/****************************************************************************
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** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
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** This file is part of the QtCore module of the Qt Toolkit.
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** ensure the GNU Lesser General Public License version 2.1 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
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****************************************************************************/

#include "qplatformdefs.h"
#include "qurl.h"
#include "private/qurltlds_p.h"
#include "private/qtldurl_p.h"
#include "QtCore/qstringlist.h"
#include "QtCore/qhash.h"

QT_BEGIN_NAMESPACE

static bool containsTLDEntry(const QString &entry)
{
    int index = qt_hash(entry) % tldCount;
    int currentDomainIndex = tldIndices[index];
    while (currentDomainIndex < tldIndices[index+1]) {
        QString currentEntry = QString::fromUtf8(tldData + currentDomainIndex);
        if (currentEntry == entry)
            return true;
        currentDomainIndex += qstrlen(tldData + currentDomainIndex) + 1; // +1 for the ending \0
    }
    return false;
}

/*!
    \internal

    Return the top-level-domain per Qt's copy of the Mozilla public suffix list of
    \a domain.
*/

Q_CORE_EXPORT QString qTopLevelDomain(const QString &domain)
{
    QStringList sections = domain.toLower().split(QLatin1Char('.'), QString::SkipEmptyParts);
    if (sections.isEmpty())
        return QString();

    QString level, tld;
    for (int j = sections.count() - 1; j >= 0; --j) {
        level.prepend(QLatin1Char('.') + sections.at(j));
        if (qIsEffectiveTLD(level.right(level.size() - 1)))
            tld = level;
    }
    return tld;
}

/*!
    \internal

    Return true if \a domain is a top-level-domain per Qt's copy of the Mozilla public suffix list.
*/

Q_CORE_EXPORT bool qIsEffectiveTLD(const QString &domain)
{
    // for domain 'foo.bar.com':
    // 1. return if TLD table contains 'foo.bar.com'
    if (containsTLDEntry(domain))
        return true;

    if (domain.contains(QLatin1Char('.'))) {
        int count = domain.size() - domain.indexOf(QLatin1Char('.'));
        QString wildCardDomain;
        wildCardDomain.reserve(count + 1);
        wildCardDomain.append(QLatin1Char('*'));
        wildCardDomain.append(domain.right(count));
        // 2. if table contains '*.bar.com',
        // test if table contains '!foo.bar.com'
        if (containsTLDEntry(wildCardDomain)) {
            QString exceptionDomain;
            exceptionDomain.reserve(domain.size() + 1);
            exceptionDomain.append(QLatin1Char('!'));
            exceptionDomain.append(domain);
            return (! containsTLDEntry(exceptionDomain));
        }
    }
    return false;
}

QT_END_NAMESPACE