === 'left' ? this.startTime : this.endTime;
    }

    const startIsLeft = Number(startX) <= Number(endX);

    if (kind === 'left') {
      return startIsLeft ? this.startTime : this.endTime;
    }

    return startIsLeft ? this.endTime : this.startTime;
  }

  private getPriceValueForLabel(kind: PriceLabelKind): number | null {
    if (this.startPrice === null || this.endPrice === null) {
      return null;
    }

    const startY = getYCoordinateFromPrice(this.series, this.startPrice);
    const endY = getYCoordinateFromPrice(this.series, this.endPrice);

    if (startY === null || endY === null) {
      return kind === 'top' ? Math.max(this.startPrice, this.endPrice) : Math.min(this.startPrice, this.endPrice);
    }

    const startIsTop = Number(startY) <= Number(endY);

    if (kind === 'top') {
      return startIsTop ? this.startPrice : this.endPrice;
    }

    return startIsTop ? this.endPrice : this.startPrice;
  }

  private getHandleTarget(point: Point): RectangleHandleKey | null {
    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    const handleOrder: RectangleHandleKey[] = ['nw', 'n', 'ne', 'e', 'se', 's', 'sw', 'w'];

    for (const handleName of handleOrder) {
      const handle = geometry.handles[handleName];

      if (isNearPoint(point, handle.x, handle.y, HANDLE_HIT_TOLERANCE)) {
        return handleName;
      }
    }

    return null;
  }

  private containsPoint(point: Point): boolean {
    const geometry = this.getGeometry();

    if (!geometry) {
      return false;
    }

    return isPointInBounds(point, geometry, BODY_HIT_TOLERANCE);
  }

  private getCursorStyle(handle: Exclude<RectangleHandle, null>): PrimitiveHoveredItem['cursorStyle'] {
    switch (handle) {
      case 'nw':
      case 'se':
        return 'nwse-resize';
      case 'ne':
      case 'sw':
        return 'nesw-resize';
      case 'n':
      case 's':
        return 'ns-resize';
      case 'e':
      case 'w':
        return 'ew-resize';
      case 'body':
        return 'grab';
      default:
        return 'default';
    }
  }

  private shiftTime(time: Time, offsetX: number): Time | null {
    return shiftTimeByPixels(this.chart, time, offsetX);
  }

  private getPriceDelta(fromY: number, toY: number): number {
    return getPriceDeltaFromCoordinates(this.series, fromY, toY);
  }

  private getContainerSize(): { width: number; height: number } {
    return getElementContainerSize(this.container);
  }

  private clampPointToContainer(point: Point): Point {
    return clampPointToContainerInElement(point, this.container);
  }

  private getEventPoint(event: PointerEvent): Point {
    return getPointerPointFromEvent(this.container, event);
  }

  private render(): void {
    this.updateAllViews();
    this.requestUpdate?.();
  }
}


import { Observable, skip, Subscription } from 'rxjs';

import {
  CustomPriceAxisPaneView,
  CustomPriceAxisView,
  CustomTimeAxisPaneView,
  CustomTimeAxisView,
} from '@core/Drawings/axis';

import { getPriceFromYCoordinate, getXCoordinateFromTime, getYCoordinateFromPrice } from '@core/Drawings/helpers';

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

import { ChartOptionsModel, Direction } from '@src/types';
import { Defaults } from '@src/types/defaults';
import { formatPrice, formatVolume } from '@src/utils';
import { formatDate } from '@src/utils/formatter';

import { RulerPaneView } from './paneView';

import type { ISeriesDrawing } from '@core/Drawings/common';
import type { Anchor, AxisLabel, AxisSegment, Point } from '@core/Drawings/types';
import type {
  AutoscaleInfo,
  Coordinate,
  IChartApi,
  IPrimitivePaneView,
  ISeriesApi,
  ISeriesPrimitiveAxisView,
  Logical,
  MouseEventHandler,
  MouseEventParams,
  SeriesAttachedParameter,
  SeriesOptionsMap,
  Time,
  UTCTimestamp,
} from 'lightweight-charts';

type SeriesApi = ISeriesApi<keyof SeriesOptionsMap, Time>;
type RulerMode = 'idle' | 'placingEnd' | 'ready';

export interface RulerStyle {
  lineWidth?: number;
  infoFont?: string;
  padding?: number;
  infoOffset?: number;
  textAlign?: string;
}

interface RulerState {
  hidden: boolean;
  mode: RulerMode;
  startAnchor: Anchor | null;
  endAnchor: Anchor | null;
}

interface RulerParams {
  style?: RulerStyle;
  formatObservable?: Observable<ChartOptionsModel>;
  resetTriggers?: Observable<unknown>[];
  removeSelf?: () => void;
}

interface RulerRenderData {
  hidden: boolean;
  startPoint: Point | null;
  endPoint: Point | null;
  style: Required<RulerStyle>;
  lineColor: string;
  fillColor: string;
  textColor: string;
  infoLines: string[];
  horizontalArrowSide: Direction.Left | Direction.Right | null;
  verticalArrowSide: Direction.Top | Direction.Bottom | null;
}

const DEFAULT_STYLE: Required<RulerStyle> = {
  lineWidth: 2,
  infoFont: '12px Inter, sans-serif',
  padding: 4,
  infoOffset: 8,
  textAlign: 'center',
};

const { colors } = getThemeStore();

export class Ruler implements ISeriesDrawing {
  private chart: IChartApi;
  private series: SeriesApi;

  private requestUpdate: (() => void) | null = null;
  private removeSelf?: () => void;

  private subscriptions = new Subscription();

  private displayFormat: ChartOptionsModel = {
    dateFormat: Defaults.dateFormat,
    timeFormat: Defaults.timeFormat,
    showTime: Defaults.showTime,
  };

  private hidden = false;
  private mode: RulerMode = 'idle';

  private startAnchor: Anchor | null = null;
  private endAnchor: Anchor | null = null;

  private readonly style: Required<RulerStyle>;
  private readonly clickHandler: MouseEventHandler<Time>;
  private readonly moveHandler: MouseEventHandler<Time>;

  private isBound = false;

  private readonly paneView: RulerPaneView;
  private readonly timeAxisPaneView: CustomTimeAxisPaneView;
  private readonly priceAxisPaneView: CustomPriceAxisPaneView;
  private readonly startTimeAxisView: CustomTimeAxisView;
  private readonly endTimeAxisView: CustomTimeAxisView;
  private readonly startPriceAxisView: CustomPriceAxisView;
  private readonly endPriceAxisView: CustomPriceAxisView;

  constructor(
    chart: IChartApi,
    series: SeriesApi,
    { style = {}, resetTriggers = [], formatObservable, removeSelf }: RulerParams = {},
  ) {
    this.chart = chart;
    this.series = series;
    this.removeSelf = removeSelf;
    this.style = { ...DEFAULT_STYLE, ...style };

    this.clickHandler = (params) => this.handleClick(params);
    this.moveHandler = (params) => this.handleMove(params);

    this.paneView = new RulerPaneView(this);

    this.timeAxisPaneView = new CustomTimeAxisPaneView({
      getAxisSegments: () => this.getTimeAxisSegments(),
    });

    this.priceAxisPaneView = new CustomPriceAxisPaneView({
      getAxisSegments: () => this.getPriceAxisSegments(),
    });

    this.startTimeAxisView = new CustomTimeAxisView({
      getAxisLabel: (labelKind) => this.getTimeAxisLabel(labelKind),
      labelKind: 'start',
    });

    this.endTimeAxisView = new CustomTimeAxisView({
      getAxisLabel: (labelKind) => this.getTimeAxisLabel(labelKind),
      labelKind: 'end',
    });

    this.startPriceAxisView = new CustomPriceAxisView({
      getAxisLabel: (labelKind) => this.getPriceAxisLabel(labelKind),
      labelKind: 'start',
    });

    this.endPriceAxisView = new CustomPriceAxisView({
      getAxisLabel: (labelKind) => this.getPriceAxisLabel(labelKind),
      labelKind: 'end',
    });

    if (formatObservable) {
      this.subscriptions.add(
        formatObservable.subscribe((format) => {
          this.displayFormat = format;
          this.render();
        }),
      );
    }

    resetTriggers.forEach((trigger) => {
      this.subscriptions.add(
        trigger.pipe(skip(1)).subscribe(() => {
          this.removeSelf?.();
        }),
      );
    });

    this.series.attachPrimitive(this);
  }

  public show(): void {
    this.hidden = false;
    this.render();
  }

  public hide(): void {
    this.hidden = true;
    this.render();
  }

  public destroy(): void {
    this.setCrosshairVisible(true);
    this.unbindEvents();
    this.subscriptions.unsubscribe();
    this.series.detachPrimitive(this);
    this.requestUpdate = null;
  }

  public rebind(series: SeriesApi): void {
    if (this.series === series) {
      return;
    }

    this.unbindEvents();
    this.series.detachPrimitive(this);

    this.series = series;
    this.requestUpdate = null;

    this.series.attachPrimitive(this);
    this.render();
  }

  public getState(): RulerState {
    return {
      hidden: this.hidden,
      mode: this.mode,
      startAnchor: this.startAnchor,
      endAnchor: this.endAnchor,
    };
  }

  public setState(state: unknown): void {
    const nextState = state as Partial<RulerState>;

    this.hidden = nextState.hidden ?? this.hidden;
    this.mode = nextState.mode ?? this.mode;
    this.startAnchor = nextState.startAnchor ?? this.startAnchor;
    this.endAnchor = nextState.endAnchor ?? this.endAnchor;

    this.render();
  }

  public attached(param: SeriesAttachedParameter<Time, keyof SeriesOptionsMap>): void {
    this.requestUpdate = param.requestUpdate;
    this.bindEvents();
  }

