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

*/
// sv_main.c -- server main program

#include "quakedef.h"

server_t	sv;
server_static_t	svs;
int		sv_max_datagram = MAX_DATAGRAM; // Must be set so client will work without server

char	localmodels[MAX_MODELS][6]; // "*1023" //5 "*255"		// inline model names for precache

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

/*
===============
SV_SetProtocol_f
===============
*/
static int sv_protocol = PROTOCOL_VERSION_BJP3;

static void SV_SetProtocol_f (void)
{
	if (Cmd_Argc() == 1)
	{
		Con_Printf ("sv_protocol is %d\n", sv_protocol);
		return;
	}

	sv_protocol = Q_atoi (Cmd_Argv(1));
}

/*
===============
SV_Init
===============
*/
void SV_Init (void)
{
	int		i;
	extern	cvar_t	sv_maxvelocity;
	extern	cvar_t	sv_gravity;
	extern	cvar_t	sv_nostep;
	extern	cvar_t	sv_friction;
	extern	cvar_t	sv_edgefriction;
	extern	cvar_t	sv_stopspeed;
	extern	cvar_t	sv_maxspeed;
	extern	cvar_t	sv_accelerate;
	extern	cvar_t	sv_idealpitchscale;
	extern	cvar_t	sv_aim;
	extern	cvar_t	sv_altnoclip;

	Cvar_RegisterVariable (&sv_maxvelocity);
	Cvar_RegisterVariable (&sv_gravity);
	Cvar_RegisterVariable (&sv_friction);
	Cvar_RegisterVariable (&sv_edgefriction);
	Cvar_RegisterVariable (&sv_stopspeed);
	Cvar_RegisterVariable (&sv_maxspeed);
	Cvar_RegisterVariable (&sv_accelerate);
	Cvar_RegisterVariable (&sv_idealpitchscale);
	Cvar_RegisterVariable (&sv_aim);
	Cvar_RegisterVariable (&sv_nostep);
	Cvar_RegisterVariable (&sv_altnoclip);
	
	Cmd_AddCommand ("sv_protocol", &SV_SetProtocol_f);

	for (i=0 ; i<MAX_MODELS ; i++)
		sprintf (localmodels[i], "*%i", i);
}

/*
===============
SV_IsPaused
===============
*/
qboolean SV_IsPaused (void)
{
	return sv.paused || svs.maxclients == 1 && key_dest != key_game;
}

/*
=============================================================================

EVENT MESSAGES

=============================================================================
*/

/*
==================
SV_StartParticle

Make sure the event gets sent to all clients
==================
*/
void SV_StartParticle (vec3_t org, vec3_t dir, int color, int count)
{
	int		i, v;

	if (sv.datagram.cursize > MAX_DATAGRAM2-16)
		return;
	MSG_WriteByte (&sv.datagram, svc_particle);
	MSG_WriteCoord (&sv.datagram, org[0]);
	MSG_WriteCoord (&sv.datagram, org[1]);
	MSG_WriteCoord (&sv.datagram, org[2]);
	for (i=0 ; i<3 ; i++)
	{
		v = dir[i]*16;
		if (v > 127)
			v = 127;
		else if (v < -128)
			v = -128;
		MSG_WriteChar (&sv.datagram, v);
	}
	MSG_WriteByte (&sv.datagram, count);
	MSG_WriteByte (&sv.datagram, color);
}

/*
==================
SV_WriteByteShort2
==================
*/
void SV_WriteByteShort2 (sizebuf_t *sb, int c, qboolean Compatibility)
{
	if (sv.Protocol < PROTOCOL_VERSION_BJP2 || Compatibility && sv.Protocol > PROTOCOL_VERSION_BJP2)
		MSG_WriteByte (sb, c); // Some progs (Marcher) send sound services, maintain compatibility, kludge
	else
		MSG_WriteShort (sb, c);
}

/*
==================
SV_StartSound

Each entity can have eight independant sound sources, like voice,
weapon, feet, etc.

Channel 0 is an auto-allocate channel, the others override anything
allready running on that entity/channel pair.

An attenuation of 0 will play full volume everywhere in the level.
Larger attenuations will drop off.  (max 4 attenuation)

==================
*/
void SV_StartSound (edict_t *entity, int channel, char *sample, int volume,
    float attenuation)
{
	int          sound_num;
	int	     field_mask;
	int	     i;
	int	     ent;
	static float lastmsg = 0;

	if (volume < 0 || volume > 255)
	{
		Con_Printf ("SV_StartSound: volume = %d, max = %d\n", volume, 255);
		return;
	}

	if (attenuation < 0 || attenuation > 4)
	{
		Con_Printf ("SV_StartSound: attenuation = %g, max = %d\n", attenuation, 4);
		return;
	}

	if (channel < 0 || channel > 7)
	{
		Con_Printf ("SV_StartSound: channel = %i, max = %d\n", channel, 7);
		return;
	}

	if (sv.datagram.cursize > MAX_DATAGRAM2-16)
		return;

