/*
 * 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 "torrentadditiondlg.h"

torrentAdditionDialog::torrentAdditionDialog(GUI *parent, Bittorrent* _BTSession) : QDialog((QWidget*)parent), old_label(""), hidden_height(0) {
  setupUi(this);
  setAttribute(Qt::WA_DeleteOnClose);
  connect(this, SIGNAL(torrentPaused(QTorrentHandle&)), parent->getTransferList(), SLOT(pauseTorrent(QTorrentHandle&)));
  BTSession = _BTSession;
  // Set Properties list model
  PropListModel = new TorrentFilesModel();
  torrentContentList->setModel(PropListModel);
  torrentContentList->hideColumn(PROGRESS);
  PropDelegate = new PropListDelegate();
  torrentContentList->setItemDelegate(PropDelegate);
  connect(torrentContentList, SIGNAL(clicked(const QModelIndex&)), torrentContentList, SLOT(edit(const QModelIndex&)));
  connect(torrentContentList, SIGNAL(customContextMenuRequested(const QPoint&)), this, SLOT(displayContentListMenu(const QPoint&)));
  connect(collapseAllButton, SIGNAL(clicked()), torrentContentList, SLOT(collapseAll()));
  connect(expandAllButton, SIGNAL(clicked()), torrentContentList, SLOT(expandAll()));
  connect(comboLabel, SIGNAL(editTextChanged(QString)), this, SLOT(updateLabelInSavePath(QString)));
  connect(comboLabel, SIGNAL(currentIndexChanged(QString)), this, SLOT(updateLabelInSavePath(QString)));
  // Remember columns width
  readSettings();
  //torrentContentList->header()->setResizeMode(0, QHeaderView::Stretch);
  defaultSavePath = Preferences::getSavePath();
  appendLabelToSavePath = Preferences::appendTorrentLabel();
  QString display_path = defaultSavePath;
#if defined(Q_WS_WIN) || defined(Q_OS_OS2)
  display_path = display_path.replace("/", "\\");
#endif
  savePathTxt->setText(display_path);
  if(Preferences::addTorrentsInPause()) {
    addInPause->setChecked(true);
    //addInPause->setEnabled(false);
  }
#if LIBTORRENT_VERSION_MINOR < 15
  addInSeed->setVisible(false);
#endif
  // Set Add button as default
  OkButton->setDefault(true);
}

torrentAdditionDialog::~torrentAdditionDialog() {
  saveSettings();
  delete PropDelegate;
  delete PropListModel;
}

void torrentAdditionDialog::readSettings() {
  QSettings settings(QString::fromUtf8("qBittorrent"), QString::fromUtf8("qBittorrent"));
  // Restore size and position
  resize(settings.value(QString::fromUtf8("TorrentAdditionDlg/size"), size()).toSize());
  move(settings.value(QString::fromUtf8("TorrentAdditionDlg/pos"), misc::screenCenter(this)).toPoint());
  // Restore column width
  const QList<int> &contentColsWidths = misc::intListfromStringList(settings.value(QString::fromUtf8("TorrentAdditionDlg/filesColsWidth")).toStringList());
  if(contentColsWidths.empty()) {
    torrentContentList->header()->resizeSection(0, 200);
  } else {
    for(int i=0; i<contentColsWidths.size(); ++i) {
      torrentContentList->setColumnWidth(i, contentColsWidths.at(i));
    }
  }
}

void torrentAdditionDialog::saveSettings() {
  QSettings settings(QString::fromUtf8("qBittorrent"), QString::fromUtf8("qBittorrent"));
  if(!is_magnet && t.get() && t->is_valid() && t->num_files() > 1) {
    QStringList contentColsWidths;
    // -1 because we hid PROGRESS column
    for(int i=0; i<PropListModel->columnCount()-1; ++i) {
      contentColsWidths << QString::number(torrentContentList->columnWidth(i));
    }
    settings.setValue(QString::fromUtf8("TorrentAdditionDlg/filesColsWidth"), contentColsWidths);
  }
  settings.setValue("TorrentAdditionDlg/size", size()+QSize(0, hidden_height));
  qDebug("pos: (%d, %d)", pos().x(), pos().y());
  settings.setValue("TorrentAdditionDlg/pos", pos());
}

void torrentAdditionDialog::renameTorrentNameInModel(QString file_path) {
  file_path = file_path.replace("\\", "/");
  // Rename in torrent files model too
  PropListModel->setData(PropListModel->index(0, 0), file_path.split("/", QString::SkipEmptyParts).last());
}

void torrentAdditionDialog::hideTorrentContent() {
  // Disable useless widgets
  hidden_height += torrentContentList->height();
  torrentContentList->setVisible(false);
  hidden_height += torrentContentLbl->height();
  torrentContentLbl->setVisible(false);
  hidden_height += collapseAllButton->height();
  collapseAllButton->setVisible(false);
  expandAllButton->setVisible(false);

