/**************************************************************
 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 *************************************************************/


#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "osl/thread.h"
#include "osl/file.h"
#include "rtl/ustring.hxx"
#include  "rtl/ustrbuf.h"


using namespace rtl;

static sal_Bool hasOption(char const * szOption, int argc, char** argv);


#define HELP_TEXT    \
"SYNOPSIS \n\n" \
"\tsp2bv [-h] [-?] string \n\n" \
"DESCRIPTION\n\n" \
"\tsp2bv stands for \"system path to bootstrap variable\"." \
" First the system path is converted into a file URL. Then all " \
"characters which have a special meaning in bootstrap variables, " \
"such as \'$\' are escaped. The resulting string is written to " \
"stdout an can be assigned to a bootstrap variable.\n" \
"\n\n" \
"OPTIONS \n\n" \
"\tThe following options are supported: \n" \
"-?\n " \
"--help" \
"    Display help information.\n"


int main(int argc, char **argv)
{
    if( hasOption("--help",argc, argv) || hasOption("-h", argc, argv))
    {
        fprintf(stdout, HELP_TEXT);// default
        return 0;
    }

    if (argc != 2)
	{
        fprintf(stdout, HELP_TEXT);
		return -1;
	}

    rtl_uString* pPath = NULL;
    rtl_string2UString( &pPath, argv[1], strlen(argv[1]),
                        osl_getThreadTextEncoding(),OSTRING_TO_OUSTRING_CVTFLAGS );

    rtl_uString* pUrl = NULL;
    if (osl_getFileURLFromSystemPath(pPath, &pUrl) != osl_File_E_None)
        return -1;
//escape the special characters

    sal_Unicode cEscapeChar = 0x5c;
    rtl_uString* pBuffer = NULL;
    sal_Int32 nCapacity = 255;
    rtl_uString_new_WithLength( &pBuffer, nCapacity );

    const sal_Unicode* pCur = pUrl->buffer;
    for (int i = 0; i != pUrl->length; i++)
    {
        switch( *pCur)
        {
        case '$':
            rtl_uStringbuffer_insert( &pBuffer, &nCapacity, pBuffer->length, &cEscapeChar, 1);
            rtl_uStringbuffer_insert( &pBuffer, &nCapacity, pBuffer->length, pCur, 1);
            break;
        case '{':
        case '}':
        case '\\': fprintf(stderr, "sp2vb: file URL contains invalid characters!\n");
            return -1;
        default:
            rtl_uStringbuffer_insert( &pBuffer, &nCapacity, pBuffer->length, pCur, 1);
        }
		pCur ++;
    }
//convert back to byte string so that we can print it.
    rtl_String* pBootVar = NULL;
    rtl_uString2String( &pBootVar, pBuffer->buffer, pBuffer->length,
                        osl_getThreadTextEncoding(), OUSTRING_TO_OSTRING_CVTFLAGS);

    fprintf(stdout, "%s", pBootVar->buffer);
    fflush(stdout);

    rtl_uString_release(pBuffer);
    rtl_uString_release(pPath);
    rtl_uString_release(pUrl);
    rtl_string_release(pBootVar);
    return 0;
}


static sal_Bool hasOption(char const * szOption, int argc, char** argv)
{
    sal_Bool retVal= sal_False;
    for(sal_Int16 i= 1; i < argc; i++)
    {
        if( ! strcmp(argv[i], szOption))
        {
            retVal= sal_True;
            break;
        }
    }
    return retVal;
}