/*
	pr->pr_cmds.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
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif

#include "QF/cbuf.h"
#include "QF/clip_hull.h"
#include "QF/cmd.h"
#include "QF/console.h"
#include "QF/cvar.h"
#include "QF/msg.h"
#include "QF/sys.h"
#include "QF/va.h"

#include "compat.h"
#include "host.h"
#include "server.h"
#include "sv_progs.h"
#include "world.h"


// BUILT-IN FUNCTIONS =========================================================

/*
	PF_error

	This is a TERMINAL error, which will kill off the entire server.
	Dumps self.

	error(value)
*/
void
PF_error (progs_t *pr)
{
	const char *s;
	edict_t    *ed;

	s = PF_VarString (pr, 0);
	Con_Printf ("======SERVER ERROR in %s:\n%s\n",
				PR_GetString (&sv_pr_state, pr->pr_xfunction->s_name), s);
	ed = PROG_TO_EDICT (pr, *sv_globals.self);
	ED_Print (pr, ed);

	Host_Error ("Program error");
}

/*
	PF_objerror

	Dumps out self, then an error message.  The program is aborted and self is
	removed, but the level can continue.

	objerror(value)
*/
void
PF_objerror (progs_t *pr)
{
	const char *s;
	edict_t    *ed;

	s = PF_VarString (pr, 0);
	Con_Printf ("======OBJECT ERROR in %s:\n%s\n",
				PR_GetString (&sv_pr_state, pr->pr_xfunction->s_name), s);
	ed = PROG_TO_EDICT (pr, *sv_globals.self);
	ED_Print (pr, ed);
	ED_Free (pr, ed);

	Host_Error ("Program error");
}

/*
	PF_makevectors

	Writes new values for v_forward, v_up, and v_right based on angles
	makevectors(vector)
*/
void
PF_makevectors (progs_t *pr)
{
	AngleVectors (P_VECTOR (pr, 0), *sv_globals.v_forward,
				  *sv_globals.v_right, *sv_globals.v_up);
}

/*
	PF_setorigin

	This is the only valid way to move an object without using the physics of
	the world (setting velocity and waiting).  Directly changing origin will
	not set internal links correctly, so clipping would be messed up.  This
	should be called when an object is spawned, and then only if it is
	teleported.

	setorigin (entity, origin)
*/
void
PF_setorigin (progs_t *pr)
{
	edict_t    *e;
	float      *org;

	e = P_EDICT (pr, 0);
	org = P_VECTOR (pr, 1);
	VectorCopy (org, SVvector (e, origin));
	SV_LinkEdict (e, false);
}

void
SetMinMaxSize (progs_t *pr, edict_t *e, const vec3_t min, const vec3_t max,
			   qboolean rotate)
{
	float       a;
	float       bounds[2][3];
	float       xvector[2], yvector[2];
	float      *angles;
	int         i, j, k, l;
	vec3_t      rmin, rmax, base, transformed;

	for (i = 0; i < 3; i++)
		if (min[i] > max[i])
			PR_RunError (pr, "backwards mins/maxs");

	rotate = false;					// FIXME: implement rotation properly again

	if (!rotate) {
		VectorCopy (min, rmin);
		VectorCopy (max, rmax);
	} else {
		// find min / max for rotations
		angles = SVvector (e, angles);

		a = angles[1] / 180 * M_PI;

		xvector[0] = cos (a);
		xvector[1] = sin (a);
		yvector[0] = -sin (a);
		yvector[1] = cos (a);

		VectorCopy (min, bounds[0]);
		VectorCopy (max, bounds[1]);

		rmin[0] = rmin[1] = rmin[2] = 9999;
		rmax[0] = rmax[1] = rmax[2] = -9999;

		for (i = 0; i <= 1; i++) {
			base[0] = bounds[i][0];
			for (j = 0; j <= 1; j++) {
				base[1] = bounds[j][1];
				for (k = 0; k <= 1; k++) {
					base[2] = bounds[k][2];

					// transform the point
					transformed[0] =
						xvector[0] * base[0] + yvector[0] * base[1];
					transformed[1] =
						xvector[1] * base[0] + yvector[1] * base[1];
					transformed[2] = base[2];

					for (l = 0; l < 3; l++) {
						if (transformed[l] < rmin[l])
							rmin[l] = transformed[l];
						if (transformed[l] > rmax[l])
							rmax[l] = transformed[l];
					}
				}
			}
		}
	}

// set derived values
	VectorCopy (rmin, SVvector (e, mins));
	VectorCopy (rmax, SVvector (e, maxs));
	VectorSubtract (max, min, SVvector (e, size));

	SV_LinkEdict (e, false);
}

/*
	PF_setsize

	the size box is rotated by the current angle

	setsize (entity, minvector, maxvector)
*/
void
PF_setsize (progs_t *pr)
{
	edict_t    *e;
	float      *min, *max;

	e = P_EDICT (pr, 0);
	min = P_VECTOR (pr, 1);
	max = P_VECTOR (pr, 2);
	SetMinMaxSize (pr, e, min, max, false);
}

/*
	PF_setmodel

	setmodel(entity, model)
*/
void
PF_setmodel (progs_t *pr)
{
	edict_t    *e;
	const char *m, **check;
	model_t    *mod;
	int         i;

	e = P_EDICT (pr, 0);
	m = P_STRING (pr, 1);

