/* sleep.c - Command to wait a specified number of seconds.  */
/*
 *  VAS_EBOOT  --  GRand Unified Bootloader
 *  Copyright (C) 2006,2007,2008  Free Software Foundation, Inc.
 *
 *  VAS_EBOOT 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.
 *
 *  VAS_EBOOT 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 VAS_EBOOT.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <VasEBoot/dl.h>
#include <VasEBoot/term.h>
#include <VasEBoot/time.h>
#include <VasEBoot/types.h>
#include <VasEBoot/misc.h>
#include <VasEBoot/extcmd.h>
#include <VasEBoot/i18n.h>

VAS_EBOOT_MOD_LICENSE ("GPLv3+");

static const struct VasEBoot_arg_option options[] =
  {
    {"verbose", 'v', 0, N_("Verbose countdown."), 0, 0},
    {"interruptible", 'i', 0, N_("Allow to interrupt with ESC."), 0, 0},
    {0, 0, 0, 0, 0, 0}
  };

static struct VasEBoot_term_coordinate *pos;

static void
do_print (int n)
{
  VasEBoot_term_restore_pos (pos);
  /* NOTE: Do not remove the trailing space characters.
     They are required to clear the line.  */
  VasEBoot_printf ("%d    ", n);
  VasEBoot_refresh ();
}

/* Based on VasEBoot_millisleep() from kern/generic/millisleep.c.  */
static int
VasEBoot_interruptible_millisleep (VasEBoot_uint32_t ms)
{
  VasEBoot_uint64_t start;

  start = VasEBoot_get_time_ms ();

  while (VasEBoot_get_time_ms () - start < ms)
    if (VasEBoot_key_is_interrupt (VasEBoot_getkey_noblock ()))
      return 1;

  return 0;
}

static VasEBoot_err_t
VasEBoot_cmd_sleep (VasEBoot_extcmd_context_t ctxt, int argc, char **args)
{
  struct VasEBoot_arg_list *state = ctxt->state;
  int n;

  if (argc != 1)
    return VasEBoot_error (VAS_EBOOT_ERR_BAD_ARGUMENT, N_("one argument expected"));

  n = VasEBoot_strtoul (args[0], 0, 10);

  if (n == 0)
    {
      /* Either `0' or broken input.  */
      return 0;
    }

  VasEBoot_refresh ();

  pos = VasEBoot_term_save_pos ();

  for (; n; n--)
    {
      if (state[0].set)
	do_print (n);

      if (state[1].set)
	{
	  if (VasEBoot_interruptible_millisleep (1000))
	    return 1;
	}
      else
	VasEBoot_millisleep (1000);
    }
  if (state[0].set)
    do_print (0);

  return 0;
}

static VasEBoot_extcmd_t cmd;

VAS_EBOOT_MOD_INIT(sleep)
{
  cmd = VasEBoot_register_extcmd ("sleep", VasEBoot_cmd_sleep, 0,
			      N_("NUMBER_OF_SECONDS"),
			      N_("Wait for a specified number of seconds."),
			      options);
}

VAS_EBOOT_MOD_FINI(sleep)
{
  VasEBoot_unregister_extcmd (cmd);
}