await this.lazyInit();

    const entries = [];
    // Retrieve all the scripts registered for the given extension ID by
    // enumerating all keys that are stored in a lexical order.
    const enumerator = await this._store.enumerate(
      `${extensionId}/`, // from_key (inclusive)
      `${extensionId}0` // to_key (exclusive)
    );

    while (enumerator.hasMoreElements()) {
      const { key, value } = enumerator.getNext();
      entries.push([key, JSON.parse(value)]);
    }

    return entries;
  }
}

const store = new Store();

/**
 * Given an extension and some content script options, this function returns
 * the content script representation we use internally, which is an object with
 * a `scriptId` and a nested object containing `options`. These (internal)
 * objects are shared with all content processes using IPC/sharedData.
 *
 * This function can optionally prepend the extension's base URL to the CSS and
 * JS paths, which is needed when we load internal scripts from the scripting
 * store (because the UUID in the base URL changes).
 *
 * @param {Extension} extension
 *        The extension that owns the content script.
 * @param {object} options
 *        Content script options.
 * @param {boolean} prependBaseURL
 *        Whether to prepend JS and CSS paths with the extension's base URL.
 *
 * @returns {object}
 */
export const makeInternalContentScript = (
  extension,
  options,
  prependBaseURL = false
) => {
  let cssPaths = options.css || [];
  let jsPaths = options.js || [];

  if (prependBaseURL) {
    cssPaths = cssPaths.map(css => `${extension.baseURL}${css}`);
    jsPaths = jsPaths.map(js => `${extension.baseURL}${js}`);
  }

  return {
    scriptId: ExtensionUtils.getUniqueId(),
    options: {
      // We need to store the user-supplied script ID for persisted scripts.
      id: options.id,
      allFrames: options.allFrames || false,
      // Although this flag defaults to true with MV3, it is not with MV2.
      // Check permissions at runtime since we aren't checking permissions
      // upfront.
      checkPermissions: true,
      cssPaths,
      cssOrigin: options.cssOrigin || "author",
      excludeMatches: options.excludeMatches,
      jsPaths,
      matches: options.matches,
      matchOriginAsFallback: options.matchOriginAsFallback || false,
      originAttributesPatterns: null,
      persistAcrossSessions: options.persistAcrossSessions,
      runAt: options.runAt || "document_idle",
      world: options.world || "ISOLATED",
    },
  };
};

/**
 * Given an internal content script registered with the "scripting" API (and an
 * extension), this function returns a new object that matches the public
 * "scripting" API.
 *
 * This function is primarily in `scripting.getRegisteredContentScripts()`.
 *
 * @param {Extension} extension
 *        The extension that owns the content script.
 * @param {object} internalScript
 *        An internal script (see also: `makeInternalContentScript()`).
 *
 * @returns {object}
 */
export const makePublicContentScript = (extension, internalScript) => {
  let script = {
    id: internalScript.id,
    allFrames: internalScript.allFrames,
    matches: internalScript.matches,
    matchOriginAsFallback: internalScript.matchOriginAsFallback,
    runAt: internalScript.runAt,
    world: internalScript.world,
    persistAcrossSessions: internalScript.persistAcrossSessions,
    cssOrigin: internalScript.cssOrigin,
  };

  if (internalScript.cssPaths.length) {
    script.css = internalScript.cssPaths.map(cssPath =>
      cssPath.replace(extension.baseURL, "")
    );
  }

  if (internalScript.excludeMatches?.length) {
    script.excludeMatches = internalScript.excludeMatches;
  }

  if (internalScript.jsPaths.length) {
    script.js = internalScript.jsPaths.map(jsPath =>
      jsPath.replace(extension.baseURL, "")
    );
  }

  return script;
};

export const ExtensionScriptingStore = {
  async initExtension(extension) {
    let scripts;

    // On downgrades/upgrades (and re-installation on top of an existing one),
    // we do clear any previously stored scripts and return earlier.
    switch (extension.startupReason) {
      case "ADDON_INSTALL":
      case "ADDON_UPGRADE":
      case "ADDON_DOWNGRADE":
        // On extension upgrades/downgrades the StartupCache data for the
        // extension would already be cleared, and so we set the hasPersistedScripts
        // flag here just to avoid having to check that (by loading the rkv store data)
        // on the next startup.
        StartupCache.general.set(
          [extension.id, extension.version, "scripting", "hasPersistedScripts"],
          false
        );
        store.deleteAll(extension.id);
        return;
    }

    const hasPersistedScripts = await StartupCache.get(
      extension,
      ["scripting", "hasPersistedScripts"],
      async () => {
        scripts = await store.getAll(extension.id);
        return !!scripts.length;
      }
    );

    if (!hasPersistedScripts) {
      return;
    }

    // Load the scripts from the storage, then convert them to their internal
    // representation and add them to the extension's registered scripts.
    scripts ??= await store.getAll(extension.id);

    scripts.forEach(script => {
      const { scriptId, options } = makeInternalContentScript(
        extension,
        script,
        true /* prepend the css/js paths with the extension base URL */
      );
      extension.registeredContentScripts.set(scriptId, options);
    });
  },

  getInitialScriptIdsMap(extension) {
    // This returns the current map of public script IDs to internal IDs.
    // `extension.registeredContentScripts` is initialized in `initExtension`,
    // which may be updated later via the scripting API. In practice, the map
    // of script IDs is retrieved before any scripting API method is exposed,
    // so the return value always matches the initial result from
    // `initExtension`.
    return new Map(
      Array.from(extension.registeredContentScripts.entries())
        .filter(
          // Filter out entries without an options.id property, which are the
          // ones registered through the contentScripts API namespace where the
          // id attribute is not allowed, while it is mandatory for the
          // scripting API namespace.
          ([_id, options]) => options.id?.length
        )
        .map(([scriptId, options]) => [options.id, scriptId])
    );
  },

  async persistAll(extension) {
    // We only persist the scripts that should be persisted and we convert each
    // script to their "public" representation before storing them. This is
    // because we don't want to deal with data migrations if we ever want to
    // change the internal representation (the "public" representation is less
    // likely to change because it is bound to the public scripting API).
    const scripts = Array.from(extension.registeredContentScripts.values())
      .filter(options => options.persistAcrossSessions)
      .map(options => makePublicContentScript(extension, options));

    // We want to replace all the scripts for the extension so we should delete
    // the existing ones first, and then write the new ones.
    //
    // TODO: Bug 1783131 - Implement individual updates without requiring all
    // data to be erased and written.
    await store.deleteAll(extension.id);
    await store.writeMany(extension.id, scripts);
    StartupCache.general.set(
      [extension.id, extension.version, "scripting", "hasPersistedScripts"],
      !!scripts.length
    );
  },

  // Delete all the persisted scripts for the given extension (id).
  //
  // NOTE: to be only used on addon uninstall, the extension entry in the StartupCache
  // is expected to also be fully cleared as part of handling the addon uninstall.
  async clearOnUninstall(extensionId) {
    await store.deleteAll(extensionId);
  },

  // As its name implies, don't use this method for anything but an easy access
  // to the internal store for testing purposes.
  _getStoreForTesting() {
    return store;
  },
};
PK