/*
sv_main.c - server main loop
Copyright (C) 2007 Uncle Mike

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 3 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.
*/

#include "common.h"
#include "server.h"
#include "net_encode.h"

#define HEARTBEAT_SECONDS	300.0f 		// 300 seconds

convar_t	*sv_zmax;
convar_t	*sv_novis;			// disable server culling entities by vis
convar_t	*sv_unlag;
convar_t	*sv_maxunlag;
convar_t	*sv_unlagpush;
convar_t	*sv_unlagsamples;
convar_t	*sv_pausable;
convar_t	*sv_newunit;
convar_t	*sv_wateramp;
convar_t	*timeout;				// seconds without any message
convar_t	*zombietime;			// seconds to sink messages after disconnect
convar_t	*rcon_password;			// password for remote server commands
convar_t	*sv_airaccelerate;
convar_t	*sv_wateraccelerate;
convar_t	*sv_maxvelocity;
convar_t	*sv_gravity;
convar_t	*sv_stepsize;
convar_t	*sv_rollangle;
convar_t	*sv_rollspeed;
convar_t	*sv_wallbounce;
convar_t	*sv_maxspeed;
convar_t	*sv_spectatormaxspeed;
convar_t	*sv_accelerate;
convar_t	*sv_friction;
convar_t	*sv_edgefriction;
convar_t	*sv_waterfriction;
convar_t	*sv_stopspeed;
convar_t	*hostname;
convar_t	*sv_lighting_modulate;
convar_t	*sv_maxclients;
convar_t	*sv_check_errors;
convar_t	*sv_footsteps;
convar_t	*public_server;			// should heartbeats be sent
convar_t	*sv_reconnect_limit;		// minimum seconds between connect messages
convar_t	*sv_failuretime;
convar_t	*sv_allow_upload;
convar_t	*sv_allow_download;
convar_t	*sv_allow_studio_attachment_angles;
convar_t	*sv_allow_rotate_pushables;
convar_t	*sv_validate_changelevel;
convar_t	*sv_clienttrace;
convar_t	*sv_send_resources;
convar_t	*sv_send_logos;
convar_t	*sv_sendvelocity;
convar_t	*sv_airmove;
convar_t	*sv_quakehulls;
convar_t	*mp_consistency;
convar_t	*serverinfo;
convar_t	*physinfo;
convar_t	*clockwindow;
convar_t	*deathmatch;
convar_t	*teamplay;
convar_t	*skill;
convar_t	*coop;

// sky variables
convar_t	*sv_skycolor_r;
convar_t	*sv_skycolor_g;
convar_t	*sv_skycolor_b;
convar_t	*sv_skyvec_x;
convar_t	*sv_skyvec_y;
convar_t	*sv_skyvec_z;
convar_t	*sv_skyname;
convar_t	*sv_wateralpha;
convar_t	*sv_skydir_x;
convar_t	*sv_skydir_y;
convar_t	*sv_skydir_z;
convar_t	*sv_skyangle;
convar_t	*sv_skyspeed;

void Master_Shutdown( void );

//============================================================================

/*
===================
SV_CalcPings

Updates the cl->ping variables
===================
*/
void SV_CalcPings( void )
{
	sv_client_t	*cl;
	int		i, j;
	int		total, count;

	if( !svs.clients ) return;

	// clamp fps counter
	for( i = 0; i < sv_maxclients->integer; i++ )
	{
		cl = &svs.clients[i];

		if( cl->state != cs_spawned || cl->fakeclient )
			continue;

		total = count = 0;

		for( j = 0; j < (SV_UPDATE_BACKUP / 2); j++ )
		{
			client_frame_t	*frame;

			frame = &cl->frames[(cl->netchan.incoming_acknowledged - (j + 1)) & SV_UPDATE_MASK];
			if( frame->latency > 0 )
			{
				count++;
				total += frame->latency;
			}
		}

