/*
Copyright (C) 1996-2001 Id Software, Inc.
Copyright (C) 2002-2009 John Fitzgibbons and others
Copyright (C) 2010-2014 QuakeSpasm developers

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.

*/

#include "quakedef.h"

#define	STRINGTEMP_BUFFERS		16
#define	STRINGTEMP_LENGTH		1024
static	char	pr_string_temp[STRINGTEMP_BUFFERS][STRINGTEMP_LENGTH];
static	byte	pr_string_tempindex = 0;

char *PR_GetTempString (void)
{
	return pr_string_temp[(STRINGTEMP_BUFFERS-1) & ++pr_string_tempindex];
}

#define	RETURN_EDICT(e) (((int *)pr_globals)[OFS_RETURN] = EDICT_TO_PROG(e))

#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
#define MSG_EXT_MULTICAST	4	// temporary buffer that can be splurged more reliably / with more control.
#define MSG_EXT_ENTITY		5	// for csqc networking. we don't actually support this. I'm just defining it for completeness.

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

	BUILT-IN FUNCTIONS

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

char *PF_VarString (int	first)
{
	int		i;
	static char out[1024];
	size_t s;

	out[0] = 0;
	s = 0;
	for (i = first; i < pr_argc; i++)
	{
		s = q_strlcat(out, G_STRING((OFS_PARM0+i*3)), sizeof(out));
		if (s >= sizeof(out))
		{
			Con_Warning("PF_VarString: overflow (string truncated)\n");
			return out;
		}
	}
	if (s > 255)
		Con_DWarning("PF_VarString: %i characters exceeds standard limit of 255.\n", (int) s);
	return out;
}


/*
=================
PF_error

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

error(value)
=================
*/
static void PF_error (void)
{
	char	*s;
	edict_t	*ed;

	s = PF_VarString(0);
	Con_Printf ("======SERVER ERROR in %s:\n%s\n",
			PR_GetString(pr_xfunction->s_name), s);
	ed = PROG_TO_EDICT(pr_global_struct->self);
	ED_Print (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)
=================
*/
static void PF_objerror (void)
{
	char	*s;
	edict_t	*ed;

	s = PF_VarString(0);
	Con_Printf ("======OBJECT ERROR in %s:\n%s\n",
			PR_GetString(pr_xfunction->s_name), s);
	ed = PROG_TO_EDICT(pr_global_struct->self);
	ED_Print (ed);
	ED_Free (ed);

	//Host_Error ("Program error"); //johnfitz -- by design, this should not be fatal
}



/*
==============
PF_makevectors

Writes new values for v_forward, v_up, and v_right based on angles
makevectors(vector)
==============
*/
static void PF_makevectors (void)
{
	AngleVectors (G_VECTOR(OFS_PARM0), pr_global_struct->v_forward, pr_global_struct->v_right, pr_global_struct->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)
=================
*/
static void PF_setorigin (void)
{
	edict_t	*e;
	float	*org;

	e = G_EDICT(OFS_PARM0);
	org = G_VECTOR(OFS_PARM1);
	VectorCopy (org, e->v.origin);
	SV_LinkEdict (e, false);
}


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

	for (i = 0; i < 3; i++)
		if (minvec[i] > maxvec[i])
			PR_RunError ("backwards mins/maxs");

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

	if (!rotate)
	{
		VectorCopy (minvec, rmin);
		VectorCopy (maxvec, rmax);
	}
	else
	{
	// find min / max for rotations
		angles = e->v.angles;

		a = angles[1]/180 * M_PI;

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

		VectorCopy (minvec, bounds[0]);
		VectorCopy (maxvec, 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, e->v.mins);
	VectorCopy (rmax, e->v.maxs);
	VectorSubtract (maxvec, minvec, e->v.size);

	SV_LinkEdict (e, false);
}

/*
=================
PF_setsize

the size box is rotated by the current angle

setsize (entity, minvector, maxvector)
=================
*/
static void PF_setsize (void)
{
	edict_t	*e;
	float	*minvec, *maxvec;

	e = G_EDICT(OFS_PARM0);
	minvec = G_VECTOR(OFS_PARM1);
	maxvec = G_VECTOR(OFS_PARM2);
	SetMinMaxSize (e, minvec, maxvec, false);
}


/*
=================
PF_setmodel

setmodel(entity, model)
=================
*/
static void PF_setmodel (void)
{
	int		i;
	const char	*m, **check;
	qmodel_t	*mod;
	edict_t		*e;

	e = G_EDICT(OFS_PARM0);
	m = G_STRING(OFS_PARM1);

