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/* This file is part of GNU Pies.
   Copyright (C) 2013 Sergey Poznyakoff

   GNU Pies 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.

   GNU Pies 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 GNU Pies.  If not, see <http://www.gnu.org/licenses/>. */

#include "pies.h"

enum boot_state
  {
    sysinit,
    boot,
    single0,
    single1,
    normal,
    max_boot_state
  };

static char *boot_state_name[] = {
  "sysinit",
  "boot",
  "single0",
  "single1",
  "normal"
};

static char boot_state_str[] = "#*sS ";

static const char valid_runlevels[] = "0123456789S";

static int boot_trans_tab[max_boot_state][sizeof(valid_runlevels)-1]  = {
  /*                    0,       1,       2,       3,       4,             */
  /*                         5,       6,       7,       8,       9,      S */
  /* sysinit */ {    boot,    boot,    boot,    boot,    boot,
		          boot,    boot,    boot,    boot,    boot, single0 },
  /* boot    */ {  normal,  normal,  normal,  normal,  normal,
		        normal,  normal,  normal,  normal,  normal, single1 },
  /* single0 */ {  normal,  normal,  normal,  normal,  normal,
		        normal,  normal,  normal,  normal,  normal, single0 },
  /* single1 */ {  normal,  normal,  normal,  normal,  normal,
		        normal,  normal,  normal,  normal,  normal, single1 },
  /* normal  */ {  normal,  normal,  normal,  normal,  normal,
		        normal,  normal,  normal,  normal,  normal, single1 },
};

enum boot_state boot_state;
int runlevel = 0;

int initdefault;               /* Default runlevel */
int dfl_level;

static int
runlevel_index (int n)
{
  char *p;

  if (n == 0)
    return -1;
  
  p = strchr (valid_runlevels, n);
  if (!p)
    return -1;
  return p - valid_runlevels;
}

static int
enablecomp (struct component *comp, int finished, void *data)
{
  int *wait = data;
  int rc;
  
  switch (boot_state)
    {
    case sysinit:
      return comp->mode == pies_comp_sysinit;
	  
    case boot:
      return comp->mode == pies_comp_boot || comp->mode == pies_comp_bootwait;
	  
    case single0:
    case single1:
    case normal:
      switch (comp->mode)
	{
	case pies_comp_sysinit:
	case pies_comp_boot:
	case pies_comp_bootwait:
	  return 0;
	case pies_comp_powerfail:
	case pies_comp_powerwait:
	case pies_comp_powerokwait:
	case pies_comp_ctrlaltdel:
	case pies_comp_ondemand:
	case pies_comp_powerfailnow:
	case pies_comp_kbrequest:
	  /* FIXME */
	  return 0;
	}
    }
  rc = !!strchr (comp->runlevels, runlevel);
  if (!rc)
    return rc;
  if (finished)
    return -1;
  if (wait)
    {
      if (comp->mode == pies_comp_wait)
	{
	  *wait = 1;
	  return 1;
	}
      return 0;
    }
  return rc;
}

void
sysvinit_begin ()
{
  progman_sysvinit_enable (enablecomp, NULL);
}

int
inittrans ()
{
  int n;
  int newlevel = 0;
  enum boot_state newstate;
  int trans = 0;
  static int wait = 0;

  if (progman_running_p ())
    /* Noting to do if there are processes left in the previous runlevel */
    return 0;

  if (runlevel == 0)
    n = runlevel_index (dfl_level ? dfl_level : initdefault);
  else
    n = runlevel_index (runlevel);
  if (n == -1)
    n = runlevel_index ('S');
  
  newstate = boot_trans_tab[boot_state][n];
  debug (1, ("STATE TRANS: %s(%c,%d) -> %s", boot_state_name[boot_state],
	     runlevel,n,
	     boot_state_name[newstate]));
  if (newstate != boot_state)
    {
      debug (1, ("STATE TRANS: %s -> %s", boot_state_name[boot_state],
		 boot_state_name[newstate]));
      boot_state = newstate;
      trans = 1;
    }
  
  switch (boot_state)
    {
    case sysinit:
      break;
    case boot:
      sysvinit_acct (SYSV_ACCT_BOOT, "reboot", "~~", 0, "~");
      break;
    case single0:
    case single1:
      newlevel = 'S';
      break;
    case normal:
      /* boot -> normal */
      newlevel = dfl_level ? dfl_level : initdefault;
    }
  if (newlevel && newlevel != runlevel)
    {
      debug (1, ("RL TRANS: %c -> %c", runlevel, newlevel));
      sysvinit_acct (SYSV_ACCT_RUNLEVEL, "runlevel", "~~",
		     newlevel + 256 * runlevel, "~");
      mf_proctitle_format ("init [%c]", newlevel);
      runlevel = newlevel;
      trans = 1;
      wait  = 0;
    }
  if (wait)
    trans = 1;
  if (trans)
    {
      if (wait == 0)
	{
	  progman_sysvinit_enable (enablecomp, &wait);
	  if (wait)
	    return 1;
	}
      progman_sysvinit_enable (enablecomp, NULL);
    }
  return trans;
}

/* Return true if the progman should wait for the component to
   terminate. */
int
is_comp_wait (struct component *comp)
{
  switch (comp->mode)
    {
    case pies_comp_boot:
    case pies_comp_powerfail:
    case pies_comp_ctrlaltdel:
    case pies_comp_powerfailnow:
    case pies_comp_kbrequest:
      return 0;
    }
  return 1;
}
  

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