/* Emacs style mode select   -*- C++ -*- */
/*-----------------------------------------------------------------------------*/

/* $Id:$*/

/* Copyright (C) 1993-1996 by id Software, Inc.*/

/* This source is available for distribution and/or modification*/
/* only under the terms of the DOOM Source Code License as*/
/* published by id Software. All rights reserved.*/

/* The source is distributed in the hope that it will be useful,*/
/* but WITHOUT ANY WARRANTY; without even the implied warranty of*/
/* FITNESS FOR A PARTICULAR PURPOSE. See the DOOM Source Code License*/
/* for more details.*/

/* $Log:$*/

/* DESCRIPTION:*/
/*	Archiving: SaveGame I/O.*/
/*	Thinker, Ticker.*/

/*-----------------------------------------------------------------------------*/

static const char
rcsid[] = "$Id: p_tick.c,v 1.4 1997/02/03 16:47:55 b1 Exp $";

#include "z_zone.h"
#include "p_local.h"

#include "doomstat.h"


int	leveltime;


/* THINKERS*/
/* All thinkers should be allocated by Z_Malloc*/
/* so they can be operated on uniformly.*/
/* The actual structures will vary in size,*/
/* but the first element must be thinker_t.*/




/* Both the head and tail of the thinker list.*/
thinker_t	thinkercap;



/* P_InitThinkers*/

void P_InitThinkers (void)
{
    thinkercap.prev = thinkercap.next  = &thinkercap;
}





/* P_AddThinker*/
/* Adds a new thinker at the end of the list.*/

void P_AddThinker (thinker_t* thinker)
{
    thinkercap.prev->next = thinker;
    thinker->next = &thinkercap;
    thinker->prev = thinkercap.prev;
    thinkercap.prev = thinker;
}




/* P_RemoveThinker*/
/* Deallocation is lazy -- it will not actually be freed*/
/* until its thinking turn comes up.*/

void P_RemoveThinker (thinker_t* thinker)
{
  /* FIXME: NOP.*/
  thinker->function.acv = (actionf_v)(-1);
}




/* P_AllocateThinker*/
/* Allocates memory and adds a new thinker at the end of the list.*/

void P_AllocateThinker (thinker_t*	thinker)
{
}




/* P_RunThinkers*/

void P_RunThinkers (void)
{
    thinker_t*	currentthinker;

    currentthinker = thinkercap.next;
    while (currentthinker != &thinkercap)
    {
        thinker_t *nextthinker = currentthinker->next;

	if ( currentthinker->function.acv == (actionf_v)(-1) )
	{
	    /* time to remove it*/
	    currentthinker->next->prev = currentthinker->prev;
	    currentthinker->prev->next = currentthinker->next;
	    Z_Free (currentthinker);
	}
	else
	{
	    if (currentthinker->function.acp1)
		currentthinker->function.acp1 (currentthinker);
	}
	currentthinker = nextthinker;
    }
}




/* P_Ticker*/


void P_Ticker (void)
{
    int		i;

    /* run the tic*/
    if (paused)
	return;

    /* pause if in menu and at least one tic has been run*/
    if ( !netgame
	 && menuactive
	 && !demoplayback
	 && players[consoleplayer].viewz != 1)
    {
	return;
    }


    for (i=0 ; i<MAXPLAYERS ; i++)
	if (playeringame[i])
	    P_PlayerThink (&players[i]);

    P_RunThinkers ();
    P_UpdateSpecials ();
    P_RespawnSpecials ();

    /* for par times*/
    leveltime++;
}
