/**************************************************************
 * 
 * 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.
 * 
 *************************************************************/




// no include "precompiled_i18nisolang.hxx" because this file is included in insys.cxx

#include <stdlib.h>  // for getenv()
#include <stdio.h>

#ifdef MACOSX
#include <osl/process.h>
#include <rtl/locale.h>
#include <rtl/ustring.hxx>

#else   // MACOSX
#include <rtl/string.hxx>

#endif  // MACOSX
#include <rtl/instance.hxx>
#include "i18npool/mslangid.hxx"

// =======================================================================

static LanguageType nImplSystemLanguage = LANGUAGE_DONTKNOW;
static LanguageType nImplSystemUILanguage = LANGUAGE_DONTKNOW;

// -----------------------------------------------------------------------

// Get locale of category LC_CTYPE of environment variables
static const sal_Char* getLangFromEnvironment()
{
    static const sal_Char* pFallback = "C";
    const sal_Char *pLang = NULL;

    pLang = getenv ( "LC_ALL" );
    if (! pLang || pLang[0] == 0)
        pLang = getenv ( "LC_CTYPE" );
    if (! pLang || pLang[0] == 0)
        pLang = getenv( "LANG" );
    if (! pLang || pLang[0] == 0)
        pLang = pFallback;

    return pLang;
}

// -----------------------------------------------------------------------

// Get locale of category LC_MESSAGES of environment variables
static const sal_Char* getUILangFromEnvironment()
{
    static const sal_Char* pFallback = "C";
    const sal_Char *pLang = NULL;

    pLang = getenv ( "LANGUAGE" );      // respect the GNU extension
    if (! pLang || pLang[0] == 0)
        pLang = getenv ( "LC_ALL" );
    if (! pLang || pLang[0] == 0)
        pLang = getenv ( "LC_MESSAGES" );
    if (! pLang || pLang[0] == 0)
        pLang = getenv( "LANG" );
    if (! pLang || pLang[0] == 0)
        pLang = pFallback;

    return pLang;
}

// -----------------------------------------------------------------------

typedef const sal_Char * (*getLangFromEnv)();

static void getPlatformSystemLanguageImpl( LanguageType& rSystemLanguage,
        getLangFromEnv pGetLangFromEnv )
{
    /* get the language from the user environment */
    LanguageType nLang = rSystemLanguage;
    if ( nLang == LANGUAGE_DONTKNOW )
    {
        ::osl::MutexGuard aGuard( ::osl::Mutex::getGlobalMutex());
        nLang = rSystemLanguage;
        if ( nLang == LANGUAGE_DONTKNOW )
        {
#ifdef MACOSX
            rtl_Locale    *procLocale;
            (void) pGetLangFromEnv; /* unused */

            if ( osl_getProcessLocale(&procLocale) == osl_Process_E_None )
            {
                rtl::OUString     rLang( procLocale->Language );
                rtl::OUString     rCountry( procLocale->Country );

                nLang = MsLangId::convertIsoNamesToLanguage( rLang, rCountry );
                OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();
                rSystemLanguage = nLang;
#ifdef DEBUG
                if ( rSystemLanguage == LANGUAGE_DONTKNOW )
                    fprintf( stderr, "intnunx.cxx:  failed to convert osl_getProcessLocale() language to system language.\n" );
#endif
            }
#else   /* MACOSX */
            rtl::OString aUnxLang( (pGetLangFromEnv)() );
            nLang = MsLangId::convertUnxByteStringToLanguage( aUnxLang );
            OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();
            rSystemLanguage = nLang;
#endif  /* MACOSX */
        }
        else {
            OSL_DOUBLE_CHECKED_LOCKING_MEMORY_BARRIER();
        }
    }
}

// -----------------------------------------------------------------------

LanguageType MsLangId::getPlatformSystemLanguage()
{
    getPlatformSystemLanguageImpl( nImplSystemLanguage, &getLangFromEnvironment);
    return nImplSystemLanguage;
}

// -----------------------------------------------------------------------

LanguageType MsLangId::getPlatformSystemUILanguage()
{
    getPlatformSystemLanguageImpl( nImplSystemUILanguage, &getUILangFromEnvironment);
    return nImplSystemUILanguage;
}