# License: AGPL-3.0-or-later WITH Web-Template-Output-Additional-Permission-3.0-or-later
class Numeric
  # Works like Numeric#floor but uses an offset other than 1. Ex: 6.floor_for_delta(5) -> 5
  # @param [Integer] delta the integer offsets from zero to round down to
  # @return [Integer]
  def floor_for_delta(delta)
    raise ArgumentError.new('delta must be a positive integer') unless delta.is_a?(Integer) && delta > 0
    (self % delta).zero? ? self : ((self.to_i / delta)) * delta;
  end

  # Works like Numeric#ceil but uses an offset other than 1. Ex: 6.floor_for_delta(5) -> 10
  # @param [Integer] delta the integer offsets from zero to round up to
  # @return [Integer]
  def ceil_for_delta(delta)
    raise ArgumentError.new('delta must be a positive integer') unless delta.is_a?(Integer) && delta > 0
    (self % delta).zero? ?  self : ((self.floor.to_i / delta)+1) * delta;
  end
end