/* 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/. */

const fs = require("fs");
const path = require("path");
const { logTest } = require("./utils/profiling");

module.exports = logTest(
  "throttled pageload",
  async function (context, commands) {
    context.log.info(
      "Starting a pageload for which we will first enable the dev tools network throttler"
    );

    const url = "https://en.wikipedia.org/wiki/Barack_Obama";

    await commands.navigate("about:blank");
    await commands.wait.byTime(1000);

    // Load the throttling script
    let throttler_script = null;
    let throttlerScriptPath = path.join(
      `${path.resolve(__dirname)}`,
      "utils",
      "NetworkThrottlingUtils.js"
    );
    try {
      throttler_script = fs.readFileSync(throttlerScriptPath, "utf8");
    } catch (error) {
      throw Error(
        `Failed to load network throttler script ${throttlerScriptPath}`
      );
    }

    // Create a throttler and configure the network
    let usage = `
    let networkThrottler = new NetworkThrottler();
    let throttleData = {
      latencyMean: 50,
      latencyMax: 50,
      downloadBPSMean: 250000,
      downloadBPSMax: 250000,
      uploadBPSMean: 250000,
      uploadBPSMax: 250000
    };
    networkThrottler.start(throttleData);
  `;

    throttler_script += usage;
    commands.js.runPrivileged(throttler_script);

    await commands.measure.start(url);

    context.log.info("Throttled pageload test finished.");
    return true;
  }
);
