/*
	cvar.c

	dynamic variable tracking

	Copyright (C) 1996-1997  Id Software, Inc.
	Copyright (C) 1999,2000  Nelson Rush.
	Copyright (C) 1999,2000  contributors of the QuakeForge project
	Please see the file "AUTHORS" for a list of contributors

	This program is free software; you can redistribute it and/or
	modify it under the terms of the GNU General Public License
	as published by the Free Software Foundation; either version 2
	of the License, or (at your option) any later version.

	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

	See the GNU General Public License for more details.

	You should have received a copy of the GNU General Public License
	along with this program; if not, write to:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

	$Id$
*/

#ifdef HAVE_CONFIG_H
# include <config.h>
#endif

#include "commdef.h"
#include "cvar.h"
#include "zone.h"
#include "console.h"
#include "qargs.h"
#include "cmd.h"
#include "commdef.h"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

cvar_t	*cvar_vars;
char	*cvar_null_string = "";
cvar_t	*developer;
cvar_alias_t *calias_vars;

/*
============
Cvar_FindVar
============
*/
cvar_t *Cvar_FindVar (char *var_name)
{
	cvar_t	*var;

	for (var=cvar_vars ; var ; var=var->next)
		if (!strcmp (var_name, var->name))
			return var;

	return NULL;
}

cvar_t *Cvar_FindAlias (char *alias_name)
{
	cvar_alias_t	*alias;

	for (alias = calias_vars ; alias ; alias=alias->next)
		if (!strcmp (alias_name, alias->name))
			return alias->cvar;
	return NULL;
}

void Cvar_Alias_Get (char *name, cvar_t *cvar)
{
	cvar_alias_t	*alias;
	cvar_t		*var;

	if (Cmd_Exists (name))
	{
		Con_Printf ("CAlias_Get: %s is a command\n", name);
		return;
	}
	if (Cvar_FindVar(name))
	{
		Con_Printf ("CAlias_Get: tried to alias used cvar name %s\n",name);
		return;
	}
	var = Cvar_FindAlias(name);	
	if (!var)
	{
		alias = (cvar_alias_t *) malloc(sizeof(cvar_alias_t));
		alias->next = calias_vars;
		calias_vars = alias;
		alias->name = strdup(name);	
		alias->cvar = cvar;
	}
}

/*
============
Cvar_VariableValue
============
*/
float	Cvar_VariableValue (char *var_name)
{
	cvar_t	*var;

	var = Cvar_FindVar (var_name);
	if (!var)
		var = Cvar_FindAlias(var_name);
	if (!var)
		return 0;
	return atof (var->string);
}


/*
============
Cvar_VariableString
============
*/
char *Cvar_VariableString (char *var_name)
{
	cvar_t *var;

	var = Cvar_FindVar (var_name);
	if (!var)
		var = Cvar_FindAlias(var_name);
	if (!var)
		return cvar_null_string;
	return var->string;
}


/*
============
Cvar_CompleteVariable
============
*/
char *Cvar_CompleteVariable (char *partial)
{
	cvar_t		*cvar;
	cvar_alias_t	*alias;
	int		len;

	len = strlen(partial);

	if (!len)
		return NULL;

	// check exact match
	for (cvar=cvar_vars ; cvar ; cvar=cvar->next)
		if (!stricmp (partial,cvar->name))
			return cvar->name;
	
	// check aliases too :)
	for (alias=calias_vars ; alias ; alias=alias->next)
		if (!stricmp (partial, alias->name))
			return alias->name;

	// check partial match
	for (cvar=cvar_vars ; cvar ; cvar=cvar->next)
		if (!strnicmp (partial,cvar->name, len))
			return cvar->name;

	// check aliases too :)
	for (alias=calias_vars ; alias ; alias=alias->next)
		if (!strnicmp (partial, alias->name, len))
			return alias->name;

	return NULL;
}


void Cvar_Info (cvar_t *var);

/*
============
Cvar_Set
============
*/
void Cvar_Set (cvar_t *var, char *value)
{
	if (!var)
		return;
	if(var->flags&CVAR_ROM)
		return;

	Z_Free (var->string);   // free the old value string

	var->string = Z_Malloc (strlen(value)+1);
	strcpy (var->string, value);
	var->value = atof (var->string);

	Cvar_Info(var);
}


/*
	Cvar_SetROM

	doesn't check for CVAR_ROM flag
*/
void Cvar_SetROM (cvar_t *var, char *value)
{
	if (!var)
		return;

	Z_Free (var->string);   // free the old value string

	var->string = Z_Malloc (strlen(value)+1);
	strcpy (var->string, value);
	var->value = atof (var->string);

	Cvar_Info(var);
}

/*
============
Cvar_SetValue
============
*/
void Cvar_SetValue (cvar_t *var_name, float value)
{
        Cvar_Set (var_name, va("%f", value));
}

/*
============
Cvar_Command

Handles variable inspection and changing from the console
============
*/
qboolean	Cvar_Command (void)
{
	cvar_t			*v;

// check variables
	v = Cvar_FindVar (Cmd_Argv(0));
	if (!v)
		v = Cvar_FindAlias (Cmd_Argv(0));
	if (!v)
		return false;

// perform a variable print or set
	if (Cmd_Argc() == 1)
	{
		Con_Printf ("\"%s\" is \"%s\"\n", v->name, v->string);
		return true;
	}

