// Copyright 2023 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
/* eslint-disable rulesdir/no-imperative-dom-api */

import * as Common from '../../core/common/common.js';
import * as Trace from '../../models/trace/trace.js';
import * as TraceBounds from '../../services/trace_bounds/trace_bounds.js';
import * as PerfUI from '../../ui/legacy/components/perf_ui/perf_ui.js';
import * as UI from '../../ui/legacy/legacy.js';

import * as TimelineComponents from './components/components.js';
import {ModificationsManager} from './ModificationsManager.js';
import {
  type TimelineEventOverview,
  TimelineEventOverviewCPUActivity,
  TimelineEventOverviewMemory,
  TimelineEventOverviewNetwork,
  TimelineEventOverviewResponsiveness,
  TimelineFilmStripOverview,
} from './TimelineEventOverview.js';
import miniMapStyles from './timelineMiniMap.css.js';
import {TimelineUIUtils} from './TimelineUIUtils.js';

export interface OverviewData {
  parsedTrace: Trace.TraceModel.ParsedTrace;
  isCpuProfile?: boolean;
  settings: {
    showScreenshots: boolean,
    showMemory: boolean,
  };
}

/**
 * This component wraps the generic PerfUI Overview component and configures it
 * specifically for the Performance Panel, including injecting the CSS we use
 * to customize how the components render within the Performance Panel.
 *
 * It is also responsible for listening to events from the OverviewPane to
 * update the visible trace window, and when this happens it will update the
 * TraceBounds service with the new values.
 */
export class TimelineMiniMap extends
    Common.ObjectWrapper.eventMixin<PerfUI.TimelineOverviewPane.EventTypes, typeof UI.Widget.VBox>(UI.Widget.VBox) {
  #overviewComponent = new PerfUI.TimelineOverviewPane.TimelineOverviewPane('timeline');
  #controls: TimelineEventOverview[] = [];
  breadcrumbs: TimelineComponents.Breadcrumbs.Breadcrumbs|null = null;
  #breadcrumbsUI: TimelineComponents.BreadcrumbsUI.BreadcrumbsUI;
  #data: OverviewData|null = null;

  #onTraceBoundsChangeBound = this.#onTraceBoundsChange.bind(this);

  constructor() {
    super();
    this.registerRequiredCSS(miniMapStyles);
    this.element.classList.add('timeline-minimap', 'no-trace-active');
    this.#breadcrumbsUI = new TimelineComponents.BreadcrumbsUI.BreadcrumbsUI();
    this.element.prepend(this.#breadcrumbsUI);

    this.#overviewComponent.show(this.element);

    this.#overviewComponent.addEventListener(PerfUI.TimelineOverviewPane.Events.OVERVIEW_PANE_WINDOW_CHANGED, event => {
      this.#onOverviewPanelWindowChanged(event);
    });
    this.#overviewComponent.addEventListener(
        PerfUI.TimelineOverviewPane.Events.OVERVIEW_PANE_BREADCRUMB_ADDED, event => {
          this.addBreadcrumb(event.data);
        });

    // We want to add/remove an overlay for these two events, and the overlay system is controlled by
    // `TimelineFlameChartView`, so we need to dispatch them up to the `TimelinePanel` level to call
    // `TimelineFlameChartView` -> `addOverlay()/removeOverlay()`.
    this.#overviewComponent.addEventListener(PerfUI.TimelineOverviewPane.Events.OVERVIEW_PANE_MOUSE_MOVE, event => {
      this.dispatchEventToListeners(PerfUI.TimelineOverviewPane.Events.OVERVIEW_PANE_MOUSE_MOVE, event.data);
    });
    this.#overviewComponent.addEventListener(PerfUI.TimelineOverviewPane.Events.OVERVIEW_PANE_MOUSE_LEAVE, () => {
      this.dispatchEventToListeners(PerfUI.TimelineOverviewPane.Events.OVERVIEW_PANE_MOUSE_LEAVE);
    });

    this.#breadcrumbsUI.addEventListener(TimelineComponents.BreadcrumbsUI.BreadcrumbActivatedEvent.eventName, event => {
      const {breadcrumb, childBreadcrumbsRemoved} =
          (event as TimelineComponents.BreadcrumbsUI.BreadcrumbActivatedEvent);
      this.#activateBreadcrumb(
          breadcrumb, {removeChildBreadcrumbs: Boolean(childBreadcrumbsRemoved), updateVisibleWindow: true});
    });
    this.#overviewComponent.enableCreateBreadcrumbsButton();

    TraceBounds.TraceBounds.onChange(this.#onTraceBoundsChangeBound);
    // Set the initial bounds for the overview. Otherwise if we mount & there
    // is not an immediate RESET event, then we don't render correctly.
    const state = TraceBounds.TraceBounds.BoundsManager.instance().state();
    if (state) {
      const {timelineTraceWindow, minimapTraceBounds} = state.milli;
      this.#overviewComponent.setWindowTimes(timelineTraceWindow.min, timelineTraceWindow.max);
      this.#overviewComponent.setBounds(minimapTraceBounds.min, minimapTraceBounds.max);
    }
  }

