/*
 * 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 <QStandardItemModel>
#include <QSortFilterProxyModel>
#include <QDesktopServices>
#include <QTimer>
#include <QClipboard>
#include <QColor>
#include <QUrl>
#include <QMenu>
#include <QRegExp>
#include <QFileDialog>
#include <QMessageBox>

#include <libtorrent/version.hpp>
#include <vector>
#include <queue>

#include "transferlistwidget.h"
#include "qbtsession.h"
#include "torrentpersistentdata.h"
#include "transferlistdelegate.h"
#include "previewselect.h"
#include "speedlimitdlg.h"
#include "updownratiodlg.h"
#include "options_imp.h"
#include "mainwindow.h"
#include "preferences.h"
#include "torrentmodel.h"
#include "deletionconfirmationdlg.h"
#include "propertieswidget.h"
#include "iconprovider.h"
#include "fs_utils.h"
#include "autoexpandabledialog.h"

using namespace libtorrent;

TransferListWidget::TransferListWidget(QWidget *parent, MainWindow *main_window, QBtSession *_BTSession):
  QTreeView(parent), BTSession(_BTSession), main_window(main_window) {

  setUniformRowHeights(true);
  // Load settings
  bool column_loaded = loadSettings();

  // Create and apply delegate
  listDelegate = new TransferListDelegate(this);
  setItemDelegate(listDelegate);

  // Create transfer list model
  listModel = new TorrentModel(this);

  // Set Sort/Filter proxy
  labelFilterModel = new QSortFilterProxyModel();
  labelFilterModel->setDynamicSortFilter(true);
  labelFilterModel->setSourceModel(listModel);
  labelFilterModel->setFilterKeyColumn(TorrentModelItem::TR_LABEL);
  labelFilterModel->setFilterRole(Qt::DisplayRole);

  statusFilterModel = new QSortFilterProxyModel();
  statusFilterModel->setDynamicSortFilter(true);
  statusFilterModel->setSourceModel(labelFilterModel);
  statusFilterModel->setFilterKeyColumn(TorrentModelItem::TR_STATUS);
  statusFilterModel->setFilterRole(Qt::DisplayRole);

  nameFilterModel = new TransferListSortModel();
  nameFilterModel->setDynamicSortFilter(true);
  nameFilterModel->setSourceModel(statusFilterModel);
  nameFilterModel->setFilterKeyColumn(TorrentModelItem::TR_NAME);
  nameFilterModel->setFilterRole(Qt::DisplayRole);
  nameFilterModel->setSortCaseSensitivity(Qt::CaseInsensitive);

  setModel(nameFilterModel);

  // Visual settings
  setRootIsDecorated(false);
  setAllColumnsShowFocus(true);
  setSortingEnabled(true);
  setSelectionMode(QAbstractItemView::ExtendedSelection);
  setItemsExpandable(false);
  setAutoScroll(true);
  setDragDropMode(QAbstractItemView::DragOnly);
#if defined(Q_OS_MAC)
  setAttribute(Qt::WA_MacShowFocusRect, false);
#endif

  // Default hidden columns
  if (!column_loaded) {
    setColumnHidden(TorrentModelItem::TR_PRIORITY, true);
    setColumnHidden(TorrentModelItem::TR_ADD_DATE, true);
    setColumnHidden(TorrentModelItem::TR_SEED_DATE, true);
    setColumnHidden(TorrentModelItem::TR_UPLIMIT, true);
    setColumnHidden(TorrentModelItem::TR_DLLIMIT, true);
    setColumnHidden(TorrentModelItem::TR_TRACKER, true);
    setColumnHidden(TorrentModelItem::TR_AMOUNT_DOWNLOADED, true);
    setColumnHidden(TorrentModelItem::TR_AMOUNT_UPLOADED, true);
    setColumnHidden(TorrentModelItem::TR_AMOUNT_LEFT, true);
    setColumnHidden(TorrentModelItem::TR_TIME_ELAPSED, true);
    setColumnHidden(TorrentModelItem::TR_SAVE_PATH, true);
    setColumnHidden(TorrentModelItem::TR_COMPLETED, true);
  }

  //Ensure that at least one column is visible at all times
  bool atLeastOne = false;
  for (unsigned int i=0; i<TorrentModelItem::NB_COLUMNS; i++) {
    if (!isColumnHidden(i)) {
      atLeastOne = true;
      break;
    }
  }
  if (!atLeastOne)
    setColumnHidden(TorrentModelItem::TR_NAME, false);

  //When adding/removing columns between versions some may
  //end up being size 0 when the new version is launched with
  //a conf file from the previous version.
  for (unsigned int i=0; i<TorrentModelItem::NB_COLUMNS; i++)
    if (!columnWidth(i))
      resizeColumnToContents(i);

  setContextMenuPolicy(Qt::CustomContextMenu);

