/*
  This file is part of Ingen.
  Copyright 2007-2015 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_NODE_HPP
#define INGEN_NODE_HPP

#include "ingen/Resource.hpp"
#include "ingen/ingen.h"
#include "ingen/types.hpp"
#include "lilv/lilv.h"
#include "raul/Path.hpp"

namespace Raul {
class Atom;
class Path;
class Symbol;
}

namespace Ingen {

class Arc;
class Store;

/** A node in the audio graph.
 *
 * The key property of nodes is that all nodes have a path and a symbol, as
 * well as a URI.
 *
 * To avoid ugly inheritance issues and the need for excessive use of
 * dynamic_cast, this class contains some members which are only applicable to
 * certain types of node.  There is a type tag which can be used to determine
 * the type of any Node.
 *
 * @ingroup Ingen
 */
class INGEN_API Node : public Resource
{
public:
	enum class GraphType {
		GRAPH,
		BLOCK,
		PORT
	};

	typedef std::pair<const Node*, const Node*> ArcsKey;
	typedef std::map< ArcsKey, SPtr<Arc> > Arcs;

	// Graphs only
	Arcs&       arcs()       { return _arcs; }
	const Arcs& arcs() const { return _arcs; }

	// Blocks and graphs only
	virtual uint32_t        num_ports()          const { return 0; }
	virtual Node*           port(uint32_t index) const { return NULL; }
	virtual const Resource* plugin()             const { return NULL; }

	// Plugin blocks only
	virtual LilvInstance* instance() { return NULL; }
	virtual bool          save_state(const std::string& dir) const { return false; }

	// All objects
	virtual GraphType           graph_type()   const = 0;
	virtual const Raul::Path&   path()         const = 0;
	virtual const Raul::Symbol& symbol()       const = 0;
	virtual Node*               graph_parent() const = 0;

	Raul::URI base_uri() const {
		if (uri()[uri().size() - 1] == '/') {
			return uri();
		}
		return Raul::URI(uri() + '/');
	}

	static Raul::URI main_uri() { return Raul::URI("ingen:/main"); }

	static bool uri_is_path(const Raul::URI& uri) {
		const size_t root_len = main_uri().length();
		if (uri == main_uri()) {
			return true;
		} else {
			return uri.substr(0, root_len + 1) == main_uri() + "/";
		}
	}

	static Raul::Path uri_to_path(const Raul::URI& uri) {
		return (uri == main_uri())
			? Raul::Path("/")
			: Raul::Path(uri.substr(main_uri().length()));
	}

	static Raul::URI path_to_uri(const Raul::Path& path) {
		return Raul::URI(main_uri() + path.c_str());
	}

protected:
	friend class Store;
	virtual void set_path(const Raul::Path& p) = 0;

	Node(const URIs& uris, const Raul::Path& path)
		: Resource(uris, path_to_uri(path))
	{}

	Arcs _arcs;  ///< Graphs only
};

} // namespace Ingen

#endif // INGEN_NODE_HPP