// 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 ("no precache: %s", m);
	}
	e->v.model = PR_SetEngineString(*check);
	e->v.modelindex = i; //SV_ModelIndex (m);

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

	if (mod)
	//johnfitz -- correct physics cullboxes for bmodels
	{
		if (mod->type == mod_brush)
			SetMinMaxSize (e, mod->clipmins, mod->clipmaxs, true);
		else
			SetMinMaxSize (e, mod->mins, mod->maxs, true);
	}
	//johnfitz
	else
		SetMinMaxSize (e, vec3_origin, vec3_origin, true);
}

/*
=================
PF_bprint

broadcast print to everyone on server

bprint(value)
=================
*/
static void PF_bprint (void)
{
	char		*s;

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

/*
=================
PF_sprint

single print to a specific client

sprint(clientent, value)
=================
*/
static void PF_sprint (void)
{
	char		*s;
	client_t	*client;
	int	entnum;

	entnum = G_EDICTNUM(OFS_PARM0);
	s = PF_VarString(1);

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

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

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


/*
=================
PF_centerprint

single print to a specific client

centerprint(clientent, value)
=================
*/
static void PF_centerprint (void)
{
	char		*s;
	client_t	*client;
	int	entnum;

	entnum = G_EDICTNUM(OFS_PARM0);
	s = PF_VarString(1);

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

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

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


/*
=================
PF_normalize

vector normalize(vector)
=================
*/
static void PF_normalize (void)
{
	float	*value1;
	vec3_t	newvalue;
	float	new_temp;

	value1 = G_VECTOR(OFS_PARM0);

	new_temp = value1[0] * value1[0] + value1[1] * value1[1] + value1[2]*value1[2];
	new_temp = sqrt (new_temp);

	if (new_temp == 0)
		newvalue[0] = newvalue[1] = newvalue[2] = 0;
	else
	{
		new_temp = 1 / new_temp;
		newvalue[0] = value1[0] * new_temp;
		newvalue[1] = value1[1] * new_temp;
		newvalue[2] = value1[2] * new_temp;
	}

	VectorCopy (newvalue, G_VECTOR(OFS_RETURN));
}

/*
=================
PF_vlen

scalar vlen(vector)
=================
*/
static void PF_vlen (void)
{
	float	*value1;
	float	new_temp;

	value1 = G_VECTOR(OFS_PARM0);

	new_temp = value1[0] * value1[0] + value1[1] * value1[1] + value1[2]*value1[2];
	new_temp = sqrt(new_temp);

	G_FLOAT(OFS_RETURN) = new_temp;
}

/*
=================
PF_vectoyaw

float vectoyaw(vector)
=================
*/
static void PF_vectoyaw (void)
{
	float	*value1;
	float	yaw;

	value1 = G_VECTOR(OFS_PARM0);

	if (value1[1] == 0 && value1[0] == 0)
		yaw = 0;
	else
	{
		yaw = (int) (atan2(value1[1], value1[0]) * 180 / M_PI);
		if (yaw < 0)
			yaw += 360;
	}

	G_FLOAT(OFS_RETURN) = yaw;
}


/*
=================
PF_vectoangles

vector vectoangles(vector)
=================
*/
static void PF_vectoangles (void)
{
	float	*value1;
	float	forward;
	float	yaw, pitch;

	value1 = G_VECTOR(OFS_PARM0);

	if (value1[1] == 0 && value1[0] == 0)
	{
		yaw = 0;
		if (value1[2] > 0)
			pitch = 90;
		else
			pitch = 270;
	}
	else
	{
		yaw = (int) (atan2(value1[1], value1[0]) * 180 / M_PI);
		if (yaw < 0)
			yaw += 360;

		forward = sqrt (value1[0]*value1[0] + value1[1]*value1[1]);
		pitch = (int) (atan2(value1[2], forward) * 180 / M_PI);
		if (pitch < 0)
			pitch += 360;
	}

	G_FLOAT(OFS_RETURN+0) = pitch;
	G_FLOAT(OFS_RETURN+1) = yaw;
	G_FLOAT(OFS_RETURN+2) = 0;
}

/*
=================
PF_Random

Returns a number from 0 <= num < 1

random()
=================
*/
static void PF_random (void)
{
	float		num;

	num = (rand() & 0x7fff) / ((float)0x7fff);