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

  public updateAllViews(): void {
    this.paneView.update();
    this.timeAxisPaneView.update();
    this.priceAxisPaneView.update();
    this.startTimeAxisView.update();
    this.endTimeAxisView.update();
    this.startPriceAxisView.update();
    this.endPriceAxisView.update();
  }

  public paneViews(): readonly IPrimitivePaneView[] {
    return [this.paneView];
  }

  public timeAxisPaneViews(): readonly IPrimitivePaneView[] {
    return [this.timeAxisPaneView];
  }

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

  public timeAxisViews(): readonly ISeriesPrimitiveAxisView[] {
    return [this.startTimeAxisView, this.endTimeAxisView];
  }

  public priceAxisViews(): readonly ISeriesPrimitiveAxisView[] {
    return [this.startPriceAxisView, this.endPriceAxisView];
  }

  public autoscaleInfo(startTimePoint: Logical, endTimePoint: Logical): AutoscaleInfo | null {
    if (this.hidden || this.mode === 'placingEnd') {
      return null;
    }

    if (!this.startAnchor || !this.endAnchor) {
      return null;
    }

    const startCoordinate = getXCoordinateFromTime(this.chart, this.startAnchor.time);
    const endCoordinate = getXCoordinateFromTime(this.chart, this.endAnchor.time);

    if (startCoordinate === null || endCoordinate === null) {
      return null;
    }

    const startLogical = this.chart.timeScale().coordinateToLogical(startCoordinate as Coordinate);
    const endLogical = this.chart.timeScale().coordinateToLogical(endCoordinate as Coordinate);

    if (startLogical === null || endLogical === null) {
      return null;
    }

    const leftLogical = Math.min(Number(startLogical), Number(endLogical));
    const rightLogical = Math.max(Number(startLogical), Number(endLogical));

    if (endTimePoint < leftLogical || startTimePoint > rightLogical) {
      return null;
    }

    return {
      priceRange: {
        minValue: Math.min(Number(this.startAnchor.price), Number(this.endAnchor.price)),
        maxValue: Math.max(Number(this.startAnchor.price), Number(this.endAnchor.price)),
      },
    };
  }

  public getRenderData(): RulerRenderData {
    const startPoint = this.startAnchor ? this.getPoint(this.startAnchor) : null;
    const endPoint = this.endAnchor ? this.getPoint(this.endAnchor) : null;

    const startPrice = this.startAnchor ? Number(this.startAnchor.price) : 0;
    const endPrice = this.endAnchor ? Number(this.endAnchor.price) : 0;
    const priceDiff = endPrice - startPrice;
    const percentDiff = startPrice !== 0 ? (priceDiff / startPrice) * 100 : null;

    const startIndex = this.startAnchor ? this.findIndexByTime(this.startAnchor.time) : -1;
    const endIndex = this.endAnchor ? this.findIndexByTime(this.endAnchor.time) : -1;

    const barsCount = startIndex >= 0 && endIndex >= 0 ? Math.abs(endIndex - startIndex) : 0;
    const volume = this.getVolumeInRange();
    const isLong = priceDiff >= 0;

    const horizontalArrowSide =
      startPoint && endPoint && startPoint.x !== endPoint.x
        ? endPoint.x > startPoint.x
          ? Direction.Right
          : Direction.Left
        : null;

    const verticalArrowSide =
      startPoint && endPoint && startPoint.y !== endPoint.y
        ? endPoint.y > startPoint.y
          ? Direction.Bottom
          : Direction.Top
        : null;

    return {
      hidden: this.hidden,
      startPoint,
      endPoint,
      style: this.style,
      lineColor: isLong ? colors.chartLineColor : colors.chartLineColorAlternative,
      fillColor: isLong ? colors.rulerPositiveFill : colors.rulerNegativeFill,
      textColor: colors.chartPriceLineText,
      infoLines: [
        `${formatPrice(Math.abs(priceDiff))} (${percentDiff === null ? '-' : `${formatPrice(Math.abs(percentDiff))}%`})`,
        `${barsCount} bars,`,
        `Vol ${formatVolume(volume)}`,
      ],
      horizontalArrowSide,
      verticalArrowSide,
    };
  }

  public getTimeCoordinate(kind: 'start' | 'end'): Coordinate | null {
    const anchor = kind === 'start' ? this.startAnchor : this.endAnchor;

    if (!anchor) {
      return null;
    }

    return getXCoordinateFromTime(this.chart, anchor.time);
  }

  public getPriceCoordinate(kind: 'start' | 'end'): Coordinate | null {
    const anchor = kind === 'start' ? this.startAnchor : this.endAnchor;

    if (!anchor) {
      return null;
    }

    return getYCoordinateFromPrice(this.series, anchor.price);
  }

  public getTimeBounds(): { left: number; right: number } | null {
    const startX = this.getTimeCoordinate('start');
    const endX = this.getTimeCoordinate('end');

    if (startX === null || endX === null) {
      return null;
    }

    return {
      left: Math.min(startX, endX),
      right: Math.max(startX, endX),
    };
  }

  public getPriceBounds(): { top: number; bottom: number } | null {
    const startY = this.getPriceCoordinate('start');
    const endY = this.getPriceCoordinate('end');

    if (startY === null || endY === null) {
      return null;
    }

    return {
      top: Math.min(startY, endY),
      bottom: Math.max(startY, endY),
    };
  }

  public getTimeText(kind: 'start' | 'end'): string {
    const anchor = kind === 'start' ? this.startAnchor : this.endAnchor;

    if (!anchor || typeof anchor.time !== 'number') {
      return '';
    }

    return formatDate(
      anchor.time as UTCTimestamp,
      this.displayFormat.dateFormat,
      this.displayFormat.timeFormat,
      this.displayFormat.showTime,
    );
  }

  public getPriceText(kind: 'start' | 'end'): string {
    const anchor = kind === 'start' ? this.startAnchor : this.endAnchor;

    if (!anchor) {
      return '';
    }

    return formatPrice(Number(anchor.price)) ?? '';
  }

  public getTimeAxisSegments(): AxisSegment[] {
    const bounds = this.getTimeBounds();

    if (!bounds) {
      return [];
    }

    return [
      {
        from: bounds.left,
        to: bounds.right,
        color: colors.axisMarkerAreaFill,
      },
    ];
  }

  public getPriceAxisSegments(): AxisSegment[] {
    const bounds = this.getPriceBounds();

    if (!bounds) {
      return [];
    }

    return [
      {
        from: bounds.top,
        to: bounds.bottom,
        color: colors.axisMarkerAreaFill,
      },
    ];
  }

  public getTimeAxisLabel(kind: string): AxisLabel | null {
    if (kind !== 'start' && kind !== 'end') {
      return null;
    }

    const coordinate = this.getTimeCoordinate(kind);
    const text = this.getTimeText(kind);

    if (coordinate === null || !text) {
      return null;
    }

    return {
      coordinate,
      text,
      textColor: colors.chartPriceLineText,
      backgroundColor: colors.axisMarkerLabelFill,
    };
  }

  public getPriceAxisLabel(kind: string): AxisLabel | null {
    if (kind !== 'start' && kind !== 'end') {
      return null;
    }

    const coordinate = this.getPriceCoordinate(kind);
    const text = this.getPriceText(kind);

    if (coordinate === null || !text) {
      return null;
    }

    return {
      coordinate,
      text,
      textColor: colors.chartPriceLineText,
      backgroundColor: colors.axisMarkerLabelFill,
    };
  }

  private findIndexByTime(time: Time): number {
    const data = this.series.data() ?? [];

    return data.findIndex((item) => {
      if (typeof item.time === 'number' && typeof time === 'number') {
        return item.time === time;
      }

      return false;
    });
  }

  private setCrosshairVisible(visible: boolean): void {
    this.chart.applyOptions({
      crosshair: {
        vertLine: {
          visible,
          labelVisible: visible,
        },
        horzLine: {
          visible,
          labelVisible: visible,
        },
      },
    });
  }

  private bindEvents(): void {
    if (this.isBound) {
      return;
    }

    this.isBound = true;
    this.chart.subscribeClick(this.clickHandler);
    this.chart.subscribeCrosshairMove(this.moveHandler);
  }

  private unbindEvents(): void {
    if (!this.isBound) {
      return;
    }

    this.isBound = false;
    this.chart.unsubscribeClick(this.clickHandler);
    this.chart.unsubscribeCrosshairMove(this.moveHandler);
  }

  private render(): void {
    this.updateAllViews();
    this.requestUpdate?.();
  }

  private handleClick(params: MouseEventParams<Time>): void {
    if (this.hidden || !params.point) {
      return;
    }

    if (this.mode === 'ready') {
      this.removeSelf?.();
      return;
    }

    const anchor = this.createAnchor(params);

    if (!anchor) {
      return;
    }

    if (this.mode === 'idle') {
      this.startAnchor = anchor;
      this.endAnchor = anchor;
      this.mode = 'placingEnd';
      this.setCrosshairVisible(false);
      this.render();
      return;
    }

    if (this.mode === 'placingEnd') {
      this.endAnchor = anchor;
      this.mode = 'ready';
      this.setCrosshairVisible(true);
      this.render();
    }
  }

  private handleMove(params: MouseEventParams<Time>): void {
    if (this.hidden || !params.point) {
      return;
    }

    if (this.mode !== 'placingEnd') {
      return;
    }

    const anchor = this.createAnchor(params);

    if (!anchor) {
      return;
    }

    this.endAnchor = anchor;
    this.render();
  }

  private createAnchor({ time, point }: MouseEventParams<Time>): Anchor | null {
    if (!point || time === undefined) {
      return null;
    }

    const price = getPriceFromYCoordinate(this.series, point.y);

