/**
 * @license
 * Copyright 2016 Google LLC
 * SPDX-License-Identifier: Apache-2.0
 */

import {Audit} from './audit.js';
import UrlUtils from '../lib/url-utils.js';
import {NetworkRequest} from '../lib/network-request.js';
import {NetworkRecords} from '../computed/network-records.js';
import * as i18n from '../lib/i18n/i18n.js';

const UIStrings = {
  /** Title of a Lighthouse audit that provides detail on the useage of HTTPS on a page. This descriptive title is shown to users when all requests on a page are fufilled using HTTPS. */
  title: 'Uses HTTPS',
  /** Title of a Lighthouse audit that provides detail on the useage of HTTPS on a page. This descriptive title is shown to users when some, or all, requests on the page use HTTP instead of HTTPS. */
  failureTitle: 'Does not use HTTPS',
  /** Description of a Lighthouse audit that tells the user *why* HTTPS use *for all resources* is important. This is displayed after a user expands the section to see more. No character length limits. The last sentence starting with 'Learn' becomes link text to additional documentation. */
  description: 'All sites should be protected with HTTPS, even ones that don\'t handle ' +
      'sensitive data. This includes avoiding [mixed content](https://developers.google.com/web/fundamentals/security/prevent-mixed-content/what-is-mixed-content), ' +
      'where some resources are loaded over HTTP despite the initial request being served ' +
      'over HTTPS. HTTPS prevents intruders from tampering with or passively listening ' +
      'in on the communications between your app and your users, and is a prerequisite for ' +
      'HTTP/2 and many new web platform APIs. ' +
      '[Learn more about HTTPS](https://developer.chrome.com/docs/lighthouse/pwa/is-on-https/).',
  /** [ICU Syntax] Label identifying the number of insecure network requests found by an audit of a web page. */
  displayValue: `{itemCount, plural,
    =1 {1 insecure request found}
    other {# insecure requests found}
    }`,
  /** Label for a column in a data table; entries in the column will be the URLs of insecure (non-HTTPS) network requests. */
  columnInsecureURL: 'Insecure URL',
  /** Label for a column in a data table; entries in the column will be how the browser handled insecure (non-HTTPS) network requests. */
  columnResolution: 'Request Resolution',
  /** Value for the resolution column in a data table; denotes that the insecure URL was allowed by the browser. */
  allowed: 'Allowed',
  /** Value for the resolution column in a data table; denotes that the insecure URL was blocked by the browser. */
  blocked: 'Blocked',
  /** Value for the resolution column in a data table; denotes that the insecure URL may be blocked by the browser in the future. */
  warning: 'Allowed with warning',
  /** Value for the resolution column in a data table; denotes that the insecure URL was upgraded to a secure request by the browser. */
  upgraded: 'Automatically upgraded to HTTPS',
};

const resolutionToString = {
  MixedContentAutomaticallyUpgraded: UIStrings.upgraded,
  MixedContentBlocked: UIStrings.blocked,
  MixedContentWarning: UIStrings.warning,
};

const str_ = i18n.createIcuMessageFn(import.meta.url, UIStrings);


class HTTPS extends Audit {
  /**
   * @return {LH.Audit.Meta}
   */
  static get meta() {
    return {
      id: 'is-on-https',
      title: str_(UIStrings.title),
      failureTitle: str_(UIStrings.failureTitle),
      description: str_(UIStrings.description),
      requiredArtifacts: ['DevtoolsLog', 'InspectorIssues'],
    };
  }

  /**
   * @param {LH.Artifacts} artifacts
   * @param {LH.Audit.Context} context
   * @return {Promise<LH.Audit.Product>}
   */
  static async audit(artifacts, context) {
    const devtoolsLogs = artifacts.DevtoolsLog;
    const networkRecords = await NetworkRecords.request(devtoolsLogs, context);
    const insecureURLs = networkRecords
      .filter(record => !NetworkRequest.isSecureRequest(record))
      .map(record => UrlUtils.elideDataURI(record.url));

    /** @type {Array<{url: string, resolution?: LH.IcuMessage|string}>}  */
    const items = Array.from(new Set(insecureURLs)).map(url => ({url, resolution: undefined}));

    /** @type {LH.Audit.Details.Table['headings']} */
    const headings = [
      {key: 'url', valueType: 'url', label: str_(UIStrings.columnInsecureURL)},
      {key: 'resolution', valueType: 'text', label: str_(UIStrings.columnResolution)},
    ];

    for (const details of artifacts.InspectorIssues.mixedContentIssue ?? []) {
      let item = items.find(item => item.url === details.insecureURL);
      if (!item) {
        item = {url: details.insecureURL};
        items.push(item);
      }
      item.resolution = resolutionToString[details.resolutionStatus] ?
        str_(resolutionToString[details.resolutionStatus]) :
        details.resolutionStatus;
    }

    // If a resolution wasn't assigned from an InspectorIssue, then the item
    // is not blocked by the browser but we've determined it is insecure anyhow.
    // For example, if the URL is localhost, all `http` requests are valid
    // (localhost is a secure context), but we still identify `http` requests
    // as an "Allowed" insecure URL.
    for (const item of items) {
      if (!item.resolution) item.resolution = str_(UIStrings.allowed);
    }

    let displayValue;
    if (items.length > 0) {
      displayValue = str_(UIStrings.displayValue, {itemCount: items.length});
    }

    return {
      score: Number(items.length === 0),
      displayValue,
      details: Audit.makeTableDetails(headings, items),
    };
  }
}

export default HTTPS;
export {UIStrings};