cirandas.net

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require_dependency 'products_plugin/product'

module ProductsPlugin
  class Product

    has_many :product_currencies, -> {
      includes(:currency).order('price IS NOT NULL, discount IS NOT NULL, id ASC')
    }, class_name: 'CurrencyPlugin::ProductCurrency'

    has_many :currencies, through: :product_currencies

    CurrencyFields = [:price, :discount]

    def available_currencies_for_price
      self.enterprise.currencies - self.currencies.with_price
    end
    def available_currencies_for_discount
      self.enterprise.currencies - self.currencies.with_discount
    end
    def available_currencies
      zip = CurrencyFields.zip CurrencyFields.map{ |field| self.send "available_currencies_for_#{field}" }
      Hash[zip]
    end

    def currencies= currencies
      ActiveRecord::Base.transaction do
        self.product_currencies.destroy_all
        currencies.each do |id, attrs|
          next unless attrs.values.select{ |v| v.empty? }.empty?
          self.product_currencies.create attrs.merge(currency_id: id)
        end
      end
    end

    alias_method :orig_price_with_discount, :price_with_discount
    def price_with_discount currency = nil
      return orig_price_with_discount unless currency
      currency.discount ? (currency.price - currency.discount) : currency.price
    end

  end
end