/*
 * Strawberry Music Player
 * This code was part of Clementine (GlobalSearch)
 * Copyright 2010, David Sansome <me@davidsansome.com>
 *
 * Strawberry 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.
 *
 * Strawberry 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 Strawberry.  If not, see <http://www.gnu.org/licenses/>.
 *
 */

#include "config.h"

#include <QObject>
#include <QSortFilterProxyModel>
#include <QString>

#include "core/logging.h"
#include "internetsearchmodel.h"
#include "internetsearchsortmodel.h"

InternetSearchSortModel::InternetSearchSortModel(QObject *parent)
    : QSortFilterProxyModel(parent) {}

bool InternetSearchSortModel::lessThan(const QModelIndex &left, const QModelIndex &right) const {
  // Compare the provider sort index first.
  const int index_left = left.data(InternetSearchModel::Role_ProviderIndex).toInt();
  const int index_right = right.data(InternetSearchModel::Role_ProviderIndex).toInt();
  if (index_left < index_right) return true;
  if (index_left > index_right) return false;

  // Dividers always go first
  if (left.data(CollectionModel::Role_IsDivider).toBool()) return true;
  if (right.data(CollectionModel::Role_IsDivider).toBool()) return false;

  // Containers go before songs if they're at the same level
  const bool left_is_container = left.data(CollectionModel::Role_ContainerType).isValid();
  const bool right_is_container = right.data(CollectionModel::Role_ContainerType).isValid();
  if (left_is_container && !right_is_container) return true;
  if (right_is_container && !left_is_container) return false;

  // Containers get sorted on their sort text.
  if (left_is_container) {
    return QString::localeAwareCompare(left.data(CollectionModel::Role_SortText).toString(), right.data(CollectionModel::Role_SortText).toString()) < 0;
  }

  // Otherwise we're comparing songs.  Sort by disc, track, then title.
  const InternetSearch::Result r1 = left.data(InternetSearchModel::Role_Result).value<InternetSearch::Result>();
  const InternetSearch::Result r2 = right.data(InternetSearchModel::Role_Result).value<InternetSearch::Result>();

#define CompareInt(field)                                       \
  if (r1.metadata_.field() < r2.metadata_.field()) return true; \
  if (r1.metadata_.field() > r2.metadata_.field()) return false

  int ret = 0;

#define CompareString(field)                                                     \
  ret = QString::localeAwareCompare(r1.metadata_.field(), r2.metadata_.field()); \
  if (ret < 0) return true;                                                      \
  if (ret > 0) return false

  CompareInt(disc);
  CompareInt(track);
  CompareString(title);

  return false;

#undef CompareInt
#undef CompareString
}