// find precache number for sound
	for (sound_num=1 ; sound_num<MAX_SOUNDS
	    && sv.sound_precache[sound_num] ; sound_num++)
		if (!strcmp(sample, sv.sound_precache[sound_num]))
			break;

	if ( sound_num == MAX_SOUNDS || !sv.sound_precache[sound_num] )
	{
		if (IsTimeout (&lastmsg, 2))
		{
			// Don't print stack on the common missing quad sound in godmode ...
			if (developer.value > 1 && !(sv_player && ((int)sv_player->v.flags & FL_GODMODE) && !strcmp(sample, "items/damage2.wav")))
				PR_RunError3 ();

			Con_Printf ("SV_StartSound: %s from %s not precached\n", *sample ? sample : "<empty>", ED_DbgEdict (&entity->v));
		}

		return;
	}

	ent = NUM_FOR_EDICT("SV_StartSound", entity);

	channel = (ent<<3) | channel;

	field_mask = 0;
	if (volume != DEFAULT_SOUND_PACKET_VOLUME)
		field_mask |= SND_VOLUME;
	if (attenuation != DEFAULT_SOUND_PACKET_ATTENUATION)
		field_mask |= SND_ATTENUATION;

// directed messages go only to the entity the are targeted on
	MSG_WriteByte (&sv.datagram, svc_sound);
	MSG_WriteByte (&sv.datagram, field_mask);
	if (field_mask & SND_VOLUME)
		MSG_WriteByte (&sv.datagram, volume);
	if (field_mask & SND_ATTENUATION)
		MSG_WriteByte (&sv.datagram, attenuation*64);
	MSG_WriteShort (&sv.datagram, channel);
	SV_WriteByteShort2 (&sv.datagram, sound_num, false);
	for (i=0 ; i<3 ; i++)
		MSG_WriteCoord (&sv.datagram, entity->v.origin[i]+0.5*(entity->v.mins[i]+entity->v.maxs[i]));
}

/*
==============================================================================

CLIENT SPAWNING

==============================================================================
*/

/*
==================
SV_WriteByteShort
==================
*/
void SV_WriteByteShort (sizebuf_t *sb, int c)
{
	int PrevSize = sv.signon.cursize;

	if (sv.Protocol == PROTOCOL_VERSION)
		MSG_WriteByte (sb, c);
	else
		MSG_WriteShort (sb, c); // PROTOCOL_VERSION_BJP-3

	if (sb == &sv.signon)
		sv.signondiff += sv.signon.cursize - (PrevSize + 1); // Track extra bytes due to >256 model support, kludge
}

/*
================
SV_SendServerinfo

Sends the first message from the server to a connected client.
This will be sent on the initial connection and upon each server load.
================
*/
void SV_SendServerinfo (client_t *client)
{
	char **s;
	char message[2048];

	MSG_WriteByte (&client->message, svc_print);
	sprintf (message, "%c\nVERSION %4.2f SERVER (%i CRC)", 2, VERSION, pr_crc);
	MSG_WriteString (&client->message,message);

	MSG_WriteByte (&client->message, svc_serverinfo);
	MSG_WriteLong (&client->message, sv.Protocol);
	MSG_WriteByte (&client->message, svs.maxclients);

	if (!coop.value && deathmatch.value)
		MSG_WriteByte (&client->message, GAME_DEATHMATCH);
	else
		MSG_WriteByte (&client->message, GAME_COOP);

	COM_snprintf ("SV_SendServerinfo", message, sizeof(message) - 1, pr_String("SV_SendServerinfo", sv.edicts->v.message));

	MSG_WriteString (&client->message,message);

	for (s = sv.model_precache+1 ; *s ; s++)
		MSG_WriteString (&client->message, *s);
	MSG_WriteByte (&client->message, 0);

	for (s = sv.sound_precache+1 ; *s ; s++)
		MSG_WriteString (&client->message, *s);
	MSG_WriteByte (&client->message, 0);

// send music
	MSG_WriteByte (&client->message, svc_cdtrack);
	MSG_WriteByte (&client->message, sv.edicts->v.sounds);
	MSG_WriteByte (&client->message, sv.edicts->v.sounds);

// set view
	MSG_WriteByte (&client->message, svc_setview);
	MSG_WriteShort (&client->message, NUM_FOR_EDICT("SV_SendServerinfo", client->edict));

	MSG_WriteByte (&client->message, svc_signonnum);
	MSG_WriteByte (&client->message, 1);

	client->sendsignon = true;
	client->spawned = false;		// need prespawn, spawn, etc
}

