package pk.lucidxpo.ynami.utils;
   
   import org.joda.time.DateTime;
   import org.joda.time.LocalDateTime;
   
   import java.util.Date;
   import java.util.List;
   import java.util.Random;
   
  import static com.google.common.collect.Lists.newArrayList;
  import static java.util.Arrays.asList;
  import static org.joda.time.DateTimeZone.UTC;
  
  public final class Randomly {
      public static final Random RANDOM = new Random(new Date().getTime());
  
      private Randomly() {
      }
  
      @SafeVarargs
      public static <T> T chooseOneOf(final T... values) {
          return chooseOneOf(asList(values));
      }
  
      public static <T> T chooseOneOf(final Iterable<T> values) {
          return chooseOneOf(list(values));
      }
  
      private static <T> T chooseOneOf(final List<T> list) {
          if (list.isEmpty()) {
              throw new IllegalArgumentException("List was empty");
          }
          return list.get((int) chooseNumberBetween(0L, list.size() - 1L));
      }
  
      private static <T> List<T> list(final Iterable<T> values) {
          return newArrayList(values);
      }
  
      public static long chooseNumberBetween(final long from, final long to) {
          final long range = to - from + 1;
          final long fraction = (long) (range * RANDOM.nextDouble());
          return from + fraction;
      }
  
      public static LocalDateTime chooseLocalDateBetween(final LocalDateTime from, final LocalDateTime to) {
          return chooseDateBetween(
                  from.toDateTime(UTC),
                  to.toDateTime(UTC)).
                  toLocalDateTime();
      }
  
      public static DateTime chooseDateBetween(final DateTime from, final DateTime to) {
          final long difference = to.getMillis() - from.getMillis();
          return new DateTime(from.getMillis() + chooseNumberBetween(0, difference));
      }
  }