/*
  This file is part of Ingen.
  Copyright 2007-2017 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_ATOMWRITER_HPP
#define INGEN_ATOMWRITER_HPP

#include <string>

#include "ingen/AtomForgeSink.hpp"
#include "ingen/Interface.hpp"
#include "ingen/URIs.hpp"
#include "ingen/ingen.h"
#include "lv2/lv2plug.in/ns/ext/atom/Forge.hpp"

namespace Ingen {

class AtomSink;
class URIMap;

/** An Interface that writes LV2 atoms to an AtomSink. */
class INGEN_API AtomWriter : public Interface
{
public:
	AtomWriter(URIMap& map, URIs& uris, AtomSink& sink);

	Raul::URI uri() const {
		return Raul::URI("ingen:/clients/atom_writer");
	}

	void message(const Message& message) override;

	void operator()(const BundleBegin&);
	void operator()(const BundleEnd&);
	void operator()(const Connect&);
	void operator()(const Copy&);
	void operator()(const Del&);
	void operator()(const Delta&);
	void operator()(const Disconnect&);
	void operator()(const DisconnectAll&);
	void operator()(const Error&);
	void operator()(const Get&);
	void operator()(const Move&);
	void operator()(const Put&);
	void operator()(const Redo&);
	void operator()(const Response&);
	void operator()(const SetProperty&);
	void operator()(const Undo&);

private:
	using ScopedObject = lv2::atom::Forge::ScopedObject;

	struct ScopedEmitter
	{
		ScopedEmitter(AtomWriter& writer) : writer(writer) {}
		~ScopedEmitter() { writer.finish_msg(); }

		ScopedEmitter(const ScopedEmitter&) = delete;
		ScopedEmitter& operator=(const ScopedEmitter&) = delete;

		AtomWriter& writer;
	};

	struct ScopedMessage
	{
		ScopedMessage(AtomWriter&    writer,
		              const LV2_URID type,
		              const int32_t  seq = 0)
			: emitter(writer)
			, object(writer._forge, 0, type)
		{
			if (seq) {
				object.key(writer._uris.patch_sequenceNumber);
				writer._forge.write(seq);
			}
		}

		ScopedEmitter emitter;
		ScopedObject  object;
	};

	void forge_uri(const Raul::URI& uri);
	void forge_properties(ScopedObject& object, const Properties& properties);
	void forge_arc(const Raul::Path& tail, const Raul::Path& head);
	void forge_request(LV2_Atom_Forge_Frame* frame, LV2_URID type, int32_t id);
	void forge_context(ScopedMessage& message, Resource::Graph ctx);

	void finish_msg();

	URIMap&          _map;
	URIs&            _uris;
	AtomSink&        _sink;
	AtomForgeSink    _out;
	lv2::atom::Forge _forge;
};

} // namespace Ingen

#endif // INGEN_ATOMWRITER_HPP