/*
================
SV_ConnectClient

Initializes a client_t for a new net connection.  This will only be called
once for a player each game, not once for each level change.
================
*/
void SV_ConnectClient (int clientnum)
{
	edict_t			*ent;
	client_t		*client;
	int				edictnum;
	struct qsocket_s *netconnection;
	int				i;
	float			spawn_parms[NUM_SPAWN_PARMS];

	client = svs.clients + clientnum;

	Con_DPrintf ("Client %s connected\n", client->netconnection->address);

	edictnum = clientnum+1;

	ent = EDICT_NUM("SV_ConnectClient", edictnum);

// set up the client_t
	netconnection = client->netconnection;

	if (sv.loadgame)
		memcpy (spawn_parms, client->spawn_parms, sizeof(spawn_parms));
	memset (client, 0, sizeof(*client));
	client->netconnection = netconnection;

	strcpy (client->name, "unconnected");
	client->active = true;
	client->spawned = false;
	client->edict = ent;
	client->message.data = client->msgbuf;
	client->message.maxsize = sizeof(client->msgbuf);
	client->message.allowoverflow = true;		// we can catch it
	client->message.function = "SV_ConnectClient";

#ifdef IDGODS
	client->privileged = IsID(&client->netconnection->addr);
#else
	client->privileged = false;
#endif

	if (sv.loadgame)
		memcpy (client->spawn_parms, spawn_parms, sizeof(spawn_parms));
	else
	{
	// call the progs to get default spawn parms for the new client
		PR_ExecuteProgram (pr_global_struct->SetNewParms, "SetNewParms");
		for (i=0 ; i<NUM_SPAWN_PARMS ; i++)
			client->spawn_parms[i] = (&pr_global_struct->parm1)[i];
	}

	SV_SendServerinfo (client);
}


/*
===================
SV_CheckForNewClients

===================
*/
void SV_CheckForNewClients (void)
{
	struct qsocket_s	*ret;
	int				i;

//
// check for new connections
//
	while (1)
	{
		ret = NET_CheckNewConnections ();
		if (!ret)
			break;

	//
	// init a new client structure
	//
		for (i=0 ; i<svs.maxclients ; i++)
			if (!svs.clients[i].active)
				break;
		if (i == svs.maxclients)
			Sys_Error ("Host_CheckForNewClients: no free clients");

		svs.clients[i].netconnection = ret;
		SV_ConnectClient (i);

		net_activeconnections++;
	}
}



/*
===============================================================================

FRAME UPDATES

===============================================================================
*/

/*
==================
SV_ClearDatagram

==================
*/
void SV_ClearDatagram (void)
{
	SZ_Clear (&sv.datagram);
}

/*
=============================================================================

The PVS must include a small area around the client to allow head bobbing
or other small motion on the client side.  Otherwise, a bob might cause an
entity that should be visible to not show up, especially when the bob
crosses a waterline.

=============================================================================
*/

int		fatbytes;
byte	fatpvs[MAX_MAP_LEAFS/8];

void SV_AddToFatPVS (vec3_t org, mnode_t *node, model_t *worldmodel)
{
	int		i;
	byte	*pvs;
	mplane_t	*plane;
	float	d;

	while (1)
	{
	// if this is a leaf, accumulate the pvs bits
		if (node->contents < 0)
		{
			if (node->contents != CONTENTS_SOLID)
			{
				pvs = Mod_LeafPVS ( (mleaf_t *)node, worldmodel);
				for (i=0 ; i<fatbytes ; i++)
					fatpvs[i] |= pvs[i];
			}
			return;
		}

		plane = node->plane;
		d = DotProduct (org, plane->normal) - plane->dist;
		if (d > 8)
			node = node->children[0];
		else if (d < -8)
			node = node->children[1];
		else
		{	// go down both
			SV_AddToFatPVS (org, node->children[0], worldmodel);
			node = node->children[1];
		}
	}
}

/*
=============
SV_FatPVS

Calculates a PVS that is the inclusive or of all leafs within 8 pixels of the
given point.
=============
*/
byte *SV_FatPVS (vec3_t org, model_t *worldmodel)
{
	fatbytes = (worldmodel->numleafs+31)>>3;
	Q_memset (fatpvs, 0, fatbytes);
	SV_AddToFatPVS (org, worldmodel->nodes, worldmodel);
	return fatpvs;
}

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


/*
=============
SV_WriteEntitiesToClient

=============
*/
void SV_WriteEntitiesToClient (edict_t	*clent, sizebuf_t *msg)
{
	int	     e, i, packetsize;
	int	     bits;
	byte	     *pvs;
	vec3_t	     org;
        float	     miss, alpha, fullbright;
	edict_t	     *ent;
	static float lastmsg = 0;

// find the client's PVS
	VectorAdd (clent->v.origin, clent->v.view_ofs, org);
	pvs = SV_FatPVS (org, sv.worldmodel);