	G_FLOAT(OFS_RETURN) = num;
}

/*
=================
PF_particle

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

	org = G_VECTOR(OFS_PARM0);
	dir = G_VECTOR(OFS_PARM1);
	color = G_FLOAT(OFS_PARM2);
	count = G_FLOAT(OFS_PARM3);
	SV_StartParticle (org, dir, color, count);
}


/*
=================
PF_ambientsound

=================
*/
static void PF_ambientsound (void)
{
	const char	*samp, **check;
	float		*pos;
	float		vol, attenuation;
	int		i, soundnum;
	int		large = false; //johnfitz -- PROTOCOL_FITZQUAKE

	pos = G_VECTOR (OFS_PARM0);
	samp = G_STRING(OFS_PARM1);
	vol = G_FLOAT(OFS_PARM2);
	attenuation = G_FLOAT(OFS_PARM3);

// 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;
	}

	//johnfitz -- PROTOCOL_FITZQUAKE
	if (soundnum > 255)
	{
		if (sv.protocol == PROTOCOL_NETQUAKE)
			return; //don't send any info protocol can't support
		else
			large = true;
	}
	//johnfitz

// add an svc_spawnambient command to the level signon packet

	//johnfitz -- PROTOCOL_FITZQUAKE
	if (large)
		MSG_WriteByte (&sv.signon,svc_spawnstaticsound2);
	else
		MSG_WriteByte (&sv.signon,svc_spawnstaticsound);
	//johnfitz

	for (i = 0; i < 3; i++)
		MSG_WriteCoord(&sv.signon, pos[i], sv.protocolflags);

	//johnfitz -- PROTOCOL_FITZQUAKE
	if (large)
		MSG_WriteShort(&sv.signon, soundnum);
	else
		MSG_WriteByte (&sv.signon, soundnum);
	//johnfitz

	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.

=================
*/
static void PF_sound (void)
{
	const char	*sample;
	int		channel;
	edict_t		*entity;
	int		volume;
	float	attenuation;

	entity = G_EDICT(OFS_PARM0);
	channel = G_FLOAT(OFS_PARM1);
	sample = G_STRING(OFS_PARM2);
	volume = G_FLOAT(OFS_PARM3) * 255;
	attenuation = G_FLOAT(OFS_PARM4);

/*	Spike -- these checks are redundant
	if (volume < 0 || volume > 255)
		Host_Error ("SV_StartSound: volume = %i", volume);

	if (attenuation < 0 || attenuation > 4)
		Host_Error ("SV_StartSound: attenuation = %f", attenuation);

	if (channel < 0 || channel > 7)
		Host_Error ("SV_StartSound: channel = %i", channel);
*/
	SV_StartSound (entity, NULL, channel, sample, volume, attenuation);
}

/*
=================
PF_break

break()
=================
*/
static void PF_break (void)
{
	Con_Printf ("break statement\n");
	*(int *)-4 = 0;	// dump to debugger
//	PR_RunError ("break statement");
}

/*
=================
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)
=================
*/
static void PF_traceline (void)
{
	float	*v1, *v2;
	trace_t	trace;
	int	nomonsters;
	edict_t	*ent;

	v1 = G_VECTOR(OFS_PARM0);
	v2 = G_VECTOR(OFS_PARM1);
	nomonsters = G_FLOAT(OFS_PARM2);
	ent = G_EDICT(OFS_PARM3);

	/* FIXME FIXME FIXME: Why do we hit this with certain progs.dat ?? */
	if (developer.value) {
	  if (IS_NAN(v1[0]) || IS_NAN(v1[1]) || IS_NAN(v1[2]) ||
	      IS_NAN(v2[0]) || IS_NAN(v2[1]) || IS_NAN(v2[2])) {
	    Con_Warning ("NAN in traceline:\nv1(%f %f %f) v2(%f %f %f)\nentity %d\n",
		      v1[0], v1[1], v1[2], v2[0], v2[1], v2[2], NUM_FOR_EDICT(ent));
	  }
	}

	if (IS_NAN(v1[0]) || IS_NAN(v1[1]) || IS_NAN(v1[2]))
		v1[0] = v1[1] = v1[2] = 0;
	if (IS_NAN(v2[0]) || IS_NAN(v2[1]) || IS_NAN(v2[2]))
		v2[0] = v2[1] = v2[2] = 0;

