/*
 * Bittorrent Client using Qt4 and libtorrent.
 * Copyright (C) 2006  Christophe Dumez
 *
 * 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 2
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 *
 * In addition, as a special exception, the copyright holders give permission to
 * link this program with the OpenSSL project's "OpenSSL" library (or with
 * modified versions of it that use the same license as the "OpenSSL" library),
 * and distribute the linked executables. You must obey the GNU General Public
 * License in all respects for all of the code used other than "OpenSSL".  If you
 * modify file(s), you may extend this exception to your version of the file(s),
 * but you are not obligated to do so. If you do not wish to do so, delete this
 * exception statement from your version.
 *
 * Contact : chris@qbittorrent.org
 */

#include "statusbar.h"

#include <QFontMetrics>
#include <QDebug>

#include "core/bittorrent/session.h"
#include "core/bittorrent/sessionstatus.h"
#include "speedlimitdlg.h"
#include "guiiconprovider.h"
#include "core/preferences.h"
#include "core/utils/misc.h"
#include "core/logger.h"

StatusBar::StatusBar(QStatusBar *bar)
  : m_bar(bar)
{
  Preferences* const pref = Preferences::instance();
  connect(BitTorrent::Session::instance(), SIGNAL(speedLimitModeChanged(bool)), this, SLOT(updateAltSpeedsBtn(bool)));
  container = new QWidget(bar);
  layout = new QHBoxLayout(container);
  layout->setContentsMargins(0,0,0,0);

  container->setLayout(layout);
  connecStatusLblIcon = new QPushButton(bar);
  connecStatusLblIcon->setFlat(true);
  connecStatusLblIcon->setFocusPolicy(Qt::NoFocus);
  connecStatusLblIcon->setCursor(Qt::PointingHandCursor);
  connecStatusLblIcon->setIcon(QIcon(":/icons/skin/firewalled.png"));
  connecStatusLblIcon->setToolTip(QString::fromUtf8("<b>")+tr("Connection status:")+QString::fromUtf8("</b><br>")+QString::fromUtf8("<i>")+tr("No direct connections. This may indicate network configuration problems.")+QString::fromUtf8("</i>"));
  dlSpeedLbl = new QPushButton(bar);
  dlSpeedLbl->setIcon(QIcon(":/icons/skin/download.png"));
  connect(dlSpeedLbl, SIGNAL(clicked()), this, SLOT(capDownloadSpeed()));
  dlSpeedLbl->setFlat(true);
  dlSpeedLbl->setFocusPolicy(Qt::NoFocus);
  dlSpeedLbl->setCursor(Qt::PointingHandCursor);

  upSpeedLbl = new QPushButton(bar);
  upSpeedLbl->setIcon(QIcon(":/icons/skin/seeding.png"));
  connect(upSpeedLbl, SIGNAL(clicked()), this, SLOT(capUploadSpeed()));
  upSpeedLbl->setFlat(true);
  upSpeedLbl->setFocusPolicy(Qt::NoFocus);
  upSpeedLbl->setCursor(Qt::PointingHandCursor);
  DHTLbl = new QLabel(tr("DHT: %1 nodes").arg(0), bar);
  DHTLbl->setSizePolicy(QSizePolicy::Maximum, QSizePolicy::Preferred);

  altSpeedsBtn = new QPushButton(bar);
  altSpeedsBtn->setFlat(true);
  altSpeedsBtn->setFocusPolicy(Qt::NoFocus);
  altSpeedsBtn->setCursor(Qt::PointingHandCursor);
  updateAltSpeedsBtn(pref->isAltBandwidthEnabled());
  connect(altSpeedsBtn, SIGNAL(clicked()), this, SLOT(toggleAlternativeSpeeds()));

  // Because on some platforms the default icon size is bigger
  // and it will result in taller/fatter statusbar, even if the
  // icons are actually 16x16
  connecStatusLblIcon->setIconSize(QSize(16, 16));
  dlSpeedLbl->setIconSize(QSize(16, 16));
  upSpeedLbl->setIconSize(QSize(16, 16));
  altSpeedsBtn->setIconSize(QSize(28, 16));

