//
// Created by bruno on 13. 7. 2026.
//

#ifndef AUDIOCODER_ENCODER_H
#define AUDIOCODER_ENCODER_H

#define SAMPLE_RATE 48000
#define MAX_BITS 16
#define CLOCK_VOICE MAX_BITS
#define MAX_PACKET 223

#include <SDL_audio.h>
#include <stdint.h>

typedef struct SynthVoice {
    uint32_t phase;
    uint32_t phaseStep;
    uint16_t frequency;
    uint8_t volume;
} SynthVoice;

typedef enum {
    TX_IDLE,
    TX_PREAMBLE,
    TX_SYNC,
    TX_DATA,
    TX_END
} TxState;


typedef struct {

    unsigned int bitCount;

    unsigned int byteIndex;
    unsigned int bitIndex;
    uint8_t buffer[1024 * 1024 * 8];
    unsigned int bufferSize;



    uint16_t startFreq;
    uint16_t endFreq;
    uint16_t dataSpacing;


    uint16_t clock0;
    uint16_t clock1;

    bool clockState;


    uint32_t symbolSamples;
    uint32_t samplesRemaining;


    TxState state;
    uint32_t preambleSymbols;
    uint32_t syncIndex;

    bool transmitting;


} Encoder;


typedef struct AudioData {
    SynthVoice synthVoices[MAX_BITS + 1];
    Encoder *encoder;
} AudioData;

extern Encoder encoder;
extern AudioData encodedAudioData;
extern SDL_AudioDeviceID dev;

// Internal audio bus for loopback - simple ring buffer
#define INTERNAL_BUFFER_SIZE 262144
extern float internalBusSamples[INTERNAL_BUFFER_SIZE];
extern volatile uint32_t internalBusWrite;
extern volatile uint32_t internalBusRead;

void startEncoder(Encoder *enc);

void stopEncoder(Encoder *enc);

void initAudioEncoder();

extern const uint8_t syncBytes[4];

#endif //AUDIOCODER_ENCODER_H