package de.pixart.messenger.utils;

import android.location.Location;

import de.pixart.messenger.Config;

public final class LocationHelper {
    private static boolean isSameProvider(final String provider1, final String provider2) {
        if (provider1 == null) {
            return provider2 == null;
        }
        return provider1.equals(provider2);
    }

    public static boolean isBetterLocation(final Location location, final Location prevLoc) {
        if (prevLoc == null) {
            return true;
        }

        // Check whether the new location fix is newer or older
        final long timeDelta = location.getTime() - prevLoc.getTime();
        final boolean isSignificantlyNewer = timeDelta > Config.LOCATION_FIX_SIGNIFICANT_TIME_DELTA;
        final boolean isSignificantlyOlder = timeDelta < -Config.LOCATION_FIX_SIGNIFICANT_TIME_DELTA;
        final boolean isNewer = timeDelta > 0;

        if (isSignificantlyNewer) {
            return true;
        } else if (isSignificantlyOlder) {
            return false;
        }

        // Check whether the new location fix is more or less accurate
        final int accuracyDelta = (int) (location.getAccuracy() - prevLoc.getAccuracy());
        final boolean isLessAccurate = accuracyDelta > 0;
        final boolean isMoreAccurate = accuracyDelta < 0;
        final boolean isSignificantlyLessAccurate = accuracyDelta > 200;

        // Check if the old and new location are from the same provider
        final boolean isFromSameProvider = isSameProvider(location.getProvider(), prevLoc.getProvider());

        // Determine location quality using a combination of timeliness and accuracy
        if (isMoreAccurate) {
            return true;
        } else if (isNewer && !isLessAccurate) {
            return true;
        } else if (isNewer && !isSignificantlyLessAccurate && isFromSameProvider) {
            return true;
        }
        return false;
    }
}