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

    return {
      price,
      time,
    };
  }

  private getPoint(anchor: Anchor): Point | null {
    const x = getXCoordinateFromTime(this.chart, anchor.time);
    const y = getYCoordinateFromPrice(this.series, anchor.price);

    if (x === null || y === null) {
      return null;
    }

    return {
      x,
      y,
    };
  }

  private getVolumeInRange(): number {
    if (!this.startAnchor || !this.endAnchor) {
      return 0;
    }

    const data = this.series.data() ?? [];

    if (!data.length) {
      return 0;
    }

    const startIndex = this.findIndexByTime(this.startAnchor.time);
    const endIndex = this.findIndexByTime(this.endAnchor.time);

    if (startIndex < 0 || endIndex < 0) {
      return 0;
    }

    const from = Math.min(startIndex, endIndex);
    const to = Math.max(startIndex, endIndex);

    let volume = 0;

    for (let index = from; index <= to; index += 1) {
      const item = data.at(index) as Record<string, unknown> | undefined;

      if (!item) {
        continue;
      }

      if (typeof item.volume === 'number') {
        volume += item.volume;
        continue;
      }

      const customValues = item.customValues as Record<string, unknown> | undefined;

      if (customValues && typeof customValues.volume === 'number') {
        volume += customValues.volume;
      }
    }

    return volume;
  }
}



import { Observable, skip, Subscription } from 'rxjs';

import {
  CustomPriceAxisPaneView,
  CustomPriceAxisView,
  CustomTimeAxisPaneView,
  CustomTimeAxisView,
} from '@core/Drawings/axis';
import {
  getPointerPoint as getPointerPointFromEvent,
  getPriceDelta as getPriceDeltaFromCoordinates,
  getPriceFromYCoordinate,
  getPriceRangeInContainer,
  getTimeFromXCoordinate,
  getXCoordinateFromTime,
  getYCoordinateFromPrice,
  isNearPoint,
  isPointInBounds,
  shiftTimeByPixels,
} from '@core/Drawings/helpers';
import { updateViews } from '@core/Drawings/utils';

import { getThemeStore } from '@src/theme';
import { Defaults } from '@src/types/defaults';
import { formatPercent, formatPrice, formatSignedNumber } from '@src/utils';
import { formatDate } from '@src/utils/formatter';

import { SliderPaneView } from './paneView';

import type { ISeriesDrawing } from '@core/Drawings/common';
import type { AxisLabel, AxisSegment, Bounds, Point, SeriesApi } from '@core/Drawings/types';
import type { ChartOptionsModel } from '@src/types';
import type {
  AutoscaleInfo,
  IChartApi,
  IPrimitivePaneView,
  Logical,
  MouseEventHandler,
  MouseEventParams,
  PrimitiveHoveredItem,
  SeriesAttachedParameter,
  SeriesOptionsMap,
  Time,
  UTCTimestamp,
} from 'lightweight-charts';

type SliderSide = 'long' | 'short';
type SliderMode = 'idle' | 'ready' | 'dragging';
type DragTarget = 'body' | 'entry' | 'target' | 'stop' | 'end' | null;
type TimeLabelKind = 'start' | 'end';
type PriceLabelKind = 'target' | 'entry' | 'stop';

interface SliderPositionParams {
  side: SliderSide;
  container: HTMLElement;
  formatObservable?: Observable<ChartOptionsModel>;
  resetTriggers?: Observable<unknown>[];
  removeSelf?: () => void;
}

interface SliderPositionState {
  hidden: boolean;
  active: boolean;
  mode: SliderMode;
  startTime: Time | null;
  endTime: Time | null;
  entryPrice: number | null;
  stopPrice: number | null;
  targetPrice: number | null;
  riskRewardRatio: number;
  amount: number;
  tickSize: number;
}

interface SliderGeometry {
  startX: number;
  endX: number;
  leftX: number;
  rightX: number;
  entryY: number;
  stopY: number;
  targetY: number;
  entryPrice: number;
  stopPrice: number;
  targetPrice: number;
  profitTop: number;
  profitBottom: number;
  lossTop: number;
  lossBottom: number;
}

export interface SliderRenderData extends SliderGeometry {
  targetText: string;
  centerText: string;
  stopText: string;
  centerBoxColor: string;
  showFill: boolean;
  showHandles: boolean;
  showLabels: boolean;
}

const HIT_TOLERANCE = 8;
const INITIAL_WIDTH_PX = 160;
const MIN_DISTANCE = 0.00000001;

const { colors } = getThemeStore();

export class SliderPosition implements ISeriesDrawing {
  private chart: IChartApi;
  private series: SeriesApi;
  private container: HTMLElement;
  private removeSelf?: () => void;

  private requestUpdate: (() => void) | null = null;
  private subscriptions = new Subscription();

  private displayFormat: ChartOptionsModel = {
    dateFormat: Defaults.dateFormat,
    timeFormat: Defaults.timeFormat,
    showTime: Defaults.showTime,
  };

  private hidden = false;
  private active = true;
  private mode: SliderMode = 'idle';
  private side: SliderSide;

  private startTime: Time | null = null;
  private endTime: Time | null = null;
  private entryPrice: number | null = null;
  private stopPrice: number | null = null;
  private targetPrice: number | null = null;

  private activeDragTarget: DragTarget = null;
  private dragPointerId: number | null = null;
  private dragStartPoint: Point | null = null;
  private dragStateSnapshot: SliderPositionState | null = null;
  private didDrag = false;

  private defaultRiskRewardRatio = 1;
  private amount = 1000;
  private tickSize = 1;

  private ignoreNextChartClick = false;
  private isBound = false;

  private readonly clickHandler: MouseEventHandler<Time>;
  private readonly paneView: SliderPaneView;
  private readonly timeAxisPaneView: CustomTimeAxisPaneView;
  private readonly priceAxisPaneView: CustomPriceAxisPaneView;
  private readonly startTimeAxisView: CustomTimeAxisView;
  private readonly endTimeAxisView: CustomTimeAxisView;
  private readonly targetPriceAxisView: CustomPriceAxisView;
  private readonly entryPriceAxisView: CustomPriceAxisView;
  private readonly stopPriceAxisView: CustomPriceAxisView;

  constructor(
    chart: IChartApi,
    series: SeriesApi,
    { side, container, formatObservable, resetTriggers = [], removeSelf }: SliderPositionParams,
  ) {
    this.chart = chart;
    this.series = series;
    this.side = side;
    this.container = container;
    this.removeSelf = removeSelf;

    this.clickHandler = (params) => this.handleChartClick(params);

    this.paneView = new SliderPaneView(this);

    this.timeAxisPaneView = new CustomTimeAxisPaneView({
      getAxisSegments: () => this.getTimeAxisSegments(),
    });

    this.priceAxisPaneView = new CustomPriceAxisPaneView({
      getAxisSegments: () => this.getPriceAxisSegments(),
    });

    this.startTimeAxisView = new CustomTimeAxisView({
      getAxisLabel: (kind) => this.getTimeAxisLabel(kind),
      labelKind: 'start',
    });

    this.endTimeAxisView = new CustomTimeAxisView({
      getAxisLabel: (kind) => this.getTimeAxisLabel(kind),
      labelKind: 'end',
    });

    this.targetPriceAxisView = new CustomPriceAxisView({
      getAxisLabel: (kind) => this.getPriceAxisLabel(kind),
      labelKind: 'target',
    });

    this.entryPriceAxisView = new CustomPriceAxisView({
      getAxisLabel: (kind) => this.getPriceAxisLabel(kind),
      labelKind: 'entry',
    });

    this.stopPriceAxisView = new CustomPriceAxisView({
      getAxisLabel: (kind) => this.getPriceAxisLabel(kind),
      labelKind: 'stop',
    });