// check to see if model was properly precached
	for (i = 0, check = sv.model_precache; *check; i++, check++)
		if (!strcmp (*check, m))
			break;

	if (!*check)
		PR_RunError (pr, "no precache: %s\n", m);


	SVstring (e, model) = PR_SetString (pr, m);
	SVfloat (e, modelindex) = i;				// SV_ModelIndex (m);

	mod = sv.models[(int) SVfloat (e, modelindex)];	// Mod_ForName (m, true);

	if (mod)
		SetMinMaxSize (pr, e, mod->mins, mod->maxs, true);
	else
		SetMinMaxSize (pr, e, vec3_origin, vec3_origin, true);
}

/*
	PF_bprint

	broadcast print to everyone on server

	bprint(value)
*/
void
PF_bprint (progs_t *pr)
{
	const char *s;

	s = PF_VarString (pr, 0);
	SV_BroadcastPrintf ("%s", s);
}

/*
	PF_sprint

	single print to a specific client

	sprint(clientent, value)
*/
void
PF_sprint (progs_t *pr)
{
	const char *s;
	client_t   *client;
	int         entnum;

	entnum = P_EDICTNUM (pr, 0);
	s = PF_VarString (pr, 1);

	if (entnum < 1 || entnum > svs.maxclients) {
		Con_Printf ("tried to sprint to a non-client\n");
		return;
	}

	client = &svs.clients[entnum - 1];

	MSG_WriteByte (&client->message, svc_print);
	MSG_WriteString (&client->message, s);
}

/*
	PF_centerprint

	single print to a specific client

	centerprint(clientent, value)
*/
void
PF_centerprint (progs_t *pr)
{
	const char       *s;
	client_t   *client;
	int         entnum;

	entnum = P_EDICTNUM (pr, 0);
	s = PF_VarString (pr, 1);

	if (entnum < 1 || entnum > svs.maxclients) {
		Con_Printf ("tried to sprint to a non-client\n");
		return;
	}

	client = &svs.clients[entnum - 1];

	MSG_WriteByte (&client->message, svc_centerprint);
	MSG_WriteString (&client->message, s);
}

/*
	PF_particle

	particle(origin, color, count)
*/
void
PF_particle (progs_t *pr)
{
	float      *org, *dir;
	float       color;
	float       count;

	org = P_VECTOR (pr, 0);
	dir = P_VECTOR (pr, 1);
	color = P_FLOAT (pr, 2);
	count = P_FLOAT (pr, 3);
	SV_StartParticle (org, dir, color, count);
}

void
PF_ambientsound (progs_t *pr)
{
	const char **check;
	const char  *samp;
	float		*pos;
	float		 vol, attenuation;
	int			 soundnum;

	pos = P_VECTOR (pr, 0);
	samp = P_STRING (pr, 1);
	vol = P_FLOAT (pr, 2);
	attenuation = P_FLOAT (pr, 3);

	// check to see if samp was properly precached
	for (soundnum = 0, check = sv.sound_precache; *check; check++, soundnum++)
		if (!strcmp (*check, samp))
			break;

	if (!*check) {
		Con_Printf ("no precache: %s\n", samp);
		return;
	}

	// add an svc_spawnambient command to the level signon packet
	MSG_WriteByte (&sv.signon, svc_spawnstaticsound);
	MSG_WriteCoordV (&sv.signon, pos);
	MSG_WriteByte (&sv.signon, soundnum);
	MSG_WriteByte (&sv.signon, vol * 255);
	MSG_WriteByte (&sv.signon, attenuation * 64);

}

/*
	PF_sound

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

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

	An attenuation of 0 will play full volume everywhere in the level.
	Larger attenuations will drop off.
*/
void
PF_sound (progs_t *pr)
{
	const char *sample;
	float		attenuation;
	int			channel, volume;
	edict_t    *entity;

	entity = P_EDICT (pr, 0);
	channel = P_FLOAT (pr, 1);
	sample = P_STRING (pr, 2);
	volume = P_FLOAT (pr, 3) * 255;
	attenuation = P_FLOAT (pr, 4);

	if (volume < 0 || volume > 255)
		Sys_Error ("SV_StartSound: volume = %i", volume);
	if (attenuation < 0 || attenuation > 4)
		Sys_Error ("SV_StartSound: attenuation = %f", attenuation);
	if (channel < 0 || channel > 7)
		Sys_Error ("SV_StartSound: channel = %i", channel);

	SV_StartSound (entity, channel, sample, volume, attenuation);
}


/*
	PF_traceline

	Used for use tracing and shot targeting.
	Traces are blocked by bbox and exact bsp entityes, and also slide box
	entities if the tryents flag is set.

	traceline (vector1, vector2, tryents)
*/
void
PF_traceline (progs_t *pr)
{
	float      *v1, *v2;
	int         nomonsters;
	edict_t    *ent;
	trace_t     trace;

	v1 = P_VECTOR (pr, 0);
	v2 = P_VECTOR (pr, 1);
	nomonsters = P_FLOAT (pr, 2);
	ent = P_EDICT (pr, 3);

	trace = SV_Move (v1, vec3_origin, vec3_origin, v2, nomonsters, ent);