  // Resize main window
  setMinimumSize(0, 0);
  resize(width(), height()-hidden_height);
}

void torrentAdditionDialog::showLoadMagnetURI(QString magnet_uri) {
  show();
  is_magnet = true;
  this->from_url = magnet_uri;

  // Get torrent hash
  hash = misc::magnetUriToHash(magnet_uri);
  if(hash.isEmpty()) {
    BTSession->addConsoleMessage(tr("Unable to decode magnet link:")+QString::fromUtf8(" '")+from_url+QString::fromUtf8("'"), QString::fromUtf8("red"));
    return;
  }
  fileName = misc::magnetUriToName(magnet_uri);
  if(fileName.isEmpty()) {
    fileName = tr("Magnet Link");
  } else {
    QString save_path = savePathTxt->text();
    if(!save_path.endsWith(QDir::separator()))
      save_path += QDir::separator();
    savePathTxt->setText(save_path + fileName);
  }
  fileNameLbl->setText(QString::fromUtf8("<center><b>")+fileName+QString::fromUtf8("</b></center>"));
  // Update display
  updateDiskSpaceLabels();
  // Load custom labels
  QSettings settings(QString::fromUtf8("qBittorrent"), QString::fromUtf8("qBittorrent"));
  settings.beginGroup(QString::fromUtf8("TransferListFilters"));
  QStringList customLabels = settings.value("customLabels", QStringList()).toStringList();
  comboLabel->addItem("");
  foreach(const QString& label, customLabels) {
    comboLabel->addItem(label);
  }
  // No need to display torrent content
  hideTorrentContent();
}

void torrentAdditionDialog::showLoad(QString filePath, QString from_url) {
  is_magnet = false;
  if(!QFile::exists(filePath)) {
    close();
    return;
  }
  this->filePath = filePath;
  this->from_url = from_url;
  // Getting torrent file informations
  try {
    t = new torrent_info(filePath.toUtf8().data());
    if(!t->is_valid())
      throw std::exception();
  } catch(std::exception&) {
    qDebug("Caught error loading torrent");
    if(!from_url.isNull()){
      BTSession->addConsoleMessage(tr("Unable to decode torrent file:")+QString::fromUtf8(" '")+from_url+QString::fromUtf8("'"), QString::fromUtf8("red"));
      QFile::remove(filePath);
    }else{
      BTSession->addConsoleMessage(tr("Unable to decode torrent file:")+QString::fromUtf8(" '")+filePath+QString::fromUtf8("'"), QString::fromUtf8("red"));
    }
    close();
    return;
  }
  nbFiles = t->num_files();
  if(nbFiles == 0) {
    // Empty torrent file!?
    close();
    return;
  }
  if(nbFiles == 1) {
    // Update properties model whenever the file path is edited
    connect(savePathTxt, SIGNAL(textChanged(QString)), this, SLOT(renameTorrentNameInModel(QString)));
  }
  QString root_folder = misc::truncateRootFolder(t);
  QString save_path = savePathTxt->text();
#if defined(Q_WS_WIN) || defined(Q_OS_OS2)
  save_path = save_path.replace("/", "\\");
#endif
  if(!save_path.endsWith(QDir::separator()))
    save_path += QDir::separator();
  // If the torrent has a root folder, append it to the save path
  if(!root_folder.isEmpty()) {
    savePathTxt->setText(save_path + root_folder + QDir::separator());
  }
  if(nbFiles == 1) {
    // single file torrent
    QString single_file_relpath = misc::toQStringU(t->file_at(0).path.string());
#if defined(Q_WS_WIN) || defined(Q_OS_OS2)
    single_file_relpath = single_file_relpath.replace("/", "\\");
#endif
    savePathTxt->setText(save_path+single_file_relpath);
  }
  // Setting file name
  fileName = misc::toQStringU(t->name());
  hash = misc::toQString(t->info_hash());
  // Use left() to remove .old extension
  QString newFileName;
  if(fileName.endsWith(QString::fromUtf8(".old"))){
    newFileName = fileName.left(fileName.size()-4);
  }else{
    newFileName = fileName;
  }
  fileNameLbl->setText(QString::fromUtf8("<center><b>")+newFileName+QString::fromUtf8("</b></center>"));
  if(t->num_files() > 1) {
    // List files in torrent
    PropListModel->setupModelData(*t);
    // Expand first item if possible
    torrentContentList->expand(PropListModel->index(0, 0));
    connect(PropDelegate, SIGNAL(filteredFilesChanged()), this, SLOT(updateDiskSpaceLabels()));
    // Loads files path in the torrent
    for(uint i=0; i<nbFiles; ++i) {
      files_path << misc::toQStringU(t->file_at(i).path.string());
    }
  }
  connect(savePathTxt, SIGNAL(textChanged(QString)), this, SLOT(updateDiskSpaceLabels()));
  updateDiskSpaceLabels();
  // Load custom labels
  QSettings settings(QString::fromUtf8("qBittorrent"), QString::fromUtf8("qBittorrent"));
  settings.beginGroup(QString::fromUtf8("TransferListFilters"));
  const QStringList &customLabels = settings.value("customLabels", QStringList()).toStringList();
  comboLabel->addItem("");
  foreach(const QString& label, customLabels) {
    comboLabel->addItem(label);
  }
  // Show the dialog
  show();
  if(t->num_files() <= 1)
    hideTorrentContent();
}