    if (formatObservable) {
      this.subscriptions.add(
        formatObservable.subscribe((format) => {
          this.displayFormat = format;
          this.render();
        }),
      );
    }

    resetTriggers.forEach((trigger) => {
      this.subscriptions.add(
        trigger.pipe(skip(1)).subscribe(() => {
          this.removeSelf?.();
        }),
      );
    });

    this.series.attachPrimitive(this);
  }

  public show(): void {
    this.hidden = false;
    this.render();
  }

  public hide(): void {
    this.hidden = true;
    this.render();
  }

  public destroy(): void {
    this.unbindEvents();
    this.subscriptions.unsubscribe();
    this.series.detachPrimitive(this);
    this.requestUpdate = null;
    this.setCrosshairVisible(true);
  }

  public rebind(series: SeriesApi): void {
    if (this.series === series) {
      return;
    }

    this.unbindEvents();
    this.series.detachPrimitive(this);
    this.series = series;
    this.requestUpdate = null;
    this.series.attachPrimitive(this);
    this.render();
  }

  public getState(): SliderPositionState {
    return {
      hidden: this.hidden,
      active: this.active,
      mode: this.mode,
      startTime: this.startTime,
      endTime: this.endTime,
      entryPrice: this.entryPrice,
      stopPrice: this.stopPrice,
      targetPrice: this.targetPrice,
      riskRewardRatio: this.getCurrentRiskRewardRatio(),
      amount: this.amount,
      tickSize: this.tickSize,
    };
  }

  public setState(state: unknown): void {
    const next = state as Partial<SliderPositionState>;

    this.hidden = next.hidden ?? this.hidden;
    this.active = next.active ?? this.active;
    this.mode = next.mode ?? this.mode;
    this.startTime = next.startTime ?? this.startTime;
    this.endTime = next.endTime ?? this.endTime;
    this.entryPrice = next.entryPrice ?? this.entryPrice;
    this.stopPrice = next.stopPrice ?? this.stopPrice;
    this.amount = next.amount ?? this.amount;

    if (typeof next.tickSize === 'number' && next.tickSize > 0) {
      this.tickSize = next.tickSize;
    }

    if (next.targetPrice !== undefined) {
      this.targetPrice = next.targetPrice;
    } else if (
      this.entryPrice !== null &&
      this.stopPrice !== null &&
      typeof next.riskRewardRatio === 'number' &&
      next.riskRewardRatio > 0
    ) {
      const risk = Math.abs(this.entryPrice - this.stopPrice);

      this.targetPrice =
        this.side === 'long'
          ? this.entryPrice + risk * next.riskRewardRatio
          : this.entryPrice - risk * next.riskRewardRatio;
    }

    this.render();
  }

  public attached(param: SeriesAttachedParameter<Time, keyof SeriesOptionsMap>): void {
    this.requestUpdate = param.requestUpdate;
    this.bindEvents();
  }

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

  public updateAllViews(): void {
    updateViews([
      this.paneView,
      this.timeAxisPaneView,
      this.priceAxisPaneView,
      this.startTimeAxisView,
      this.endTimeAxisView,
      this.targetPriceAxisView,
      this.entryPriceAxisView,
      this.stopPriceAxisView,
    ]);
  }

  public paneViews(): readonly IPrimitivePaneView[] {
    return [this.paneView];
  }

  public timeAxisPaneViews(): readonly IPrimitivePaneView[] {
    return [this.timeAxisPaneView];
  }

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

  public timeAxisViews() {
    return [this.startTimeAxisView, this.endTimeAxisView];
  }

  public priceAxisViews() {
    return [this.targetPriceAxisView, this.entryPriceAxisView, this.stopPriceAxisView];
  }

  public autoscaleInfo(_start: Logical, _end: Logical): AutoscaleInfo | null {
    return null;
  }

  public getRenderData(): SliderRenderData | null {
    if (this.hidden) {
      return null;
    }

    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    const reward = Math.abs(geometry.targetPrice - geometry.entryPrice);
    const qty = reward > 0 ? this.amount / reward : 0;

    const selectedPrice = this.getPriceAtTime(this.endTime);
    const pnl =
      selectedPrice === null
        ? 0
        : this.side === 'long'
          ? (selectedPrice - geometry.entryPrice) * qty
          : (geometry.entryPrice - selectedPrice) * qty;

    return {
      ...geometry,
      targetText: this.getTargetText(geometry),
      centerText: this.getCenterText(qty, pnl),
      stopText: this.getStopText(geometry),
      centerBoxColor: pnl >= 0 ? colors.chartCandleUp : colors.chartCandleDown,
      showFill: true,
      showHandles: this.active,
      showLabels: this.active,
    };
  }

  public getTimeAxisSegments(): AxisSegment[] {
    if (!this.active) {
      return [];
    }

    const bounds = this.getTimeBounds();

    if (!bounds) {
      return [];
    }

    return [
      {
        from: bounds.left,
        to: bounds.right,
        color: colors.axisMarkerAreaFill,
      },
    ];
  }

  public getPriceAxisSegments(): AxisSegment[] {
    if (!this.active) {
      return [];
    }

    const geometry = this.getGeometry();

    if (!geometry) {
      return [];
    }

    return [
      {
        from: geometry.profitTop,
        to: geometry.profitBottom,
        color: colors.axisMarkerAreaFill,
      },
      {
        from: geometry.lossTop,
        to: geometry.lossBottom,
        color: colors.axisMarkerAreaFill,
      },
    ];
  }

  public getTimeAxisLabel(kind: string): AxisLabel | null {
    if (!this.active || (kind !== 'start' && kind !== 'end')) {
      return null;
    }

    const labelKind = kind as TimeLabelKind;
    const coordinate = this.getTimeCoordinate(labelKind);
    const text = this.getTimeText(labelKind);

    if (coordinate === null || !text) {
      return null;
    }

    return {
      coordinate,
      text,
      textColor: colors.chartPriceLineText,
      backgroundColor: colors.axisMarkerLabelFill,
    };
  }

  public getPriceAxisLabel(kind: string): AxisLabel | null {
    if (kind !== 'target' && kind !== 'entry' && kind !== 'stop') {
      return null;
    }

    const labelKind = kind as PriceLabelKind;
    const coordinate = this.getPriceCoordinate(labelKind);
    const text = this.getPriceText(labelKind);

    if (coordinate === null || !text) {
      return null;
    }

    let backgroundColor = colors.axisMarkerLabelDefaultFill;

    if (labelKind === 'target') {
      backgroundColor = colors.axisMarkerLabelPositiveFill;
    }

    if (labelKind === 'stop') {
      backgroundColor = colors.axisMarkerLabelNegativeFill;
    }

    return {
      coordinate,
      text,
      textColor: colors.chartPriceLineText,
      backgroundColor,
    };
  }

  public getTimeBounds(): { left: number; right: number } | null {
    const start = this.getTimeCoordinate('start');
    const end = this.getTimeCoordinate('end');

    if (start === null || end === null) {
      return null;
    }

    return {
      left: Math.min(start, end),
      right: Math.max(start, end),
    };
  }

  public getTimeCoordinate(kind: TimeLabelKind): number | null {
    const time = kind === 'start' ? this.startTime : this.endTime;

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

    const coordinate = getXCoordinateFromTime(this.chart, time);
    return coordinate === null ? null : Number(coordinate);
  }

  public getTimeText(kind: TimeLabelKind): string {
    const time = kind === 'start' ? this.startTime : this.endTime;

    if (typeof time !== 'number') {
      return '';
    }

    return formatDate(
      time as UTCTimestamp,
      this.displayFormat.dateFormat,
      this.displayFormat.timeFormat,
      this.displayFormat.showTime,
    );
  }

  public getPriceCoordinate(kind: PriceLabelKind): number | null {
    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    switch (kind) {
      case 'target':
        return geometry.targetY;
      case 'entry':
        return geometry.entryY;
      case 'stop':
        return geometry.stopY;
      default:
        return null;
    }
  }

  public getPriceText(kind: PriceLabelKind): string {
    const geometry = this.getGeometry();

    if (!geometry) {
      return '';
    }

    switch (kind) {
      case 'target':
        return formatPrice(geometry.targetPrice) ?? '';
      case 'entry':
        return formatPrice(geometry.entryPrice) ?? '';
      case 'stop':
        return formatPrice(geometry.stopPrice) ?? '';
      default:
        return '';
    }
  }

  public hitTest(x: number, y: number): PrimitiveHoveredItem | null {
    const point = { x, y };

    if (!this.active) {
      if (!this.containsPoint(point)) {
        return null;
      }

      return {
        cursorStyle: 'pointer',
        externalId: 'slider-position',
        zOrder: 'top',
      };
    }

    const dragTarget = this.getHandleTarget(point);

    if (!dragTarget) {
      return null;
    }

    let cursorStyle: PrimitiveHoveredItem['cursorStyle'] = 'grab';

    if (dragTarget === 'target' || dragTarget === 'stop') {
      cursorStyle = 'ns-resize';
    }

