/* 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/>.
*/

#ifndef QUEUE_H
#define QUEUE_H

#include <QAbstractProxyModel>

#include "playlist.h"

class Queue : public QAbstractProxyModel {
  Q_OBJECT

 public:
  Queue(Playlist* parent);

  static const char* kRowsMimetype;

  // Query the queue
  bool is_empty() const;
  int PositionOf(const QModelIndex& source_index) const;
  bool ContainsSourceRow(int source_row) const;
  int PeekNext() const;
  int ItemCount() const;
  quint64 GetTotalLength() const;

  // Modify the queue
  int TakeNext();
  void ToggleTracks(const QModelIndexList& source_indexes);
  void InsertFirst(const QModelIndexList& source_indexes);
  void Clear();
  void Move(const QList<int>& proxy_rows, int pos);
  void MoveUp(int row);
  void MoveDown(int row);
  void Remove(QList<int>& proxy_rows);

  // QAbstractProxyModel
  void setSourceModel(QAbstractItemModel* source_model);
  QModelIndex mapFromSource(const QModelIndex& source_index) const;
  QModelIndex mapToSource(const QModelIndex& proxy_index) const;

  // QAbstractItemModel
  QModelIndex index(int row, int column,
                    const QModelIndex& parent = QModelIndex()) const;
  QModelIndex parent(const QModelIndex& child) const;
  int rowCount(const QModelIndex& parent = QModelIndex()) const;
  int columnCount(const QModelIndex& parent = QModelIndex()) const;
  QVariant data(const QModelIndex& proxy_index, int role) const;
  QVariant headerData(int section, Qt::Orientation orientation, int role) const;
  QStringList mimeTypes() const;
  Qt::DropActions supportedDropActions() const;
  QMimeData* mimeData(const QModelIndexList& indexes) const;
  bool dropMimeData(const QMimeData* data, Qt::DropAction action, int row,
                    int column, const QModelIndex& parent);
  Qt::ItemFlags flags(const QModelIndex& index) const;

 public slots:
  void UpdateSummaryText();

 signals:
  void TotalLengthChanged(const quint64 length);
  void ItemCountChanged(const int count);
  void SummaryTextChanged(const QString& message);

 private slots:
  void SourceDataChanged(const QModelIndex& top_left,
                         const QModelIndex& bottom_right);
  void SourceLayoutChanged();
  void UpdateTotalLength();

 private:
  QList<QPersistentModelIndex> source_indexes_;
  const Playlist* playlist_;
  quint64 total_length_ns_;
  QMetaObject::Connection count_changed_;
};

#endif  // QUEUE_H