/*
   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
 */

///\file
///\brief Represents any entity which has a fixed size specified in its entity-definition and does not display a model (e.g. info_player_start).
///
/// This entity displays an axis-aligned bounding box of the size and colour specified in its entity-definition.
/// The "origin" key directly controls the entity's local-to-parent transform.
/// An arrow is drawn to visualise the "angle" key.

#include "cullable.h"
#include "renderable.h"
#include "editable.h"

#include "math/frustum.h"
#include "selectionlib.h"
#include "instancelib.h"
#include "transformlib.h"
#include "entitylib.h"
#include "render.h"
#include "eclasslib.h"
#include "math/line.h"

#include "targetable.h"
#include "origin.h"
#include "angles.h"
#include "filters.h"
#include "namedentity.h"
#include "keyobservers.h"
#include "namekeys.h"
#include "rotation.h"

#include "entity.h"


class RenderableArrow : public OpenGLRenderable
{
const Vector3& m_origin;
const Vector3& m_angles;

public:
RenderableArrow( const Vector3& origin, const Vector3& angles )
	: m_origin( origin ), m_angles( angles ){
}

void render( RenderStateFlags state ) const {
	Matrix4 mat = matrix4_rotation_for_euler_xyz_degrees( m_angles );
	arrow_draw( m_origin, matrix4_transformed_direction( mat, Vector3( 1, 0, 0 ) ), matrix4_transformed_direction( mat, Vector3( 0, 1, 0 ) ), matrix4_transformed_direction( mat, Vector3( 0, 0, 1 ) ) );
}
};

inline void read_aabb( AABB& aabb, const EntityClass& eclass ){
	aabb = aabb_for_minmax( eclass.mins, eclass.maxs );
}


class GenericEntity :
	public Cullable,
	public Bounded,
	public Snappable
{
EntityKeyValues m_entity;
KeyObserverMap m_keyObservers;
MatrixTransform m_transform;

OriginKey m_originKey;
Vector3 m_origin;
AnglesKey m_anglesKey;
Vector3 m_angles;

ClassnameFilter m_filter;
NamedEntity m_named;
NameKeys m_nameKeys;

AABB m_aabb_local;

RenderableArrow m_arrow;
RenderableSolidAABB m_aabb_solid;
RenderableWireframeAABB m_aabb_wire;
RenderableNamedEntity m_renderName;

Callback<void()> m_transformChanged;
Callback<void()> m_evaluateTransform;

void construct(){
	read_aabb( m_aabb_local, m_entity.getEntityClass() );

	m_keyObservers.insert( "classname", ClassnameFilter::ClassnameChangedCaller( m_filter ) );
	m_keyObservers.insert( Static<KeyIsName>::instance().m_nameKey, NamedEntity::IdentifierChangedCaller( m_named ) );
	m_keyObservers.insert( "angle", AnglesKey::AngleChangedCaller( m_anglesKey ) );
	m_keyObservers.insert( "angles", AnglesKey::AnglesChangedCaller( m_anglesKey ) );
	m_keyObservers.insert( "origin", OriginKey::OriginChangedCaller( m_originKey ) );
}

// vc 2k5 compiler fix
#if _MSC_VER >= 1400
public:
#endif

void updateTransform(){
	m_transform.localToParent() = g_matrix4_identity;
	matrix4_translate_by_vec3( m_transform.localToParent(), m_origin );
	m_transformChanged();
}
typedef MemberCaller<GenericEntity, void(), &GenericEntity::updateTransform> UpdateTransformCaller;
void originChanged(){
	m_origin = m_originKey.m_origin;
	updateTransform();
}
typedef MemberCaller<GenericEntity, void(), &GenericEntity::originChanged> OriginChangedCaller;
void anglesChanged(){
	m_angles = m_anglesKey.m_angles;
	updateTransform();
}
typedef MemberCaller<GenericEntity, void(), &GenericEntity::anglesChanged> AnglesChangedCaller;
public:

GenericEntity( EntityClass* eclass, scene::Node& node, const Callback<void()>& transformChanged, const Callback<void()>& evaluateTransform ) :
	m_entity( eclass ),
	m_originKey( OriginChangedCaller( *this ) ),
	m_origin( ORIGINKEY_IDENTITY ),
	m_anglesKey( AnglesChangedCaller( *this ) ),
	m_angles( ANGLESKEY_IDENTITY ),
	m_filter( m_entity, node ),
	m_named( m_entity ),
	m_nameKeys( m_entity ),
	m_arrow( m_aabb_local.origin, m_angles ),
	m_aabb_solid( m_aabb_local ),
	m_aabb_wire( m_aabb_local ),
	m_renderName( m_named, g_vector3_identity ),
	m_transformChanged( transformChanged ),
	m_evaluateTransform( evaluateTransform ){
	construct();
}
GenericEntity( const GenericEntity& other, scene::Node& node, const Callback<void()>& transformChanged, const Callback<void()>& evaluateTransform ) :
	m_entity( other.m_entity ),
	m_originKey( OriginChangedCaller( *this ) ),
	m_origin( ORIGINKEY_IDENTITY ),
	m_anglesKey( AnglesChangedCaller( *this ) ),
	m_angles( ANGLESKEY_IDENTITY ),
	m_filter( m_entity, node ),
	m_named( m_entity ),
	m_nameKeys( m_entity ),
	m_arrow( m_aabb_local.origin, m_angles ),
	m_aabb_solid( m_aabb_local ),
	m_aabb_wire( m_aabb_local ),
	m_renderName( m_named, g_vector3_identity ),
	m_transformChanged( transformChanged ),
	m_evaluateTransform( evaluateTransform ){
	construct();
}