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

	pr_global_struct->trace_allsolid = trace.allsolid;
	pr_global_struct->trace_startsolid = trace.startsolid;
	pr_global_struct->trace_fraction = trace.fraction;
	pr_global_struct->trace_inwater = trace.inwater;
	pr_global_struct->trace_inopen = trace.inopen;
	VectorCopy (trace.endpos, pr_global_struct->trace_endpos);
	VectorCopy (trace.plane.normal, pr_global_struct->trace_plane_normal);
	pr_global_struct->trace_plane_dist =  trace.plane.dist;
	if (trace.ent)
		pr_global_struct->trace_ent = EDICT_TO_PROG(trace.ent);
	else
		pr_global_struct->trace_ent = EDICT_TO_PROG(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)
=================
*/
#if 0
static void PF_checkpos (void)
{
}
#endif

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

static byte	checkpvs[MAX_MAP_LEAFS/8];

static int PF_newcheckclient (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(i);

		if (i == check)
			break;	// didn't find anything else

		if (ent->free)
			continue;
		if (ent->v.health <= 0)
			continue;
		if ((int)ent->v.flags & FL_NOTARGET)
			continue;

	// anything that is a client, or has a client as an enemy
		break;
	}

// get the PVS for the entity
	VectorAdd (ent->v.origin, ent->v.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;
}

/*
=================
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 ()
=================
*/
#define	MAX_CHECK	16
static int c_invis, c_notvis;
static void PF_checkclient (void)
{
	edict_t	*ent, *self;
	mleaf_t	*leaf;
	int		l;
	vec3_t	view;

// find a new check if on a new frame
	if (sv.time - sv.lastchecktime >= 0.1)
	{
		sv.lastcheck = PF_newcheckclient (sv.lastcheck);
		sv.lastchecktime = sv.time;
	}

// return check if it might be visible
	ent = EDICT_NUM(sv.lastcheck);
	if (ent->free || ent->v.health <= 0)
	{
		RETURN_EDICT(sv.edicts);
		return;
	}

// if current entity can't possibly see the check entity, return 0
	self = PROG_TO_EDICT(pr_global_struct->self);
	VectorAdd (self->v.origin, self->v.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(sv.edicts);
		return;
	}

// might be able to see it
	c_invis++;
	RETURN_EDICT(ent);
}

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


/*
=================
PF_stuffcmd

Sends text over to the client's execution buffer

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

	entnum = G_EDICTNUM(OFS_PARM0);
	if (entnum < 1 || entnum > svs.maxclients)
		PR_RunError ("Parm 0 not a client");
	str = G_STRING(OFS_PARM1);

	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)
=================
*/
static void PF_localcmd (void)
{
	const char	*str;

	str = G_STRING(OFS_PARM0);
	Cbuf_AddText (str);
}

/*
=================
PF_cvar

float cvar (string)
=================
*/
static void PF_cvar (void)
{
	const char	*str;

	str = G_STRING(OFS_PARM0);

	G_FLOAT(OFS_RETURN) = Cvar_VariableValue (str);
}

/*
=================
PF_cvar_set

float cvar (string)
=================
*/
static void PF_cvar_set (void)
{
	const char	*var, *val;

	var = G_STRING(OFS_PARM0);
	val = G_STRING(OFS_PARM1);

	Cvar_Set (var, val);
}

/*
=================
PF_findradius

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

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

	chain = (edict_t *)sv.edicts;

	org = G_VECTOR(OFS_PARM0);
	rad = G_FLOAT(OFS_PARM1);

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

		ent->v.chain = EDICT_TO_PROG(chain);
		chain = ent;
	}

	RETURN_EDICT(chain);
}

/*
=========
PF_dprint
=========
*/
static void PF_dprint (void)
{
	Con_DPrintf ("%s",PF_VarString(0));
}

static void PF_ftos (void)
{
	float	v;
	char	*s;

	v = G_FLOAT(OFS_PARM0);
	s = PR_GetTempString();
	if (v == (int)v)
		sprintf (s, "%d",(int)v);
	else
		sprintf (s, "%5.1f",v);
	G_INT(OFS_RETURN) = PR_SetEngineString(s);
}

static void PF_fabs (void)
{
	float	v;
	v = G_FLOAT(OFS_PARM0);
	G_FLOAT(OFS_RETURN) = fabs(v);
}

static void PF_vtos (void)
{
	char	*s;

	s = PR_GetTempString();
	sprintf (s, "'%5.1f %5.1f %5.1f'", G_VECTOR(OFS_PARM0)[0], G_VECTOR(OFS_PARM0)[1], G_VECTOR(OFS_PARM0)[2]);
	G_INT(OFS_RETURN) = PR_SetEngineString(s);
}

static void PF_Spawn (void)
{
	edict_t	*ed;

	ed = ED_Alloc();

