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** This file is part of the QtCore module of the Qt Toolkit.
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** General Public License version 3 as published by the Free Software
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** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
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****************************************************************************/

#include "qlocale_p.h"

#include "qstringbuilder.h"
#include "qdatetime.h"
#include "qstringlist.h"
#include "qvariant.h"
#include "qreadwritelock.h"

QT_BEGIN_NAMESPACE

#ifndef QT_NO_SYSTEMLOCALE
struct QSystemLocaleData
{
    QSystemLocaleData()
        : lc_numeric(QLocale::C)
         ,lc_time(QLocale::C)
         ,lc_monetary(QLocale::C)
         ,lc_messages(QLocale::C)
    {
        readEnvironment();
    }

    void readEnvironment();

    QReadWriteLock lock;

    QLocale lc_numeric;
    QLocale lc_time;
    QLocale lc_monetary;
    QLocale lc_messages;
    QByteArray lc_messages_var;
    QByteArray lc_measurement_var;
    QStringList uiLanguages;
};

void QSystemLocaleData::readEnvironment()
{
    QWriteLocker locker(&lock);

    QByteArray all = qgetenv("LC_ALL");
    QByteArray numeric  = all.isEmpty() ? qgetenv("LC_NUMERIC") : all;
    QByteArray time     = all.isEmpty() ? qgetenv("LC_TIME") : all;
    QByteArray monetary = all.isEmpty() ? qgetenv("LC_MONETARY") : all;
    lc_messages_var     = all.isEmpty() ? qgetenv("LC_MESSAGES") : all;
    lc_measurement_var  = all.isEmpty() ? qgetenv("LC_MEASUREMENT") : all;
    QByteArray lang = qgetenv("LANG");
    if (lang.isEmpty())
        lang = QByteArray("C");
    if (numeric.isEmpty())
        numeric = lang;
    if (time.isEmpty())
        time = lang;
    if (monetary.isEmpty())
        monetary = lang;
    if (lc_messages_var.isEmpty())
        lc_messages_var = lang;
    if (lc_measurement_var.isEmpty())
        lc_measurement_var = lang;
    lc_numeric = QLocale(QString::fromLatin1(numeric));
    lc_time = QLocale(QString::fromLatin1(time));
    lc_monetary = QLocale(QString::fromLatin1(monetary));
    lc_messages = QLocale(QString::fromLatin1(lc_messages_var));
}

Q_GLOBAL_STATIC(QSystemLocaleData, qSystemLocaleData)

#endif

#ifndef QT_NO_SYSTEMLOCALE

QLocale QSystemLocale::fallbackUiLocale() const
{
    QByteArray lang = qgetenv("LC_ALL");
    if (lang.isEmpty())
        lang = qgetenv("LC_MESSAGES");
    if (lang.isEmpty())
        lang = qgetenv("LANG");
    // if the locale is the "C" locale, then we can return the language we found here:
    if (lang.isEmpty() || lang == QByteArray("C") || lang == QByteArray("POSIX"))
        return QLocale(QString::fromLatin1(lang));

    // if the locale is not the "C" locale and LANGUAGE is not empty, return
    // the first part of LANGUAGE if LANGUAGE is set and has a first part:
    QByteArray language = qgetenv("LANGUAGE");
    if (!language.isEmpty()) {
        language = language.split(':').constFirst();
        if (!language.isEmpty())
            return QLocale(QString::fromLatin1(language));
    }

    return QLocale(QString::fromLatin1(lang));
}

QVariant QSystemLocale::query(QueryType type, QVariant in) const
{
    QSystemLocaleData *d = qSystemLocaleData();

    if (type == LocaleChanged) {
        d->readEnvironment();
        return QVariant();
    }

    QReadLocker locker(&d->lock);

    const QLocale &lc_numeric = d->lc_numeric;
    const QLocale &lc_time = d->lc_time;
    const QLocale &lc_monetary = d->lc_monetary;
    const QLocale &lc_messages = d->lc_messages;