InstanceCounter m_instanceCounter;
void instanceAttach( const scene::Path& path ){
	if ( ++m_instanceCounter.m_count == 1 ) {
		m_filter.instanceAttach();
		m_entity.instanceAttach( path_find_mapfile( path.begin(), path.end() ) );
		m_entity.attach( m_keyObservers );
	}
}
void instanceDetach( const scene::Path& path ){
	if ( --m_instanceCounter.m_count == 0 ) {
		m_entity.detach( m_keyObservers );
		m_entity.instanceDetach( path_find_mapfile( path.begin(), path.end() ) );
		m_filter.instanceDetach();
	}
}

EntityKeyValues& getEntity(){
	return m_entity;
}
const EntityKeyValues& getEntity() const {
	return m_entity;
}

Namespaced& getNamespaced(){
	return m_nameKeys;
}
Nameable& getNameable(){
	return m_named;
}
TransformNode& getTransformNode(){
	return m_transform;
}

const AABB& localAABB() const {
	return m_aabb_local;
}

VolumeIntersectionValue intersectVolume( const VolumeTest& volume, const Matrix4& localToWorld ) const {
	return volume.TestAABB( localAABB(), localToWorld );
}

void renderArrow( Renderer& renderer, const VolumeTest& volume, const Matrix4& localToWorld ) const {
	if ( g_showAngles ) {
		renderer.addRenderable( m_arrow, localToWorld );
	}
}
void renderSolid( Renderer& renderer, const VolumeTest& volume, const Matrix4& localToWorld ) const {
	renderer.SetState( m_entity.getEntityClass().m_state_fill, Renderer::eFullMaterials );
	renderer.addRenderable( m_aabb_solid, localToWorld );
	renderArrow( renderer, volume, localToWorld );
}
void renderWireframe( Renderer& renderer, const VolumeTest& volume, const Matrix4& localToWorld ) const {
	renderer.SetState( m_entity.getEntityClass().m_state_wire, Renderer::eWireframeOnly );
	renderer.addRenderable( m_aabb_wire, localToWorld );
	renderArrow( renderer, volume, localToWorld );
	if ( g_showNames ) {
		renderer.addRenderable( m_renderName, localToWorld );
	}
}


void testSelect( Selector& selector, SelectionTest& test, const Matrix4& localToWorld ){
	test.BeginMesh( localToWorld );

	SelectionIntersection best;
	aabb_testselect( m_aabb_local, test, best );
	if ( best.valid() ) {
		selector.addIntersection( best );
	}
}

void translate( const Vector3& translation ){
	m_origin = origin_translated( m_origin, translation );
}
void rotate( const Quaternion& rotation ){
	m_angles = angles_rotated( m_angles, rotation );
}
void snapto( float snap ){
	m_originKey.m_origin = origin_snapped( m_originKey.m_origin, snap );
	m_originKey.write( &m_entity );
}
void revertTransform(){
	m_origin = m_originKey.m_origin;
	m_angles = m_anglesKey.m_angles;
}
void freezeTransform(){
	m_originKey.m_origin = m_origin;
	m_originKey.write( &m_entity );
	m_anglesKey.m_angles = m_angles;
	m_anglesKey.write( &m_entity );
}
void transformChanged(){
	revertTransform();
	m_evaluateTransform();
	updateTransform();
}
typedef MemberCaller<GenericEntity, void(), &GenericEntity::transformChanged> TransformChangedCaller;
};

class GenericEntityInstance :
	public TargetableInstance,
	public TransformModifier,
	public Renderable,
	public SelectionTestable
{
class TypeCasts
{
InstanceTypeCastTable m_casts;
public:
TypeCasts(){
	m_casts = TargetableInstance::StaticTypeCasts::instance().get();
	InstanceContainedCast<GenericEntityInstance, Bounded>::install( m_casts );
	InstanceContainedCast<GenericEntityInstance, Cullable>::install( m_casts );
	InstanceStaticCast<GenericEntityInstance, Renderable>::install( m_casts );
	InstanceStaticCast<GenericEntityInstance, SelectionTestable>::install( m_casts );
	InstanceStaticCast<GenericEntityInstance, Transformable>::install( m_casts );
	InstanceIdentityCast<GenericEntityInstance>::install( m_casts );
}
InstanceTypeCastTable& get(){
	return m_casts;
}
};

