/*
	sv_entmap.c

	(description)

	Copyright (C) 1996-1997  Id Software, Inc.

	This program 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 2
	of the License, or (at your option) any later version.

	This program 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 this program; if not, write to:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

*/
static const char rcsid[] = 
	"$Id$";

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <QF/sys.h>

#include "server.h"


/*

	SV_EntMap_Get

	Returns the network version of a given entity number for the given
	client, allocating one if necesary, or -1 if none are available.
*/
int
SV_EntMap_Get (entmap_t *entmap, int entnum)
{
	int i;

//	return entnum; // FIXME: hack hack hack

	if (entnum < 0 || entnum >= MAX_EDICTS)
		Sys_Error ("SV_EntMap_Get: invalid entnum: %d", entnum);

	i = entmap->internal[entnum];
	if (i != ENTMAP_INVALID) { // check if already mapped
		SV_EntMap_Touch (entmap, i);
		return i;
	}

	// not mapped, so try to find an available number to map to
	for (i = 0; entmap->network[i].internal != ENTMAP_INVALID; i++)
		;
	if (i == sizeof (entmap->network) / sizeof (entmap_item_t) - 1)
		return ENTMAP_INVALID; // no mappings available (ugh)

	SV_EntMap_Add (entmap, entnum, i);
	return i;
}

/*
	SV_EntMap_LookupByNetwork

	Returns the internal entity number assosiated with a network
	number, or ENTMAP_INVALID if there isn't one.
*/
int
SV_EntMap_LookupByNetwork (entmap_t *entmap, int netnum)
{
	int i;

	if (netnum < 0 || netnum >= MAX_NET_EDICTS)
		Sys_Error ("SV_EntMap_LookupByNetwork: invalid netnum: %d", netnum);

	i = entmap->network[netnum].internal;
	return i;
}

/*
	SV_EntMap_LookupByInternal

	Returns the network entity number assosiated with an internal
	number, or ENTMAP_INVALID if there isn't one.
*/
int
SV_EntMap_LookupByInternal (entmap_t *entmap, int entnum)
{
	int i;

	if (entnum < 0 || entnum >= MAX_EDICTS)
		Sys_Error ("SV_EntMap_LookupByInternal: invalid entnum: %d", entnum);

	i = entmap->internal[entnum];
	return i;
}

/*
	SV_EntMap_Init

	Initializes an entmap.  It does NOT release any previously
	allocated memory
*/
void
SV_EntMap_Init (entmap_t *entmap)
{
	int i;

	// setup world/clients
	for (i = 0; i <= MAX_CLIENTS; i++) {
		entmap->internal[i] = i;
		entmap->network[i].internal = i;
		entmap->network[i].usedtime = 0;
	}

	// clear the rest
	for (i = MAX_CLIENTS + 1; i < MAX_EDICTS; i++)
		entmap->internal[i] = ENTMAP_INVALID;
	for (i = MAX_CLIENTS + 1;
		 i < sizeof (entmap->network) / sizeof (entmap_item_t); i++) {
		entmap->network[i].internal = ENTMAP_INVALID;
		entmap->network[i].usedtime = 0;
	}
}

/*
	SV_EntMap_Copy

	Copys the contents of one entmap to another.  It does NOT release
	any previously allocated memory in the destination entmap.
*/
void
SV_EntMap_Copy (entmap_t *dest, entmap_t *src)
{
	// XXX: this'll be more useful when we dynamically allocate memory
	memcpy (dest, src, sizeof (entmap_t));
}

/*
	SV_EntMap_Delete

	Releases all memory that was allocated in the entmap
*/
void
SV_EntMap_Delete (entmap_t *entmap)
{
	// XXX: make useful
	memset (entmap, 0xAF, sizeof (entmap_t)); // for debugging
}

/*
	SV_EntMap_Add

	Makes the given network number map to the given internal number
*/
void
SV_EntMap_Add (entmap_t *entmap, int entnum, int netnum)
{
	if (entnum < 0 || entnum >= MAX_EDICTS ||
		netnum < 0 || netnum >= MAX_NET_EDICTS)
		Sys_Error ("SV_EntMap_Add: invalid entnum/netnum: %d/%d",
				   entnum, netnum);

	entmap->network[netnum].internal = entnum;
	entmap->internal[entnum] = netnum;
	entmap->network[netnum].usedtime = realtime;
}

/*
	SV_EntMap_Touch

	Updates the "last used" time on the mapping
*/
void
SV_EntMap_Touch (entmap_t *entmap, int netnum)
{
	if (netnum < 0 || netnum >= MAX_NET_EDICTS)
		Sys_Error ("SV_EntMap_Touch: invalid netnum: %d", netnum);

	if (entmap->network[netnum].internal == ENTMAP_INVALID)
		Sys_Error ("SV_EntMap_Touch: netnum not mapped: %d", netnum);

	// update the usedtime, if it's not a permanent mapping
	if (entmap->network[netnum].usedtime)
		entmap->network[netnum].usedtime = realtime;
}

/*
	SV_EntMap_Clean

	Removes all mappings that havn't been used in the given number of
	seconds
*/
void
SV_EntMap_Clean (entmap_t *entmap, float window)
{
	int i;

	for (i = MAX_CLIENTS + 1;
		 i < sizeof (entmap->network) / sizeof (entmap_item_t); i++)
		if (entmap->network[i].internal != ENTMAP_INVALID &&
			entmap->network[i].usedtime &&
			entmap->network[i].usedtime + window < realtime) {
			entmap->internal[entmap->network[i].internal] = ENTMAP_INVALID;
			entmap->network[i].internal = ENTMAP_INVALID;
			entmap->network[i].usedtime = 0;
		}
}

/*
	SV_EntMap_MakePermanent

	Makes the mapping for the given netnum permanent
*/
void
SV_EntMap_MakePermanent (entmap_t *entmap, int netnum)
{
	if (netnum < 0 || netnum >= MAX_NET_EDICTS)
		Sys_Error ("SV_EntMap_Touch: invalid netnum: %d", netnum);

	if (entmap->network[netnum].internal == ENTMAP_INVALID)
		Sys_Error ("SV_EntMap_Touch: netnum not mapped: %d", netnum);

	entmap->network[netnum].usedtime = 0;
}