/*
	qargs.c

	command line argument processing routines

	Copyright (C) 1996-1997  Id Software, Inc.
	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

*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif

#include <ctype.h>
#include <stdlib.h>
#include <assert.h>

#include "QF/cmd.h"
#include "QF/crc.h"
#include "QF/cvar.h"
#include "QF/idparse.h"
#include "QF/qargs.h"
#include "QF/quakefs.h"
#include "QF/qtypes.h"
#include "QF/sys.h"
#include "QF/va.h"

char *fs_globalcfg;
static cvar_t fs_globalcfg_cvar = {
	.name = "fs_globalcfg",
	.description =
		"global configuration file",
	.default_value = FS_GLOBALCFG,
	.flags = CVAR_ROM,
	.value = { .type = 0, .value = &fs_globalcfg },
};
char *fs_usercfg;
static cvar_t fs_usercfg_cvar = {
	.name = "fs_usercfg",
	.description =
		"user configuration file",
	.default_value = FS_USERCFG,
	.flags = CVAR_ROM,
	.value = { .type = 0, .value = &fs_usercfg },
};

static const char **largv;
static const char *argvdummy = " ";

static const char *safeargvs[] =
	{ "-stdvid", "-nolan", "-nosound", "-nocdaudio", "-nojoy", "-nomouse",
		"-dibonly" };

#define NUM_SAFE_ARGVS ((int) (sizeof(safeargvs)/sizeof(safeargvs[0])))

VISIBLE int         com_argc;
VISIBLE const char **com_argv;
const char *com_cmdline;

VISIBLE qboolean    nouse = false;		// 1999-10-29 +USE fix by Maddes


/*
	COM_CheckParm

	Returns the position (1 to argc-1) in the program's argument list
	where the given parameter apears, or 0 if not present
*/
VISIBLE int
COM_CheckParm (const char *parm)
{
	int         i;

	for (i = 1; i < com_argc; i++) {
		if (!com_argv[i])
			continue;					// NEXTSTEP sometimes clears appkit
										// vars.
		if (!strcmp (parm, com_argv[i]))
			return i;
	}

	return 0;
}

VISIBLE void
COM_InitArgv (int argc, const char **argv)
{
	qboolean    safe;
	int         i, len;
	char       *cmdline;

	safe = false;

	largv = (const char **) calloc (1, (argc + NUM_SAFE_ARGVS + 1) *
									sizeof (const char *));

	for (com_argc = 0, len = 0; com_argc < argc; com_argc++) {
		largv[com_argc] = argv[com_argc];
		if ((argv[com_argc]) && !strcmp ("-safe", argv[com_argc]))
			safe = true;
		if (argv[com_argc])
			len += strlen (argv[com_argc]) + 1;
	}

	cmdline = (char *) calloc (1, len + 1);	// need strlen(cmdline)+2
	cmdline[0] = 0;
	if (len) {
		for (i = 1; i < argc; i++) {
			strncat (cmdline, argv[i], len - strlen (cmdline));
			assert (len - strlen (cmdline) > 0);
			strncat (cmdline, " ", len - strlen (cmdline));
		}
		cmdline[len - 1] = '\0';
	}
	com_cmdline = cmdline;

	if (safe) {
		// force all the safe-mode switches. Note that we reserved extra space
		// in case we need to add these, so we don't need an overflow check
		for (i = 0; i < NUM_SAFE_ARGVS; i++) {
			largv[com_argc] = safeargvs[i];
			com_argc++;
		}
	}

	largv[com_argc] = argvdummy;
	com_argv = largv;

	if (COM_CheckParm ("-nouse")) {
		nouse = true;
	}
}

/*
	COM_AddParm

	Adds the given string at the end of the current argument list
*/
void
COM_AddParm (const char *parm)
{
	largv[com_argc++] = parm;
}

void
COM_ParseConfig (cbuf_t *cbuf)
{
	// execute +set as early as possible
	Cmd_StuffCmds (cbuf);
	Cbuf_Execute_Sets (cbuf);

	// execute set commands in the global configuration file if it exists
	Cvar_Register (&fs_globalcfg_cvar, 0, 0);
	Cmd_Exec_File (cbuf, fs_globalcfg, 0);
	Cbuf_Execute_Sets (cbuf);

	// execute +set again to override the config file
	Cmd_StuffCmds (cbuf);
	Cbuf_Execute_Sets (cbuf);

	// execute set commands in the user configuration file if it exists
	Cvar_Register (&fs_usercfg_cvar, 0, 0);
	Cmd_Exec_File (cbuf, fs_usercfg, 0);
	Cbuf_Execute_Sets (cbuf);

	// execute +set again to override the config file
	Cmd_StuffCmds (cbuf);
	Cbuf_Execute_Sets (cbuf);
}

int
COM_Check_quakerc (const char *cmd, cbuf_t *cbuf)
{
	const char *l, *p;
	int ret = 0;
	QFile *f;

	f = QFS_FOpenFile ("quake.rc");
	while (f && (l = Qgetline (f))) {
		if ((p = strstr (l, cmd))) {
			if (p == l) {
				if (cbuf) {
					Cbuf_AddText (cbuf, l);
				}
				ret = 1;
				break;
			}
		}
	}
	Qclose (f);
	return ret;
}

void
COM_ExecConfig (cbuf_t *cbuf, int skip_quakerc)
{
	// quakeforge.cfg overrides quake.rc as it contains quakeforge-specific
	// commands. If it doesn't exist, then this is the first time quakeforge
	// has been used in this installation, thus any existing legacy config
	// should be used to set up defaults on the assumption that the user has
	// things set up to work with another (hopefully compatible) client
	if (Cmd_Exec_File (cbuf, "quakeforge.cfg", 1)) {
		Cmd_Exec_File (cbuf, fs_usercfg, 0);
		Cmd_StuffCmds (cbuf);
		COM_Check_quakerc ("startdemos", cbuf);
	} else {
		if (!skip_quakerc) {
			Cbuf_InsertText (cbuf, "exec quake.rc\n");
		}
		Cmd_Exec_File (cbuf, fs_usercfg, 0);
		// Reparse the command line for + commands.
		// (sets still done, but it doesn't matter)
		// (Note, no non-base commands exist yet)
		if (skip_quakerc || !COM_Check_quakerc ("stuffcmds", 0)) {
			Cmd_StuffCmds (cbuf);
		}
	}
}

static void
qargs_shutdown (void *data)
{
	free (largv);
	free ((char *) com_cmdline);
}

static void __attribute__((constructor))
qargs_init (void)
{
	Sys_RegisterShutdown (qargs_shutdown, 0);
}