GenericEntity& m_contained;
mutable AABB m_bounds;
public:

typedef LazyStatic<TypeCasts> StaticTypeCasts;

Bounded& get( NullType<Bounded>){
	return m_contained;
}
Cullable& get( NullType<Cullable>){
	return m_contained;
}

STRING_CONSTANT( Name, "GenericEntityInstance" );

GenericEntityInstance( const scene::Path& path, scene::Instance* parent, GenericEntity& contained ) :
	TargetableInstance( path, parent, this, StaticTypeCasts::instance().get(), contained.getEntity(), *this ),
	TransformModifier( GenericEntity::TransformChangedCaller( contained ), ApplyTransformCaller( *this ) ),
	m_contained( contained ){
	m_contained.instanceAttach( Instance::path() );

	StaticRenderableConnectionLines::instance().attach( *this );
}
~GenericEntityInstance(){
	StaticRenderableConnectionLines::instance().detach( *this );

	m_contained.instanceDetach( Instance::path() );
}

void renderSolid( Renderer& renderer, const VolumeTest& volume ) const {
	m_contained.renderSolid( renderer, volume, Instance::localToWorld() );
}
void renderWireframe( Renderer& renderer, const VolumeTest& volume ) const {
	m_contained.renderWireframe( renderer, volume, Instance::localToWorld() );
}

void testSelect( Selector& selector, SelectionTest& test ){
	m_contained.testSelect( selector, test, Instance::localToWorld() );
}

void evaluateTransform(){
	if ( getType() == TRANSFORM_PRIMITIVE ) {
		m_contained.translate( getTranslation() );
		m_contained.rotate( getRotation() );
	}
}
void applyTransform(){
	m_contained.revertTransform();
	evaluateTransform();
	m_contained.freezeTransform();
}
typedef MemberCaller<GenericEntityInstance, void(), &GenericEntityInstance::applyTransform> ApplyTransformCaller;
};

class GenericEntityNode :
	public scene::Node::Symbiot,
	public scene::Instantiable,
	public scene::Cloneable
{
class TypeCasts
{
NodeTypeCastTable m_casts;
public:
TypeCasts(){
	NodeStaticCast<GenericEntityNode, scene::Instantiable>::install( m_casts );
	NodeStaticCast<GenericEntityNode, scene::Cloneable>::install( m_casts );
	NodeContainedCast<GenericEntityNode, Snappable>::install( m_casts );
	NodeContainedCast<GenericEntityNode, TransformNode>::install( m_casts );
	NodeContainedCast<GenericEntityNode, Entity>::install( m_casts );
	NodeContainedCast<GenericEntityNode, Nameable>::install( m_casts );
	NodeContainedCast<GenericEntityNode, Namespaced>::install( m_casts );
}
NodeTypeCastTable& get(){
	return m_casts;
}
};


InstanceSet m_instances;

scene::Node m_node;
GenericEntity m_contained;

public:
typedef LazyStatic<TypeCasts> StaticTypeCasts;

Snappable& get( NullType<Snappable>){
	return m_contained;
}
TransformNode& get( NullType<TransformNode>){
	return m_contained.getTransformNode();
}
Entity& get( NullType<Entity>){
	return m_contained.getEntity();
}
Nameable& get( NullType<Nameable>){
	return m_contained.getNameable();
}
Namespaced& get( NullType<Namespaced>){
	return m_contained.getNamespaced();
}

GenericEntityNode( EntityClass* eclass ) :
	m_node( this, this, StaticTypeCasts::instance().get() ),
	m_contained( eclass, m_node, InstanceSet::TransformChangedCaller( m_instances ), InstanceSetEvaluateTransform<GenericEntityInstance>::Caller( m_instances ) ){
}
GenericEntityNode( const GenericEntityNode& other ) :
	scene::Node::Symbiot( other ),
	scene::Instantiable( other ),
	scene::Cloneable( other ),
	m_node( this, this, StaticTypeCasts::instance().get() ),
	m_contained( other.m_contained, m_node, InstanceSet::TransformChangedCaller( m_instances ), InstanceSetEvaluateTransform<GenericEntityInstance>::Caller( m_instances ) ){
}
void release(){
	delete this;
}
scene::Node& node(){
	return m_node;
}

scene::Node& clone() const {
	return ( new GenericEntityNode( *this ) )->node();
}

scene::Instance* create( const scene::Path& path, scene::Instance* parent ){
	return new GenericEntityInstance( path, parent, m_contained );
}
void forEachInstance( const scene::Instantiable::Visitor& visitor ){
	m_instances.forEachInstance( visitor );
}
void insert( scene::Instantiable::Observer* observer, const scene::Path& path, scene::Instance* instance ){
	m_instances.insert( observer, path, instance );
}
scene::Instance* erase( scene::Instantiable::Observer* observer, const scene::Path& path ){
	return m_instances.erase( observer, path );
}
};

scene::Node& New_GenericEntity( EntityClass* eclass ){
	return ( new GenericEntityNode( eclass ) )->node();
}