void torrentAdditionDialog::displayContentListMenu(const QPoint&) {
  QMenu myFilesLlistMenu;
  const QModelIndexList &selectedRows = torrentContentList->selectionModel()->selectedRows(0);
  QAction *actRename = 0;
  if(selectedRows.size() == 1 && t->num_files() > 1) {
    actRename = myFilesLlistMenu.addAction(QIcon(QString::fromUtf8(":/Icons/oxygen/edit_clear.png")), tr("Rename..."));
    myFilesLlistMenu.addSeparator();
  }
  QMenu subMenu;
  subMenu.setTitle(tr("Priority"));
  subMenu.addAction(actionNormal);
  subMenu.addAction(actionHigh);
  subMenu.addAction(actionMaximum);
  myFilesLlistMenu.addMenu(&subMenu);
  // Call menu
  QAction *act = myFilesLlistMenu.exec(QCursor::pos());
  if(act) {
    if(act == actRename) {
      renameSelectedFile();
    } else {
      int prio = 1;
      if(act == actionHigh) {
        prio = HIGH;
      } else {
        if(act == actionMaximum) {
          prio = MAXIMUM;
        }
      }
      qDebug("Setting files priority");
      foreach(const QModelIndex &index, selectedRows) {
        qDebug("Setting priority(%d) for file at row %d", prio, index.row());
        PropListModel->setData(PropListModel->index(index.row(), PRIORITY, index.parent()), prio);
      }
    }
  }
}

