#ifndef WIFIMODELLOGDISTCEILING_H
#define WIFIMODELLOGDISTCEILING_H

#include "../../../floorplan/v2/Floorplan.h"

#include "WiFiModel.h"
#include "LogDistanceModel.h"

/**
 * signal-strength estimation using log-distance model
 * including ceilings between AP and position
 */
class WiFiModelLogDistCeiling : public WiFiModel {

private:

	float txp;		// sending power (-40)
	float exp;		// path-loss-exponent (~2.0 - 4.0)
	float waf;		// attenuation per ceiling/floor (~-8.0)

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

public:

	/** ctor */
	WiFiModelLogDistCeiling(const float txp, const float exp, const float waf, const Floorplan::IndoorMap* map) : txp(txp), exp(exp), waf(waf) {

		Assert::isTrue(waf <= 0, "WAF must be a negative number!");

		// position of all ceilings
		for (Floorplan::Floor* f : map->floors) {
			ceilingsAtHeight_m.push_back(f->atHeight);
		}

	}

	/** get the given access-point's RSSI at the provided location */
	float getRSSI(const LocatedAccessPoint& ap, const Point3 p) override {
		const int numCeilings = numCeilingsBetween(ap.z, p.z);
		const float rssi = LogDistanceModel::distanceToRssi(txp, exp, ap.getDistance(p));
		return rssi + (numCeilings * waf);
	}

private:

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

		int cnt = 0;
		const float zMin = std::min(z1, z2);
		const float zMax = std::max(z1, z2);

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

		return cnt;

	}

};


#endif // WIFIMODELLOGDISTCEILING_H