/*
     This file is part of GNUnet.
     (C) 2001, 2002, 2004, 2005, 2006, 2007, 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 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 testing/gnunet-testing.c
 * @brief tool to use testing functionality from cmd line
 * @author Christian Grothoff
 */
#include "platform.h"
#include "gnunet_util_lib.h"
#include "gnunet_testing_lib.h"


/**
 * Final status code.
 */
static int ret;

static char *create_hostkey;

static int create_cfg;

static unsigned int create_no;

static char *create_cfg_template;


static int
create_unique_cfgs (const char * template, const unsigned int no)
{
  struct GNUNET_TESTING_System *system;
  int fail;
  unsigned int cur;
  char *cur_file;
  struct GNUNET_CONFIGURATION_Handle *cfg_new;
  struct GNUNET_CONFIGURATION_Handle *cfg_tmpl;

  if (GNUNET_NO == GNUNET_DISK_file_test(template))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Configuration template `%s': file not found\n", create_cfg_template);
    return 1;
  }
  cfg_tmpl = GNUNET_CONFIGURATION_create();

  /* load template */
  if ((create_cfg_template != NULL) && (GNUNET_OK != GNUNET_CONFIGURATION_load(cfg_tmpl, create_cfg_template)))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Could not load template `%s'\n", create_cfg_template);
    GNUNET_CONFIGURATION_destroy (cfg_tmpl);

    return 1;
  }
  /* load defaults */
  if (GNUNET_OK != GNUNET_CONFIGURATION_load (cfg_tmpl,  NULL))
  {
    GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Could not load template `%s'\n", create_cfg_template);
    GNUNET_CONFIGURATION_destroy (cfg_tmpl);
    return 1;
  }

  fail = GNUNET_NO;
  system = GNUNET_TESTING_system_create ("testing", NULL /* controller */, NULL);
  for (cur = 0; cur < no; cur++)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Creating configuration no. %u \n", cur);
    if (create_cfg_template != NULL)
      GNUNET_asprintf (&cur_file,"%04u-%s",cur, create_cfg_template);
    else
      GNUNET_asprintf (&cur_file,"%04u%s",cur, ".conf");

    cfg_new = GNUNET_CONFIGURATION_dup (cfg_tmpl);
    if (GNUNET_OK !=
	GNUNET_TESTING_configuration_create (system, cfg_new))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Could not create another configuration\n");
      GNUNET_CONFIGURATION_destroy (cfg_new);
      fail = GNUNET_YES;
      break;
    }
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
		"Writing configuration no. %u to file `%s' \n", cur, cur_file);
    if (GNUNET_OK != GNUNET_CONFIGURATION_write(cfg_new, cur_file))
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Failed to write configuration no. %u \n", cur);
      fail = GNUNET_YES;
    }
    GNUNET_CONFIGURATION_destroy (cfg_new);
    GNUNET_free (cur_file);
    if (GNUNET_YES == fail)
      break;
  }
  GNUNET_CONFIGURATION_destroy(cfg_tmpl);
  GNUNET_TESTING_system_destroy (system, GNUNET_NO);
  if (GNUNET_YES == fail)
    return 1;
  return 0;
}


static int
create_hostkeys (const unsigned int no)
{
  static char pad[GNUNET_TESTING_HOSTKEYFILESIZE];
  struct GNUNET_TESTING_System *system;
  struct GNUNET_PeerIdentity id;
  struct GNUNET_DISK_FileHandle *fd;
  struct GNUNET_CRYPTO_EccPrivateKey *pk;
  struct GNUNET_CRYPTO_EccPrivateKeyBinaryEncoded *pkb;
  ssize_t ret;

