// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import '../../ui/components/highlighting/highlighting.js';

import * as Common from '../../core/common/common.js';
import * as i18n from '../../core/i18n/i18n.js';
import type * as Platform from '../../core/platform/platform.js';
import * as Workspace from '../../models/workspace/workspace.js';
import * as DataGrid from '../../ui/legacy/components/data_grid/data_grid.js';
import * as UI from '../../ui/legacy/legacy.js';
import {Directives, html, nothing, render, type TemplateResult} from '../../ui/lit/lit.js';

import coverageListViewStyles from './coverageListView.css.js';
import {CoverageType} from './CoverageModel.js';

const {ifExpanded} = DataGrid;

export interface CoverageListItem {
  url: Platform.DevToolsPath.UrlString;
  type: CoverageType;
  size: number;
  usedSize: number;
  unusedSize: number;
  usedPercentage: number;
  unusedPercentage: number;
  sources: CoverageListItem[];
  isContentScript: boolean;
  generatedUrl?: Platform.DevToolsPath.UrlString;
}

const UIStrings = {
  /**
   * @description Text that appears on a button for the css resource type filter.
   */
  css: 'CSS',
  /**
   * @description Text in Coverage List View of the Coverage tab
   */
  jsPerFunction: 'JS (per function)',
  /**
   * @description Text in Coverage List View of the Coverage tab
   */
  jsPerBlock: 'JS (per block)',
  /**
   * @description Text for web URLs
   */
  url: 'URL',
  /**
   * @description Text that refers to some types
   */
  type: 'Type',
  /**
   * @description Text in Coverage List View of the Coverage tab
   */
  totalBytes: 'Total Bytes',
  /**
   * @description Text in Coverage List View of the Coverage tab
   */
  unusedBytes: 'Unused Bytes',
  /**
   * @description Text in the Coverage List View of the Coverage Tab
   */
  usageVisualization: 'Usage Visualization',
  /**
   * @description Data grid name for Coverage data grids
   */
  codeCoverage: 'Code Coverage',
  /**
   * @description Cell title in Coverage List View of the Coverage tab. The coverage tool tells
   *developers which functions (logical groups of lines of code) were actually run/executed. If a
   *function does get run, then it is marked in the UI to indicate that it was covered.
   */
  jsCoverageWithPerFunction:
      'JS coverage with per function granularity: Once a function was executed, the whole function is marked as covered.',
  /**
   * @description Cell title in Coverage List View of the Coverage tab. The coverage tool tells
   *developers which blocks (logical groups of lines of code, smaller than a function) were actually
   *run/executed. If a block does get run, then it is marked in the UI to indicate that it was
   *covered.
   */
  jsCoverageWithPerBlock:
      'JS coverage with per block granularity: Once a block of JavaScript was executed, that block is marked as covered.',
  /**
   * @description Accessible text for the value in bytes in memory allocation or coverage view.
   */
  sBytes: '{n, plural, =1 {# byte} other {# bytes}}',
  /**
   * @description Accessible text for the unused bytes column in the coverage tool that describes the total unused bytes and percentage of the file unused.
   * @example {88%} percentage
   */
  sBytesS: '{n, plural, =1 {# byte, {percentage}} other {# bytes, {percentage}}}',
  /**
   * @description Tooltip text for the bar in the coverage list view of the coverage tool that illustrates the relation between used and unused bytes.
   * @example {1000} PH1
   * @example {12.34} PH2
   */
  sBytesSBelongToFunctionsThatHave: '{PH1} bytes ({PH2}) belong to functions that have not (yet) been executed.',
  /**
   * @description Tooltip text for the bar in the coverage list view of the coverage tool that illustrates the relation between used and unused bytes.
   * @example {1000} PH1
   * @example {12.34} PH2
   */
  sBytesSBelongToBlocksOf: '{PH1} bytes ({PH2}) belong to blocks of JavaScript that have not (yet) been executed.',
  /**
   * @description Message in Coverage View of the Coverage tab
   * @example {1000} PH1
   * @example {12.34} PH2
   */
  sBytesSBelongToFunctionsThatHaveExecuted: '{PH1} bytes ({PH2}) belong to functions that have executed at least once.',
  /**
   * @description Message in Coverage View of the Coverage tab
   * @example {1000} PH1
   * @example {12.34} PH2
   */
  sBytesSBelongToBlocksOfJavascript:
      '{PH1} bytes ({PH2}) belong to blocks of JavaScript that have executed at least once.',
  /**
   * @description Accessible text for the visualization column of coverage tool. Contains percentage of unused bytes to used bytes.
   * @example {12.3} PH1
   * @example {12.3} PH2
   */
  sOfFileUnusedSOfFileUsed: '{PH1} % of file unused, {PH2} % of file used',
} as const;
const str_ = i18n.i18n.registerUIStrings('panels/coverage/CoverageListView.ts', UIStrings);
const i18nString = i18n.i18n.getLocalizedString.bind(undefined, str_);
const {styleMap, repeat} = Directives;

