/*
   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_ISELECTION_H )
#define INCLUDED_ISELECTION_H

#include <cstddef>
#include "generic/constant.h"
#include "generic/callback.h"
#include "signal/signalfwd.h"

class Renderer;
class View;

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

virtual void setSelected( bool select ) = 0;
virtual bool isSelected() const = 0;
};

namespace scene
{
class Instance;
}

class InstanceSelectionObserver
{
public:
virtual void onSelectedChanged( scene::Instance& instance ) = 0;
};

template<typename Element> class BasicVector3;
typedef BasicVector3<float> Vector3;
template<typename Element> class BasicVector4;
typedef BasicVector4<float> Vector4;
class Matrix4;
typedef Vector4 Quaternion;

typedef Callback<void(const Selectable&)> SelectionChangeCallback;
typedef SignalHandler1<const Selectable&> SelectionChangeHandler;

class SelectionSystem
{
public:
virtual ~SelectionSystem() = default;
INTEGER_CONSTANT( Version, 1 );
STRING_CONSTANT( Name, "selection" );

enum EMode
{
	eEntity,
	ePrimitive,
	eComponent,
};

enum EComponentMode
{
	eDefault,
	eVertex,
	eEdge,
	eFace,
};

enum EManipulatorMode
{
	eTranslate,
	eRotate,
	eScale,
	eDrag,
	eClip,
	eCreate,
	eEntSpawn,
	ePatchSpawn
};

virtual void SetMode( EMode mode ) = 0;
virtual EMode Mode() const = 0;
virtual void SetComponentMode( EComponentMode mode ) = 0;
virtual EComponentMode ComponentMode() const = 0;
virtual void SetManipulatorMode( EManipulatorMode mode ) = 0;
virtual EManipulatorMode ManipulatorMode() const = 0;

virtual SelectionChangeCallback getObserver( EMode mode ) = 0;
virtual std::size_t countSelected() const = 0;
virtual std::size_t countSelectedComponents() const = 0;
virtual void onSelectedChanged( scene::Instance& instance, const Selectable& selectable ) = 0;
virtual void onComponentSelection( scene::Instance& instance, const Selectable& selectable ) = 0;
virtual scene::Instance& ultimateSelected() const = 0;
virtual scene::Instance& penultimateSelected() const = 0;
virtual void setSelectedAll( bool selected ) = 0;
virtual void setSelectedAllComponents( bool selected ) = 0;

class Visitor
{
public:
virtual void visit( scene::Instance& instance ) const = 0;
};
virtual void foreachSelected( const Visitor& visitor ) const = 0;
virtual void foreachSelectedComponent( const Visitor& visitor ) const = 0;

virtual void addSelectionChangeCallback( const SelectionChangeHandler& handler ) = 0;

virtual void NudgeManipulator( const Vector3& nudge, const Vector3& view ) = 0;

virtual void translateSelected( const Vector3& translation ) = 0;
virtual void rotateSelected( const Quaternion& rotation ) = 0;
virtual void scaleSelected( const Vector3& scaling ) = 0;

virtual void pivotChanged() const = 0;
};

#include "modulesystem.h"

template<typename Type>
class GlobalModule;
typedef GlobalModule<SelectionSystem> GlobalSelectionModule;

template<typename Type>
class GlobalModuleRef;
typedef GlobalModuleRef<SelectionSystem> GlobalSelectionModuleRef;

inline SelectionSystem& GlobalSelectionSystem(){
	return GlobalSelectionModule::getTable();
}


#endif