		if( !count ) cl->ping = 0;
		else cl->ping = total / count;
	}
}

/*
===================
SV_CalcPacketLoss

determine % of packets that were not ack'd.
===================
*/
int SV_CalcPacketLoss( sv_client_t *cl )
{
	int	i, lost, count;
	float	losspercent;
	register client_frame_t *frame;
	int	numsamples;

	lost  = 0;
	count = 0;

	if( cl->fakeclient )
		return 0;

	numsamples = SV_UPDATE_BACKUP / 2;

	for( i = 0; i < numsamples; i++ )
	{
		frame = &cl->frames[(cl->netchan.incoming_acknowledged - 1 - i) & SV_UPDATE_MASK];
		count++;
		if( frame->latency == -1 )
			lost++;
	}

	if( !count ) return 100;
	losspercent = 100.0f * ( float )lost / ( float )count;

	return (int)losspercent;
}

/*
================
SV_HasActivePlayers

returns true if server have spawned players
================
*/
qboolean SV_HasActivePlayers( void )
{
	int	i;

	// server inactive
	if( !svs.clients ) return false;

	for( i = 0; i < sv_maxclients->integer; i++ )
	{
		if( svs.clients[i].state == cs_spawned )
			return true;
	}
	return false;
}

/*
===================
SV_UpdateMovevars

check movevars for changes every frame
send updates to client if changed
===================
*/
void SV_UpdateMovevars( qboolean initialize )
{
	if( !initialize && !physinfo->modified )
		return;

	// check range
	if( sv_zmax->value < 256.0f ) Cvar_SetFloat( "sv_zmax", 256.0f );
	if( sv_zmax->value > 32767.0f ) Cvar_SetFloat( "sv_zmax", 32767.0f );

	svgame.movevars.gravity = sv_gravity->value;
	svgame.movevars.stopspeed = sv_stopspeed->value;
	svgame.movevars.maxspeed = sv_maxspeed->value;
	svgame.movevars.spectatormaxspeed = sv_spectatormaxspeed->value;
	svgame.movevars.accelerate = sv_accelerate->value;
	svgame.movevars.airaccelerate = sv_airaccelerate->value;
	svgame.movevars.wateraccelerate = sv_wateraccelerate->value;
	svgame.movevars.friction = sv_friction->value;
	svgame.movevars.edgefriction = sv_edgefriction->value;
	svgame.movevars.waterfriction = sv_waterfriction->value;
	svgame.movevars.bounce = sv_wallbounce->value;
	svgame.movevars.stepsize = sv_stepsize->value;
	svgame.movevars.maxvelocity = sv_maxvelocity->value;
	svgame.movevars.zmax = sv_zmax->value;
	svgame.movevars.waveHeight = sv_wateramp->value;
	Q_strncpy( svgame.movevars.skyName, sv_skyname->string, sizeof( svgame.movevars.skyName ));
	svgame.movevars.footsteps = sv_footsteps->integer;
	svgame.movevars.rollangle = sv_rollangle->value;
	svgame.movevars.rollspeed = sv_rollspeed->value;
	svgame.movevars.skycolor_r = sv_skycolor_r->value;
	svgame.movevars.skycolor_g = sv_skycolor_g->value;
	svgame.movevars.skycolor_b = sv_skycolor_b->value;
	svgame.movevars.skyvec_x = sv_skyvec_x->value;
	svgame.movevars.skyvec_y = sv_skyvec_y->value;
	svgame.movevars.skyvec_z = sv_skyvec_z->value;
	svgame.movevars.skydir_x = sv_skydir_x->value;
	svgame.movevars.skydir_y = sv_skydir_y->value;
	svgame.movevars.skydir_z = sv_skydir_z->value;
	svgame.movevars.skyangle = sv_skyangle->value;
	svgame.movevars.wateralpha = sv_wateralpha->value;
	svgame.movevars.features = host.features; // just in case. not really need

	if( initialize ) return; // too early

	if( MSG_WriteDeltaMovevars( &sv.reliable_datagram, &svgame.oldmovevars, &svgame.movevars ))
		Q_memcpy( &svgame.oldmovevars, &svgame.movevars, sizeof( movevars_t )); // oldstate changed

