/*
 * Copyright (C) 1997-2001 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.
 *
 * =======================================================================
 *
 * The Quake II CVAR subsystem. Implements dynamic variable tracking.
 *
 * =======================================================================
 */

#include "qcommon.h"

cvar_t	*cvar_vars;

static qboolean Cvar_InfoValidate (char *s)
{
	if (strstr (s, "\\"))
		return false;

	if (strstr (s, "\""))
		return false;

	if (strstr (s, ";"))
		return false;

	return true;
}

static cvar_t *Cvar_FindVar (const char *var_name)
{
	cvar_t	*var;

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

	return NULL;
}

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

	var = Cvar_FindVar (var_name);

	if (!var)
		return 0;

	return atof (var->string);
}

const char *Cvar_VariableString (const char *var_name)
{
	cvar_t *var;

	var = Cvar_FindVar (var_name);

	if (!var)
		return "";

	return var->string;
}

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

	len = (int)strlen(partial);

	if (!len)
		return NULL;

	/* check exact match */
	for (cvar=cvar_vars ; cvar ; cvar=cvar->next)
		if (!strcmp (partial,cvar->name))
			return cvar->name;

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

	return NULL;
}

/*
 * If the variable already exists, the value will not be set
 * The flags will be or'ed in if the variable exists.
 */
cvar_t *Cvar_Get (char *var_name, char *var_value, int flags)
{
	cvar_t	*var;

	if (flags & (CVAR_USERINFO | CVAR_SERVERINFO))
	{
		if (!Cvar_InfoValidate (var_name))
		{
			Com_Printf("invalid info cvar name\n");
			return NULL;
		}
	}

	var = Cvar_FindVar (var_name);

	if (var)
	{
		var->flags |= flags;
		return var;
	}

	if (!var_value)
		return NULL;

	if (flags & (CVAR_USERINFO | CVAR_SERVERINFO))
	{
		if (!Cvar_InfoValidate (var_value))
		{
			Com_Printf("invalid info cvar value\n");
			return NULL;
		}
	}

	var = Z_Malloc (sizeof(*var));
	var->name = CopyString (var_name);
	var->string = CopyString (var_value);
	var->modified = true;
	var->value = atof (var->string);

	/* link the variable in */
	var->next = cvar_vars;
	cvar_vars = var;

	var->flags = flags;

	return var;
}

cvar_t *Cvar_Set2 (char *var_name, char *value, qboolean force)
{
	cvar_t	*var;

	var = Cvar_FindVar (var_name);

	if (!var)
	{
		return Cvar_Get (var_name, value, 0);
	}

	if (var->flags & (CVAR_USERINFO | CVAR_SERVERINFO))
	{
		if (!Cvar_InfoValidate (value))
		{
			Com_Printf("invalid info cvar value\n");
			return var;
		}
	}

	if (!force)
	{
		if (var->flags & CVAR_NOSET)
		{
			Com_Printf ("%s is write protected.\n", var_name);
			return var;
		}

		if (var->flags & CVAR_LATCH)
		{
			if (var->latched_string)
			{
				if (strcmp(value, var->latched_string) == 0)
					return var;

				Z_Free (var->latched_string);
			}

			else
			{
				if (strcmp(value, var->string) == 0)
					return var;
			}

			if (Com_ServerState())
			{
				Com_Printf ("%s will be changed for next game.\n", var_name);
				var->latched_string = CopyString(value);
			}

			else
			{
				var->string = CopyString(value);
				var->value = (float)atof (var->string);

				if (!strcmp(var->name, "game"))
				{
					FS_SetGamedir (var->string);
					FS_ExecAutoexec ();
				}
			}

			return var;
		}
	}

	else
	{
		if (var->latched_string)
		{
			Z_Free (var->latched_string);
			var->latched_string = NULL;
		}
	}

	if (!strcmp(value, var->string))
		return var;

	var->modified = true;

	if (var->flags & CVAR_USERINFO)
		userinfo_modified = true;

	Z_Free (var->string);

	var->string = CopyString(value);
	var->value = atof (var->string);

	return var;
}

cvar_t *Cvar_ForceSet (char *var_name, char *value)
{
	return Cvar_Set2 (var_name, value, true);
}

cvar_t *Cvar_Set (char *var_name, char *value)
{
	return Cvar_Set2 (var_name, value, false);
}

cvar_t *Cvar_FullSet (char *var_name, char *value, int flags)
{
	cvar_t	*var;

	var = Cvar_FindVar (var_name);

	if (!var)
	{
		return Cvar_Get (var_name, value, flags);
	}

	var->modified = true;

	if (var->flags & CVAR_USERINFO)
		userinfo_modified = true;

