/*
 * 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 "TransferListWidget.h"
#include "TransferListDelegate.h"
#include "bittorrent.h"
#include "torrentPersistentData.h"
#include "previewSelect.h"
#include "options_imp.h"
#include <QStandardItemModel>
#include <QSortFilterProxyModel>
#include <QDesktopServices>
#include <QBasicTimer>
#include <QSettings>
#include <QClipboard>
#include <QColor>
#include <QUrl>
#include <QMenu>
#include <vector>

TransferListWidget::TransferListWidget(QWidget *parent, bittorrent *_BTSession): QTreeView(parent) {
  QSettings settings("qBittorrent", "qBittorrent");
  BTSession = _BTSession;

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

  // Create transfer list model
  listModel = new QStandardItemModel(0,10);
  listModel->setHeaderData(NAME, Qt::Horizontal, tr("Name", "i.e: file name"));
  listModel->setHeaderData(SIZE, Qt::Horizontal, tr("Size", "i.e: file size"));
  listModel->setHeaderData(PROGRESS, Qt::Horizontal, tr("Progress", "i.e: % downloaded"));
  listModel->setHeaderData(DLSPEED, Qt::Horizontal, tr("DL Speed", "i.e: Download speed"));
  listModel->setHeaderData(UPSPEED, Qt::Horizontal, tr("UP Speed", "i.e: Upload speed"));
  listModel->setHeaderData(SEEDSLEECH, Qt::Horizontal, tr("Seeds/Leechers", "i.e: full/partial sources"));
  listModel->setHeaderData(RATIO, Qt::Horizontal, tr("Ratio"));
  listModel->setHeaderData(ETA, Qt::Horizontal, tr("ETA", "i.e: Estimated Time of Arrival / Time left"));
  listModel->setHeaderData(PRIORITY, Qt::Horizontal, "#");

  // Set Sort/Filter proxy
  proxyModel = new QSortFilterProxyModel();
  proxyModel->setDynamicSortFilter(true);
  proxyModel->setSourceModel(listModel);
  setModel(proxyModel);

  // Visual settings
  setRootIsDecorated(false);
  setAllColumnsShowFocus(true);
  setSortingEnabled(true);
  hideColumn(PRIORITY);
  hideColumn(HASH);
  loadHiddenColumns();
  setContextMenuPolicy(Qt::CustomContextMenu);

  // Listen for BTSession events
  connect(BTSession, SIGNAL(addedTorrent(QTorrentHandle&)), this, SLOT(addTorrent(QTorrentHandle&)));
  connect(BTSession, SIGNAL(finishedTorrent(QTorrentHandle&)), this, SLOT(setFinished(QTorrentHandle&)));

  // Listen for list events
  connect(this, SIGNAL(doubleClicked(QModelIndex)), this, SLOT(torrentDoubleClicked(QModelIndex)));
  connect(header(), SIGNAL(customContextMenuRequested(const QPoint&)), this, SLOT(displayDLHoSMenu(const QPoint&)));

  // Refresh timer
  refreshTimer = new QBasicTimer();
  refreshTimer->start(settings.value("Preferences/General/RefreshInterval", 1500).toInt(), this);
}

TransferListWidget::~TransferListWidget() {
  saveHiddenColumns();
  delete refreshTimer;
  delete proxyModel;
  delete listModel;
  delete listDelegate;
}

void TransferListWidget::timerEvent(QTimerEvent*) {
  refreshList();
}

void TransferListWidget::addTorrent(QTorrentHandle& h) {
  if(!h.is_valid()) return;
  int row = listModel->rowCount();
  try {
    // Adding torrent to transfer list
    listModel->insertRow(row);
    listModel->setData(listModel->index(row, NAME), QVariant(h.name()));
    listModel->setData(listModel->index(row, SIZE), QVariant((qlonglong)h.actual_size()));
    if(BTSession->isQueueingEnabled() && !h.is_seed())
      listModel->setData(listModel->index(row, PRIORITY), QVariant((int)BTSession->getDlTorrentPriority(h.hash())));
    listModel->setData(listModel->index(row, HASH), QVariant(h.hash()));
    // Pause torrent if it is
    if(h.is_paused()) {
      listModel->setData(listModel->index(row, NAME), QVariant(QIcon(QString::fromUtf8(":/Icons/skin/paused.png"))), Qt::DecorationRole);
      //setRowColor(row, QString::fromUtf8("red"));
    }else{
      listModel->setData(listModel->index(row, NAME), QVariant(QIcon(QString::fromUtf8(":/Icons/skin/stalled.png"))), Qt::DecorationRole);
      //setRowColor(row, QString::fromUtf8("grey"));
    }
  } catch(invalid_handle e) {
    // Remove added torrent
    listModel->removeRow(row);
  }
}

