#ifndef CCS_EDGEUSE_GUARD
#define CCS_EDGEUSE_GUARD

#include "Edge.h"

namespace CCS {

	enum edgeUseDir_e {EUD_CCW, EUD_CW};

	class EdgeUse
	{

		public:
			Edge *edge;

			edgeUseDir_e dir;

			EdgeUse(Edge *edge, Vertex *useStartVert) :
				edge(edge)
			{
				if(edge->start == useStartVert) {
					this->dir = EUD_CCW;
				}
				else {
					this->dir = EUD_CW;
				}
			}

			EdgeUse(Edge *edge, edgeUseDir_e dir) :
				edge(edge), dir(dir)
			{
			}

			Vertex *getUseStart() {
				if(this->dir == EUD_CCW) return edge->start;
				else return edge->end;
			}

			Vertex *getUseEnd() {
				if(this->dir == EUD_CCW) return edge->end;
				else return edge->start;
			}

			/*
			 * Returns the OTHER face, as derived by THIS edge use's direction.
			 * So, the other face's corresponding edge use must have opposite direction.
			 */
			Face *getSharingFace() {
				if(this->dir == EUD_CCW) return edge->rightFace;
				else return edge->leftFace;
			}

	};

}

#endif /* CCS_EDGEUSE_GUARD */