	*sv_globals.trace_allsolid = trace.allsolid;
	*sv_globals.trace_startsolid = trace.startsolid;
	*sv_globals.trace_fraction = trace.fraction;
	*sv_globals.trace_inwater = trace.inwater;
	*sv_globals.trace_inopen = trace.inopen;
	VectorCopy (trace.endpos, *sv_globals.trace_endpos);
	VectorCopy (trace.plane.normal, *sv_globals.trace_plane_normal);
	*sv_globals.trace_plane_dist = trace.plane.dist;

	if (trace.ent)
		*sv_globals.trace_ent = EDICT_TO_PROG (pr, trace.ent);
	else
		*sv_globals.trace_ent = EDICT_TO_PROG (pr, sv.edicts);
}

/*
	PF_checkpos

	Returns true if the given entity can move to the given position from it's
	current position by walking or rolling.
	FIXME: make work...
	scalar checkpos (entity, vector)
*/
void
PF_checkpos (progs_t *pr)
{
}

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

byte        checkpvs[MAX_MAP_LEAFS / 8];

int
PF_newcheckclient (progs_t *pr, int check)
{
	int         i;
	byte       *pvs;
	edict_t    *ent;
	mleaf_t    *leaf;
	vec3_t      org;

// cycle to the next one

	if (check < 1)
		check = 1;
	if (check > svs.maxclients)
		check = svs.maxclients;

	if (check == svs.maxclients)
		i = 1;
	else
		i = check + 1;

	for (;; i++) {
		if (i == svs.maxclients + 1)
			i = 1;

		ent = EDICT_NUM (pr, i);

		if (i == check)
			break;						// didn't find anything else
		if (ent->free)
			continue;
		if (SVfloat (ent, health) <= 0)
			continue;
		if ((int) SVfloat (ent, flags) & FL_NOTARGET)
			continue;
		// anything that is a client, or has a client as an enemy
		break;
	}

// get the PVS for the entity
	VectorAdd (SVvector (ent, origin), SVvector (ent, view_ofs), org);
	leaf = Mod_PointInLeaf (org, sv.worldmodel);
	pvs = Mod_LeafPVS (leaf, sv.worldmodel);
	memcpy (checkpvs, pvs, (sv.worldmodel->numleafs + 7) >> 3);

	return i;
}

#define	MAX_CHECK	16
int     c_invis, c_notvis;

/*
	PF_checkclient

	Returns a client (or object that has a client enemy) that would be a
	valid target.

	If there are more than one valid options, they are cycled each frame

	If (self.origin + self.viewofs) is not in the PVS of the current target,
	it is not returned at all.

	name checkclient ()
*/
void
PF_checkclient (progs_t *pr)
{
	edict_t    *ent, *self;
	int         l;
	mleaf_t    *leaf;
	vec3_t      view;

// find a new check if on a new frame
	if (sv.time - sv.lastchecktime >= 0.1) {
		sv.lastcheck = PF_newcheckclient (pr, sv.lastcheck);
		sv.lastchecktime = sv.time;
	}
// return check if it might be visible  
	ent = EDICT_NUM (pr, sv.lastcheck);
	if (ent->free || SVfloat (ent, health) <= 0) {
		RETURN_EDICT (pr, sv.edicts);
		return;
	}
// if current entity can't possibly see the check entity, return 0
	self = PROG_TO_EDICT (pr, *sv_globals.self);
	VectorAdd (SVvector (self, origin), SVvector (self, view_ofs), view);
	leaf = Mod_PointInLeaf (view, sv.worldmodel);
	l = (leaf - sv.worldmodel->leafs) - 1;
	if ((l < 0) || !(checkpvs[l >> 3] & (1 << (l & 7)))) {
		c_notvis++;
		RETURN_EDICT (pr, sv.edicts);
		return;
	}
// might be able to see it
	c_invis++;
	RETURN_EDICT (pr, ent);
}

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

/*
	PF_stuffcmd

	Sends text over to the client's execution buffer

	stuffcmd (clientent, value)
*/
void
PF_stuffcmd (progs_t *pr)
{
	const char *str;
	client_t   *old;
	int         entnum;

	entnum = P_EDICTNUM (pr, 0);
	if (entnum < 1 || entnum > svs.maxclients)
		PR_RunError (pr, "Parm 0 not a client");
	str = P_STRING (pr, 1);

	old = host_client;
	host_client = &svs.clients[entnum - 1];
	Host_ClientCommands ("%s", str);
	host_client = old;
}

/*
	PF_localcmd

	Sends text over to the client's execution buffer

	localcmd (string)
*/
void
PF_localcmd (progs_t *pr)
{
	const char       *str;

	str = P_STRING (pr, 0);
	Cbuf_AddText (host_cbuf, str);
}

/*
	PF_findradius

	Returns a chain of entities that have origins within a spherical area

	findradius (origin, radius)
*/
void
PF_findradius (progs_t *pr)
{
	edict_t    *ent, *chain;
	float       rad;
	float      *org;
	int         i, j;
	vec3_t      eorg;

	chain = (edict_t *) sv.edicts;

	org = P_VECTOR (pr, 0);
	rad = P_FLOAT (pr, 1);

	ent = NEXT_EDICT (pr, sv.edicts);
	for (i = 1; i < sv.num_edicts; i++, ent = NEXT_EDICT (pr, ent)) {
		if (ent->free)
			continue;
		if (SVfloat (ent, solid) == SOLID_NOT)
			continue;
		for (j = 0; j < 3; j++)
			eorg[j] = org[j] - (SVvector (ent, origin)[j]
							    + (SVvector (ent, mins)[j]
								   + SVvector (ent, maxs)[j]) * 0.5);
		if (VectorLength (eorg) > rad)
			continue;