    if (dragTarget === 'end') {
      cursorStyle = 'ew-resize';
    }

    return {
      cursorStyle,
      externalId: 'slider-position',
      zOrder: 'top',
    };
  }

  private bindEvents(): void {
    if (this.isBound) {
      return;
    }

    this.isBound = true;

    this.chart.subscribeClick(this.clickHandler);

    this.container.addEventListener('pointerdown', this.handlePointerDown);
    window.addEventListener('pointermove', this.handlePointerMove);
    window.addEventListener('pointerup', this.handlePointerUp);
    window.addEventListener('pointercancel', this.handlePointerUp);
  }

  private unbindEvents(): void {
    if (!this.isBound) {
      return;
    }

    this.isBound = false;

    this.chart.unsubscribeClick(this.clickHandler);

    this.container.removeEventListener('pointerdown', this.handlePointerDown);
    window.removeEventListener('pointermove', this.handlePointerMove);
    window.removeEventListener('pointerup', this.handlePointerUp);
    window.removeEventListener('pointercancel', this.handlePointerUp);
  }

  private setCrosshairVisible(visible: boolean): void {
    this.chart.applyOptions({
      crosshair: {
        vertLine: {
          visible,
          labelVisible: visible,
        },
        horzLine: {
          visible,
          labelVisible: visible,
        },
      },
    });
  }

  private handleChartClick(params: MouseEventParams<Time>): void {
    if (this.ignoreNextChartClick) {
      this.ignoreNextChartClick = false;
      return;
    }

    if (this.hidden || !params.point) {
      return;
    }

    if (this.mode === 'idle') {
      const anchor = this.createAnchor(params);

      if (!anchor) {
        return;
      }

      const distance = this.getInitialZoneDistance(anchor.price);
      const stopDirection = this.side === 'long' ? -1 : 1;
      const targetDirection = -stopDirection;

      this.startTime = anchor.time;
      this.endTime = this.shiftTime(anchor.time, INITIAL_WIDTH_PX) ?? anchor.time;
      this.entryPrice = anchor.price;
      this.stopPrice = this.normalizeStop(anchor.price, anchor.price + distance * stopDirection, distance);
      this.targetPrice = this.normalizeTarget(
        anchor.price,
        anchor.price + distance * targetDirection * this.defaultRiskRewardRatio,
        distance,
      );

      this.active = true;
      this.mode = 'ready';
      this.render();
      return;
    }

    this.active = this.containsPoint({ x: params.point.x, y: params.point.y });
    this.render();
  }

  private handlePointerDown = (event: PointerEvent): void => {
    if (this.hidden || this.mode !== 'ready' || !this.active) {
      return;
    }

    const point = this.getLocalPoint(event);
    const dragTarget = this.getHandleTarget(point);

    if (!dragTarget) {
      return;
    }

    event.preventDefault();
    event.stopPropagation();

    this.activeDragTarget = dragTarget;
    this.dragPointerId = event.pointerId;
    this.dragStartPoint = point;
    this.dragStateSnapshot = this.getState();
    this.didDrag = false;
    this.mode = 'dragging';
  };

  private handlePointerMove = (event: PointerEvent): void => {
    if (this.mode !== 'dragging' || this.dragPointerId !== event.pointerId || !this.dragStateSnapshot) {
      return;
    }

    event.preventDefault();

    this.didDrag = true;
    this.applyDrag(this.getLocalPoint(event));
    this.render();
  };

  private handlePointerUp = (event: PointerEvent): void => {
    if (this.mode !== 'dragging' || this.dragPointerId !== event.pointerId) {
      return;
    }

    this.ignoreNextChartClick = this.didDrag;

    this.activeDragTarget = null;
    this.dragPointerId = null;
    this.dragStartPoint = null;
    this.dragStateSnapshot = null;
    this.didDrag = false;
    this.mode = 'ready';
    this.render();
  };

  private applyDrag(point: Point): void {
    const snapshot = this.dragStateSnapshot;

    if (!snapshot) {
      return;
    }

    switch (this.activeDragTarget) {
      case 'body':
        this.moveWhole(snapshot, point);
        break;
      case 'entry':
        this.moveEntry(snapshot, point);
        break;
      case 'target':
        this.moveTarget(snapshot, point);
        break;
      case 'stop':
        this.moveStop(snapshot, point);
        break;
      case 'end':
        this.resizeEnd(snapshot, point);
        break;
      default:
        break;
    }
  }

  private moveEntry(snapshot: SliderPositionState, point: Point): void {
    if (snapshot.stopPrice === null || snapshot.targetPrice === null) {
      return;
    }

    const nextPrice = getPriceFromYCoordinate(this.series, point.y);

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

    const minDistance = this.getEditMinimumDistance();
    const low = Math.min(snapshot.stopPrice, snapshot.targetPrice) + minDistance;
    const high = Math.max(snapshot.stopPrice, snapshot.targetPrice) - minDistance;

    if (low > high) {
      return;
    }

    this.entryPrice = Math.max(low, Math.min(nextPrice, high));
  }

  private moveWhole(snapshot: SliderPositionState, point: Point): void {
    if (snapshot.startTime === null || snapshot.endTime === null) {
      return;
    }

    if (snapshot.entryPrice === null || snapshot.stopPrice === null || snapshot.targetPrice === null) {
      return;
    }

    if (!this.dragStartPoint) {
      return;
    }

    const timeOffset = point.x - this.dragStartPoint.x;
    const priceOffset = this.getPriceDelta(this.dragStartPoint.y, point.y);

    const nextStartTime = this.shiftTime(snapshot.startTime, timeOffset);
    const nextEndTime = this.shiftTime(snapshot.endTime, timeOffset);

    if (nextStartTime === null || nextEndTime === null) {
      return;
    }

    let nextEntryPrice = snapshot.entryPrice + priceOffset;
    let nextStopPrice = snapshot.stopPrice + priceOffset;
    let nextTargetPrice = snapshot.targetPrice + priceOffset;

    const range = this.getPriceScaleRange();

    if (range) {
      const minValue = Math.min(nextEntryPrice, nextStopPrice, nextTargetPrice);
      const maxValue = Math.max(nextEntryPrice, nextStopPrice, nextTargetPrice);

      if (minValue < range.min) {
        const shift = range.min - minValue;
        nextEntryPrice += shift;
        nextStopPrice += shift;
        nextTargetPrice += shift;
      }

      if (maxValue > range.max) {
        const shift = maxValue - range.max;
        nextEntryPrice -= shift;
        nextStopPrice -= shift;
        nextTargetPrice -= shift;
      }
    }

    this.startTime = nextStartTime;
    this.endTime = nextEndTime;
    this.entryPrice = nextEntryPrice;
    this.stopPrice = nextStopPrice;
    this.targetPrice = nextTargetPrice;
  }

  private moveStop(snapshot: SliderPositionState, point: Point): void {
    if (snapshot.entryPrice === null) {
      return;
    }

    const nextPrice = getPriceFromYCoordinate(this.series, point.y);

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

    this.stopPrice = this.normalizeStop(
      snapshot.entryPrice,
      this.clampPriceToRange(nextPrice),
      this.getEditMinimumDistance(),
    );
  }

  private moveTarget(snapshot: SliderPositionState, point: Point): void {
    if (snapshot.entryPrice === null) {
      return;
    }

    const nextPrice = getPriceFromYCoordinate(this.series, point.y);

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

    this.targetPrice = this.normalizeTarget(
      snapshot.entryPrice,
      this.clampPriceToRange(nextPrice),
      this.getEditMinimumDistance(),
    );
  }

  private resizeEnd(snapshot: SliderPositionState, point: Point): void {
    const nextEndTime = getTimeFromXCoordinate(this.chart, point.x);

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

    this.startTime = snapshot.startTime;
    this.endTime = nextEndTime;
  }

  private createAnchor(params: MouseEventParams<Time>): { time: Time; price: number } | null {
    if (!params.point || params.time === undefined) {
      return null;
    }

    const price = getPriceFromYCoordinate(this.series, params.point.y);