export function coverageTypeToString(type: CoverageType): string {
  const types = [];
  if (type & CoverageType.CSS) {
    types.push(i18nString(UIStrings.css));
  }
  if (type & CoverageType.JAVA_SCRIPT_PER_FUNCTION) {
    types.push(i18nString(UIStrings.jsPerFunction));
  } else if (type & CoverageType.JAVA_SCRIPT) {
    types.push(i18nString(UIStrings.jsPerBlock));
  }
  return types.join('+');
}

interface ViewInput {
  items: CoverageListItem[];
  selectedUrl: Platform.DevToolsPath.UrlString|null;
  maxSize: number;
  onOpen: (url: Platform.DevToolsPath.UrlString) => void;
  onExpand: () => void;
  onCollapse: () => void;
  highlightRegExp: RegExp|null;
  expandedUrls: Set<Platform.DevToolsPath.UrlString>;
}

type View = (input: ViewInput, output: object, target: HTMLElement) => void;

const formatBytes = (value: number|undefined): string => {
  return getBytesFormatter().format(value ?? 0);
};
const formatPercent = (value: number|undefined): string => {
  return getPercentageFormatter().format(value ?? 0);
};
export const DEFAULT_VIEW: View = (input, _output, target) => {
  // clang-format off
  render(html`
    <style>${coverageListViewStyles}</style>
    <devtools-data-grid class="flex-auto" name=${i18nString(UIStrings.codeCoverage)} striped autofocus resize="last"
      .template=${html`
        <table>
          <tr>
            <th id="url" width="250px" weight="3" sortable>${i18nString(UIStrings.url)}</th>
            <th id="type" width="45px" weight="1" fixed sortable>${i18nString(UIStrings.type)}</th>
            <th id="size" width="60px" align="right" weight="1" fixed sortable>${i18nString(UIStrings.totalBytes)}</th>
            <th id="unused-size" width="100px" align="right" weight="1" fixed sortable sort="descending">${
                i18nString(UIStrings.unusedBytes)}</th>
            <th id="bars" width="250px" weight="1" sortable>${i18nString(UIStrings.usageVisualization)}</th>
          </tr>
          ${repeat(input.items, info => info.url, info => renderItem(info, input))}
        </table>`}>
      </devtools-data-grid>`,
      target);
  // clang-format on
};

export class CoverageListView extends UI.Widget.VBox {
  #highlightRegExp: RegExp|null;
  #coverageInfo: CoverageListItem[] = [];
  #selectedUrl: Platform.DevToolsPath.UrlString|null = null;
  #maxSize = 0;
  #expandedUrls = new Set<Platform.DevToolsPath.UrlString>();
  #view: View;

  constructor(element?: HTMLElement, view = DEFAULT_VIEW) {
    super(element, {useShadowDom: true, delegatesFocus: true});
    this.#view = view;
    this.#highlightRegExp = null;
  }

  set highlightRegExp(highlightRegExp: RegExp|null) {
    this.#highlightRegExp = highlightRegExp;
    this.requestUpdate();
  }

  get highlightRegExp(): RegExp|null {
    return this.#highlightRegExp;
  }

  set coverageInfo(coverageInfo: CoverageListItem[]) {
    this.#coverageInfo = coverageInfo;
    this.#maxSize = coverageInfo.reduce((acc, entry) => Math.max(acc, entry.size), 0);
    this.requestUpdate();
  }

  get coverageInfo(): CoverageListItem[] {
    return this.#coverageInfo;
  }

  override performUpdate(): void {
    const input: ViewInput = {
      items: this.#coverageInfo,
      selectedUrl: this.#selectedUrl,
      maxSize: this.#maxSize,
      expandedUrls: this.#expandedUrls,
      onOpen: (url: Platform.DevToolsPath.UrlString) => {
        this.selectedUrl = url;
      },
      onExpand: () => {
        this.requestUpdate();
      },
      onCollapse: () => {
        this.requestUpdate();
      },
      highlightRegExp: this.#highlightRegExp,
    };
    this.#view(input, {}, this.contentElement);
  }

  reset(): void {
    this.#coverageInfo = [];
    this.#maxSize = 0;
    this.requestUpdate();
  }

  set selectedUrl(url: Platform.DevToolsPath.UrlString|null) {
    const info = this.#coverageInfo.find(info => info.url === url);
    if (!info) {
      return;
    }
    if (this.#selectedUrl !== url) {
      this.#selectedUrl = url as Platform.DevToolsPath.UrlString;
      this.requestUpdate();
    }
    const sourceCode = url ? Workspace.Workspace.WorkspaceImpl.instance().uiSourceCodeForURL(url) : null;
    if (!sourceCode) {
      return;
    }