	physinfo->modified = false;
}

void pfnUpdateServerInfo( const char *szKey, const char *szValue, const char *unused, void *unused2 )
{
	convar_t	*cv = Cvar_FindVar( szKey );

	if( !cv || !cv->modified ) return; // this cvar not changed

	BF_WriteByte( &sv.reliable_datagram, svc_serverinfo );
	BF_WriteString( &sv.reliable_datagram, szKey );
	BF_WriteString( &sv.reliable_datagram, szValue );
	cv->modified = false; // reset state
}

void SV_UpdateServerInfo( void )
{
	if( !serverinfo->modified ) return;

	Cvar_LookupVars( CVAR_SERVERINFO, NULL, NULL, pfnUpdateServerInfo ); 

	serverinfo->modified = false;
}

/*
=================
SV_CheckCmdTimes
=================
*/
void SV_CheckCmdTimes( void )
{
	sv_client_t	*cl;
	static double	lastreset = 0;
	double		timewindow;
	int		i;

	if(( host.realtime - lastreset ) < 1.0 )
		return;

	lastreset = host.realtime;

	for( i = 0, cl = svs.clients; i < sv_maxclients->integer; i++, cl++ )
	{
		if( cl->state != cs_spawned )
			continue;

		if( cl->last_cmdtime == 0.0 )
		{
			cl->last_cmdtime = host.realtime;
		}

		timewindow = cl->last_movetime + cl->last_cmdtime - host.realtime;

		if( timewindow > clockwindow->value )
		{
			cl->next_movetime = clockwindow->value + host.realtime;
			cl->last_movetime = host.realtime - cl->last_cmdtime;
		}
		else if( timewindow < -clockwindow->value )
		{
			cl->last_movetime = host.realtime - cl->last_cmdtime;
		}
	}
}

/*
=================
SV_ReadPackets
=================
*/
void SV_ReadPackets( void )
{
	sv_client_t	*cl;
	int		i, qport, curSize;

	while( NET_GetPacket( NS_SERVER, &net_from, net_message_buffer, &curSize ))
	{
		BF_Init( &net_message, "ClientPacket", net_message_buffer, curSize );

		// check for connectionless packet (0xffffffff) first
		if( BF_GetMaxBytes( &net_message ) >= 4 && *(int *)net_message.pData == -1 )
		{
			SV_ConnectionlessPacket( net_from, &net_message );
			continue;
		}

		// read the qport out of the message so we can fix up
		// stupid address translating routers
		BF_Clear( &net_message );
		BF_ReadLong( &net_message );	// sequence number
		BF_ReadLong( &net_message );	// sequence number
		qport = (int)BF_ReadShort( &net_message ) & 0xffff;

		// check for packets from connected clients
		for( i = 0, cl = svs.clients; i < sv_maxclients->integer; i++, cl++ )
		{
			if( cl->state == cs_free || cl->fakeclient )
				continue;

			if( !NET_CompareBaseAdr( net_from, cl->netchan.remote_address ))
				continue;

			if( cl->netchan.qport != qport )
				continue;

			if( cl->netchan.remote_address.port != net_from.port )
			{
				MsgDev( D_INFO, "SV_ReadPackets: fixing up a translated port\n");
				cl->netchan.remote_address.port = net_from.port;
			}

			if( Netchan_Process( &cl->netchan, &net_message ))
			{	
				cl->send_message = true; // reply at end of frame

				// this is a valid, sequenced packet, so process it
				if( cl->state != cs_zombie )
				{
					cl->lastmessage = host.realtime; // don't timeout
					SV_ExecuteClientMessage( cl, &net_message );
					svgame.globals->frametime = host.frametime;
					svgame.globals->time = sv.time;
				}
			}

			// fragmentation/reassembly sending takes priority over all game messages, want this in the future?
			if( Netchan_IncomingReady( &cl->netchan ))
			{
				if( Netchan_CopyNormalFragments( &cl->netchan, &net_message ))
				{
					BF_Clear( &net_message );
					SV_ExecuteClientMessage( cl, &net_message );
				}

				if( Netchan_CopyFileFragments( &cl->netchan, &net_message ))
				{
					SV_ProcessFile( cl, cl->netchan.incomingfilename );
				}
			}
			break;
		}

		if( i != sv_maxclients->integer )
			continue;
	}
}

/*
==================
SV_CheckTimeouts

If a packet has not been received from a client for timeout->value
seconds, drop the conneciton.  Server frames are used instead of
realtime to avoid dropping the local client while debugging.

