/*
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.

*/

#include <float.h>

#include "quakedef.h"
#include "host.h"
#include "progs.h"
#include "console.h"
#include "server.h"
#include "protocol.h"
#include "sys.h"
#include "world.h"
#include "cmd.h"

#ifdef GLQUAKE
# include "gl_model.h"
#else
# include "model.h"
#endif

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

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

						BUILT-IN FUNCTIONS

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

static char *
PF_VarString(int first)
{
    int i, len = 0;
    static char out[512];
    char *arg;

    out[0] = 0;
    for (i = first; i < pr_argc; i++) {
	arg = G_STRING((OFS_PARM0 + i * 3));
	len += strlen(arg);
	if (len > 511) {
	    Con_DPrintf("%s: overflow (string truncated)\n", __func__);
	    break;
	}
	strcat(out, arg);
    }
    return out;
}


/*
=================
PF_errror

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");
}



/*
==============
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 *min, float *max, 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 (min[i] > max[i])
	    PR_RunError("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 = 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(min, bounds[0]);
	VectorCopy(max, bounds[1]);

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

	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(max, min, 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 *min, *max;

    e = G_EDICT(OFS_PARM0);
    min = G_VECTOR(OFS_PARM1);
    max = G_VECTOR(OFS_PARM2);
    SetMinMaxSize(e, min, max, false);
}


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

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

    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\n", m);

    e->v.model = PR_SetString(m);
    e->v.modelindex = i;			//SV_ModelIndex (m);

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

    if (mod)
	SetMinMaxSize(e, mod->mins, mod->maxs, true);
    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;

    value1 = G_VECTOR(OFS_PARM0);

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

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

    VectorCopy(newvalue, G_VECTOR(OFS_RETURN));
}

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

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

    value1 = G_VECTOR(OFS_PARM0);

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

    G_FLOAT(OFS_RETURN) = new;
}

/*
=================
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)
{
    char **check;
    char *samp;
    float *pos;
    float vol, attenuation;
    int i, soundnum;

    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;
    }
// add an svc_spawnambient command to the level signon packet

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

    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
allready 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)
{
    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);

    if (volume < 0 || volume > 255)
	Sys_Error("%s: volume = %i", __func__, volume);

    if (attenuation < 0 || attenuation > 4)
	Sys_Error("%s: attenuation = %f", __func__, attenuation);

    if (channel < 0 || channel > 7)
	Sys_Error("%s: channel = %i", __func__, channel);

    SV_StartSound(entity, 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);

    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);
}

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

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;
    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)
{
    char *str;

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

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

float cvar (string)
=================
*/
static void
PF_cvar(void)
{
    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)
{
    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 (Length(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 char pr_string_temp[128];

static void
PF_ftos(void)
{
    float v;

    v = G_FLOAT(OFS_PARM0);

    if (v == (int)v)
	sprintf(pr_string_temp, "%d", (int)v);
    else
	sprintf(pr_string_temp, "%5.1f", v);
    G_INT(OFS_RETURN) = PR_SetString(pr_string_temp);
}

static void
PF_fabs(void)
{
    float v;

    v = G_FLOAT(OFS_PARM0);
    G_FLOAT(OFS_RETURN) = fabs(v);
}

static void
PF_vtos(void)
{
    sprintf(pr_string_temp, "'%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_SetString(pr_string_temp);
}

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;
    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(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)
{
    char *s;
    int i;

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

    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]) {
	    sv.sound_precache[i] = s;
	    return;
	}
	if (!strcmp(sv.sound_precache[i], s))
	    return;
    }
    PR_RunError("PF_precache_sound: overflow");
}

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

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

    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]) {
	    sv.model_precache[i] = s;
	    sv.models[i] = Mod_ForName(s, true);
	    return;
	}
	if (!strcmp(sv.model_precache[i], 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;
    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", "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);

    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

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

#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     */

static 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;

    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));
}

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

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


static void
PF_WriteEntity(void)
{
    MSG_WriteShort(WriteDest(), G_EDICTNUM(OFS_PARM1));
}

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

static void
PF_makestatic(void)
{
    edict_t *ent;
    int i;

    ent = G_EDICT(OFS_PARM0);

    MSG_WriteByte(&sv.signon, svc_spawnstatic);
    MSG_WriteByte(&sv.signon, SV_ModelIndex(PR_GetString(ent->v.model)));
    MSG_WriteByte(&sv.signon, ent->v.frame);
    MSG_WriteByte(&sv.signon, ent->v.colormap);
    MSG_WriteByte(&sv.signon, ent->v.skin);

    for (i = 0; i < 3; i++) {
	MSG_WriteCoord(&sv.signon, ent->v.origin[i]);
	MSG_WriteAngle(&sv.signon, ent->v.angles[i]);
    }

    /* 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)
{
    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));
}


static void
PF_Fixme(void)
{
    PR_RunError("unimplemented bulitin");
}



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]);
