#ifndef AUDIO_EFFECT_SPECTRUM_ANALYZER_H
#define AUDIO_EFFECT_SPECTRUM_ANALYZER_H

/*************************************************************************/
/*  audio_effect_spectrum_analyzer.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.                 */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/

#include "servers/audio/audio_effect.h"

class AudioEffectSpectrumAnalyzer;

class AudioEffectSpectrumAnalyzerInstance : public AudioEffectInstance {
	GDCLASS(AudioEffectSpectrumAnalyzerInstance, AudioEffectInstance);

public:
	enum MagnitudeMode {
		MAGNITUDE_AVERAGE,
		MAGNITUDE_MAX,
	};

private:
	friend class AudioEffectSpectrumAnalyzer;
	Ref<AudioEffectSpectrumAnalyzer> base;

	Vector<Vector<AudioFrame>> fft_history;
	Vector<float> temporal_fft;
	int temporal_fft_pos;
	int fft_size;
	int fft_count;
	int fft_pos;
	float mix_rate;
	uint64_t last_fft_time;

protected:
	static void _bind_methods();

public:
	virtual void process(const AudioFrame *p_src_frames, AudioFrame *p_dst_frames, int p_frame_count);
	Vector2 get_magnitude_for_frequency_range(float p_begin, float p_end, MagnitudeMode p_mode = MAGNITUDE_MAX) const;
};

VARIANT_ENUM_CAST(AudioEffectSpectrumAnalyzerInstance::MagnitudeMode)

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

public:
	enum FFT_Size {
		FFT_SIZE_256,
		FFT_SIZE_512,
		FFT_SIZE_1024,
		FFT_SIZE_2048,
		FFT_SIZE_4096,
		FFT_SIZE_MAX
	};

public:
	friend class AudioEffectSpectrumAnalyzerInstance;
	float buffer_length;
	float tapback_pos;
	FFT_Size fft_size;

protected:
	static void _bind_methods();

public:
	Ref<AudioEffectInstance> instance();
	void set_buffer_length(float p_seconds);
	float get_buffer_length() const;
	void set_tap_back_pos(float p_seconds);
	float get_tap_back_pos() const;

	void set_fft_size(FFT_Size);
	FFT_Size get_fft_size() const;

	AudioEffectSpectrumAnalyzer();
};

VARIANT_ENUM_CAST(AudioEffectSpectrumAnalyzer::FFT_Size);

#endif // AUDIO_EFFECT_SPECTRUM_ANALYZER_H