#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>  //Header file for sleep(). man 3 sleep for details.
#include <errno.h>
 
#include <pthread.h>
#include <sys/socket.h>
#include <sys/un.h>


/* Flags for the info decoder function. */
enum tags_select
{
  TAGS_COMMENTS	= 0x01, /* artist, title, etc. */
  TAGS_TIME	= 0x02 /* time of the file. */
};

enum moc_state {
  STOPPED,
  PLAYING,
  PAUSED
};

enum moc_status {
  INITIALIZING,
  CONNECTED,
  FAILED_TO_CONNECT,
  ERROR,
  RECONNECTING
};

/* One entry in the server's playlist or queue. A singly-linked list hangs
 * off struct moc's playlist/queue fields. */
struct moc_plist_item {
  char *file;
  char *title;
  char *artist;
  char *album;
  int track;
  int time;
  struct moc_plist_item *next;
};

struct moc {
  pthread_mutex_t lock;
  enum moc_status status;
  enum moc_state state;

  char *filename;
  char *title;
  char *album;
  char *artist;
  int track;
  int time;
  int filled;
  int length;

  struct moc_plist_item *playlist;
  struct moc_plist_item *queue;

  /* The background thread owns the actual reads; sock/sock_lock let any
   * other thread send commands without racing/interleaving with it or with
   * the background thread's own internal requests. */
  int sock;
  pthread_mutex_t sock_lock;
};

extern const char * moc_str_status(enum moc_status s);
extern const char * moc_str_state(enum moc_state s);
extern struct moc * moc_init();

/* Commands a UI can call from any thread to control playback or modify the
 * playlist. Safe to call concurrently with each other and with the
 * background thread; each is a single atomic request to the server. */
extern void moc_play(struct moc *mh, const char *file);
extern void moc_pause(struct moc *mh);
extern void moc_unpause(struct moc *mh);
extern void moc_stop(struct moc *mh);
extern void moc_next(struct moc *mh);
extern void moc_prev(struct moc *mh);
extern void moc_playlist_add(struct moc *mh, const char *file);
extern void moc_playlist_remove(struct moc *mh, const char *file);
extern void moc_playlist_clear(struct moc *mh);