#ifndef SYNTH_H
#define SYNTH_H

#include <stdint.h>

#define VOICE_COUNT 16

typedef enum {
    WAVE_SINE,
    WAVE_TRIANGLE,
    WAVE_SAW,
    WAVE_RAMP,
    WAVE_PULSE,
    WAVE_NOISE,
    WAVE_COUNT  // handy for the modulo wrap on waveform switching
} Waveform;

typedef struct {
    float phase;
    float freqHz;
    float amp;
    float targetAmp;
    int   active;
    int   midiNote;
} Voice;

typedef struct {
    float    sampleRate;
    float    attackSec;
    float    releaseSec;
    float    dutyCycle;
    Waveform waveform;
    Voice    voices[VOICE_COUNT];
    int      lastStolenVoice;
    float pitchBend;       // -1.0 to +1.0, normalized from raw MIDI value
    float pitchBendRange;  // semitones, e.g. 2.0f
} Synth;

void  synthInit(Synth *s, float sampleRate);
void  synthNoteOn(Synth *s, int midiNote);
void  synthNoteOff(Synth *s, int midiNote);
void  synthFillBuffer(Synth *s, int16_t *out, int frames);
float waveformSample(Waveform w, float phase, float dutyCycle);
const char *waveformName(Waveform w);

#endif