  // Listen for list events
  connect(this, SIGNAL(doubleClicked(QModelIndex)), this, SLOT(torrentDoubleClicked(QModelIndex)));
  connect(this, SIGNAL(customContextMenuRequested(const QPoint&)), this, SLOT(displayListMenu(const QPoint&)));
  header()->setContextMenuPolicy(Qt::CustomContextMenu);
  connect(header(), SIGNAL(customContextMenuRequested(const QPoint&)), this, SLOT(displayDLHoSMenu(const QPoint&)));

  editHotkey = new QShortcut(QKeySequence("F2"), this, SLOT(renameSelectedTorrent()), 0, Qt::WidgetShortcut);
  deleteHotkey = new QShortcut(QKeySequence::Delete, this, SLOT(deleteSelectedTorrents()), 0, Qt::WidgetShortcut);
}

TransferListWidget::~TransferListWidget() {
  qDebug() << Q_FUNC_INFO << "ENTER";
  // Save settings
  saveSettings();
  // Clean up
  delete labelFilterModel;
  delete statusFilterModel;
  delete nameFilterModel;
  delete listModel;
  delete listDelegate;
  delete editHotkey;
  delete deleteHotkey;
  qDebug() << Q_FUNC_INFO << "EXIT";
}

TorrentModel* TransferListWidget::getSourceModel() const {
  return listModel;
}

void TransferListWidget::previewFile(QString filePath) {
  openUrl(filePath);
}

void TransferListWidget::setRefreshInterval(int t) {
  qDebug("Settings transfer list refresh interval to %dms", t);
  listModel->setRefreshInterval(t);
}

int TransferListWidget::getRowFromHash(QString hash) const {
  return listModel->torrentRow(hash);
}

inline QString TransferListWidget::getHashFromRow(int row) const {
  return listModel->torrentHash(row);
}

inline QModelIndex TransferListWidget::mapToSource(const QModelIndex &index) const {
  Q_ASSERT(index.isValid());
  if (index.model() == nameFilterModel)
    return labelFilterModel->mapToSource(statusFilterModel->mapToSource(nameFilterModel->mapToSource(index)));
  if (index.model() == statusFilterModel)
    return labelFilterModel->mapToSource(statusFilterModel->mapToSource(index));
  return labelFilterModel->mapToSource(index);
}

inline QModelIndex TransferListWidget::mapFromSource(const QModelIndex &index) const {
  Q_ASSERT(index.isValid());
  Q_ASSERT(index.model() == labelFilterModel);
  return nameFilterModel->mapFromSource(statusFilterModel->mapFromSource(labelFilterModel->mapFromSource(index)));
}

void TransferListWidget::torrentDoubleClicked(const QModelIndex& index) {
  const int row = mapToSource(index).row();
  const QString hash = getHashFromRow(row);
  QTorrentHandle h = BTSession->getTorrentHandle(hash);
  if (!h.is_valid()) return;
  int action;
  if (h.is_seed()) {
    action = Preferences::instance()->getActionOnDblClOnTorrentFn();
  } else {
    action = Preferences::instance()->getActionOnDblClOnTorrentDl();
  }

  switch(action) {
  case TOGGLE_PAUSE:
    if (h.is_paused()) {
      h.resume();
    } else {
      h.pause();
    }
    break;
  case OPEN_DEST:
    const QString path = h.root_path();
    openUrl(path);
  }
}

QStringList TransferListWidget::getSelectedTorrentsHashes() const {
  QStringList hashes;
  const QModelIndexList selectedIndexes = selectionModel()->selectedRows();
  foreach (const QModelIndex &index, selectedIndexes) {
    hashes << getHashFromRow(mapToSource(index).row());
  }
  return hashes;
}

void TransferListWidget::setSelectedTorrentsLocation() {
  const QStringList hashes = getSelectedTorrentsHashes();
  if (hashes.isEmpty()) return;
  QString dir;
  const QDir saveDir(TorrentPersistentData::getSavePath(hashes.first()));
  qDebug("Old save path is %s", qPrintable(saveDir.absolutePath()));
  dir = QFileDialog::getExistingDirectory(this, tr("Choose save path"), saveDir.absolutePath(),
                                          QFileDialog::DontConfirmOverwrite|QFileDialog::ShowDirsOnly|QFileDialog::HideNameFilterDetails);
  if (!dir.isNull()) {
    qDebug("New path is %s", qPrintable(dir));
    // Check if savePath exists
    QDir savePath(fsutils::expandPathAbs(dir));
    qDebug("New path after clean up is %s", qPrintable(savePath.absolutePath()));
    foreach (const QString & hash, hashes) {
      // Actually move storage
      QTorrentHandle h = BTSession->getTorrentHandle(hash);
      if (!BTSession->useTemporaryFolder() || h.is_seed()) {
        if (!savePath.exists()) savePath.mkpath(savePath.absolutePath());
        h.move_storage(savePath.absolutePath());
      } else {
        TorrentPersistentData::saveSavePath(h.hash(), savePath.absolutePath());
        main_window->getProperties()->updateSavePath(h);
      }
    }
  }
}

void TransferListWidget::startSelectedTorrents() {
  const QStringList hashes = getSelectedTorrentsHashes();
  foreach (const QString &hash, hashes) {
    BTSession->resumeTorrent(hash);
  }
}

void TransferListWidget::startVisibleTorrents() {
  QStringList hashes;
  for (int i=0; i<nameFilterModel->rowCount(); ++i) {
    const int row = mapToSource(nameFilterModel->index(i, 0)).row();
    hashes << getHashFromRow(row);
  }
  foreach (const QString &hash, hashes) {
    BTSession->resumeTorrent(hash);
  }
}

