// Copyright (c) 2021 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import * as i18n from '../i18n/i18n.js';
import * as SDK from '../sdk/sdk.js';
import * as UI from '../ui/ui.js';

export const UIStrings = {
  /**
  *@description Text in Indexed DBViews of the Application panel
  */
  version: 'Version',
  /**
  *@description Table heading for Service Workers update information. Update is a noun.
  */
  updateActivity: 'Update Activity',
  /**
  *@description Title for the timeline tab.
  */
  timeline: 'Timeline',
  /**
  *@description Text in Service Workers Update Life Cycle
  *@example {2} PH1
  */
  startTimeS: 'Start time: {PH1}',
  /**
  *@description Text for end time of an event
  *@example {2} PH1
  */
  endTimeS: 'End time: {PH1}',
};
const str_ = i18n.i18n.registerUIStrings('resources/ServiceWorkerUpdateCycleHelper.ts', UIStrings);
const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);
export class ServiceWorkerUpdateCycleHelper {
  static calculateServiceWorkerUpdateRanges(registration: SDK.ServiceWorkerManager.ServiceWorkerRegistration):
      Array<ServiceWorkerUpdateRange> {
    function addRange(ranges: Array<ServiceWorkerUpdateRange>, range: ServiceWorkerUpdateRange): void {
      if (range.start < Number.MAX_VALUE && range.start <= range.end) {
        ranges.push(range);
      }
    }

    /**
     * Add ranges representing Install, Wait or Activate of a sw version represented by id.
     */
    function addNormalizedRanges(
        ranges: Array<ServiceWorkerUpdateRange>, id: string, startInstallTime: number, endInstallTime: number,
        startActivateTime: number, endActivateTime: number,
        status: Protocol.ServiceWorker.ServiceWorkerVersionStatus): void {
      addRange(ranges, {id, phase: ServiceWorkerUpdateNames.Install, start: startInstallTime, end: endInstallTime});
      if (status === Protocol.ServiceWorker.ServiceWorkerVersionStatus.Activating ||
          status === Protocol.ServiceWorker.ServiceWorkerVersionStatus.Activated ||
          status === Protocol.ServiceWorker.ServiceWorkerVersionStatus.Redundant) {
        addRange(ranges, {
          id,
          phase: ServiceWorkerUpdateNames.Wait,
          start: endInstallTime,
          end: startActivateTime,
        });
        addRange(
            ranges, {id, phase: ServiceWorkerUpdateNames.Activate, start: startActivateTime, end: endActivateTime});
      }
    }

    function rangesForVersion(version: SDK.ServiceWorkerManager.ServiceWorkerVersion): Array<ServiceWorkerUpdateRange> {
      let state: SDK.ServiceWorkerManager.ServiceWorkerVersionState|null = version.currentState;
      let endActivateTime: number = 0;
      let beginActivateTime: number = 0;
      let endInstallTime: number = 0;
      let beginInstallTime: number = 0;
      const currentStatus = state.status;
      if (currentStatus === Protocol.ServiceWorker.ServiceWorkerVersionStatus.New) {
        return [];
      }

      while (state) {
        // find the earliest timestamp of different stage on record.
        if (state.status === Protocol.ServiceWorker.ServiceWorkerVersionStatus.Activated) {
          endActivateTime = state.last_updated_timestamp;
        } else if (state.status === Protocol.ServiceWorker.ServiceWorkerVersionStatus.Activating) {
          if (endActivateTime === 0) {
            endActivateTime = state.last_updated_timestamp;
          }
          beginActivateTime = state.last_updated_timestamp;
        } else if (state.status === Protocol.ServiceWorker.ServiceWorkerVersionStatus.Installed) {
          endInstallTime = state.last_updated_timestamp;
        } else if (state.status === Protocol.ServiceWorker.ServiceWorkerVersionStatus.Installing) {
          if (endInstallTime === 0) {
            endInstallTime = state.last_updated_timestamp;
          }
          beginInstallTime = state.last_updated_timestamp;
        }
        state = state.previousState;
      }
      /** @type {Array <ServiceWorkerUpdateRange>} */
      const ranges: Array<ServiceWorkerUpdateRange> = [];
      addNormalizedRanges(
          ranges, version.id, beginInstallTime, endInstallTime, beginActivateTime, endActivateTime, currentStatus);
      return ranges;
    }

    const versions = registration.versionsByMode();
    const modes = [
      SDK.ServiceWorkerManager.ServiceWorkerVersion.Modes.Active,
      SDK.ServiceWorkerManager.ServiceWorkerVersion.Modes.Waiting,
      SDK.ServiceWorkerManager.ServiceWorkerVersion.Modes.Installing,
      SDK.ServiceWorkerManager.ServiceWorkerVersion.Modes.Redundant,
    ];

    for (const mode of modes) {
      const version = versions.get(mode);
      if (version) {
        const ranges = rangesForVersion(version);
        return ranges;
      }
    }

    return [];
  }

  static createTimingTable(registration: SDK.ServiceWorkerManager.ServiceWorkerRegistration): Element {
    const tableElement = document.createElement('table');
    tableElement.classList.add('service-worker-update-timing-table');
    UI.Utils.appendStyle(tableElement, 'resources/serviceWorkerUpdateCycleView.css');
    const timeRanges = this.calculateServiceWorkerUpdateRanges(registration);
    this.updateTimingTable(tableElement, timeRanges);
    return tableElement;
  }

