/*
  Copyright (C) 2010-2011  Charles Pence <charles@charlespence.net>
  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 3 of the License, or
  (at your option) any later version.

  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/
#include "pch.h"
#include "quakedef.h"

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

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

                        BUILT-IN FUNCTIONS

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

char *PF_VarString (int    first)
{
    int        i;
    static char out[256];

    out[0] = 0;
    for (i=first ; i<pr_argc ; i++)
    {
        strcat (out, G_STRING((OFS_PARM0+i*3)));
    }
    return out;
}


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

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

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

    s = PF_VarString(0);
    Con_Printf ("======SERVER ERROR in %s:\n%s\n"
    ,pr_strings + 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)
=================
*/
void PF_objerror (void)
{
    char    *s;
    edict_t    *ed;

    s = PF_VarString(0);
    Con_Printf ("======OBJECT ERROR in %s:\n%s\n"
    ,pr_strings + 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)
==============
*/
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)
=================
*/
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);
}


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] = 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 (max, min, e->v.size);

    SV_LinkEdict (e, false);
}

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

the size box is rotated by the current angle

setsize (entity, minvector, maxvector)
=================
*/
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)
=================
*/
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 = m - pr_strings;
    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)
=================
*/
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)
=================
*/
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)
=================
*/
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)
=================
*/
void PF_normalize (void)
{
    float    *value1;
    vec3_t    newvalue;
    float    n;

    value1 = G_VECTOR(OFS_PARM0);

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

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

    VectorCopy (newvalue, G_VECTOR(OFS_RETURN));
}

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

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

    value1 = G_VECTOR(OFS_PARM0);

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

    G_FLOAT(OFS_RETURN) = n;
}

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

float vectoyaw(vector)
=================
*/
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)
=================
*/
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()
=================
*/
void PF_random (void)
{
    float        num;

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

    G_FLOAT(OFS_RETURN) = num;
}

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

particle(origin, color, count)
=================
*/
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

=================
*/
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.

=================
*/
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 ("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_break

break()
=================
*/
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)
=================
*/
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);
}

/*
=================
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 (void)
{
}

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

byte    checkpvs[MAX_MAP_LEAFS/8];

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
int c_invis, c_notvis;
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)
=================
*/
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)
=================
*/
void PF_localcmd (void)
{
    char    *str;

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

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

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

    str = G_STRING(OFS_PARM0);

    G_FLOAT(OFS_RETURN) = Cvar_VariableValue (str);
}

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

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

char    pr_string_temp[128];

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_string_temp - pr_strings;
}

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

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_string_temp - pr_strings;
}

void PF_etos (void)
{
    sprintf (pr_string_temp, "entity %i", G_EDICTNUM(OFS_PARM0));
    G_INT(OFS_RETURN) = pr_string_temp - pr_strings;
}

void PF_Spawn (void)
{
    edict_t    *ed;
    ed = ED_Alloc();
    RETURN_EDICT(ed);
}

void PF_Remove (void)
{
    edict_t    *ed;

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


// entity (entity start, .string field, string match) find = #5;
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);
}

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

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);
}

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");
}

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");
}


void PF_coredump (void)
{
    ED_PrintEdicts ();
}

void PF_traceon (void)
{
    pr_trace = true;
}

void PF_traceoff (void)
{
    pr_trace = false;
}

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

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

float(float yaw, float dist) walkmove
===============
*/
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
===============
*/
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
===============
*/
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);
        }
}

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


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

    ent = G_EDICT(OFS_PARM0);

    G_FLOAT(OFS_RETURN) = SV_CheckBottom (ent);
}

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

    v = G_VECTOR(OFS_PARM0);

    G_FLOAT(OFS_RETURN) = SV_PointContents (v);
}

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

entity nextent(entity)
=============
*/
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 (UNUSED))
=============
*/
void PF_aim (void)
{
    edict_t    *ent, *check, *bestent;
    vec3_t    start, dir, end, bestdir;
    int        i, j;
    trace_t    tr;
    float    dist, bestdist;

    ent = G_EDICT(OFS_PARM0);

    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 &&
        (!Cvar_VariableValue("teamplay") || 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 = Cvar_VariableValue("sv_aim");
    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 (Cvar_VariableValue("teamplay") && 
            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

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;
}

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

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

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

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

void PF_WriteAngle (void)
{
    MSG_WriteAngle (WriteDest(), G_FLOAT(OFS_PARM1));
}

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

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


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

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

int SV_ModelIndex (char *name);

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_strings + ent->v.model));

    MSG_WriteByte (&sv.signon, ent->v.frame);
    MSG_WriteByte (&sv.signon, ent->v.colormap == 0 ? 0 : 1);
    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
==============
*/
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
==============
*/
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));
}

void PF_sin (void)
{
    G_FLOAT(OFS_RETURN) = sin(G_FLOAT(OFS_PARM0));
}

void PF_cos (void)
{
    G_FLOAT(OFS_RETURN) = cos(G_FLOAT(OFS_PARM0));
}

void PF_sqrt (void)
{
    G_FLOAT(OFS_RETURN) = sqrt(G_FLOAT(OFS_PARM0));
}

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_sin,
PF_cos,
PF_sqrt,
PF_Fixme,
PF_Fixme,
PF_etos,
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]);