// send over all entities (excpet the client) that touch the pvs
	ent = NEXT_EDICT(sv.edicts);
	for (e=1 ; e<sv.num_edicts ; e++, ent = NEXT_EDICT(ent))
	{
#ifdef QUAKE2
		// don't send if flagged for NODRAW and there are no lighting effects
		if (ent->v.effects == EF_NODRAW)
			continue;
#endif

// ignore if not touching a PV leaf
		if (ent != clent)	// clent is ALLWAYS sent
		{
// ignore ents without visible models
			if (!ent->v.modelindex || !(*pr_String("SV_WriteEntitiesToClient", ent->v.model)))
				continue;

			for (i=0 ; i < ent->num_leafs ; i++)
				if (pvs[ent->leafnums[i] >> 3] & (1 << (ent->leafnums[i]&7) ))
					break;

			if (i == ent->num_leafs)
				continue;		// not visible
		}

// send an update
		bits = 0;

		for (i=0 ; i<3 ; i++)
		{
			miss = ent->v.origin[i] - ent->baseline.origin[i];
			if ( miss < -0.1 || miss > 0.1 )
				bits |= U_ORIGIN1<<i;
		}

		if ( ent->v.angles[0] != ent->baseline.angles[0] )
			bits |= U_ANGLE1;

		if ( ent->v.angles[1] != ent->baseline.angles[1] )
			bits |= U_ANGLE2;

		if ( ent->v.angles[2] != ent->baseline.angles[2] )
			bits |= U_ANGLE3;

		if (ent->v.movetype == MOVETYPE_STEP)
			bits |= U_NOLERP;	// don't mess up the step animation

		if (ent->baseline.colormap != ent->v.colormap)
			bits |= U_COLORMAP;

		if (ent->baseline.skin != ent->v.skin)
			bits |= U_SKIN;

		if (ent->baseline.frame != ent->v.frame)
			bits |= U_FRAME;

		if (ent->baseline.effects != ent->v.effects)
			bits |= U_EFFECTS;

		if (ent->baseline.modelindex != ent->v.modelindex)
			bits |= U_MODEL;

                // Nehahra: Model Alpha
                {
                 eval_t  *val;
                 if (val = GetEdictFieldValue(ent, "alpha"))
                  alpha=val->_float;
                 else
                  alpha=1;

                 if (val = GetEdictFieldValue(ent, "fullbright"))
                  fullbright = val->_float;
                 else
                  fullbright = 0;

                 if ((alpha < 1) && (alpha > 0) || fullbright)
                  bits |= U_TRANS;
                }

		if (e >= 256)
			bits |= U_LONGENTITY;

		if (bits >= 256)
			bits |= U_MOREBITS;

		packetsize = 16 + 2; // Original + missing for worst case

                if (bits & U_TRANS)
			packetsize += 12; // Nehahra

		if (sv.Protocol != PROTOCOL_VERSION)
			++packetsize; // PROTOCOL_VERSION_BJP-3

		if (sv_max_datagram == MAX_DATAGRAM)
			packetsize += 256; // Empirical margin to avoid Loop_SendMessage or other overflows

		if (msg->maxsize - msg->cursize < packetsize)
		{
			if (IsTimeout (&lastmsg, 2))
				Con_Printf ("packet overflow\n");

			return;
		}

	//
	// write the message
	//
		MSG_WriteByte (msg,bits | U_SIGNAL);

		if (bits & U_MOREBITS)
			MSG_WriteByte (msg, bits>>8);
		if (bits & U_LONGENTITY)
			MSG_WriteShort (msg,e);
		else
			MSG_WriteByte (msg,e);

		if (bits & U_MODEL)
			SV_WriteByteShort (msg,	ent->v.modelindex);
		if (bits & U_FRAME)
			MSG_WriteByte (msg, ent->v.frame);
		if (bits & U_COLORMAP)
			MSG_WriteByte (msg, ent->v.colormap);
		if (bits & U_SKIN)
			MSG_WriteByte (msg, ent->v.skin);
		if (bits & U_EFFECTS)
			MSG_WriteByte (msg, ent->v.effects);
		if (bits & U_ORIGIN1)
			MSG_WriteCoord (msg, ent->v.origin[0]);
		if (bits & U_ANGLE1)
			MSG_WriteAngle(msg, ent->v.angles[0]);
		if (bits & U_ORIGIN2)
			MSG_WriteCoord (msg, ent->v.origin[1]);
		if (bits & U_ANGLE2)
			MSG_WriteAngle(msg, ent->v.angles[1]);
		if (bits & U_ORIGIN3)
			MSG_WriteCoord (msg, ent->v.origin[2]);
		if (bits & U_ANGLE3)
			MSG_WriteAngle(msg, ent->v.angles[2]);
                if (bits & U_TRANS) { // Nehahra
                        MSG_WriteFloat(msg, 2);
                        MSG_WriteFloat(msg, alpha);
                        MSG_WriteFloat(msg, fullbright);
                }
	}
}