	RETURN_EDICT(ed);
}

static void PF_Remove (void)
{
	edict_t	*ed;

	ed = G_EDICT(OFS_PARM0);
	ED_Free (ed);
}


// entity (entity start, .string field, string match) find = #5;
static void PF_Find (void)
{
	int		e;
	int		f;
	const char	*s, *t;
	edict_t	*ed;

	e = G_EDICTNUM(OFS_PARM0);
	f = G_INT(OFS_PARM1);
	s = G_STRING(OFS_PARM2);
	if (!s)
		PR_RunError ("PF_Find: bad search string");

	for (e++ ; e < sv.num_edicts ; e++)
	{
		ed = EDICT_NUM(e);
		if (ed->free)
			continue;
		t = E_STRING(ed,f);
		if (!t)
			continue;
		if (!strcmp(t,s))
		{
			RETURN_EDICT(ed);
			return;
		}
	}

	RETURN_EDICT(sv.edicts);
}

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

static void PF_precache_file (void)
{	// precache_file is only used to copy files with qcc, it does nothing
	G_INT(OFS_RETURN) = G_INT(OFS_PARM0);
}

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

	s = G_STRING(OFS_PARM0);
	G_INT(OFS_RETURN) = G_INT(OFS_PARM0);
	PR_CheckEmptyString (s);

	for (i = 0; i < MAX_SOUNDS; i++)
	{
		if (!sv.sound_precache[i])
		{
			if (sv.state != ss_loading)	//spike -- moved this so that there's no actual error any more.
			{
				Con_Warning("PF_precache_sound(\"%s\"): Precache should only be done in spawn functions\n", s);
				//let existing clients know about it
				MSG_WriteByte(&sv.reliable_datagram, svcdp_precache);
				MSG_WriteShort(&sv.reliable_datagram, i|0x8000);
				MSG_WriteString(&sv.reliable_datagram, s);
			}
			sv.sound_precache[i] = s;
			return;
		}
		if (!strcmp(sv.sound_precache[i], s))
		{
			if (sv.state != ss_loading && !pr_checkextension.value)
				Con_Warning("PF_precache_sound(\"%s\"): Precache should only be done in spawn functions\n", s);
			return;
		}
	}
	PR_RunError ("PF_precache_sound: overflow");
}

int SV_Precache_Model(const char *s)
{
	size_t i;
	for (i = 0; i < MAX_MODELS; i++)
	{
		if (!sv.model_precache[i])
		{
			if (sv.state != ss_loading)
			{
				//let existing clients know about it
				MSG_WriteByte(&sv.reliable_datagram, svcdp_precache);
				MSG_WriteShort(&sv.reliable_datagram, i|0x8000);
				MSG_WriteString(&sv.reliable_datagram, s);
			}

			sv.model_precache[i] = s;
			sv.models[i] = Mod_ForName (s, i==1);
			return i;
		}
		if (!strcmp(sv.model_precache[i], s))
			return i;
	}
	return 0;
}

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

	s = G_STRING(OFS_PARM0);
	G_INT(OFS_RETURN) = G_INT(OFS_PARM0);
	PR_CheckEmptyString (s);

	for (i = 0; i < MAX_MODELS; i++)
	{
		if (!sv.model_precache[i])
		{
			if (sv.state != ss_loading)
			{
				Con_Warning ("PF_precache_model(\"%s\"): Precache should only be done in spawn functions\n", s);
				//let existing clients know about it
				MSG_WriteByte(&sv.reliable_datagram, svcdp_precache);
				MSG_WriteShort(&sv.reliable_datagram, i|0x8000);
				MSG_WriteString(&sv.reliable_datagram, s);
			}

			sv.model_precache[i] = s;
			sv.models[i] = Mod_ForName (s, i==1);
			return;
		}
		if (!strcmp(sv.model_precache[i], s))
		{
			if (sv.state != ss_loading && !pr_checkextension.value)
				Con_Warning ("PF_precache_model(\"%s\"): Precache should only be done in spawn functions\n", s);
			return;
		}
	}
	PR_RunError ("PF_precache_model: overflow");
}


static void PF_coredump (void)
{
	ED_PrintEdicts ();
}

static void PF_traceon (void)
{
	pr_trace = true;
}

static void PF_traceoff (void)
{
	pr_trace = false;
}

static void PF_eprint (void)
{
	ED_PrintNum (G_EDICTNUM(OFS_PARM0));
}

/*
===============
PF_walkmove

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

	ent = PROG_TO_EDICT(pr_global_struct->self);
	yaw = G_FLOAT(OFS_PARM0);
	dist = G_FLOAT(OFS_PARM1);

	if ( !( (int)ent->v.flags & (FL_ONGROUND|FL_FLY|FL_SWIM) ) )
	{
		G_FLOAT(OFS_RETURN) = 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_xfunction;
	oldself = pr_global_struct->self;

