/*
 * AudioFileProcessor.h - declaration of class AudioFileProcessor
 *                          (instrument-plugin for using audio-files)
 *
 * Copyright (c) 2004-2014 Tobias Doerffel <tobydox/at/users.sourceforge.net>
 *
 * This file is part of LMMS - https://lmms.io
 *
 * 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 2 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 (see COPYING); if not, write to the
 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA 02110-1301 USA.
 *
 */


#ifndef AUDIO_FILE_PROCESSOR_H
#define AUDIO_FILE_PROCESSOR_H

#include <QPixmap>

#include "ComboBoxModel.h"
#include "Instrument.h"
#include "InstrumentView.h"
#include "SampleBuffer.h"
#include "Knob.h"


namespace lmms
{

namespace gui
{
class automatableButtonGroup;
class PluginView;
class InstrumentViewFixedSize;
class Knob;
class PixmapButton;
class ComboBox;
class AudioFileProcessorView;
}


class AudioFileProcessor : public Instrument
{
	Q_OBJECT
public:
	AudioFileProcessor( InstrumentTrack * _instrument_track );

	void playNote( NotePlayHandle * _n,
						sampleFrame * _working_buffer ) override;
	void deleteNotePluginData( NotePlayHandle * _n ) override;

	void saveSettings( QDomDocument & _doc,
						QDomElement & _parent ) override;
	void loadSettings( const QDomElement & _this ) override;

	void loadFile( const QString & _file ) override;

	QString nodeName() const override;

	virtual int getBeatLen( NotePlayHandle * _n ) const;

	f_cnt_t desiredReleaseFrames() const override
	{
		return 128;
	}

	gui::PluginView* instantiateView( QWidget * _parent ) override;


public slots:
	void setAudioFile( const QString & _audio_file, bool _rename = true );


private slots:
	void reverseModelChanged();
	void ampModelChanged();
	void loopPointChanged();
	void startPointChanged();
	void endPointChanged();
	void pointChanged();
	void stutterModelChanged();


signals:
	void isPlaying( lmms::f_cnt_t _current_frame );


private:
	using handleState = SampleBuffer::handleState;

	SampleBuffer m_sampleBuffer;

	FloatModel m_ampModel;
	FloatModel m_startPointModel;
	FloatModel m_endPointModel;
	FloatModel m_loopPointModel;
	BoolModel m_reverseModel;
	IntModel m_loopModel;
	BoolModel m_stutterModel;
	ComboBoxModel m_interpolationModel;

	f_cnt_t m_nextPlayStartPoint;
	bool m_nextPlayBackwards;

	friend class gui::AudioFileProcessorView;

} ;


namespace gui
{

class AudioFileProcessorWaveView;


class AudioFileProcessorView : public gui::InstrumentViewFixedSize
{
	Q_OBJECT
public:
	AudioFileProcessorView( Instrument * _instrument, QWidget * _parent );
	virtual ~AudioFileProcessorView() = default;

	void newWaveView();
protected slots:
	void sampleUpdated();
	void openAudioFile();


protected:
	virtual void dragEnterEvent( QDragEnterEvent * _dee );
	virtual void dropEvent( QDropEvent * _de );
	virtual void paintEvent( QPaintEvent * );


private:
	virtual void modelChanged();

	static QPixmap * s_artwork;

	AudioFileProcessorWaveView * m_waveView;
	Knob * m_ampKnob;
	Knob * m_startKnob;
	Knob * m_endKnob;
	Knob * m_loopKnob;

	gui::PixmapButton * m_openAudioFileButton;
	PixmapButton * m_reverseButton;
	automatableButtonGroup * m_loopGroup;
	PixmapButton * m_stutterButton;
	ComboBox * m_interpBox;

} ;



class AudioFileProcessorWaveView : public QWidget
{
	Q_OBJECT
protected:
	virtual void enterEvent( QEvent * _e );
	virtual void leaveEvent( QEvent * _e );
	virtual void mousePressEvent( QMouseEvent * _me );
	virtual void mouseReleaseEvent( QMouseEvent * _me );
	virtual void mouseMoveEvent( QMouseEvent * _me );
	virtual void wheelEvent( QWheelEvent * _we );
	virtual void paintEvent( QPaintEvent * _pe );


public:
	enum knobType
	{
		start,
		end,
		loop
	} ;

	class knob : public Knob
	{
		const AudioFileProcessorWaveView * m_waveView;
		const Knob * m_relatedKnob;


	public:
		knob( QWidget * _parent ) :
			Knob( knobBright_26, _parent ),
			m_waveView( 0 ),
			m_relatedKnob( 0 )
		{
			setFixedSize( 37, 47 );
		}

		void setWaveView( const AudioFileProcessorWaveView * _wv )
		{
			m_waveView = _wv;
		}

		void setRelatedKnob( const Knob * _knob )
		{
			m_relatedKnob = _knob;
		}

		void slideBy( double _v, bool _check_bound = true )
		{
			slideTo( model()->value() + _v, _check_bound );
		}

		void slideTo( double _v, bool _check_bound = true );


	protected:
		float getValue( const QPoint & _p );


	private:
		bool checkBound( double _v ) const;
	} ;


public slots:
	void update()
	{
		updateGraph();
		QWidget::update();
	}

	void isPlaying( lmms::f_cnt_t _current_frame );


private:
	static const int s_padding = 2;

	enum draggingType
	{
		wave,
		sample_start,
		sample_end,
		sample_loop
	} ;

	SampleBuffer& m_sampleBuffer;
	QPixmap m_graph;
	f_cnt_t m_from;
	f_cnt_t m_to;
	f_cnt_t m_last_from;
	f_cnt_t m_last_to;
	float m_last_amp;
	knob * m_startKnob;
	knob * m_endKnob;
	knob * m_loopKnob;
	f_cnt_t m_startFrameX;
	f_cnt_t m_endFrameX;
	f_cnt_t m_loopFrameX;
	bool m_isDragging;
	QPoint m_draggingLastPoint;
	draggingType m_draggingType;
	bool m_reversed;
	f_cnt_t m_framesPlayed;
	bool m_animation;

public:
	AudioFileProcessorWaveView( QWidget * _parent, int _w, int _h, SampleBuffer& buf );
	void setKnobs(knob *_start, knob *_end, knob *_loop );


	void updateSampleRange();
private:
	void zoom( const bool _out = false );
	void slide( int _px );
	void slideSamplePointByPx( knobType _point, int _px );
	void slideSamplePointByFrames( knobType _point, f_cnt_t _frames, bool _slide_to = false );
	void slideSampleByFrames( f_cnt_t _frames );

	void slideSamplePointToFrames( knobType _point, f_cnt_t _frames )
	{
		slideSamplePointByFrames( _point, _frames, true );
	}

	void updateGraph();
	void reverse();
	void updateCursor( QMouseEvent * _me = nullptr );

	static bool isCloseTo( int _a, int _b )
	{
		return qAbs( _a - _b ) < 4;
	}

} ;


} // namespace gui

} // namespace lmms

#endif