// ampler.h

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <SDL2/SDL.h>


typedef int8_t s8;
typedef int16_t s16;
typedef int32_t s32;

typedef uint8_t u8;
typedef uint16_t u16;
typedef uint32_t u32;
typedef uint64_t u64;

typedef float f32;
typedef double f64;


#define if if(
#define while while(
#define for for(
#define do )

#define or ||
#define and &&


#define arraylen(a) (sizeof (a) / sizeof ((a)[0]))

#define foreach_ptr(TYPE, N, ARRAY) \
for int N##_i = 0; N##_i == 0; N##_i = 1 do \
for TYPE *N = &((ARRAY)[N##_i]); N != NULL; N = NULL do \
for ; N##_i < arraylen(ARRAY); N##_i += 1, N = &((ARRAY)[N##_i]) do

#define MIN(a, b) ((a) < (b) ? (a) : (b))

#define SAMPLE_RATE (44100)
#define CHANNELS (2)
#define FRAME_SAMPLES (SAMPLE_RATE / 60)

typedef struct Sound_src Sound_src;
struct Sound_src {
	s8 *tracks[CHANNELS];
	s32 track_len; // size of track buffers, in samples
	f32 pos; // position in samples
	f32 speed; // in samples, per sample, can be negative
	s32 start; // play start in samples
	s32 end; // play end in samples
	s8 name[32]; // includes null terminator
	f32 note_speed; // multiplies with base speed, CANNOT be negative
	enum { SND_FREE = 0, SND_STOPPED, SND_PLAYING, SND_LOOPING, } state;
};

typedef struct Udp_msg Udp_msg;
struct Udp_msg {
	s8 text[32]; // includes null terminator
	enum { MSG_FREE = 0, MSG_TRIGGER, } state;
};

typedef struct Markov_4 Markov_4;
struct Markov_4 {
	u8 start;
	u8 chain[256][256];
	u8 lens[256];
};

typedef struct Ampler_state Ampler_state;
struct Ampler_state {
	u32 size; // in bytes, off this struct
	SDL_AudioDeviceID playdev;
	SDL_AudioDeviceID recdev;
	Sound_src sounds[64];
	s32 played_audio_last_frame;
	Udp_msg messages[64];
	s8 frame_mix[CHANNELS][FRAME_SAMPLES];
	s8 frame_rec[CHANNELS][FRAME_SAMPLES];

	Markov_4 markov;
};


void udp_init(Ampler_state *);
void udp_frame(Ampler_state *);
void udp_quit(Ampler_state *);