/*
 * Bittorrent Client using Qt4 and libtorrent.
 * Copyright (C) 2010  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 <boost/filesystem/operations.hpp>
#include <boost/filesystem/path.hpp>
#include <boost/filesystem/fstream.hpp>
#include <boost/bind.hpp>

#include <libtorrent/version.hpp>
#include <libtorrent/entry.hpp>
#include <libtorrent/bencode.hpp>
#include <libtorrent/torrent_info.hpp>
#include <libtorrent/file.hpp>
#include <libtorrent/storage.hpp>
#include <libtorrent/hasher.hpp>
#include <libtorrent/file_pool.hpp>
#include <libtorrent/create_torrent.hpp>
#include <QFile>

#include "torrentcreatorthread.h"
#include "misc.h"

using namespace libtorrent;
using namespace boost::filesystem;

// do not include files and folders whose
// name starts with a .
bool file_filter(boost::filesystem::path const& filename)
{
  if (filename.leaf()[0] == '.') return false;
  std::cerr << filename << std::endl;
  return true;
}

void TorrentCreatorThread::create(QString _input_path, QString _save_path, QStringList _trackers, QStringList _url_seeds, QString _comment, bool _is_private, int _piece_size)
{
  input_path = _input_path;
  save_path = _save_path;
  if(QFile(save_path).exists())
    misc::safeRemove(save_path);
  trackers = _trackers;
  url_seeds = _url_seeds;
  comment = _comment;
  is_private = _is_private;
  piece_size = _piece_size;
  path::default_name_check(no_check);
  abort = false;
  start();
}

void sendProgressUpdateSignal(int i, int num, TorrentCreatorThread *parent){
  parent->sendProgressSignal((int)(i*100./(float)num));
}

void TorrentCreatorThread::sendProgressSignal(int progress) {
  emit updateProgress(progress);
}

void TorrentCreatorThread::run() {
  emit updateProgress(0);
  char const* creator_str = "qBittorrent "VERSION;
  try {
    file_storage fs;
#if LIBTORRENT_VERSION_MINOR >= 16
    add_files(fs, input_path.toUtf8().constData(), file_filter);
#else
    // Adding files to the torrent
    path full_path = complete(path(input_path.toUtf8().constData()));
    add_files(fs, full_path, file_filter);
#endif
    if(abort) return;
    create_torrent t(fs, piece_size);

    // Add url seeds
    foreach(const QString &seed, url_seeds){
      t.add_url_seed(seed.trimmed().toLocal8Bit().data());
    }
    foreach(const QString &tracker, trackers) {
      t.add_tracker(tracker.trimmed().toLocal8Bit().data());
    }
    if(abort) return;
    // calculate the hash for all pieces
#if LIBTORRENT_VERSION_MINOR >= 16
    QString parent_path = input_path.replace("\\", "/");
    QStringList parts = parent_path.split("/"/*, QString::SkipEmptyParts*/);
    parts.removeLast();
    parent_path = parts.join("/");
    set_piece_hashes(t, parent_path.toUtf8().constData(), boost::bind<void>(&sendProgressUpdateSignal, _1, t.num_pieces(), this));
#else
    QString parent_path = misc::toQStringU(full_path.branch_path().string());
    set_piece_hashes(t, full_path.branch_path(), boost::bind<void>(&sendProgressUpdateSignal, _1, t.num_pieces(), this));
#endif
    // Set qBittorrent as creator and add user comment to
    // torrent_info structure
    t.set_creator(creator_str);
    t.set_comment((const char*)comment.toUtf8());
    // Is private ?
    t.set_priv(is_private);
    if(abort) return;
    // create the torrent and print it to out
    ofstream out(complete(path((const char*)save_path.toUtf8())), std::ios_base::binary);
    bencode(std::ostream_iterator<char>(out), t.generate());
    emit updateProgress(100);
    emit creationSuccess(save_path, parent_path);
  }
  catch (std::exception& e){
    emit creationFailure(QString::fromUtf8(e.what()));
  }
}