/*
  This file is part of Ingen.
  Copyright 2012-2016 David Robillard <http://drobilla.net/>

  Ingen is free software: you can redistribute it and/or modify it under the
  terms of the GNU Affero General Public License as published by the Free
  Software Foundation, either version 3 of the License, or any later version.

  Ingen is distributed in the hope that it will be useful, but WITHOUT ANY
  WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  A PARTICULAR PURPOSE.  See the GNU Affero General Public License for details.

  You should have received a copy of the GNU Affero General Public License
  along with Ingen.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef INGEN_TURTLEWRITER_HPP
#define INGEN_TURTLEWRITER_HPP

#include "ingen/AtomSink.hpp"
#include "ingen/AtomWriter.hpp"
#include "ingen/URI.hpp"
#include "ingen/ingen.h"
#include "lv2/atom/atom.h"
#include "serd/serd.h"
#include "sratom/sratom.h"

#include <cstddef>
#include <cstdint>

namespace ingen {

class URIMap;
class URIs;

/** An Interface that writes Turtle messages to a sink method.
 *
 * Derived classes must implement text_sink() to do something with the
 * serialized messages.
 */
class INGEN_API TurtleWriter : public AtomWriter, public AtomSink
{
public:
	TurtleWriter(URIMap& map, URIs& uris, URI uri);

	~TurtleWriter() override;

	/** AtomSink method which receives calls serialized to LV2 atoms. */
	bool write(const LV2_Atom* msg, int32_t default_id=0) override;

	/** Pure virtual text sink which receives calls serialized to Turtle. */
	virtual size_t text_sink(const void* buf, size_t len) = 0;

	URI uri() const override { return _uri; }

protected:
	URIMap&     _map;
	Sratom*     _sratom;
	SerdNode    _base;
	SerdURI     _base_uri{SERD_URI_NULL};
	SerdEnv*    _env;
	SerdWriter* _writer;
	URI         _uri;
	bool        _wrote_prefixes{false};
};

} // namespace ingen

#endif // INGEN_TURTLEWRITER_HPP