Module: BrighterPlanet::Diet::CarbonModel

Defined in:
lib/diet/carbon_model.rb

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/diet/carbon_model.rb', line 8

def self.included(base)
  base.decide :emission, :with => :characteristics do
    committee :emission do # returns kg CO2
      quorum 'from intensity and size', :needs => [:intensity, :size, :active_subtimeframe] do |characteristics|
        #( grams CO2 / kcal food   ) * (   kcal food         )
        (characteristics[:intensity] * characteristics[:size]).grams.to(:kilograms) * characteristics[:active_subtimeframe].days
      end
      quorum 'default' do
        raise 'Diet emission committee default quorum should never be called'
      end
    end

    committee :intensity do # returns grams CO2 / kcal food
      quorum 'from food groups', :needs => [:red_meat_share, :poultry_share, :fish_share, :eggs_share, :nuts_share, :dairy_share, :cereals_and_grains_share, :fruit_share, :vegetables_share, :oils_and_sugars_share] do |characteristics|
        [:red_meat, :poultry, :fish, :eggs, :nuts, :dairy, :cereals_and_grains, :fruit, :vegetables, :oils_and_sugars].sum do |group|
          characteristics["#{group}_share".to_sym].to_f * FoodGroup[group].intensity.to_f
        end
      end

      quorum 'from diet class', :needs => :diet_class do |characteristics|
        characteristics[:diet_class].intensity
      end
    end

    committee :size do # returns kcal food
      quorum 'default' do
        base.fallback.size
      end
    end

    committee :diet_class do
      quorum 'default' do
        DietClass.fallback
      end
    end

    committee :active_subtimeframe do
      quorum 'from start and end dates', :needs => [:start_date, :end_date] do |characteristics, timeframe|
        Timeframe.constrained_new characteristics[:start_date], characteristics[:end_date], timeframe
      end
    end
    
    committee :start_date do
      quorum 'from end date', :appreciates => :end_date do |characteristics, timeframe|
        [ timeframe.from, characteristics[:end_date] ].compact.min
      end
    end
    
    committee :end_date do
      quorum 'from start date', :appreciates => :start_date do |characteristics, timeframe|
        [ timeframe.to, characteristics[:start_date] ].compact.max
      end
    end
  end
end