  #onOverviewPanelWindowChanged(
      event: Common.EventTarget.EventTargetEvent<PerfUI.TimelineOverviewPane.OverviewPaneWindowChangedEvent>): void {
    const parsedTrace = this.#data?.parsedTrace;
    if (!parsedTrace) {
      return;
    }

    const traceBoundsState = TraceBounds.TraceBounds.BoundsManager.instance().state();
    if (!traceBoundsState) {
      return;
    }

    const left = (event.data.startTime > 0) ? event.data.startTime : traceBoundsState.milli.entireTraceBounds.min;
    const right =
        Number.isFinite(event.data.endTime) ? event.data.endTime : traceBoundsState.milli.entireTraceBounds.max;

    TraceBounds.TraceBounds.BoundsManager.instance().setTimelineVisibleWindow(
        Trace.Helpers.Timing.traceWindowFromMilliSeconds(
            Trace.Types.Timing.Milli(left),
            Trace.Types.Timing.Milli(right),
            ),
        {
          shouldAnimate: true,
        },
    );
  }

  #onTraceBoundsChange(event: TraceBounds.TraceBounds.StateChangedEvent): void {
    if (event.updateType === 'RESET' || event.updateType === 'VISIBLE_WINDOW') {
      this.#overviewComponent.setWindowTimes(
          event.state.milli.timelineTraceWindow.min, event.state.milli.timelineTraceWindow.max);

      // If the visible window has changed because we are revealing a certain
      // time period to the user, we need to ensure that this new time
      // period fits within the current minimap bounds. If it doesn't, we
      // do some work to update the minimap bounds. Note that this only
      // applies if the user has created breadcrumbs, which scope the
      // minimap. If they have not, the entire trace is the minimap, and
      // therefore there is no work to be done.
      const newWindowFitsBounds = Trace.Helpers.Timing.windowFitsInsideBounds({
        window: event.state.micro.timelineTraceWindow,
        bounds: event.state.micro.minimapTraceBounds,
      });

      if (!newWindowFitsBounds) {
        this.#updateMiniMapBoundsToFitNewWindow(event.state.micro.timelineTraceWindow);
      }
    }
    if (event.updateType === 'RESET' || event.updateType === 'MINIMAP_BOUNDS') {
      this.#overviewComponent.setBounds(
          event.state.milli.minimapTraceBounds.min, event.state.milli.minimapTraceBounds.max);
    }
  }

  #updateMiniMapBoundsToFitNewWindow(newWindow: Trace.Types.Timing.TraceWindowMicro): void {
    if (!this.breadcrumbs) {
      return;
    }
    // Find the smallest breadcrumb that fits this window.
    // Breadcrumbs are a linked list from largest to smallest so we have to
    // walk through until we find one that does not fit, and pick the last
    // before that.
    let currentBreadcrumb: Trace.Types.File.Breadcrumb|null = this.breadcrumbs.initialBreadcrumb;
    let lastBreadcrumbThatFits: Trace.Types.File.Breadcrumb = this.breadcrumbs.initialBreadcrumb;

    while (currentBreadcrumb) {
      const fits = Trace.Helpers.Timing.windowFitsInsideBounds({
        window: newWindow,
        bounds: currentBreadcrumb.window,
      });
      if (fits) {
        lastBreadcrumbThatFits = currentBreadcrumb;
      } else {
        // If this breadcrumb does not fit, none of its children (which are all
        // smaller by definition) will, so we can exit the loop early.
        break;
      }
      currentBreadcrumb = currentBreadcrumb.child;
    }

    // Activate the breadcrumb that fits the visible window. We do not update
    // the visible window here as we are doing this work as a reaction to
    // something else triggering a change in the window visibility.
    this.#activateBreadcrumb(lastBreadcrumbThatFits, {removeChildBreadcrumbs: false, updateVisibleWindow: false});
  }

  addBreadcrumb({startTime, endTime}: PerfUI.TimelineOverviewPane.OverviewPaneBreadcrumbAddedEvent): void {
    if (!this.breadcrumbs) {
      console.warn('ModificationsManager has not been created, therefore Breadcrumbs can not be added');
      return;
    }
    const traceBoundsState = TraceBounds.TraceBounds.BoundsManager.instance().state();
    if (!traceBoundsState) {
      return;
    }
    const bounds = traceBoundsState.milli.minimapTraceBounds;