/*
=============
SV_CleanupEnts

=============
*/
void SV_CleanupEnts (void)
{
	int		e;
	edict_t	*ent;

	ent = NEXT_EDICT(sv.edicts);
	for (e=1 ; e<sv.num_edicts ; e++, ent = NEXT_EDICT(ent))
	{
		ent->v.effects = (int)ent->v.effects & ~EF_MUZZLEFLASH;
	}

}

/*
==================
SV_WriteClientdataToMessage

==================
*/
void SV_WriteClientdataToMessage (edict_t *ent, sizebuf_t *msg)
{
	int		bits;
	int		i;
	edict_t	*other;
	int		items;
#ifndef QUAKE2
	eval_t	*val;
#endif

//
// send a damage message
//
	if (ent->v.dmg_take || ent->v.dmg_save)
	{
		other = PROG_TO_EDICT("SV_WriteClientdataToMessage", ent->v.dmg_inflictor);
		MSG_WriteByte (msg, svc_damage);
		MSG_WriteByte (msg, ent->v.dmg_save);
		MSG_WriteByte (msg, ent->v.dmg_take);
		for (i=0 ; i<3 ; i++)
			MSG_WriteCoord (msg, other->v.origin[i] + 0.5*(other->v.mins[i] + other->v.maxs[i]));

		ent->v.dmg_take = 0;
		ent->v.dmg_save = 0;
	}

//
// send the current viewpos offset from the view entity
//
	SV_SetIdealPitch ();		// how much to look up / down ideally

// a fixangle might get lost in a dropped packet.  Oh well.
	if ( ent->v.fixangle )
	{
		MSG_WriteByte (msg, svc_setangle);
		for (i=0 ; i < 3 ; i++)
			MSG_WriteAngle (msg, ent->v.angles[i] );
		ent->v.fixangle = 0;
	}

	bits = 0;

	if (ent->v.view_ofs[2] != DEFAULT_VIEWHEIGHT)
		bits |= SU_VIEWHEIGHT;

	if (ent->v.idealpitch)
		bits |= SU_IDEALPITCH;

// stuff the sigil bits into the high bits of items for sbar, or else
// mix in items2
#ifdef QUAKE2
	items = (int)ent->v.items | ((int)ent->v.items2 << 23);
#else
	val = GetEdictFieldValue(ent, "items2");

	if (val)
		items = (int)ent->v.items | ((int)val->_float << 23);
	else
		items = (int)ent->v.items | ((int)pr_global_struct->serverflags << 28);
#endif

	bits |= SU_ITEMS;

	if ( (int)ent->v.flags & FL_ONGROUND)
		bits |= SU_ONGROUND;

	if ( ent->v.waterlevel >= 2)
		bits |= SU_INWATER;

	for (i=0 ; i<3 ; i++)
	{
		if (ent->v.punchangle[i])
			bits |= (SU_PUNCH1<<i);
		if (ent->v.velocity[i])
			bits |= (SU_VELOCITY1<<i);
	}

	if (ent->v.weaponframe)
		bits |= SU_WEAPONFRAME;

	if (ent->v.armorvalue)
		bits |= SU_ARMOR;

//	if (ent->v.weapon)
		bits |= SU_WEAPON;

// send the data

	MSG_WriteByte (msg, svc_clientdata);
	MSG_WriteShort (msg, bits);

	if (bits & SU_VIEWHEIGHT)
		MSG_WriteChar (msg, ent->v.view_ofs[2]);

	if (bits & SU_IDEALPITCH)
		MSG_WriteChar (msg, ent->v.idealpitch);

	for (i=0 ; i<3 ; i++)
	{
		if (bits & (SU_PUNCH1<<i))
			MSG_WriteChar (msg, ent->v.punchangle[i]);
		if (bits & (SU_VELOCITY1<<i))
			MSG_WriteChar (msg, ent->v.velocity[i]/16);
	}

// [always sent]	if (bits & SU_ITEMS)
	MSG_WriteLong (msg, items);

	if (bits & SU_WEAPONFRAME)
		MSG_WriteByte (msg, ent->v.weaponframe);
	if (bits & SU_ARMOR)
		MSG_WriteByte (msg, ent->v.armorvalue);
	if (bits & SU_WEAPON)
		SV_WriteByteShort (msg, SV_ModelIndex(pr_String("SV_WriteClientdataToMessage", ent->v.weaponmodel)));

	MSG_WriteShort (msg, ent->v.health);
	MSG_WriteByte (msg, ent->v.currentammo);
	MSG_WriteByte (msg, ent->v.ammo_shells);
	MSG_WriteByte (msg, ent->v.ammo_nails);
	MSG_WriteByte (msg, ent->v.ammo_rockets);
	MSG_WriteByte (msg, ent->v.ammo_cells);

	if (standard_quake)
	{
		MSG_WriteByte (msg, ent->v.weapon);
	}
	else
	{
		for(i=0;i<32;i++)
		{
			if ( ((int)ent->v.weapon) & (1<<i) )
			{
				MSG_WriteByte (msg, i);
				break;
			}
		}
	}
}

