// P_plats.c

#include "DoomDef.h"
#include "P_local.h"
#include "soundst.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(!(leveltime&31))
			{
				S_StartSound((mobj_t *)&plat->sector->soundorg,
					sfx_stnmov);
			}
			if(plat->type == raiseAndChange
				|| plat->type == raiseToNearestAndChange)
			{
				if(!(leveltime&7))
				{
					S_StartSound((mobj_t *)&plat->sector->soundorg,
						sfx_stnmov);
				}
			}
			if (res == crushed && (!plat->crush))
			{
				plat->count = plat->wait;
				plat->status = down;
				S_StartSound((mobj_t *)&plat->sector->soundorg, sfx_pstart);
			}
			else
			if (res == pastdest)
			{
				plat->count = plat->wait;
				plat->status = waiting;
				S_StartSound((mobj_t *)&plat->sector->soundorg, sfx_pstop);
				switch(plat->type)
				{
					case downWaitUpStay:
						P_RemoveActivePlat(plat);
						break;
					case raiseAndChange:
						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;
				S_StartSound((mobj_t *)&plat->sector->soundorg, sfx_pstop);
			}
			else
			{
				if(!(leveltime&31))
				{
					S_StartSound((mobj_t *)&plat->sector->soundorg,
						sfx_stnmov);
				}
			}
			break;
		case	waiting:
			if (!--plat->count)
			{
				if (plat->sector->floorheight == plat->low)
					plat->status = up;
				else
					plat->status = down;
				S_StartSound((mobj_t *)&plat->sector->soundorg, sfx_pstart);
			}
		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->type = type;
		plat->sector = sec;
		plat->sector->specialdata = plat;
		plat->thinker.function = T_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;
				sec->special = 0;		// NO MORE DAMAGE, IF APPLICABLE
				S_StartSound((mobj_t *)&sec->soundorg, sfx_stnmov);
				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;
				S_StartSound((mobj_t *)&sec->soundorg, sfx_stnmov);
				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;
				S_StartSound((mobj_t *)&sec->soundorg, sfx_pstart);
				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;
				S_StartSound((mobj_t *)&sec->soundorg, sfx_pstart);
				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 = T_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 = NULL;
		}
}

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!");
}