/**
 * This test is used to ensure we can get the correct document's autoplay policy
 * under different situations.
 * Spec discussion : https://github.com/WICG/autoplay/issues/1
 */
const PAGE = "https://example.com/browser/toolkit/content/tests/browser/file_empty.html";

function setupTestPreferences(isAllowedAutoplay, isAllowedMuted) {
  const autoplayDefault = isAllowedAutoplay ?
    SpecialPowers.Ci.nsIAutoplay.ALLOWED : SpecialPowers.Ci.nsIAutoplay.BLOCKED;
  return SpecialPowers.pushPrefEnv({"set": [
    ["dom.media.autoplay.autoplay-policy-api", true],
    ["media.autoplay.default", autoplayDefault],
    ["media.autoplay.enabled.user-gestures-needed", true],
    ["media.autoplay.allow-muted", isAllowedMuted],
  ]});
}

async function checkAutoplayPolicy(expectedAutoplayPolicy) {
  is(content.document.autoplayPolicy, expectedAutoplayPolicy,
    `Autoplay policy is correct.`);
}

add_task(async function testAutoplayPolicy() {
  await BrowserTestUtils.withNewTab({
    gBrowser,
    url: PAGE,
  }, async browser => {
    info(`- Allow all kinds of media to autoplay -`);
    let isAllowedAutoplay = true;
    let isAllowedMuted = true;
    await setupTestPreferences(isAllowedAutoplay, isAllowedMuted);
    await ContentTask.spawn(browser, "allowed", checkAutoplayPolicy);

    info(`- Allow all kinds of media to autoplay even if changing the pref for muted media -`);
    isAllowedAutoplay = true;
    isAllowedMuted = false;
    await setupTestPreferences(isAllowedAutoplay, isAllowedMuted);
    await ContentTask.spawn(browser, "allowed", checkAutoplayPolicy);

    info(`- Disable autoplay for audible media -`);
    isAllowedAutoplay = false;
    isAllowedMuted = true;
    await setupTestPreferences(isAllowedAutoplay, isAllowedMuted);
    await ContentTask.spawn(browser, "allowed-muted", checkAutoplayPolicy);

    info(`- Disable autoplay for all kinds of media -`);
    isAllowedAutoplay = false;
    isAllowedMuted = false;
    await setupTestPreferences(isAllowedAutoplay, isAllowedMuted);
    await ContentTask.spawn(browser, "disallowed", checkAutoplayPolicy);

    info(`- Simulate user gesture activation which would allow all kinds of media to autoplay -`);
    await ContentTask.spawn(browser, null, async () => {
      content.document.notifyUserGestureActivation();
    });
    await ContentTask.spawn(browser, "allowed", checkAutoplayPolicy);
  });
});