require 'active_record'
require 'danconia/stores/active_record'

module Danconia
  module Integrations
    module ActiveRecord
      def self.included(base)
        base.extend(ClassMethods)
      end

      module ClassMethods
        def money(*attr_names, **exchange_opts)
          attr_names.each do |attr_name|
            amount_column = attr_name
            currency_column = :"#{attr_name}_currency"

            define_method "#{attr_name}=" do |value|
              write_attribute amount_column, value.is_a?(Money) ? value.amount : value
              write_attribute currency_column, value.currency.code if respond_to?(currency_column) && value.is_a?(Money)
            end

            define_method attr_name do
              amount = read_attribute amount_column
              currency = read_attribute currency_column
              decimals = self.class.columns.detect { |c| c.name == amount_column.to_s }.scale
              Money.new amount, currency, decimals: decimals, exchange_opts: exchange_opts if amount
            end
          end
        end
      end
    end
  end
end

ActiveRecord::Base.send :include, Danconia::Integrations::ActiveRecord