module SpeedConversion
  # Proxy = Meter per Second

  def to_meter_per_second
    case @unit
    when 'mile_per_second'
      @measurement *= 0.3048 * 5280
    when 'mile_per_hour'
      @measurement *= 0.44704
    when 'kilometer_per_hour'
      @measurement *= 0.277778
    when 'knot'
      @measurement *= 0.514444
    when 'kilometer_per_second'
      @measurement *= 1000.0
    end
  end

  def to_kilometer_per_second
    if @unit == 'meter_per_second'
      @measurement /= 1000
    else
      self.to_meter_per_second
      @unit = 'meter_per_second'
      self.to_kilometer_per_second
    end
  end

  def to_kilometer_per_hour
    if @unit == 'meter_per_second'
      @measurement *= 3.6
    else
      self.to_meter_per_second
      @unit = 'meter_per_second'
      self.to_kilometer_per_hour
    end
  end

  def to_knot
    if @unit == 'meter_per_second'
      @measurement *= 1.94384449
    else
      self.to_meter_per_second
      @unit = 'meter_per_second'
      self.to_knot
    end
  end

  def to_mile_per_second
    if @unit == 'meter_per_second'
      @measurement *= 2.23693629 / 60 / 60
    else
      self.to_meter_per_second
      @unit = 'meter_per_second'
      self.to_mile_per_second
    end
  end

  def to_mile_per_hour
    if @unit == 'meter_per_second'
      @measurement *= 2.23693629
    else
      self.to_meter_per_second
      @unit = 'meter_per_second'
      self.to_mile_per_hour
    end
  end

end