When a client is normally dropped, the sv_client_t goes into a zombie state
for a few seconds to make sure any final reliable message gets resent
if necessary
==================
*/
void SV_CheckTimeouts( void )
{
	sv_client_t	*cl;
	float		droppoint;
	float		zombiepoint;
	int		i, numclients = 0;

	droppoint = host.realtime - timeout->value;
	zombiepoint = host.realtime - zombietime->value;

	for( i = 0, cl = svs.clients; i < sv_maxclients->integer; i++, cl++ )
	{
		if( cl->state >= cs_connected )
		{
			if( cl->edict && !( cl->edict->v.flags & (FL_SPECTATOR|FL_FAKECLIENT)))
				numclients++;
                    }

		// fake clients do not timeout
		if( cl->fakeclient ) cl->lastmessage = host.realtime;

		// message times may be wrong across a changelevel
		if( cl->lastmessage > host.realtime )
			cl->lastmessage = host.realtime;

		if( cl->state == cs_zombie && cl->lastmessage < zombiepoint )
		{
			cl->state = cs_free; // can now be reused
			continue;
		}

		if(( cl->state == cs_connected || cl->state == cs_spawned ) && cl->lastmessage < droppoint )
		{
			SV_BroadcastPrintf( PRINT_HIGH, "%s timed out\n", cl->name );
			SV_DropClient( cl ); 
			cl->state = cs_free; // don't bother with zombie state
		}
	}

	if( sv.paused && !numclients )
	{
		// nobody left, unpause the server
		SV_TogglePause( "Pause released since no players are left." );
	}
}

/*
================
SV_PrepWorldFrame

This has to be done before the world logic, because
player processing happens outside RunWorldFrame
================
*/
void SV_PrepWorldFrame( void )
{
	edict_t	*ent;
	int	i;

	for( i = 1; i < svgame.numEntities; i++ )
	{
		ent = EDICT_NUM( i );
		if( ent->free ) continue;

		ent->v.effects &= ~(EF_MUZZLEFLASH|EF_NOINTERP);
	}
}

/*
=================
SV_ProcessFile
=================
*/
void SV_ProcessFile( sv_client_t *cl, char *filename )
{
	// some other file...
	MsgDev( D_INFO, "Received file %s from %s\n", filename, cl->name );
}

/*
=================
SV_IsSimulating
=================
*/
qboolean SV_IsSimulating( void )
{
	if( sv.background && SV_Active() && CL_Active())
	{
		if( CL_IsInConsole( ))
			return false;
		return true; // force simulating for background map
	}

	if( sv.hostflags & SVF_PLAYERSONLY )
		return false;
	if( !SV_HasActivePlayers())
		return false;
	if( !sv.paused && CL_IsInGame( ))
		return true;
	return false;
}

/*
=================
SV_RunGameFrame
=================
*/
void SV_RunGameFrame( void )
{
	if( !SV_IsSimulating( )) return;

	SV_Physics();

	sv.time += host.frametime;
}

/*
==================
Host_ServerFrame

==================
*/
void Host_ServerFrame( void )
{
	// if server is not active, do nothing
	if( !svs.initialized ) return;

	svgame.globals->frametime = host.frametime;

	// check timeouts
	SV_CheckTimeouts ();

	// check clients timewindow
	SV_CheckCmdTimes ();

	// read packets from clients
	SV_ReadPackets ();

	// update ping based on the last known frame from all clients
	SV_CalcPings ();

	// refresh serverinfo on the client side
	SV_UpdateServerInfo ();