/*void TransferListWidget::setRowColor(int row, QColor color) {
  unsigned int nbColumns = listModel->columnCount()-1;
  for(unsigned int i=0; i<nbColumns; ++i) {
    listModel->setData(listModel->index(row, i), QVariant(color), Qt::ForegroundRole);
  }
}*/

void TransferListWidget::deleteTorrent(int row) {
  listModel->removeRow(row);
}

void TransferListWidget::pauseTorrent(QString hash) {
  pauseTorrent(getRowFromHash(hash));
}

void TransferListWidget::pauseTorrent(int row) {
  qDebug("Torrent visibly paused");
  listModel->setData(listModel->index(row, DLSPEED), QVariant((double)0.0));
  listModel->setData(listModel->index(row, UPSPEED), QVariant((double)0.0));
  listModel->setData(listModel->index(row, ETA), QVariant((qlonglong)-1));
  listModel->setData(listModel->index(row, NAME), QIcon(QString::fromUtf8(":/Icons/skin/paused.png")), Qt::DecorationRole);
  listModel->setData(listModel->index(row, SEEDSLEECH), QVariant(QString::fromUtf8("0/0")));
  //setRowColor(row, QString::fromUtf8("red"));
}

void TransferListWidget::resumeTorrent(int row) {
  QTorrentHandle h = BTSession->getTorrentHandle(getHashFromRow(row));
  if(!h.is_valid()) return;
  if(h.is_seed())
    listModel->setData(listModel->index(row, NAME), QVariant(QIcon(":/Icons/skin/seeding.png")), Qt::DecorationRole);
  updateTorrent(row);
}

void TransferListWidget::updateTorrent(int row) {
  QString hash = getHashFromRow(row);
  QTorrentHandle h = BTSession->getTorrentHandle(hash);
  if(!h.is_valid()) {
    // Delete torrent
    deleteTorrent(row);
    return;
  }
  try {
    if(h.is_paused()) return;
    if(!h.is_seed()) {
      // Queueing code
      if(BTSession->isQueueingEnabled()) {
        listModel->setData(listModel->index(row, PRIORITY), QVariant((int)BTSession->getDlTorrentPriority(hash)));
        if(h.is_queued()) {
          if(h.state() == torrent_status::checking_files || h.state() == torrent_status::queued_for_checking) {
            listModel->setData(listModel->index(row, NAME), QVariant(QIcon(QString::fromUtf8(":/Icons/oxygen/time.png"))), Qt::DecorationRole);
            listModel->setData(listModel->index(row, PROGRESS), QVariant((double)h.progress()));
          }else {
            listModel->setData(listModel->index(row, NAME), QVariant(QIcon(QString::fromUtf8(":/Icons/skin/queued.png"))), Qt::DecorationRole);
            listModel->setData(listModel->index(row, ETA), QVariant((qlonglong)-1));
          }
          // Reset speeds and seeds/leech
          listModel->setData(listModel->index(row, DLSPEED), QVariant((double)0.));
          listModel->setData(listModel->index(row, UPSPEED), QVariant((double)0.));
          listModel->setData(listModel->index(row, SEEDSLEECH), QVariant("0/0"));
          //setRowColor(row, QString::fromUtf8("grey"));
          return;
        }
      }
      // Update
      listModel->setData(listModel->index(row, PROGRESS), QVariant((double)h.progress()));
      listModel->setData(listModel->index(row, DLSPEED), QVariant((double)h.download_payload_rate()));

