// Spotify Connect (cspot). Project code; GPL-3.0 through cspot.
#pragma once

#include <stddef.h>
#include <stdint.h>

#include "esp_err.h"

#ifdef __cplusplus
extern "C" {
#endif

typedef enum {
    SPOTIFY_EV_PLAY,        // playback (re)started or resumed
    SPOTIFY_EV_PAUSE,
    SPOTIFY_EV_FLUSH,       // skip, seek, new track: drop buffered audio
    SPOTIFY_EV_VOLUME,      // value: 0..65535
} spotify_event_t;

// PCM from Spotify: 44.1 kHz stereo s16 interleaved. Return the frames taken (may block).
typedef size_t (*spotify_pcm_cb_t)(const int16_t *pcm, size_t frames);
typedef void (*spotify_event_cb_t)(spotify_event_t ev, int value);

// Registers the zeroconf endpoints (/spotify_info) and, when source.mode is spotify/auto and the
// client credentials are set, advertises the device and starts the session task.
esp_err_t spotify_init(spotify_pcm_cb_t pcm, spotify_event_cb_t event);
// Current state for status.spotify_state.
const char *spotify_state(void);

#ifdef __cplusplus
}
#endif