// Copyright 2018 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 @devtools/no-imperative-dom-api */

import * as Common from '../../core/common/common.js';
import * as i18n from '../../core/i18n/i18n.js';
import * as SDK from '../../core/sdk/sdk.js';
import * as UI from '../../ui/legacy/legacy.js';

const UIStrings = {
  /**
   * @description aria label for javascript VM instances target list in heap profiler
   */
  javascriptVmInstances: 'JavaScript VM instances',
  /**
   * @description Text in Isolate Selector of a profiler tool
   */
  totalJsHeapSize: 'Total JS heap size',
  /**
   * @description Total trend div title in Isolate Selector of a profiler tool
   * @example {3} PH1
   */
  totalPageJsHeapSizeChangeTrend: 'Total page JS heap size change trend over the last {PH1} minutes.',
  /**
   * @description Total value div title in Isolate Selector of a profiler tool
   */
  totalPageJsHeapSizeAcrossAllVm: 'Total page JS heap size across all VM instances.',
  /**
   * @description Heap size change trend measured in kB/s
   * @example {2 kB} PH1
   */
  changeRate: '{PH1}/s',
  /**
   * @description Text for isolate selector list items with positive change rate
   * @example {1.0 kB} PH1
   */
  increasingBySPerSecond: 'increasing by {PH1} per second',
  /**
   * @description Text for isolate selector list items with negative change rate
   * @example {1.0 kB} PH1
   */
  decreasingBySPerSecond: 'decreasing by {PH1} per second',
  /**
   * @description Heap div title in Isolate Selector of a profiler tool
   */
  heapSizeInUseByLiveJsObjects: 'Heap size in use by live JS objects.',
  /**
   * @description Trend div title in Isolate Selector of a profiler tool
   * @example {3} PH1
   */
  heapSizeChangeTrendOverTheLastS: 'Heap size change trend over the last {PH1} minutes.',
  /**
   * @description Text to show an item is empty
   */
  empty: '(empty)',
} as const;
const str_ = i18n.i18n.registerUIStrings('panels/profiler/IsolateSelector.ts', UIStrings);
const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);
export class IsolateSelector extends UI.Widget.VBox implements UI.ListControl.ListDelegate<ListItem>,
                                                               SDK.IsolateManager.Observer {
  readonly items: UI.ListModel.ListModel<ListItem>;
  list: UI.ListControl.ListControl<ListItem>;
  readonly itemByIsolate: Map<SDK.IsolateManager.Isolate, ListItem>;
  readonly totalElement: HTMLDivElement;
  totalValueDiv: HTMLElement;
  readonly totalTrendDiv: HTMLElement;

  constructor() {
    super();

    this.items = new UI.ListModel.ListModel();
    this.list = new UI.ListControl.ListControl(this.items, this, UI.ListControl.ListMode.NonViewport);
    this.list.element.classList.add('javascript-vm-instances-list');
    UI.ARIAUtils.setLabel(this.list.element, i18nString(UIStrings.javascriptVmInstances));
    this.contentElement.appendChild(this.list.element);

    this.itemByIsolate = new Map();

    this.totalElement = document.createElement('div');
    this.totalElement.classList.add('profile-memory-usage-item');
    this.totalElement.classList.add('hbox');
    this.totalValueDiv = this.totalElement.createChild('div', 'profile-memory-usage-item-size');
    this.totalTrendDiv = this.totalElement.createChild('div', 'profile-memory-usage-item-trend');
    this.totalElement.createChild('div').textContent = i18nString(UIStrings.totalJsHeapSize);
    const trendIntervalMinutes = Math.round(SDK.IsolateManager.MemoryTrendWindowMs / 60e3);
    UI.Tooltip.Tooltip.install(
        this.totalTrendDiv, i18nString(UIStrings.totalPageJsHeapSizeChangeTrend, {PH1: trendIntervalMinutes}));
    UI.Tooltip.Tooltip.install(this.totalValueDiv, i18nString(UIStrings.totalPageJsHeapSizeAcrossAllVm));