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

    return {
      time: params.time,
      price,
    };
  }

  private normalizeStop(entryPrice: number, rawPrice: number, minDistance = this.getEditMinimumDistance()): number {
    const distance = this.getAllowedMinimumDistance(entryPrice, 'stop', minDistance);

    return this.side === 'long' ? Math.min(rawPrice, entryPrice - distance) : Math.max(rawPrice, entryPrice + distance);
  }

  private normalizeTarget(entryPrice: number, rawPrice: number, minDistance = this.getEditMinimumDistance()): number {
    const distance = this.getAllowedMinimumDistance(entryPrice, 'target', minDistance);

    return this.side === 'long' ? Math.max(rawPrice, entryPrice + distance) : Math.min(rawPrice, entryPrice - distance);
  }

  private getAllowedMinimumDistance(entryPrice: number, kind: 'stop' | 'target', minDistance: number): number {
    const range = this.getPriceScaleRange();

    if (!range) {
      return minDistance;
    }

    const availableDistance =
      this.side === 'long'
        ? kind === 'stop'
          ? Math.max(entryPrice - range.min, 0)
          : Math.max(range.max - entryPrice, 0)
        : kind === 'stop'
          ? Math.max(range.max - entryPrice, 0)
          : Math.max(entryPrice - range.min, 0);

    return Math.min(minDistance, availableDistance);
  }

  private clampPriceToRange(price: number): number {
    const range = this.getPriceScaleRange();

    if (!range) {
      return price;
    }

    return Math.max(range.min, Math.min(price, range.max));
  }

  private getInitialZoneDistance(entryPrice: number): number {
    const fallback = Math.max(Math.abs(entryPrice) * 0.0075, this.tickSize * 3, MIN_DISTANCE);
    const range = this.getPriceScaleRange();

    if (!range) {
      return fallback;
    }

    const size = range.max - range.min;

    if (size <= 0) {
      return fallback;
    }

    return Math.max(size * 0.05, this.tickSize * 3, MIN_DISTANCE);
  }

  private getEditMinimumDistance(): number {
    return Math.max(this.tickSize, MIN_DISTANCE);
  }

  private getPriceScaleRange(): { min: number; max: number } | null {
    return getPriceRangeInContainer(this.series, this.container);
  }

  private getPriceDelta(fromY: number, toY: number): number {
    return getPriceDeltaFromCoordinates(this.series, fromY, toY);
  }

  private shiftTime(time: Time, offsetX: number): Time | null {
    return shiftTimeByPixels(this.chart, time, offsetX);
  }

  private getCurrentRiskRewardRatio(): number {
    if (this.entryPrice === null || this.stopPrice === null || this.targetPrice === null) {
      return this.defaultRiskRewardRatio;
    }

    const risk = Math.abs(this.entryPrice - this.stopPrice);

    if (!risk) {
      return this.defaultRiskRewardRatio;
    }

    return Math.abs(this.targetPrice - this.entryPrice) / risk;
  }

  private getPriceAtTime(time: Time | null): number | null {
    if (typeof time !== 'number') {
      return null;
    }

    const data = this.series.data() ?? [];
    let lastPrice: number | null = null;

    for (const item of data) {
      if (typeof item.time !== 'number') {
        continue;
      }

      if (item.time > time) {
        break;
      }

      if ('close' in item && typeof item.close === 'number') {
        lastPrice = item.close;
        continue;
      }

      if ('value' in item && typeof item.value === 'number') {
        lastPrice = item.value;
      }
    }

    return lastPrice;
  }

  private getGeometry(): SliderGeometry | null {
    if (this.startTime === null || this.endTime === null) {
      return null;
    }

    if (this.entryPrice === null || this.stopPrice === null || this.targetPrice === null) {
      return null;
    }

    const startX = getXCoordinateFromTime(this.chart, this.startTime);
    const endX = getXCoordinateFromTime(this.chart, this.endTime);
    const entryY = getYCoordinateFromPrice(this.series, this.entryPrice);
    const stopY = getYCoordinateFromPrice(this.series, this.stopPrice);
    const targetY = getYCoordinateFromPrice(this.series, this.targetPrice);

    if (startX === null || endX === null || entryY === null || stopY === null || targetY === null) {
      return null;
    }

    const start = Number(startX);
    const end = Number(endX);
    const entry = Number(entryY);
    const stop = Number(stopY);
    const target = Number(targetY);

    return {
      startX: start,
      endX: end,
      leftX: Math.min(start, end),
      rightX: Math.max(start, end),
      entryY: entry,
      stopY: stop,
      targetY: target,
      entryPrice: this.entryPrice,
      stopPrice: this.stopPrice,
      targetPrice: this.targetPrice,
      profitTop: Math.min(target, entry),
      profitBottom: Math.max(target, entry),
      lossTop: Math.min(stop, entry),
      lossBottom: Math.max(stop, entry),
    };
  }

  private getTargetText(geometry: SliderGeometry): string {
    const diff = Math.abs(geometry.targetPrice - geometry.entryPrice);
    const percent = geometry.entryPrice !== 0 ? (diff / Math.abs(geometry.entryPrice)) * 100 : 0;
    const ticks = this.tickSize > 0 ? diff / this.tickSize : 0;

    const formattedDiff = formatPrice(diff) ?? '0';
    const formattedTicks = formatPrice(ticks) ?? '0';
    const formattedAmount = formatPrice(this.amount) ?? '0';

    return `Target: ${formattedDiff} (${formatPercent(percent)}) ${formattedTicks}, Amount: ${formattedAmount}`;
  }

  private getCenterText(qty: number, pnl: number): string {
    const formattedQty = formatPrice(qty) ?? '0';
    const formattedRatio = formatPrice(this.getCurrentRiskRewardRatio()) ?? '0';

    return `Open P&L: ${formatSignedNumber(pnl)}, Qty: ${formattedQty}\nRisk/Reward Ratio: ${formattedRatio}`;
  }

  private getStopText(geometry: SliderGeometry): string {
    const stopDiff = Math.abs(geometry.stopPrice - geometry.entryPrice);
    const rewardDiff = Math.abs(geometry.targetPrice - geometry.entryPrice);
    const percent = geometry.entryPrice !== 0 ? (stopDiff / Math.abs(geometry.entryPrice)) * 100 : 0;
    const ticks = this.tickSize > 0 ? stopDiff / this.tickSize : 0;
    const qty = rewardDiff > 0 ? this.amount / rewardDiff : 0;
    const stopAmount = stopDiff * qty;

    const formattedStopDiff = formatPrice(stopDiff) ?? '0';
    const formattedTicks = formatPrice(ticks) ?? '0';
    const formattedStopAmount = formatPrice(stopAmount) ?? '0';

    return `Stop: ${formattedStopDiff} (${formatPercent(percent)}) ${formattedTicks}, Amount: ${formattedStopAmount}`;
  }

  private getHandleTarget(point: Point): DragTarget {
    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    if (isNearPoint(point, geometry.startX, geometry.entryY, HIT_TOLERANCE)) {
      return 'entry';
    }

    if (isNearPoint(point, geometry.startX, geometry.targetY, HIT_TOLERANCE)) {
      return 'target';
    }

    if (isNearPoint(point, geometry.startX, geometry.stopY, HIT_TOLERANCE)) {
      return 'stop';
    }

    if (isNearPoint(point, geometry.endX, geometry.entryY, HIT_TOLERANCE)) {
      return 'end';
    }

    const minY = Math.min(geometry.targetY, geometry.stopY);
    const maxY = Math.max(geometry.targetY, geometry.stopY);

    const bounds: Bounds = {
      left: geometry.leftX,
      right: geometry.rightX,
      top: minY,
      bottom: maxY,
    };

    if (isPointInBounds(point, bounds)) {
      return 'body';
    }

    return null;
  }

  private containsPoint(point: Point): boolean {
    const geometry = this.getGeometry();

    if (!geometry) {
      return false;
    }

    const minY = Math.min(geometry.targetY, geometry.stopY);
    const maxY = Math.max(geometry.targetY, geometry.stopY);

    const bounds: Bounds = {
      left: geometry.leftX,
      right: geometry.rightX,
      top: minY,
      bottom: maxY,
    };

    return isPointInBounds(point, bounds, HIT_TOLERANCE);
  }

  private getLocalPoint(event: PointerEvent): Point {
    return getPointerPointFromEvent(this.container, event);
  }

  private render(): void {
    this.updateAllViews();
    this.requestUpdate?.();
  }
}



import {
  AutoscaleInfo,
  CrosshairMode,
  IChartApi,
  IPrimitivePaneView,
  Logical,
  PrimitiveHoveredItem,
  SeriesAttachedParameter,
  SeriesOptionsMap,
  Time,
  UTCTimestamp,
} from 'lightweight-charts';
import { Observable, Subscription } from 'rxjs';

import {
  CustomPriceAxisPaneView,
  CustomPriceAxisView,
  CustomTimeAxisPaneView,
  CustomTimeAxisView,
} from '@core/Drawings/axis';
import {
  getAnchorFromPoint,
  getPointerPoint as getPointerPointFromEvent,
  getPriceDelta as getPriceDeltaFromCoordinates,
  getXCoordinateFromTime,
  getYCoordinateFromPrice,
  isNearPoint,
  shiftTimeByPixels,
} from '@core/Drawings/helpers';
import { updateViews } from '@core/Drawings/utils';

import { getThemeStore } from '@src/theme';
import { Defaults } from '@src/types/defaults';
import { formatPrice } from '@src/utils';
import { formatDate } from '@src/utils/formatter';

import { TrendLinePaneView } from './paneView';

import type { ISeriesDrawing } from '@core/Drawings/common';
import type { Anchor, AxisLabel, AxisSegment, Point, SeriesApi } from '@core/Drawings/types';
import type { ChartOptionsModel } from '@src/types';

type TrendLineMode = 'idle' | 'drawing' | 'ready' | 'dragging-start' | 'dragging-end' | 'dragging-body';
type TimeLabelKind = 'start' | 'end';
type PriceLabelKind = 'start' | 'end';

interface TrendLineParams {
  container: HTMLElement;
  formatObservable?: Observable<ChartOptionsModel>;
  removeSelf?: () => void;
}

