#ifndef FLOORPLANCEILINGS_H
#define FLOORPLANCEILINGS_H

#include "Floorplan.h"

namespace Floorplan {

	/**
	 * helper-class for floorplan ceilings
	 * e.g. to determine the number of ceilings between two given positions
	 */
	class Ceilings {

	private:

		/** position (height) of all ceilings (in meter) */
		std::vector<float> ceilingsAtHeight_m;

	public:

		/** empty ctor */
		Ceilings() {
			;
		}

		/** ctor with the map to work with */
		Ceilings(const IndoorMap* map) {

			// sanity checks
			Assert::isTrue(map->floors.size() >= 1, "map has no floors?!");

			// get position of all ceilings
			for (Floorplan::Floor* f : map->floors) {

				const float h1 = f->atHeight;
				const float h2 = f->atHeight + f->height;

				if (std::find(ceilingsAtHeight_m.begin(), ceilingsAtHeight_m.end(), h1) == ceilingsAtHeight_m.end()) {
					ceilingsAtHeight_m.push_back(h1);
				}
				if (std::find(ceilingsAtHeight_m.begin(), ceilingsAtHeight_m.end(), h2) == ceilingsAtHeight_m.end()) {
					ceilingsAtHeight_m.push_back(h2);
				}

			}

		}

		/** get the number of ceilings between z1 and z2 */
		float numCeilingsBetweenFloat(const Point3 pos1, const Point3 pos2) const {

			// sanity checks
			Assert::isNot0(ceilingsAtHeight_m.size(), "no ceilings available for testing! incorrect map?");

			const float zMin = std::min(pos1.z, pos2.z);
			const float zMax = std::max(pos1.z, pos2.z);

			float cnt = 0;

			for (const float z : ceilingsAtHeight_m) {
				if (zMin < z && zMax > z) {
					const float dmax = zMax - z;
					cnt += (dmax > 1) ? (1) : (dmax);
				}
			}

			return cnt;

		}

		/** get the number of ceilings between z1 and z2 */
		int numCeilingsBetween(const Point3 pos1, const Point3 pos2) const {

			// sanity checks
			Assert::isNot0(ceilingsAtHeight_m.size(), "no ceilings available for testing! incorrect map?");

			// find min and max height given the to-be-compared points
			const float zMin = std::min(pos1.z, pos2.z);
			const float zMax = std::max(pos1.z, pos2.z);

	#ifdef WITH_ASSERTIONS

			static int numNear = 0;
			static int numFar = 0;
			for (const float z : ceilingsAtHeight_m) {
				const float diff = std::min( std::abs(z-zMin), std::abs(z-zMax) );
				if (diff < 0.1) {++numNear;} else {++numFar;}
			}
			if ((numNear + numFar) > 150000) {
				Assert::isTrue(numNear < numFar*0.1,
				    "many requests to Floorplan::Ceilings::numCeilingsBetween address nodes (very) near to a ground! \
					due to rounding issues, determining the number of floors between AP and point-in-question is NOT possible! \
					expect very wrong outputs! \
					consider adding the person's height to the questioned positions: p += Point3(0,0,1.3) "
				);
			}
	#endif

			int cnt = 0;
			for (const float z : ceilingsAtHeight_m) {
				if (zMin < z && zMax > z) {++cnt;}
			}

			return cnt;

		}

	};

}

#endif // FLOORPLANCEILINGS_H