    switch (type) {
    case DecimalPoint:
        return lc_numeric.decimalPoint();
    case GroupSeparator:
        return lc_numeric.groupSeparator();
    case ZeroDigit:
        return lc_numeric.zeroDigit();
    case NegativeSign:
        return lc_numeric.negativeSign();
    case DateFormatLong:
        return lc_time.dateFormat(QLocale::LongFormat);
    case DateFormatShort:
        return lc_time.dateFormat(QLocale::ShortFormat);
    case TimeFormatLong:
        return lc_time.timeFormat(QLocale::LongFormat);
    case TimeFormatShort:
        return lc_time.timeFormat(QLocale::ShortFormat);
    case DayNameLong:
        return lc_time.dayName(in.toInt(), QLocale::LongFormat);
    case DayNameShort:
        return lc_time.dayName(in.toInt(), QLocale::ShortFormat);
    case MonthNameLong:
        return lc_time.monthName(in.toInt(), QLocale::LongFormat);
    case MonthNameShort:
        return lc_time.monthName(in.toInt(), QLocale::ShortFormat);
    case StandaloneMonthNameLong:
        return lc_time.standaloneMonthName(in.toInt(), QLocale::LongFormat);
    case StandaloneMonthNameShort:
        return lc_time.standaloneMonthName(in.toInt(), QLocale::ShortFormat);
    case DateToStringLong:
        return lc_time.toString(in.toDate(), QLocale::LongFormat);
    case DateToStringShort:
        return lc_time.toString(in.toDate(), QLocale::ShortFormat);
    case TimeToStringLong:
        return lc_time.toString(in.toTime(), QLocale::LongFormat);
    case TimeToStringShort:
        return lc_time.toString(in.toTime(), QLocale::ShortFormat);
    case DateTimeFormatLong:
        return lc_time.dateTimeFormat(QLocale::LongFormat);
    case DateTimeFormatShort:
        return lc_time.dateTimeFormat(QLocale::ShortFormat);
    case DateTimeToStringLong:
        return lc_time.toString(in.toDateTime(), QLocale::LongFormat);
    case DateTimeToStringShort:
        return lc_time.toString(in.toDateTime(), QLocale::ShortFormat);
    case PositiveSign:
        return lc_numeric.positiveSign();
    case AMText:
        return lc_time.amText();
    case PMText:
        return lc_time.pmText();
    case FirstDayOfWeek:
        return lc_time.firstDayOfWeek();
    case CurrencySymbol:
        return lc_monetary.currencySymbol(QLocale::CurrencySymbolFormat(in.toUInt()));
    case CurrencyToString: {
        switch (in.type()) {
        case QVariant::Int:
            return lc_monetary.toCurrencyString(in.toInt());
        case QVariant::UInt:
            return lc_monetary.toCurrencyString(in.toUInt());
        case QVariant::Double:
            return lc_monetary.toCurrencyString(in.toDouble());
        case QVariant::LongLong:
            return lc_monetary.toCurrencyString(in.toLongLong());
        case QVariant::ULongLong:
            return lc_monetary.toCurrencyString(in.toULongLong());
        default:
            break;
        }
        return QString();
    }
    case MeasurementSystem: {
        const QString meas_locale = QString::fromLatin1(d->lc_measurement_var.constData(), d->lc_measurement_var.size());
        if (meas_locale.compare(QLatin1String("Metric"), Qt::CaseInsensitive) == 0)
            return QLocale::MetricSystem;
        if (meas_locale.compare(QLatin1String("Other"), Qt::CaseInsensitive) == 0)
            return QLocale::MetricSystem;
        return QVariant((int)QLocale(meas_locale).measurementSystem());
    }
    case UILanguages: {
        if (!d->uiLanguages.isEmpty())
            return d->uiLanguages;
        QString languages = QString::fromLatin1(qgetenv("LANGUAGE"));
        QStringList lst;
        if (languages.isEmpty())
            lst.append(QString::fromLatin1(d->lc_messages_var));
        else
            lst = languages.split(QLatin1Char(':'));

        for (int i = 0; i < lst.size(); ++i) {
            const QString &name = lst.at(i);
            QString lang, script, cntry;
            if (qt_splitLocaleName(name, lang, script, cntry)) {
                if (!cntry.length())
                    d->uiLanguages.append(lang);
                else
                    d->uiLanguages.append(lang % QLatin1Char('-') % cntry);
            }
        }
        return d->uiLanguages.isEmpty() ? QVariant() : QVariant(d->uiLanguages);
    }
    case StringToStandardQuotation:
        return lc_messages.quoteString(in.value<QStringRef>());
    case StringToAlternateQuotation:
        return lc_messages.quoteString(in.value<QStringRef>(), QLocale::AlternateQuotation);
    case ListToSeparatedString:
        return lc_messages.createSeparatedList(in.toStringList());
    case LocaleChanged:
        Q_ASSERT(false);
    default:
        break;
    }
    return QVariant();
}
#endif // QT_NO_SYSTEMLOCALE

QT_END_NAMESPACE