void torrentAdditionDialog::renameSelectedFile() {
  const QModelIndexList &selectedIndexes = torrentContentList->selectionModel()->selectedRows(0);
  Q_ASSERT(selectedIndexes.size() == 1);
  const QModelIndex &index = selectedIndexes.first();
  // Ask for new name
  bool ok;
  const QString &new_name_last = QInputDialog::getText(this, tr("Rename the file"),
                                                       tr("New name:"), QLineEdit::Normal,
                                                       index.data().toString(), &ok);
  if (ok && !new_name_last.isEmpty()) {
    if(!misc::isValidFileSystemName(new_name_last)) {
      QMessageBox::warning(this, tr("The file could not be renamed"),
                           tr("This file name contains forbidden characters, please choose a different one."),
                           QMessageBox::Ok);
      return;
    }
    if(PropListModel->getType(index)==TFILE) {
      // File renaming
      const uint file_index = PropListModel->getFileIndex(index);
      QString old_name = files_path.at(file_index);
      old_name = old_name.replace("\\", "/");
      qDebug("Old name: %s", qPrintable(old_name));
      QStringList path_items = old_name.split("/");
      path_items.removeLast();
      path_items << new_name_last;
      QString new_name = path_items.join("/");
      if(old_name == new_name) {
        qDebug("Name did not change");
        return;
      }
      new_name = QDir::cleanPath(new_name);
      qDebug("New name: %s", qPrintable(new_name));
      // Check if that name is already used
      for(uint i=0; i<nbFiles; ++i) {
        if(i == file_index) continue;
#if defined(Q_WS_X11) || defined(Q_WS_MAC) || defined(Q_WS_QWS)
        if(files_path.at(i).compare(new_name, Qt::CaseSensitive) == 0) {
#else
          if(files_path.at(i).compare(new_name, Qt::CaseInsensitive) == 0) {
#endif
            // Display error message
            QMessageBox::warning(this, tr("The file could not be renamed"),
                                 tr("This name is already in use in this folder. Please use a different name."),
                                 QMessageBox::Ok);
            return;
          }
        }
        new_name = QDir::cleanPath(new_name);
        qDebug("Renaming %s to %s", qPrintable(old_name), qPrintable(new_name));
        // Rename file in files_path
        files_path.replace(file_index, new_name);
        // Rename in torrent files model too
        PropListModel->setData(index, new_name_last);
      } else {
        // Folder renaming
        QStringList path_items;
        path_items << index.data().toString();
        QModelIndex parent = PropListModel->parent(index);
        while(parent.isValid()) {
          path_items.prepend(parent.data().toString());
          parent = PropListModel->parent(parent);
        }
        const QString &old_path = path_items.join("/");
        path_items.removeLast();
        path_items << new_name_last;
        QString new_path = path_items.join("/");
        if(!new_path.endsWith("/")) new_path += "/";
        // Check for overwriting
        for(uint i=0; i<nbFiles; ++i) {
          const QString &current_name = files_path.at(i);
#if defined(Q_WS_X11) || defined(Q_WS_MAC) || defined(Q_WS_QWS)
          if(current_name.startsWith(new_path, Qt::CaseSensitive)) {
#else
            if(current_name.startsWith(new_path, Qt::CaseInsensitive)) {
#endif
              QMessageBox::warning(this, tr("The folder could not be renamed"),
                                   tr("This name is already in use in this folder. Please use a different name."),
                                   QMessageBox::Ok);
              return;
            }
          }
          // Replace path in all files
          for(uint i=0; i<nbFiles; ++i) {
            const QString &current_name = files_path.at(i);
            if(current_name.startsWith(old_path)) {
              QString new_name = current_name;
              new_name.replace(0, old_path.length(), new_path);
              new_name = QDir::cleanPath(new_name);
              qDebug("Rename %s to %s", qPrintable(current_name), qPrintable(new_name));
              // Rename in files_path
              files_path.replace(i, new_name);
            }
          }
          // Rename folder in torrent files model too
          PropListModel->setData(index, new_name_last);
        }
      }
    }

    void torrentAdditionDialog::updateDiskSpaceLabels() {
      const long long available = misc::freeDiskSpaceOnPath(misc::expandPath(savePathTxt->text()));
      lbl_disk_space->setText(misc::friendlyUnit(available));
      if(!is_magnet) {
        // Determine torrent size
        qulonglong torrent_size = 0;
        if(t->num_files() > 1) {
          const unsigned int nbFiles = t->num_files();
          const std::vector<int> &priorities = PropListModel->getFilesPriorities(nbFiles);

          for(unsigned int i=0; i<nbFiles; ++i) {
            if(priorities[i] > 0)
              torrent_size += t->file_at(i).size;
          }
        } else {
          torrent_size = t->total_size();
        }
        lbl_torrent_size->setText(misc::friendlyUnit(torrent_size));

        // Check if free space is sufficient
        if(available > 0) {
          if((unsigned long long)available > torrent_size) {
            // Space is sufficient
            label_space_msg->setText(tr("(%1 left after torrent download)", "e.g. (100MiB left after torrent download)").arg(misc::friendlyUnit(available-torrent_size)));
          } else {
            // Space is unsufficient
            label_space_msg->setText("<font color=\"red\">"+tr("(%1 more are required to download)", "e.g. (100MiB more are required to download)").arg(misc::friendlyUnit(torrent_size-available))+"</font>");
          }
        } else {
          // Available disk space is unknown
          label_space_msg->setText("");
        }
      }
    }

    void torrentAdditionDialog::on_browseButton_clicked(){
      QString new_path;
      QString save_path = savePathTxt->text();
#if defined(Q_WS_WIN) || defined(Q_OS_OS2)
      save_path = save_path.replace("\\", "/");
#endif
      save_path = misc::expandPath(save_path);
      if(t->num_files() == 1) {
        new_path = QFileDialog::getSaveFileName(this, tr("Choose save path"), save_path);
      } else {
        const QDir saveDir(save_path);
        if(!save_path.isEmpty() && saveDir.exists()){
          new_path = QFileDialog::getExistingDirectory(this, tr("Choose save path"), saveDir.absolutePath());
        }else{
          new_path = QFileDialog::getExistingDirectory(this, tr("Choose save path"), QDir::homePath());
        }
      }
      if(!new_path.isEmpty()){
#if defined(Q_WS_WIN) || defined(Q_OS_OS2)
        new_path = new_path.replace("/", "\\");
#endif
        savePathTxt->setText(new_path);
      }
    }