    SDK.IsolateManager.IsolateManager.instance().observeIsolates(this);
    SDK.TargetManager.TargetManager.instance().addEventListener(
        SDK.TargetManager.Events.NAME_CHANGED, this.targetChanged, this);
    SDK.TargetManager.TargetManager.instance().addEventListener(
        SDK.TargetManager.Events.INSPECTED_URL_CHANGED, this.targetChanged, this);
  }

  override wasShown(): void {
    super.wasShown();
    SDK.IsolateManager.IsolateManager.instance().addEventListener(
        SDK.IsolateManager.Events.MEMORY_CHANGED, this.heapStatsChanged, this);
  }

  override willHide(): void {
    super.willHide();
    SDK.IsolateManager.IsolateManager.instance().removeEventListener(
        SDK.IsolateManager.Events.MEMORY_CHANGED, this.heapStatsChanged, this);
  }

  isolateAdded(isolate: SDK.IsolateManager.Isolate): void {
    this.list.element.tabIndex = 0;
    const item = new ListItem(isolate);
    // Insert the primary page target at the top of the list.
    const index = (item.model() as SDK.RuntimeModel.RuntimeModel).target() ===
            SDK.TargetManager.TargetManager.instance().primaryPageTarget() ?
        0 :
        this.items.length;
    this.items.insert(index, item);
    this.itemByIsolate.set(isolate, item);
    // Select the first item by default.
    if (index === 0) {
      this.list.selectItem(item);
    }
    this.update();
  }

  isolateChanged(isolate: SDK.IsolateManager.Isolate): void {
    const item = this.itemByIsolate.get(isolate);
    if (item) {
      item.updateTitle();
    }
    this.update();
  }

  isolateRemoved(isolate: SDK.IsolateManager.Isolate): void {
    const item = this.itemByIsolate.get(isolate);
    if (item) {
      this.items.remove(this.items.indexOf(item));
    }
    this.itemByIsolate.delete(isolate);
    if (this.items.length === 0) {
      this.list.element.tabIndex = -1;
    }
    this.update();
  }

  targetChanged(event: Common.EventTarget.EventTargetEvent<SDK.Target.Target>): void {
    const target = event.data;
    const model = target.model(SDK.RuntimeModel.RuntimeModel);
    if (!model) {
      return;
    }
    const isolate = SDK.IsolateManager.IsolateManager.instance().isolateByModel(model);
    const item = isolate && this.itemByIsolate.get(isolate);
    if (item) {
      item.updateTitle();
    }
  }

  heapStatsChanged(event: Common.EventTarget.EventTargetEvent<SDK.IsolateManager.Isolate>): void {
    const isolate = event.data;
    const listItem = this.itemByIsolate.get(isolate);
    if (listItem) {
      listItem.updateStats();
    }
    this.updateTotal();
  }

  updateTotal(): void {
    let total = 0;
    let trend = 0;
    for (const isolate of SDK.IsolateManager.IsolateManager.instance().isolates()) {
      total += isolate.usedHeapSize();
      trend += isolate.usedHeapSizeGrowRate();
    }
    this.totalValueDiv.textContent = i18n.ByteUtilities.bytesToString(total);
    IsolateSelector.formatTrendElement(trend, this.totalTrendDiv);
  }

  static formatTrendElement(trendValueMs: number, element: Element): void {
    const changeRateBytesPerSecond = trendValueMs * 1e3;
    const changeRateThresholdBytesPerSecond = 1000;
    if (Math.abs(changeRateBytesPerSecond) < changeRateThresholdBytesPerSecond) {
      return;
    }
    const changeRateText = i18n.ByteUtilities.bytesToString(Math.abs(changeRateBytesPerSecond));
    let changeText, changeLabel;
    if (changeRateBytesPerSecond > 0) {
      changeText = '\u2B06' + i18nString(UIStrings.changeRate, {PH1: changeRateText});
      element.classList.toggle('increasing', true);
      changeLabel = i18nString(UIStrings.increasingBySPerSecond, {PH1: changeRateText});
    } else {
      changeText = '\u2B07' + i18nString(UIStrings.changeRate, {PH1: changeRateText});
      element.classList.toggle('increasing', false);
      changeLabel = i18nString(UIStrings.decreasingBySPerSecond, {PH1: changeRateText});
    }
    element.textContent = changeText;
    UI.ARIAUtils.setLabel(element, changeLabel);
  }