void TransferListWidget::pauseSelectedTorrents() {
  const QStringList hashes = getSelectedTorrentsHashes();
  foreach (const QString &hash, hashes) {
    BTSession->pauseTorrent(hash);
  }
}

void TransferListWidget::pauseVisibleTorrents() {
  QStringList hashes;
  for (int i=0; i<nameFilterModel->rowCount(); ++i) {
    const int row = mapToSource(nameFilterModel->index(i, 0)).row();
    hashes << getHashFromRow(row);
  }
  foreach (const QString &hash, hashes) {
    BTSession->pauseTorrent(hash);
  }
}

void TransferListWidget::deleteSelectedTorrents() {
  if (main_window->getCurrentTabWidget() != this) return;
  const QStringList& hashes = getSelectedTorrentsHashes();
  if (hashes.empty()) return;
  QTorrentHandle torrent = BTSession->getTorrentHandle(hashes[0]);
  bool delete_local_files = false;
  if (Preferences::instance()->confirmTorrentDeletion() &&
      !DeletionConfirmationDlg::askForDeletionConfirmation(delete_local_files, hashes.size(), torrent.name()))
    return;
  foreach (const QString &hash, hashes) {
    BTSession->deleteTorrent(hash, delete_local_files);
  }
}

void TransferListWidget::deleteVisibleTorrents() {
  if (nameFilterModel->rowCount() <= 0) return;
  QTorrentHandle torrent = BTSession->getTorrentHandle(getHashFromRow(0));
  bool delete_local_files = false;
  if (Preferences::instance()->confirmTorrentDeletion() &&
      !DeletionConfirmationDlg::askForDeletionConfirmation(delete_local_files, nameFilterModel->rowCount(), torrent.name()))
    return;
  QStringList hashes;
  for (int i=0; i<nameFilterModel->rowCount(); ++i) {
    const int row = mapToSource(nameFilterModel->index(i, 0)).row();
    hashes << getHashFromRow(row);
  }
  foreach (const QString &hash, hashes) {
    BTSession->deleteTorrent(hash, delete_local_files);
  }
}

void TransferListWidget::increasePrioSelectedTorrents() {
  qDebug() << Q_FUNC_INFO;
  if (main_window->getCurrentTabWidget() != this) return;
  const QStringList hashes = getSelectedTorrentsHashes();
  std::priority_queue<QPair<int, QTorrentHandle>, std::vector<QPair<int, QTorrentHandle> >, std::greater<QPair<int, QTorrentHandle> > > torrent_queue;
  // Sort torrents by priority
  foreach (const QString &hash, hashes) {
    try {
      QTorrentHandle h = BTSession->getTorrentHandle(hash);
      if (!h.is_seed()) {
        torrent_queue.push(qMakePair(h.queue_position(), h));
      }
    }catch(invalid_handle&) {}
  }
  // Increase torrents priority (starting with the ones with highest priority)
  while(!torrent_queue.empty()) {
    QTorrentHandle h = torrent_queue.top().second;
    try {
      h.queue_position_up();
    } catch(invalid_handle& h) {}
    torrent_queue.pop();
  }
}

void TransferListWidget::decreasePrioSelectedTorrents() {
  qDebug() << Q_FUNC_INFO;
  if (main_window->getCurrentTabWidget() != this) return;
  const QStringList hashes = getSelectedTorrentsHashes();
  std::priority_queue<QPair<int, QTorrentHandle>, std::vector<QPair<int, QTorrentHandle> >, std::less<QPair<int, QTorrentHandle> > > torrent_queue;
  // Sort torrents by priority
  foreach (const QString &hash, hashes) {
    try {
      QTorrentHandle h = BTSession->getTorrentHandle(hash);
      if (!h.is_seed()) {
        torrent_queue.push(qMakePair(h.queue_position(), h));
      }
    }catch(invalid_handle&) {}
  }
  // Decrease torrents priority (starting with the ones with lowest priority)
  while(!torrent_queue.empty()) {
    QTorrentHandle h = torrent_queue.top().second;
    try {
      h.queue_position_down();
    } catch(invalid_handle& h) {}
    torrent_queue.pop();
  }
}

void TransferListWidget::topPrioSelectedTorrents() {
  if (main_window->getCurrentTabWidget() != this) return;
  const QStringList hashes = getSelectedTorrentsHashes();
  foreach (const QString &hash, hashes) {
    QTorrentHandle h = BTSession->getTorrentHandle(hash);
    if (h.is_valid() && !h.is_seed()) {
      h.queue_position_top();
    }
  }
}

void TransferListWidget::bottomPrioSelectedTorrents() {
  if (main_window->getCurrentTabWidget() != this) return;
  const QStringList hashes = getSelectedTorrentsHashes();
  foreach (const QString &hash, hashes) {
    QTorrentHandle h = BTSession->getTorrentHandle(hash);
    if (h.is_valid() && !h.is_seed()) {
      h.queue_position_bottom();
    }
  }
}