	// refresh physic movevars on the client side
	SV_UpdateMovevars ( false );

	// let everything in the world think and move
	SV_RunGameFrame ();
		
	// send messages back to the clients that had packets read this frame
	SV_SendClientMessages ();

	// clear edict flags for next frame
	SV_PrepWorldFrame ();

	// send a heartbeat to the master if needed
	Master_Heartbeat ();
}

//============================================================================

/*
=================
Master_Add
=================
*/
void Master_Add( void )
{
	netadr_t	adr;

	NET_Config( true ); // allow remote

	if( !NET_StringToAdr( MASTERSERVER_ADR, &adr ))
		MsgDev( D_INFO, "Can't resolve adr: %s\n", MASTERSERVER_ADR );

	NET_SendPacket( NS_SERVER, 2, "\x4D\xFF", adr );
}

/*
================
Master_Heartbeat

Send a message to the master every few minutes to
let it know we are alive, and log information
================
*/
void Master_Heartbeat( void )
{
	if( !public_server->integer || sv_maxclients->integer == 1 )
		return; // only public servers send heartbeats

	// check for time wraparound
	if( svs.last_heartbeat > host.realtime )
		svs.last_heartbeat = host.realtime;

	if(( host.realtime - svs.last_heartbeat ) < HEARTBEAT_SECONDS )
		return; // not time to send yet

	svs.last_heartbeat = host.realtime;

	Master_Add();
}

/*
=================
Master_Shutdown

Informs all masters that this server is going down
=================
*/
void Master_Shutdown( void )
{
}

//============================================================================

/*
===============
SV_Init

Only called at startup, not for each game
===============
*/
void SV_Init( void )
{
	SV_InitOperatorCommands();

	skill = Cvar_Get ("skill", "1", CVAR_LATCH, "game skill level" );
	deathmatch = Cvar_Get ("deathmatch", "0", CVAR_LATCH|CVAR_SERVERINFO, "displays deathmatch state" );
	teamplay = Cvar_Get ("teamplay", "0", CVAR_LATCH|CVAR_SERVERINFO, "displays teamplay state" );
	coop = Cvar_Get ("coop", "0", CVAR_LATCH|CVAR_SERVERINFO, "displays cooperative state" );
	Cvar_Get ("protocol", va( "%i", PROTOCOL_VERSION ), CVAR_INIT, "displays server protocol version" );
	Cvar_Get ("defaultmap", "", CVAR_SERVERNOTIFY, "holds the multiplayer mapname" );
	Cvar_Get ("showtriggers", "0", CVAR_LATCH, "debug cvar shows triggers" );
	Cvar_Get ("sv_aim", "0", CVAR_ARCHIVE, "enable auto-aiming" );
	Cvar_Get ("mapcyclefile", "mapcycle.txt", 0, "name of multiplayer map cycle configuration file" );
	Cvar_Get ("servercfgfile","server.cfg", 0, "name of dedicated server configuration file" );
	Cvar_Get ("lservercfgfile","listenserver.cfg", 0, "name of listen server configuration file" );
	Cvar_Get ("motdfile", "motd.txt", 0, "name of 'message of the day' file" );
	Cvar_Get ("sv_language", "0", 0, "game language (currently unused)" );
	Cvar_Get ("suitvolume", "0.25", CVAR_ARCHIVE, "HEV suit volume" );
	Cvar_Get ("sv_background", "0", CVAR_READ_ONLY, "indicate what background map is running" );
	Cvar_Get( "gamedir", GI->gamefolder, CVAR_SERVERINFO|CVAR_SERVERNOTIFY|CVAR_INIT, "game folder" );
	Cvar_Get( "sv_alltalk", "1", 0, "allow to talking for all players (legacy, unused)" );
	Cvar_Get( "sv_airmove", "1", CVAR_SERVERNOTIFY, "enable airmovement (legacy, unused)" );
	Cvar_Get( "mp_autocrosshair", "0", 0, "allow auto crosshair in multiplayer (legacy, unused)" );
		
