let testURL =
  "https://example.com/browser/" +
  "uriloader/exthandler/tests/mochitest/protocolHandler.html";

add_task(async function() {
  await SpecialPowers.pushPrefEnv({
    set: [["security.external_protocol_requires_permission", false]],
  });

  // Load a page registering a protocol handler.
  let browser = gBrowser.selectedBrowser;
  BrowserTestUtils.loadURI(browser, testURL);
  await BrowserTestUtils.browserLoaded(browser, false, testURL);

  // Register the protocol handler by clicking the notificationbar button.
  let notificationValue = "Protocol Registration: web+testprotocol";
  let getNotification = () =>
    gBrowser.getNotificationBox().getNotificationWithValue(notificationValue);
  await BrowserTestUtils.waitForCondition(getNotification);
  let notification = getNotification();
  let button = notification.querySelector("button");
  ok(button, "got registration button");
  button.click();

  // Set the new handler as default.
  const protoSvc = Cc[
    "@mozilla.org/uriloader/external-protocol-service;1"
  ].getService(Ci.nsIExternalProtocolService);
  let protoInfo = protoSvc.getProtocolHandlerInfo("web+testprotocol");
  is(
    protoInfo.preferredAction,
    protoInfo.useHelperApp,
    "using a helper application is the preferred action"
  );
  ok(!protoInfo.preferredApplicationHandler, "no preferred handler is set");
  let handlers = protoInfo.possibleApplicationHandlers;
  is(1, handlers.length, "only one handler registered for web+testprotocol");
  let handler = handlers.queryElementAt(0, Ci.nsIHandlerApp);
  ok(handler instanceof Ci.nsIWebHandlerApp, "the handler is a web handler");
  is(
    handler.uriTemplate,
    "https://example.com/foobar?uri=%s",
    "correct url template"
  );
  protoInfo.preferredApplicationHandler = handler;
  protoInfo.alwaysAskBeforeHandling = false;
  const handlerSvc = Cc["@mozilla.org/uriloader/handler-service;1"].getService(
    Ci.nsIHandlerService
  );
  handlerSvc.store(protoInfo);

  const expectedURL =
    "https://example.com/foobar?uri=web%2Btestprotocol%3Atest";

  // Create a framed link:
  await SpecialPowers.spawn(browser, [], async function() {
    let iframe = content.document.createElement("iframe");
    iframe.src = `data:text/html,<a href="web+testprotocol:test">Click me</a>`;
    content.document.body.append(iframe);
    // Can't return this promise because it resolves to the event object.
    await ContentTaskUtils.waitForEvent(iframe, "load");
    iframe.contentDocument.querySelector("a").click();
  });
  let kidContext = browser.browsingContext.children[0];
  await TestUtils.waitForCondition(() => {
    let spec = kidContext.currentWindowGlobal?.documentURI?.spec || "";
    return spec == expectedURL;
  });
  is(
    kidContext.currentWindowGlobal.documentURI.spec,
    expectedURL,
    "Should load in frame."
  );

  // Middle-click a testprotocol link and check the new tab is correct
  let link = "#link";

  let promiseTabOpened = BrowserTestUtils.waitForNewTab(gBrowser, expectedURL);
  await BrowserTestUtils.synthesizeMouseAtCenter(link, { button: 1 }, browser);
  let tab = await promiseTabOpened;
  gBrowser.selectedTab = tab;
  is(
    gURLBar.value,
    expectedURL,
    "the expected URL is displayed in the location bar"
  );
  BrowserTestUtils.removeTab(tab);

  // Shift-click the testprotocol link and check the new window.
  let newWindowPromise = BrowserTestUtils.waitForNewWindow({
    url: expectedURL,
  });
  await BrowserTestUtils.synthesizeMouseAtCenter(
    link,
    { shiftKey: true },
    browser
  );
  let win = await newWindowPromise;
  await BrowserTestUtils.waitForCondition(
    () => win.gBrowser.currentURI.spec == expectedURL
  );
  is(
    win.gURLBar.value,
    expectedURL,
    "the expected URL is displayed in the location bar"
  );
  await BrowserTestUtils.closeWindow(win);

  // Click the testprotocol link and check the url in the current tab.
  let loadPromise = BrowserTestUtils.browserLoaded(browser);
  await BrowserTestUtils.synthesizeMouseAtCenter(link, {}, browser);
  await loadPromise;
  await BrowserTestUtils.waitForCondition(() => gURLBar.value != testURL);
  is(
    gURLBar.value,
    expectedURL,
    "the expected URL is displayed in the location bar"
  );

  // Cleanup.
  protoInfo.preferredApplicationHandler = null;
  handlers.removeElementAt(0);
  handlerSvc.store(protoInfo);
});