    void torrentAdditionDialog::on_CancelButton_clicked(){
      close();
    }

    bool torrentAdditionDialog::allFiltered() const {
      return PropListModel->allFiltered();
    }

    void torrentAdditionDialog::savePiecesPriorities(){
      qDebug("Saving pieces priorities");
      const std::vector<int> &priorities = PropListModel->getFilesPriorities(t->num_files());
      TorrentTempData::setFilesPriority(hash, priorities);
    }

    void torrentAdditionDialog::on_OkButton_clicked(){
      if(savePathTxt->text().trimmed().isEmpty()){
        QMessageBox::critical(0, tr("Empty save path"), tr("Please enter a save path"));
        return;
      }
      QString save_path = savePathTxt->text();
#if defined(Q_WS_WIN) || defined(Q_OS_OS2)
      save_path = save_path.replace("\\", "/");
#endif
      save_path = misc::expandPath(save_path);
      if(t->num_files() == 1) {
        // Remove file name
        QStringList parts = save_path.split("/", QString::SkipEmptyParts);
        const QString single_file_name = parts.takeLast();
        Q_ASSERT(files_path.isEmpty());
        files_path << single_file_name;
        save_path = "/"+parts.join("/");
      }
      QDir savePath(save_path);
      // Check if savePath exists
      if(!savePath.exists()){
        if(!savePath.mkpath(savePath.path())){
          QMessageBox::critical(0, tr("Save path creation error"), tr("Could not create the save path"));
          return;
        }
      }
      const QString &current_label = comboLabel->currentText().trimmed();
      if (!current_label.isEmpty() && !misc::isValidFileSystemName(current_label)) {
        QMessageBox::warning(this, tr("Invalid label name"), tr("Please don't use any special characters in the label name."));
        return;
      }
      // Save savepath
      TorrentTempData::setSavePath(hash, savePath.path());
      qDebug("Torrent label is: %s", qPrintable(comboLabel->currentText().trimmed()));
      if(!current_label.isEmpty())
        TorrentTempData::setLabel(hash, current_label);
      // Is download sequential?
      TorrentTempData::setSequential(hash, checkIncrementalDL->isChecked());
      // Save files path
      // Loads files path in the torrent
      if(!is_magnet) {
        bool path_changed = false;
        for(uint i=0; i<nbFiles; ++i) {
#if defined(Q_WS_X11) || defined(Q_WS_MAC) || defined(Q_WS_QWS)
          if(files_path.at(i).compare(misc::toQStringU(t->file_at(i).path.string()), Qt::CaseSensitive) != 0) {
#else
            if(files_path.at(i).compare(misc::toQStringU(t->file_at(i).path.string()), Qt::CaseInsensitive) != 0) {
#endif
              path_changed = true;
              break;
            }
          }
          if(path_changed) {
            qDebug("Changing files paths");
            TorrentTempData::setFilesPath(hash, files_path);
          }
        }
#if LIBTORRENT_VERSION_MINOR > 14
        // Skip file checking and directly start seeding
        if(addInSeed->isChecked()) {
          // Check if local file(s) actually exist
          if(is_magnet || QFile::exists(savePathTxt->text())) {
            TorrentTempData::setSeedingMode(hash, true);
          } else {
            QMessageBox::warning(0, tr("Seeding mode error"), tr("You chose to skip file checking. However, local files do not seem to exist in the current destionation folder. Please disable this feature or update the save path."));
            return;
          }
        }
#endif
        // Check if there is at least one selected file
        if(!is_magnet && t->num_files() > 1 && allFiltered()){
          QMessageBox::warning(0, tr("Invalid file selection"), tr("You must select at least one file in the torrent"));
          return;
        }
        // save filtered files
        if(!is_magnet && t->num_files() > 1)
          savePiecesPriorities();
        // Add to download list
        QTorrentHandle h;
        if(is_magnet)
          h = BTSession->addMagnetUri(from_url, false);
        else
          h = BTSession->addTorrent(filePath, false, from_url);
        if(addInPause->isChecked() && h.is_valid()) {
          h.pause();
          emit torrentPaused(h);
        }
        close();
      }

      void torrentAdditionDialog::updateLabelInSavePath(QString label) {
        if(appendLabelToSavePath) {
          savePathTxt->setText(misc::updateLabelInSavePath(defaultSavePath, savePathTxt->text(), old_label, label));
          old_label = label;
        }
      }