void TransferListWidget::copySelectedMagnetURIs() const {
  QStringList magnet_uris;
  const QStringList hashes = getSelectedTorrentsHashes();
  foreach (const QString &hash, hashes) {
    const QTorrentHandle h = BTSession->getTorrentHandle(hash);
    if (h.is_valid())
      magnet_uris << misc::toQString(make_magnet_uri(h));
  }
  qApp->clipboard()->setText(magnet_uris.join("\n"));
}

void TransferListWidget::hidePriorityColumn(bool hide) {
  qDebug("hidePriorityColumn(%d)", hide);
  setColumnHidden(TorrentModelItem::TR_PRIORITY, hide);
}

void TransferListWidget::openSelectedTorrentsFolder() const {
  QSet<QString> pathsList;
  const QStringList hashes = getSelectedTorrentsHashes();
  foreach (const QString &hash, hashes) {
    const QTorrentHandle h = BTSession->getTorrentHandle(hash);
    if (h.is_valid()) {
      QString rootFolder = h.root_path();
      qDebug("Opening path at %s", qPrintable(rootFolder));
      if (!pathsList.contains(rootFolder)) {
        pathsList.insert(rootFolder);
        openUrl(rootFolder);
      }
    }
  }
}

void TransferListWidget::previewSelectedTorrents() {
  const QStringList hashes = getSelectedTorrentsHashes();
  foreach (const QString &hash, hashes) {
    const QTorrentHandle h = BTSession->getTorrentHandle(hash);
    if (h.is_valid() && h.has_metadata()) {
      new PreviewSelect(this, h);
    }
  }
}

void TransferListWidget::setDlLimitSelectedTorrents() {
  QList<QTorrentHandle> selected_torrents;
  bool first = true;
  bool all_same_limit = true;
  const QStringList hashes = getSelectedTorrentsHashes();
  foreach (const QString &hash, hashes) {
    const QTorrentHandle h = BTSession->getTorrentHandle(hash);
    if (h.is_valid() && !h.is_seed()) {
      selected_torrents << h;
      // Determine current limit for selected torrents
      if (first) {
        first = false;
      } else {
        if (all_same_limit && h.download_limit() != selected_torrents.first().download_limit())
          all_same_limit = false;
      }
    }
  }
  if (selected_torrents.empty()) return;

  bool ok=false;
  int default_limit = -1;
  if (all_same_limit)
    default_limit = selected_torrents.first().download_limit();
  const long new_limit = SpeedLimitDialog::askSpeedLimit(&ok, tr("Torrent Download Speed Limiting"), default_limit, Preferences::instance()->getGlobalDownloadLimit()*1024.);
  if (ok) {
    foreach (const QTorrentHandle &h, selected_torrents) {
      qDebug("Applying download speed limit of %ld Kb/s to torrent %s", (long)(new_limit/1024.), qPrintable(h.hash()));
      BTSession->setDownloadLimit(h.hash(), new_limit);
    }
  }
}

void TransferListWidget::setUpLimitSelectedTorrents() {
  QList<QTorrentHandle> selected_torrents;
  bool first = true;
  bool all_same_limit = true;
  const QStringList hashes = getSelectedTorrentsHashes();
  foreach (const QString &hash, hashes) {
    const QTorrentHandle h = BTSession->getTorrentHandle(hash);
    if (h.is_valid()) {
      selected_torrents << h;
      // Determine current limit for selected torrents
      if (first) {
        first = false;
      } else {
        if (all_same_limit && h.upload_limit() != selected_torrents.first().upload_limit())
          all_same_limit = false;
      }
    }
  }
  if (selected_torrents.empty()) return;

  bool ok=false;
  int default_limit = -1;
  if (all_same_limit)
    default_limit = selected_torrents.first().upload_limit();
  const long new_limit = SpeedLimitDialog::askSpeedLimit(&ok, tr("Torrent Upload Speed Limiting"), default_limit, Preferences::instance()->getGlobalUploadLimit()*1024.);
  if (ok) {
    foreach (const QTorrentHandle &h, selected_torrents) {
      qDebug("Applying upload speed limit of %ld Kb/s to torrent %s", (long)(new_limit/1024.), qPrintable(h.hash()));
      BTSession->setUploadLimit(h.hash(), new_limit);
    }
  }
}

void TransferListWidget::setMaxRatioSelectedTorrents() {
  const QStringList hashes = getSelectedTorrentsHashes();
  if (hashes.isEmpty())
    return;
  bool useGlobalValue;
  qreal currentMaxRatio;
  if (hashes.count() == 1) {
    currentMaxRatio = BTSession->getMaxRatioPerTorrent(hashes.first(), &useGlobalValue);
  } else {
    useGlobalValue = true;
    currentMaxRatio = BTSession->getGlobalMaxRatio();
  }
  UpDownRatioDlg dlg(useGlobalValue, currentMaxRatio, QBtSession::MAX_RATIO, this);
  if (dlg.exec() != QDialog::Accepted)
    return;
  foreach (const QString &hash, hashes) {
    if (dlg.useDefault())
      BTSession->removeRatioPerTorrent(hash);
    else
      BTSession->setMaxRatioPerTorrent(hash, dlg.ratio());
  }
}

void TransferListWidget::recheckSelectedTorrents() {
  QMessageBox::StandardButton ret = QMessageBox::question(this, tr("Recheck confirmation"), tr("Are you sure you want to recheck the selected torrent(s)?"), QMessageBox::Yes|QMessageBox::No, QMessageBox::Yes);
  if (ret != QMessageBox::Yes)
    return;
  const QStringList hashes = getSelectedTorrentsHashes();
  foreach (const QString &hash, hashes) {
    BTSession->recheckTorrent(hash);
  }
}

