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


// MARKER(update_precomp.py): autogen include statement, do not remove
#include "precompiled_shell.hxx"

#include "localebackend.hxx"
#include <com/sun/star/beans/Optional.hpp>
#include <osl/time.h>

#include <stdio.h>

#if defined(LINUX) || defined(SOLARIS) || defined(NETBSD) || defined(FREEBSD) || defined(OS2)

#include <rtl/ustrbuf.hxx>
#include <locale.h>
#include <string.h>

/*
 * Note: setlocale is not at all thread safe, so is this code. It could
 * especially interfere with the stuff VCL is doing, so make sure this
 * is called from the main thread only.
 */

static rtl::OUString ImplGetLocale(int category)
{
    const char *locale = setlocale(category, "");

    // Return "en-US" for C locales
    if( (locale == NULL) || ( locale[0] == 'C' && locale[1] == '\0' ) )
        return rtl::OUString( RTL_CONSTASCII_USTRINGPARAM( "en-US" ) );


    const char *cp;
    const char *uscore = NULL;

    // locale string have the format lang[_ctry][.encoding][@modifier]
    // we are only interested in the first two items, so we handle
    // '.' and '@' as string end.
    for (cp = locale; *cp; cp++)
    {
        if (*cp == '_')
            uscore = cp;
        if (*cp == '.' || *cp == '@')
            break;
    }

    rtl::OUStringBuffer aLocaleBuffer;
    if( uscore != NULL )
    {
        aLocaleBuffer.appendAscii(locale, uscore++ - locale);
        aLocaleBuffer.appendAscii("-");
        aLocaleBuffer.appendAscii(uscore, cp - uscore);
    }
    else
    {
        aLocaleBuffer.appendAscii(locale, cp - locale);
    }

    return aLocaleBuffer.makeStringAndClear();
}

#elif defined(MACOSX) 

#include <rtl/ustrbuf.hxx>
#include <locale.h>
#include <string.h>

#include <premac.h>
#include <CoreServices/CoreServices.h>
#include <CoreFoundation/CoreFoundation.h>
#include <postmac.h>

namespace /* private */
{

	void OUStringBufferAppendCFString(rtl::OUStringBuffer& buffer, const CFStringRef s)
	{
		CFIndex lstr = CFStringGetLength(s);	
		for (CFIndex i = 0; i < lstr; i++)
			buffer.append(CFStringGetCharacterAtIndex(s, i));
	}

	template <typename T>
	class CFGuard
	{
	public:
		explicit CFGuard(T& rT) : rT_(rT) {}
		~CFGuard() { if (rT_) CFRelease(rT_); }
	private:
		T& rT_;
	};

	typedef CFGuard<CFArrayRef> CFArrayGuard;
	typedef CFGuard<CFStringRef> CFStringGuard;
	typedef CFGuard<CFTypeRef> CFTypeRefGuard;

	/* For more information on the Apple locale concept please refer to 
	http://developer.apple.com/documentation/CoreFoundation/Conceptual/CFLocales/Articles/CFLocaleConcepts.html
	According to this documentation a locale identifier has the format: language[_country][_variant]*
	e.g. es_ES_PREEURO -> spain prior Euro support
	Note: The calling code should be able to handle locales with only language information e.g. 'en' for certain
	UI languages just the language code will be returned.
	*/

	CFStringRef ImplGetAppPreference(const char* pref)
	{
		CFStringRef csPref = CFStringCreateWithCString(NULL, pref, kCFStringEncodingASCII);
		CFStringGuard csRefGuard(csPref);
		
		CFTypeRef ref = CFPreferencesCopyAppValue(csPref, kCFPreferencesCurrentApplication);
		CFTypeRefGuard refGuard(ref);
	
		if (ref == NULL)
			return NULL;
		
		CFStringRef sref = (CFGetTypeID(ref) == CFArrayGetTypeID()) ? (CFStringRef)CFArrayGetValueAtIndex((CFArrayRef)ref, 0) : (CFStringRef)ref;
		
		// NOTE: this API is only available with Mac OS X >=10.3. We need to use it because
		// Apple used non-ISO values on systems <10.2 like "German" for instance but didn't
		// upgrade those values during upgrade to newer Mac OS X versions. See also #i54337#
		return CFLocaleCreateCanonicalLocaleIdentifierFromString(kCFAllocatorDefault, sref);			
	}

	rtl::OUString ImplGetLocale(const char* pref)
	{
		CFStringRef sref = ImplGetAppPreference(pref);
		CFStringGuard srefGuard(sref);
		
		rtl::OUStringBuffer aLocaleBuffer;
		aLocaleBuffer.appendAscii("en-US"); // initialize with fallback value
		
		if (sref != NULL)
		{
			// split the string into substrings; the first two (if there are two) substrings 
			// are language and country
			CFArrayRef subs = CFStringCreateArrayBySeparatingStrings(NULL, sref, CFSTR("_"));
			CFArrayGuard subsGuard(subs);
				
			if (subs != NULL)
			{
				aLocaleBuffer.setLength(0); // clear buffer which still contains fallback value
				
				CFStringRef lang = (CFStringRef)CFArrayGetValueAtIndex(subs, 0);
				OUStringBufferAppendCFString(aLocaleBuffer, lang);
				
				// country also available? Assumption: if the array contains more than one
				// value the second value is always the country!
				if (CFArrayGetCount(subs) > 1) 
				{	
					aLocaleBuffer.appendAscii("-");
					CFStringRef country = (CFStringRef)CFArrayGetValueAtIndex(subs, 1);
					OUStringBufferAppendCFString(aLocaleBuffer, country);
				}					
			}
		}
		return aLocaleBuffer.makeStringAndClear();
	}

