/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

/*

 * This file is part of the LibreOffice project.

 *

 * This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this

 * file, You can obtain one at http://mozilla.org/MPL/2.0/.

 *

 * This file incorporates work covered by the following license notice:

 *

 *   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 .

 */

#include <sal/config.h>

#include <sal/log.hxx>

#include <cassert>

#include <limits>

#include "localebackend.hxx"

#include <com/sun/star/beans/Optional.hpp>

#include <com/sun/star/uno/XComponentContext.hpp>

#include <cppuhelper/supportsservice.hxx>

#include <rtl/character.hxx>

#include <o3tl/char16_t2wchar_t.hxx>

#include <i18nlangtag/languagetag.hxx>

#include <i18nlangtag/mslangid.hxx>

#ifdef _WIN32

#if !defined WIN32_LEAN_AND_MEAN

# define WIN32_LEAN_AND_MEAN

#endif

#include <windows.h>

static css::beans::Optional<css::uno::Any> ImplGetLocale(LCID lcid)

{

    WCHAR buffer[8];

    PWSTR cp = buffer;

    cp += GetLocaleInfoW( lcid, LOCALE_SISO639LANGNAME, buffer, 4 );

    if( cp > buffer )

    {

        if( 0 < GetLocaleInfoW( lcid, LOCALE_SISO3166CTRYNAME, cp, buffer + 8 - cp) )

            // #i50822# minus character must be written before cp

            *(cp - 1) = '-';

        return {true, css::uno::Any(OUString(o3tl::toU(buffer)))};

    }

    return {false, {}};

}

#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(OUStringBuffer& buffer, const CFStringRef s)

    {

        CFIndex lstr = CFStringGetLength(s);

        for (CFIndex i = 0; i < lstr; i++)

            buffer.append(sal_Unicode(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(nullptr, pref, kCFStringEncodingASCII);

        CFStringGuard csRefGuard(csPref);

        CFTypeRef ref = CFPreferencesCopyAppValue(csPref, kCFPreferencesCurrentApplication);

        CFTypeRefGuard refGuard(ref);

        if (ref == nullptr)

            return nullptr;

        CFStringRef sref = (CFGetTypeID(ref) == CFArrayGetTypeID()) ? static_cast<CFStringRef>(CFArrayGetValueAtIndex(static_cast<CFArrayRef>(ref), 0)) : static_cast<CFStringRef>(ref);

        // NOTE: this API is only available with macOS >=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 macOS versions. See also #i54337#

        return CFLocaleCreateCanonicalLocaleIdentifierFromString(kCFAllocatorDefault, sref);

    }

    css::beans::Optional<css::uno::Any> ImplGetLocale(const char* pref)

    {

        CFStringRef sref = ImplGetAppPreference(pref);

        CFStringGuard srefGuard(sref);

        OUStringBuffer aLocaleBuffer("en-US"); // initialize with fallback value

        if (sref != nullptr)

        {

            // split the string into substrings; the first two (if there are two) substrings

            // are language and country

            CFArrayRef subs = CFStringCreateArrayBySeparatingStrings(nullptr, sref, CFSTR("_"));

            CFArrayGuard subsGuard(subs);

            if (subs != nullptr)

            {

                aLocaleBuffer.setLength(0); // clear buffer which still contains fallback value

                CFStringRef lang = static_cast<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.append("-");

                    CFStringRef country = static_cast<CFStringRef>(CFArrayGetValueAtIndex(subs, 1));

                    OUStringBufferAppendCFString(aLocaleBuffer, country);

                }

            }

        }

        return {true, css::uno::Any(aLocaleBuffer.makeStringAndClear())};

    }

} // namespace /* private */

#else

#include <rtl/ustrbuf.hxx>

#include <cstdlib>

#include <cstring>

static css::beans::Optional<css::uno::Any> ImplGetLocale(char const * category)

{

    const char *locale = std::getenv("LC_ALL");

    if (locale == nullptr || *locale == '\0') {

        locale = std::getenv(category);

        if (locale == nullptr || *locale == '\0') {

            locale = std::getenv("LANG");

        }

    }

    // Return "en-US" for C locales

    if( (locale == nullptr) || *locale == '\0' || std::strcmp(locale, "C") == 0

        || std::strcmp(locale, "POSIX") == 0 )

        return {true, css::uno::Any(u"en-US"_ustr)};

    const char *cp;

    const char *uscore = nullptr;

    const char *end = nullptr;

    // locale string have the format lang[_ctry][.encoding][@modifier]

    // Let LanguageTag handle all conversion, but do a sanity and length check

    // first.

