main.cpp

/**
 * @file main.cpp Main application code
 *
 * A tray icon which shows the current opening status of the Stratumsphere
 *
 * @date 2012-05-07
 * @author Roland Hieber <rohieb@rohieb.name>
 *
 * Copyright (C) 2012 Roland Hieber <rohieb@rohieb.name>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program. If not, see <http://www.gnu.org/licenses/>.
 */

#include "main.h"
#include <QApplication>
#include <QSystemTrayIcon>
#include <QIcon>
#include <QMenu>
#include <QAction>
#include <QString>
#include <QUrl>
#include <QNetworkRequest>
#include <QDebug>
#include <QTextCodec>
#include <QTimer>
#include <QTranslator>
#include <QJsonObject>
#include <QJsonDocument>
#include <QJsonValue>

#ifdef HAVE_DBUS
#include "freedesktop-notification.h"
#include <QDBusConnection>
#endif // HAVE_DBUS

/**
 * Constructive constructor takes no parameters.
 */
StratumsphereTrayIcon::StratumsphereTrayIcon() : QObject(0), nam_(0),
  trayMenu_(0), trayIcon_(0), status_(UNDEFINED), lastStatus_(UNDEFINED),
  lastStatusBeforeUndefined_(UNDEFINED), timeoutTimer_(0),
  toggleNotifyAction_(0) {

  // set up network connection stuff
  nam_ = new QNetworkAccessManager(this);
  connect(nam_, SIGNAL(finished(QNetworkReply*)), this,
    SLOT(reply(QNetworkReply*)));

#ifdef HAVE_DBUS
  QDBusConnection conn = QDBusConnection::connectToBus(
    QDBusConnection::SystemBus, "org.freedesktop.NetworkManager");
  if(!conn.isConnected()) {
    qDebug() << "Oh. Connection failed:" << conn.lastError();
  } else {
    conn.connect("org.freedesktop.NetworkManager",
      "/org/freedesktop/NetworkManager", "org.freedesktop.NetworkManager",
      "StateChanged", "u", this, SLOT(networkStateChanged(uint)));
  }
#endif // HAVE_DBUS

  // set up icons
  int sizes[] = {16, 22, 32, 64, 128, 256};
  for(const int size : sizes) {
    openIcon_.addFile(QString(":/res/open-%1.png").arg(size));
    closedIcon_.addFile(QString(":/res/closed-%1.png").arg(size));
    undefinedIcon_.addFile(QString(":/res/undefined-%1.png").arg(size));
  }

  // set up menu
  trayMenu_ = new QMenu;

  toggleNotifyAction_ = new QAction(tr("Show &notifications"), this);
  toggleNotifyAction_->setCheckable(true);
  toggleNotifyAction_->setChecked(true);
  trayMenu_->addAction(toggleNotifyAction_);

  updateAction_ = new QAction(tr("&Update status"), trayMenu_);
  connect(updateAction_, SIGNAL(triggered()), this, SLOT(updateStatus()));
  trayMenu_->addAction(updateAction_);

  QAction * exitAction = new QAction(tr("&Exit"), trayMenu_);
  connect(exitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
  trayMenu_->addAction(exitAction);

  // set up tray icon
  trayIcon_ = new QSystemTrayIcon(this);
  trayIcon_->setContextMenu(trayMenu_);
  trayIcon_->setIcon(undefinedIcon_);
  trayIcon_->show();

  // fire up a timer to poll the status every n minutes
  startTimer(updateInterval_ * 1000);

  // also set up the timeout timer
  timeoutTimer_ = new QTimer(this);
  connect(timeoutTimer_, SIGNAL(timeout()), this, SLOT(timeout()));


  updateStatus();
}

/**
 * Destructive destructor is destructive.
 */
StratumsphereTrayIcon::~StratumsphereTrayIcon() {
  if(trayMenu_) {
    delete trayMenu_;
  }
}

/**
 * Update the Stratum 0 opening status and the tray icon
 */
void StratumsphereTrayIcon::updateStatus() {
  qDebug() << QDateTime::currentDateTime().toString() << "updating status";
  updateAction_->setText(tr("Updating…"));
  updateAction_->setEnabled(false);
  QString url("https://status.bytespeicher.org/status.json");
  qDebug() << "fetching" << url;
  nam_->get(QNetworkRequest(QUrl(url)));

  // after timeout, just update icon to unspecified state
  timeoutTimer_->start(timeoutInterval_ * 1000);
}

/**
 * Called when the timeout timer fires. Sets the state to undefined and
 * redraws the tray icon.
 */
void StratumsphereTrayIcon::timeout() {
  qDebug() << "Uh-oh! Timeout!";
  status_ = UNDEFINED;
  refresh();
}

/**
 * Process network reply and update status settings
 */
void StratumsphereTrayIcon::reply(QNetworkReply* nr) {
  qDebug() << "got a reply!";
  timeoutTimer_->stop(); // we don't want the timeout to mess up the balloons

