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#include "versitutils_p.h"
#include "qversitdocument.h"
#include "qversitproperty.h"
#include "qmobilityglobal.h"

#include <QMap>
#include <QTextCodec>
#include <QScopedPointer>

QTM_USE_NAMESPACE

QTextCodec* VersitUtils::m_previousCodec = 0;
QList<QByteArrayMatcher>* VersitUtils::m_newlineList = 0;
QByteArray VersitUtils::m_encodingMap[256];

/*!
 * Encode \a ch with \a codec, without adding an byte-order mark
 */
QByteArray VersitUtils::encode(char ch, QTextCodec* codec)
{
    if (codec != m_previousCodec) {
        changeCodec(codec);
    }
    return m_encodingMap[(int)ch];
}

/*!
 * Encode \a ba with \a codec, without adding an byte-order mark.  \a ba is interpreted as ASCII
 */
QByteArray VersitUtils::encode(const QByteArray& ba, QTextCodec* codec)
{
    QTextCodec::ConverterState state(QTextCodec::IgnoreHeader);
    return codec->fromUnicode(QString::fromAscii(ba.data()).data(), ba.length(), &state);
}

/*!
 * Returns the list of DOS, UNIX and Mac newline characters for \a codec.
 */
QList<QByteArrayMatcher>* VersitUtils::newlineList(QTextCodec* codec)
{
    if (m_newlineList != 0 && codec == m_previousCodec) {
        return m_newlineList;
    }
    changeCodec(codec);
    return m_newlineList;
}

/*!
 * Update the cached tables of pregenerated encoded text with \a codec.
 */
void VersitUtils::changeCodec(QTextCodec* codec) {
    // Build m_encodingMap
    QChar qch;
    QTextCodec::ConverterState state(QTextCodec::IgnoreHeader);
    for (int c = 0; c < 256; c++) {
        qch = QLatin1Char(c);
        m_encodingMap[c] = codec->fromUnicode(&qch, 1, &state);
    }

    // Build m_newlineList
    if (m_newlineList != 0)
        delete m_newlineList;
    m_newlineList = new QList<QByteArrayMatcher>;
    m_newlineList->append(QByteArrayMatcher(encode("\r\n", codec)));
    m_newlineList->append(QByteArrayMatcher(encode("\n", codec)));
    m_newlineList->append(QByteArrayMatcher(encode("\r", codec)));

    m_previousCodec = codec;
}

/*!
 * Finds a property in the \a document with the given \a propertyName, adds it to \a toBeRemoved,
 * and returns it.
 */
QVersitProperty VersitUtils::takeProperty(const QVersitDocument& document,
                                          const QString& propertyName,
                                          QList<QVersitProperty>* toBeRemoved) {
    foreach (const QVersitProperty& currentProperty, document.properties()) {
        if (currentProperty.name() == propertyName) {
            *toBeRemoved << currentProperty;
            return currentProperty;
        }
    }
    return QVersitProperty();
}