// hide/show columns menu
void TransferListWidget::displayDLHoSMenu(const QPoint&) {
  QMenu hideshowColumn(this);
  hideshowColumn.setTitle(tr("Column visibility"));
  QList<QAction*> actions;
  for (int i=0; i < listModel->columnCount(); ++i) {
    if (!BTSession->isQueueingEnabled() && i == TorrentModelItem::TR_PRIORITY) {
      actions.append(0);
      continue;
    }
    QAction *myAct = hideshowColumn.addAction(listModel->headerData(i, Qt::Horizontal, Qt::DisplayRole).toString());
    myAct->setCheckable(true);
    myAct->setChecked(!isColumnHidden(i));
    actions.append(myAct);
  }
  int visibleCols = 0;
  for (unsigned int i=0; i<TorrentModelItem::NB_COLUMNS; i++) {
    if (!isColumnHidden(i))
      visibleCols++;

    if (visibleCols > 1)
      break;
  }

  // Call menu
  QAction *act = hideshowColumn.exec(QCursor::pos());
  if (act) {
    int col = actions.indexOf(act);
    Q_ASSERT(col >= 0);
    Q_ASSERT(visibleCols > 0);
    if (!isColumnHidden(col) && visibleCols == 1)
      return;
    qDebug("Toggling column %d visibility", col);
    setColumnHidden(col, !isColumnHidden(col));
    if (!isColumnHidden(col) && columnWidth(col) <= 5)
      setColumnWidth(col, 100);
  }
}

void TransferListWidget::toggleSelectedTorrentsSuperSeeding() const {
  const QStringList hashes = getSelectedTorrentsHashes();
  foreach (const QString &hash, hashes) {
    QTorrentHandle h = BTSession->getTorrentHandle(hash);
    if (h.is_valid() && h.has_metadata()) {
      h.super_seeding(!h.status(0).super_seeding);
    }
  }
}

void TransferListWidget::toggleSelectedTorrentsSequentialDownload() const {
  const QStringList hashes = getSelectedTorrentsHashes();
  foreach (const QString &hash, hashes) {
    QTorrentHandle h = BTSession->getTorrentHandle(hash);
    if (h.is_valid() && h.has_metadata()) {
      bool was_sequential = h.is_sequential_download();
      h.set_sequential_download(!was_sequential);
      if (!was_sequential)
        h.prioritize_first_last_piece(true);
    }
  }
}

void TransferListWidget::toggleSelectedFirstLastPiecePrio() const {
  QStringList hashes = getSelectedTorrentsHashes();
  foreach (const QString &hash, hashes) {
    QTorrentHandle h = BTSession->getTorrentHandle(hash);
    if (h.is_valid() && h.has_metadata()) {
      h.prioritize_first_last_piece(!h.first_last_piece_first());
    }
  }
}

void TransferListWidget::askNewLabelForSelection() {
  // Ask for label
  bool ok;
  bool invalid;
  do {
    invalid = false;
    const QString label = AutoExpandableDialog::getText(this, tr("New Label"), tr("Label:"), QLineEdit::Normal, "", &ok).trimmed();
    if (ok && !label.isEmpty()) {
      if (fsutils::isValidFileSystemName(label)) {
        setSelectionLabel(label);
      } else {
        QMessageBox::warning(this, tr("Invalid label name"), tr("Please don't use any special characters in the label name."));
        invalid = true;
      }
    }
  }while(invalid);
}

bool TransferListWidget::openUrl(const QString &_path) const {
  const QString path = fsutils::fromNativePath(_path);
  // Hack to access samba shares with QDesktopServices::openUrl
  const QString p = path.startsWith("//") ? QString("file:") + path : path;
  return QDesktopServices::openUrl(QUrl::fromLocalFile(p));
}

void TransferListWidget::renameSelectedTorrent() {
  const QModelIndexList selectedIndexes = selectionModel()->selectedRows();
  if (selectedIndexes.size() != 1) return;
  if (!selectedIndexes.first().isValid()) return;
  QModelIndex mi = mapToSource(selectedIndexes.first());
  const QString hash = getHashFromRow(mi.row());
  const QTorrentHandle h = BTSession->getTorrentHandle(hash);
  if (!h.is_valid()) return;
  // Ask for a new Name
  bool ok;
  QString name = AutoExpandableDialog::getText(this, tr("Rename"), tr("New name:"), QLineEdit::Normal, h.name(), &ok);
  if (ok && !name.isEmpty()) {
    name.replace(QRegExp("\r?\n|\r"), " ");
    // Rename the torrent
    listModel->setData(mi, name, Qt::DisplayRole);
  }
}

