#ifndef WIFIMEASUREMENT_H
#define WIFIMEASUREMENT_H

#include "AccessPoint.h"
#include "../../data/Timestamp.h"

/**
 * describes a measurement received for one access-point at a given time
 */
class WiFiMeasurement {

private:

	friend class VAPGrouper;

	/** the access-point we got a measurement for */
	AccessPoint ap;

	/** the measured signal strength */
	float rssi;

	/** OPTIONAL. frequence the signal was received */
	float freq = NAN;

	/** OPTIONAL. timestamp the measurement was recorded at */
	Timestamp ts;

public:

	/** ctor */
	WiFiMeasurement(const AccessPoint& ap, const float rssi) : ap(ap), rssi(rssi), freq(NAN) {
		;
	}

	/** ctor with freq*/
	WiFiMeasurement(const AccessPoint& ap, const float rssi, const float freq) : ap(ap), rssi(rssi), freq(freq) {
			;
	}

	/** ctor with timestamp */
	WiFiMeasurement(const AccessPoint& ap, const float rssi, const Timestamp ts) : ap(ap), rssi(rssi), freq(NAN), ts(ts) {
			;
	}

	/** ctor with timestamp and freq*/
	WiFiMeasurement(const AccessPoint& ap, const float rssi, const float freq, const Timestamp ts) : ap(ap), rssi(rssi), freq(freq), ts(ts) {
			;
	}

public:

	/** get the AP we got the measurement for */
	const AccessPoint& getAP() const {return ap;}

	/** get the measurement's signal strength */
	float getRSSI() const {return rssi;}

	/** OPTIONAL: get the measurement's timestamp (if known!) */
	const Timestamp& getTimestamp() const {return ts;}

	/** timestamp known? */
	bool hasTimestamp() const {return ts == ts;}

	/** OPTIONAL: get the measurement's frequency (if known!) */
	float getFrequency() const {return freq;}

	/** frequency known? */
	bool hasFrequency() const {return freq == freq;}

	/** set another signal strength */
	void setRssi(float value){rssi = value;}

	/** set the timestamp */
	void setTimestamp(const Timestamp& val){ts = val;}

	/** as string for debug printing */
	std::string asString() const {
		std::string res = ap.asString();
		if (hasTimestamp()) {res += " @" + std::to_string(ts.ms());}
		if (hasFrequency()) {res += " " + std::to_string((int)freq) + " MHz";}
		res += " - " + std::to_string(rssi) + " dBm ";
		return res;
	}

};



#endif // WIFIMEASUREMENT_H