/***

  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 BLOCK_H
#define BLOCK_H

#include "node/node.h"
#include "timeline/timelinecommon.h"

namespace olive
{

class TransitionBlock;

/**
 * @brief A Node that represents a block of time, also displayable on a Timeline
 */
class Block : public Node {
	Q_OBJECT
public:
	Block();

	virtual QVector<CategoryID> Category() const override;

	const rational &in() const
	{
		return in_point_;
	}

	const rational &out() const
	{
		return out_point_;
	}

	void set_in(const rational &in)
	{
		in_point_ = in;
	}

	void set_out(const rational &out)
	{
		out_point_ = out;
	}

	rational length() const;
	virtual void set_length_and_media_out(const rational &length);
	virtual void set_length_and_media_in(const rational &length);

	TimeRange range() const
	{
		return TimeRange(in(), out());
	}

	Block *previous() const
	{
		return previous_;
	}

	Block *next() const
	{
		return next_;
	}

	void set_previous(Block *previous)
	{
		previous_ = previous;
	}

	void set_next(Block *next)
	{
		next_ = next;
	}

	Track *track() const
	{
		return track_;
	}

	void set_track(Track *track)
	{
		track_ = track;
		emit TrackChanged(track_);
	}

	bool is_enabled() const;
	void set_enabled(bool e);

	virtual void Retranslate() override;

	virtual void InvalidateCache(
		const TimeRange &range, const QString &from, int element = -1,
		InvalidateCacheOptions options = InvalidateCacheOptions()) override;

	static const QString kLengthInput;

	static void set_previous_next(Block *previous, Block *next);

public slots:

signals:
	void EnabledChanged();

	void LengthChanged();

	void PreviewChanged();

	void TrackChanged(Track *track);

protected:
	virtual void InputValueChangedEvent(const QString &input,
										int element) override;

	Block *previous_;
	Block *next_;

private:
	void set_length_internal(const rational &length);

	rational in_point_;
	rational out_point_;
	Track *track_;

	rational last_length_;
};

}

#endif // BLOCK_H
