const PAGE = "https://example.com/browser/toolkit/content/tests/browser/file_multipleAudio.html";

function play_audio_from_invisible_tab() {
  return new Promise(resolve => {
    var autoPlay = content.document.getElementById("autoplay");
    if (!autoPlay) {
      ok(false, "Can't get the audio element!");
    }

    is(autoPlay.paused, true, "Audio in tab 1 was paused by audio competing.");
    autoPlay.play();
    autoPlay.onpause = function() {
      autoPlay.onpause = null;
      ok(true, "Audio in tab 1 can't playback when other tab is playing in foreground.");
      resolve();
    };
  });
}

function audio_should_keep_playing_even_go_to_background() {
  var autoPlay = content.document.getElementById("autoplay");
  if (!autoPlay) {
    ok(false, "Can't get the audio element!");
  }

  is(autoPlay.paused, false, "Audio in tab 2 is still playing in the background.");
}

function play_non_autoplay_audio() {
  return new Promise(resolve => {
    var autoPlay = content.document.getElementById("autoplay");
    var nonAutoPlay = content.document.getElementById("nonautoplay");
    if (!autoPlay || !nonAutoPlay) {
      ok(false, "Can't get the audio element!");
    }

    is(nonAutoPlay.paused, true, "Non-autoplay audio isn't started playing yet.");
    nonAutoPlay.play();

    nonAutoPlay.onplay = function() {
      nonAutoPlay.onplay = null;
      is(nonAutoPlay.paused, false, "Start Non-autoplay audio.");
      is(autoPlay.paused, false, "Autoplay audio is still playing.");
      resolve();
    };
  });
}

add_task(async function setup_test_preference() {
  await
    SpecialPowers.pushPrefEnv({"set": [
      ["dom.audiochannel.audioCompeting", true],
      ["dom.ipc.processCount", 1],
    ]});
});

add_task(async function cross_tabs_audio_competing() {
  info("- open tab 1 in foreground -");
  let tab1 = await BrowserTestUtils.openNewForegroundTab(window.gBrowser,
                                                         "about:blank");
  BrowserTestUtils.loadURI(tab1.linkedBrowser, PAGE);
  await waitForTabPlayingEvent(tab1, true);

  info("- open tab 2 in foreground -");
  let tab2 = await BrowserTestUtils.openNewForegroundTab(window.gBrowser,
                                                        "about:blank");
  BrowserTestUtils.loadURI(tab2.linkedBrowser, PAGE);
  await waitForTabPlayingEvent(tab1, false);

  info("- open tab 3 in foreground -");
  let tab3 = await BrowserTestUtils.openNewForegroundTab(window.gBrowser,
                                                         "about:blank");
  await ContentTask.spawn(tab2.linkedBrowser, null,
                          audio_should_keep_playing_even_go_to_background);

  info("- play audio from background tab 1 -");
  await ContentTask.spawn(tab1.linkedBrowser, null,
                          play_audio_from_invisible_tab);

  info("- remove tabs -");
  BrowserTestUtils.removeTab(tab1);
  BrowserTestUtils.removeTab(tab2);
  BrowserTestUtils.removeTab(tab3);
});

add_task(async function within_one_tab_audio_competing() {
  info("- open tab and play audio1 -");
  let tab = await BrowserTestUtils.openNewForegroundTab(window.gBrowser,
                                                        "about:blank");
  BrowserTestUtils.loadURI(tab.linkedBrowser, PAGE);
  await waitForTabPlayingEvent(tab, true);

  info("- play audio2 in the same tab -");
  await ContentTask.spawn(tab.linkedBrowser, null,
                          play_non_autoplay_audio);

  info("- remove tab -");
  BrowserTestUtils.removeTab(tab);
});