#ifndef AUDIOEFFECTCHORUS_H
#define AUDIOEFFECTCHORUS_H


#include "servers/audio/audio_effect.h"

class AudioEffectChorus;

class AudioEffectChorusInstance : public AudioEffectInstance {
	GDCLASS(AudioEffectChorusInstance,AudioEffectInstance)
friend class AudioEffectChorus;
	Ref<AudioEffectChorus> base;

	Vector<AudioFrame> audio_buffer;
	unsigned int buffer_pos;
	unsigned int buffer_mask;

	AudioFrame filter_h[4];
	uint64_t cycles[4];

	void _process_chunk(const AudioFrame *p_src_frames,AudioFrame *p_dst_frames,int p_frame_count);

public:

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

};


class AudioEffectChorus : public AudioEffect {
	GDCLASS(AudioEffectChorus,AudioEffect)

friend class AudioEffectChorusInstance;
public:
	enum {

		MAX_DELAY_MS=50,
		MAX_DEPTH_MS=20,
		MAX_WIDTH_MS=50,
		MAX_VOICES=4,
		CYCLES_FRAC=16,
		CYCLES_MASK=(1<<CYCLES_FRAC)-1,
		MAX_CHANNELS=4,
		MS_CUTOFF_MAX=16000
	};

private:

	struct Voice {

		float delay;
		float rate;
		float depth;
		float level;
		float cutoff;
		float pan;

		Voice() {

			delay=12.0;
			rate=1;
			depth=0;
			level=0;
			cutoff=MS_CUTOFF_MAX;
			pan=0;

		}

	} voice[MAX_VOICES];

	int voice_count;

	float wet;
	float dry;


protected:
	void _validate_property(PropertyInfo& property) const;

	static void _bind_methods();
public:

	void set_voice_count(int p_voices);
	int get_voice_count() const;

	void set_voice_delay_ms(int p_voice,float p_delay_ms);
	float get_voice_delay_ms(int p_voice) const;

	void set_voice_rate_hz(int p_voice,float p_rate_hz);
	float get_voice_rate_hz(int p_voice) const;

	void set_voice_depth_ms(int p_voice,float p_depth_ms);
	float get_voice_depth_ms(int p_voice) const;

	void set_voice_level_db(int p_voice,float p_level_db);
	float get_voice_level_db(int p_voice) const;

	void set_voice_cutoff_hz(int p_voice,float p_cutoff_hz);
	float get_voice_cutoff_hz(int p_voice) const;

	void set_voice_pan(int p_voice,float p_pan);
	float get_voice_pan(int p_voice) const;

	void set_wet(float amount);
	float get_wet() const;

	void set_dry(float amount);
	float get_dry() const;

	Ref<AudioEffectInstance> instance();

	AudioEffectChorus();
};

#endif // AUDIOEFFECTCHORUS_H