module Canql
  grammar Patient
    rule gender
      space gender:('male' / 'female') word_break <Nodes::Patient::GenderNode>
    end

    rule outcome
      space outcome:('stillborn' / 'liveborn' / 'miscarried' / 'terminated' / 'registrable' / 'non-registrable' ) word_break <Nodes::Patient::OutcomeNode>
    end

    rule primacy
      space primacy:('primary' / 'alias' ) word_break <Nodes::Patient::PrimacyNode>
    end

    rule category
      space category:('eurocat amber and green' / 'eurocat red and amber' / 'eurocat red' / 'eurocat amber' / 'eurocat green' / 'eurocat') word_break <Nodes::Patient::CategoryNode>
    end

    rule expected_keyword
      space ('expected' / 'due') word_break
    end

    rule expected
      expected_keyword fuzzy_date <Nodes::Patient::ExpectedDateRangeNode>
    end

    rule case_field_existance
      and_keyword? field_existance_modifier:existance_keyword patient_field_list:case_field_list  <Nodes::Patient::FieldExists>
    end

    rule patient_field_existance
      and_keyword? field_existance_modifier:existance_keyword patient_field_list:patient_field_list  <Nodes::Patient::FieldExists>
    end

    rule patient_fields_keyword
      space 'field' 's'? word_break
    end

    rule case_field_list
      space case_field_names (comma case_field_names)*
    end

    rule patient_field_list
      space patient_field_names (comma patient_field_names)*
    end

    rule case_field_names
      patient_field_name:(
        'date of birth' / 'dob' / 'nhs number' / 'delivery postcode' /
        'booking postcode' / 'birth weight' /
        'place of delivery' / 'sex' / 'outcome' / 'edd' /
        'expected delivery date' / 'booking hospital' / 'screening status'
      )
    end

    rule patient_field_names
      patient_field_name:(
        'date of birth' / 'dob' / 'nhs number' / 'sex'
      )
    end

    rule mother_conditions
      and_keyword? space subject:'mother' word_break mother_additional_conditions mother_with_clause?
    end

    rule mother_additional_conditions
      mother_age_conditions*
    end

    rule mother_age_conditions
      and_keyword? (with_birth_date / with_death_date)
    end

    rule mother_with_clause
      with_keyword? post:mother_with_conditions+
    end

    rule mother_with_conditions
      patient_field_existance / action_or_ebr
    end
  end
end