module Qrda
  module Export
    module Helper
      module DateHelper
        def value_or_null_flavor(time)
          # this is a bit of a hack for a defineded undefined date
          if time && DateTime.parse(time).year < 3000
            "value='#{DateTime.parse(time).utc.to_formatted_s(:number)}'"
          else
            "nullFlavor='UNK'"
          end
        end

        def performance_period_start
          @performance_period_start.to_formatted_s(:number)
        end

        def performance_period_end
          @performance_period_end.to_formatted_s(:number)
        end

        def current_time
          Time.now.utc.to_formatted_s(:number)
        end

        def sent_date_time
          "<low #{value_or_null_flavor(self['sentDatetime'])}/>"
        end

        def received_date_time
          "<high #{value_or_null_flavor(self['receivedDatetime'])}/>"
        end

        def active_date_time
          "<effectiveTime #{value_or_null_flavor(self['activeDatetime'])}/>"
        end

        def author_time
          "<time #{value_or_null_flavor(self['authorDatetime'])}/>"
        end

        def author_effective_time
          "<effectiveTime #{value_or_null_flavor(self['authorDatetime'])}/>"
        end

        def birth_date_time
          "<birthTime #{value_or_null_flavor(self['birthDatetime'])}/>"
        end

        def result_date_time?
          !self['resultDatetime'].nil?
        end

        def result_date_time
          "<effectiveTime #{value_or_null_flavor(self['resultDatetime'])}/>"
        end

        def expired_date_time
          "<effectiveTime>"\
          "<low #{value_or_null_flavor(self['expiredDatetime'])}/>"\
          "</effectiveTime>"
        end

        def medication_supply_request_period
          "<effectiveTime xsi:type='IVL_TS'>"\
          "<low #{value_or_null_flavor(self['relevantPeriod']['low'])}/>"\
          "<high #{value_or_null_flavor(self['relevantPeriod']['high'])}/>"\
          "</effectiveTime>"
        end

        def medication_duration_author_effective_time
          "<effectiveTime xsi:type='IVL_TS'>"\
          "<low #{value_or_null_flavor(self['authorDatetime'])}/>"\
          "<high nullFlavor='UNK'/>"\
          "</effectiveTime>"
        end

        def prevalence_period
          "<effectiveTime>"\
          "<low #{value_or_null_flavor(self['prevalencePeriod']['low'])}/>"\
          "<high #{value_or_null_flavor(self['prevalencePeriod']['high'])}/>"\
          "</effectiveTime>"
        end

        def relevant_period
          "<effectiveTime>"\
          "<low #{value_or_null_flavor(self['relevantPeriod']['low'])}/>"\
          "<high #{value_or_null_flavor(self['relevantPeriod']['high'])}/>"\
          "</effectiveTime>"
        end

        def participation_period
          "<effectiveTime>"\
          "<low #{value_or_null_flavor(self['participationPeriod']['low'])}/>"\
          "<high #{value_or_null_flavor(self['participationPeriod']['high'])}/>"\
          "</effectiveTime>"
        end

        def relevant_period_as_value
          "<effectiveTime #{value_or_null_flavor(self['relevantPeriod']['low'])}/>"
        end

        def relevant_date_time_low
          "<effectiveTime>"\
          "<low #{value_or_null_flavor(self['relevantDatetime'])}/>"\
          "</effectiveTime>"
        end

        def relevant_date_time_value
          "<effectiveTime #{value_or_null_flavor(self['relevantDatetime'])}/>"
        end

        def medication_duration_effective_time
          "<effectiveTime xsi:type=\"IVL_TS\">"\
          "<low #{value_or_null_flavor(self['relevantPeriod']['low'])}/>"\
          "<high #{value_or_null_flavor(self['relevantPeriod']['high'])}/>"\
          "</effectiveTime>"
        end

        def facility_period
          "<low #{value_or_null_flavor(self['locationPeriod']['low'])}/>"\
          "<high #{value_or_null_flavor(self['locationPeriod']['high'])}/>"
        end

        def incision_datetime
          "<effectiveTime #{value_or_null_flavor(self['incisionDatetime'])}/>"
        end

        def completed_prevalence_period
          self['prevalencePeriod']['high'] ? true : false
        end
      end
    end
  end
end