Module: BrighterPlanet::Purchase::CarbonModel

Defined in:
lib/purchase/carbon_model.rb

Class Method Summary collapse

Class Method Details

.included(base) ⇒ Object 



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# File 'lib/purchase/carbon_model.rb', line 13

def self.included(base)
  base.extend ::Leap::Subject
  base.extend FastTimestamp

  base.decide :emission, :with => :characteristics do
    committee :emission do
      quorum 'from impacts', :needs => :impacts do |characteristics|
        characteristics[:impacts].to_a.sum
      end
    end

    committee :impacts do
      quorum 'from economic flows and impact vectors', :needs => [:economic_flows, :impact_vectors] do |characteristics|
        characteristics[:impact_vectors] * characteristics[:economic_flows]
      end
    end

    committee :impact_vectors do
      quorum 'from database' do
        adapter = BrighterPlanet::Purchase.impact_vectors_adapter
        adapter.matrix
      end
    end

    committee :economic_flows do
      quorum 'from sector shares, a', :needs => [:sector_shares, :sector_direct_requirements] do |characteristics|
        y = characteristics[:sector_shares]
        leonteif_inverse = characteristics[:sector_direct_requirements]
        leonteif_inverse * y
      end
    end

    committee :sector_direct_requirements do
      quorum 'from database' do
        adapter = BrighterPlanet::Purchase.sector_direct_requirements_adapter
        adapter.matrix
      end
    end
    
    committee :sector_shares do
      quorum 'from industry sector shares', :needs => :industry_sector_shares do |characteristics|
        shares = BrighterPlanet::Purchase.key_map.map do |key|
          characteristics[:industry_sector_shares][key] || 0
        end
        Vector[*shares]
      end
    end

    committee :industry_sector_shares do
      quorum 'from industry sector ratios', :needs => [:industry_sector_ratios, :adjusted_cost] do |characteristics|
        characteristics[:industry_sector_ratios].inject({}) do |new_ratios, (io_code, ratio)|
          new_ratios[io_code] ||= 0
          new_ratios[io_code] += ratio * characteristics[:adjusted_cost]
          new_ratios
        end
      end
    end

    committee :industry_sector_ratios do
      quorum 'from industry ratios', :needs => :industry_ratios do |characteristics|
        naics_codes = characteristics[:industry_ratios].keys
        industry_sectors = IndustrySector.where(:naics_code => naics_codes)
        characteristics[:industry_ratios].inject({}) do |new_ratios, (naics_code, ratio)|
          industry_sectors.
            find_all { |i| i.naics_code == naics_code }.
            each do |industry_sector|
            new_ratios[industry_sector.io_code] ||= 0
            new_ratio = ratio * industry_sector.ratio
            new_ratios[industry_sector.io_code] += new_ratio
          end
          new_ratios
        end
      end
    end

    # industries = the industries needed to produce the purchased item
    # ratios = the portion of the purchase amount that goes to each industry
    committee :industry_ratios do
      quorum 'from non trade industry and industry product ratios', :needs => [:non_trade_industry_ratios, :industry_product_ratios] do |characteristics|
        combined_ratios = characteristics[:non_trade_industry_ratios].
          merge(characteristics[:industry_product_ratios]) do |key, non_trade, ip_ratio|
            non_trade + ip_ratio
          end
      end
    end

    committee :industry_product_ratios do
      quorum 'from product line industry product ratios', :needs => :product_line_industry_product_ratios do |characteristics|
        naics_product_codes = characteristics[:product_line_industry_product_ratios].keys
        industry_products = IndustryProduct.where(:naics_product_code => naics_product_codes)
        characteristics[:product_line_industry_product_ratios].inject({}) do |new_ratios, (naics_product_code, ratio)|
          industry_products.
            find_all { |i| i.naics_product_code == naics_product_code }.
            each do |industry_product|
            new_ratios[industry_product.naics_code] ||= 0
            new_ratios[industry_product.naics_code] += ratio
          end
          new_ratios
        end
      end
    end

    committee :product_line_industry_product_ratios do
      quorum 'from product line ratios', :needs => :product_line_ratios do |characteristics|
        ps_codes = characteristics[:product_line_ratios].keys
        plips = ProductLineIndustryProduct.where(:ps_code => ps_codes)
        characteristics[:product_line_ratios].inject({}) do |new_ratios, (ps_code, ratio)|
          plips.find_all { |p| p.ps_code == ps_code }.each do |plip|
            new_ratios[plip.naics_product_code] ||= 0
            new_ratio = ratio * plip.ratio
            new_ratios[plip.naics_product_code] += new_ratio
          end
          new_ratios
        end
      end
    end