	// half-life shared variables
	sv_zmax = Cvar_Get ("sv_zmax", "4096", CVAR_PHYSICINFO, "zfar server value" );
	sv_wateramp = Cvar_Get ("sv_wateramp", "0", CVAR_PHYSICINFO, "global water wave height" );
	sv_skycolor_r = Cvar_Get ("sv_skycolor_r", "255", CVAR_PHYSICINFO, "skycolor red" );
	sv_skycolor_g = Cvar_Get ("sv_skycolor_g", "255", CVAR_PHYSICINFO, "skycolor green" );
	sv_skycolor_b = Cvar_Get ("sv_skycolor_b", "255", CVAR_PHYSICINFO, "skycolor blue" );
	sv_skyvec_x = Cvar_Get ("sv_skyvec_x", "0", CVAR_PHYSICINFO, "skylight direction x" );
	sv_skyvec_y = Cvar_Get ("sv_skyvec_y", "0", CVAR_PHYSICINFO, "skylight direction y" );
	sv_skyvec_z = Cvar_Get ("sv_skyvec_z", "0", CVAR_PHYSICINFO, "skylight direction z" );
	sv_skyname = Cvar_Get ("sv_skyname", "desert", CVAR_PHYSICINFO, "skybox name (can be dynamically changed in-game)" );
	sv_skydir_x = Cvar_Get ("sv_skydir_x", "0", CVAR_PHYSICINFO, "sky rotation direction x" );
	sv_skydir_y = Cvar_Get ("sv_skydir_y", "0", CVAR_PHYSICINFO, "sky rotation direction y" );
	sv_skydir_z = Cvar_Get ("sv_skydir_z", "1", CVAR_PHYSICINFO, "sky rotation direction z" ); // g-cont. add default sky rotate direction
	sv_skyangle = Cvar_Get ("sv_skyangle", "0", CVAR_PHYSICINFO, "skybox rotational angle (in degrees)" );
	sv_skyspeed = Cvar_Get ("sv_skyspeed", "0", 0, "skybox rotational speed" );
	sv_footsteps = Cvar_Get ("mp_footsteps", "1", CVAR_PHYSICINFO, "can hear footsteps from other players" );
	sv_wateralpha = Cvar_Get ("sv_wateralpha", "1", CVAR_PHYSICINFO, "world surfaces water transparency factor. 1.0 - solid, 0.0 - fully transparent" );

