/*
 * Hydrogen
 * Copyright(c) 2002-2008 by Alex >Comix< Cominu [comix@users.sourceforge.net]
 * Copyright(c) 2008-2021 The hydrogen development team [hydrogen-devel@lists.sourceforge.net]
 *
 * http://www.hydrogen-music.org
 *
 * 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. If not, see https://www.gnu.org/licenses
 *
 */

#ifndef H2C_INSTRUMENT_LAYER_H
#define H2C_INSTRUMENT_LAYER_H

#include <memory>
#include <core/Object.h>

namespace H2Core
{

	class XMLNode;
	class Sample;

	/**
	 * InstrumentLayer is part of an instrument
	 * <br>each layer has it's own :
	 * <br><b>gain</b> which is the ration between the input sample and the output signal,
	 * <br><b>pitch</b> which allows you to play the sample at a faster or lower frequency,
	 * <br><b>start velocity</b> and <b>end velocity</b> which allows you to chose between a layer or another within an instrument
	 * by changing the velocity of the played note. so the only layer of an instrument should start at 0.0 and end at 1.0.
	 */
	class InstrumentLayer : public H2Core::Object
	{
		H2_OBJECT
		public:
		/** constructor
		 * \param sample the sample to use
		 * */
		InstrumentLayer( std::shared_ptr<Sample> sample );
		/** copy constructor, will be initialized with an empty sample
		 * \param other the instrument layer to copy from
		 */
		InstrumentLayer( InstrumentLayer* other );
		/** copy constructor
		 * \param other the instrument layer to copy from
		 * \param sample the sample to use
		 */
		InstrumentLayer( InstrumentLayer* other, std::shared_ptr<Sample> sample );
		/** destructor */
		~InstrumentLayer();

		/** set the gain of the layer */
		void set_gain( float gain );
		/** get the gain of the layer */
		float get_gain() const;
		/** set the pitch of the layer */
		void set_pitch( float pitch );
		/** get the pitch of the layer */
		float get_pitch() const;

		/** set the start ivelocity of the layer */
		void set_start_velocity( float start );
		/** get the start velocity of the layer */
		float get_start_velocity() const;
		/** set the end velocity of the layer */
		void set_end_velocity( float end );
		/** get the end velocity of the layer */
		float get_end_velocity() const;
		/** set the sample of the layer */
		void set_sample( std::shared_ptr<Sample> sample );
		/** get the sample of the layer */
		std::shared_ptr<Sample> get_sample() const;

		/**
		 * Calls the #H2Core::Sample::load()
		 * member function of #__sample.
		 */
		void load_sample();
		/*
		 * unload sample and replace it with an empty one
		 */
		void unload_sample();

		/**
		 * save the instrument layer within the given XMLNode
		 * \param node the XMLNode to feed
		 */
		void save_to( XMLNode* node );
		/**
		 * load an instrument layer from an XMLNode
		 * \param node the XMLDode to read from
		 * \param dk_path the directory holding the drumkit data
		 * \return a new InstrumentLayer instance
		 */
		static InstrumentLayer* load_from( XMLNode* node, const QString& dk_path );
		/** Formatted string version for debugging purposes.
		 * \param sPrefix String prefix which will be added in front of
		 * every new line
		 * \param bShort Instead of the whole content of all classes
		 * stored as members just a single unique identifier will be
		 * displayed without line breaks.
		 *
		 * \return String presentation of current object.*/
		QString toQString( const QString& sPrefix, bool bShort = true ) const override;

	private:
		float __gain;               ///< ratio between the input sample and the output signal, 1.0 by default
		float __pitch;              ///< the frequency of the sample, 0.0 by default which means output pitch is the same as input pitch
		float __start_velocity;     ///< the start velocity of the sample, 0.0 by default
		float __end_velocity;       ///< the end velocity of the sample, 1.0 by default
		std::shared_ptr<Sample> __sample;           ///< the underlaying sample
	};

	// DEFINITIONS

	inline void InstrumentLayer::set_gain( float gain )
	{
		__gain = gain;
	}

	inline float InstrumentLayer::get_gain() const
	{
		return __gain;
	}

	inline void InstrumentLayer::set_pitch( float pitch )
	{
		__pitch = pitch;
	}

	inline float InstrumentLayer::get_pitch() const
	{
		return __pitch;
	}

	inline void InstrumentLayer::set_start_velocity( float start )
	{
		__start_velocity = start;
	}

	inline float InstrumentLayer::get_start_velocity() const
	{
		return __start_velocity;
	}

	inline void InstrumentLayer::set_end_velocity( float end )
	{
		__end_velocity = end;
	}

	inline float InstrumentLayer::get_end_velocity() const
	{
		return __end_velocity;
	}

	inline std::shared_ptr<Sample> InstrumentLayer::get_sample() const
	{
		return __sample;
	}

};

#endif // H2C_INSTRUMENT_LAYER_H

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