  totalMemoryElement(): Element {
    return this.totalElement;
  }

  createElementForItem(item: ListItem): Element {
    return item.element;
  }

  heightForItem(_item: ListItem): number {
    console.assert(false, 'should not be called');
    return 0;
  }

  updateSelectedItemARIA(_fromElement: Element|null, _toElement: Element|null): boolean {
    return false;
  }

  isItemSelectable(_item: ListItem): boolean {
    return true;
  }

  selectedItemChanged(_from: ListItem|null, to: ListItem|null, fromElement: Element|null, toElement: Element|null):
      void {
    if (fromElement) {
      fromElement.classList.remove('selected');
    }
    if (toElement) {
      toElement.classList.add('selected');
    }
    const model = to?.model();
    UI.Context.Context.instance().setFlavor(
        SDK.HeapProfilerModel.HeapProfilerModel, model?.heapProfilerModel() ?? null);
    UI.Context.Context.instance().setFlavor(
        SDK.CPUProfilerModel.CPUProfilerModel, model?.target().model(SDK.CPUProfilerModel.CPUProfilerModel) ?? null);
  }

  update(): void {
    this.updateTotal();
    this.list.invalidateRange(0, this.items.length);
  }
}

export class ListItem {
  isolate: SDK.IsolateManager.Isolate;
  element: HTMLDivElement;
  heapDiv: HTMLElement;
  readonly trendDiv: HTMLElement;
  readonly nameDiv: HTMLElement;

  constructor(isolate: SDK.IsolateManager.Isolate) {
    this.isolate = isolate;
    const trendIntervalMinutes = Math.round(SDK.IsolateManager.MemoryTrendWindowMs / 60e3);
    this.element = document.createElement('div');
    this.element.classList.add('profile-memory-usage-item');
    this.element.classList.add('hbox');
    UI.ARIAUtils.markAsOption(this.element);
    this.heapDiv = this.element.createChild('div', 'profile-memory-usage-item-size');
    UI.Tooltip.Tooltip.install(this.heapDiv, i18nString(UIStrings.heapSizeInUseByLiveJsObjects));
    this.trendDiv = this.element.createChild('div', 'profile-memory-usage-item-trend');
    UI.Tooltip.Tooltip.install(
        this.trendDiv, i18nString(UIStrings.heapSizeChangeTrendOverTheLastS, {PH1: trendIntervalMinutes}));
    this.nameDiv = this.element.createChild('div', 'profile-memory-usage-item-name');
    this.updateTitle();
  }

  model(): SDK.RuntimeModel.RuntimeModel|null {
    return this.isolate.runtimeModel();
  }

  updateStats(): void {
    this.heapDiv.textContent = i18n.ByteUtilities.bytesToString(this.isolate.usedHeapSize());
    IsolateSelector.formatTrendElement(this.isolate.usedHeapSizeGrowRate(), this.trendDiv);
  }

  updateTitle(): void {
    const modelCountByName = new Map<string, number>();
    const targetManager = SDK.TargetManager.TargetManager.instance();
    for (const model of this.isolate.models()) {
      const target = model.target();
      const isPrimaryPageTarget = targetManager.primaryPageTarget() === target;
      const name = target.name();
      const parsedURL = new Common.ParsedURL.ParsedURL(target.inspectedURL());
      const domain = parsedURL.isValid ? parsedURL.domain() : '';
      // If it is primary page target, omit `domain` in the title.
      // Otherwise show its `domain` and `name` as title if available.
      const title = target.decorateLabel(
          domain && !isPrimaryPageTarget ? `${domain}: ${name}` : name || domain || i18nString(UIStrings.empty));
      modelCountByName.set(title, (modelCountByName.get(title) || 0) + 1);
    }
    this.nameDiv.removeChildren();
    const titles = [];
    for (const [name, count] of modelCountByName) {
      const title = count > 1 ? `${name} (${count})` : name;
      titles.push(title);
      const titleDiv = this.nameDiv.createChild('div');
      titleDiv.textContent = title;
      UI.Tooltip.Tooltip.install(titleDiv, String(title));
    }
  }
}