  private static createTimingTableHead(tableElement: Element): void {
    const serverHeader = tableElement.createChild('tr', 'service-worker-update-timing-table-header');
    UI.UIUtils.createTextChild(serverHeader.createChild('td'), i18nString(UIStrings.version));
    UI.UIUtils.createTextChild(serverHeader.createChild('td'), i18nString(UIStrings.updateActivity));
    UI.UIUtils.createTextChild(serverHeader.createChild('td'), i18nString(UIStrings.timeline));
  }

  private static removeRows(tableElement: Element): void {
    const rows = tableElement.getElementsByTagName('tr');
    while (rows[0]) {
      if (rows[0].parentNode) {
        rows[0].parentNode.removeChild(rows[0]);
      }
    }
  }

  private static updateTimingTable(tableElement: Element, timeRanges: Array<ServiceWorkerUpdateRange>): void {
    this.removeRows(tableElement);
    this.createTimingTableHead(tableElement);
    /** @type {!Array<ServiceWorkerUpdateRange>} */
    const timeRangeArray = timeRanges;
    if (timeRangeArray.length === 0) {
      return;
    }

    const startTimes = timeRangeArray.map(r => r.start);
    const endTimes = timeRangeArray.map(r => r.end);
    const startTime = startTimes.reduce((a, b) => Math.min(a, b));
    const endTime = endTimes.reduce((a, b) => Math.max(a, b));
    const scale = 100 / (endTime - startTime);

    for (const range of timeRangeArray) {
      const phaseName = range.phase;

      const left = (scale * (range.start - startTime));
      const right = (scale * (endTime - range.end));

      const tr = tableElement.createChild('tr');
      const timingBarVersionElement = tr.createChild('td');
      UI.UIUtils.createTextChild(timingBarVersionElement, '#' + range.id);
      timingBarVersionElement.classList.add('service-worker-update-timing-bar-clickable');
      timingBarVersionElement.setAttribute('tabindex', '0');
      timingBarVersionElement.setAttribute('role', 'switch');
      UI.ARIAUtils.setChecked(timingBarVersionElement, false);
      const timingBarTitleElement = tr.createChild('td');
      UI.UIUtils.createTextChild(timingBarTitleElement, phaseName);
      this.constructUpdateDetails(tableElement, tr, range);
      const barContainer = tr.createChild('td').createChild('div', 'service-worker-update-timing-row');
      const bar = <HTMLElement>(
          barContainer.createChild('span', 'service-worker-update-timing-bar ' + phaseName.toLowerCase()));

      bar.style.left = left + '%';
      bar.style.right = right + '%';
      bar.textContent = '\u200B';  // Important for 0-time items to have 0 width.
    }
  }

  /**
   * Detailed information about an update phase. Currently starting and ending time.
   */
  private static constructUpdateDetails(tableElement: Element, tr: Element, range: ServiceWorkerUpdateRange): void {
    const detailsElement = tableElement.createChild('tr', 'service-worker-update-timing-bar-details');
    detailsElement.classList.add('service-worker-update-timing-bar-details-collapsed');

    self.onInvokeElement(tr, event => this.onToggleUpdateDetails(detailsElement, event));

    const detailsView = new UI.TreeOutline.TreeOutlineInShadow();
    detailsElement.appendChild(detailsView.element);

    const startTimeItem = document.createElementWithClass('div', 'service-worker-update-details-treeitem');
    const startTime = (new Date(range.start)).toISOString();
    startTimeItem.textContent = i18nString(UIStrings.startTimeS, {PH1: startTime});

    const startTimeTreeElement = new UI.TreeOutline.TreeElement(startTimeItem);
    detailsView.appendChild(startTimeTreeElement);

    const endTimeItem = document.createElementWithClass('div', 'service-worker-update-details-treeitem');
    const endTime = (new Date(range.end)).toISOString();
    endTimeItem.textContent = i18nString(UIStrings.endTimeS, {PH1: endTime});

    const endTimeTreeElement = new UI.TreeOutline.TreeElement(endTimeItem);
    detailsView.appendChild(endTimeTreeElement);
  }

  private static onToggleUpdateDetails(detailsRow: Element, event: Event): void {
    if (!event.target) {
      return;
    }
    const target: Element = <Element>(event.target);
    if (target.classList.contains('service-worker-update-timing-bar-clickable')) {
      detailsRow.classList.toggle('service-worker-update-timing-bar-details-collapsed');
      detailsRow.classList.toggle('service-worker-update-timing-bar-details-expanded');

      const expanded = target.getAttribute('aria-checked') === 'true';
      UI.ARIAUtils.setChecked(target, !expanded);
    }
  }

  static refresh(tableElement: Element, registration: SDK.ServiceWorkerManager.ServiceWorkerRegistration): void {
    const timeRanges = this.calculateServiceWorkerUpdateRanges(registration);
    this.updateTimingTable(tableElement, timeRanges);
  }
}

export const enum ServiceWorkerUpdateNames {
  Install = 'Install',
  Wait = 'Wait',
  Activate = 'Activate',
}


export interface ServiceWorkerUpdateRange {
  id: string;
  phase: ServiceWorkerUpdateNames;
  start: number;
  end: number;
}