require 'earth/fuel'
class BusClass < ActiveRecord::Base
  self.primary_key = "name"
  
  # https://spreadsheets.google.com/pub?key=0AoQJbWqPrREqdHY0R0hjZnhRaTIxTnpvRk1HNThwUmc&hl=en&output=html
  falls_back_on :passengers => 7.485,
                :distance => 4.9726.miles.to(:kilometres),
                :distance_units => 'kilometres',
                :speed => 19.849.miles.to(:kilometres),
                :speed_units => 'kilometres_per_hour',
                :gasoline_intensity => 0.00064134.gallons_per_mile.to(:litres_per_kilometre),
                :gasoline_intensity_units => 'litres_per_kilometre',
                :diesel_intensity => 0.13836.gallons_per_mile.to(:litres_per_kilometre),
                :diesel_intensity_units => 'litres_per_kilometre',
                :cng_intensity => 0.03175.gallons_per_mile.to(:litres_per_kilometre),
                :cng_intensity_units => 'litres_per_kilometre',
                :lng_intensity => 0.00419.gallons_per_mile.to(:litres_per_kilometre),
                :lng_intensity_units => 'litres_per_kilometre',
                :lpg_intensity => 0.00037.gallons_per_mile.to(:litres_per_kilometre),
                :lpg_intensity_units => 'litres_per_kilometre',
                :methanol_intensity => 0.00021.gallons_per_mile.to(:litres_per_kilometre),
                :methanol_intensity_units => 'litres_per_kilometre',
                :biodiesel_intensity => 0.00979.gallons_per_mile.to(:litres_per_kilometre),
                :biodiesel_intensity_units => 'litres_per_kilometre',
                :electricity_intensity => 0.00001804 / 1.miles.to(:kilometres),
                :electricity_intensity_units => 'kilowatt_hours_per_kilometre',
                :air_conditioning_emission_factor => 0.04779 / 1.miles.to(:kilometres),
                :air_conditioning_emission_factor_units => 'kilograms_co2e_per_kilometre'
  
  col :name
  col :distance, :type => :float
  col :distance_units
  col :passengers, :type => :float
  col :speed, :type => :float
  col :speed_units
  col :gasoline_intensity, :type => :float
  col :gasoline_intensity_units
  col :diesel_intensity, :type => :float
  col :diesel_intensity_units
  col :cng_intensity, :type => :float
  col :cng_intensity_units
  col :lng_intensity, :type => :float
  col :lng_intensity_units
  col :lpg_intensity, :type => :float
  col :lpg_intensity_units
  col :methanol_intensity, :type => :float
  col :methanol_intensity_units
  col :biodiesel_intensity, :type => :float
  col :biodiesel_intensity_units
  col :electricity_intensity, :type => :float
  col :electricity_intensity_units
  col :air_conditioning_emission_factor, :type => :float
  col :air_conditioning_emission_factor_units
end