/*
 * Option parsing
 *
 * Copyright 2000 Alexandre Julliard
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include "config.h"
#include <string.h>
#include <stdlib.h>

#include "winbase.h"
#include "winnls.h"
#include "winternl.h"
#include "wine/library.h"
#include "options.h"
#include "module.h"
#include "wine/debug.h"

struct option_descr
{
    const char *longname;
    char        shortname;
    int         has_arg;
    int         inherit;
    void      (*func)( const char *arg );
    const char *usage;
};

const char *argv0;       /* the original argv[0] */
const char *full_argv0;  /* the full path of argv[0] (if known) */

static char *inherit_str;  /* options to pass to child processes */

static void out_of_memory(void) WINE_NORETURN;
static void out_of_memory(void)
{
    MESSAGE( "Virtual memory exhausted\n" );
    ExitProcess(1);
}

static void do_debugmsg( const char *arg );
static void do_help( const char *arg );
static void do_version( const char *arg );

static const struct option_descr option_table[] =
{
    { "debugmsg",     0, 1, 1, do_debugmsg,
      "--debugmsg name  Turn debugging-messages on or off" },
    { "dll",          0, 1, 1, MODULE_AddLoadOrderOption,
      "--dll name       Enable or disable built-in DLLs" },
    { "help",       'h', 0, 0, do_help,
      "--help,-h        Show this help message" },
    { "version",    'v', 0, 0, do_version,
      "--version,-v     Display the Wine version" },
    { NULL,           0, 0, 0, NULL, NULL }  /* terminator */
};


static void do_help( const char *arg )
{
    OPTIONS_Usage();
}

static void do_version( const char *arg )
{
    MESSAGE( "%s\n", PACKAGE_STRING );
    ExitProcess(0);
}

static void do_debugmsg( const char *arg )
{
    if (wine_dbg_parse_options( arg ))
    {
        MESSAGE("%s: Syntax: --debugmsg [class]+xxx,...  or -debugmsg [class]-xxx,...\n", argv0);
        MESSAGE("Example: --debugmsg +all,warn-heap\n"
                "  turn on all messages except warning heap messages\n");
        MESSAGE("Available message classes: err, warn, fixme, trace\n\n");
        ExitProcess(1);
    }
}


static void remove_options( char *argv[], int pos, int count, int inherit )
{
    if (inherit)
    {
        int i, len = 0;
        for (i = 0; i < count; i++) len += strlen(argv[pos+i]) + 1;
        if (inherit_str)
        {
            if (!(inherit_str = realloc( inherit_str, strlen(inherit_str) + 1 + len )))
                out_of_memory();
            strcat( inherit_str, " " );
        }
        else
        {
            if (!(inherit_str = malloc( len ))) out_of_memory();
            inherit_str[0] = 0;
        }
        for (i = 0; i < count; i++)
        {
            strcat( inherit_str, argv[pos+i] );
            if (i < count-1) strcat( inherit_str, " " );
        }
    }
    while ((argv[pos] = argv[pos+count])) pos++;
}

/* parse options from the argv array and remove all the recognized ones */
static void parse_options( char *argv[] )
{
    const struct option_descr *opt;
    int i;

    for (i = 0; argv[i]; i++)
    {
        const char *equalarg = NULL;
        char *p = argv[i];
        if (*p++ != '-') continue;  /* not an option */
        if (*p && !p[1]) /* short name */
        {
            if (*p == '-') break; /* "--" option */
            for (opt = option_table; opt->longname; opt++) if (opt->shortname == *p) break;
        }
        else  /* long name */
        {
	    const char *equal = strchr  (p, '=');
            if (*p == '-') p++;
            /* check for the long name */
            for (opt = option_table; opt->longname; opt++) {
	        /* Plain --option */
                if (!strcmp( p, opt->longname )) break;

		/* --option=value */
		if (opt->has_arg &&
		    equal &&
		    strlen (opt->longname) == equal - p &&
		    !strncmp (p, opt->longname, equal - p)) {
		        equalarg = equal + 1;
		        break;
		    }
	    }
        }
        if (!opt->longname) continue;

	if (equalarg)
	{
            opt->func( equalarg );
            remove_options( argv, i, 1, opt->inherit );
	}
        else if (opt->has_arg && argv[i+1])
        {
            opt->func( argv[i+1] );
            remove_options( argv, i, 2, opt->inherit );
        }
        else
        {
            opt->func( "" );
            remove_options( argv, i, 1, opt->inherit );
        }
        i--;
    }
}

/* inherit options from WINEOPTIONS variable */
static void inherit_options( char *buffer )
{
    char *argv[256];
    unsigned int n;

    char *p = strtok( buffer, " \t" );
    for (n = 0; n < sizeof(argv)/sizeof(argv[0])-1 && p; n++)
    {
        argv[n] = p;
        p = strtok( NULL, " \t" );
    }
    argv[n] = NULL;
    parse_options( argv );
    if (argv[0])  /* an option remains */
    {
        MESSAGE( "Unknown option '%s' in WINEOPTIONS variable\n\n", argv[0] );
        OPTIONS_Usage();
    }
}

/***********************************************************************
 *              OPTIONS_Usage
 */
void OPTIONS_Usage(void)
{
    const struct option_descr *opt;
    MESSAGE( "%s\n\n", PACKAGE_STRING );
    MESSAGE( "Usage: %s [options] [--] program_name [arguments]\n", argv0 );
    MESSAGE("The -- has to be used if you specify arguments (of the program)\n\n");
    MESSAGE( "Options:\n" );
    for (opt = option_table; opt->longname; opt++) MESSAGE( "   %s\n", opt->usage );
    ExitProcess(0);
}

/***********************************************************************
 *              OPTIONS_ParseOptions
 */
void OPTIONS_ParseOptions( char *argv[] )
{
    char buffer[1024];
    int i;

    if (GetEnvironmentVariableA( "WINEOPTIONS", buffer, sizeof(buffer) ) && buffer[0])
        inherit_options( buffer );
    if (!argv) return;

    parse_options( argv + 1 );

    SetEnvironmentVariableA( "WINEOPTIONS", inherit_str );

    /* check if any option remains */
    for (i = 1; argv[i]; i++)
    {
        if (!strcmp( argv[i], "--" ))
        {
            remove_options( argv, i, 1, 0 );
            break;
        }
        if (argv[i][0] == '-')
        {
            MESSAGE( "Unknown option '%s'\n\n", argv[i] );
            OPTIONS_Usage();
        }
    }
}