  // Set to the known maximum width(plus some padding)
  // so the speed widgets will take the rest of the space
  connecStatusLblIcon->setMaximumWidth(16 + 6);
  altSpeedsBtn->setMaximumWidth(28 + 6);

  statusSep1 = new QFrame(bar);
  statusSep1->setFrameStyle(QFrame::VLine);
  statusSep1->setFrameShadow(QFrame::Raised);
  statusSep2 = new QFrame(bar);
  statusSep2->setFrameStyle(QFrame::VLine);
  statusSep2->setFrameShadow(QFrame::Raised);
  statusSep3 = new QFrame(bar);
  statusSep3->setFrameStyle(QFrame::VLine);
  statusSep3->setFrameShadow(QFrame::Raised);
  statusSep4 = new QFrame(bar);
  statusSep4->setFrameStyle(QFrame::VLine);
  statusSep4->setFrameShadow(QFrame::Raised);
  layout->addWidget(DHTLbl);
  layout->addWidget(statusSep1);
  layout->addWidget(connecStatusLblIcon);
  layout->addWidget(statusSep2);
  layout->addWidget(altSpeedsBtn);
  layout->addWidget(statusSep4);
  layout->addWidget(dlSpeedLbl);
  layout->addWidget(statusSep3);
  layout->addWidget(upSpeedLbl);

  bar->addPermanentWidget(container);
  container->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Preferred);
  bar->setStyleSheet("QWidget {margin: 0;}");
  container->adjustSize();
  bar->adjustSize();
  // Is DHT enabled
  DHTLbl->setVisible(pref->isDHTEnabled());
  refreshTimer = new QTimer(bar);
  refreshStatusBar();
  connect(refreshTimer, SIGNAL(timeout()), this, SLOT(refreshStatusBar()));
  refreshTimer->start(1500);
}

StatusBar::~StatusBar() {
  qDebug() << Q_FUNC_INFO;
}

QPushButton* StatusBar::connectionStatusButton() const {
  return connecStatusLblIcon;
}

void StatusBar::showRestartRequired() {
  // Restart required notification
  const QString restart_text = tr("qBittorrent needs to be restarted");
  QLabel *restartIconLbl = new QLabel(m_bar);
  restartIconLbl->setPixmap(QPixmap(":/icons/oxygen/dialog-warning.png").scaled(QSize(24,24)));
  restartIconLbl->setToolTip(restart_text);
  m_bar->insertWidget(0,restartIconLbl);
  QLabel *restartLbl = new QLabel(m_bar);
  restartLbl->setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Preferred);
  m_bar->insertWidget(1, restartLbl);
  QFontMetrics fm(restartLbl->font());
  restartLbl->setText(fm.elidedText(restart_text, Qt::ElideRight, restartLbl->width()));
  Logger::instance()->addMessage(tr("qBittorrent was just updated and needs to be restarted for the changes to be effective."), Log::CRITICAL);
}

void StatusBar::stopTimer() {
  refreshTimer->stop();
}

void StatusBar::refreshStatusBar() {
  // Update connection status
  const BitTorrent::SessionStatus sessionStatus = BitTorrent::Session::instance()->status();
  if (!BitTorrent::Session::instance()->isListening()) {
    connecStatusLblIcon->setIcon(QIcon(QString::fromUtf8(":/icons/skin/disconnected.png")));
    connecStatusLblIcon->setToolTip(QString::fromUtf8("<b>")+tr("Connection Status:")+QString::fromUtf8("</b><br>")+tr("Offline. This usually means that qBittorrent failed to listen on the selected port for incoming connections."));
  } else {
    if (sessionStatus.hasIncomingConnections()) {
      // Connection OK
      connecStatusLblIcon->setIcon(QIcon(QString::fromUtf8(":/icons/skin/connected.png")));
      connecStatusLblIcon->setToolTip(QString::fromUtf8("<b>")+tr("Connection Status:")+QString::fromUtf8("</b><br>")+tr("Online"));
    }else{
      connecStatusLblIcon->setIcon(QIcon(QString::fromUtf8(":/icons/skin/firewalled.png")));
      connecStatusLblIcon->setToolTip(QString::fromUtf8("<b>")+tr("Connection status:")+QString::fromUtf8("</b><br>")+QString::fromUtf8("<i>")+tr("No direct connections. This may indicate network configuration problems.")+QString::fromUtf8("</i>"));
    }
  }
  // Update Number of DHT nodes
  if (BitTorrent::Session::instance()->isDHTEnabled()) {
    DHTLbl->setVisible(true);
    //statusSep1->setVisible(true);
    DHTLbl->setText(tr("DHT: %1 nodes").arg(QString::number(sessionStatus.dhtNodes())));
  } else {
    DHTLbl->setVisible(false);
    //statusSep1->setVisible(false);
  }
  // Update speed labels
  QString speedLbl = Utils::Misc::friendlyUnit(sessionStatus.payloadDownloadRate(), true)+" ("+Utils::Misc::friendlyUnit(sessionStatus.totalPayloadDownload())+")";
  int speedLimit = BitTorrent::Session::instance()->downloadRateLimit();
  if (speedLimit)
    speedLbl = "["+Utils::Misc::friendlyUnit(speedLimit, true)+"] " + speedLbl;
  dlSpeedLbl->setText(speedLbl);
  speedLimit = BitTorrent::Session::instance()->uploadRateLimit();
  speedLbl = Utils::Misc::friendlyUnit(sessionStatus.payloadUploadRate(), true)+" ("+Utils::Misc::friendlyUnit(sessionStatus.totalPayloadUpload())+")";
  if (speedLimit)
    speedLbl = "["+Utils::Misc::friendlyUnit(speedLimit, true)+"] " + speedLbl;
  upSpeedLbl->setText(speedLbl);
}