	Cvar_Set (v, Cmd_Argv(1));
	return true;
}


/*
============
Cvar_WriteVariables

Writes lines containing "set variable value" for all variables
with the archive flag set to true.
============
*/
void Cvar_WriteVariables (FILE *f)
{
	cvar_t	*var;

	for (var = cvar_vars ; var ; var = var->next)
		if (var->flags&CVAR_ARCHIVE)
			fprintf (f, "%s \"%s\"\n", var->name, var->string);
}

void Cvar_Set_f(void)
{
	cvar_t *var;
	char *value;
	char *var_name;

	if (Cmd_Argc() != 3)
	{
		Con_Printf ("usage: set <cvar> <value>\n");
		return;
	}
	var_name = Cmd_Argv (1);
	value = Cmd_Argv (2);
	var = Cvar_FindVar (var_name);
	if (!var)
		var = Cvar_FindAlias (var_name);
	if (var)
	{
		Cvar_Set (var, value);
	}
	else
	{
		var = Cvar_Get (var_name, value, CVAR_USER_CREATED|CVAR_HEAP,
				"User created cvar");
	}
}

void Cvar_Setrom_f(void)
{
	cvar_t *var;
	char *value;
	char *var_name;

	if (Cmd_Argc() != 2)
	{
		Con_Printf ("usage: setrom <cvar>\n");
		return;
	}
	var_name = Cmd_Argv (1);
	value = Cmd_Argv (2);
	var = Cvar_FindVar (var_name);
	if (!var)
		var = Cvar_FindAlias (var_name);
	if (var)
	{
		var->flags |= CVAR_ROM;
	}
	else
	{
		Con_Printf ("cvar %s not found\n", var_name);
	}
}

void Cvar_Toggle_f (void)
{
	cvar_t *var;

	if (Cmd_Argc() != 2)
	{
		Con_Printf ("toggle <cvar> : toggle a cvar on/off\n");
		return;
	}

	var = Cvar_FindVar (Cmd_Argv(1));
	if (!var)
		var = Cvar_FindAlias(Cmd_Argv(1));
	if (!var)
	{
		Con_Printf ("Unknown variable \"%s\"\n", Cmd_Argv(1));
		return;
	}

	Cvar_Set (var, var->value ? "0" : "1");
}

void Cvar_Help_f (void)
{
	char	*var_name;
	cvar_t	*var;

	if (Cmd_Argc() != 2)
	{
		Con_Printf ("usage: help <cvar>\n");
		return;
	}

	var_name = Cmd_Argv (1);
	var = Cvar_FindVar (var_name);
	if (!var)
		var = Cvar_FindAlias (var_name);
	if (var)
	{
		Con_Printf ("%s\n",var->description);
		return;
	}
	Con_Printf ("variable not found\n");
}

void Cvar_CvarList_f (void)
{
	cvar_t	*var;
	int i;

	for (var=cvar_vars, i=0 ; var ; var=var->next, i++)
	{
		Con_Printf("%s\n",var->name);
	}
	Con_Printf ("------------\n%d variables\n", i);
}

void Cvar_Init()
{
	developer = Cvar_Get ("developer","0",0,"None");

	Cmd_AddCommand ("set", Cvar_Set_f);
	Cmd_AddCommand ("setrom", Cvar_Setrom_f);
	Cmd_AddCommand ("toggle", Cvar_Toggle_f);
	Cmd_AddCommand ("help",Cvar_Help_f);
	Cmd_AddCommand ("cvarlist",Cvar_CvarList_f);
}

void Cvar_Shutdown (void)
{
	cvar_t	*var,*next;
	cvar_alias_t	*alias,*nextalias;

	// Free cvars
	var = cvar_vars;
	while(var)
	{
		next = var->next;
		free(var->description);
		Z_Free(var->string);
		free(var->name);
		free(var);
		var = next;
	}
	// Free aliases 
	alias = calias_vars;
	while(alias)
	{
		nextalias = alias->next;
		free(alias->name);
		free(alias);
		alias = nextalias;
	}
}


cvar_t *Cvar_Get(char *name, char *string, int cvarflags, char *description)
{

	cvar_t		*v;

	if (Cmd_Exists (name))
	{
		Con_Printf ("Cvar_Get: %s is a command\n",name);
		return NULL;
	}
	v = Cvar_FindVar(name);
	if (!v)
	{
		v = (cvar_t *) malloc(sizeof(cvar_t));
		// Cvar doesn't exist, so we create it
		v->next = cvar_vars;
		cvar_vars = v;
		v->name = strdup(name);
		v->string = Z_Malloc (strlen(string)+1);
		strcpy (v->string, string);
		v->flags = cvarflags;
		v->description = strdup(description);
		v->value = atof (v->string);
		return v;
	}
	// Cvar does exist, so we update the flags and return.
	v->flags ^= CVAR_USER_CREATED;
	v->flags ^= CVAR_HEAP;
	v->flags |= cvarflags;
	if (!strcmp (v->description,"User created cvar"))
	{	
		// Set with the real description
		free(v->description);
		v->description = strdup (description);
	}
	return v;
}

/*
	Cvar_SetFlags

	sets a Cvar's flags simply and easily
*/
void
Cvar_SetFlags (cvar_t *var, int cvarflags)
{
	if (var == NULL)
		return;

	var->flags = cvarflags;
}