		SVentity (ent, chain) = EDICT_TO_PROG (pr, chain);
		chain = ent;
	}

	RETURN_EDICT (pr, chain);
}

void
PF_Spawn (progs_t *pr)
{
	edict_t    *ed;

	ed = ED_Alloc (pr);
	RETURN_EDICT (pr, ed);
}

void
PF_Remove (progs_t *pr)
{
	edict_t    *ed;

	ed = P_EDICT (pr, 0);
	ED_Free (pr, ed);
}

void
PR_CheckEmptyString (progs_t *pr, const char *s)
{
	if (s[0] <= ' ')
		PR_RunError (pr, "Bad string");
}

void
PF_precache_file (progs_t *pr)
{
	// precache_file is only used to copy files with qcc, it does nothing
	R_INT (pr) = P_INT (pr, 0);
}

void
PF_precache_sound (progs_t *pr)
{
	const char *s;
	int         i;

	if (sv.state != ss_loading)
		PR_RunError (pr, "PF_Precache_*: Precache can only be done in spawn "
					 "functions");

	s = P_STRING (pr, 0);
	R_INT (pr) = P_INT (pr, 0);
	PR_CheckEmptyString (pr, s);

	for (i = 0; i < MAX_SOUNDS; i++) {
		if (!sv.sound_precache[i]) {
			sv.sound_precache[i] = s;
			return;
		}
		if (!strcmp (sv.sound_precache[i], s))
			return;
	}
	PR_RunError (pr, "PF_precache_sound: overflow");
}

void
PF_precache_model (progs_t *pr)
{
	const char *s;
	int         i;

	if (sv.state != ss_loading)
		PR_RunError (pr, "PF_Precache_*: Precache can only be done in spawn "
					 "functions");

	s = P_STRING (pr, 0);
	R_INT (pr) = P_INT (pr, 0);
	PR_CheckEmptyString (pr, s);

	for (i = 0; i < MAX_MODELS; i++) {
		if (!sv.model_precache[i]) {
			sv.model_precache[i] = s;
			sv.models[i] = Mod_ForName (s, true);
			return;
		}
		if (!strcmp (sv.model_precache[i], s))
			return;
	}
	PR_RunError (pr, "PF_precache_model: overflow");
}

/*
	PF_walkmove

	float(float yaw, float dist) walkmove
*/
void
PF_walkmove (progs_t *pr)
{
	edict_t    *ent;
	float       yaw, dist;
	vec3_t      move;
	dfunction_t *oldf;
	int         oldself;

	ent = PROG_TO_EDICT (pr, *sv_globals.self);
	yaw = P_FLOAT (pr, 0);
	dist = P_FLOAT (pr, 1);

	if (!((int) SVfloat (ent, flags) & (FL_ONGROUND | FL_FLY | FL_SWIM))) {
		R_FLOAT (pr) = 0;
		return;
	}

	yaw = yaw * M_PI * 2 / 360;

	move[0] = cos (yaw) * dist;
	move[1] = sin (yaw) * dist;
	move[2] = 0;

// save program state, because SV_movestep may call other progs
	oldf = pr->pr_xfunction;
	oldself = *sv_globals.self;

	R_FLOAT (pr) = SV_movestep (ent, move, true);


// restore program state
	pr->pr_xfunction = oldf;
	*sv_globals.self = oldself;
}

/*
	PF_droptofloor

	void() droptofloor
*/
void
PF_droptofloor (progs_t *pr)
{
	edict_t    *ent;
	vec3_t      end;
	trace_t     trace;

	ent = PROG_TO_EDICT (pr, *sv_globals.self);

	VectorCopy (SVvector (ent, origin), end);
	end[2] -= 256;

	trace = SV_Move (SVvector (ent, origin),
					 SVvector (ent, mins),
					 SVvector (ent, maxs), end, false, ent);

	if (trace.fraction == 1 || trace.allsolid) {
		R_FLOAT (pr) = 0;
	} else {
		VectorCopy (trace.endpos, SVvector (ent, origin));
		SV_LinkEdict (ent, false);
		SVfloat (ent, flags) = (int) SVfloat (ent, flags) | FL_ONGROUND;
		SVentity (ent, groundentity) = EDICT_TO_PROG (pr, trace.ent);
		R_FLOAT (pr) = 1;
	}
}

/*
	PF_lightstyle

	void(float style, string value) lightstyle
*/
void
PF_lightstyle (progs_t *pr)
{
	int         style;
	char       *val;
	client_t   *client;
	int         j;

	style = P_FLOAT (pr, 0);
	val = P_STRING (pr, 1);

// change the string in sv
	sv.lightstyles[style] = val;

// send message to all clients on this server
	if (sv.state != ss_active)
		return;

	for (j = 0, client = svs.clients; j < svs.maxclients; j++, client++)
		if (client->active || client->spawned) {
			MSG_WriteByte (&client->message, svc_lightstyle);
			MSG_WriteByte (&client->message, style);
			MSG_WriteString (&client->message, val);
		}
}

void
PF_checkbottom (progs_t *pr)
{
	edict_t    *ent;

	ent = P_EDICT (pr, 0);

