/*
     This file is part of GNUnet.
     (C) 2009, 2010 Christian Grothoff (and other contributing authors)

     GNUnet is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published
     by the Free Software Foundation; either version 3, or (at your
     option) any later version.

     GNUnet is distributed in the hope that it will be useful, but
     WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     General Public License for more details.

     You should have received a copy of the GNU General Public License
     along with GNUnet; see the file COPYING.  If not, write to the
     Free Software Foundation, Inc., 59 Temple Place - Suite 330,
     Boston, MA 02111-1307, USA.
*/

/**
 * @file gns/namestore_stub_api.c
 * @brief stub library to access the NAMESTORE service
 * @author Martin Schanzenbach
 */

#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_constants.h"
#include "gnunet_arm_service.h"
#include "gnunet_namestore_service.h"

#define DEBUG_GNS_API GNUNET_EXTRA_LOGGING

#define LOG(kind,...) GNUNET_log_from (kind, "gns-api",__VA_ARGS__)

/**
 * A QueueEntry.
 */
struct GNUNET_NAMESTORE_QueueEntry
{
  char *data; /*stub data pointer*/
};

/**
 * Connection to the NAMESTORE service.
 */
struct GNUNET_NAMESTORE_Handle
{

  /**
   * Configuration to use.
   */
  const struct GNUNET_CONFIGURATION_Handle *cfg;

  /**
   * Socket (if available).
   */
  struct GNUNET_CLIENT_Connection *client;

  /**
   * Currently pending transmission request (or NULL).
   */
  struct GNUNET_CLIENT_TransmitHandle *th;

  /* dll to use for records */
  struct GNUNET_NAMESTORE_SimpleRecord * records_head;
  struct GNUNET_NAMESTORE_SimpleRecord * records_tail;

};

struct GNUNET_NAMESTORE_ZoneIterator
{
  struct GNUNET_NAMESTORE_Handle *handle;
};

struct GNUNET_NAMESTORE_SimpleRecord
{
  /**
   * DLL
   */
  struct GNUNET_NAMESTORE_SimpleRecord *next;

  /**
   * DLL
   */
  struct GNUNET_NAMESTORE_SimpleRecord *prev;
  
  const char *name;
  const GNUNET_HashCode *zone;
  uint32_t record_type;
  struct GNUNET_TIME_Absolute expiration;
  enum GNUNET_NAMESTORE_RecordFlags flags;
  size_t data_size;
  const void *data;
};

/**
 * Initialize the connection with the NAMESTORE service.
 *
 * @param cfg configuration to use
 * @return handle to the GNS service, or NULL on error
 */
struct GNUNET_NAMESTORE_Handle *
GNUNET_NAMESTORE_connect (const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  struct GNUNET_NAMESTORE_Handle *handle;

  handle = GNUNET_malloc (sizeof (struct GNUNET_NAMESTORE_Handle));
  handle->cfg = cfg;
  return handle;
}


/**
 * Shutdown connection with the NAMESTORE service.
 *
 * @param handle handle of the NAMESTORE connection to stop
 */
void
GNUNET_NAMESTORE_disconnect (struct GNUNET_NAMESTORE_Handle *handle, int drop)
{
  GNUNET_free(handle);
}

/**
 * Store an item in the namestore.  If the item is already present,
 * the expiration time is updated to the max of the existing time and
 * the new time.  The operation must fail if there is no matching
 * entry in the signature tree.
 *
 * @param h handle to the namestore
 * @param zone hash of the public key of the zone
 * @param name name that is being mapped (at most 255 characters long)
 * @param record_type type of the record (A, AAAA, PKEY, etc.)
 * @param expiration expiration time for the content
 * @param flags flags for the content
 * @param data_size number of bytes in data
 * @param data value, semantics depend on 'record_type' (see RFCs for DNS and 
 *             GNS specification for GNS extensions)
 * @param cont continuation to call when done
 * @param cont_cls closure for cont
 * @return handle to abort the request
 */
struct GNUNET_NAMESTORE_QueueEntry *
GNUNET_NAMESTORE_record_put (struct GNUNET_NAMESTORE_Handle *h,
			     const GNUNET_HashCode *zone,
			     const char *name,
			     struct GNUNET_TIME_Absolute expiration,
			     unsigned int rd_count,
           const struct GNUNET_NAMESTORE_RecordData *rd,
           const struct GNUNET_CRYPTO_RsaSignature *signature,
           GNUNET_NAMESTORE_ContinuationWithStatus cont,
			     void *cont_cls)
{
  struct GNUNET_NAMESTORE_QueueEntry *qe;
  qe = GNUNET_malloc(sizeof (struct GNUNET_NAMESTORE_QueueEntry));
  //FIXME
  return qe;
}

