class Calculator {
private static final long MILLISECONDS = 1000;
private static final long SECONDS = 60;
private static final long MINUTES = 60;
public static String calculateETA(double size, double speed) {
if (speed <= 0) {
return "---";
}
size *= 1024;
double eta = (size / speed) * MILLISECONDS;
return formatMillisIntoHumanReadable(Math.round(eta));
}
private static String formatMillisIntoHumanReadable(long time) {
time /= MILLISECONDS;
int seconds = (int) (time % SECONDS);
time /= SECONDS;
int minutes = (int) (time % MINUTES);
time /= MINUTES;
int hours = (int) (time % 24);
int days = (int) (time / 24);
if (days == 0) {
return String.format("%d:%02d:%02d", hours, minutes, seconds);
} else {
return String.format("%dd%d:%02d:%02d", days, hours, minutes,
seconds);
}
}
}