  system = GNUNET_TESTING_system_create ("testing", NULL, NULL);
  pk = GNUNET_TESTING_hostkey_get (system, create_no, &id);
  if (NULL == pk)
  {
    fprintf (stderr, _("Could not extract hostkey %u (offset too large?)\n"), create_no);
    GNUNET_TESTING_system_destroy (system, GNUNET_YES);
    return 1;
  }
  (void) GNUNET_DISK_directory_create_for_file (create_hostkey);
  fd = GNUNET_DISK_file_open (create_hostkey,
			      GNUNET_DISK_OPEN_READWRITE |
			      GNUNET_DISK_OPEN_CREATE,
			      GNUNET_DISK_PERM_USER_READ |
			      GNUNET_DISK_PERM_USER_WRITE);
  GNUNET_assert (fd != NULL);
  pkb = GNUNET_CRYPTO_ecc_encode_key (pk);
  ret = GNUNET_DISK_file_write (fd, pkb, 
				ntohs (pkb->size));
  GNUNET_assert (ntohs (pkb->size) == ret);
  GNUNET_assert (ntohs (pkb->size) < GNUNET_TESTING_HOSTKEYFILESIZE);
  GNUNET_assert (GNUNET_TESTING_HOSTKEYFILESIZE - ret ==
		 GNUNET_DISK_file_write (fd, pad, 
					 GNUNET_TESTING_HOSTKEYFILESIZE - ret));
  
  GNUNET_assert (GNUNET_OK == GNUNET_DISK_file_close (fd));
  GNUNET_log_from (GNUNET_ERROR_TYPE_DEBUG, "transport-testing",
		   "Wrote hostkey to file: `%s'\n", create_hostkey);
  GNUNET_free (pkb);
  GNUNET_CRYPTO_ecc_key_free (pk);
  GNUNET_TESTING_system_destroy (system, GNUNET_YES);
  return 0;
}


/**
 * Main function that will be run by the scheduler.
 *
 * @param cls closure
 * @param args remaining command-line arguments
 * @param cfgfile name of the configuration file used (for saving, can be NULL!)
 * @param cfg configuration
 */
static void
run (void *cls, char *const *args, const char *cfgfile,
     const struct GNUNET_CONFIGURATION_Handle *cfg)
{
  /* main code here */
  if (GNUNET_YES == create_cfg)
  {
    if (create_no > 0)
    {
      GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, 
		  "Creating %u configuration files based on template `%s'\n", create_no, create_cfg_template);
      ret = create_unique_cfgs (create_cfg_template, create_no);
    }
    else
    {
      GNUNET_log (GNUNET_ERROR_TYPE_ERROR, "Missing arguments! \n");
      ret = 1;
    }
  }
  if (NULL != create_hostkey)
  {
    GNUNET_log (GNUNET_ERROR_TYPE_DEBUG, "Extracting hostkey %u\n", create_no);
    ret = create_hostkeys (create_no);
  }
  GNUNET_free_non_null (create_cfg_template);
}


/**
 * The main function.
 *
 * @param argc number of arguments from the command line
 * @param argv command line arguments
 * @return 0 ok, 1 on error
 */
int
main (int argc, char *const *argv)
{
  static const struct GNUNET_GETOPT_CommandLineOption options[] = {
    {'C', "cfg", NULL, gettext_noop ("create unique configuration files"),
     GNUNET_NO, &GNUNET_GETOPT_set_one, &create_cfg},
    {'k', "key", "FILENAME", gettext_noop ("extract hostkey file from pre-computed hostkey list"),
     GNUNET_YES, &GNUNET_GETOPT_set_string, &create_hostkey},
    {'n', "number", "NUMBER", gettext_noop ("number of unique configuration files to create, or number of the hostkey to extract"),
     GNUNET_YES, &GNUNET_GETOPT_set_uint, &create_no},
    {'t', "template", "FILENAME", gettext_noop ("configuration template"),
     GNUNET_YES, &GNUNET_GETOPT_set_string, &create_cfg_template},
    GNUNET_GETOPT_OPTION_END
  };
  if (GNUNET_OK != GNUNET_STRINGS_get_utf8_args (argc, argv, &argc, &argv))
    return 2;

  ret = (GNUNET_OK ==
	 GNUNET_PROGRAM_run (argc, argv, "gnunet-testing",
			     gettext_noop ("Command line tool to access the testing library"), options, &run,
			     NULL)) ? ret : 1;
  GNUNET_free ((void*) argv);
  return ret;
}

/* end of gnunet-testing.c */