module Scrivito

  # Adds support for string columns which contain ISO dates
  module DateAttribute
    def self.deserialize_from_backend(iso_date_time)
      return nil unless iso_date_time

      if iso_date_time.to_s =~ /^(\d{4})(\d{2})(\d{2})(\d{2})(\d{2})(\d{2})$/
        Time.utc($1.to_i, $2.to_i, $3.to_i, $4.to_i, $5.to_i, $6.to_i).in_time_zone
      else
        raise "The value is not a valid ISO date time: #{iso_date_time.inspect}"
      end
    end

    def self.deserialize_from_client(iso8601_date_time)
      return unless iso8601_date_time

      DateTime.iso8601(iso8601_date_time).in_time_zone
    rescue ArgumentError
      raise "The value is not a valid ISO 8601 date time: #{iso8601_date_time.inspect}"
    end

    def self.serialize_for_backend(attribute_value)
      attribute_value = case attribute_value
        when Date then attribute_value.to_time
        when Time then attribute_value.to_time.utc
        end
      attribute_value.strftime('%Y%m%d%H%M%S') if attribute_value
    end

    def self.serialize_for_client(attribute_value)
      attribute_value.utc.iso8601
    end
  end

end