	R_FLOAT (pr) = SV_CheckBottom (ent);
}

void
PF_pointcontents (progs_t *pr)
{
	float      *v;

	v = P_VECTOR (pr, 0);

	R_FLOAT (pr) = SV_PointContents (v);
}

cvar_t     *sv_aim;

/*
	PF_aim

	Pick a vector for the player to shoot along
	vector aim(entity, missilespeed)
*/
void
PF_aim (progs_t *pr)
{
	edict_t    *ent, *check, *bestent;
	float       dist, bestdist, speed;
	int         i, j;
	trace_t     tr;
	vec3_t      start, dir, end, bestdir;

	ent = P_EDICT (pr, 0);
	speed = P_FLOAT (pr, 1);

	VectorCopy (SVvector (ent, origin), start);
	start[2] += 20;

// try sending a trace straight
	VectorCopy (*sv_globals.v_forward, dir);
	VectorMA (start, 2048, dir, end);
	tr = SV_Move (start, vec3_origin, vec3_origin, end, false, ent);
	if (tr.ent && SVfloat (tr.ent, takedamage) == DAMAGE_AIM
		&& (!teamplay->int_val || SVfloat (ent, team) <= 0
			|| SVfloat (ent, team) != SVfloat (tr.ent, team))) {
		VectorCopy (*sv_globals.v_forward, R_VECTOR (pr));
		return;
	}
// try all possible entities
	VectorCopy (dir, bestdir);
	bestdist = sv_aim->value;
	bestent = NULL;

	check = NEXT_EDICT (pr, sv.edicts);
	for (i = 1; i < sv.num_edicts; i++, check = NEXT_EDICT (pr, check)) {
		if (SVfloat (check, takedamage) != DAMAGE_AIM)
			continue;
		if (check == ent)
			continue;
		if (teamplay->int_val && SVfloat (ent, team) > 0
			&& SVfloat (ent, team) == SVfloat (check, team))
			continue;	// don't aim at teammate

		for (j = 0; j < 3; j++)
			end[j] = SVvector (check, origin)[j] + 0.5
				* (SVvector (check, mins)[j] + SVvector (check, maxs)[j]);
		VectorSubtract (end, start, dir);
		VectorNormalize (dir);
		dist = DotProduct (dir, *sv_globals.v_forward);
		if (dist < bestdist)
			continue;					// to far to turn
		tr = SV_Move (start, vec3_origin, vec3_origin, end, false, ent);
		if (tr.ent == check) {			// can shoot at this one
			bestdist = dist;
			bestent = check;
		}
	}

	if (bestent) {
		VectorSubtract (SVvector (bestent, origin), SVvector (ent, origin),
						dir);
		dist = DotProduct (dir, *sv_globals.v_forward);
		VectorScale (*sv_globals.v_forward, dist, end);
		end[2] = dir[2];
		VectorNormalize (end);
		VectorCopy (end, R_VECTOR (pr));
	} else {
		VectorCopy (bestdir, R_VECTOR (pr));
	}
}

/*
	PF_changeyaw

	This was a major timewaster in progs, so it was converted to C
*/
void
PF_changeyaw (progs_t *pr)
{
	edict_t    *ent;
	float       ideal, current, move, speed;

	ent = PROG_TO_EDICT (pr, *sv_globals.self);
	current = anglemod (SVvector (ent, angles)[1]);
	ideal = SVfloat (ent, ideal_yaw);
	speed = SVfloat (ent, yaw_speed);

	if (current == ideal)
		return;
	move = ideal - current;
	if (ideal > current) {
		if (move >= 180)
			move = move - 360;
	} else {
		if (move <= -180)
			move = move + 360;
	}
	if (move > 0) {
		if (move > speed)
			move = speed;
	} else {
		if (move < -speed)
			move = -speed;
	}

	SVvector (ent, angles)[1] = anglemod (current + move);
}

// MESSAGE WRITING ============================================================

#define	MSG_BROADCAST	0				// unreliable to all
#define	MSG_ONE			1				// reliable to one (msg_entity)
#define	MSG_ALL			2				// reliable to all
#define	MSG_INIT		3				// write to the init string

sizebuf_t  *
WriteDest (progs_t *pr)
{
	int         entnum;
	int         dest;
	edict_t    *ent;

	dest = P_FLOAT (pr, 0);
	switch (dest) {
		case MSG_BROADCAST:
			return &sv.datagram;

		case MSG_ONE:
			ent = PROG_TO_EDICT (pr, *sv_globals.msg_entity);
			entnum = NUM_FOR_EDICT (pr, ent);
			if (entnum < 1 || entnum > svs.maxclients)
				PR_RunError (pr, "WriteDest: not a client");
			return &svs.clients[entnum - 1].message;

		case MSG_ALL:
			return &sv.reliable_datagram;

		case MSG_INIT:
			return &sv.signon;

		default:
			PR_RunError (pr, "WriteDest: bad destination");
			break;
	}

	return NULL;
}

void
PF_WriteByte (progs_t *pr)
{
	MSG_WriteByte (WriteDest (pr), P_FLOAT (pr, 1));
}

void
PF_WriteChar (progs_t *pr)
{
	MSG_WriteByte (WriteDest (pr), P_FLOAT (pr, 1));
}