interface TrendLineState {
  hidden: boolean;
  isActive: boolean;
  mode: TrendLineMode;
  startAnchor: Anchor | null;
  endAnchor: Anchor | null;
}

interface TrendLineGeometry {
  startPoint: Point;
  endPoint: Point;
  left: number;
  right: number;
  top: number;
  bottom: number;
}

export interface TrendLineRenderData extends TrendLineGeometry {
  showHandles: boolean;
}

const LINE_HIT_TOLERANCE = 6;
const MIN_LINE_SIZE = 4;

const { colors } = getThemeStore();

export class TrendLine implements ISeriesDrawing {
  private chart: IChartApi;
  private series: SeriesApi;
  private container: HTMLElement;
  private removeSelf?: () => void;

  private requestUpdate: (() => void) | null = null;
  private subscriptions = new Subscription();
  private isBound = false;

  private hidden = false;
  private isActive = false;
  private mode: TrendLineMode = 'idle';

  private startAnchor: Anchor | null = null;
  private endAnchor: Anchor | null = null;

  private dragPointerId: number | null = null;
  private dragStartPoint: Point | null = null;
  private dragStateSnapshot: TrendLineState | null = null;

  private displayFormat: ChartOptionsModel = {
    dateFormat: Defaults.dateFormat,
    timeFormat: Defaults.timeFormat,
    showTime: Defaults.showTime,
  };

  private readonly paneView: TrendLinePaneView;
  private readonly timeAxisPaneView: CustomTimeAxisPaneView;
  private readonly priceAxisPaneView: CustomPriceAxisPaneView;
  private readonly startTimeAxisView: CustomTimeAxisView;
  private readonly endTimeAxisView: CustomTimeAxisView;
  private readonly startPriceAxisView: CustomPriceAxisView;
  private readonly endPriceAxisView: CustomPriceAxisView;

  constructor(chart: IChartApi, series: SeriesApi, { container, formatObservable, removeSelf }: TrendLineParams) {
    this.chart = chart;
    this.series = series;
    this.container = container;
    this.removeSelf = removeSelf;

    this.paneView = new TrendLinePaneView(this);

    this.timeAxisPaneView = new CustomTimeAxisPaneView({
      getAxisSegments: () => this.getTimeAxisSegments(),
    });

    this.priceAxisPaneView = new CustomPriceAxisPaneView({
      getAxisSegments: () => this.getPriceAxisSegments(),
    });

    this.startTimeAxisView = new CustomTimeAxisView({
      getAxisLabel: (kind) => this.getTimeAxisLabel(kind),
      labelKind: 'start',
    });

    this.endTimeAxisView = new CustomTimeAxisView({
      getAxisLabel: (kind) => this.getTimeAxisLabel(kind),
      labelKind: 'end',
    });

    this.startPriceAxisView = new CustomPriceAxisView({
      getAxisLabel: (kind) => this.getPriceAxisLabel(kind),
      labelKind: 'start',
    });

    this.endPriceAxisView = new CustomPriceAxisView({
      getAxisLabel: (kind) => this.getPriceAxisLabel(kind),
      labelKind: 'end',
    });

    if (formatObservable) {
      this.subscriptions.add(
        formatObservable.subscribe((format) => {
          this.displayFormat = format;
          this.render();
        }),
      );
    }

    this.series.attachPrimitive(this);
  }

  public show(): void {
    this.hidden = false;
    this.render();
  }

  public hide(): void {
    this.hidden = true;
    this.showCrosshair();
    this.render();
  }

  public destroy(): void {
    this.showCrosshair();
    this.unbindEvents();
    this.subscriptions.unsubscribe();
    this.series.detachPrimitive(this);
    this.requestUpdate = null;
  }

  public rebind(series: SeriesApi): void {
    if (this.series === series) {
      return;
    }

    this.showCrosshair();
    this.unbindEvents();
    this.series.detachPrimitive(this);

    this.series = series;
    this.requestUpdate = null;

    this.series.attachPrimitive(this);
    this.render();
  }

  public getState(): TrendLineState {
    return {
      hidden: this.hidden,
      isActive: this.isActive,
      mode: this.mode,
      startAnchor: this.startAnchor,
      endAnchor: this.endAnchor,
    };
  }

  public setState(state: unknown): void {
    const nextState = state as Partial<TrendLineState>;

    if ('hidden' in nextState && typeof nextState.hidden === 'boolean') {
      this.hidden = nextState.hidden;
    }

    if ('isActive' in nextState && typeof nextState.isActive === 'boolean') {
      this.isActive = nextState.isActive;
    }

    if ('mode' in nextState && nextState.mode) {
      this.mode = nextState.mode;
    }

    if ('startAnchor' in nextState) {
      this.startAnchor = nextState.startAnchor ?? null;
    }

    if ('endAnchor' in nextState) {
      this.endAnchor = nextState.endAnchor ?? null;
    }

    this.render();
  }

  public attached(param: SeriesAttachedParameter<Time, keyof SeriesOptionsMap>): void {
    this.requestUpdate = param.requestUpdate;
    this.bindEvents();
  }

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

  public updateAllViews(): void {
    updateViews([
      this.paneView,
      this.timeAxisPaneView,
      this.priceAxisPaneView,
      this.startTimeAxisView,
      this.endTimeAxisView,
      this.startPriceAxisView,
      this.endPriceAxisView,
    ]);
  }

  public paneViews(): readonly IPrimitivePaneView[] {
    return [this.paneView];
  }

  public timeAxisPaneViews(): readonly IPrimitivePaneView[] {
    return [this.timeAxisPaneView];
  }

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

  public timeAxisViews() {
    return [this.startTimeAxisView, this.endTimeAxisView];
  }

  public priceAxisViews() {
    return [this.startPriceAxisView, this.endPriceAxisView];
  }

  public autoscaleInfo(_start: Logical, _end: Logical): AutoscaleInfo | null {
    return null;
  }

  public getRenderData(): TrendLineRenderData | null {
    if (this.hidden) {
      return null;
    }

    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    return {
      ...geometry,
      showHandles: this.isActive,
    };
  }

  public hitTest(x: number, y: number): PrimitiveHoveredItem | null {
    if (this.hidden || this.mode === 'idle' || this.mode === 'drawing') {
      return null;
    }

    const point = { x, y };

    if (this.getPointTarget(point)) {
      return {
        cursorStyle: 'move',
        externalId: 'trend-line',
        zOrder: 'top',
      };
    }

    if (!this.isPointNearLine(point)) {
      return null;
    }

    return {
      cursorStyle: 'grab',
      externalId: 'trend-line',
      zOrder: 'top',
    };
  }

  public getTimeAxisSegments(): AxisSegment[] {
    if (!this.isActive) {
      return [];
    }

    const geometry = this.getGeometry();

    if (!geometry) {
      return [];
    }

    return [
      {
        from: geometry.left,
        to: geometry.right,
        color: colors.axisMarkerAreaFill,
      },
    ];
  }

  public getPriceAxisSegments(): AxisSegment[] {
    if (!this.isActive) {
      return [];
    }

    const geometry = this.getGeometry();

    if (!geometry) {
      return [];
    }

    return [
      {
        from: geometry.top,
        to: geometry.bottom,
        color: colors.axisMarkerAreaFill,
      },
    ];
  }

  public getTimeAxisLabel(kind: string): AxisLabel | null {
    if (!this.isActive || (kind !== 'start' && kind !== 'end')) {
      return null;
    }

    const coordinate = this.getTimeCoordinate(kind);
    const text = this.getTimeText(kind);

    if (coordinate === null || !text) {
      return null;
    }

    return {
      coordinate,
      text,
      textColor: colors.chartPriceLineText,
      backgroundColor: colors.axisMarkerLabelFill,
    };
  }

  public getPriceAxisLabel(kind: string): AxisLabel | null {
    if (!this.isActive || (kind !== 'start' && kind !== 'end')) {
      return null;
    }

    const coordinate = this.getPriceCoordinate(kind);
    const text = this.getPriceText(kind);

    if (coordinate === null || !text) {
      return null;
    }

    return {
      coordinate,
      text,
      textColor: colors.chartPriceLineText,
      backgroundColor: colors.axisMarkerLabelFill,
    };
  }

  private bindEvents(): void {
    if (this.isBound) {
      return;
    }

    this.isBound = true;

    this.container.addEventListener('pointerdown', this.handlePointerDown);
    window.addEventListener('pointermove', this.handlePointerMove);
    window.addEventListener('pointerup', this.handlePointerUp);
    window.addEventListener('pointercancel', this.handlePointerUp);
  }

  private unbindEvents(): void {
    if (!this.isBound) {
      return;
    }

    this.isBound = false;

    this.container.removeEventListener('pointerdown', this.handlePointerDown);
    window.removeEventListener('pointermove', this.handlePointerMove);
    window.removeEventListener('pointerup', this.handlePointerUp);
    window.removeEventListener('pointercancel', this.handlePointerUp);
  }

  private handlePointerDown = (event: PointerEvent): void => {
    if (this.hidden || event.button !== 0) {
      return;
    }