    committee :product_line_ratios do
      quorum 'from trade industry ratios', :needs => :trade_industry_ratios do |characteristics|
        naics_codes = characteristics[:trade_industry_ratios].keys
        industry_product_lines = IndustryProductLine.where(:naics_code => naics_codes)
        characteristics[:trade_industry_ratios].inject({}) do |new_ratios, (naics, ratio)|
          industry_product_lines.
            find_all { |i| i.naics_code == naics}.
            each do |industry_product_line|
            new_ratios[industry_product_line.ps_code] ||= 0
            new_ratio = ratio * industry_product_line.ratio
            new_ratios[industry_product_line.ps_code] += new_ratio
          end
          new_ratios
        end
      end
    end

    committee :non_trade_industry_ratios do
      quorum 'from industry', :needs => :industry do |characteristics|
        if characteristics[:industry].trade_industry?
          {}
        else
          { characteristics[:industry].naics_code.to_s => 1 }
        end
      end

      quorum 'from merchant category industries', :needs => :merchant_category_industries do |characteristics|
        characteristics[:merchant_category_industries].
          reject { |mci| mci.industry.trade_industry? }.inject({}) do |ntir, merchant_category_industry|
            ntir[merchant_category_industry.naics_code] ||= 0
            ntir[merchant_category_industry.naics_code] += merchant_category_industry.ratio
            ntir
        end
      end
      
      # NAICS 339991 chosen because it's emissions intensity is close to the average of the entire U.S. economy
      # (calculated by multiplying each sector's emissions intensity by it's share of total 2002 value)
      quorum 'default' do
        { '339991' => 1 }
      end
    end

    committee :trade_industry_ratios do
      quorum 'from industry', :needs => :industry do |characteristics|
        if characteristics[:industry].trade_industry?
          { characteristics[:industry].naics_code.to_s => 1 }
        else
          {}
        end
      end

      quorum 'from merchant category industries', :needs => :merchant_category_industries do |characteristics|
        characteristics[:merchant_category_industries].
          select { |mci| mci.industry.trade_industry? }.inject({}) do |tir, merchant_category_industry|
            tir[merchant_category_industry.naics_code] ||= 0
            tir[merchant_category_industry.naics_code] += merchant_category_industry.ratio
            tir
        end
      end
      
      quorum 'default' do
        {}
      end
    end

    # a dictionary to go from merchant categories to industries
    committee :merchant_category_industries do
      quorum 'from merchant category', :needs => :merchant_category do |characteristics|
        characteristics[:merchant_category].merchant_category_industries
      end
    end

    committee :merchant_category do
      quorum 'from merchant', :needs => [:merchant] do |characteristics|
        characteristics[:merchant].merchant_category
      end
    end
    
    committee :adjusted_cost do
      quorum 'from cost and date', :needs => [:cost, :date] do |characteristics|
        # FIXME TODO: Import CPI conversions
        @cpi_lookup ||= { 
          2009 => 1.189, 2010 => 1.207, 2011 => 1.225, 2012 => 1.245, 
          2013 => 1.265 }

        date = characteristics[:date]
        date = date.is_a?(String) ? Date.parse(date) : date
        conversion_factor = @cpi_lookup[date.year] || 1.207

        characteristics[:cost].to_f / conversion_factor
      end
      
      # This is the average federal government purchase card transaction in 2003, converted to 2002 dollars, with tax taken out
      # See http://www.sba.gov/advo/research/rs226tot.pdf
      quorum 'default' do
        517
      end
    end
      
    committee :cost do
      quorum 'from purchase amount and tax', :needs => [:purchase_amount, :tax] do |characteristics|
        characteristics[:purchase_amount].to_f - characteristics[:tax].to_f
      end
      
      # Based on http://www.thestc.com/STrates.stm weighted by US Census 2010 projected state population (exclude samoa, guam, pr)
      quorum 'from purchase amount', :needs => :purchase_amount do |characteristics|
        characteristics[:purchase_amount].to_f / 1.0711
      end
    end

    committee :date do
      quorum 'default' do
        Date.today
      end
    end
  end
end