/***

  Olive - Non-Linear Video Editor
  Copyright (C) 2022 Olive Team
  Modifications Copyright (C) 2025 mikesolar

  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 3 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, see <http://www.gnu.org/licenses/>.

***/

#ifndef OAK_UNDOSTACK_H
#define OAK_UNDOSTACK_H

#include <QAction>
#include <QAbstractItemModel>

#include "common/define.h"
#include "undo/undocommand.h"

namespace olive
{

class UndoStack : public QAbstractItemModel {
	Q_OBJECT
public:
	UndoStack();

	virtual ~UndoStack() override;

	void push(UndoCommand *command, const QString &name);

	void jump(size_t index);

	void clear();

	bool can_undo() const;

	bool can_redo() const
	{
		return !undone_commands_.empty();
	}

	void update_actions();

	QAction *GetUndoAction()
	{
		return undo_action_;
	}

	QAction *GetRedoAction()
	{
		return redo_action_;
	}

	virtual int
	columnCount(const QModelIndex &parent = QModelIndex()) const override;
	virtual QVariant data(const QModelIndex &index,
						  int role = Qt::DisplayRole) const override;
	virtual QModelIndex
	index(int row, int column,
		  const QModelIndex &parent = QModelIndex()) const override;
	virtual QModelIndex parent(const QModelIndex &index) const override;
	virtual int
	rowCount(const QModelIndex &parent = QModelIndex()) const override;
	virtual QVariant headerData(int section, Qt::Orientation orientation,
								int role = Qt::DisplayRole) const override;
	virtual bool
	hasChildren(const QModelIndex &parent = QModelIndex()) const override;

signals:
	void index_changed(int i);

public slots:
	void undo();

	void redo();

private:
	static const int k_max_undo_commands;

	struct CommandEntry {
		UndoCommand *command;
		QString name;
	};

	std::list<CommandEntry> commands_;

	std::list<CommandEntry> undone_commands_;

	QAction *undo_action_;

	QAction *redo_action_;
};

}

#endif // OAK_UNDOSTACK_H