	G_FLOAT(OFS_RETURN) = SV_movestep(ent, move, true);


// restore program state
	pr_xfunction = oldf;
	pr_global_struct->self = oldself;
}

/*
===============
PF_droptofloor

void() droptofloor
===============
*/
static void PF_droptofloor (void)
{
	edict_t		*ent;
	vec3_t		end;
	trace_t		trace;

	ent = PROG_TO_EDICT(pr_global_struct->self);

	VectorCopy (ent->v.origin, end);
	end[2] -= 256;

	trace = SV_Move (ent->v.origin, ent->v.mins, ent->v.maxs, end, false, ent);

	if (trace.fraction == 1 || trace.allsolid)
		G_FLOAT(OFS_RETURN) = 0;
	else
	{
		VectorCopy (trace.endpos, ent->v.origin);
		SV_LinkEdict (ent, false);
		ent->v.flags = (int)ent->v.flags | FL_ONGROUND;
		ent->v.groundentity = EDICT_TO_PROG(trace.ent);
		G_FLOAT(OFS_RETURN) = 1;
	}
}

/*
===============
PF_lightstyle

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

	style = G_FLOAT(OFS_PARM0);
	val = G_STRING(OFS_PARM1);

// 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_WriteChar (&client->message, svc_lightstyle);
			MSG_WriteChar (&client->message, style);
			MSG_WriteString (&client->message, val);
		}
	}
}

static void PF_rint (void)
{
	float	f;
	f = G_FLOAT(OFS_PARM0);
	if (f > 0)
		G_FLOAT(OFS_RETURN) = (int)(f + 0.5);
	else
		G_FLOAT(OFS_RETURN) = (int)(f - 0.5);
}

static void PF_floor (void)
{
	G_FLOAT(OFS_RETURN) = floor(G_FLOAT(OFS_PARM0));
}

static void PF_ceil (void)
{
	G_FLOAT(OFS_RETURN) = ceil(G_FLOAT(OFS_PARM0));
}


/*
=============
PF_checkbottom
=============
*/
static void PF_checkbottom (void)
{
	edict_t	*ent;

	ent = G_EDICT(OFS_PARM0);

	G_FLOAT(OFS_RETURN) = SV_CheckBottom (ent);
}

/*
=============
PF_pointcontents
=============
*/
static void PF_pointcontents (void)
{
	float	*v;

	v = G_VECTOR(OFS_PARM0);

	G_FLOAT(OFS_RETURN) = SV_PointContents (v);
}

/*
=============
PF_nextent

entity nextent(entity)
=============
*/
static void PF_nextent (void)
{
	int		i;
	edict_t	*ent;

	i = G_EDICTNUM(OFS_PARM0);
	while (1)
	{
		i++;
		if (i == sv.num_edicts)
		{
			RETURN_EDICT(sv.edicts);
			return;
		}
		ent = EDICT_NUM(i);
		if (!ent->free)
		{
			RETURN_EDICT(ent);
			return;
		}
	}
}

/*
=============
PF_aim

Pick a vector for the player to shoot along
vector aim(entity, missilespeed)
=============
*/
cvar_t	sv_aim = {"sv_aim", "1", CVAR_NONE}; // ericw -- turn autoaim off by default. was 0.93
static void PF_aim (void)
{
	edict_t	*ent, *check, *bestent;
	vec3_t	start, dir, end, bestdir;
	int		i, j;
	trace_t	tr;
	float	dist, bestdist;
	float	speed;

	ent = G_EDICT(OFS_PARM0);
	speed = G_FLOAT(OFS_PARM1);
	(void) speed; /* variable set but not used */

	VectorCopy (ent->v.origin, start);
	start[2] += 20;

// try sending a trace straight
	VectorCopy (pr_global_struct->v_forward, dir);
	VectorMA (start, 2048, dir, end);
	tr = SV_Move (start, vec3_origin, vec3_origin, end, false, ent);
	if (tr.ent && tr.ent->v.takedamage == DAMAGE_AIM
		&& (!teamplay.value || ent->v.team <= 0 || ent->v.team != tr.ent->v.team) )
	{
		VectorCopy (pr_global_struct->v_forward, G_VECTOR(OFS_RETURN));
		return;
	}

