map "https://fhir.hl7.at/prenudge/appdata/r4/StructureMap/SittingHoursQuestionnaireResponseToObservation" = "SittingHoursQuestionnaireResponseToObservation"

// Sitting Hours EHIS-PAQ Q9 / ATHIS PE9 to O

uses "http://hl7.org/fhir/StructureDefinition/QuestionnaireResponse" alias QR as source
uses "http://hl7.org/fhir/StructureDefinition/Observation" alias Obs as target

imports "http://hl7.org/fhir/StructureMap/*"
imports "https://fhir.hl7.at/prenudge/appdata/r4/StructureMap/QuestionnaireResponseToObservationBase"

// ---------------------------------------------------------------------------
// Main entry group
// ---------------------------------------------------------------------------
group SittingHoursQuestionnaireResponseToObservation(source src : QR, target tgt : Obs) {
  // Shared base: identifier copy, derivedFrom, subject, issued, status, method.
  src then SetObservationBase(src, tgt) "Base";
  // Target profile
  src ->  tgt.meta = create('Meta') as meta,  meta.profile = 'https://fhir.hl7.at/prenudge/appdata/r4/StructureDefinition/at-prenudge-sitting-hours-observation' "SetProfile";
  // Observation code
  src -> tgt.code = cc('http://loinc.org', '87705-0', 'Sedentary activity 24 hour') "SetCode";
  // effectiveDateTime from authored (Q9 has no embedded date sub-item)
  src.authored as authored -> tgt.effectiveDateTime = authored "SetEffectiveDateTime";
  // Map Q9 group to Observation.value
  src.item as item where linkId = 'Q9' then MapQ9ToSittingHours(item, tgt) "ProcessQ9";
}

// ---------------------------------------------------------------------------
// Q9 → Observation.valueQuantity (h)
// Only Q9-hours (integer) is mapped to Observation.valueQuantity.value.
// Q9-minutes is not included because MaLaC-HD does not support evaluate()
// with complex FHIRPath expressions (arithmetic or multi-token paths).
// Sub-hour precision requires an engine that supports evaluate(), e.g. matchbox.
// ---------------------------------------------------------------------------
group MapQ9ToSittingHours(source src : QR, target tgt : Obs) {
  src.item as hoursItem where linkId = 'Q9-hours' then {
    hoursItem.answer as hoursAnswer then {
      hoursAnswer.valueInteger as hoursElem then {
        hoursElem.value as numVal ->  tgt.value = create('Quantity') as qty,  qty.value = numVal,  qty.unit = 'h',  qty.system = 'http://unitsofmeasure.org',  qty.code = 'h' "SetSittingQuantity";
      } "ExtractValue";
    } "ExtractHoursAnswer";
  } "ProcessHoursItem";
}