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/** @defgroup dnsdbzone Zone related functions
 *  @ingroup dnsdb
 *  @brief Internal functions for the database: zoned resource records label.
 *
 *  Internal functions for the database: zoned resource records label.
 *
 *  The ZONE LABEL is a label that can:
 *
 *  _ contains a zone cut
 *  _ contains a cached label
 *
 *  They should only be used as the top holding structure of the database
 *
 * @{
 */

#ifndef _ZONE_LABEL_H
#define	_ZONE_LABEL_H

#include <dnsdb/zdb_types.h>

#ifdef	__cplusplus
extern "C"
{
#endif

#define ZDB_ZONELABEL_TAG 0x4c424c4e5a42445a     /* "ZDBZNLBL" */

/**
 * @brief Search for the label of a zone in the database
 *
 * Search for the label of a zone in the database
 *
 * @param[in] db the database to explore
 * @param[in] name the dnsname_vector mapping the label
 * @param[in] zclass the class of the zone we are looking for
 *
 * @return a pointer to the label or NULL if it does not exists in the database.
 *
 */

/* 3 USES */
zdb_zone_label* zdb_zone_label_find(zdb* db, dnsname_vector* name, u16 zclass);

zdb_zone_label* zdb_zone_label_find_from_name(zdb* db, const char* name, u16 zclass);

zdb_zone_label* zdb_zone_label_find_from_dnsname(zdb* db, const u8* dns_name, u16 zclass);

zdb_zone_label* zdb_zone_label_find_from_dnsname_nolock(zdb* db, const u8* dns_name);

zdb_zone_label* zdb_zone_label_find_nolock(zdb * db, dnsname_vector* origin);
zdb_zone_label* zdb_zone_label_add_nolock(zdb * db, dnsname_vector* origin);

/**
 * @brief Destroys a label and its collections.
 *
 * Destroys a label and its collections.
 *
 * @param[in] zone_labelp a pointer to a pointer to the label to destroy.
 *
 */

/* 1 USE */
void zdb_zone_label_destroy(zdb_zone_label** zone_labelp);

/**
 * @brief Gets pointers to all the zone labels along the path of a name.
 *
 * Gets pointers to all the zone labels along the path of a name.
 *
 * @param[in] db a pointer to the database
 * @param[in] name a pointer to the dns name
 * @param[in] zclass the class we are looking for
 * @param[in] zone_label_vector a pointer to the vector that will hold the labels pointers
 *
 * @return the top of the vector (-1 = empty)
 */

/* 1 USE */
s32 zdb_zone_label_match(zdb* db, const dnsname_vector* name, u16 zclass, zdb_zone_label_pointer_array zone_label_vector);

/**
 * @brief Retrieve the zone label origin, adds it in the database if needed.
 *
 * Retrieve the zone label origin, adds it in the database if needed.
 *
 * @param[in] db a pointer to the database
 * @param[in] origin a pointer to the dns name
 * @param[in] zclass the class of the zone
 *
 * @return a pointer to the label
 */

/* 2 USES */
zdb_zone_label* zdb_zone_label_add(zdb* db, dnsname_vector* origin, u16 zclass);

/**
 * @brief Destroys a zone label and all its collections
 *
 * Destroys a zone label and all its collections
 *
 * @parm[in] db a pointer to the database
 * @parm[in] name a pointer to the name
 * @parm[in] zclass the class of the zone of the label
 *
 * @return an error code
 */

/* 2 USES */
ya_result zdb_zone_label_delete(zdb* db, dnsname_vector* name, u16 zclass);



#if 0 /* fix */
#else

/**
 * @brief TRUE if the zone_label contains information (records, zone or a set of labels), else FALSE
 */

/* 2 USES */
#define ZONE_LABEL_RELEVANT(zone_label) ((zone_label)->zone!=NULL||dictionary_notempty(&(zone_label)->sub))

/**
 * @brief FALSE if the zone_label contains information (records, zone or a set of labels), else TRUE
 */

/* 4 USES */
#define ZONE_LABEL_IRRELEVANT(zone_label) ((zone_label)->zone==NULL&&dictionary_isempty(&(zone_label)->sub))


#endif

#ifndef NDEBUG

/**
 * DEBUG: prints the label content
 */

void zdb_zone_label_print_indented(zdb_zone_label* zone_label, output_stream *os, int indent);
void zdb_zone_label_print(zdb_zone_label* zone_label, output_stream *os);

#endif

#ifdef	__cplusplus
}
#endif

#endif	/* _ZONE_LABEL_H */

/** @} */
