/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

"use strict";

const {Services} = ChromeUtils.import("resource://gre/modules/Services.jsm");

ChromeUtils.defineModuleGetter(this, "NormandyApi", "resource://normandy/lib/NormandyApi.jsm");
ChromeUtils.defineModuleGetter(
  this,
  "ClientEnvironmentBase",
  "resource://gre/modules/components-utils/ClientEnvironment.jsm"
);
ChromeUtils.defineModuleGetter(
    this,
    "PreferenceExperiments",
    "resource://normandy/lib/PreferenceExperiments.jsm"
);

const {generateUUID} = Cc["@mozilla.org/uuid-generator;1"].getService(Ci.nsIUUIDGenerator);

var EXPORTED_SYMBOLS = ["ClientEnvironment"];

// Cached API request for client attributes that are determined by the Normandy
// service.
let _classifyRequest = null;


class ClientEnvironment extends ClientEnvironmentBase {
  /**
   * Fetches information about the client that is calculated on the server,
   * like geolocation and the current time.
   *
   * The server request is made lazily and is cached for the entire browser
   * session.
   */
  static async getClientClassification() {
    if (!_classifyRequest) {
      _classifyRequest = NormandyApi.classifyClient();
    }
    return _classifyRequest;
  }

  static clearClassifyCache() {
    _classifyRequest = null;
  }

  /**
   * Test wrapper that mocks the server request for classifying the client.
   * @param  {Object}   data          Fake server data to use
   * @param  {Function} testFunction  Test function to execute while mock data is in effect.
   */
  static withMockClassify(data, testFunction) {
    return async function inner() {
      const oldRequest = _classifyRequest;
      _classifyRequest = Promise.resolve(data);
      await testFunction();
      _classifyRequest = oldRequest;
    };
  }

  static get userId() {
    let id = Services.prefs.getCharPref("app.normandy.user_id", "");
    if (!id) {
      // generateUUID adds leading and trailing "{" and "}". strip them off.
      id = generateUUID().toString().slice(1, -1);
      Services.prefs.setCharPref("app.normandy.user_id", id);
    }
    return id;
  }

  static get country() {
    return (async () => {
      const { country } = await ClientEnvironment.getClientClassification();
      return country;
    })();
  }

  static get request_time() {
    return (async () => {
      const { request_time } = await ClientEnvironment.getClientClassification();
      return request_time;
    })();
  }

  static get experiments() {
    return (async () => {
      const names = {all: [], active: [], expired: []};

      for (const experiment of await PreferenceExperiments.getAll()) {
        names.all.push(experiment.name);
        if (experiment.expired) {
          names.expired.push(experiment.name);
        } else {
          names.active.push(experiment.name);
        }
      }

      return names;
    })();
  }

  static get isFirstRun() {
    return Services.prefs.getBoolPref("app.normandy.first_run", true);
  }
}