/* --------------------------------------------------------------------------

   libmusicbrainz5 - Client library to access MusicBrainz

   Copyright (C) 2012 Andrew Hawkins

   This file is part of libmusicbrainz5.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   libmusicbrainz5 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
   Lesser General Public License for more details.

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

     $Id$

----------------------------------------------------------------------------*/

#ifndef _MUSICBRAINZ5_ENTITY_H
#define _MUSICBRAINZ5_ENTITY_H

#include <iostream>
#include <string>
#include <sstream>
#include <map>

#include "musicbrainz5/xmlParser.h"

namespace MusicBrainz5
{
	class CEntityPrivate;

	class CRelationListList;

	class CEntity
	{
	public:
		CEntity();
		CEntity(const CEntity& Other);
		CEntity& operator =(const CEntity& Other);
		virtual ~CEntity();

		virtual CEntity *Clone()=0;

		void Parse(const XMLNode& Node);

		std::map<std::string,std::string> ExtAttributes() const;
		std::map<std::string,std::string> ExtElements() const;

		virtual std::ostream& Serialise(std::ostream& os) const;
		static std::string GetElementName();

	protected:
		void ProcessRelationList(const XMLNode& Node, CRelationListList* & RetVal);

		template<typename T>
		void ProcessItem(const XMLNode& Node, T* & RetVal)
		{
			RetVal=new T(Node);
		}

		template<class T>
		void ProcessItem(const XMLNode& Node, T& RetVal)
		{
			std::stringstream os;
			if (Node.getText())
				os << (const char *)Node.getText();

			os >> RetVal;
			if (os.fail())
			{
				std::cerr << "Error parsing value '";
				if (Node.getText())
					std::cerr << Node.getText();
				std::cerr << "'" << std::endl;
			}
		}

		template<typename T>
		void ProcessItem(const std::string& Text, T& RetVal)
		{
			std::stringstream os;
			os << Text;

			os >> RetVal;
			if (os.fail())
			{
				std::cerr << "Error parsing value '" << Text << "'" << std::endl;
			}
		}

		void ProcessItem(const XMLNode& Node, std::string& RetVal)
		{
			if (Node.getText())
				RetVal=Node.getText();
		}

		virtual void ParseAttribute(const std::string& Name, const std::string& Value)=0;
		virtual void ParseElement(const XMLNode& Node)=0;

	private:
		CEntityPrivate *m_d;

		void Cleanup();
	};
}

std::ostream& operator << (std::ostream& os, const MusicBrainz5::CEntity& Entity);

#endif