package org.argeo.connect.util;
   
   import java.util.Calendar;
   import java.util.GregorianCalendar;
   
   /** Utilities around date and time management. */
   public class DateTimeUtils {
   	public static Integer computeAge(Calendar dateOfBirth) {
   		Calendar now = new GregorianCalendar();
  		int factor = 0;
  		if (now.get(Calendar.DAY_OF_YEAR) < dateOfBirth
  				.get(Calendar.DAY_OF_YEAR))
  			factor = -1;
  		Integer age = now.get(Calendar.YEAR) - dateOfBirth.get(Calendar.YEAR)
  				+ factor;
  		return age;
  	}
  
  	/* LENGTH AND DURATION MANAGEMENT */
  	/** returns corresponding hours for a HH:MM:SS representation */
  	public static long getHoursFromLength(long lengthInSeconds) {
  		return (lengthInSeconds / (60 * 60)) % 60;
  	}
  
  	/** returns corresponding minutes for a HH:MM:SS representation */
  	public static long getMinutesFromLength(long lengthInSeconds) {
  		return (lengthInSeconds / 60) % 60;
  	}
  
  	/** returns corresponding seconds for a HH:MM:SS representation */
  	public static long getSecondsFromLength(long lengthInSeconds) {
  		return lengthInSeconds % 60;
  	}
  
  	/** returns the length in second of a HH:MM:SS representation */
  	public static long getLengthFromHMS(int hours, int min, int secs) {
  		return 60 * 60 * hours + 60 * min + secs;
  	}
  
  	/** Approximate the length in seconds in minute, round to the closest minute */
  	public static long roundSecondsToMinutes(long lengthInSeconds) {
  		long grounded = (lengthInSeconds / 60);
  		if (getSecondsFromLength(lengthInSeconds) > 30)
  			grounded++;
  		return grounded;
  	}
  
  	/** format a duration in second using a hh:mm:ss pattern */
  	public static String getLengthFormattedAsString(long lengthInSeconds) {
  		return String.format("%02d:%02d:%02d",
  				getHoursFromLength(lengthInSeconds),
  				getMinutesFromLength(lengthInSeconds),
  				getSecondsFromLength(lengthInSeconds));
  	}
  
  	private DateTimeUtils() {
  	}
  }