void TransferListWidget::setSelectionLabel(QString label) {
  const QStringList& hashes = getSelectedTorrentsHashes();
  foreach (const QString &hash, hashes) {
    Q_ASSERT(!hash.isEmpty());
    const int row = getRowFromHash(hash);
    const QString old_label = listModel->data(listModel->index(row, TorrentModelItem::TR_LABEL)).toString();
    listModel->setData(listModel->index(row, TorrentModelItem::TR_LABEL), QVariant(label), Qt::DisplayRole);
    // Update save path if necessary
    QTorrentHandle h = BTSession->getTorrentHandle(hash);
    BTSession->changeLabelInTorrentSavePath(h, old_label, label);
  }
}

void TransferListWidget::removeLabelFromRows(QString label) {
  for (int i=0; i<listModel->rowCount(); ++i) {
    if (listModel->data(listModel->index(i, TorrentModelItem::TR_LABEL)) == label) {
      const QString hash = getHashFromRow(i);
      listModel->setData(listModel->index(i, TorrentModelItem::TR_LABEL), "", Qt::DisplayRole);
      // Update save path if necessary
      QTorrentHandle h = BTSession->getTorrentHandle(hash);
      BTSession->changeLabelInTorrentSavePath(h, label, "");
    }
  }
}

void TransferListWidget::displayListMenu(const QPoint&) {
  QModelIndexList selectedIndexes = selectionModel()->selectedRows();
  if (selectedIndexes.size() == 0)
    return;
  // Create actions
  QAction actionStart(IconProvider::instance()->getIcon("media-playback-start"), tr("Resume", "Resume/start the torrent"), 0);
  connect(&actionStart, SIGNAL(triggered()), this, SLOT(startSelectedTorrents()));
  QAction actionPause(IconProvider::instance()->getIcon("media-playback-pause"), tr("Pause", "Pause the torrent"), 0);
  connect(&actionPause, SIGNAL(triggered()), this, SLOT(pauseSelectedTorrents()));
  QAction actionDelete(IconProvider::instance()->getIcon("edit-delete"), tr("Delete", "Delete the torrent"), 0);
  connect(&actionDelete, SIGNAL(triggered()), this, SLOT(deleteSelectedTorrents()));
  QAction actionPreview_file(IconProvider::instance()->getIcon("view-preview"), tr("Preview file..."), 0);
  connect(&actionPreview_file, SIGNAL(triggered()), this, SLOT(previewSelectedTorrents()));
  QAction actionSet_max_ratio(QIcon(QString::fromUtf8(":/Icons/skin/ratio.png")), tr("Limit share ratio..."), 0);
  connect(&actionSet_max_ratio, SIGNAL(triggered()), this, SLOT(setMaxRatioSelectedTorrents()));
  QAction actionSet_upload_limit(QIcon(QString::fromUtf8(":/Icons/skin/seeding.png")), tr("Limit upload rate..."), 0);
  connect(&actionSet_upload_limit, SIGNAL(triggered()), this, SLOT(setUpLimitSelectedTorrents()));
  QAction actionSet_download_limit(QIcon(QString::fromUtf8(":/Icons/skin/download.png")), tr("Limit download rate..."), 0);
  connect(&actionSet_download_limit, SIGNAL(triggered()), this, SLOT(setDlLimitSelectedTorrents()));
  QAction actionOpen_destination_folder(IconProvider::instance()->getIcon("inode-directory"), tr("Open destination folder"), 0);
  connect(&actionOpen_destination_folder, SIGNAL(triggered()), this, SLOT(openSelectedTorrentsFolder()));
  QAction actionIncreasePriority(IconProvider::instance()->getIcon("go-up"), tr("Move up", "i.e. move up in the queue"), 0);
  connect(&actionIncreasePriority, SIGNAL(triggered()), this, SLOT(increasePrioSelectedTorrents()));
  QAction actionDecreasePriority(IconProvider::instance()->getIcon("go-down"), tr("Move down", "i.e. Move down in the queue"), 0);
  connect(&actionDecreasePriority, SIGNAL(triggered()), this, SLOT(decreasePrioSelectedTorrents()));
  QAction actionTopPriority(IconProvider::instance()->getIcon("go-top"), tr("Move to top", "i.e. Move to top of the queue"), 0);
  connect(&actionTopPriority, SIGNAL(triggered()), this, SLOT(topPrioSelectedTorrents()));
  QAction actionBottomPriority(IconProvider::instance()->getIcon("go-bottom"), tr("Move to bottom", "i.e. Move to bottom of the queue"), 0);
  connect(&actionBottomPriority, SIGNAL(triggered()), this, SLOT(bottomPrioSelectedTorrents()));
  QAction actionSetTorrentPath(IconProvider::instance()->getIcon("inode-directory"), tr("Set location..."), 0);
  connect(&actionSetTorrentPath, SIGNAL(triggered()), this, SLOT(setSelectedTorrentsLocation()));
  QAction actionForce_recheck(IconProvider::instance()->getIcon("document-edit-verify"), tr("Force recheck"), 0);
  connect(&actionForce_recheck, SIGNAL(triggered()), this, SLOT(recheckSelectedTorrents()));
  QAction actionCopy_magnet_link(QIcon(":/Icons/magnet.png"), tr("Copy magnet link"), 0);
  connect(&actionCopy_magnet_link, SIGNAL(triggered()), this, SLOT(copySelectedMagnetURIs()));
  QAction actionSuper_seeding_mode(tr("Super seeding mode"), 0);
  actionSuper_seeding_mode.setCheckable(true);
  connect(&actionSuper_seeding_mode, SIGNAL(triggered()), this, SLOT(toggleSelectedTorrentsSuperSeeding()));
  QAction actionRename(IconProvider::instance()->getIcon("edit-rename"), tr("Rename..."), 0);
  connect(&actionRename, SIGNAL(triggered()), this, SLOT(renameSelectedTorrent()));
  QAction actionSequential_download(tr("Download in sequential order"), 0);
  actionSequential_download.setCheckable(true);
  connect(&actionSequential_download, SIGNAL(triggered()), this, SLOT(toggleSelectedTorrentsSequentialDownload()));
  QAction actionFirstLastPiece_prio(tr("Download first and last piece first"), 0);
