/*
 * Copyright (C) 2003-2012 FreeIPMI Core Team
 * 
 * This program 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 of the License, or
 * (at your option) any later version.
 *
 * This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
 * 
 */

#if HAVE_CONFIG_H
#include "config.h"
#endif /* HAVE_CONFIG_H */

#include <stdio.h>
#include <stdlib.h>
#if STDC_HEADERS
#include <string.h>
#endif /* STDC_HEADERS */
#if HAVE_UNISTD_H
#include <unistd.h>
#endif /* HAVE_UNISTD_H */
#if HAVE_FCNTL_H
#include <fcntl.h>
#endif /* HAVE_FCNTL_H */
#include <sys/stat.h>
#include <errno.h>
#include <assert.h>

#include "config-tool-argp.h"
#include "config-tool-utils.h"

#include "freeipmi-portability.h"

void
init_config_args (struct config_arguments *config_args)
{
  assert (config_args);

  config_args->action = 0;
  config_args->verbose_count = 0;
  config_args->filename = NULL;
  config_args->lan_channel_number = 0;
  config_args->lan_channel_number_set = 0;
  config_args->serial_channel_number = 0;
  config_args->serial_channel_number_set = 0;
  config_args->sol_channel_number = 0;
  config_args->sol_channel_number_set = 0;
  config_args->keypairs = NULL;
  config_args->section_strs = NULL;
}

static void
_config_parse_channel_number (char *arg,
                              uint8_t *channel_number,
                              int *channel_number_set)
{
  char *endptr;
  int tmp;

  assert (arg);
  assert (channel_number);
  assert (channel_number_set);

  tmp = strtol (arg, &endptr, 0);
  if (errno
      || endptr[0] != '\0')
    {
      fprintf (stderr, "invalid channel number\n");
      exit (1);
    }
  if (!IPMI_CHANNEL_NUMBER_VALID (tmp))
    {
      fprintf (stderr, "invalid channel number\n");
      exit(1);
    }
  (*channel_number) = (uint8_t)tmp;
  (*channel_number_set)++;
}

error_t
config_parse_opt (int key,
                  char *arg,
                  struct config_arguments *config_args)
{
  struct config_keypair *kp = NULL;
  struct config_section_str *sstr = NULL;
  char *section_name = NULL;
  char *key_name = NULL;
  char *value = NULL;

  switch (key)
    {
    case CONFIG_ARGP_CHECKOUT_KEY:
      if (!config_args->action)
        config_args->action = CONFIG_ACTION_CHECKOUT;
      else
        config_args->action = -1;
      break;
    case CONFIG_ARGP_COMMIT_KEY:
      if (!config_args->action)
        config_args->action = CONFIG_ACTION_COMMIT;
      else
        config_args->action = -1;
      break;
    case CONFIG_ARGP_DIFF_KEY:
      if (!config_args->action)
        config_args->action = CONFIG_ACTION_DIFF;
      else
        config_args->action = -1;
      break;
    case CONFIG_ARGP_FILENAME_KEY:
      free (config_args->filename);
      if (!(config_args->filename = strdup (arg)))
        {
          perror ("strdup");
          exit (1);
        }
      break;
    case CONFIG_ARGP_KEYPAIR_KEY:
      if (config_keypair_parse_string (arg,
                                       &section_name,
                                       &key_name,
                                       &value) < 0)
        {
          /* error printed in function call */
          exit (1);
        }
      if (!(kp = config_keypair_create (section_name,
                                        key_name,
                                        value)))
        {
          fprintf (stderr,
                   "config_keypair_create error\n");
          exit (1);
        }
      if (config_keypair_append (&(config_args->keypairs),
                                 kp) < 0)
        {
          /* error printed in function call */
          exit (1);
        }
      free (section_name);
      free (key_name);
      free (value);
      break;
    case CONFIG_ARGP_SECTIONS_KEY:
      if (!(sstr = config_section_str_create (arg)))
        {
          fprintf (stderr,
                   "config_section_str_create error\n");
          exit (1);
        }
      if (config_section_str_append (&(config_args->section_strs),
                                     sstr) < 0)
        {
          /* error printed in function call */
          exit (1);
        }
      sstr = NULL;
      break;
    case CONFIG_ARGP_LIST_SECTIONS_KEY:
      if (!config_args->action)
        config_args->action = CONFIG_ACTION_LIST_SECTIONS;
      else
        config_args->action = -1;
      break;
    case CONFIG_ARGP_VERBOSE_KEY:
      config_args->verbose_count++;
      break;
    case CONFIG_ARGP_LAN_CHANNEL_NUMBER_KEY:
      _config_parse_channel_number (arg,
                                    &(config_args->lan_channel_number),
                                    &(config_args->lan_channel_number_set));
      break;
    case CONFIG_ARGP_SERIAL_CHANNEL_NUMBER_KEY:
      _config_parse_channel_number (arg,
                                    &(config_args->serial_channel_number),
                                    &(config_args->serial_channel_number_set));
      break;
    case CONFIG_ARGP_SOL_CHANNEL_NUMBER_KEY:
      _config_parse_channel_number (arg,
                                    &(config_args->sol_channel_number),
                                    &(config_args->sol_channel_number_set));
      break;
    default:
      return (ARGP_ERR_UNKNOWN);
    }

  return (0);
}

void
config_args_validate (struct config_arguments *config_args)
{
  assert (config_args);

  /* filename and keypair both given for diff */
  if (config_args->filename && config_args->keypairs
      && config_args->action == CONFIG_ACTION_DIFF)
    {
      fprintf (stderr,
               "Both --filename or --keypair cannot be used\n");
      exit (1);
    }

  /* only one of keypairs or section can be given for checkout */
  if (config_args->action == CONFIG_ACTION_CHECKOUT
      && (config_args->keypairs && config_args->section_strs))
    {
      fprintf (stderr,
               "Only one of --filename, --keypair, and --section can be used\n");
      exit (1);
    }

  /* filename is readable if commit, writable/creatable if checkout */
  if (config_args->filename)
    {
      switch (config_args->action)
        {
        case CONFIG_ACTION_COMMIT:
        case CONFIG_ACTION_DIFF:
          if (access (config_args->filename, R_OK) < 0)
            {
              fprintf (stderr,
                       "Cannot read '%s': %s\n",
                       config_args->filename,
                       strerror (errno));
              exit (1);
            }
          break;
        case CONFIG_ACTION_CHECKOUT:
          if (access (config_args->filename, F_OK) == 0)
            {
              if (access (config_args->filename, W_OK) < 0)
                {
                  fprintf (stderr,
                           "Cannot write to '%s': %s\n",
                           config_args->filename,
                           strerror (errno));
                  exit (1);
                }
            }
          else
            {
              int fd;
              
              if ((fd = open (config_args->filename, O_CREAT, 0644)) < 0)
                {
                  fprintf (stderr,
                           "Cannot open '%s': %s\n",
                           config_args->filename,
                           strerror (errno));
                  exit (1);
                }
              else
                {
                  /* ignore close error, don't care right now */
                  close (fd);

                  if (unlink (config_args->filename) < 0)
                    {
                      fprintf (stderr,
                               "Cannot remove '%s': %s\n",
                               config_args->filename,
                               strerror (errno));
                      exit (1);
                    }
                }
            }
          break;
        case CONFIG_ACTION_LIST_SECTIONS:
          /* do nothing - here to remove compile warning */
          break;
        }
    }
}