void
PF_WriteShort (progs_t *pr)
{
	MSG_WriteShort (WriteDest (pr), P_FLOAT (pr, 1));
}

void
PF_WriteLong (progs_t *pr)
{
	MSG_WriteLong (WriteDest (pr), P_FLOAT (pr, 1));
}

void
PF_WriteAngle (progs_t *pr)
{
	MSG_WriteAngle (WriteDest (pr), P_FLOAT (pr, 1));
}

void
PF_WriteCoord (progs_t *pr)
{
	MSG_WriteCoord (WriteDest (pr), P_FLOAT (pr, 1));
}

void
PF_WriteString (progs_t *pr)
{
	MSG_WriteString (WriteDest (pr), P_STRING (pr, 1));
}

void
PF_WriteEntity (progs_t *pr)
{
	MSG_WriteShort (WriteDest (pr), P_EDICTNUM (pr, 1));
}

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

void
PF_makestatic (progs_t *pr)
{
	edict_t    *ent;

	ent = P_EDICT (pr, 0);

	MSG_WriteByte (&sv.signon, svc_spawnstatic);

	MSG_WriteByte (&sv.signon,
				   SV_ModelIndex (PR_GetString (pr, SVstring (ent, model))));

	MSG_WriteByte (&sv.signon, SVfloat (ent, frame));
	MSG_WriteByte (&sv.signon, SVfloat (ent, colormap));
	MSG_WriteByte (&sv.signon, SVfloat (ent, skin));

	MSG_WriteCoordAngleV (&sv.signon, SVvector (ent, origin),
						  SVvector (ent, angles));
/*	for (i = 0; i < 3; i++) { // FIXME: DESPAIR
		MSG_WriteCoord (&sv.signon, SVvector (ent, origin)[i]);
		MSG_WriteAngle (&sv.signon, SVvector (ent, angles)[i]);
		} */

	// throw the entity away now
	ED_Free (pr, ent);
}

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

void
PF_setspawnparms (progs_t *pr)
{
	edict_t    *ent;
	int         i;
	client_t   *client;

	ent = P_EDICT (pr, 0);
	i = NUM_FOR_EDICT (pr, ent);
	if (i < 1 || i > svs.maxclients)
		PR_RunError (pr, "Entity is not a client");

	// copy spawn parms out of the client_t
	client = svs.clients + (i - 1);

	for (i = 0; i < NUM_SPAWN_PARMS; i++)
		sv_globals.parms[i] = client->spawn_parms[i];
}

void
PF_changelevel (progs_t *pr)
{
	char       *s;

	// make sure we don't issue two changelevels
	if (svs.changelevel_issued)
		return;
	svs.changelevel_issued = true;

	s = P_STRING (pr, 0);
	Cbuf_AddText (host_cbuf, va ("changelevel %s\n", s));
}


#define MAX_PF_HULLS 64		// FIXME make dynamic?
clip_hull_t *pf_hull_list[MAX_PF_HULLS];

static void
PF_hullpointcontents (progs_t *pr)
{
	edict_t    *edict = P_EDICT (pr, 0);
	float      *mins = P_VECTOR (pr, 1);
	float      *maxs = P_VECTOR (pr, 2);
	float      *point = P_VECTOR (pr, 3);
	hull_t     *hull;
	vec3_t      offset;

	hull = SV_HullForEntity (edict, mins, maxs, offset);
	VectorSubtract (point, offset, offset);
	R_INT (pr) = SV_HullPointContents (hull, 0, offset);
}

static void
PF_getboxbounds (progs_t *pr)
{
	int         h = P_INT (pr, 0) - 1;
	clip_hull_t *ch;

	if (h < 0 || h > MAX_PF_HULLS - 1 || !(ch = pf_hull_list[h]))
		PR_RunError (pr, "PF_freeboxhull: invalid box hull handle\n");

	if (P_INT (pr, 1)) {
		VectorCopy (ch->maxs, R_VECTOR (pr));
	} else {
		VectorCopy (ch->mins, R_VECTOR (pr));
	}
}

static void
PF_getboxhull (progs_t *pr)
{
	clip_hull_t *ch = 0;
	int         i;

	for (i = 0; i < MAX_PF_HULLS; i++) {
		if (!pf_hull_list[i]) {
			ch = MOD_Alloc_Hull (6, 6);
			break;
		}
	}

	if (ch) {
		pf_hull_list[i] = ch;
		R_INT (pr) = i + 1;
		for (i = 0; i < MAX_MAP_HULLS; i++)
			SV_InitHull (ch->hulls[i], ch->hulls[i]->clipnodes,
						 ch->hulls[i]->planes);
	} else {
		R_INT (pr) = 0;
	}
}

static void
PF_freeboxhull (progs_t *pr)
{
	int         h = P_INT (pr, 0) - 1;
	clip_hull_t *ch;

	if (h < 0 || h > MAX_PF_HULLS - 1 || !(ch = pf_hull_list[h]))
		PR_RunError (pr, "PF_freeboxhull: invalid box hull handle\n");
	pf_hull_list[h] = 0;
	MOD_Free_Hull (ch);
}

static vec_t
calc_dist (vec3_t p, vec3_t n, vec3_t *offsets)
{
	int        i;
	vec_t      d = DotProduct (p, n);
	vec3_t     s, v;