int
GNUNET_NAMESTORE_verify_signature (const struct GNUNET_CRYPTO_RsaPublicKeyBinaryEncoded *public_key,
                                   const char *name,
                                   unsigned int rd_count,
                                   const struct GNUNET_NAMESTORE_RecordData *rd,
                                   const struct GNUNET_CRYPTO_RsaSignature *signature)
{
  return GNUNET_OK;
}

struct GNUNET_NAMESTORE_QueueEntry *
GNUNET_NAMESTORE_record_create (struct GNUNET_NAMESTORE_Handle *h,
			     const struct GNUNET_CRYPTO_RsaPrivateKey *pkey,
			     const char *name,
           const struct GNUNET_NAMESTORE_RecordData *rd,
           GNUNET_NAMESTORE_ContinuationWithStatus cont,
			     void *cont_cls)
{
  struct GNUNET_NAMESTORE_QueueEntry *qe;
  qe = GNUNET_malloc(sizeof (struct GNUNET_NAMESTORE_QueueEntry));
  //FIXME
  return qe;
}

/**
 * Explicitly remove some content from the database.  The
 * "cont"inuation will be called with status "GNUNET_OK" if content
 * was removed, "GNUNET_NO" if no matching entry was found and
 * "GNUNET_SYSERR" on all other types of errors.
 *
 * @param h handle to the namestore
 * @param zone hash of the public key of the zone
 * @param name name that is being mapped (at most 255 characters long)
 * @param record_type type of the record (A, AAAA, PKEY, etc.)
 * @param size number of bytes in data
 * @param data content stored
 * @param cont continuation to call when done
 * @param cont_cls closure for cont
 * @return handle to abort the request
 */
struct GNUNET_NAMESTORE_QueueEntry *
GNUNET_NAMESTORE_record_remove (struct GNUNET_NAMESTORE_Handle *h,
				const struct GNUNET_CRYPTO_RsaPrivateKey *pkey,
				const char *name,
				const struct GNUNET_NAMESTORE_RecordData *rd,
        GNUNET_NAMESTORE_ContinuationWithStatus cont,
				void *cont_cls)
{
  struct GNUNET_NAMESTORE_QueueEntry *qe;
  qe = GNUNET_malloc(sizeof (struct GNUNET_NAMESTORE_QueueEntry));
  
  //FIXME
  return qe;
}

/**
 * Get a result for a particular key from the namestore.  The processor
 * will only be called once.
 *
 * @param h handle to the namestore
 * @param zone zone to look up a record from
 * @param name name to look up
 * @param record_type desired record type
 * @param proc function to call on each matching value;
 *        will be called once with a NULL value at the end
 * @param proc_cls closure for proc
 * @return a handle that can be used to
 *         cancel
 */
struct GNUNET_NAMESTORE_QueueEntry *
GNUNET_NAMESTORE_lookup_record (struct GNUNET_NAMESTORE_Handle *h, 
			      const GNUNET_HashCode *zone,
			      const char *name,
			      uint32_t record_type,
			      GNUNET_NAMESTORE_RecordProcessor proc, void *proc_cls)
{
  struct GNUNET_NAMESTORE_QueueEntry *qe;
  qe = GNUNET_malloc(sizeof (struct GNUNET_NAMESTORE_QueueEntry));

  //FIXME
  return qe;
}

struct GNUNET_NAMESTORE_ZoneIterator *
GNUNET_NAMESTORE_zone_iteration_start(struct GNUNET_NAMESTORE_Handle *h,
                                      const GNUNET_HashCode *zone,
                                      enum GNUNET_NAMESTORE_RecordFlags must_have_flags,
                                      enum GNUNET_NAMESTORE_RecordFlags must_not_have_flags,
                                      GNUNET_NAMESTORE_RecordProcessor proc,
                                      void *proc_cls)
{
  struct GNUNET_NAMESTORE_ZoneIterator *it;
  it = GNUNET_malloc(sizeof(struct GNUNET_NAMESTORE_ZoneIterator));
  return it;
}

void
GNUNET_NAMESTORE_zone_iterator_next(struct GNUNET_NAMESTORE_ZoneIterator *it)
{
}

void
GNUNET_NAMESTORE_zone_iteration_stop(struct GNUNET_NAMESTORE_ZoneIterator *it)
{
}

/**
 * Cancel a namestore operation.  The final callback from the
 * operation must not have been done yet.
 *
 * @param qe operation to cancel
 */
void
GNUNET_NAMESTORE_cancel (struct GNUNET_NAMESTORE_QueueEntry *qe)
{
  if (qe)
    GNUNET_free(qe);
}




/* end of namestore_stub_api.c */