/*
=======================
SV_SendClientDatagram
=======================
*/
qboolean SV_SendClientDatagram (client_t *client)
{
	byte		buf[MAX_DATAGRAM];
	sizebuf_t	msg;

	msg.data = buf;
	msg.maxsize = MAX_DATAGRAM2;
	msg.cursize = 0;
	msg.function = "SV_SendClientDatagram";

	MSG_WriteByte (&msg, svc_time);
	MSG_WriteFloat (&msg, sv.time);

// add the client specific data to the datagram
	SV_WriteClientdataToMessage (client->edict, &msg);

	SV_WriteEntitiesToClient (client->edict, &msg);

// copy the server datagram if there is space
	if (msg.cursize + sv.datagram.cursize < msg.maxsize)
		SZ_Write (&msg, sv.datagram.data, sv.datagram.cursize);

// send the datagram
	if (NET_SendUnreliableMessage (client->netconnection, &msg) == -1)
	{
		SV_DropClient (true);// if the message couldn't send, kick off
		return false;
	}

	return true;
}

/*
=======================
SV_UpdateToReliableMessages
=======================
*/
void SV_UpdateToReliableMessages (void)
{
	int			i, j;
	client_t *client;

// check for changes to be sent over the reliable streams
	for (i=0, host_client = svs.clients ; i<svs.maxclients ; i++, host_client++)
	{
		if (host_client->old_frags != host_client->edict->v.frags)
		{
			for (j=0, client = svs.clients ; j<svs.maxclients ; j++, client++)
			{
				if (!client->active)
					continue;
				MSG_WriteByte (&client->message, svc_updatefrags);
				MSG_WriteByte (&client->message, i);
				MSG_WriteShort (&client->message, host_client->edict->v.frags);
			}

			host_client->old_frags = host_client->edict->v.frags;
		}
	}

	for (j=0, client = svs.clients ; j<svs.maxclients ; j++, client++)
	{
		if (!client->active)
			continue;
		SZ_Write (&client->message, sv.reliable_datagram.data, sv.reliable_datagram.cursize);
	}

	SZ_Clear (&sv.reliable_datagram);
}


/*
=======================
SV_SendNop

Send a nop message without trashing or sending the accumulated client
message buffer
=======================
*/
void SV_SendNop (client_t *client)
{
	sizebuf_t	msg;
	byte		buf[4];

	msg.data = buf;
	msg.maxsize = sizeof(buf);
	msg.cursize = 0;
	msg.function = "SV_SendNop";

	MSG_WriteChar (&msg, svc_nop);

	if (NET_SendUnreliableMessage (client->netconnection, &msg) == -1)
		SV_DropClient (true);	// if the message couldn't send, kick off
	client->last_message = realtime;
}

/*
=======================
SV_SendClientMessages
=======================
*/
void SV_SendClientMessages (void)
{
	int			i;

// update frags, names, etc
	SV_UpdateToReliableMessages ();

// build individual updates
	for (i=0, host_client = svs.clients ; i<svs.maxclients ; i++, host_client++)
	{
		if (!host_client->active)
			continue;

		if (host_client->spawned)
		{
			if (!SV_SendClientDatagram (host_client))
				continue;
		}
		else
		{
		// the player isn't totally in the game yet
		// send small keepalive messages if too much time has passed
		// send a full message when the next signon stage has been requested
		// some other message data (name changes, etc) may accumulate
		// between signon stages
			if (!host_client->sendsignon)
			{
				if (realtime - host_client->last_message > 5)
					SV_SendNop (host_client);
				continue;	// don't send out non-signon messages
			}
		}

		// check for an overflowed message.  Should only happen
		// on a very fucked up connection that backs up a lot, then
		// changes level
		if (host_client->message.overflowed)
		{
			SV_DropClient (true);
			host_client->message.overflowed = false;
			continue;
		}

		if (host_client->message.cursize || host_client->dropasap)
		{
			if (!NET_CanSendMessage (host_client->netconnection))
			{
//				I_Printf ("can't write\n");
				continue;
			}

			if (host_client->dropasap)
				SV_DropClient (false);	// went to another level
			else
			{
				if (NET_SendMessage (host_client->netconnection
				, &host_client->message) == -1)
					SV_DropClient (true);	// if the message couldn't send, kick off
				SZ_Clear (&host_client->message);
				host_client->last_message = realtime;
				host_client->sendsignon = false;
			}
		}
	}


// clear muzzle flashes
	SV_CleanupEnts ();
}


/*
==============================================================================

SERVER SPAWNING

==============================================================================
*/

