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#include "qversitdocumentwriter_p.h"

#include "versitutils_p.h"

#include <QTextCodec>

QTM_USE_NAMESPACE

#define MAX_LINE_LENGTH 76

/*!

  \class QVersitDocumentWriter

  \internal

  \brief The QVersitDocumentWriter class provides an interface for writing a

  single versit document into a vCard text string.

 */

/*! Constructs a writer.

 * \a documentType is the type of Versit document, as printed on the BEGIN line of output

 * eg. "VCARD"

 * \a version is the version of the Versit format, as printed on the VERSION line of output.

 * eg. "2.1"

 */

QVersitDocumentWriter::QVersitDocumentWriter(

    const QByteArray& documentType,

    const QByteArray& version)

    : mDocumentType(documentType),

    mVersion(version),

    mCodec(0),

    mEncoder(0),

    mUtf8Encoder(QTextCodec::codecForName("UTF-8")->makeEncoder()),

    mSuccessful(true),

    mCurrentLineLength(0)

{

    // Hack so the encoder doesn't output a byte order mark for UTF-8.

    mUtf8Encoder->fromUnicode(QString());

}

QVersitDocumentWriter::~QVersitDocumentWriter()

{

    if (mEncoder)

        delete mEncoder;

    delete mUtf8Encoder;

}

/*!

  Sets the codec to write with.

  */

void QVersitDocumentWriter::setCodec(QTextCodec *codec)

{

    if (mEncoder)

        delete mEncoder;

    mCodec = codec;

    mEncoder = codec->makeEncoder();

    // Hack so the encoder doesn't output a byte order mark for UTF-8.

    if (mCodec->name() == "UTF-8")

        mEncoder->fromUnicode(QString());

}

/*!

  Sets the device to write to.

  */

void QVersitDocumentWriter::setDevice(QIODevice *device)

{

    mDevice = device;

}

/*!

* Encodes the \a document and writes it to the device

*/

void QVersitDocumentWriter::encodeVersitDocument(const QVersitDocument& document)

{

    mSuccessful = true;

    QList<QVersitProperty> properties = document.properties();

    writeString(QLatin1String("BEGIN:" + mDocumentType));

    writeCrlf();

    writeString(QLatin1String("VERSION:" + mVersion));

    writeCrlf();

    foreach (const QVersitProperty& property, properties) {

        encodeVersitProperty(property);

    }

    writeString(QLatin1String("END:" + mDocumentType));

    writeCrlf();

}

/*!

 * Encodes the groups and name in the \a property and writes it to the device

 */

void QVersitDocumentWriter::encodeGroupsAndName(const QVersitProperty& property)

{

    QStringList groups = property.groups();

    if (!groups.isEmpty()) {

        writeString(groups.join(QLatin1String(".")));

        writeString(QLatin1String("."));

    }

    writeString(property.name());

}

/*!

  Writes \a string to the device.

  If \a useUtf8 is true, uses the UTF-8 codec instead of the one set in setCodec().

  This function tracks how many characters have been written to the line and folds (wraps) the line

  according to RFC2425.

  */

void QVersitDocumentWriter::writeString(const QString &string, bool useUtf8)

{

    QString value(string); // nonconst copy

    QTextEncoder* encoder = useUtf8 ? mUtf8Encoder : mEncoder;

    int spaceRemaining = MAX_LINE_LENGTH - mCurrentLineLength;

    while (spaceRemaining < value.length()) {

        // Write the first "spaceRemaining" characters

        QString line(value.left(spaceRemaining));

        value.remove(0, spaceRemaining);

        if (mDevice->write(encoder->fromUnicode(line + QLatin1String("\r\n "))) < 0)

            mSuccessful = false;

        spaceRemaining = MAX_LINE_LENGTH - 1; // minus 1 for the space at the front.

        mCurrentLineLength = 1;

    }

    if (mDevice->write(encoder->fromUnicode(value)) < 0)

        mSuccessful = false;

    mCurrentLineLength += value.length();

}

/*!

  Writes a CRLF to the device.  By using this function, rather than writeString("\\r\\n"), you will

  allow the writer to know where a line starts, for folding purposes.

  */

void QVersitDocumentWriter::writeCrlf()

{

    writeString(QLatin1String("\r\n"));

    mCurrentLineLength = 0;

}