// 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:
//	Plats (i.e. elevator platforms) code, raising/lowering.
//
//-----------------------------------------------------------------------------

//static const char 

//rcsid[] = "$Id: p_plats.c,v 1.5 1997/02/03 22:45:12 b1 Exp $";


#include "i_system.h"
#include "z_zone.h"
#include "m_random.h"

#include "doomdef.h"
#include "p_local.h"

//#include "s_sound.h"

// State.
#include "doomstat.h"
#include "r_state.h"

// Data.
//#include "sounds.h"


plat_t*		activeplats[MAXPLATS];



//
// Move a plat up and down
//
void T_PlatRaise(plat_t* plat)
{
    result_e	res;
	
    switch(plat->status)
    {
		case up:
			res = T_MovePlane(plat->sector,
					  plat->speed,
					  plat->high,
					  plat->crush,0,1);
						
			if (res == crushed && (!plat->crush))
			{
				plat->count = plat->wait;
				plat->status = down;
			}
			else
			{
				if (res == pastdest)
				{
				plat->count = plat->wait;
				plat->status = waiting;

				switch(plat->type)
				{
				  case blazeDWUS:
				  case downWaitUpStay:
					P_RemoveActivePlat(plat);
					break;
					
				  case raiseAndChange:
				  case raiseToNearestAndChange:
					P_RemoveActivePlat(plat);
					break;
					
				  default:
					break;
				}
				}
			}
			break;
		
		case	down:
			res = T_MovePlane(plat->sector,plat->speed,plat->low,false,0,-1);

			if (res == pastdest)
			{
				plat->count = plat->wait;
				plat->status = waiting;
			}
			break;
		
		case	waiting:
			if (!--plat->count)
			{
				if (plat->sector->floorheight == plat->low)
				plat->status = up;
				else
				plat->status = down;
			}
		case	in_stasis:
			break;
    }
}


//
// Do Platforms
//  "amount" is only used for SOME platforms.
//
int
EV_DoPlat
( line_t*	line,
  plattype_e	type,
  int		amount )
{
    plat_t*	plat;
    int		secnum;
    int		rtn;
    sector_t*	sec;
	
    secnum = -1;
    rtn = 0;

    
    //	Activate all <type> plats that are in_stasis
    switch(type)
    {
      case perpetualRaise:
	P_ActivateInStasis(line->tag);
	break;
	
      default:
	break;
    }
	
    while ((secnum = P_FindSectorFromLineTag(line,secnum)) >= 0)
    {
	sec = &sectors[secnum];

	if (sec->specialdata)
	    continue;
	
	// Find lowest & highest floors around sector
	rtn = 1;
	plat = Z_Malloc( sizeof(*plat), PU_LEVSPEC, 0);
	P_AddThinker(&plat->thinker,plat);
		
	plat->type = type;
	plat->sector = sec;
	plat->sector->specialdata = plat;
	plat->thinker.function = TT_PlatRaise;
	plat->crush = false;
	plat->tag = line->tag;
	
	switch(type)
	{
	  case raiseToNearestAndChange:
	    plat->speed = PLATSPEED/2;
	    sec->floorpic = sides[line->sidenum[0]].sector->floorpic;
	    plat->high = P_FindNextHighestFloor(sec,sec->floorheight);
	    plat->wait = 0;
	    plat->status = up;
	    // NO MORE DAMAGE, IF APPLICABLE
	    sec->special = 0;
	    break;
	    
	  case raiseAndChange:
	    plat->speed = PLATSPEED/2;
	    sec->floorpic = sides[line->sidenum[0]].sector->floorpic;
	    plat->high = sec->floorheight + amount*FRACUNIT;
	    plat->wait = 0;
	    plat->status = up;
	    break;
	    
	  case downWaitUpStay:
	    plat->speed = PLATSPEED * 4;
	    plat->low = P_FindLowestFloorSurrounding(sec);

	    if (plat->low > sec->floorheight)
		plat->low = sec->floorheight;

	    plat->high = sec->floorheight;
	    plat->wait = 35*PLATWAIT;
	    plat->status = down;
	    break;
	    
	  case blazeDWUS:
	    plat->speed = PLATSPEED * 8;
	    plat->low = P_FindLowestFloorSurrounding(sec);

	    if (plat->low > sec->floorheight)
		plat->low = sec->floorheight;

	    plat->high = sec->floorheight;
	    plat->wait = 35*PLATWAIT;
	    plat->status = down;
	    break;
	    
	  case perpetualRaise:
	    plat->speed = PLATSPEED;
	    plat->low = P_FindLowestFloorSurrounding(sec);

	    if (plat->low > sec->floorheight)
		plat->low = sec->floorheight;

	    plat->high = P_FindHighestFloorSurrounding(sec);

	    if (plat->high < sec->floorheight)
		plat->high = sec->floorheight;

	    plat->wait = 35*PLATWAIT;
	    plat->status = P_Random()&1;
	    break;
	}
	P_AddActivePlat(plat);
    }
    return rtn;
}



void P_ActivateInStasis(int tag)
{
    int		i;
	
    for (i = 0;i < MAXPLATS;i++)
	if (activeplats[i]
	    && (activeplats[i])->tag == tag
	    && (activeplats[i])->status == in_stasis)
	{
	    (activeplats[i])->status = (activeplats[i])->oldstatus;
	    (activeplats[i])->thinker.function = TT_PlatRaise;
	}
}

void EV_StopPlat(line_t* line)
{
    int		j;
	
    for (j = 0;j < MAXPLATS;j++)
	if (activeplats[j]
	    && ((activeplats[j])->status != in_stasis)
	    && ((activeplats[j])->tag == line->tag))
	{
	    (activeplats[j])->oldstatus = (activeplats[j])->status;
	    (activeplats[j])->status = in_stasis;
	    (activeplats[j])->thinker.function = 0;
	}
}

void P_AddActivePlat(plat_t* plat)
{
    int		i;
    
    for (i = 0;i < MAXPLATS;i++)
	if (activeplats[i] == NULL)
	{
	    activeplats[i] = plat;
	    return;
	}
    I_Error ("P_AddActivePlat: no more plats!");
}

void P_RemoveActivePlat(plat_t* plat)
{
    int		i;
    for (i = 0;i < MAXPLATS;i++)
	if (plat == activeplats[i])
	{
	    (activeplats[i])->sector->specialdata = NULL;
	    P_RemoveThinker(&(activeplats[i])->thinker);
	    activeplats[i] = NULL;
	    
	    return;
	}
    I_Error ("P_RemoveActivePlat: can't find plat!");
}