  actionFirstLastPiece_prio.setCheckable(true);
  connect(&actionFirstLastPiece_prio, SIGNAL(triggered()), this, SLOT(toggleSelectedFirstLastPiecePrio()));
  // End of actions
  QMenu listMenu(this);
  // Enable/disable pause/start action given the DL state
  bool has_pause = false, has_start = false, has_preview = false;
  bool all_same_super_seeding = true;
  bool super_seeding_mode = false;
  bool all_same_sequential_download_mode = true, all_same_prio_firstlast = true;
  bool sequential_download_mode = false, prioritize_first_last = false;
  bool one_has_metadata = false, one_not_seed = false;
  bool first = true;
  QTorrentHandle h;
  qDebug("Displaying menu");
  foreach (const QModelIndex &index, selectedIndexes) {
    // Get the file name
    QString hash = getHashFromRow(mapToSource(index).row());
    // Get handle and pause the torrent
    h = BTSession->getTorrentHandle(hash);
    if (!h.is_valid()) continue;
    if (h.has_metadata())
      one_has_metadata = true;
    if (!h.is_seed()) {
      one_not_seed = true;
      if (h.has_metadata()) {
        if (first) {
          sequential_download_mode = h.is_sequential_download();
          prioritize_first_last = h.first_last_piece_first();
        } else {
          if (sequential_download_mode != h.is_sequential_download()) {
            all_same_sequential_download_mode = false;
          }
          if (prioritize_first_last != h.first_last_piece_first()) {
            all_same_prio_firstlast = false;
          }
        }
      }
    }
    else {
      if (!one_not_seed && all_same_super_seeding && h.has_metadata()) {
        if (first) {
          super_seeding_mode = h.status(0).super_seeding;
        } else {
          if (super_seeding_mode != h.status(0).super_seeding) {
            all_same_super_seeding = false;
          }
        }
      }
    }
    if (h.is_paused()) {
      if (!has_start) {
        listMenu.addAction(&actionStart);
        has_start = true;
      }
    }else{
      if (!has_pause) {
        listMenu.addAction(&actionPause);
        has_pause = true;
      }
    }
    if (h.has_metadata() && BTSession->isFilePreviewPossible(hash) && !has_preview) {
      has_preview = true;
    }
    first = false;
    if (has_pause && has_start && has_preview && one_not_seed) break;
  }
  listMenu.addSeparator();
  listMenu.addAction(&actionDelete);
  listMenu.addSeparator();
  listMenu.addAction(&actionSetTorrentPath);
  if (selectedIndexes.size() == 1)
    listMenu.addAction(&actionRename);
  // Label Menu
  QStringList customLabels = Preferences::instance()->getTorrentLabels();
  customLabels.sort();
  QList<QAction*> labelActions;
  QMenu *labelMenu = listMenu.addMenu(IconProvider::instance()->getIcon("view-categories"), tr("Label"));
  labelActions << labelMenu->addAction(IconProvider::instance()->getIcon("list-add"), tr("New...", "New label..."));
  labelActions << labelMenu->addAction(IconProvider::instance()->getIcon("edit-clear"), tr("Reset", "Reset label"));
  labelMenu->addSeparator();
  foreach (const QString &label, customLabels) {
    labelActions << labelMenu->addAction(IconProvider::instance()->getIcon("inode-directory"), label);
  }
  listMenu.addSeparator();
  if (one_not_seed)
    listMenu.addAction(&actionSet_download_limit);
  listMenu.addAction(&actionSet_max_ratio);
  listMenu.addAction(&actionSet_upload_limit);
  if (!one_not_seed && all_same_super_seeding && one_has_metadata) {
    actionSuper_seeding_mode.setChecked(super_seeding_mode);
    listMenu.addAction(&actionSuper_seeding_mode);
  }
  listMenu.addSeparator();
  bool added_preview_action = false;
  if (has_preview) {
    listMenu.addAction(&actionPreview_file);
    added_preview_action = true;
  }
  if (one_not_seed && one_has_metadata) {
    if (all_same_sequential_download_mode) {
      actionSequential_download.setChecked(sequential_download_mode);
      listMenu.addAction(&actionSequential_download);
      added_preview_action = true;
    }
    if (all_same_prio_firstlast) {
      actionFirstLastPiece_prio.setChecked(prioritize_first_last);
      listMenu.addAction(&actionFirstLastPiece_prio);
      added_preview_action = true;
    }
  }
  if (added_preview_action)
    listMenu.addSeparator();
  if (one_has_metadata) {
    listMenu.addAction(&actionForce_recheck);
    listMenu.addSeparator();
  }
  listMenu.addAction(&actionOpen_destination_folder);
  if (BTSession->isQueueingEnabled() && one_not_seed) {
    listMenu.addSeparator();
    QMenu *prioMenu = listMenu.addMenu(tr("Priority"));
    prioMenu->addAction(&actionTopPriority);
    prioMenu->addAction(&actionIncreasePriority);
    prioMenu->addAction(&actionDecreasePriority);
    prioMenu->addAction(&actionBottomPriority);
  }
  listMenu.addSeparator();
  listMenu.addAction(&actionCopy_magnet_link);
  // Call menu
  QAction *act = 0;
  act = listMenu.exec(QCursor::pos());
  if (act) {
    // Parse label actions only (others have slots assigned)
    int i = labelActions.indexOf(act);
    if (i >= 0) {
      // Label action
      if (i == 0) {
        // New Label
        askNewLabelForSelection();
      } else {
        QString label = "";
        if (i > 1)
          label = customLabels.at(i-2);
        // Update Label
        setSelectionLabel(label);
      }
    }
  }
}

