/***************************************************************************
**
** Copyright (C) 2011 - 2012 Research In Motion
** Contact: https://www.qt.io/licensing/
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** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
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** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
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****************************************************************************/

#if !defined(QT_NO_CLIPBOARD)

#include "qqnxclipboard.h"

#include <QtGui/QColor>

#include <QtCore/QDebug>
#include <QtCore/QMimeData>
#include <QtCore/QStringList>
#include <QtCore/QUrl>

#include <clipboard/clipboard.h>
#include <errno.h>

#if defined(QQNXCLIPBOARD_DEBUG)
#define qClipboardDebug qDebug
#else
#define qClipboardDebug QT_NO_QDEBUG_MACRO
#endif

QT_BEGIN_NAMESPACE

// null terminated array
static const char *typeList[] = {"text/html", "text/plain", "image/png", "image/jpeg", "application/x-color", 0};

static QByteArray readClipboardBuff(const char *type)
{
    char *pbuffer;
    if (is_clipboard_format_present(type) == 0) {
        int size = get_clipboard_data(type, &pbuffer);
        if (size != -1 && pbuffer) {
            const QByteArray result = QByteArray(pbuffer, size);
            free(pbuffer);
            return result;
        }
    }

    return QByteArray();
}

class QQnxClipboard::MimeData : public QMimeData
{
    Q_OBJECT
public:
    MimeData(QQnxClipboard *clipboard)
        : QMimeData(),
          m_clipboard(clipboard),
          m_userMimeData(0)
    {
        Q_ASSERT(clipboard);

        for (int i = 0; typeList[i] != 0; ++i) {
            m_formatsToCheck << QString::fromUtf8(typeList[i]);
        }
    }

    ~MimeData()
    {
        delete m_userMimeData;
    }

    void addFormatToCheck(const QString &format) {
        m_formatsToCheck << format;
        qClipboardDebug() << "formats=" << m_formatsToCheck;
    }

    bool hasFormat(const QString &mimetype) const override
    {
        const bool result = is_clipboard_format_present(mimetype.toUtf8().constData()) == 0;
        qClipboardDebug() << "mimetype=" << mimetype << "result=" << result;
        return result;
    }

    QStringList formats() const override
    {
        QStringList result;

        Q_FOREACH (const QString &format, m_formatsToCheck) {
            if (is_clipboard_format_present(format.toUtf8().constData()) == 0)
                result << format;
        }

        qClipboardDebug() << "result=" << result;
        return result;
    }

    void setUserMimeData(QMimeData *userMimeData)
    {
        delete m_userMimeData;
        m_userMimeData = userMimeData;

        // system clipboard API doesn't allow detection of changes by other applications
        // simulate an owner change through delayed invocation
        // basically transfer ownership of data to the system clipboard once event processing resumes
        if (m_userMimeData)
            QMetaObject::invokeMethod(this, "releaseOwnership", Qt::QueuedConnection);
    }

    QMimeData *userMimeData()
    {
        return m_userMimeData;
    }

protected:
    QVariant retrieveData(const QString &mimetype, QVariant::Type preferredType) const override
    {
        qClipboardDebug() << "mimetype=" << mimetype << "preferredType=" << preferredType;
        if (is_clipboard_format_present(mimetype.toUtf8().constData()) != 0)
            return QMimeData::retrieveData(mimetype, preferredType);

        const QByteArray data = readClipboardBuff(mimetype.toUtf8().constData());
        return QVariant::fromValue(data);
    }

private Q_SLOTS:
    void releaseOwnership()
    {
        if (m_userMimeData) {
            qClipboardDebug() << "user data formats=" << m_userMimeData->formats() << "system formats=" << formats();
            delete m_userMimeData;
            m_userMimeData = 0;
            m_clipboard->emitChanged(QClipboard::Clipboard);
        }
    }

private:
    QQnxClipboard * const m_clipboard;

    QSet<QString> m_formatsToCheck;
    QMimeData *m_userMimeData;
};

QQnxClipboard::QQnxClipboard()
    : m_mimeData(new MimeData(this))
{
}

QQnxClipboard::~QQnxClipboard()
{
    delete m_mimeData;
}

void QQnxClipboard::setMimeData(QMimeData *data, QClipboard::Mode mode)
{
    if (mode != QClipboard::Clipboard)
        return;

    if (m_mimeData == data)
        return;

    if (m_mimeData->userMimeData() && m_mimeData->userMimeData() == data)
        return;

    empty_clipboard();

    m_mimeData->clear();
    m_mimeData->setUserMimeData(data);

    if (data == 0) {
        emitChanged(QClipboard::Clipboard);
        return;
    }

    const QStringList formats = data->formats();
    qClipboardDebug() << "formats=" << formats;

    Q_FOREACH (const QString &format, formats) {
        const QByteArray buf = data->data(format);

        if (buf.isEmpty())
            continue;

        int ret = set_clipboard_data(format.toUtf8().data(), buf.size(), buf.data());
        qClipboardDebug() << "set " << format << "to clipboard, size=" << buf.size() << ";ret=" << ret;
        if (ret)
            m_mimeData->addFormatToCheck(format);
    }

    emitChanged(QClipboard::Clipboard);
}

QMimeData *QQnxClipboard::mimeData(QClipboard::Mode mode)
{
    if (mode != QClipboard::Clipboard)
        return 0;

    if (m_mimeData->userMimeData())
        return m_mimeData->userMimeData();

    m_mimeData->clear();

    return m_mimeData;
}

QT_END_NAMESPACE

#include "qqnxclipboard.moc"

#endif //QT_NO_CLIPBOARD