    // For the fallback we are only interested in the first two items, so we

    // handle '.' and '@' as string end for that.

    for (cp = locale; *cp; cp++)

    {

        if (*cp == '_' && !uscore)

            uscore = cp;

        if ((*cp == '.' || *cp == '@') && !end)

            end = cp;

        if (!rtl::isAscii(static_cast<unsigned char>(*cp))) {

            SAL_INFO("shell", "locale env var with non-ASCII content");

            return {false, {}};

        }

    }

    assert(cp >= locale);

    if (cp - locale > std::numeric_limits<sal_Int32>::max()) {

        SAL_INFO("shell", "locale env var content too long");

        return {false, {}};

    }

    // This is a tad awkward... but the easiest way to obtain what we're

    // actually interested in. For example this also converts

    // "ca_ES.UTF-8@valencia" to "ca-ES-valencia".

    const OString aLocaleStr(locale);

    const LanguageType nLang = MsLangId::convertUnxByteStringToLanguage( aLocaleStr);

    if (nLang != LANGUAGE_DONTKNOW)

    {

        const OUString aLangTagStr( LanguageTag::convertToBcp47( nLang));

        return {true, css::uno::Any(aLangTagStr)};

    }

    // As a fallback, strip encoding and modifier and return just a

    // language-country combination and let the caller handle unknowns.

    OUStringBuffer aLocaleBuffer;

    if (!end)

        end = cp;

    if( uscore != nullptr )

    {

        aLocaleBuffer.appendAscii(locale, uscore++ - locale);

        aLocaleBuffer.append("-");

        aLocaleBuffer.appendAscii(uscore, end - uscore);

    }

    else

    {

        aLocaleBuffer.appendAscii(locale, end - locale);

    }

    return {true, css::uno::Any(aLocaleBuffer.makeStringAndClear())};

}

#endif

LocaleBackend::LocaleBackend()

{

}

LocaleBackend::~LocaleBackend()

{

}

css::beans::Optional<css::uno::Any> LocaleBackend::getLocale()

{

#if defined(_WIN32)

    return ImplGetLocale( GetUserDefaultLCID() );

#elif defined (MACOSX)

    return ImplGetLocale("AppleLocale");

#else

    return ImplGetLocale("LC_CTYPE");

#endif

}

css::beans::Optional<css::uno::Any> LocaleBackend::getUILocale()

{

#if defined(_WIN32)

    return ImplGetLocale( MAKELCID(GetUserDefaultUILanguage(), SORT_DEFAULT) );

#elif defined(MACOSX)

    return ImplGetLocale("AppleLanguages");

#else

    return ImplGetLocale("LC_MESSAGES");

#endif

}

css::beans::Optional<css::uno::Any> LocaleBackend::getSystemLocale()

{

// note: the implementation differs from getLocale() only on Windows

#if defined(_WIN32)

    return ImplGetLocale( GetSystemDefaultLCID() );

#else

    return getLocale();

#endif

}

void LocaleBackend::setPropertyValue(

    OUString const &, css::uno::Any const &)

{

    throw css::lang::IllegalArgumentException(

        u"setPropertyValue not supported"_ustr,

        getXWeak(), -1);

}

css::uno::Any LocaleBackend::getPropertyValue(

    OUString const & PropertyName)

{

    if ( PropertyName == "Locale" ) {

        return css::uno::Any(getLocale());

    } else if (PropertyName == "SystemLocale")

    {

        return css::uno::Any(getSystemLocale());

    } else if (PropertyName == "UILocale")

    {

        return css::uno::Any(getUILocale());

    } else {

        throw css::beans::UnknownPropertyException(

            PropertyName, getXWeak());

    }

}

OUString SAL_CALL LocaleBackend::getImplementationName()

{

    return u"com.sun.star.comp.configuration.backend.LocaleBackend"_ustr ;

}

sal_Bool SAL_CALL LocaleBackend::supportsService(const OUString& aServiceName)

{

    return cppu::supportsService(this, aServiceName);

}

uno::Sequence<OUString> SAL_CALL LocaleBackend::getSupportedServiceNames()

{

    return { u"com.sun.star.configuration.backend.LocaleBackend"_ustr };

}

extern "C" SAL_DLLPUBLIC_EXPORT css::uno::XInterface*

shell_LocaleBackend_get_implementation(

    css::uno::XComponentContext* , css::uno::Sequence<css::uno::Any> const&)

{

    return cppu::acquire(new LocaleBackend());

}

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