/// url = 'https://fhir.slade360.co.ke/fhir/StructureMap/ExtractMortuaryAdmission'
/// name = 'ExtractMortuaryAdmission'
/// title = 'Mortuary Admission Extraction'
/// status = 'active'
/// description = 'A Composition for the admission, with the registration tag number as its identifier -- that tag is the mortuary\'s own handle and in practice the only thing that reliably links a body to its paperwork. Where the body came from and the cause of death extract as Observations, for the same reason as on the services request: whether the deceased was ever a patient here has to be answerable from the data.'

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

group ExtractMortuaryAdmission(source qr : QR, target bundle : Bundle) {
  qr -> bundle.type = 'transaction' "setBundleType";
  qr ->  bundle.entry as entry,  entry.resource = create('Composition') as comp then {
    qr ->  comp,  entry then BuildCompositionBase(qr, comp, entry) "base";
    qr -> comp.status = 'final' "status";
    qr -> comp.title = 'Mortuary admission' "title";
    qr.authored as t -> comp.date = t "date";
    qr.source as src -> comp.author = src "author";
    qr -> comp.type as tp then {
      qr -> tp.coding as cg then {
        qr -> cg.system = 'https://fhir.slade360.co.ke/fhir/CodeSystem/document-type-codesystem' "sys";
        qr -> cg.code = 'mortuary-admission' "cd";
        qr -> cg.display = 'Mortuary admission form' "dsp";
      } "coding";
    } "type";
    // R5 removed Composition.confidentiality; the label lives in
    // Resource.meta.security. Restricted rather than normal, deliberately: for
    // a death review and for the mortuary set, whether the record belongs in
    // the patient's clinical file at all is an open policy question, and the
    // safe direction to be wrong in is the more protective one.
    qr ->  comp.meta as m,  m.security as sec then {
      qr -> sec.system = 'http://terminology.hl7.org/CodeSystem/v3-Confidentiality' "sys";
      qr -> sec.code = 'R' "cd";
      qr -> sec.display = 'restricted' "dsp";
    } "confidentiality";
    qr.item as g where (linkId = 'admission') then {
      g.item as it where ((linkId = 'admission/registration-tag-number') and answer.value.exists()) then {
        it.answer first as a then {
          a.value as txt -> comp.identifier as ident then {
            txt -> ident.system = 'https://fhir.slade360.co.ke/fhir/identifier/mortuary-registration-tag' "identSystem";
            txt -> ident.value = txt "identValue";
          } "identifier";
        };
      } "tagRule";
      g.item as it where ((linkId = 'admission/at') and answer.value.exists()) then {
        it.answer first as a then {
          a.value as v ->  comp.event as ev,  ev.period as per,  per.start = v "eventStart";
        };
      } "admittedRule";
      g.item as it where ((linkId = 'admission/received-by') and answer.value.exists()) then {
        it.answer first as a then {
          a.value as txt -> comp.attester as att then {
            txt ->  att.mode as am,  am.text = 'Person receiving the body into the mortuary' "mode";
            txt ->  att.party = create('Reference') as pref,  pref.display = txt "party";
          } "attester";
        };
      } "receivedByRule";
      g.item as it where ((linkId = 'admission/vehicle-registration') and answer.value.exists()) then {
        it.answer first as a then {
          a.value as txt ->  comp.note as n,  n.text = txt "vehicleNote";
        };
      } "vehicleRule";
    } "admissionGroup";
    qr.item as it where (linkId = 'deceased') then {
      it.item as cd where ((linkId = 'deceased/cause-of-death') and answer.value.exists()) -> comp.section as sec then {
        cd -> sec.title = 'Cause of death' "title";
        cd -> sec.code as sc then {
          cd -> sc.coding as cg then {
            cd -> cg.system = 'http://loinc.org' "sys";
            cd -> cg.code = '69453-9' "cd";
            cd -> cg.display = 'Cause of death [US Standard Certificate of Death]' "dsp";
          } "coding";
        } "code";
        cd ->  bundle.entry as sentry,  sentry.resource = create('Observation') as sobs then {
          qr ->  sobs,  sentry then BuildObsBase(qr, sobs, sentry) "base";
          qr -> sobs then SetSurveyCategory(qr, sobs) "category";
          cd -> sobs.code as scc then {
            cd -> scc.coding as scg then {
              cd -> scg.system = 'http://loinc.org' "sys";
              cd -> scg.code = '69453-9' "cd";
              cd -> scg.display = 'Cause of death [US Standard Certificate of Death]' "dsp";
            } "coding";
          } "code";
          cd.answer first as a then {
            a.value as txt ->  sobs.note as n,  n.text = txt "text";
          };
          cd ->  sec.entry = create('Reference') as sref,  sref.reference = reference(sobs) "linkEntry";
        } "causeObservation";
      } "causeSection";
    } "deceasedGroup";
  } "mortuaryAdmissionComposition";
  qr.item as g where (linkId = 'admission') then {
    g.item as it where ((linkId = 'admission/source') and answer.value.exists()) ->  bundle.entry as entry,  entry.resource = create('Observation') as obs then {
      qr ->  obs,  entry then BuildObsBase(qr, obs, entry) "base";
      qr -> obs then SetSurveyCategory(qr, obs) "category";
      it -> obs.code as cc then {
        it -> cc.coding as cg then {
          it -> cg.system = 'https://fhir.slade360.co.ke/fhir/CodeSystem/concept-codesystem' "sys";
          it -> cg.code = 'mortuary-source-where-the-body-came-from' "cd";
          it -> cg.display = 'Where the body came from' "dsp";
        } "coding";
      } "code";
      it.answer first as a then {
        a.value as cv -> obs.value = create('CodeableConcept') as cc then {
          cv -> cc.coding = cv "valueCoding";
          cv.display as d -> cc.text = d "valueText";
        } "codedValue";
      };
      it ->  obs.note as n,  n.text = 'Coded rather than free text: this is the field that decides whether the deceased was a patient of this hospital at all.' "note";
    } "coded_mortuary_source";
  } "sourceGroup";
  qr.item as g where (linkId = 'deceased') then {
    g.item as it where ((linkId = 'deceased/place-of-death') and answer.value.exists()) ->  bundle.entry as entry,  entry.resource = create('Observation') as obs then {
      qr ->  obs,  entry then BuildObsBase(qr, obs, entry) "base";
      qr -> obs then SetSurveyCategory(qr, obs) "category";
      it -> obs.code as cc then {
        it -> cc.coding as cg then {
          it -> cg.system = 'https://fhir.slade360.co.ke/fhir/CodeSystem/concept-codesystem' "sys";
          it -> cg.code = 'mortuary-source-place-of-death' "cd";
          it -> cg.display = 'Place of death' "dsp";
        } "coding";
      } "code";
      it.answer first as a then {
        a.value as txt ->  obs.note as n,  n.text = txt "text";
      };
    } "narr_mortuary_source_place_of_death";
  } "placeGroup";
}

