package edu.stanford.rsl.conrad.rendering;

import java.util.ArrayList;
import java.util.Stack;

import edu.stanford.rsl.conrad.geometry.shapes.simple.Edge;
import edu.stanford.rsl.conrad.geometry.shapes.simple.ProjectPointToLineComparator;
import edu.stanford.rsl.conrad.physics.PhysicalObject;
import edu.stanford.rsl.conrad.physics.PhysicalPoint;

public class PriorityRayTracer extends AbstractRayTracer {

	public PriorityRayTracer() {
		comparator = new ProjectPointToLineComparator();
	}
	
	@Override
	protected ArrayList<PhysicalObject> computeMaterialIntersectionSegments(PhysicalPoint [] rayList){
		ArrayList<PhysicalObject> segments = new ArrayList<PhysicalObject>();
		// determine ray segments

		Stack<PhysicalObject> materialStack = new Stack<PhysicalObject>();
		materialStack.push(rayList[0].getObject());
		for (int k=1; k < rayList.length;k++){
			PhysicalObject obj = new PhysicalObject();
				Edge edge = new Edge(rayList[k-1], rayList[k]);
				obj.setShape(edge);

				//System.out.println(rayList[k]);

				// Choose Material with hightest priority.
				//if (!materialStack.empty()){
				//for (PhysicalObject integer :materialStack){
				//if (integer.intValue() > color){
				//color = integer.intValue();
				//}
				//}
				if(materialStack.isEmpty()) {
					obj.setMaterial(scene.getBackgroundMaterial());
					obj.setNameString("Background");
				} else {
					PhysicalObject current = materialStack.peek();
					int currentP = ((PrioritizableScene) scene).getPriority(current);
					for (PhysicalObject integer :materialStack){
						if(((PrioritizableScene) scene).getPriority(integer) > currentP){
							currentP = ((PrioritizableScene) scene).getPriority(integer);
							current = integer;
						}
					}
					obj.setMaterial(current.getMaterial());
					obj.setNameString(current.getNameString());
					obj.setParent(current);
				}
				segments.add(obj);
				//}

				PhysicalObject nextObject = rayList[k].getObject();
				if (materialStack.contains(nextObject)){
					materialStack.remove(nextObject);
				} else {
					materialStack.push(nextObject);
				}
			
		}


		return segments;
	}


}
/*
 * Copyright (C) 2010-2014 Andreas Maier
 * CONRAD is developed as an Open Source project under the GNU General Public License (GPL).
*/