/*
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.

*/
// cvar.c -- dynamic variable tracking

#include "quakedef.h"

cvar_t	*cvar_vars;
char	*cvar_null_string = "";

cvar_t	cfg_savevars = {"cfg_savevars", "0"};

/*
============
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_VariableValue
============
*/
float Cvar_VariableValue (char *var_name)
{
	cvar_t	*var;
	
	if (!(var = Cvar_FindVar(var_name)))
		return 0;
	return Q_atof (var->string);
}


/*
============
Cvar_VariableString
============
*/
char *Cvar_VariableString (char *var_name)
{
	cvar_t	*var;
	
	if (!(var = Cvar_FindVar(var_name)))
		return cvar_null_string;
	return var->string;
}


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

	if (!(len = strlen(partial)))
		return NULL;

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

	return NULL;
}


/*
============
Cvar_CompleteCountPossible
============
*/
int Cvar_CompleteCountPossible (char *partial)
{
	cvar_t	*cvar;
	int	len, c = 0;

	if (!(len = strlen(partial)))
		return 0;

	// check partial match
	for (cvar = cvar_vars ; cvar ; cvar = cvar->next)
		if (!Q_strncasecmp(partial, cvar->name, len))
			c++;

	return c;
}


/*
============
Cvar_Set
============
*/
void Cvar_Set (char *var_name, char *value)
{
	cvar_t		*var;
	qboolean	changed;
	static qboolean	changing = false;
	
	if (!(var = Cvar_FindVar(var_name)))
	{	// there is an error in C code if this happens
		Con_Printf ("Cvar_Set: variable %s not found\n", var_name);
		return;
	}

	changed = strcmp (var->string, value);
	
	if (var->OnChange && !changing)
	{
		changing = true;
		if (var->OnChange(var, value))
		{
			changing = false;
			return;
		}
		changing = false;
	}

	Z_Free (var->string);	// free the old value string
	
	var->string = Z_Malloc (strlen(value)+1);
	Q_strcpy (var->string, value);
	var->value = Q_atof (var->string);
	if (var->server && changed && sv.active)
	{
		if (!(!strcmp(var_name, "cl_maxfps") && cl.gametype != GAME_DEATHMATCH && var->value > 72))
			SV_BroadcastPrintf ("\"%s\" changed to \"%s\"\n", var->name, var->string);
	}

	// joe, from ProQuake: rcon (64 doesn't mean anything special, but we need some extra space because NET_MAXMESSAGE == RCON_BUFF_SIZE)
	if (rcon_active && (rcon_message.cursize < rcon_message.maxsize - strlen(var->name) - strlen(var->string) - 64))
	{
		rcon_message.cursize--;
		MSG_WriteString (&rcon_message, va("\"%s\" set to \"%s\"\n", var->name, var->string));
	}

	if (!strcmp(var_name, "pq_lag"))
	{
		var->value = bound (0, var->value, 400);
		Cbuf_AddText (va("say \"ping +%d\"\n", (int)var->value));
	}
}

/*
============
Cvar_SetValue
============
*/
void Cvar_SetValue (char *var_name, float value)
{
	char	val[32];
	
	sprintf (val, "%f", value);
	Cvar_Set (var_name, val);
}


/*
============
Cvar_RegisterVariable

Adds a freestanding variable to the variable list.
============
*/
void Cvar_RegisterVariable (cvar_t *variable)
{
	char	*oldstr;
	
// first check to see if it has already been defined
	if (Cvar_FindVar(variable->name))
	{
		Con_Printf ("Can't register variable %s, already defined\n", variable->name);
		return;
	}
	
// check for overlap with a command
	if (Cmd_Exists(variable->name))
	{
		Con_Printf ("Cvar_RegisterVariable: %s is a command\n", variable->name);
		return;
	}
		
	variable->defaultvalue = CopyString (variable->string);

// copy the value off, because future sets will Z_Free it
	oldstr = variable->string;
	variable->string = Z_Malloc (strlen(variable->string)+1);	
	Q_strcpy (variable->string, oldstr);
	variable->value = Q_atof (variable->string);
	
// link the variable in
	variable->next = cvar_vars;
	cvar_vars = variable;
}

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

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

// check variables
	if (!(var = Cvar_FindVar(Cmd_Argv(0))))
		return false;
		
// perform a variable print or set
	if (Cmd_Argc() == 1)
	{
		Con_Printf ("\"%s\" is \"%s\"\n", var->name, var->string);
		return true;
	}

	Cvar_Set (var->name, 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->archive || (cfg_savevars.value == 1 && strcmp(var->string, var->defaultvalue)) || cfg_savevars.value == 2)
			fprintf (f, "%s \"%s\"\n", var->name, var->string);
}

void Cvar_Init (void)
{
	Cvar_RegisterVariable (&cfg_savevars);
}