// 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"

#include "i_system.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, void* tgt)
{
    thinkercap.prev->next = thinker;
    thinker->next = &thinkercap;
    thinker->prev = thinkercap.prev;
	thinker->target= tgt;
    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 = TT_Ded;
}



/*//
// 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)
    {
		if ( currentthinker->function == TT_Ded )
		{
			//I_Error("fucks, thinker died");
			// time to remove it
			currentthinker->next->prev = currentthinker->prev;
			currentthinker->prev->next = currentthinker->next;
			Z_Free (currentthinker);
		}
		else
		{
			// If action not null...
			if (currentthinker->function)
			{
				// ...execute its action (since we've removed the function pointers, we're doing it in an old fashioned way...)
				switch (currentthinker->function)
				{
					case TP_MobjThinker:
						P_MobjThinker(currentthinker->target);
						break;
					case TT_MoveCeiling:
						T_MoveCeiling(currentthinker->target);
						break;
					case TT_VerticalDoor:
						T_VerticalDoor(currentthinker->target);
						break;
					case TT_PlatRaise:
						T_PlatRaise(currentthinker->target);
						break;
					case TT_MoveFloor:
						T_MoveFloor(currentthinker->target);
						break;
					case TT_LightFlash:
						T_LightFlash(currentthinker->target);
						break;
					case TT_StrobeFlash:
						T_StrobeFlash(currentthinker->target);
						break;
					case TT_Glow:
						T_Glow(currentthinker->target);
						break;
					case TT_FireFlicker:
						T_FireFlicker(currentthinker->target);
						break;
					default:
						printf("func= %i \n",currentthinker->function);
						I_Error("UNDEFINED OBJ FUNCTION");
						break;
				}
				//I_Error("TSB");
				//currentthinker->function (currentthinker);
				//currentthinker->function (currentthinker,NULL);
			}
		}
		currentthinker = currentthinker->next;
    }
}



//
// P_Ticker
//

void P_Ticker (void)
{
    
    // run the tic
    if (paused)
		return;
		
    // pause if in menu and at least one tic has been run
    if ( menuactive && !demoplayback && players[consoleplayer].viewz != 1)
    {
		return;
    }
	
	if (playeringame[0])
		P_PlayerThink (&players[0]);
	
    P_RunThinkers ();
	
    P_UpdateSpecials ();
	
    P_RespawnSpecials ();
	
    // for par times
    leveltime++;	
}