      // Parse download state
      switch(h.state()) {
      case torrent_status::checking_files:
      case torrent_status::queued_for_checking:
      case torrent_status::checking_resume_data:
        listModel->setData(listModel->index(row, NAME), QVariant(QIcon(QString::fromUtf8(":/Icons/oxygen/time.png"))), Qt::DecorationRole);
        //setRowColor(row, QString::fromUtf8("grey"));
        break;
      case torrent_status::downloading:
      case torrent_status::downloading_metadata:
        if(h.download_payload_rate() > 0) {
          listModel->setData(listModel->index(row, NAME), QVariant(QIcon(QString::fromUtf8(":/Icons/skin/downloading.png"))), Qt::DecorationRole);
          listModel->setData(listModel->index(row, ETA), QVariant((qlonglong)BTSession->getETA(hash)));
          //setRowColor(row, QString::fromUtf8("green"));
        }else{
          listModel->setData(listModel->index(row, NAME), QVariant(QIcon(QString::fromUtf8(":/Icons/skin/stalled.png"))), Qt::DecorationRole);
          listModel->setData(listModel->index(row, ETA), QVariant((qlonglong)-1));
          //setRowColor(row, QApplication::palette().color(QPalette::WindowText));
        }
        listModel->setData(listModel->index(row, UPSPEED), QVariant((double)h.upload_payload_rate()));
        break;
      default:
        listModel->setData(listModel->index(row, ETA), QVariant((qlonglong)-1));
      }
    }

    // Common to both downloads and uploads
    QString tmp = misc::toQString(h.num_seeds(), true);
    if(h.num_complete() >= 0)
      tmp.append(QString("(")+misc::toQString(h.num_complete())+QString(")"));
    tmp.append(QString("/")+misc::toQString(h.num_peers() - h.num_seeds(), true));
    if(h.num_incomplete() >= 0)
      tmp.append(QString("(")+misc::toQString(h.num_incomplete())+QString(")"));
    listModel->setData(listModel->index(row, SEEDSLEECH), QVariant(tmp));
    listModel->setData(listModel->index(row, RATIO), QVariant(misc::toQString(BTSession->getRealRatio(hash))));
    listModel->setData(listModel->index(row, UPSPEED), QVariant((double)h.upload_payload_rate()));
    // FIXME: Add all_time_upload column
  }catch(invalid_handle e) {
    deleteTorrent(row);
    qDebug("Caught Invalid handle exception, lucky us.");
  }
}

void TransferListWidget::setFinished(QTorrentHandle &h) {
  int row = -1;
  try {
    row = getRowFromHash(h.hash());
    if(row >= 0) {
      if(h.is_paused()) {
        listModel->setData(listModel->index(row, NAME), QIcon(":/Icons/skin/paused.png"), Qt::DecorationRole);
        //setRowColor(row, "red");
      }else{
        listModel->setData(listModel->index(row, NAME), QVariant(QIcon(":/Icons/skin/seeding.png")), Qt::DecorationRole);
        //setRowColor(row, "orange");
      }
      listModel->setData(listModel->index(row, ETA), QVariant((qlonglong)-1));
      listModel->setData(listModel->index(row, DLSPEED), QVariant((double)0.));
      listModel->setData(listModel->index(row, PROGRESS), QVariant((double)1.));
      listModel->setData(listModel->index(row, PRIORITY), QVariant((int)-1));
    }
  } catch(invalid_handle e) {
    if(row >= 0) deleteTorrent(row);
  }
}

void TransferListWidget::setRefreshInterval(int t) {
  refreshTimer->start(t, this);
}

void TransferListWidget::refreshList() {
  for(int i=0; i<listModel->rowCount(); ++i) {
    updateTorrent(i);
  }
}

int TransferListWidget::getRowFromHash(QString hash) const{
  QList<QStandardItem *> items = listModel->findItems(hash, Qt::MatchExactly, HASH);
  if(items.empty()) return -1;
  Q_ASSERT(items.size() == 1);
  return items.first()->row();
}

QString TransferListWidget::getHashFromRow(int row) const {
  return listModel->data(listModel->index(row, HASH)).toString();
}

void TransferListWidget::torrentDoubleClicked(QModelIndex index) {
  int row = proxyModel->mapToSource(index).row();
  QString hash = getHashFromRow(row);
  QTorrentHandle h = BTSession->getTorrentHandle(hash);
  if(!h.is_valid()) return;
  int action;
  QSettings settings(QString::fromUtf8("qBittorrent"), QString::fromUtf8("qBittorrent"));
  if(h.is_seed()) {
    action =  settings.value(QString::fromUtf8("Preferences/Downloads/DblClOnTorFN"), 0).toInt();
  } else {
    action = settings.value(QString::fromUtf8("Preferences/Downloads/DblClOnTorDl"), 0).toInt();
  }