    // The OverviewPane can emit 0 and Infinity as numbers for the range; in
    // this case we change them to be the min and max values of the minimap
    // bounds.
    const breadcrumbTimes = {
      startTime: Trace.Types.Timing.Milli(Math.max(startTime, bounds.min)),
      endTime: Trace.Types.Timing.Milli(Math.min(endTime, bounds.max)),
    };

    const newVisibleTraceWindow =
        Trace.Helpers.Timing.traceWindowFromMilliSeconds(breadcrumbTimes.startTime, breadcrumbTimes.endTime);

    const addedBreadcrumb = this.breadcrumbs.add(newVisibleTraceWindow);

    this.#breadcrumbsUI.data = {
      initialBreadcrumb: this.breadcrumbs.initialBreadcrumb,
      activeBreadcrumb: addedBreadcrumb,
    };
  }

  highlightBounds(bounds: Trace.Types.Timing.TraceWindowMicro, withBracket = false): void {
    this.#overviewComponent.highlightBounds(bounds, withBracket);
  }
  clearBoundsHighlight(): void {
    this.#overviewComponent.clearBoundsHighlight();
  }

  /**
   * Activates a given breadcrumb.
   * @param options.removeChildBreadcrumbs if true, any child breadcrumbs will be removed.
   * @param options.updateVisibleWindow if true, the visible window will be updated to match the bounds of the breadcrumb
   */
  #activateBreadcrumb(
      breadcrumb: Trace.Types.File.Breadcrumb,
      options: TimelineComponents.Breadcrumbs.SetActiveBreadcrumbOptions): void {
    if (!this.breadcrumbs) {
      return;
    }

    this.breadcrumbs.setActiveBreadcrumb(breadcrumb, options);
    // Only the initial breadcrumb is passed in because breadcrumbs are stored in a linked list and breadcrumbsUI component iterates through them
    this.#breadcrumbsUI.data = {
      initialBreadcrumb: this.breadcrumbs.initialBreadcrumb,
      activeBreadcrumb: breadcrumb,
    };
  }

  reset(): void {
    this.#data = null;
    this.#overviewComponent.reset();
  }

  #setMarkers(parsedTrace: Trace.TraceModel.ParsedTrace): void {
    const markers = new Map<number, HTMLDivElement>();

    const {Meta} = parsedTrace.data;

    // Only add markers for navigation start times.
    const navStartEvents = Meta.mainFrameNavigations;
    const minTimeInMilliseconds = Trace.Helpers.Timing.microToMilli(Meta.traceBounds.min);

    for (const event of navStartEvents) {
      const {startTime} = Trace.Helpers.Timing.eventTimingsMilliSeconds(event);
      markers.set(startTime, TimelineUIUtils.createEventDivider(event, minTimeInMilliseconds));
    }

    this.#overviewComponent.setMarkers(markers);
  }

  #setNavigationStartEvents(parsedTrace: Trace.TraceModel.ParsedTrace): void {
    this.#overviewComponent.setNavStartTimes(parsedTrace.data.Meta.mainFrameNavigations);
  }

  getControls(): TimelineEventOverview[] {
    return this.#controls;
  }

  setData(data: OverviewData|null): void {
    this.element.classList.toggle('no-trace-active', data === null);

    if (data === null) {
      this.#data = null;
      this.#controls = [];
      return;
    }

    if (this.#data?.parsedTrace === data.parsedTrace) {
      return;
    }
    this.#data = data;
    this.#controls = [];

    this.#setMarkers(data.parsedTrace);
    this.#setNavigationStartEvents(data.parsedTrace);
    this.#controls.push(new TimelineEventOverviewResponsiveness(data.parsedTrace));
    this.#controls.push(new TimelineEventOverviewCPUActivity(data.parsedTrace));

    this.#controls.push(new TimelineEventOverviewNetwork(data.parsedTrace));
    if (data.settings.showScreenshots) {
      const filmStrip = Trace.Extras.FilmStrip.fromHandlerData(data.parsedTrace.data);
      if (filmStrip.frames.length) {
        this.#controls.push(new TimelineFilmStripOverview(filmStrip));
      }
    }
    if (data.settings.showMemory) {
      this.#controls.push(new TimelineEventOverviewMemory(data.parsedTrace));
    }
    this.#overviewComponent.setOverviewControls(this.#controls);
    this.#overviewComponent.showingScreenshots = data.settings.showScreenshots;
    this.#setInitialBreadcrumb();
  }

  #setInitialBreadcrumb(): void {
    // Set the initial breadcrumb that ModificationsManager created from the initial full window
    // or loaded from the file.
    this.breadcrumbs = ModificationsManager.activeManager()?.getTimelineBreadcrumbs() ?? null;

    if (!this.breadcrumbs) {
      return;
    }

    let lastBreadcrumb = this.breadcrumbs.initialBreadcrumb;
    while (lastBreadcrumb.child !== null) {
      lastBreadcrumb = lastBreadcrumb.child;
    }

    this.#breadcrumbsUI.data = {
      initialBreadcrumb: this.breadcrumbs.initialBreadcrumb,
      activeBreadcrumb: lastBreadcrumb,
    };
  }
}