/* Emacs style mode select   -*- C++ -*- 
 *-----------------------------------------------------------------------------
 *
 *
 *  PrBoom a Doom port merged with LxDoom and LSDLDoom
 *  based on BOOM, a modified and improved DOOM engine
 *  Copyright (C) 1999 by
 *  id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
 *  Copyright (C) 1999-2000 by
 *  Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
 *  
 *  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.
 *
 * By Simon Howard, added to PrBoom by Florian Schulze
 *
 *-----------------------------------------------------------------------------
 */

#ifndef VARIABLE_H
#define VARIABLE_H

typedef struct svariable_s svariable_t;
#define VARIABLESLOTS 16

#include "m_fixed.h"
#include "t_parse.h"
#include "p_mobj.h"

// hash the variables for speed: this is the hashkey

#define variable_hash(n)                \
              (   ( (n)[0] + (n)[1] +   \
                   ((n)[1] ? (n)[2] +   \
                   ((n)[2] ? (n)[3]  : 0) : 0) ) % VARIABLESLOTS )

     // svariable_t
struct svariable_s
{
  char *name;
  int type;       // vt_string or vt_int: same as in svalue_t
  union
  {
    char *s;
    long i;
    mobj_t *mobj;
    fixed_t fixed;
    
    char **pS;              // pointer to game string
    int *pI;                // pointer to game int
    mobj_t **pMobj;         // pointer to game obj
    fixed_t *pFixed;
    
    void (*handler)();      // for functions
    char *labelptr;         // for labels
  } value;
  svariable_t *next;       // for hashing
};

// variable types

enum
{
  svt_string,
  svt_int,
  svt_mobj,         // a map object
  svt_function,     // functions are stored as variables
  svt_label,        // labels for goto calls are variables
  svt_const,        // const
  svt_fixed,        // fixed_t
  svt_pInt,         // pointer to game int
  svt_pString,      // pointer to game string
  svt_pMobj,        // pointer to game mobj
  svt_pFixed,       // pointer to fixed_t
};

// variables

void T_ClearHubScript();

void init_variables();
svariable_t *new_variable(script_t *script, char *name, int vtype);
svariable_t *find_variable(char *name);
svariable_t *variableforname(script_t *script, char *name);
svalue_t getvariablevalue(svariable_t *v);
void setvariablevalue(svariable_t *v, svalue_t newvalue);
void clear_variables(script_t *script);

svariable_t *add_game_int(char *name, int *var);
svariable_t *add_game_string(char *name, char **var);
svariable_t *add_game_mobj(char *name, mobj_t **mo);

// functions

svalue_t evaluate_function(int start, int stop);   // actually run a function
svariable_t *new_function(char *name, void (*handler)() );

// arguments to handler functions

#define MAXARGS 128
extern int t_argc;
extern svalue_t *t_argv;
extern svalue_t t_return;

#endif // VARIABLE_H