fairmondo/fairmondo

#   Copyright (c) 2012-2017, Fairmondo eG.  This file is
#   licensed under the GNU Affero General Public License version 3 or later.
#   See the COPYRIGHT file for details.

class DonationAbacus
  attr_reader :donations, :donation_total, :donation_per_organisation

  def self.calculate line_item_group
    abacus = DonationAbacus.new(line_item_group)
    abacus.calculate_donations
    abacus
  end

  def calculate_donations
    add_donation_organisations_to_donations @line_item_group.business_transactions
    @donations.each_value { |v| @donation_total += v.sum }
    @donations.each_pair { |k, v| @donation_per_organisation[k] = v.sum }
  end

  private

  def initialize line_item_group
    @line_item_group = line_item_group
    @donations = {}
    @donation_total = Money.new(0)
    @donation_per_organisation = {}
  end

  def add_donation_organisations_to_donations business_transactions
    business_transactions.each do |bt|
      if bt.article.friendly_percent_organisation_id && bt.article.friendly_percent_organisation_id != 0
        organisation = User.find bt.article.friendly_percent_organisation_id
        @donations[organisation] = [] unless @donations[organisation]
        @donations[organisation] << Money.new(bt.article.calculated_friendly_cents * bt.quantity_bought)
      end
    end
  end
end