    void Common.Revealer.reveal(sourceCode);
  }

  get selectedUrl(): Platform.DevToolsPath.UrlString|null {
    return this.#selectedUrl;
  }
}

let percentageFormatter: Intl.NumberFormat|null = null;

function getPercentageFormatter(): Intl.NumberFormat {
  if (!percentageFormatter) {
    percentageFormatter = new Intl.NumberFormat(i18n.DevToolsLocale.DevToolsLocale.instance().locale, {
      style: 'percent',
      maximumFractionDigits: 1,
    });
  }
  return percentageFormatter;
}

let bytesFormatter: Intl.NumberFormat|null = null;

function getBytesFormatter(): Intl.NumberFormat {
  if (!bytesFormatter) {
    bytesFormatter = new Intl.NumberFormat(i18n.DevToolsLocale.DevToolsLocale.instance().locale);
  }
  return bytesFormatter;
}

function renderItem(info: CoverageListItem, input: ViewInput): TemplateResult {
  function highlightRange(textContent: string): string {
    const matches = input.highlightRegExp?.exec(textContent);
    return matches?.length ? `${matches.index},${matches[0].length}` : '';
  }

  const splitURL = /^(.*)(\/[^/]*)$/.exec(info.url);
  // clang-format off
  return html`
    <style>${coverageListViewStyles}</style>
    <tr data-url=${info.url} selected=${info.url === input.selectedUrl}
        @open=${() => input.onOpen(info.url)}
        @expand=${() => input.onExpand()}
        @collapse=${() => input.onCollapse()}>
      <td data-value=${info.url} title=${info.url} aria-label=${info.url}>
        <devtools-highlight ranges=${highlightRange(info.url)} class="url-outer" aria-hidden="true">
          <div class="url-prefix">${splitURL ? splitURL[1] : info.url}</div>
          <div class="url-suffix">${splitURL ? splitURL[2] : ''}</div>
        </devtools-highlight>
      </td>
      <td data-value=${coverageTypeToString(info.type)}
          title=${info.type & CoverageType.JAVA_SCRIPT_PER_FUNCTION ? i18nString(UIStrings.jsCoverageWithPerFunction) :
                      info.type & CoverageType.JAVA_SCRIPT          ? i18nString(UIStrings.jsCoverageWithPerBlock) :
                                                                      ''}>
        ${coverageTypeToString(info.type)}
      </td>
      <td data-value=${info.size} aria-label=${i18nString(UIStrings.sBytes, {n: info.size || 0})}>
        <span>${formatBytes(info.size)}</span>
      </td>
      <td data-value=${info.unusedSize} aria-label=${i18nString(UIStrings.sBytesS, {n: info.unusedSize, percentage: formatPercent(info.unusedPercentage)})}>
        <span>${formatBytes(info.unusedSize)}</span>
        <span class="percent-value">
          ${formatPercent(info.unusedPercentage)}
        </span>
      </td>
      <td data-value=${info.unusedSize} aria-label=${i18nString(UIStrings.sOfFileUnusedSOfFileUsed, {PH1: formatPercent(info.unusedPercentage), PH2: formatPercent(info.usedPercentage)})}>
        <div class="bar-container">
          ${info.unusedSize > 0 ? html`
            <div class="bar bar-unused-size"
                title=${
                  info.type & CoverageType.JAVA_SCRIPT_PER_FUNCTION ? i18nString(UIStrings.sBytesSBelongToFunctionsThatHave, {PH1: info.unusedSize, PH2: formatPercent(info.unusedPercentage)}) :
                  info.type & CoverageType.JAVA_SCRIPT              ? i18nString(UIStrings.sBytesSBelongToBlocksOf, {PH1: info.unusedSize, PH2: formatPercent(info.unusedPercentage)}) :
                                                                      ''}
                  style=${styleMap({width: ((info.unusedSize / input.maxSize) * 100 || 0) + '%'})}>
            </div>` : nothing}
          ${info.usedSize > 0 ? html`
            <div class="bar bar-used-size"
                  title=${
                    info.type & CoverageType.JAVA_SCRIPT_PER_FUNCTION ? i18nString(UIStrings.sBytesSBelongToFunctionsThatHaveExecuted, {PH1: info.usedSize, PH2: formatPercent(info.usedPercentage)}) :
                    info.type & CoverageType.JAVA_SCRIPT              ? i18nString(UIStrings.sBytesSBelongToBlocksOfJavascript, {PH1: info.usedSize, PH2: formatPercent(info.usedPercentage)}) :
                                                                        ''}
                style=${styleMap({width:((info.usedSize / input.maxSize) * 100 || 0) + '%'})}>
            </div>` : nothing}
        </div>
      </td>
      ${info.sources.length > 0 ? html`
        <td><table>
          ${ifExpanded(() => html`${repeat(info.sources, source => source.url, source => renderItem(source, input))}`)}
        </table></td>` : nothing}
    </tr>`;
  // clang-format on
}