	Z_Free (var->string);

	var->string = CopyString(value);
	var->value = (float)atof (var->string);

	var->flags = flags;

	return var;
}

void Cvar_SetValue (char *var_name, float value)
{
	char	val[32];

	if (value == (int)value)
		Com_sprintf (val, sizeof(val), "%i",(int)value);

	else
		Com_sprintf (val, sizeof(val), "%f",value);

	Cvar_Set (var_name, val);
}

/*
 * Any variables with latched values will now be updated
 */
void Cvar_GetLatchedVars (void)
{
	cvar_t	*var;

	for (var = cvar_vars ; var ; var = var->next)
	{
		if (!var->latched_string)
			continue;

		Z_Free (var->string);
		var->string = var->latched_string;
		var->latched_string = NULL;
		var->value = atof(var->string);

		if (!strcmp(var->name, "game"))
		{
			FS_SetGamedir (var->string);
			FS_ExecAutoexec ();
		}
	}
}

/*
 * 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)
		return false;

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

	Cvar_Set (v->name, Cmd_Argv(1));
	return true;
}

/*
 * Allows setting and defining of arbitrary cvars from console
 */
void Cvar_Set_f (void)
{
	int		c;
	int		flags;

	c = Cmd_Argc();

	if (c != 3 && c != 4)
	{
		Com_Printf ("usage: set <variable> <value> [u / s]\n");
		return;
	}

	if (c == 4)
	{
		if (!strcmp(Cmd_Argv(3), "u"))
			flags = CVAR_USERINFO;

		else if (!strcmp(Cmd_Argv(3), "s"))
			flags = CVAR_SERVERINFO;

		else
		{
			Com_Printf ("flags can only be 'u' or 's'\n");
			return;
		}

		Cvar_FullSet (Cmd_Argv(1), Cmd_Argv(2), flags);
	}

	else
		Cvar_Set (Cmd_Argv(1), Cmd_Argv(2));
}

/*
 * Appends lines containing "set variable value" for all variables
 * with the archive flag set to true.
 */
void Cvar_WriteVariables (char *path)
{
	cvar_t	*var;
	char	buffer[1024];
	FILE	*f;

	f = fopen (path, "a");

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

	fclose (f);
}

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

	i = 0;

	for (var = cvar_vars ; var ; var = var->next, i++)
	{
		if (var->flags & CVAR_ARCHIVE)
			Com_Printf ("*");

		else
			Com_Printf (" ");

		if (var->flags & CVAR_USERINFO)
			Com_Printf ("U");

		else
			Com_Printf (" ");

		if (var->flags & CVAR_SERVERINFO)
			Com_Printf ("S");

		else
			Com_Printf (" ");

		if (var->flags & CVAR_NOSET)
			Com_Printf ("-");

		else if (var->flags & CVAR_LATCH)
			Com_Printf ("L");

		else
			Com_Printf (" ");

		Com_Printf (" %s \"%s\"\n", var->name, var->string);
	}

	Com_Printf ("%i cvars\n", i);
}

qboolean userinfo_modified;

char *Cvar_BitInfo (int bit)
{
	static char	info[MAX_INFO_STRING];
	cvar_t	*var;

	info[0] = 0;

	for (var = cvar_vars ; var ; var = var->next)
	{
		if (var->flags & bit)
			Info_SetValueForKey (info, var->name, var->string);
	}

	return info;
}

/*
 * returns an info string containing
 * all the CVAR_USERINFO cvars
 */
char *Cvar_Userinfo (void)
{
	return Cvar_BitInfo (CVAR_USERINFO);
}

/*
 * returns an info string containing
 * all the CVAR_SERVERINFO cvars
 */
char	*Cvar_Serverinfo (void)
{
	return Cvar_BitInfo (CVAR_SERVERINFO);
}

/*
 * Reads in all archived cvars
 */
void Cvar_Init (void)
{
	Cmd_AddCommand ("set", Cvar_Set_f);
	Cmd_AddCommand ("cvarlist", Cvar_List_f);

}