Gadgetbridge/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/hplus/HPlusDataRecordDaySlot.java

package nodomain.freeyourgadget.gadgetbridge.service.devices.hplus;

/*
* @author João Paulo Barraca <jpbarraca@gmail.com>
*/

import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.Locale;

import nodomain.freeyourgadget.gadgetbridge.model.ActivityKind;


public class HPlusDataRecordDaySlot extends HPlusDataRecord {

    /**
     * The device reports data aggregated in slots.
     * There are 144 slots in a given day, summarizing 10 minutes of data
     * Integer with the slot number from 0 to 143
     */
    public int slot;

    /**
     * Number of steps
     */
    public int steps;

    /**
     * Number of seconds without activity (TBC)
     */
    public int secondsInactive;

    /**
     * Average Heart Rate in Beats Per Minute
     */
    public int heartRate;

    public HPlusDataRecordDaySlot(byte[] data) {
        super(data, TYPE_DAY_SLOT);

        int a = (data[4] & 0xFF) * 256 + (data[5] & 0xFF);
        if (a >= 144) {
            throw new IllegalArgumentException("Invalid Slot Number");
        }

        slot = a;
        heartRate = data[1] & 0xFF;

        if(heartRate == 255 || heartRate == 0)
            heartRate = ActivityKind.TYPE_NOT_MEASURED;

        steps = (data[2] & 0xFF) * 256 + data[3] & 0xFF;

        //?? data[6]; atemp?? always 0
        secondsInactive = data[7] & 0xFF; // ?

        Calendar slotTime = GregorianCalendar.getInstance();

        slotTime.set(Calendar.MINUTE, (slot % 6) * 10);
        slotTime.set(Calendar.HOUR_OF_DAY, slot / 6);
        slotTime.set(Calendar.SECOND, 0);

        timestamp = (int) (slotTime.getTimeInMillis() / 1000L);
    }

    public String toString(){
        Calendar slotTime = GregorianCalendar.getInstance();
        slotTime.setTimeInMillis(timestamp * 1000L);
        return String.format(Locale.US, "Slot: %d, Time: %s, Steps: %d, InactiveSeconds: %d, HeartRate: %d", slot, slotTime.getTime(), steps, secondsInactive, heartRate);
    }

    public void add(HPlusDataRecordDaySlot other){
        if(other == null)
            return;

        steps += other.steps;
        secondsInactive += other.secondsInactive;
        if(heartRate == -1)
            heartRate = other.heartRate;
        else if(other.heartRate != -1) {
            heartRate = (heartRate + other.heartRate) / 2;
        }
    }
}