// try all possible entities
	VectorCopy (dir, bestdir);
	bestdist = sv_aim.value;
	bestent = NULL;

	check = NEXT_EDICT(sv.edicts);
	for (i = 1; i < sv.num_edicts; i++, check = NEXT_EDICT(check) )
	{
		if (check->v.takedamage != DAMAGE_AIM)
			continue;
		if (check == ent)
			continue;
		if (teamplay.value && ent->v.team > 0 && ent->v.team == check->v.team)
			continue;	// don't aim at teammate
		for (j = 0; j < 3; j++)
			end[j] = check->v.origin[j] + 0.5 * (check->v.mins[j] + check->v.maxs[j]);
		VectorSubtract (end, start, dir);
		VectorNormalize (dir);
		dist = DotProduct (dir, pr_global_struct->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 (bestent->v.origin, ent->v.origin, dir);
		dist = DotProduct (dir, pr_global_struct->v_forward);
		VectorScale (pr_global_struct->v_forward, dist, end);
		end[2] = dir[2];
		VectorNormalize (end);
		VectorCopy (end, G_VECTOR(OFS_RETURN));
	}
	else
	{
		VectorCopy (bestdir, G_VECTOR(OFS_RETURN));
	}
}

/*
==============
PF_changeyaw

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

	ent = PROG_TO_EDICT(pr_global_struct->self);
	current = anglemod( ent->v.angles[1] );
	ideal = ent->v.ideal_yaw;
	speed = ent->v.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;
	}

	ent->v.angles[1] = anglemod (current + move);
}

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

MESSAGE WRITING

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

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

	dest = G_FLOAT(OFS_PARM0);
	switch (dest)
	{
	case MSG_BROADCAST:
		return &sv.datagram;

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

	case MSG_ALL:
		return &sv.reliable_datagram;

	case MSG_INIT:
		return &sv.signon;

	case MSG_EXT_MULTICAST:
		return &sv.multicast;

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

	return NULL;
}

static void PF_WriteByte (void)
{
	MSG_WriteByte (WriteDest(), G_FLOAT(OFS_PARM1));
}

static void PF_WriteChar (void)
{
	MSG_WriteChar (WriteDest(), G_FLOAT(OFS_PARM1));
}

static void PF_WriteShort (void)
{
	MSG_WriteShort (WriteDest(), G_FLOAT(OFS_PARM1));
}

static void PF_WriteLong (void)
{
	MSG_WriteLong (WriteDest(), G_FLOAT(OFS_PARM1));
}

static void PF_WriteAngle (void)
{
	MSG_WriteAngle (WriteDest(), G_FLOAT(OFS_PARM1), sv.protocolflags);
}

static void PF_WriteCoord (void)
{
	MSG_WriteCoord (WriteDest(), G_FLOAT(OFS_PARM1), sv.protocolflags);
}

static void PF_WriteString (void)
{
	MSG_WriteString (WriteDest(), G_STRING(OFS_PARM1));
}

#define MSG_WriteEntity MSG_WriteShort	//fixme - replacement deltas encodes 0x8000+ in 24 bits
static void PF_WriteEntity (void)
{
	MSG_WriteEntity (WriteDest(), G_EDICTNUM(OFS_PARM1));
}

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

static void PF_makestatic (void)
{
	entity_state_t *st;
	edict_t	*ent;

	ent = G_EDICT(OFS_PARM0);

	if (sv.num_statics == sv.max_statics)
		PR_RunError ("PF_makestatic: Too many static entities");
	st = &sv.static_entities[sv.num_statics];
	SV_BuildEntityState(ent, st);
	if (st->alpha == ENTALPHA_ZERO)
		; //no point
	else
		sv.num_statics++;

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

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

/*
==============
PF_setspawnparms
==============
*/
static void PF_setspawnparms (void)
{
	edict_t	*ent;
	int		i;
	client_t	*client;

	ent = G_EDICT(OFS_PARM0);
	i = NUM_FOR_EDICT(ent);
	if (i < 1 || i > svs.maxclients)
		PR_RunError ("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++)
		(&pr_global_struct->parm1)[i] = client->spawn_parms[i];
}

/*
==============
PF_changelevel
==============
*/
static void PF_changelevel (void)
{
	const char	*s;

