package org.papervision3d.core.geom {
	import org.papervision3d.core.culling.IObjectCuller;
	import org.papervision3d.core.geom.renderables.Vertex3D;
	import org.papervision3d.core.math.Matrix3D;
	import org.papervision3d.core.math.Number3D;
	import org.papervision3d.core.proto.GeometryObject3D;
	import org.papervision3d.core.render.data.RenderSessionData;
	import org.papervision3d.objects.DisplayObject3D;	
	/**
	* The Vertices3D class lets you create and manipulate groups of vertices.
	*
	*/
	public class Vertices3D extends DisplayObject3D
	{
		/**
		* Creates a new Vertices3D object.
		*
		*
		* @param	vertices	An array of Vertex3D objects for the vertices of the mesh.
		* <p/>
		*/
		public function Vertices3D( vertices:Array, name:String=null )
		{
			super( name, new GeometryObject3D() );
			this.geometry.vertices = vertices || new Array();
		}

		/**
		 * Clones this object.
		 * 
		 * @return	The cloned DisplayObject3D.
		 */ 
		public override function clone():DisplayObject3D
		{
			var object:DisplayObject3D = super.clone();
			var verts:Vertices3D = new Vertices3D(null, object.name);
			
			verts.material = object.material;
			if(object.materials)
				verts.materials = object.materials.clone();
				
			if(this.geometry)
				verts.geometry = this.geometry.clone(verts);
				
			verts.copyTransform(this);
			
			return verts;
		}
		
		/**
		* Projects three dimensional coordinates onto a two dimensional plane to simulate the relationship of the camera to subject.
		*
		* This is the first step in the process of representing three dimensional shapes two dimensionally.
		*
		* @param	camera		Camera.
		*/
		public override function project( parent :DisplayObject3D,  renderSessionData:RenderSessionData ):Number
		{
			super.project( parent, renderSessionData );

			if( this.culled )
				return 0;
				
			if( renderSessionData.camera is IObjectCuller )
				return projectFrustum(parent, renderSessionData);
			
			if(!this.geometry || !this.geometry.vertices)
				return 0;
				
			return renderSessionData.camera.projectVertices(this.geometry.vertices, this, renderSessionData);
		}
		
		public function projectEmpty(parent:DisplayObject3D, renderSessionData:RenderSessionData):Number{
			
			return super.project( parent, renderSessionData );
		}

		/**
		 * 
		 * @param	parent
		 * @param	camera
		 * @param	sorted
		 * @return
		 */
		public function projectFrustum( parent :DisplayObject3D, renderSessionData:RenderSessionData ):Number 
		{
			return 0;
		}
		
		/**
		* Calculates 3D bounding box.
		*
		* @return	{min : Number3D, max : Number3D, size : Number3D}
		*/
		public function boundingBox():Object
		{
			var vertices :Array = this.geometry.vertices;
			var bBox     :Object = new Object();

			bBox.min  = new Number3D(Number.MAX_VALUE, Number.MAX_VALUE, Number.MAX_VALUE);
			bBox.max  = new Number3D(-Number.MAX_VALUE, -Number.MAX_VALUE, -Number.MAX_VALUE);
			bBox.size = new Number3D();

			for each(var v:Vertex3D in vertices)
			{
				bBox.min.x = Math.min( v.x, bBox.min.x );
				bBox.min.y = Math.min( v.y, bBox.min.y );
				bBox.min.z = Math.min( v.z, bBox.min.z );
				
				bBox.max.x = Math.max( v.x, bBox.max.x );
				bBox.max.y = Math.max( v.y, bBox.max.y );
				bBox.max.z = Math.max( v.z, bBox.max.z );
			}

			bBox.size.x = bBox.max.x - bBox.min.x;
			bBox.size.y = bBox.max.y - bBox.min.y;
			bBox.size.z = bBox.max.z - bBox.min.z;

			return bBox;
		}

		/**
		* Calculates 3D bounding box in world space.
		*
		* @return	{minX, maxX, minY, maxY, minZ, maxZ}
		*/
		
		public function worldBoundingBox () : Object
		{
			
			// TODO requires optimisation : would be better to apply world matrix to local bounds
			var vertices : Array = this.geometry.vertices ;
			
			var bBox :Object = new Object();
			
			bBox.min = new Number3D(Number.MAX_VALUE, Number.MAX_VALUE, Number.MAX_VALUE);
			bBox.max = new Number3D(-Number.MAX_VALUE, -Number.MAX_VALUE, -Number.MAX_VALUE);
			bBox.size = new Number3D();
			
			var tempV : Number3D ;
			
			for each(var v:Vertex3D in vertices)
			{
				tempV = v.getPosition () ;
				Matrix3D.multiplyVector ( this.world, tempV ) ;
				
				bBox.min.x = Math.min ( tempV.x, bBox.min.x );
				bBox.min.y = Math.min ( tempV.y, bBox.min.y );
				bBox.min.z = Math.min ( tempV.z, bBox.min.z );
				
				bBox.max.x = Math.max ( tempV.x, bBox.max.x );
				bBox.max.y = Math.max ( tempV.y, bBox.max.y );
				bBox.max.z = Math.max ( tempV.z, bBox.max.z );
			}
			
			bBox.size.x = bBox.max.x - bBox.min.x;
			bBox.size.y = bBox.max.y - bBox.min.y;
			bBox.size.z = bBox.max.z - bBox.min.z;
			
			return bBox;
		}

		public function transformVertices( transformation:Matrix3D ):void
		{
			
			geometry.transformVertices(transformation);

		}
	}
}