  QString strReply = (QString)nr->readAll();
  QJsonDocument jsonResponse = QJsonDocument::fromJson(strReply.toUtf8());
  QJsonObject jsonObject = jsonResponse.object();

  if(jsonObject["open"].toBool())
  {
      status_ = OPEN;
      qDebug() << "space is open";
  }
  else
  {
      status_ = CLOSED;
      qDebug() << "space is closed";
  }
  lastUpdate_ = QDateTime::currentDateTime();
  qDebug() << "status is" << status_;

  if(jsonObject["state"].isObject())
  {
      QJsonObject jsonStatObj = jsonObject["state"].toObject();
      QDateTime dt;
      dt.setTime_t(jsonStatObj["lastchange"].toInt());

      if(!dt.isValid()) {
        qDebug() << "Oops, I don't know how to interpret timestamp.";
      } else {
        since_ = dt;
      }
  }

  nr->deleteLater();
  refresh();
};

/**
 * Refresh the icon, the context menu and the tooltip text
 */
void StratumsphereTrayIcon::refresh() {
  qDebug() << "refreshing tray icon";
  updateAction_->setEnabled(true);
  updateAction_->setText(tr("&Update status"));

  QString statusText, balloonText;
  QIcon * icon;
  if(status_ == CLOSED) {
    icon = &closedIcon_;
    statusText = tr("Space is closed");
    balloonText = tr("The Bytespeicher has just closed.");
  } else if(status_ == OPEN) {
    icon = &openIcon_;
    statusText = tr("Space is open");
    balloonText = tr("The Bytespeicher has just opened!");
  } else {
    icon = &undefinedIcon_;
    statusText = tr("Could not determine opening status");
  }
  trayIcon_->setIcon(*icon);
  qApp->setWindowIcon(*icon);

  // set tool tip
  QString toolTipText = statusText;
  toolTipText.append("\n");
  toolTipText.append(tr("Status since: %1").
    arg(since_.toString(Qt::DefaultLocaleShortDate)));
  toolTipText.append("\n");
  toolTipText.append(tr("Last update: %1").
    arg(lastUpdate_.toString(Qt::DefaultLocaleShortDate)));
  trayIcon_->setToolTip(toolTipText);

  // set balloon message
  static bool firstTime = true; // don't show at program start
  if(toggleNotifyAction_->isChecked() && !firstTime && lastStatus_ != status_ &&
    lastStatusBeforeUndefined_ != status_ &&  // don't re-show after net loss
    status_ != UNDEFINED) {

    // show tray icon message only if freedesktop notification fails
    bool notificationShown = false;
#ifdef HAVE_DBUS
    notificationShown = showNotification(statusText, balloonText,
      icon->pixmap(128).toImage());
#endif // HAVE_DBUS
    if(!notificationShown) {
      if(QSystemTrayIcon::supportsMessages()) {
        trayIcon_->showMessage(statusText, balloonText);
      } else {
        qDebug() << "It seems your system does not support "
          "QSystemTrayIcon::showMessage(). That's too bad.";
      }
    }
  }
  firstTime = false;
  if(status_ == UNDEFINED && lastStatus_ != UNDEFINED) {
    qDebug() << "saving last before undefined status:" << lastStatus_;
    lastStatusBeforeUndefined_ = lastStatus_;
  }
  lastStatus_ = status_;
}

#ifdef HAVE_DBUS
/**
 * Called when NetworkManager changes its state
 */
void StratumsphereTrayIcon::networkStateChanged(uint state) {
  QString stateRepr;
  switch(state) {
    // just ignore these, we don't know anything for sure
    case 0: break; // NM_STATE_UNKNOWN
    case 1: break; // NM_STATE_ASLEEP
    case 2: break; // NM_STATE_CONNECTING
    case 3: // NM_STATE_CONNECTED
      qDebug() << "NetworkManager state changed to connected";
      updateStatus();
      break;
    case 4: // NM_STATE_DISCONNECTED
      qDebug() << "NetworkManager state changed to disconnected";
      status_ = UNDEFINED;
      refresh();
      break;
    default:
      qDebug() << "NetworkManager state changed to an undefined state o_O" <<
        "(this should not happen!)";
      break;
  }
}
#endif // def HAVE_DBUS


/******************************************************************************/
/* main function                                                              */
/******************************************************************************/

int main(int argc, char * argv[]) {
  QApplication app(argc, argv);
  QTextCodec::setCodecForLocale(QTextCodec::codecForName("UTF-8"));
  QTranslator translator;
  translator.load("lang/main_" + QLocale::system().name());
  app.installTranslator(&translator);
  StratumsphereTrayIcon *sti = new StratumsphereTrayIcon();

  // parse arguments
  QStringList args = app.arguments();
  if(args.contains("--silent") || args.contains("-s")) {
    sti->setNotifications(false);
  }

  int ret = app.exec();

  delete sti;
  return ret;
}

// vim: set tw=80 et sw=2 ts=2: