/* This file is part of Clementine.
   Copyright 2010, David Sansome <me@davidsansome.com>

   Clementine 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 3 of the License, or
   (at your option) any later version.

   Clementine 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 Clementine.  If not, see <http://www.gnu.org/licenses/>.
*/

#include "gpodloader.h"

#include <gpod/itdb.h>

#include <QDir>
#include <QtDebug>

#include "connecteddevice.h"
#include "core/logging.h"
#include "core/song.h"
#include "core/taskmanager.h"
#include "library/librarybackend.h"

GPodLoader::GPodLoader(const QString& mount_point, TaskManager* task_manager,
                       std::shared_ptr<LibraryBackend> backend,
                       std::shared_ptr<ConnectedDevice> device)
    : QObject(nullptr),
      device_(device),
      mount_point_(mount_point),
      type_(Song::Type_Unknown),
      task_manager_(task_manager),
      backend_(backend) {
  original_thread_ = thread();
}

GPodLoader::~GPodLoader() {}

void GPodLoader::LoadDatabase() {
  int task_id = task_manager_->StartTask(tr("Loading iPod database"));
  emit TaskStarted(task_id);

  // Load the iTunes database
  GError* error = nullptr;
  Itdb_iTunesDB* db =
      itdb_parse(QDir::toNativeSeparators(mount_point_).toLocal8Bit(), &error);

  // Check for errors
  if (!db) {
    if (error) {
      qLog(Error) << "loading database failed:"
                  << QString::fromUtf8(error->message);
      emit Error(QString::fromUtf8(error->message));
      g_error_free(error);
    } else {
      emit Error(tr("An error occurred loading the iTunes database"));
    }

    task_manager_->SetTaskFinished(task_id);
    return;
  }

  // Convert all the tracks from libgpod structs into Song classes
  const QString prefix = path_prefix_.isEmpty()
                             ? QDir::fromNativeSeparators(mount_point_)
                             : path_prefix_;

  SongList songs;
  for (GList* tracks = db->tracks; tracks != nullptr; tracks = tracks->next) {
    Itdb_Track* track = static_cast<Itdb_Track*>(tracks->data);

    Song song;
    song.InitFromItdb(track, prefix);
    song.set_directory_id(1);

    if (type_ != Song::Type_Unknown) song.set_filetype(type_);
    songs << song;
  }

  // Need to remove all the existing songs in the database first
  backend_->DeleteSongs(backend_->FindSongsInDirectory(1));

  // Add the songs we've just loaded
  backend_->AddOrUpdateSongs(songs);

  moveToThread(original_thread_);

  task_manager_->SetTaskFinished(task_id);
  emit LoadFinished(db);
}