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#include "qversitreader.h"
#include "qversitreader_p.h"
#include "versitutils_p.h"
#include "qmobilityglobal.h"

#include <QTextCodec>
#include <QMutexLocker>

QTM_USE_NAMESPACE

/*!
  \class QVersitReader
  \preliminary
  \brief The QVersitReader class reads Versit documents such as vCards from a device.
  \ingroup versit
 
  QVersitReader concatenation of Versit documents such as vCards
  from a text stream and returns a list of QVersitDocument instances.
  QVersitReader supports reading from an abstract I/O device
  which can be for example a file or a memory buffer.
  The reading can be done asynchronously, and the
  waitForFinished() function can be used to make a blocking
  read.
 
  \sa QVersitDocument
 */

/*!
 * \enum QVersitReader::Error
 * This enum specifies an error that occurred during the most recent operation:
 * \value NoError The most recent operation was successful
 * \value UnspecifiedError The most recent operation failed for an undocumented reason
 * \value IOError The most recent operation failed because of a problem with the device
 * \value OutOfMemoryError The most recent operation failed due to running out of memory
 * \value NotReadyError The most recent operation failed because there is an operation in progress
 * \value ParseError The most recent operation failed because the input was malformed
 */

/*!
 * \enum QVersitReader::State
 * Enumerates the various states that a reader may be in at any given time
 * \value InactiveState Read operation not yet started
 * \value ActiveState Read operation started, not yet finished
 * \value CanceledState Read operation is finished due to cancellation
 * \value FinishedState Read operation successfully completed
 */

/*!
 * \fn QVersitReader::stateChanged(QVersitReader::State state)
 * The signal is emitted by the reader when its state has changed (eg. when it has finished
 * reading from the device).
 * \a state is the new state of the reader.
 */

/*!
 * \fn QVersitReader::resultsAvailable(QList<QVersitDocument>& results)
 * \deprecated
 * The signal is emitted by the reader as it reads from the device when it has made more Versit
 * documents available.
 * \a results is the complete list of documents read so far.
 */

/*!
 * \fn QVersitReader::resultsAvailable()
 * The signal is emitted by the reader as it reads from the device when it has made more Versit
 * documents available.
 */

/*! Constructs a new reader. */
QVersitReader::QVersitReader() : d(new QVersitReaderPrivate)
{
    connect(d, SIGNAL(stateChanged(QVersitReader::State)),
            this, SIGNAL(stateChanged(QVersitReader::State)),Qt::DirectConnection);
    connect(d, SIGNAL(resultsAvailable(QList<QVersitDocument>&)),
            this, SIGNAL(resultsAvailable(QList<QVersitDocument>&)), Qt::DirectConnection);
    connect(d, SIGNAL(resultsAvailable(QList<QVersitDocument>&)),
            this, SIGNAL(resultsAvailable()), Qt::DirectConnection);
}
    
/*! 
 * Frees the memory used by the reader. 
 * Waits until a pending asynchronous reading has been completed.
 */
QVersitReader::~QVersitReader()
{
    d->wait();
    delete d;
}

/*!
 * Sets the device used for reading the input to be the given \a device.
 */
void QVersitReader::setDevice(QIODevice* device)
{
    d->mIoDevice = device;
}

/*!
 * Returns the device used for reading input.
 */
QIODevice* QVersitReader::device() const
{
    return d->mIoDevice;
}

/*!
 * Sets \a codec as the codec for the reader to use when parsing the input stream to.
 * This codec is not used for values where the CHARSET Versit parameter occurs.
 */
void QVersitReader::setDefaultCodec(QTextCodec *codec)
{
    if (codec != NULL) {
        d->mDefaultCodec = codec;
    } else {
        d->mDefaultCodec = QTextCodec::codecForName("UTF-8");
    }
}

/*!
 * Returns the codec the reader uses when parsing the input stream.
 */
QTextCodec* QVersitReader::defaultCodec() const
{
    return d->mDefaultCodec;
}

/*!
 * Starts reading the input asynchronously.
 * Returns false if the input device has not been set or opened or
 * if there is another asynchronous read operation already pending.
 * Signal \l stateChanged() is emitted with parameter FinishedState
 * when the reading has finished.
 */
bool QVersitReader::startReading()
{    if (d->state() == ActiveState || d->isRunning()) {
        d->setError(QVersitReader::NotReadyError);
        return false;
    } else if (!d->mIoDevice || !d->mIoDevice->isReadable()) {
        d->setError(QVersitReader::IOError);
        return false;
    } else {
        d->setState(ActiveState);
        d->setError(NoError);
        d->setCanceling(false);
        d->start();
        return true;
    }
}

/*!
 * Attempts to asynchronously cancel the read request.
 */
void QVersitReader::cancel()
{
    d->setCanceling(true);
}

/*!
 * If the state is ActiveState, blocks until the reader has finished reading or \a msec milliseconds
 * has elapsed, returning true if it successfully finishes or is cancelled by the user.
 * If the state is FinishedState, returns true immediately.
 * Otherwise, returns false immediately.
 */
bool QVersitReader::waitForFinished(int msec)
{
    State state = d->state();
    if (state == ActiveState) {
        return d->wait(msec);
    } else if (state == FinishedState) {
        return true;
    } else {
        return false;
    }
}

/*!
 * Returns the reading result.  Even if there was an error or reading has not completed, a partial
 * list of results may be returned.
 */
QList<QVersitDocument> QVersitReader::results() const
{
    QMutexLocker locker(&d->mMutex);
    return d->mVersitDocuments;
}

/*!
 * Returns the state of the reader.
 */
QVersitReader::State QVersitReader::state() const
{
    return d->state();
}

/*!
 * Returns the error encountered by the last operation.
 */
QVersitReader::Error QVersitReader::error() const
{
    return d->error();
}

/*! \internal */
bool QVersitReader::readAll()
{
    startReading();
    return waitForFinished();
}

/*! \internal */
QList<QVersitDocument> QVersitReader::result() const
{
    return results();
}

#include "moc_qversitreader.cpp"