/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
 * http://www.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
 * License.
 *
 * The Original Code is sessionstore test code.
 *
 * The Initial Developer of the Original Code is
 * Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2010
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Paul O’Shannessy <paul@oshannessy.com>
 *
 * Alternatively, the contents of this file may be used under the terms of
 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
 * in which case the provisions of the GPL or the LGPL are applicable instead
 * of those above. If you wish to allow use of your version of this file only
 * under the terms of either the GPL or the LGPL, and not to allow others to
 * use your version of this file under the terms of the MPL, indicate your
 * decision by deleting the provisions above and replace them with the notice
 * and other provisions required by the GPL or the LGPL. If you do not delete
 * the provisions above, a recipient may use your version of this file under
 * the terms of any one of the MPL, the GPL or the LGPL.
 *
 * ***** END LICENSE BLOCK ***** */

const SS_SVC = Cc["@mozilla.org/browser/sessionstore;1"].
               getService(Ci.nsISessionStore);

// This assumes that tests will at least have some state/entries
function waitForBrowserState(aState, aSetStateCallback) {
  let windows = [window];
  let tabsRestored = 0;
  let expectedTabsRestored = 0;
  let expectedWindows = aState.windows.length;
  let windowsOpen = 1;
  let listening = false;
  let windowObserving = false;
  let restoreHiddenTabs = Services.prefs.getBoolPref(
                          "browser.sessionstore.restore_hidden_tabs");

  aState.windows.forEach(function (winState) {
    winState.tabs.forEach(function (tabState) {
      if (restoreHiddenTabs || !tabState.hidden)
        expectedTabsRestored++;
    });
  });

  // There must be only hidden tabs and restoreHiddenTabs = false. We still
  // expect one of them to be restored because it gets shown automatically.
  if (!expectedTabsRestored)
    expectedTabsRestored = 1;

  function onSSTabRestored(aEvent) {
    if (++tabsRestored == expectedTabsRestored) {
      // Remove the event listener from each window
      windows.forEach(function(win) {
        win.gBrowser.tabContainer.removeEventListener("SSTabRestored", onSSTabRestored, true);
      });
      listening = false;
      info("running " + aSetStateCallback.name);
      executeSoon(aSetStateCallback);
    }
  }

  // Used to add our listener to further windows so we can catch SSTabRestored
  // coming from them when creating a multi-window state.
  function windowObserver(aSubject, aTopic, aData) {
    if (aTopic == "domwindowopened") {
      let newWindow = aSubject.QueryInterface(Ci.nsIDOMWindow);
      newWindow.addEventListener("load", function() {
        newWindow.removeEventListener("load", arguments.callee, false);

        if (++windowsOpen == expectedWindows) {
          Services.ww.unregisterNotification(windowObserver);
          windowObserving = false;
        }

        // Track this window so we can remove the progress listener later
        windows.push(newWindow);
        // Add the progress listener
        newWindow.gBrowser.tabContainer.addEventListener("SSTabRestored", onSSTabRestored, true);
      }, false);
    }
  }

  // We only want to register the notification if we expect more than 1 window
  if (expectedWindows > 1) {
    registerCleanupFunction(function() {
      if (windowObserving) {
        Services.ww.unregisterNotification(windowObserver);
      }
    });
    windowObserving = true;
    Services.ww.registerNotification(windowObserver);
  }

  registerCleanupFunction(function() {
    if (listening) {
      windows.forEach(function(win) {
        win.gBrowser.tabContainer.removeEventListener("SSTabRestored", onSSTabRestored, true);
      });
    }
  });
  // Add the event listener for this window as well.
  listening = true;
  gBrowser.tabContainer.addEventListener("SSTabRestored", onSSTabRestored, true);

  // Finally, call setBrowserState
  SS_SVC.setBrowserState(JSON.stringify(aState));
}

// waitForSaveState waits for a state write but not necessarily for the state to
// turn dirty.
function waitForSaveState(aSaveStateCallback) {
  let observing = false;
  let topic = "sessionstore-state-write";

  let sessionSaveTimeout = 1000 +
    Services.prefs.getIntPref("browser.sessionstore.interval");

  function removeObserver() {
    if (!observing)
      return;
    Services.obs.removeObserver(observer, topic, false);
    observing = false;
  }

  let timeout = setTimeout(function () {
    removeObserver();
    aSaveStateCallback();
  }, sessionSaveTimeout);

  function observer(aSubject, aTopic, aData) {
    removeObserver();
    timeout = clearTimeout(timeout);
    executeSoon(aSaveStateCallback);
  }

  registerCleanupFunction(function() {
    removeObserver();
    if (timeout) {
      clearTimeout(timeout);
    }
  });

  observing = true;
  Services.obs.addObserver(observer, topic, false);
};

var gUniqueCounter = 0;
function r() {
  return Date.now() + "-" + (++gUniqueCounter);
}
