/**
 *  \defgroup Config Configuration Interface
 *  Configuration Interface
 *  \{
 */

/** Config node type */
typedef enum _snd_config_type {
	/** Integer number */
        SND_CONFIG_TYPE_INTEGER,
	/** Real number */
        SND_CONFIG_TYPE_REAL,
	/** Character string */
        SND_CONFIG_TYPE_STRING,
	/** Compound */
	SND_CONFIG_TYPE_COMPOUND,
} snd_config_type_t;

/** Config node handle */
typedef struct _snd_config snd_config_t;
/** Config compound iterator */
typedef struct _snd_config_iterator *snd_config_iterator_t;

#ifdef __cplusplus
extern "C" {
#endif

int snd_config_top(snd_config_t **config);

int snd_config_load(snd_config_t *config, snd_input_t *in);
int snd_config_save(snd_config_t *config, snd_output_t *out);

int snd_config_search(snd_config_t *config, const char *key,
		      snd_config_t **result);
int snd_config_searchv(snd_config_t *config, 
		       snd_config_t **result, ...);
int snd_config_search_alias(snd_config_t *config,
			    const char *base, const char *key,
			    snd_config_t **result);

int snd_config_expand(snd_config_t *config, const char *args,
		      void *private_data, snd_config_t **result);

int snd_config_add(snd_config_t *config, snd_config_t *leaf);
int snd_config_delete(snd_config_t *config);
int snd_config_copy(snd_config_t **dst, snd_config_t *src);

int snd_config_make(snd_config_t **config, const char *key,
		    snd_config_type_t type);
int snd_config_make_integer(snd_config_t **config, const char *key);
int snd_config_make_real(snd_config_t **config, const char *key);
int snd_config_make_string(snd_config_t **config, const char *key);
int snd_config_make_compound(snd_config_t **config, const char *key, int join);

int snd_config_set_id(snd_config_t *config, const char *id);
int snd_config_set_integer(snd_config_t *config, long value);
int snd_config_set_real(snd_config_t *config, double value);
int snd_config_set_string(snd_config_t *config, const char *value);
int snd_config_set_ascii(snd_config_t *config, const char *ascii);
int snd_config_get_integer(snd_config_t *config, long *value);
int snd_config_get_real(snd_config_t *config, double *value);
int snd_config_get_string(snd_config_t *config, const char **value);
int snd_config_get_ascii(snd_config_t *config, char **value);

snd_config_iterator_t snd_config_iterator_first(snd_config_t *node);
snd_config_iterator_t snd_config_iterator_next(snd_config_iterator_t iterator);
snd_config_iterator_t snd_config_iterator_end(snd_config_t *node);
snd_config_t *snd_config_iterator_entry(snd_config_iterator_t iterator);

/** Helper for compound config node leaves traversal
 * \param pos Current node iterator
 * \param next Next node iterator
 * \param node Compound config node
 *
 * This macro is designed to permit the removal of current node.
 */
#define snd_config_for_each(pos, next, node) \
	for (pos = snd_config_iterator_first(node), next = snd_config_iterator_next(pos); pos != snd_config_iterator_end(node); pos = next, next = snd_config_iterator_next(pos))

snd_config_type_t snd_config_get_type(snd_config_t *config);
const char *snd_config_get_id(snd_config_t *config);

extern snd_config_t *snd_config;
int snd_config_update(void);

/* Misc functions */

int snd_config_get_bool_ascii(const char *ascii);
int snd_config_get_bool(snd_config_t *conf);
int snd_config_get_ctl_iface_ascii(const char *ascii);
int snd_config_get_ctl_iface(snd_config_t *conf);

typedef int (snd_config_string_replace_callback_t)(const char *what, char **dst, void *private_data);

int snd_config_string_replace(const char *src, char idchr,
			      snd_config_string_replace_callback_t *callback,
			      void *private_data,
			      char **dst);
int snd_config_redirect_load(snd_config_t *root,
			     snd_config_t *config,
			     char **name,
			     snd_config_t **dst_config,
			     int *dst_dynamic);

#ifdef __cplusplus
}
#endif

/** \} */