void TransferListWidget::currentChanged(const QModelIndex& current, const QModelIndex&) {
  qDebug("CURRENT CHANGED");
  QTorrentHandle h;
  if (current.isValid()) {
    const int row = mapToSource(current).row();
    h = BTSession->getTorrentHandle(getHashFromRow(row));
    // Scroll Fix
    scrollTo(current);
  }
  emit currentTorrentChanged(h);
}

void TransferListWidget::applyLabelFilter(QString label) {
  if (label == "all") {
    labelFilterModel->setFilterRegExp(QRegExp());
    return;
  }
  if (label == "none") {
    labelFilterModel->setFilterRegExp(QRegExp("^$"));
    return;
  }
  qDebug("Applying Label filter: %s", qPrintable(label));
  labelFilterModel->setFilterRegExp(QRegExp("^" + QRegExp::escape(label) + "$", Qt::CaseSensitive));
}

void TransferListWidget::applyNameFilter(const QString& name) {
  nameFilterModel->setFilterRegExp(QRegExp(QRegExp::escape(name), Qt::CaseInsensitive));
}

void TransferListWidget::applyStatusFilter(int f) {
  switch(f) {
  case FILTER_DOWNLOADING:
    statusFilterModel->setFilterRegExp(QRegExp(QString::number(TorrentModelItem::STATE_DOWNLOADING)+"|"+QString::number(TorrentModelItem::STATE_STALLED_DL)+"|"+
                                               QString::number(TorrentModelItem::STATE_PAUSED_DL)+"|"+QString::number(TorrentModelItem::STATE_CHECKING_DL)+"|"+
                                               QString::number(TorrentModelItem::STATE_QUEUED_DL)+"|"+QString::number(TorrentModelItem::STATE_DOWNLOADING_META), Qt::CaseSensitive));
    break;
  case FILTER_COMPLETED:
    statusFilterModel->setFilterRegExp(QRegExp(QString::number(TorrentModelItem::STATE_SEEDING)+"|"+QString::number(TorrentModelItem::STATE_STALLED_UP)+"|"+
                                               QString::number(TorrentModelItem::STATE_PAUSED_UP)+"|"+QString::number(TorrentModelItem::STATE_CHECKING_UP)+"|"+
                                               QString::number(TorrentModelItem::STATE_QUEUED_UP), Qt::CaseSensitive));
    break;
  case FILTER_ACTIVE:
    statusFilterModel->setFilterRegExp(QRegExp(QString::number(TorrentModelItem::STATE_DOWNLOADING)+"|"+QString::number(TorrentModelItem::STATE_SEEDING), Qt::CaseSensitive));
    break;
  case FILTER_INACTIVE:
    statusFilterModel->setFilterRegExp(QRegExp("[^"+QString::number(TorrentModelItem::STATE_DOWNLOADING)+QString::number(TorrentModelItem::STATE_SEEDING)+"]", Qt::CaseSensitive));
    break;
  case FILTER_PAUSED:
    statusFilterModel->setFilterRegExp(QRegExp(QString::number(TorrentModelItem::STATE_PAUSED_UP)+"|"+QString::number(TorrentModelItem::STATE_PAUSED_DL)));
    break;
  default:
    statusFilterModel->setFilterRegExp(QRegExp());
  }
  // Select first item if nothing is selected
  if (selectionModel()->selectedRows(0).empty() && nameFilterModel->rowCount() > 0) {
    qDebug("Nothing is selected, selecting first row: %s", qPrintable(nameFilterModel->index(0, TorrentModelItem::TR_NAME).data().toString()));
    selectionModel()->setCurrentIndex(nameFilterModel->index(0, TorrentModelItem::TR_NAME), QItemSelectionModel::SelectCurrent|QItemSelectionModel::Rows);
  }
}

void TransferListWidget::saveSettings()
{
  Preferences::instance()->setTransHeaderState(header()->saveState());
}

bool TransferListWidget::loadSettings()
{
  bool ok = header()->restoreState(Preferences::instance()->getTransHeaderState());
  if (!ok) {
    header()->resizeSection(0, 200); // Default
  }
  return ok;
}