  switch(action) {
  case TOGGLE_PAUSE:
    if(h.is_paused()) {
      h.resume();
      resumeTorrent(row);
    } else {
      h.pause();
      pauseTorrent(row);
    }
    break;
  case OPEN_DEST:
    QDesktopServices::openUrl(QUrl(h.save_path()));
    break;
  }
}

void TransferListWidget::startSelectedTorrents() {
  QModelIndexList selectedIndexes = selectionModel()->selectedRows();
  foreach(const QModelIndex &index, selectedIndexes) {
    // Get the file hash
    QString hash = getHashFromRow(index.row());
    QTorrentHandle h = BTSession->getTorrentHandle(hash);
    if(h.is_valid() && h.is_paused()) {
      h.resume();
      resumeTorrent(index.row());
    }
  }
}

void TransferListWidget::startAllTorrents() {
  for(int i=0; i<listModel->rowCount(); ++i) {
    QTorrentHandle h = BTSession->getTorrentHandle(getHashFromRow(i));
    if(h.is_valid() && h.is_paused()) {
      h.resume();
      resumeTorrent(i);
    }
  }
}

void TransferListWidget::pauseSelectedTorrents() {
  QModelIndexList selectedIndexes = selectionModel()->selectedRows();
  foreach(const QModelIndex &index, selectedIndexes) {
    // Get the file hash
    QString hash = getHashFromRow(index.row());
    QTorrentHandle h = BTSession->getTorrentHandle(hash);
    if(h.is_valid() && !h.is_paused()) {
      h.pause();
      qDebug("row: %d", index.row());
      pauseTorrent(index.row());
    }
  }
}

void TransferListWidget::pauseAllTorrents() {
  for(int i=0; i<listModel->rowCount(); ++i) {
    QTorrentHandle h = BTSession->getTorrentHandle(getHashFromRow(i));
    if(h.is_valid() && !h.is_paused()) {
      h.pause();
      pauseTorrent(i);
    }
  }
}

void TransferListWidget::deleteSelectedTorrents() {
  QModelIndexList selectedIndexes = selectionModel()->selectedRows();
  if(!selectedIndexes.empty()) {
    int ret = QMessageBox::question(
        this,
        tr("Deletion confirmation"),
        tr("Are you sure you want to delete the selected torrents from transfer list?"),
        tr("&Yes"), tr("&No"),
        QString(), 0, 1);
    if(ret) return;
    foreach(const QModelIndex &index, selectedIndexes) {
      // Get the file hash
      QString hash = getHashFromRow(index.row());
      deleteTorrent(index.row());
      BTSession->deleteTorrent(hash, false);
    }
  }
}

void TransferListWidget::deletePermSelectedTorrents() {
  QModelIndexList selectedIndexes = selectionModel()->selectedRows();
  if(!selectedIndexes.empty()) {
    int ret = QMessageBox::question(
        this,
        tr("Deletion confirmation"),
        tr("Are you sure you want to delete the selected torrents from transfe list and hard disk?"),
        tr("&Yes"), tr("&No"),
        QString(), 0, 1);
    if(ret) return;
    foreach(const QModelIndex &index, selectedIndexes) {
      // Get the file hash
      QString hash = getHashFromRow(index.row());
      deleteTorrent(index.row());
      BTSession->deleteTorrent(hash, true);
    }
  }
}

// FIXME: Should work only if the tab is displayed
void TransferListWidget::increasePrioSelectedTorrents() {
  QModelIndexList selectedIndexes = selectionModel()->selectedRows();
  foreach(const QModelIndex &index, selectedIndexes) {
    QTorrentHandle h = BTSession->getTorrentHandle(getHashFromRow(index.row()));
    if(h.is_valid() && !h.is_seed()) {
      BTSession->increaseDlTorrentPriority(h.hash());
      updateTorrent(index.row());
    }
  }
}

// FIXME: Should work only if the tab is displayed
void TransferListWidget::decreasePrioSelectedTorrents() {
  QModelIndexList selectedIndexes = selectionModel()->selectedRows();
  foreach(const QModelIndex &index, selectedIndexes) {
    QTorrentHandle h = BTSession->getTorrentHandle(getHashFromRow(index.row()));
    if(h.is_valid() && !h.is_seed()) {
      BTSession->decreaseDlTorrentPriority(h.hash());
      updateTorrent(index.row());
    }
  }
}

