// -*- C++ -*-
/**
 * \file qt4/GuiClipboard.cpp
 * This file is part of LyX, the document processor.
 * Licence details can be found in the file COPYING.
 *
 * \author John Levon
 * \author Abdelrazak Younes
 *
 * Full author contact details are available in file CREDITS.
 */

#include <config.h>

#include "GuiClipboard.h"
#include "qt_helpers.h"

#include "support/debug.h"

#include <QApplication>
#include <QClipboard>
#include <QMimeData>
#include <QString>

#include "support/lstrings.h"

using namespace std;
using namespace lyx::support;

static char const * const mime_type = "application/x-lyx";

namespace lyx {

namespace frontend {

GuiClipboard::GuiClipboard()
{
	connect(qApp->clipboard(), SIGNAL(dataChanged()),
		this, SLOT(on_dataChanged()));
	// initialize clipboard status.
	on_dataChanged();
}


string const GuiClipboard::getAsLyX() const
{
	LYXERR(Debug::ACTION, "GuiClipboard::getAsLyX(): `");
	// We don't convert encodings here since the encoding of the
	// clipboard contents is specified in the data itself
	QMimeData const * source =
		qApp->clipboard()->mimeData(QClipboard::Clipboard);
	if (!source) {
		LYXERR(Debug::ACTION, "' (no QMimeData)");
		return string();
	}
	if (source->hasFormat(mime_type)) {
		// data from ourself or some other LyX instance
		QByteArray const ar = source->data(mime_type);
		string const s(ar.data(), ar.count());
		LYXERR(Debug::ACTION, s << "'");
		return s;
	}
	LYXERR(Debug::ACTION, "'");
	return string();
}


docstring const GuiClipboard::getAsText() const
{
	// text data from other applications
	QString const str = qApp->clipboard()->text(QClipboard::Clipboard)
				.normalized(QString::NormalizationForm_C);
	LYXERR(Debug::ACTION, "GuiClipboard::getAsText(): `" << fromqstr(str) << "'");
	if (str.isNull())
		return docstring();

	return internalLineEnding(qstring_to_ucs4(str));
}


void GuiClipboard::put(string const & lyx, docstring const & text)
{
	LYXERR(Debug::ACTION, "GuiClipboard::put(`" << lyx << "' `"
			      << to_utf8(text) << "')");
	// We don't convert the encoding of lyx since the encoding of the
	// clipboard contents is specified in the data itself
	QMimeData * data = new QMimeData;
	if (!lyx.empty()) {
		QByteArray const qlyx(lyx.c_str(), lyx.size());
		data->setData(mime_type, qlyx);
	}
	// Don't test for text.empty() since we want to be able to clear the
	// clipboard.
	QString const qtext = toqstr(text);
	data->setText(qtext);
	qApp->clipboard()->setMimeData(data, QClipboard::Clipboard);
}


bool GuiClipboard::hasLyXContents() const
{
	QMimeData const * const source =
		qApp->clipboard()->mimeData(QClipboard::Clipboard);
	return source && source->hasFormat(mime_type);
}


bool GuiClipboard::isInternal() const
{
	// ownsClipboard() is also true for stuff coming from dialogs, e.g.
	// the preamble dialog
	// FIXME: This does only work on X11, since ownsClipboard() is
	// hardwired to return false on Windows and OS X.
	return qApp->clipboard()->ownsClipboard() && hasLyXContents();
}


bool GuiClipboard::hasInternal() const
{
	// Windows and Mac OS X does not have the concept of ownership;
	// the clipboard is a fully global resource so all applications 
	// are notified of changes.
#if (defined(Q_WS_X11))
	return true;
#else
	return false;
#endif
}


void GuiClipboard::on_dataChanged()
{
	text_clipboard_empty_ = qApp->clipboard()->
		text(QClipboard::Clipboard).isEmpty();

	has_lyx_contents_ = hasLyXContents();
}


bool GuiClipboard::empty() const
{
	// We need to check both the plaintext and the LyX version of the
	// clipboard. The plaintext version is empty if the LyX version
	// contains only one inset, and the LyX version is empty if the
	// clipboard does not come from LyX.
	if (!text_clipboard_empty_)
		return false;
	return !has_lyx_contents_;
}

} // namespace frontend
} // namespace lyx

#include "GuiClipboard_moc.cpp"