package.scala

  implicit val arbitraryDate: Arbitrary[DateTime] = Arbitrary {
    val gmt = DateTimeZone.UTC
    for {
      year <- Gen.choose(1970, 2050)
      month <- Gen.choose(1, 12)
      day <- Gen.choose(1, 28) // TODO: there is a better way to get the number of days in a month -- see: http://www.exampledepot.com/egs/java.util/GetDaysInMonth.html
      hour <- Gen.choose(0, 23)
      minute <- Gen.choose(0, 59)
      second <- Gen.choose(0, 59)
      millis <- Gen.choose(0, 999)
    } yield new DateTime(year, month, day, hour, minute, second, millis, gmt)
  }

  def arbitraryDatesWithinDayRange(dayRange: Seq[Double]) = Arbitrary {
    for {
      since <- Arbitrary.arbitrary[DateTime]
      daysAfter <- Gen.oneOf(dayRange)
    } yield Pair(since, since.plusMinutes((daysAfter * 24 * 60).toInt))
  }