// FIXME: Use this function
void TransferListWidget::buySelectedTorrents() const {
  QModelIndexList selectedIndexes = selectionModel()->selectedRows();
  foreach(const QModelIndex &index, selectedIndexes) {
    QTorrentHandle h = BTSession->getTorrentHandle(getHashFromRow(index.row()));
    if(h.is_valid())
      QDesktopServices::openUrl("http://match.sharemonkey.com/?info_hash="+h.hash()+"&n="+h.name()+"&cid=33");
  }
}

//FIXME: Use this function
void TransferListWidget::copySelectedMagnetURIs() const {
  QModelIndexList selectedIndexes = selectionModel()->selectedRows();
  QStringList magnet_uris;
  foreach(const QModelIndex &index, selectedIndexes) {
    QTorrentHandle h = BTSession->getTorrentHandle(getHashFromRow(index.row()));
    if(h.is_valid())
      magnet_uris << misc::toQString(make_magnet_uri(h.get_torrent_info()));
  }
  qApp->clipboard()->setText(magnet_uris.join("\n"));
}

void TransferListWidget::hidePriorityColumn(bool hide) {
  setColumnHidden(PRIORITY, hide);
}

// FIXME: Use it
void TransferListWidget::openSelectedTorrentsFolder() const {
  QModelIndexList selectedIndexes = selectionModel()->selectedRows();
  QStringList pathsList;
  foreach(const QModelIndex &index, selectedIndexes) {
    QTorrentHandle h = BTSession->getTorrentHandle(getHashFromRow(index.row()));
    if(h.is_valid()) {
      QString savePath = h.save_path();
      if(!pathsList.contains(savePath)) {
        pathsList.append(savePath);
        QDesktopServices::openUrl(QUrl(QString("file://")+savePath));
      }
    }
  }
}

// FIXME: Use it
void TransferListWidget::previewSelectedTorrents() {
  QModelIndexList selectedIndexes = selectionModel()->selectedRows();
  QStringList pathsList;
  foreach(const QModelIndex &index, selectedIndexes) {
    QTorrentHandle h = BTSession->getTorrentHandle(getHashFromRow(index.row()));
    if(h.is_valid()) {
      new previewSelect(this, h);
    }
  }
}

// save the hidden columns in settings
void TransferListWidget::saveHiddenColumns() {
  QSettings settings("qBittorrent", "qBittorrent");
  QStringList ishidden_list;
  short nbColumns = listModel->columnCount()-1;

  for(short i=0; i<nbColumns; ++i){
    if(isColumnHidden(i)) {
      ishidden_list << "0";
    } else {
      ishidden_list << "1";
    }
  }
  settings.setValue("TransferListColsHoS", ishidden_list.join(" "));
}

// load the previous settings, and hide the columns
bool TransferListWidget::loadHiddenColumns() {
  QSettings settings("qBittorrent", "qBittorrent");
  QString line = settings.value("TransferListColsHoS", QString()).toString();
  if(line.isEmpty()) return false;
  bool loaded = false;
  QStringList ishidden_list;
  ishidden_list = line.split(' ');
  unsigned int nbCol = ishidden_list.size();
  if(nbCol == (unsigned int)listModel->columnCount()-1) {
    for(unsigned int i=0; i<nbCol; ++i){
      if(ishidden_list.at(i) == "0") {
        setColumnHidden(i, true);
      }
    }
    loaded = true;
  }
  return loaded;
}

// hide/show columns menu
void TransferListWidget::displayDLHoSMenu(const QPoint&){
  QMenu hideshowColumn(this);
  hideshowColumn.setTitle(tr("Column visibility"));
  int lastCol;
  if(BTSession->isQueueingEnabled()) {
    lastCol = PRIORITY;
  } else {
    lastCol = ETA;
  }
  QList<QAction*> actions;
  for(int i=0; i <= lastCol; ++i) {
    QIcon icon;
    if(isColumnHidden(i))
      icon = QIcon(QString::fromUtf8(":/Icons/oxygen/button_cancel.png"));
    else
      icon = QIcon(QString::fromUtf8(":/Icons/oxygen/button_ok.png"));
    actions.append(hideshowColumn.addAction(icon, listModel->headerData(i, Qt::Horizontal).toString()));
  }
  // Call menu
  QAction *act = hideshowColumn.exec(QCursor::pos());
  int col = actions.indexOf(act);
  setColumnHidden(col, !isColumnHidden(col));
}