#ifndef CHANNEL_H
#define CHANNEL_H

// cppcheck-suppress missingIncludeSystem
#include <jack/jack.h>
#include <stdatomic.h>

#define MAX_SCENES 8
#define LOOP_BUF_SIZE  (5 * 48000)
#define MAX_MIDI_EVENTS 1024
#define MAX_CHANNELS   16

#include "ringbuffer.h"

typedef enum { CHANNEL_AUDIO, CHANNEL_MIDI } channel_type_t;

typedef enum {
    STATE_IDLE,
    STATE_RECORD,
    STATE_LOOPING,
    STATE_PAUSED
} looper_state;

/* Structure for a recorded or playing MIDI event */
typedef struct {
    jack_nframes_t timestamp;
    unsigned char status;
    unsigned char note;
    unsigned char velocity;
} midi_event_t;

/* Loop data for a scene */
typedef struct {
    float          audio_buffer[LOOP_BUF_SIZE];
    midi_event_t   midi_events[MAX_MIDI_EVENTS];
} loop_data_t;

/* A single scene within a channel */
typedef struct {
    atomic_int state;
    atomic_int prev_state;
    atomic_int loop_count;
    atomic_int record_pos;
    atomic_int playback_pos;
    loop_data_t loop;
} scene_t;

struct channel_t {
    channel_type_t type;          /* AUDIO or MIDI */
    atomic_int    active;
    jack_port_t  *audio_in;
    jack_port_t  *audio_out;
    jack_port_t  *midi_in;       /* NULL for audio channels */
    jack_port_t  *midi_out;
    int           scene_count;   /* number of scenes (max MAX_SCENES) */
    int           current_scene; /* index of currently active scene */
    scene_t       scenes[MAX_SCENES];

    _Atomic RingBuf *save_ring;
    atomic_int       save_complete;   /* 1 when writer is done; RT thread must stop writing */
};

/* Globals declared in looper.c */
extern struct channel_t channels[MAX_CHANNELS];
extern atomic_int  channel_count;
extern atomic_int  channel_capacity;
extern int         next_channel_id;
extern atomic_int  cmd_add;
extern atomic_int  cmd_remove;
extern atomic_int  cmd_load;
extern atomic_int  cmd_save;

void init_scene(scene_t *sc);
void channel_add(jack_client_t *client, int idx);
void channel_remove(jack_client_t *client, int idx);
void channel_add_scene(jack_client_t *client, int idx);
void channel_remove_scene(jack_client_t *client, int idx);
void channel_next_scene(jack_client_t *client, int idx);
void channel_prev_scene(jack_client_t *client, int idx);

#endif