	rcon_password = Cvar_Get( "rcon_password", "", 0, "remote connect password" );
	sv_stepsize = Cvar_Get( "sv_stepsize", "18", CVAR_ARCHIVE|CVAR_PHYSICINFO, "how high you can step up" );
	sv_newunit = Cvar_Get( "sv_newunit", "0", 0, "sets to 1 while new unit is loading" );
	hostname = Cvar_Get( "hostname", "unnamed", CVAR_SERVERNOTIFY|CVAR_SERVERNOTIFY|CVAR_ARCHIVE, "host name" );
	timeout = Cvar_Get( "timeout", "125", CVAR_SERVERNOTIFY, "connection timeout" );
	zombietime = Cvar_Get( "zombietime", "2", CVAR_SERVERNOTIFY, "timeout for clients-zombie (who died but not respawned)" );
	sv_pausable = Cvar_Get( "pausable", "1", CVAR_SERVERNOTIFY, "allow players to pause or not" );
	sv_allow_studio_attachment_angles = Cvar_Get( "sv_allow_studio_attachment_angles", "0", CVAR_ARCHIVE, "enable calc angles for attachment points (on studio models)" );
	sv_allow_rotate_pushables = Cvar_Get( "sv_allow_rotate_pushables", "0", CVAR_ARCHIVE, "let the pushers rotate pushables with included origin-brush" );
	sv_validate_changelevel = Cvar_Get( "sv_validate_changelevel", "1", CVAR_ARCHIVE, "test change level for level-designer errors" );
	sv_clienttrace = Cvar_Get( "sv_clienttrace", "1", CVAR_SERVERNOTIFY, "scaling factor for client hitboxes" );
	sv_wallbounce = Cvar_Get( "sv_wallbounce", "1.0", CVAR_PHYSICINFO, "bounce factor for client with MOVETYPE_BOUNCE" );
	sv_spectatormaxspeed = Cvar_Get( "sv_spectatormaxspeed", "500", CVAR_PHYSICINFO, "spectator maxspeed" );
	sv_waterfriction = Cvar_Get( "sv_waterfriction", "1", CVAR_PHYSICINFO, "how fast you slow down in water" );
	sv_wateraccelerate = Cvar_Get( "sv_wateraccelerate", "10", CVAR_PHYSICINFO, "rate at which a player accelerates to sv_maxspeed while in the water" );
	sv_rollangle = Cvar_Get( "sv_rollangle", "0", CVAR_PHYSICINFO, "how much to tilt the view when strafing" );
	sv_rollspeed = Cvar_Get( "sv_rollspeed", "200", CVAR_PHYSICINFO, "how much strafing is necessary to tilt the view" );
	sv_airaccelerate = Cvar_Get("sv_airaccelerate", "10", CVAR_PHYSICINFO, "player accellerate in air" );
	sv_maxvelocity = Cvar_Get( "sv_maxvelocity", "2000", CVAR_PHYSICINFO, "max world velocity" );
          sv_gravity = Cvar_Get( "sv_gravity", "800", CVAR_PHYSICINFO, "world gravity" );
	sv_maxspeed = Cvar_Get( "sv_maxspeed", "320", CVAR_PHYSICINFO, "maximum speed a player can accelerate to when on ground");
	sv_accelerate = Cvar_Get( "sv_accelerate", "10", CVAR_PHYSICINFO, "rate at which a player accelerates to sv_maxspeed" );
	sv_friction = Cvar_Get( "sv_friction", "4", CVAR_PHYSICINFO, "how fast you slow down" );
	sv_edgefriction = Cvar_Get( "edgefriction", "2", CVAR_PHYSICINFO, "how much you slow down when nearing a ledge you might fall off" );
	sv_stopspeed = Cvar_Get( "sv_stopspeed", "100", CVAR_PHYSICINFO, "how fast you come to a complete stop" );
	sv_maxclients = Cvar_Get( "maxplayers", "1", CVAR_LATCH|CVAR_SERVERNOTIFY, "server clients limit" );
	sv_check_errors = Cvar_Get( "sv_check_errors", "0", CVAR_ARCHIVE, "check edicts for errors" );
	physinfo = Cvar_Get( "@physinfo", "0", CVAR_READ_ONLY, "" ); // use ->modified value only
	serverinfo = Cvar_Get( "@serverinfo", "0", CVAR_READ_ONLY, "" ); // use ->modified value only
	public_server = Cvar_Get ("public", "0", 0, "change server type from private to public" );
	sv_lighting_modulate = Cvar_Get( "r_lighting_modulate", "0.6", CVAR_ARCHIVE, "lightstyles modulate scale" );
	sv_reconnect_limit = Cvar_Get ("sv_reconnect_limit", "3", CVAR_ARCHIVE, "max reconnect attempts" );
	sv_failuretime = Cvar_Get( "sv_failuretime", "0.5", 0, "after this long without a packet from client, don't send any more until client starts sending again" );
	sv_unlag = Cvar_Get( "sv_unlag", "1", 0, "allow lag compensation on server-side" );
	sv_maxunlag = Cvar_Get( "sv_maxunlag", "0.5", 0, "max latency which can be interpolated" );
	sv_unlagpush = Cvar_Get( "sv_unlagpush", "0.0", 0, "unlag push bias" );
	sv_unlagsamples = Cvar_Get( "sv_unlagsamples", "1", 0, "max samples to interpolate" );
	sv_allow_upload = Cvar_Get( "sv_allow_upload", "1", 0, "allow uploading custom resources from clients" );
	sv_allow_download = Cvar_Get( "sv_allow_download", "1", 0, "allow download missed resources to clients" );
	sv_send_logos = Cvar_Get( "sv_send_logos", "1", 0, "send custom player decals to other clients" );
	sv_send_resources = Cvar_Get( "sv_send_resources", "1", 0, "send generic resources that specified in 'mapname.res'" );
	sv_sendvelocity = Cvar_Get( "sv_sendvelocity", "1", CVAR_ARCHIVE, "force to send velocity for event_t structure across network" );
	sv_quakehulls = Cvar_Get( "sv_quakehulls", "0", CVAR_ARCHIVE, "using quake style hull select instead of half-life style hull select" );
	mp_consistency = Cvar_Get( "mp_consistency", "1", CVAR_SERVERNOTIFY, "enbale consistency check in multiplayer" );
	clockwindow = Cvar_Get( "clockwindow", "0.5", 0, "timewindow to execute client moves" );
	sv_novis = Cvar_Get( "sv_novis", "0", 0, "force to ignore server visibility" );

