#ifndef CALLBACK_H_
#define CALLBACK_H_
 
#define _XOPEN_SOURCE
#include <time.h>
#include <glib.h>
//#define _XOPEN_SOURCE //glibc2 needs this
 
enum error_codes
{
	INVALID_SERVICE       = 2,
    INVALID_METHOD        = 3,
    AUTHENTICATION_FAILED = 4,
    INVALID_FORMAT        = 5,
    INVALID_PARAMETERS    = 6,
    INVALID_RESSOURCE     = 7,
    INVALID_SESSION       = 9,
    INVALID_API           = 10,
    SERVICE_OFFLINE       = 11,
    SUBSCRIBERS_ONLY      = 12
};
 
//should GError be not NULL you have to take care of it
//and finally call g_error_free it
 
//in the case of an error it is guaranteed that the
//data passed to the callback does not have to be freed
 
//one element callbacks - called only once
typedef void (*void_callback)(gpointer user_data, GError* error);
typedef void (*utf8_callback)(const gchar* utf8, gpointer user_data, GError* error);
typedef void (*url_callback)(const gchar* url, gpointer user_data, GError* error);
typedef void (*uint_callback)(guint digit, gpointer user_data, GError* error);
typedef void (*boolean_callback)(gboolean istrue, gpointer user_data, GError* error);
typedef void (*date_time_callback)(struct tm, gpointer user_data, GError* error);
 
//mutliple element callbacks
//terminated by call with is_end == TRUE
typedef void (*multi_utf8_callback)(const gchar* artist_name, gpointer user_data, GError* error, gboolean is_end);
typedef multi_utf8_callback artists_callback;
typedef multi_utf8_callback tags_callback;
typedef multi_utf8_callback tracks_callback;
typedef multi_utf8_callback albums_callback;
typedef multi_utf8_callback events_callback;
typedef multi_utf8_callback users_callback;
 
#endif /*CALLBACK_H_*/