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/** @defgroup dnsdbzone Zone related functions
 *  @ingroup dnsdb
 *  @brief Functions used to manipulate a zone
 *
 *  Functions used to manipulate a zone
 *
 * @{
 */

#pragma once

#include <dnsdb/zdb_types.h>
#include <dnsdb/dnsrdata.h>
#include <dnscore/input_stream.h>
#include <dnscore/output_stream.h>

/**
 * 
 * Locks the database
 * Gets the zone
 * Starts locking the zone for the owner
 * Increment the zone RC
 * Unlocks the database
 * Resume locking the zone for the owner
 * returns the locked zone
 * 
 * The read series implies no changes will be done to the database structure (no zone labels added/removed)
 * The write series implies changes will be done to the database structure.  Most likely a removal of a zone label.
 * 
 * @param db
 * @param fqdn/exact_match_origin
 * @param owner
 * @return 
 */

zdb_zone *zdb_acquire_zone_read(zdb *db, dnsname_vector *exact_match_origin);
zdb_zone *zdb_acquire_zone_read_from_fqdn(zdb *db, const u8 *fqdn);

zdb_zone *zdb_acquire_zone_read_trylock(zdb *db, dnsname_vector *exact_match_origin, u8 owner);
zdb_zone *zdb_acquire_zone_read_trylock_from_name(zdb *db, const char *name, u8 owner);
zdb_zone *zdb_acquire_zone_read_trylock_from_fqdn(zdb *db, const u8 *fqdn, u8 owner);

zdb_zone *zdb_acquire_zone_read_lock(zdb *db, dnsname_vector *exact_match_origin, u8 owner);
zdb_zone *zdb_acquire_zone_read_lock_from_name(zdb *db, const char *name, u8 owner);
zdb_zone *zdb_acquire_zone_read_lock_from_fqdn(zdb *db, const u8 *fqdn, u8 owner);

zdb_zone *zdb_acquire_zone_write_lock(zdb *db, dnsname_vector *exact_match_origin, u8 owner);
zdb_zone *zdb_acquire_zone_write_lock_from_name(zdb *db, const char *name, u8 owner);
zdb_zone *zdb_acquire_zone_write_lock_from_fqdn(zdb *db, const u8 *fqdn, u8 owner);

/**
 * The double lock allows the caller to lock a zone for an owner with dibs to change the owner.
 * Typically: lock for the simple reader and then change the lock to a writer.
 * This is useful when lock-out the readers is not needed yet, but will most likely be in the near future.
 * 
 * ie: lock reader + dynupdate
 *     verify prerequisites
 *     do the dry run
 *     transfer lock to dynupdate
 *     do the actual update
 *     unlock
 * 
 * @param db
 * @param exact_match_origin
 * @param owner
 * @param nextowner
 * @return 
 */

zdb_zone *zdb_acquire_zone_read_double_lock(zdb *db, dnsname_vector *exact_match_origin, u8 owner, u8 nextowner);
zdb_zone *zdb_acquire_zone_read_double_lock_from_name(zdb *db, const char *name, u8 owner, u8 nextowner);
zdb_zone *zdb_acquire_zone_read_double_lock_from_fqdn(zdb *db, const u8 *fqdn, u8 owner, u8 nextowner);

/**
 * 
 * Dereference and unlocks the zone.
 * If the RC reached 0, enqueues it for destruction
 * 
 * @param zone
 * @param owner
 */

void zdb_zone_acquire(zdb_zone *zone);

void zdb_zone_release(zdb_zone *zone);

void zdb_zone_release_unlock(zdb_zone *zone, u8 owner);

void zdb_zone_release_double_unlock(zdb_zone *zone, u8 owner, u8 nextowner);

/** @} */
