/**
 * This test is used to make sure we won't show the sound indicator for silent
 * web audio.
 */
 /* eslint-disable mozilla/no-arbitrary-setTimeout */
"use strict";

function createAudioContext() {
  content.ac = new content.AudioContext();
  const ac = content.ac;
  const dest = ac.destination;
  const source = ac.createBufferSource();
  const buf = ac.createBuffer(1, 3 * ac.sampleRate, ac.sampleRate);
  const bufData = buf.getChannelData(0);
  for (let idx = 0; idx < buf.length; idx++) {
    bufData[idx] = 0.0;
  }
  source.buffer = buf;
  source.connect(dest);
  source.start();
}

async function waitUntilAudioContextStarts() {
  const ac = content.ac;
  if (ac.state == "running") {
   return;
  }

  await new Promise((resolve) => {
    ac.onstatechange = () => {
      if (ac.state == "running") {
        ac.onstatechange = null;
        resolve();
      }
    };
  });
}

add_task(async function testSilentAudioContext() {
  info(`- create new tab -`);
  const tab = await BrowserTestUtils.openNewForegroundTab(window.gBrowser,
                                                          "about:blank");
  const browser = tab.linkedBrowser;

  info(`- create audio context -`);
  // We want the same audio context to be used across different content
  // tasks, so it needs to be loaded by a frame script.
  const mm = tab.linkedBrowser.messageManager;
  mm.loadFrameScript("data:,(" + createAudioContext.toString() + ")();", false);

  info(`- check AudioContext's state -`);
  await ContentTask.spawn(browser, null, waitUntilAudioContextStarts);
  ok(true, `AudioContext is running.`);

  info(`- should not show sound indicator -`);
  // If we do the next step too early, then we can't make sure whether that the
  // reason of no showing sound indicator is because of silent web audio, or
  // because the indicator is just not showing yet.
  await new Promise(r => setTimeout(r, 1000));
  await waitForTabPlayingEvent(tab, false);

  info(`- remove tab -`);
  await BrowserTestUtils.removeTab(tab);
});