	VectorScale (n, d, s);
	for (i = 0; i < 3; i++)
		if (s[i] < 0)
			v[i] = offsets[0][i];
		else
			v[i] = offsets[1][i];
	VectorAdd (p, v, v);
	return DotProduct (v, n);
}

static void
PF_rotate_bbox (progs_t *pr)
{
	int         h = P_INT (pr, 0) - 1;
	float      *dir[3] = {
					P_VECTOR (pr, 1),
					P_VECTOR (pr, 2),
					P_VECTOR (pr, 3),
				};
	float      *mi = P_VECTOR (pr, 4);
	float      *ma = P_VECTOR (pr, 5);

	vec3_t      mins, maxs;
	float      *verts[6] = {maxs, mins, maxs, mins, maxs, mins};

	vec3_t      offsets[3][2] = {
					{ {   0,   0,   0 }, {  0,  0,  0} },
					{ { -16, -16, -32 }, { 16, 16, 24} },
					{ { -32, -32, -64 }, { 32, 32, 24} },
				};
	vec3_t      v[8], d;
	hull_t     *hull;
	clip_hull_t *ch;
	int         i, j;
	float       l;

	if (h < 0 || h > MAX_PF_HULLS - 1 || !(ch = pf_hull_list[h]))
		PR_RunError (pr, "PF_freeboxhull: invalid box hull handle\n");

	// set up the rotation matrix. the three orientation vectors form the
	// columns of the rotation matrix
	for (i = 0; i < 3; i++) {
		for (j = 0; j < 3; j++) {
			ch->axis[i][j] = dir[j][i];
		}
	}
	// rotate the bounding box points
	for (i = 0; i < 3; i++) {
		mins[i] = DotProduct (ch->axis[i], mi);
		maxs[i] = DotProduct (ch->axis[i], ma);
	}
	// find all 8 corners of the rotated box
	VectorCopy (mins, v[0]);
	VectorCopy (maxs, v[1]);
	VectorSubtract (maxs, mins, d);
	for (i = 0; i < 3; i++) {
		vec3_t      x;

		l = DotProduct (d, dir[i]);
		VectorScale    (dir[i], l, x);
		VectorAdd      (mins, x, v[2 + i * 2]);
		VectorSubtract (maxs, x, v[3 + i * 2]);
	}
	// now find the aligned bounding box
	VectorCopy (v[0], ch->mins);
	VectorCopy (v[0], ch->maxs);
	for (i = 0; i < 8; i++) {
		for (j = 0; j < 3; j++) {
			ch->mins[j] = min (ch->mins[j], v[i][j]);
			ch->maxs[j] = max (ch->maxs[j], v[i][j]);
		}
	}

	// set up the 3 size based hulls
	for (j = 0; j < 3; j++) {
		hull = ch->hulls[j];
		VectorScale (offsets[j][1], -1, hull->clip_mins);
		VectorScale (offsets[j][0], -1, hull->clip_maxs);
		// set up the clip planes
		for (i = 0; i < 6; i++) {
			hull->planes[i].dist = calc_dist (verts[i], dir[i / 2],
											  offsets[j]);
			hull->planes[i].type = 4;
			VectorCopy (dir[i / 2], hull->planes[i].normal);
		}
	}
}

void
PF_Fixme (progs_t *pr)
{
	PR_RunError (pr, "unimplemented bulitin");
}


void
PF_checkextension (progs_t *pr)
{
	G_FLOAT(pr, OFS_RETURN) = 0; //FIXME make this function actually useful :P
}

void
SV_PR_Cmds_Init ()
{
	PR_Cmds_Init (&sv_pr_state);
	PR_Obj_Progs_Init (&sv_pr_state);

