/* Any copyright is dedicated to the Public Domain.
 * http://creativecommons.org/publicdomain/zero/1.0/ */

ChromeUtils.import("resource://gre/modules/Promise.jsm", this);

const kDefaultWait = 2000;

function is_element_visible(aElement, aMsg) {
  isnot(aElement, null, "Element should not be null, when checking visibility");
  ok(!BrowserTestUtils.is_hidden(aElement), aMsg);
}

function is_element_hidden(aElement, aMsg) {
  isnot(aElement, null, "Element should not be null, when checking visibility");
  ok(BrowserTestUtils.is_hidden(aElement), aMsg);
}

function open_preferences(aCallback) {
  gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser, "about:preferences");
  let newTabBrowser = gBrowser.getBrowserForTab(gBrowser.selectedTab);
  newTabBrowser.addEventListener("Initialized", function() {
    aCallback(gBrowser.contentWindow);
  }, { capture: true, once: true });
}

function openAndLoadSubDialog(aURL, aFeatures = null, aParams = null, aClosingCallback = null) {
  let promise = promiseLoadSubDialog(aURL);
  content.gSubDialog.open(aURL, aFeatures, aParams, aClosingCallback);
  return promise;
}

function promiseLoadSubDialog(aURL) {
  return new Promise((resolve, reject) => {
    content.gSubDialog._dialogStack.addEventListener("dialogopen", function dialogopen(aEvent) {
      if (aEvent.detail.dialog._frame.contentWindow.location == "about:blank")
        return;
      content.gSubDialog._dialogStack.removeEventListener("dialogopen", dialogopen);

      is(aEvent.detail.dialog._frame.contentWindow.location.toString(), aURL,
        "Check the proper URL is loaded");

      // Check visibility
      is_element_visible(aEvent.detail.dialog._overlay, "Overlay is visible");

      // Check that stylesheets were injected
      let expectedStyleSheetURLs = aEvent.detail.dialog._injectedStyleSheets.slice(0);
      for (let styleSheet of aEvent.detail.dialog._frame.contentDocument.styleSheets) {
        let i = expectedStyleSheetURLs.indexOf(styleSheet.href);
        if (i >= 0) {
          info("found " + styleSheet.href);
          expectedStyleSheetURLs.splice(i, 1);
        }
      }
      is(expectedStyleSheetURLs.length, 0, "All expectedStyleSheetURLs should have been found");

      // Wait for the next event tick to make sure the remaining part of the
      // testcase runs after the dialog gets ready for input.
      executeSoon(() => resolve(aEvent.detail.dialog._frame.contentWindow));
    });
  });
}

/**
 * Waits a specified number of miliseconds for a specified event to be
 * fired on a specified element.
 *
 * Usage:
 *    let receivedEvent = waitForEvent(element, "eventName");
 *    // Do some processing here that will cause the event to be fired
 *    // ...
 *    // Now yield until the Promise is fulfilled
 *    yield receivedEvent;
 *    if (receivedEvent && !(receivedEvent instanceof Error)) {
 *      receivedEvent.msg == "eventName";
 *      // ...
 *    }
 *
 * @param aSubject the element that should receive the event
 * @param aEventName the event to wait for
 * @param aTimeoutMs the number of miliseconds to wait before giving up
 * @returns a Promise that resolves to the received event, or to an Error
 */
function waitForEvent(aSubject, aEventName, aTimeoutMs, aTarget) {
  let eventDeferred = Promise.defer();
  let timeoutMs = aTimeoutMs || kDefaultWait;
  let stack = new Error().stack;
  let timerID = setTimeout(function wfe_canceller() {
    aSubject.removeEventListener(aEventName, listener);
    eventDeferred.reject(new Error(aEventName + " event timeout at " + stack));
  }, timeoutMs);

  var listener = function(aEvent) {
    if (aTarget && aTarget !== aEvent.target)
      return;

    // stop the timeout clock and resume
    clearTimeout(timerID);
    eventDeferred.resolve(aEvent);
  };

  function cleanup(aEventOrError) {
    // unhook listener in case of success or failure
    aSubject.removeEventListener(aEventName, listener);
    return aEventOrError;
  }
  aSubject.addEventListener(aEventName, listener);
  return eventDeferred.promise.then(cleanup, cleanup);
}

function openPreferencesViaOpenPreferencesAPI(aPane, aOptions) {
  return new Promise(resolve => {
    let finalPrefPaneLoaded = TestUtils.topicObserved("sync-pane-loaded", () => true);
    gBrowser.selectedTab = BrowserTestUtils.addTab(gBrowser, "about:blank");
    openPreferences(aPane);
    let newTabBrowser = gBrowser.selectedBrowser;

    newTabBrowser.addEventListener("Initialized", function() {
      newTabBrowser.contentWindow.addEventListener("load", async function() {
        let win = gBrowser.contentWindow;
        let selectedPane = win.history.state;
        await finalPrefPaneLoaded;
        if (!aOptions || !aOptions.leaveOpen)
          gBrowser.removeCurrentTab();
        resolve({ selectedPane });
      }, { once: true });
    }, { capture: true, once: true });
  });
}

async function evaluateSearchResults(keyword, searchReults) {
  searchReults = Array.isArray(searchReults) ? searchReults : [searchReults];
  searchReults.push("header-searchResults");

  let searchInput = gBrowser.contentDocument.getElementById("searchInput");
  searchInput.focus();
  let searchCompletedPromise = BrowserTestUtils.waitForEvent(
    gBrowser.contentWindow, "PreferencesSearchCompleted", evt => evt.detail == keyword);
  EventUtils.sendString(keyword);
  await searchCompletedPromise;

  let mainPrefTag = gBrowser.contentDocument.getElementById("mainPrefPane");
  for (let i = 0; i < mainPrefTag.childElementCount; i++) {
    let child = mainPrefTag.children[i];
    if (searchReults.includes(child.id)) {
      is_element_visible(child, "Should be in search results");
    } else if (child.id) {
      is_element_hidden(child, "Should not be in search results");
    }
  }
}

function waitForMutation(target, opts, cb) {
  return new Promise((resolve) => {
    let observer = new MutationObserver(() => {
      if (!cb || cb(target)) {
        observer.disconnect();
        resolve();
      }
    });
    observer.observe(target, opts);
  });
}