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

#include <stdbool.h>
#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), starts the session task and applies the config.
esp_err_t spotify_init(spotify_pcm_cb_t pcm, spotify_event_cb_t event);
// Re-read the "source" config: enabled (advertised, sessions accepted) when mode is spotify/auto and
// the client credentials are set; otherwise not advertised and a running session is ended.
// A new device name ends the session and re-advertises.
void spotify_apply(void);
// Pause/resume the running session (the Spotify app follows). No-op without a session.
void spotify_pause(bool pause);
// Suspend: end any running session (waits until its tasks are gone, max ~3 s) and refuse new ones.
// Resume: back to what the config says. Used around firmware uploads.
void spotify_suspend(bool suspend);
// The player's volume (0..100 %): reported to the Spotify app when a session starts (else the app
// shows 0 while we play at the player's level), and pushed to a running session.
void spotify_set_volume(int pct);
// Current state for status.spotify_state.
const char *spotify_state(void);

#ifdef __cplusplus
}
#endif