    const point = this.getEventPoint(event);

    if (this.mode === 'idle') {
      event.preventDefault();
      event.stopPropagation();

      this.startDrawing(point);
      return;
    }

    if (this.mode === 'drawing') {
      event.preventDefault();
      event.stopPropagation();

      this.updateDrawing(point);
      this.finishDrawing();
      return;
    }

    if (this.mode !== 'ready') {
      return;
    }

    const pointTarget = this.getPointTarget(point);

    if (!this.isActive) {
      if (!pointTarget && !this.isPointNearLine(point)) {
        return;
      }

      event.preventDefault();
      event.stopPropagation();

      this.isActive = true;
      this.render();
      return;
    }

    if (pointTarget === 'start') {
      event.preventDefault();
      event.stopPropagation();

      this.startDragging('dragging-start', point, event.pointerId);
      return;
    }

    if (pointTarget === 'end') {
      event.preventDefault();
      event.stopPropagation();

      this.startDragging('dragging-end', point, event.pointerId);
      return;
    }

    if (this.isPointNearLine(point)) {
      event.preventDefault();
      event.stopPropagation();

      this.startDragging('dragging-body', point, event.pointerId);
      return;
    }

    this.isActive = false;
    this.render();
  };

  private handlePointerMove = (event: PointerEvent): void => {
    const point = this.getEventPoint(event);

    if (this.mode === 'drawing') {
      this.updateDrawing(point);
      return;
    }

    if (this.dragPointerId !== event.pointerId) {
      return;
    }

    if (this.mode === 'dragging-start' || this.mode === 'dragging-end') {
      event.preventDefault();
      event.stopPropagation();

      this.movePoint(point);
      this.render();
      return;
    }

    if (this.mode === 'dragging-body') {
      event.preventDefault();
      event.stopPropagation();

      this.moveBody(point);
      this.render();
    }
  };

  private handlePointerUp = (event: PointerEvent): void => {
    if (this.dragPointerId !== event.pointerId) {
      return;
    }

    if (this.mode === 'dragging-start' || this.mode === 'dragging-end' || this.mode === 'dragging-body') {
      this.finishDragging();
    }
  };

  private startDrawing(point: Point): void {
    const anchor = this.createAnchor(point);

    if (!anchor) {
      return;
    }

    this.startAnchor = anchor;
    this.endAnchor = anchor;
    this.isActive = true;
    this.mode = 'drawing';
    this.render();
  }

  private updateDrawing(point: Point): void {
    const anchor = this.createAnchor(point);

    if (!anchor) {
      return;
    }

    this.endAnchor = anchor;
    this.render();
  }

  private finishDrawing(): void {
    const geometry = this.getGeometry();

    if (!geometry) {
      return;
    }

    const lineSize = Math.hypot(
      geometry.endPoint.x - geometry.startPoint.x,
      geometry.endPoint.y - geometry.startPoint.y,
    );

    if (lineSize < MIN_LINE_SIZE) {
      this.removeSelf?.();
      return;
    }

    this.mode = 'ready';
    this.render();
  }

  private startDragging(mode: TrendLineMode, point: Point, pointerId: number): void {
    this.mode = mode;
    this.dragPointerId = pointerId;
    this.dragStartPoint = point;
    this.dragStateSnapshot = this.getState();

    this.hideCrosshair();
    this.render();
  }

  private finishDragging(): void {
    this.mode = 'ready';
    this.dragPointerId = null;
    this.dragStartPoint = null;
    this.dragStateSnapshot = null;

    this.showCrosshair();
    this.render();
  }

  private movePoint(point: Point): void {
    const anchor = this.createAnchor(point);

    if (!anchor) {
      return;
    }

    if (this.mode === 'dragging-start') {
      this.startAnchor = anchor;
    }

    if (this.mode === 'dragging-end') {
      this.endAnchor = anchor;
    }
  }

  private moveBody(point: Point): void {
    const snapshot = this.dragStateSnapshot;

    if (!snapshot?.startAnchor || !snapshot.endAnchor || !this.dragStartPoint) {
      return;
    }

    const offsetX = point.x - this.dragStartPoint.x;
    const priceOffset = getPriceDeltaFromCoordinates(this.series, this.dragStartPoint.y, point.y);

    const nextStartTime = shiftTimeByPixels(this.chart, snapshot.startAnchor.time, offsetX);
    const nextEndTime = shiftTimeByPixels(this.chart, snapshot.endAnchor.time, offsetX);

    if (nextStartTime === null || nextEndTime === null) {
      return;
    }

    this.startAnchor = {
      time: nextStartTime,
      price: snapshot.startAnchor.price + priceOffset,
    };

    this.endAnchor = {
      time: nextEndTime,
      price: snapshot.endAnchor.price + priceOffset,
    };
  }

  private createAnchor(point: Point): Anchor | null {
    return getAnchorFromPoint(this.chart, this.series, point);
  }

  private getGeometry(): TrendLineGeometry | null {
    if (!this.startAnchor || !this.endAnchor) {
      return null;
    }

    const startX = getXCoordinateFromTime(this.chart, this.startAnchor.time);
    const endX = getXCoordinateFromTime(this.chart, this.endAnchor.time);
    const startY = getYCoordinateFromPrice(this.series, this.startAnchor.price);
    const endY = getYCoordinateFromPrice(this.series, this.endAnchor.price);

    if (startX === null || endX === null || startY === null || endY === null) {
      return null;
    }

    const startPoint = {
      x: Math.round(Number(startX)),
      y: Math.round(Number(startY)),
    };

    const endPoint = {
      x: Math.round(Number(endX)),
      y: Math.round(Number(endY)),
    };

    return {
      startPoint,
      endPoint,
      left: Math.min(startPoint.x, endPoint.x),
      right: Math.max(startPoint.x, endPoint.x),
      top: Math.min(startPoint.y, endPoint.y),
      bottom: Math.max(startPoint.y, endPoint.y),
    };
  }

  private getPointTarget(point: Point): 'start' | 'end' | null {
    const geometry = this.getGeometry();

    if (!geometry) {
      return null;
    }

    if (isNearPoint(point, geometry.startPoint.x, geometry.startPoint.y, 8)) {
      return 'start';
    }

    if (isNearPoint(point, geometry.endPoint.x, geometry.endPoint.y, 8)) {
      return 'end';
    }

    return null;
  }

  private isPointNearLine(point: Point): boolean {
    const geometry = this.getGeometry();

    if (!geometry) {
      return false;
    }

    return this.getDistanceToSegment(point, geometry.startPoint, geometry.endPoint) <= LINE_HIT_TOLERANCE;
  }

  private getDistanceToSegment(point: Point, startPoint: Point, endPoint: Point): number {
    const dx = endPoint.x - startPoint.x;
    const dy = endPoint.y - startPoint.y;

    if (dx === 0 && dy === 0) {
      return Math.hypot(point.x - startPoint.x, point.y - startPoint.y);
    }

    const t = Math.max(
      0,
      Math.min(1, ((point.x - startPoint.x) * dx + (point.y - startPoint.y) * dy) / (dx * dx + dy * dy)),
    );

    const projectionX = startPoint.x + t * dx;
    const projectionY = startPoint.y + t * dy;

    return Math.hypot(point.x - projectionX, point.y - projectionY);
  }

  private getTimeCoordinate(kind: TimeLabelKind): number | null {
    const anchor = kind === 'start' ? this.startAnchor : this.endAnchor;

    if (!anchor) {
      return null;
    }

    const coordinate = getXCoordinateFromTime(this.chart, anchor.time);

    return coordinate === null ? null : Number(coordinate);
  }

  private getPriceCoordinate(kind: PriceLabelKind): number | null {
    const anchor = kind === 'start' ? this.startAnchor : this.endAnchor;

    if (!anchor) {
      return null;
    }

    const coordinate = getYCoordinateFromPrice(this.series, anchor.price);

    return coordinate === null ? null : Number(coordinate);
  }

  private getTimeText(kind: TimeLabelKind): string {
    const anchor = kind === 'start' ? this.startAnchor : this.endAnchor;

    if (!anchor || typeof anchor.time !== 'number') {
      return '';
    }

    return formatDate(
      anchor.time as UTCTimestamp,
      this.displayFormat.dateFormat,
      this.displayFormat.timeFormat,
      this.displayFormat.showTime,
    );
  }

  private getPriceText(kind: PriceLabelKind): string {
    const anchor = kind === 'start' ? this.startAnchor : this.endAnchor;

    if (!anchor) {
      return '';
    }

    return formatPrice(anchor.price) ?? '';
  }

  private hideCrosshair(): void {
    this.chart.applyOptions({
      crosshair: {
        mode: CrosshairMode.Hidden,
      },
    });
  }

  private showCrosshair(): void {
    this.chart.applyOptions({
      crosshair: {
        mode: CrosshairMode.Normal,
      },
    });
  }

  private getEventPoint(event: PointerEvent): Point {
    return getPointerPointFromEvent(this.container, event);
  }

  private render(): void {
    this.updateAllViews();
    this.requestUpdate?.();
  }
}