/*
   rc-depend
   rc service dependency and ordering
   Copyright 2006-2007 Gentoo Foundation
   Released under the GPLv2
   */

#include <sys/types.h>
#include <sys/stat.h>

#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "einfo.h"
#include "rc.h"
#include "rc-misc.h"
#include "strlist.h"

int main (int argc, char **argv)
{
  char **types = NULL;
  char **services = NULL;
  char **depends = NULL;
  rc_depinfo_t *deptree = NULL;
  rc_depinfo_t *di;
  char *service;
  int options = RC_DEP_TRACE;
  bool first = true;
  int i;
  bool update = false;
  char *runlevel = getenv ("RC_SOFTLEVEL");

  if (! runlevel)
    runlevel = rc_get_runlevel ();

  for (i = 1; i < argc; i++)
    {
      if (strcmp (argv[i], "--update") == 0)
	{
	  if (! update)
	    {
	      rc_update_deptree (true);
	      update = true;
	    }
	  continue;
	}

      if (strcmp (argv[i], "--strict") == 0)
	{
	  options |= RC_DEP_STRICT;
	  continue;
	}

      if (strcmp (argv[i], "--notrace") == 0)
	{
	  options &= RC_DEP_TRACE;
	  continue;
	}

      if (argv[i][0] == '-')
	{
	  argv[i]++;
	  types = rc_strlist_add (types, argv[i]);
	}
      else
	{
	  if ((deptree = rc_load_deptree ()) == NULL)
	    eerrorx ("failed to load deptree");

	  di = rc_get_depinfo (deptree, argv[i]);
	  if (! di)
	    eerror ("no dependency info for service `%s'", argv[i]);
	  else
	    services = rc_strlist_add (services, argv[i]);
	}
    }

  if (! services)
    {
      rc_strlist_free (types);
      rc_free_deptree (deptree);
      if (update)
	return (EXIT_SUCCESS);
      eerrorx ("no services specified");
    }

  /* If we don't have any types, then supply some defaults */
  if (! types)
    {
      types = rc_strlist_add (NULL, "ineed");
      rc_strlist_add (types, "iuse");
    }

  depends = rc_get_depends (deptree, types, services, runlevel, options);

  if (depends)
    {
      STRLIST_FOREACH (depends, service, i)
	{
	  if (first)
	    first = false;
	  else
	    printf (" ");

	  if (service)
	    printf ("%s", service);

	}
      printf ("\n");
    }

  rc_strlist_free (types);
  rc_strlist_free (services);
  rc_strlist_free (depends);
  rc_free_deptree (deptree);

  return (EXIT_SUCCESS);
}