/*
   Copyright (C) 2001-2006, William Joseph.
   All Rights Reserved.

   This file is part of GtkRadiant.

   GtkRadiant is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.

   GtkRadiant 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 General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with GtkRadiant; if not, write to the Free Software
   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */

#if !defined( INCLUDED_IENTITY_H )
#define INCLUDED_IENTITY_H

#include "generic/constant.h"

#include "string/string.h"
#include "scenelib.h"

class EntityClass;

typedef Callback<void(const char*)> KeyObserver;

class EntityKeyValue
{
public:
virtual ~EntityKeyValue() = default;
virtual const char* c_str() const = 0;
virtual void assign( const char* other ) = 0;
virtual void attach( const KeyObserver& observer ) = 0;
virtual void detach( const KeyObserver& observer ) = 0;
};

class Entity
{
public:
STRING_CONSTANT( Name, "Entity" );

class Observer
{
public:
virtual void insert( const char* key, EntityKeyValue& value ) = 0;
virtual void erase( const char* key, EntityKeyValue& value ) = 0;
virtual void clear() { };
};

class Visitor
{
public:
virtual void visit( const char* key, const char* value ) = 0;
};

virtual const EntityClass& getEntityClass() const = 0;
virtual void forEachKeyValue( Visitor& visitor ) const = 0;
virtual void setKeyValue( const char* key, const char* value ) = 0;
virtual const char* getKeyValue( const char* key ) const = 0;
virtual bool isContainer() const = 0;
virtual void attach( Observer& observer ) = 0;
virtual void detach( Observer& observer ) = 0;
};

class EntityCopyingVisitor : public Entity::Visitor
{
Entity& m_entity;
public:
EntityCopyingVisitor( Entity& entity )
	: m_entity( entity ){
}

void visit( const char* key, const char* value ){
	if ( !string_equal( key, "classname" ) ) {
		m_entity.setKeyValue( key, value );
	}
}
};

inline Entity* Node_getEntity( scene::Node& node ){
	return NodeTypeCast<Entity>::cast( node );
}


template<typename value_type>
class Stack;
template<typename Contained>
class Reference;

namespace scene
{
class Node;
}

typedef Reference<scene::Node> NodeReference;

namespace scene
{
typedef Stack<NodeReference> Path;
}

class Counter;

class EntityCreator
{
public:
INTEGER_CONSTANT( Version, 2 );
STRING_CONSTANT( Name, "entity" );

virtual scene::Node& createEntity( EntityClass* eclass ) = 0;

typedef void ( *KeyValueChangedFunc )();
virtual void setKeyValueChangedFunc( KeyValueChangedFunc func ) = 0;

virtual void setCounter( Counter* counter ) = 0;

virtual void connectEntities( const scene::Path& e1, const scene::Path& e2, int index ) = 0;

virtual void setLightRadii( bool lightRadii ) = 0;
virtual bool getLightRadii() const = 0;
virtual void setShowNames( bool showNames ) = 0;
virtual bool getShowNames() = 0;
virtual void setShowAngles( bool showAngles ) = 0;
virtual bool getShowAngles() = 0;

virtual void printStatistics() const = 0;
};

#include "modulesystem.h"

template<typename Type>
class GlobalModule;
typedef GlobalModule<EntityCreator> GlobalEntityModule;

template<typename Type>
class GlobalModuleRef;
typedef GlobalModuleRef<EntityCreator> GlobalEntityModuleRef;

inline EntityCreator& GlobalEntityCreator(){
	return GlobalEntityModule::getTable();
}

#endif