/* 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 PLAYLISTUNDOCOMMANDS_H
#define PLAYLISTUNDOCOMMANDS_H

#include <QUndoCommand>
#include <QCoreApplication>

#include "playlistitem.h"

class Playlist;

namespace PlaylistUndoCommands {
  enum Types {
    Type_RemoveItems = 0,
  };

  class Base : public QUndoCommand {
    Q_DECLARE_TR_FUNCTIONS(PlaylistUndoCommands);

   public:
    Base(Playlist* playlist);

   protected:
    Playlist* playlist_;
  };

  class InsertItems : public Base {
   public:
    InsertItems(Playlist* playlist, const PlaylistItemList& items, int pos,
                bool enqueue = false);

    void undo();
    void redo();
    // When load is async, items have already been pushed, so we need to update them.
    // This function try to find the equivalent item, and replace it with the
    // new (completely loaded) one.
    // return true if the was found (and updated), false otherwise
    bool UpdateItem(const PlaylistItemPtr& updated_item);

   private:
    PlaylistItemList items_;
    int pos_;
    bool enqueue_;
  };

  class RemoveItems : public Base {
   public:
    RemoveItems(Playlist* playlist, int pos, int count);

    int id() const { return Type_RemoveItems; }

    void undo();
    void redo();
    bool mergeWith(const QUndoCommand *other);

   private:
    struct Range {
      Range(int pos, int count) : pos_(pos), count_(count) {}
      int pos_;
      int count_;
      PlaylistItemList items_;
    };

    QList<Range> ranges_;
  };

  class MoveItems : public Base {
   public:
    MoveItems(Playlist* playlist, const QList<int>& source_rows, int pos);

    void undo();
    void redo();

   private:
    QList<int> source_rows_;
    int pos_;
  };

  class ReOrderItems : public Base {
   public:
    ReOrderItems(Playlist* playlist, const PlaylistItemList& new_items);

    void undo();
    void redo();

   private:
    PlaylistItemList old_items_;
    PlaylistItemList new_items_;
  };

  class SortItems : public ReOrderItems {
   public:
    SortItems(Playlist* playlist, int column, Qt::SortOrder order, 
              const PlaylistItemList& new_items);

   private:
    int column_;
    Qt::SortOrder order_;
  };
  
  class ShuffleItems : public ReOrderItems {
   public:
    ShuffleItems(Playlist* playlist, const PlaylistItemList& new_items);
  };
} //namespace

#endif // PLAYLISTUNDOCOMMANDS_H