void StatusBar::updateAltSpeedsBtn(bool alternative) {
  if (alternative) {
    altSpeedsBtn->setIcon(QIcon(":/icons/slow.png"));
    altSpeedsBtn->setToolTip(tr("Click to switch to regular speed limits"));
    altSpeedsBtn->setDown(true);
  } else {
    altSpeedsBtn->setIcon(QIcon(":/icons/slow_off.png"));
    altSpeedsBtn->setToolTip(tr("Click to switch to alternative speed limits"));
    altSpeedsBtn->setDown(false);
  }
  refreshStatusBar();
}

void StatusBar::toggleAlternativeSpeeds() {
  Preferences* const pref = Preferences::instance();
  if (pref->isSchedulerEnabled())
    m_bar->showMessage(tr("Manual change of rate limits mode. The scheduler is disabled."), 5000);
  BitTorrent::Session::instance()->changeSpeedLimitMode(!pref->isAltBandwidthEnabled());
}

void StatusBar::capDownloadSpeed() {
  bool ok = false;
  int cur_limit = BitTorrent::Session::instance()->downloadRateLimit();
  long new_limit = SpeedLimitDialog::askSpeedLimit(&ok, tr("Global Download Speed Limit"), cur_limit);
  if (ok) {
    Preferences* const pref = Preferences::instance();
    bool alt = pref->isAltBandwidthEnabled();
    if (new_limit <= 0) {
      qDebug("Setting global download rate limit to Unlimited");
      BitTorrent::Session::instance()->setDownloadRateLimit(-1);
      if (!alt)
        pref->setGlobalDownloadLimit(-1);
      else
        pref->setAltGlobalDownloadLimit(-1);
    } else {
      qDebug("Setting global download rate limit to %.1fKb/s", new_limit/1024.);
      BitTorrent::Session::instance()->setDownloadRateLimit(new_limit);
      if (!alt)
        pref->setGlobalDownloadLimit(new_limit/1024.);
      else
        pref->setAltGlobalDownloadLimit(new_limit/1024.);
    }
    refreshStatusBar();
  }
}

void StatusBar::capUploadSpeed() {
  bool ok = false;
  int cur_limit = BitTorrent::Session::instance()->uploadRateLimit();
  long new_limit = SpeedLimitDialog::askSpeedLimit(&ok, tr("Global Upload Speed Limit"), cur_limit);
  if (ok) {
    Preferences* const pref = Preferences::instance();
    bool alt = pref->isAltBandwidthEnabled();
    if (new_limit <= 0) {
      qDebug("Setting global upload rate limit to Unlimited");
      BitTorrent::Session::instance()->setUploadRateLimit(-1);
      if (!alt)
        Preferences::instance()->setGlobalUploadLimit(-1);
      else
        Preferences::instance()->setAltGlobalUploadLimit(-1);
    } else {
      qDebug("Setting global upload rate limit to %.1fKb/s", new_limit/1024.);
      BitTorrent::Session::instance()->setUploadRateLimit(new_limit);
      if (!alt)
        Preferences::instance()->setGlobalUploadLimit(new_limit/1024.);
      else
        Preferences::instance()->setAltGlobalUploadLimit(new_limit/1024.);
    }
    refreshStatusBar();
  }
}