#ifndef AUDIOEFFECTEQ_H
#define AUDIOEFFECTEQ_H

/*************************************************************************/
/*  audio_effect_eq.h                                                    */
/*************************************************************************/
/*                         This file is part of:                         */
/*                          PANDEMONIUM ENGINE                           */
/*             https://github.com/Relintai/pandemonium_engine            */
/*************************************************************************/
/* Copyright (c) 2022-present Péter Magyar.                              */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
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/* a copy of this software and associated documentation files (the       */
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/* distribute, sublicense, and/or sell copies of the Software, and to    */
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/* the following conditions:                                             */
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/* The above copyright notice and this permission notice shall be        */
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/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
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/*************************************************************************/

#include "servers/audio/audio_effect.h"
#include "servers/audio/effects/eq.h"

class AudioEffectEQ;

class AudioEffectEQInstance : public AudioEffectInstance {
	GDCLASS(AudioEffectEQInstance, AudioEffectInstance);
	friend class AudioEffectEQ;
	Ref<AudioEffectEQ> base;

	Vector<EQ::BandProcess> bands[2];
	Vector<float> gains;

public:
	virtual void process(const AudioFrame *p_src_frames, AudioFrame *p_dst_frames, int p_frame_count);
};

class AudioEffectEQ : public AudioEffect {
	GDCLASS(AudioEffectEQ, AudioEffect);

	friend class AudioEffectEQInstance;

	EQ eq;
	Vector<float> gain;
	RBMap<StringName, int> prop_band_map;
	Vector<String> band_names;

protected:
	bool _set(const StringName &p_name, const Variant &p_value);
	bool _get(const StringName &p_name, Variant &r_ret) const;
	void _get_property_list(List<PropertyInfo> *p_list) const;

	static void _bind_methods();

public:
	Ref<AudioEffectInstance> instance();
	void set_band_gain_db(int p_band, float p_volume);
	float get_band_gain_db(int p_band) const;
	int get_band_count() const;

	AudioEffectEQ(EQ::Preset p_preset = EQ::PRESET_6_BANDS);
};

class AudioEffectEQ6 : public AudioEffectEQ {
	GDCLASS(AudioEffectEQ6, AudioEffectEQ);

public:
	AudioEffectEQ6() :
			AudioEffectEQ(EQ::PRESET_6_BANDS) {}
};

class AudioEffectEQ10 : public AudioEffectEQ {
	GDCLASS(AudioEffectEQ10, AudioEffectEQ);

public:
	AudioEffectEQ10() :
			AudioEffectEQ(EQ::PRESET_10_BANDS) {}
};

class AudioEffectEQ21 : public AudioEffectEQ {
	GDCLASS(AudioEffectEQ21, AudioEffectEQ);

public:
	AudioEffectEQ21() :
			AudioEffectEQ(EQ::PRESET_21_BANDS) {}
};

#endif // AUDIOEFFECTEQ_H