/*
================
SV_ModelIndex

================
*/
int SV_ModelIndex (char *name)
{
	int		i;

	if (!name || !name[0])
		return 0;

	for (i=0 ; i<MAX_MODELS && sv.model_precache[i] ; i++)
		if (!strcmp(sv.model_precache[i], name))
			return i;
	if (i==MAX_MODELS || !sv.model_precache[i])
		Sys_Error ("SV_ModelIndex: model %s not precached", name);
	return i;
}

/*
================
SV_CreateBaseline

================
*/
void SV_CreateBaseline (void)
{
	int	i;
	edict_t	*svent;
	int	entnum;

	for (entnum = 0; entnum < sv.num_edicts ; entnum++)
	{
	// get the current server version
		if (pr_free[entnum])
			continue;
		svent = EDICT_NUM("SV_CreateBaseline", entnum);
		if (entnum > svs.maxclients && !svent->v.modelindex)
			continue;

	//
	// create entity baseline
	//
		VectorCopy (svent->v.origin, svent->baseline.origin);
		VectorCopy (svent->v.angles, svent->baseline.angles);
		svent->baseline.frame = svent->v.frame;
		svent->baseline.skin = svent->v.skin;
		if (entnum > 0 && entnum <= svs.maxclients)
		{
			svent->baseline.colormap = entnum;
			svent->baseline.modelindex = SV_ModelIndex("progs/player.mdl");
		}
		else
		{
			svent->baseline.colormap = 0;
			svent->baseline.modelindex =
				SV_ModelIndex(pr_String("SV_CreateBaseline", svent->v.model));
		}

	//
	// add to the message
	//
		MSG_WriteByte (&sv.signon,svc_spawnbaseline);
		MSG_WriteShort (&sv.signon,entnum);

		SV_WriteByteShort (&sv.signon, svent->baseline.modelindex);
		MSG_WriteByte (&sv.signon, svent->baseline.frame);
		MSG_WriteByte (&sv.signon, svent->baseline.colormap);
		MSG_WriteByte (&sv.signon, svent->baseline.skin);
		for (i=0 ; i<3 ; i++)
		{
			MSG_WriteCoord(&sv.signon, svent->baseline.origin[i]);
			MSG_WriteAngle(&sv.signon, svent->baseline.angles[i]);
		}
	}

	// Check normal signon size (8192) and normal MAX_MSGLEN-2 (8000-2),
	// the latter limit being lower and occurring in Host_PreSpawn_f
	if (sv.signon.cursize - sv.signondiff > 8000 - 2)
	{
		Con_DPrintf ("\x02SV_CreateBaseline: ");
		Con_DPrintf ("excessive signon buffer size (%d, normal max = %d)\n", sv.signon.cursize - sv.signondiff, 8000 - 2);
	}
}


/*
================
SV_SendReconnect

Tell all the clients that the server is changing levels
================
*/
void SV_SendReconnect (void)
{
	char	  data[128];
	sizebuf_t msg;

	msg.data = data;
	msg.cursize = 0;
	msg.maxsize = sizeof(data);
	msg.function = "SV_SendReconnect";

	MSG_WriteChar (&msg, svc_stufftext);
	MSG_WriteString (&msg, "reconnect\n");
	
	// Don't send a reconnect message to a local client; it can cause problems if coming
	// after the client has already reached signon 4. In that case, the client will behave
	// as if reconnect is entered in the console while playing; the loading plaque will
	// display and the client is detached from the game (which will continue)
	NET_SendToAll2 (&msg, 5, true);
	
	if (cls.state != ca_dedicated)
#ifdef QUAKE2
		Cbuf_InsertText ("reconnect\n");
#else
		Cmd_ExecuteString ("reconnect\n", src_command);
#endif
}


/*
================
SV_SaveSpawnparms

Grabs the current state of each client for saving across the
transition to another level
================
*/
void SV_SaveSpawnparms (void)
{
	int		i, j;

	svs.serverflags = pr_global_struct->serverflags;

	for (i=0, host_client = svs.clients ; i<svs.maxclients ; i++, host_client++)
	{
		if (!host_client->active)
			continue;

	// call the progs to get default spawn parms for the new client
		pr_global_struct->self = EDICT_TO_PROG(host_client->edict);
		PR_ExecuteProgram (pr_global_struct->SetChangeParms, "SetChangeParms");
		for (j=0 ; j<NUM_SPAWN_PARMS ; j++)
			host_client->spawn_parms[j] = (&pr_global_struct->parm1)[j];
	}
}


/*
================
SV_SpawnServer

This is called at the start of each level
================
*/
extern float		scr_centertime_off;

#ifdef QUAKE2
void SV_SpawnServer (char *server, char *startspot)
#else
void SV_SpawnServer (char *server)
#endif
{
	edict_t		*ent;
	int			i;