	PR_AddBuiltin (&sv_pr_state, "makevectors", PF_makevectors, 1);	// void(entity e) makevectors
	PR_AddBuiltin (&sv_pr_state, "setorigin", PF_setorigin, 2);	// void(entity e, vector o) setorigin
	PR_AddBuiltin (&sv_pr_state, "setmodel", PF_setmodel, 3);	// void(entity e, string m) setmodel
	PR_AddBuiltin (&sv_pr_state, "setsize", PF_setsize, 4);	// void(entity e, vector min, vector max) setsize
	PR_AddBuiltin (&sv_pr_state, "fixme", PF_Fixme, 5);	// void(entity e, vector min, vector max) setabssize
	PR_AddBuiltin (&sv_pr_state, "sound", PF_sound, 8);	// void(entity e, float chan, string samp) sound
	PR_AddBuiltin (&sv_pr_state, "error", PF_error, 10);	// void(string e) error
	PR_AddBuiltin (&sv_pr_state, "objerror", PF_objerror, 11);	// void(string e) objerror
	PR_AddBuiltin (&sv_pr_state, "spawn", PF_Spawn, 14);	// entity() spawn
	PR_AddBuiltin (&sv_pr_state, "remove", PF_Remove, 15);	// void(entity e) remove
	PR_AddBuiltin (&sv_pr_state, "traceline", PF_traceline, 16);	// float(vector v1, vector v2, float tryents) traceline
	PR_AddBuiltin (&sv_pr_state, "checkclient", PF_checkclient, 17);	// entity() clientlist
	PR_AddBuiltin (&sv_pr_state, "precache_sound", PF_precache_sound, 19);	// void(string s) precache_sound
	PR_AddBuiltin (&sv_pr_state, "precache_model", PF_precache_model, 20);	// void(string s) precache_model
	PR_AddBuiltin (&sv_pr_state, "stuffcmd", PF_stuffcmd, 21);	// void(entity client, string s) stuffcmd
	PR_AddBuiltin (&sv_pr_state, "findradius", PF_findradius, 22);	// entity(vector org, float rad) findradius
	PR_AddBuiltin (&sv_pr_state, "bprint", PF_bprint, 23);	// void(string s) bprint
	PR_AddBuiltin (&sv_pr_state, "sprint", PF_sprint, 24);	// void(entity client, string s) sprint
	PR_AddBuiltin (&sv_pr_state, "walkmove", PF_walkmove, 32);	// float(float yaw, float dist) walkmove
	// 33
	PR_AddBuiltin (&sv_pr_state, "droptofloor", PF_droptofloor, 34);	// float() droptofloor
	PR_AddBuiltin (&sv_pr_state, "lightstyle", PF_lightstyle, 35);	// void(float style, string value) lightstyle
	// 39
	PR_AddBuiltin (&sv_pr_state, "checkbottom", PF_checkbottom, 40);	// float(entity e) checkbottom
	PR_AddBuiltin (&sv_pr_state, "pointcontents", PF_pointcontents, 41);	// float(vector v) pointcontents
	// 42
	PR_AddBuiltin (&sv_pr_state, "aim", PF_aim, 44);	// vector(entity e, float speed) aim
	PR_AddBuiltin (&sv_pr_state, "localcmd", PF_localcmd, 46);	// void(string s) localcmd
	PR_AddBuiltin (&sv_pr_state, "particle", PF_particle, 48);	// void(vector o, vector d, float color, float count) particle
	PR_AddBuiltin (&sv_pr_state, "changeyaw", PF_changeyaw, 49);	// void() ChangeYaw
	// 50

	PR_AddBuiltin (&sv_pr_state, "writebyte", PF_WriteByte, 52);	// void(float to, float f) WriteByte
	PR_AddBuiltin (&sv_pr_state, "writechar", PF_WriteChar, 53);	// void(float to, float f) WriteChar
	PR_AddBuiltin (&sv_pr_state, "writeshort", PF_WriteShort, 54);	// void(float to, float f) WriteShort
	PR_AddBuiltin (&sv_pr_state, "writelong", PF_WriteLong, 55);	// void(float to, float f) WriteLong
	PR_AddBuiltin (&sv_pr_state, "writecoord", PF_WriteCoord, 56);	// void(float to, float f) WriteCoord
	PR_AddBuiltin (&sv_pr_state, "writeangle", PF_WriteAngle, 57);	// void(float to, float f) WriteAngle
	PR_AddBuiltin (&sv_pr_state, "writestring", PF_WriteString, 58);	// void(float to, string s) WriteString
	PR_AddBuiltin (&sv_pr_state, "writeentity", PF_WriteEntity, 59);	// void(float to, entity s) WriteEntity

	PR_AddBuiltin (&sv_pr_state, "movetogoal", SV_MoveToGoal, 67);		// void(float step) movetogoal
	PR_AddBuiltin (&sv_pr_state, "precache_file", PF_precache_file, 68);	// string(string s) precache_file
	PR_AddBuiltin (&sv_pr_state, "makestatic", PF_makestatic, 69);	// void(entity e) makestatic

	PR_AddBuiltin (&sv_pr_state, "changelevel", PF_changelevel, 70);	// void(string s) changelevel
	// 71

	PR_AddBuiltin (&sv_pr_state, "centerprint", PF_centerprint, 73);	// void(...) centerprint

	PR_AddBuiltin (&sv_pr_state, "ambientsound", PF_ambientsound, 74);	// void(vector pos, string samp, float vol, float atten) ambientsound

	PR_AddBuiltin (&sv_pr_state, "precache_model2", PF_precache_model, 75);	// string(string s) precache_model2
	PR_AddBuiltin (&sv_pr_state, "precache_sound2", PF_precache_sound, 76);	// string(string s) precache_sound2
	PR_AddBuiltin (&sv_pr_state, "precache_file2", PF_precache_file, 77);	// string(string s) precache_file2

	PR_AddBuiltin (&sv_pr_state, "setspawnparms", PF_setspawnparms, 78);	// void(entity e) setspawnparms

	PR_AddBuiltin (&sv_pr_state, "hullpointcontents", PF_hullpointcontents, 93);    // integer (entity ent, vector point) hullpointcontents
	PR_AddBuiltin (&sv_pr_state, "getboxbounds", PF_getboxbounds, 94);  // vector (integer hull, integer max) getboxbounds
	PR_AddBuiltin (&sv_pr_state, "getboxhull", PF_getboxhull, 95);  // integer () getboxhull
	PR_AddBuiltin (&sv_pr_state, "freeboxhull", PF_freeboxhull, 96);    // void (integer hull) freeboxhull
	PR_AddBuiltin (&sv_pr_state, "rotate_bbox", PF_rotate_bbox, 97);    // void (integer hull, vector right, vector forward, vector up, vector mins, vector maxs) rotate_bbox

	PR_AddBuiltin (&sv_pr_state, "checkextension", PF_checkextension, 99);	// float () checkextension
}