#ifndef WIFISENSORANDROID_H
#define WIFISENSORANDROID_H


#ifdef ANDROID

#include <QAndroidJniObject>

#include "Debug.h"
#include "WiFiSensor.h"

class WiFiSensorAndroid : public WiFiSensor {

private:

	/** hidden ctor. use singleton! */
	WiFiSensorAndroid() {;}

public:

	/** singleton access */
	static WiFiSensorAndroid& get() {
		static WiFiSensorAndroid wifi;
		return wifi;
	}

	void start() override {

		// start scanning
		int res = QAndroidJniObject::callStaticMethod<int>("java/indoor/WiFi", "start", "()I");
		(void) res;

	}

	/** called from java. handle the given incoming scan result */
	void handle(const std::string& data) {

		// to-be-constructed sensor data
		WiFiSensorData sensorData;

		// parse each mac->rssi entry
		for (int i = 0; i < (int)data.length(); i += 17+1+2) {
			const std::string bssid = data.substr(i, 17);
			const int8_t rssi = data[i+17];
			const int8_t pad1 = data[i+18];
			const int8_t pad2 = data[i+19];
			if (pad1 != 0 || pad2 != 0) {Debug::error("padding error within WiFi scan result");}
			sensorData.entries.push_back(WiFiSensorDataEntry(bssid, rssi));
		}

		// call listeners
		informListeners(sensorData);

	}

};


extern "C" {

	/** called after each successful WiFi scan */
	JNIEXPORT void JNICALL Java_java_indoor_WiFi_onScanComplete(JNIEnv* env, jobject jobj, jbyteArray arrayID) {
		(void) env; (void) jobj;
		jsize length = env->GetArrayLength(arrayID);
		jboolean isCopy;
		jbyte* data = env->GetByteArrayElements(arrayID, &isCopy);
		std::string str((char*)data, length);
		env->ReleaseByteArrayElements(arrayID, data, JNI_ABORT);
		WiFiSensorAndroid::get().handle(str);
	}

}

#endif

#endif // WIFISENSORANDROID_H