	// let's not have any servers with no name
	if (hostname.string[0] == 0)
		Cvar_Set ("hostname", "UNNAMED");
	scr_centertime_off = 0;

	Con_DPrintf ("SpawnServer: %s\n",server);
	svs.changelevel_issued = false;		// now safe to issue another

//
// tell all connected clients that we are going to a new level
//
	if (sv.active)
	{
		SV_SendReconnect ();
	}

//
// make cvars consistant
//
	if (coop.value)
		Cvar_SetValue ("deathmatch", 0);
	current_skill = (int)(skill.value + 0.5);
	if (current_skill < 0)
		current_skill = 0;
	if (current_skill > 3)
		current_skill = 3;

	Cvar_SetValue ("skill", (float)current_skill);

//
// set up the new server
//
	Host_ClearMemory ();

	memset (&sv, 0, sizeof(sv));

	strcpy (sv.name, server);
#ifdef QUAKE2
	if (startspot)
		strcpy(sv.startspot, startspot);
#endif

	sv.Protocol = sv_protocol;
	sv_max_datagram = sv_protocol == PROTOCOL_VERSION ? 1024 : MAX_DATAGRAM; // Limit packet size if old protocol

// load progs to get entity field count
	PR_LoadProgs ();

// allocate server memory
	sv.max_edicts = MAX_EDICTS;

	sv.edicts = Hunk_AllocName (sv.max_edicts*pr_edict_size, "edicts");

	sv.datagram.maxsize = MAX_DATAGRAM2;
	sv.datagram.cursize = 0;
	sv.datagram.data = sv.datagram_buf;
	sv.datagram.function = "SV_SpawnServer dgram";

	sv.reliable_datagram.maxsize = MAX_DATAGRAM2;
	sv.reliable_datagram.cursize = 0;
	sv.reliable_datagram.data = sv.reliable_datagram_buf;
	sv.reliable_datagram.function = "SV_SpawnServer rel";

	sv.signon.maxsize = sizeof(sv.signon_buf);
	sv.signon.cursize = sv.signondiff = 0;
	sv.signon.data = sv.signon_buf;
	sv.signon.function = "SV_SpawnServer signon";

// leave slots at start for clients only
	sv.num_edicts = sv.active_edicts = svs.maxclients+1;

	for (i=0 ; i<svs.maxclients ; i++)
	{
		ent = EDICT_NUM("SV_SpawnServer1", i+1);
		svs.clients[i].edict = ent;
	}

	sv.state = ss_loading;
	sv.paused = false;

	sv.time = 1.0;

	strcpy (sv.name, server);
	sprintf (sv.modelname,"maps/%s.bsp", server);
	Mod_IsWorldModel = true;
	sv.worldmodel = Mod_ForName (sv.modelname, false);
	Mod_IsWorldModel = false; // Make sure to reset this
	if (!sv.worldmodel)
	{
		Con_Printf ("Couldn't spawn server %s\n", sv.modelname);
		sv.active = false;
		return;
	}
	sv.models[1] = sv.worldmodel;

//
// clear world interaction links
//
	SV_ClearWorld ();

	sv.sound_precache[0] = pr_strings;

	sv.model_precache[0] = pr_strings;
	sv.model_precache[1] = sv.modelname;
	for (i=1 ; i<sv.worldmodel->numsubmodels ; i++)
	{
		sv.model_precache[1+i] = localmodels[i];
		sv.models[i+1] = Mod_ForName (localmodels[i], false);
	}

//
// load the rest of the entities
//
	ent = EDICT_NUM("SV_SpawnServer2", 0);
	memset (&ent->v, 0, progs->entityfields * 4);
	pr_free[0] = false;
	ent->v.model = sv.worldmodel->name - pr_strings;
	ent->v.modelindex = 1;		// world model
	ent->v.solid = SOLID_BSP;
	ent->v.movetype = MOVETYPE_PUSH;

	if (coop.value)
		pr_global_struct->coop = coop.value;
	else
		pr_global_struct->deathmatch = deathmatch.value;

	pr_global_struct->mapname = sv.name - pr_strings;
#ifdef QUAKE2
	pr_global_struct->startspot = sv.startspot - pr_strings;
#endif

// serverflags are for cross level information (sigils)
	pr_global_struct->serverflags = svs.serverflags;

	ED_LoadFromFile (sv.worldmodel->entities);

	sv.active = true;

// all setup is completed, any further precache statements are errors
	sv.state = ss_active;

// run two frames to allow everything to settle
	host_frametime = 0.1;
	SV_Physics ();
	SV_Physics ();

// create a baseline for more efficient communications
	SV_CreateBaseline ();

// send serverinfo to all connected clients
	for (i=0,host_client = svs.clients ; i<svs.maxclients ; i++, host_client++)
		if (host_client->active)
			SV_SendServerinfo (host_client);

	Con_DPrintf ("Server spawned.\n");
}