} // namespace /* private */

#endif

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

#ifdef WNT

#ifdef WINVER
#undef WINVER
#endif
#define WINVER 0x0501

#if defined _MSC_VER
#pragma warning(push, 1)
#endif
#include <windows.h>
#if defined _MSC_VER
#pragma warning(pop)
#endif 

rtl::OUString ImplGetLocale(LCID lcid)
{
    TCHAR buffer[8];
    LPTSTR cp = buffer;

    cp += GetLocaleInfo( lcid, LOCALE_SISO639LANGNAME , buffer, 4 );
    if( cp > buffer )
    {
        if( 0 < GetLocaleInfo( lcid, LOCALE_SISO3166CTRYNAME, cp, buffer + 8 - cp) )
            // #i50822# minus character must be written before cp
            *(cp - 1) = '-';

        return rtl::OUString::createFromAscii(buffer);
    }

    return rtl::OUString();
}

#endif // WNT

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

LocaleBackend::LocaleBackend()
{
}

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

LocaleBackend::~LocaleBackend(void)
{
}

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

LocaleBackend* LocaleBackend::createInstance()
{
    return new LocaleBackend;
}

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

rtl::OUString LocaleBackend::getLocale(void)
{
#if defined(LINUX) || defined(SOLARIS) || defined(NETBSD) || defined(FREEBSD) || defined(OS2)
    return ImplGetLocale(LC_CTYPE);
#elif defined (MACOSX)
	return ImplGetLocale("AppleLocale");
#elif defined WNT
    return ImplGetLocale( GetUserDefaultLCID() );
#endif
}

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

rtl::OUString LocaleBackend::getUILocale(void)
{
#if defined(LINUX) || defined(SOLARIS) || defined(NETBSD) || defined(FREEBSD) || defined(OS2)
    return ImplGetLocale(LC_MESSAGES);
#elif defined(MACOSX)
	return ImplGetLocale("AppleLanguages");
#elif defined WNT
    return ImplGetLocale( MAKELCID(GetUserDefaultUILanguage(), SORT_DEFAULT) );
#endif
}

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

rtl::OUString LocaleBackend::getSystemLocale(void)
{
// note: the implementation differs from getLocale() only on Windows
#if defined WNT
    return ImplGetLocale( GetSystemDefaultLCID() );
#else
    return getLocale();
#endif
}
//------------------------------------------------------------------------------

void LocaleBackend::setPropertyValue(
    rtl::OUString const &, css::uno::Any const &)
    throw (
        css::beans::UnknownPropertyException, css::beans::PropertyVetoException,
        css::lang::IllegalArgumentException, css::lang::WrappedTargetException,
        css::uno::RuntimeException)
{
    throw css::lang::IllegalArgumentException(
        rtl::OUString(
            RTL_CONSTASCII_USTRINGPARAM("setPropertyValue not supported")),
        static_cast< cppu::OWeakObject * >(this), -1);
}

css::uno::Any LocaleBackend::getPropertyValue(
    rtl::OUString const & PropertyName)
    throw (
        css::beans::UnknownPropertyException, css::lang::WrappedTargetException,
        css::uno::RuntimeException)
{
    if (PropertyName.equalsAsciiL(RTL_CONSTASCII_STRINGPARAM("Locale"))) {
        return css::uno::makeAny(
            css::beans::Optional< css::uno::Any >(
                true, css::uno::makeAny(getLocale())));
    } else if (PropertyName.equalsAsciiL(
                   RTL_CONSTASCII_STRINGPARAM("SystemLocale")))
    {
        return css::uno::makeAny(
            css::beans::Optional< css::uno::Any >(
                true, css::uno::makeAny(getSystemLocale())));
    } else if (PropertyName.equalsAsciiL(
                   RTL_CONSTASCII_STRINGPARAM("UILocale")))
    {
        return css::uno::makeAny(
            css::beans::Optional< css::uno::Any >(
                true, css::uno::makeAny(getUILocale())));
    } else {
        throw css::beans::UnknownPropertyException(
            PropertyName, static_cast< cppu::OWeakObject * >(this));
    }
}

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

rtl::OUString SAL_CALL LocaleBackend::getBackendName(void) {
	return rtl::OUString::createFromAscii("com.sun.star.comp.configuration.backend.LocaleBackend") ;
}

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

rtl::OUString SAL_CALL LocaleBackend::getImplementationName(void) 
    throw (uno::RuntimeException) 
{
    return getBackendName() ;
}

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

uno::Sequence<rtl::OUString> SAL_CALL LocaleBackend::getBackendServiceNames(void) 
{
    uno::Sequence<rtl::OUString> aServiceNameList(1);
    aServiceNameList[0] = rtl::OUString( RTL_CONSTASCII_USTRINGPARAM("com.sun.star.configuration.backend.LocaleBackend")) ;
    return aServiceNameList ;
}

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

sal_Bool SAL_CALL LocaleBackend::supportsService(const rtl::OUString& aServiceName) 
    throw (uno::RuntimeException) 
{
    uno::Sequence< rtl::OUString > const svc = getBackendServiceNames();

    for(sal_Int32 i = 0; i < svc.getLength(); ++i )
        if(svc[i] == aServiceName)
            return true;
            
    return false;
}

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

uno::Sequence<rtl::OUString> SAL_CALL LocaleBackend::getSupportedServiceNames(void) 
    throw (uno::RuntimeException) 
{
    return getBackendServiceNames() ;
}