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#include <QtCore/QRegExp>

#include <QtCore/QMutexLocker>

#include <QtGui/QTextDocument>

#include "qhelp_global.h"

QString QHelpGlobal::uniquifyConnectionName(const QString &name, void *pointer)

{

    static int counter = 0;

    static QMutex mutex;

    QMutexLocker locker(&mutex);

    if (++counter > 1000)

        counter = 0;

    return QString::fromLatin1("%1-%2-%3").

        arg(name).arg(long(pointer)).arg(counter);

}

QString QHelpGlobal::documentTitle(const QString &content)

{

    QString title = QObject::tr("Untitled");

    if (!content.isEmpty()) {

        int start = content.indexOf(QLatin1String("<title>"), 0, Qt::CaseInsensitive) + 7;

        int end = content.indexOf(QLatin1String("</title>"), 0, Qt::CaseInsensitive);

        if ((end - start) > 0) {

            title = content.mid(start, end - start);

            if (Qt::mightBeRichText(title) || title.contains(QLatin1Char('&'))) {

                QTextDocument doc;

                doc.setHtml(title);

                title = doc.toPlainText();

            }

        }

    }

    return title;

}

QString QHelpGlobal::codecFromData(const QByteArray &data)

{

    QString codec = codecFromXmlData(data);

    if (codec.isEmpty())

        codec = codecFromHtmlData(data);

    return codec.isEmpty() ? QLatin1String("utf-8") : codec;

}

QString QHelpGlobal::codecFromHtmlData(const QByteArray &data)

{

    QString content = QString::fromUtf8(data.constData(), data.size());

    int start = content.indexOf(QLatin1String("<meta"), 0, Qt::CaseInsensitive);

    if (start > 0) {

        int end;

        QRegExp r(QLatin1String("charset=([^\"\\s]+)"));

        while (start != -1) {

            end = content.indexOf(QLatin1Char('>'), start) + 1;

            const QString &meta = content.mid(start, end - start).toLower();

            if (r.indexIn(meta) != -1)

                return r.cap(1);

            start = content.indexOf(QLatin1String("<meta"), end,

                                    Qt::CaseInsensitive);

        }

    }

    return QString();

}

QString QHelpGlobal::codecFromXmlData(const QByteArray &data)

{

    QString content = QString::fromUtf8(data.constData(), data.size());

    const QRegExp encodingExp(QLatin1String("^\\s*<\\?xml version="

        "\"\\d\\.\\d\" encoding=\"([^\"]+)\"\\?>.*"));

    return encodingExp.exactMatch(content) ? encodingExp.cap(1) : QString();

}