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

	s = G_STRING(OFS_PARM0);
	Cbuf_AddText (va("changelevel %s\n",s));
}

void PF_Fixme (void);
//{
//	PR_RunError ("unimplemented builtin");
//}

void PR_spawnfunc_misc_model(edict_t *self)
{
	eval_t *val;
	if (!self->v.model && (val = GetEdictFieldValue(self, ED_FindFieldOffset("mdl"))))
		self->v.model = val->string;
	if (!*PR_GetString(self->v.model)) //must have a model, because otherwise various things will assume its not valid at all.
		self->v.model = PR_SetEngineString("*null");

	if (self->v.angles[1] < 0)	//mimic AD. shame there's no avelocity clientside.
		self->v.angles[1] = (rand()*(360.0f/RAND_MAX));

	//make sure the model is precached, to avoid errors.
	G_INT(OFS_PARM0) = self->v.model;
	PF_precache_model();

	//and lets just call makestatic instead of worrying if it'll interfere with the rest of the qc.
	G_INT(OFS_PARM0) = EDICT_TO_PROG(self);
	PF_makestatic();
}

static builtin_t pr_builtin[] =
{
	PF_Fixme,
	PF_makevectors,		// void(entity e) makevectors		= #1
	PF_setorigin,		// void(entity e, vector o) setorigin	= #2
	PF_setmodel,		// void(entity e, string m) setmodel	= #3
	PF_setsize,		// void(entity e, vector min, vector max) setsize	= #4
	PF_Fixme,		// void(entity e, vector min, vector max) setabssize	= #5
	PF_break,		// void() break				= #6
	PF_random,		// float() random			= #7
	PF_sound,		// void(entity e, float chan, string samp) sound	= #8
	PF_normalize,		// vector(vector v) normalize		= #9
	PF_error,		// void(string e) error			= #10
	PF_objerror,		// void(string e) objerror		= #11
	PF_vlen,		// float(vector v) vlen			= #12
	PF_vectoyaw,		// float(vector v) vectoyaw		= #13
	PF_Spawn,		// entity() spawn			= #14
	PF_Remove,		// void(entity e) remove		= #15
	PF_traceline,		// float(vector v1, vector v2, float tryents) traceline	= #16
	PF_checkclient,		// entity() clientlist			= #17
	PF_Find,		// entity(entity start, .string fld, string match) find	= #18
	PF_precache_sound,	// void(string s) precache_sound	= #19
	PF_precache_model,	// void(string s) precache_model	= #20
	PF_stuffcmd,		// void(entity client, string s)stuffcmd	= #21
	PF_findradius,		// entity(vector org, float rad) findradius	= #22
	PF_bprint,		// void(string s) bprint		= #23
	PF_sprint,		// void(entity client, string s) sprint	= #24
	PF_dprint,		// void(string s) dprint		= #25
	PF_ftos,		// void(string s) ftos			= #26
	PF_vtos,		// void(string s) vtos			= #27
	PF_coredump,
	PF_traceon,
	PF_traceoff,
	PF_eprint,		// void(entity e) debug print an entire entity
	PF_walkmove,		// float(float yaw, float dist) walkmove
	PF_Fixme,		// float(float yaw, float dist) walkmove
	PF_droptofloor,
	PF_lightstyle,
	PF_rint,
	PF_floor,
	PF_ceil,
	PF_Fixme,
	PF_checkbottom,
	PF_pointcontents,
	PF_Fixme,
	PF_fabs,
	PF_aim,
	PF_cvar,
	PF_localcmd,
	PF_nextent,
	PF_particle,
	PF_changeyaw,
	PF_Fixme,
	PF_vectoangles,

	PF_WriteByte,
	PF_WriteChar,
	PF_WriteShort,
	PF_WriteLong,
	PF_WriteCoord,
	PF_WriteAngle,
	PF_WriteString,
	PF_WriteEntity,

	PF_Fixme,
	PF_Fixme,
	PF_Fixme,
	PF_Fixme,
	PF_Fixme,
	PF_Fixme,
	PF_Fixme,

	SV_MoveToGoal,
	PF_precache_file,
	PF_makestatic,

	PF_changelevel,
	PF_Fixme,

	PF_cvar_set,
	PF_centerprint,

	PF_ambientsound,

	PF_precache_model,
	PF_precache_sound,	// precache_sound2 is different only for qcc
	PF_precache_file,

	PF_setspawnparms
};

builtin_t *pr_builtins = pr_builtin;
int pr_numbuiltins = sizeof(pr_builtin)/sizeof(pr_builtin[0]);

