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/*
     This file is part of GNUnet.
     (C) 2003, 2004, 2006, 2009 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 2, 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 fs/fs_list_indexed.c
 * @author Christian Grothoff
 * @brief provide a list of all indexed files
 */

#include "platform.h"
#include "gnunet_constants.h"
#include "gnunet_fs_service.h"
#include "gnunet_protocols.h"
#include "fs.h"


/**
 * Context for "GNUNET_FS_get_indexed_files".
 */
struct GetIndexedContext
{
  /**
   * Handle to global FS context.
   */
  struct GNUNET_FS_Handle *h;

  /**
   * Connection to the FS service.
   */
  struct GNUNET_CLIENT_Connection *client;

  /**
   * Function to call for each indexed file.
   */
  GNUNET_FS_IndexedFileProcessor iterator;

  /**
   * Closure for iterator.
   */
  void *iterator_cls;

  /**
   * Continuation to trigger at the end.
   */
  GNUNET_SCHEDULER_Task cont;

  /**
   * Closure for cont.
   */
  void *cont_cls;
};


/**
 * Function called on each response from the FS
 * service with information about indexed files.
 *
 * @param cls closure (of type "struct GetIndexedContext*")
 * @param msg message with indexing information
 */
static void
handle_index_info (void *cls,
		   const struct GNUNET_MessageHeader *msg)
{
  struct GetIndexedContext *gic = cls;
  const struct IndexInfoMessage *iim;
  uint16_t msize;
  const char *filename;

  if (NULL == msg)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
		  _("Failed to receive response for `%s' request from `%s' service.\n"),
		  "GET_INDEXED",
		  "fs");
      GNUNET_SCHEDULER_add_continuation (gic->h->sched,
					 gic->cont,
					 gic->cont_cls,
					 GNUNET_SCHEDULER_REASON_TIMEOUT);
      GNUNET_CLIENT_disconnect (gic->client, GNUNET_NO);
      GNUNET_free (gic);
      return;
    }
  if (ntohs (msg->type) == GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_END)
    {
      /* normal end-of-list */
      GNUNET_SCHEDULER_add_continuation (gic->h->sched,
					 gic->cont,
					 gic->cont_cls,
					 GNUNET_SCHEDULER_REASON_PREREQ_DONE);
      GNUNET_CLIENT_disconnect (gic->client, GNUNET_NO);
      GNUNET_free (gic);
      return;
    }
  msize = ntohs (msg->size);
  iim = (const struct IndexInfoMessage*) msg;
  filename = (const char*) &iim[1];
  if ( (ntohs (msg->type) != GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_ENTRY) ||
       (msize <= sizeof (struct IndexInfoMessage)) ||
       (filename[msize-sizeof (struct IndexInfoMessage) -1] != '\0') )
    {
      /* bogus reply */
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
		  _("Failed to receive valid response for `%s' request from `%s' service.\n"),
		  "GET_INDEXED",
		  "fs");
      GNUNET_SCHEDULER_add_continuation (gic->h->sched,
					 gic->cont,
					 gic->cont_cls,
					 GNUNET_SCHEDULER_REASON_TIMEOUT);
      GNUNET_CLIENT_disconnect (gic->client, GNUNET_NO);
      GNUNET_free (gic);
      return;
    }
  if (GNUNET_OK !=
      gic->iterator (gic->iterator_cls,
		     filename,
		     &iim->file_id))
    {
      GNUNET_SCHEDULER_add_continuation (gic->h->sched,
					 gic->cont,
					 gic->cont_cls,
					 GNUNET_SCHEDULER_REASON_PREREQ_DONE);
      GNUNET_CLIENT_disconnect (gic->client, GNUNET_NO);
      GNUNET_free (gic);
      return;
    }
  /* get more */
  GNUNET_CLIENT_receive (gic->client,
			 &handle_index_info,
			 gic,
			 GNUNET_CONSTANTS_SERVICE_TIMEOUT);  
}


/**
 * Iterate over all indexed files.
 *
 * @param h handle to the file sharing subsystem
 * @param iterator function to call on each indexed file
 * @param iterator_cls closure for iterator
 * @param cont continuation to call when done;
 *             reason should be "TIMEOUT" (on
 *             error) or  "PREREQ_DONE" (on success)
 * @param cont_cls closure for cont
 */
void 
GNUNET_FS_get_indexed_files (struct GNUNET_FS_Handle *h,
			     GNUNET_FS_IndexedFileProcessor iterator,
			     void *iterator_cls,
			     GNUNET_SCHEDULER_Task cont,
			     void *cont_cls)
{
  struct GNUNET_CLIENT_Connection *client;
  struct GetIndexedContext *gic;
  struct GNUNET_MessageHeader msg;

  client = GNUNET_CLIENT_connect (h->sched,
				  "fs",
				  h->cfg);
  if (NULL == client)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
		  _("Failed to not connect to `%s' service.\n"),
		  "fs");
      GNUNET_SCHEDULER_add_continuation (h->sched,
					 cont,
					 cont_cls,
					 GNUNET_SCHEDULER_REASON_TIMEOUT);
      return;
    }

  gic = GNUNET_malloc (sizeof (struct GetIndexedContext));
  gic->h = h;
  gic->client = client;
  gic->iterator = iterator;
  gic->iterator_cls = iterator_cls;
  gic->cont = cont;
  gic->cont_cls = cont_cls;
  msg.size = htons (sizeof (struct GNUNET_MessageHeader));
  msg.type = htons (GNUNET_MESSAGE_TYPE_FS_INDEX_LIST_GET);
  GNUNET_assert (GNUNET_OK ==
		 GNUNET_CLIENT_transmit_and_get_response (client,
							  &msg,
							  GNUNET_CONSTANTS_SERVICE_TIMEOUT,
							  GNUNET_YES,
							  &handle_index_info,
							  gic));
}

/* end of fs_list_indexed.c */