	SV_ClearSaveDir ();	// delete all temporary *.hl files
	BF_Init( &net_message, "NetMessage", net_message_buffer, sizeof( net_message_buffer ));
}

/*
==================
SV_FinalMessage

Used by SV_Shutdown to send a final message to all
connected clients before the server goes down.  The messages are sent immediately,
not just stuck on the outgoing message list, because the server is going
to totally exit after returning from this function.
==================
*/
void SV_FinalMessage( char *message, qboolean reconnect )
{
	sv_client_t	*cl;
	byte		msg_buf[1024];
	sizebuf_t		msg;
	int		i;
	
	BF_Init( &msg, "FinalMessage", msg_buf, sizeof( msg_buf ));
	BF_WriteByte( &msg, svc_print );
	BF_WriteByte( &msg, PRINT_HIGH );
	BF_WriteString( &msg, va( "%s\n", message ));

	if( reconnect )
	{
		BF_WriteByte( &msg, svc_changing );

		if( sv.loadgame || sv_maxclients->integer > 1 || sv.changelevel )
			BF_WriteOneBit( &msg, 1 ); // changelevel
		else BF_WriteOneBit( &msg, 0 );
	}
	else
	{
		BF_WriteByte( &msg, svc_disconnect );
	}

	// send it twice
	// stagger the packets to crutch operating system limited buffers
	for( i = 0, cl = svs.clients; i < sv_maxclients->integer; i++, cl++ )
		if( cl->state >= cs_connected && !cl->fakeclient )
			Netchan_Transmit( &cl->netchan, BF_GetNumBytesWritten( &msg ), BF_GetData( &msg ));

	for( i = 0, cl = svs.clients; i < sv_maxclients->integer; i++, cl++ )
		if( cl->state >= cs_connected && !cl->fakeclient )
			Netchan_Transmit( &cl->netchan, BF_GetNumBytesWritten( &msg ), BF_GetData( &msg ));
}

/*
================
SV_Shutdown

Called when each game quits,
before Sys_Quit or Sys_Error
================
*/
void SV_Shutdown( qboolean reconnect )
{
	// already freed
	if( !SV_Active( )) return;

	if( host.type == HOST_DEDICATED ) MsgDev( D_INFO, "SV_Shutdown: %s\n", host.finalmsg );
	if( svs.clients ) SV_FinalMessage( host.finalmsg, reconnect );

	Master_Shutdown();

	if( !reconnect ) SV_UnloadProgs ();
	else SV_DeactivateServer ();

	// free current level
	Q_memset( &sv, 0, sizeof( sv ));
	Host_SetServerState( sv.state );

	// free server static data
	if( svs.clients )
	{
		Z_Free( svs.clients );
		svs.clients = NULL;
	}

	if( svs.baselines )
	{
		Z_Free( svs.baselines );
		svs.baselines = NULL;
	}

	if( svs.packet_entities )
	{
		Z_Free( svs.packet_entities );
		svs.packet_entities = NULL;
		svs.num_client_entities = 0;
		svs.next_client_entities = 0;
	}

	svs.initialized = false;
}