const VIDEO_PAGE = "https://example.com/browser/toolkit/content/tests/browser/file_video.html";

function setup_test_preference(enableUserGesture) {
  let state = enableUserGesture ? "enable" : "disable";
  info(`- set pref : ${state} user gesture -`);
  return SpecialPowers.pushPrefEnv({"set": [
    ["media.autoplay.enabled", false],
    ["media.autoplay.enabled.user-gestures-needed", enableUserGesture]
  ]});
}

async function allow_play_for_played_video() {
  info("- open new tab  -");
  let tab = await BrowserTestUtils.openNewForegroundTab(window.gBrowser,
                                                        "about:blank");
  tab.linkedBrowser.loadURI(VIDEO_PAGE);
  await BrowserTestUtils.browserLoaded(tab.linkedBrowser);

  info("- simulate user-click to start video -");
  await BrowserTestUtils.synthesizeMouseAtCenter("#v", {button: 0},
                                                 tab.linkedBrowser);

  async function play_video_again() {
    let video = content.document.getElementById("v");
    ok(!video.paused, "video is playing");

    info("- call video play() again -");
    try {
      await video.play();
      ok(true, "success to resolve play promise");
    } catch (e) {
      ok(false, "promise should not be rejected");
    }
  }
  await ContentTask.spawn(tab.linkedBrowser, null, play_video_again);

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

add_task(async function start_test() {
  await setup_test_preference(true);
  await allow_play_for_played_video();

  await setup_test_preference(false);
  await allow_play_for_played_video();
});