// ─────────────────────────────────────────────────────────────────────────────
// Shared scaffolding. Repeated in each map rather than imported: the transform
// engine resolves `imports` against whatever StructureMaps happen to be on the
// server, and a form that stops extracting because a shared map was not
// uploaded is a worse failure than a duplicated group.
// Two notes on what the publisher's StructureMap validator says about this file.
// Source parameters below are left untyped on purpose. Writing `: Element` makes
// the validator compare QuestionnaireResponse.item against the literal 'Element'
// and report them as incompatible with each other, which is noise, not a finding.
// `evaluate(context, expression)` is flagged as "takes 1 parameter but 2 were
// found". Leave it. The FML parser in the same jar refuses the one-argument form
// outright -- it wants a parameter, a comma, then the FHIRPath -- so the
// publisher is objecting to what its own compiler emits. Two arguments is the
// only form that compiles, and it is what the R5 transform engine executes.
// ─────────────────────────────────────────────────────────────────────────────
group BuildObsBase(source qr : QR, target obs : Observation, target entry) {
  qr -> obs then SetResponseProvenance(qr, obs) "responseProvenance";
  qr -> obs.id = uuid() then SetObservationFullUrl(obs, entry) "idAndFullUrl";
  qr -> entry.request as request then {
    qr -> request.method = 'POST' "requestMethod";
    qr -> request.url = 'Observation' "requestUrl";
  } "entryRequest";
  qr -> obs.status = 'final' "status";
  qr.subject as s -> obs.subject = s;
  qr.encounter as e -> obs.encounter = e;
  qr.authored as t -> obs.effective = t "effective";
  qr.source as src -> obs.performer = src "performerFromSource";
  qr where (source.exists().not()) then {
    qr.author as a -> obs.performer = a "performerFromAuthor";
  } "performerFallback";
  // A stored response's id already reads "QuestionnaireResponse/<id>", so it is
  // a relative reference as it stands. The hasValue() guard is what stops an
  // unsaved response -- one posted straight to $extract rather than saved first
  // -- from writing "QuestionnaireResponse/null" into the record.
  qr.id as qid where ($this.hasValue()) ->  obs.derivedFrom = create('Reference') as ref,  ref.reference = qid "linkQuestionnaireResponse";
}

group SetObservationFullUrl(source obs : Observation, target entry) {
  obs.id as id -> entry.fullUrl = append('https://fhir.slade360.co.ke/fhir/Observation/', id) "assignFullUrl";
}

// The two answer shapes a component can carry. Both read the answer through the
// untyped `.value` accessor: reading `valueCoding` or `valueQuantity` by its
// typed property name fails at transform time on HAPI R5 with "Attempt to read
// invalid property ... on QuestionnaireResponse.item.answer".
group SetComponentCodedValue(source it, target comp) {
  it.answer first as a then {
    a.value as cv -> comp.value = create('CodeableConcept') as cc then {
      cv -> cc.coding = cv "valueCoding";
      cv.display as d -> cc.text = d "valueText";
    } "codedValue";
  } "componentAnswer";
}

group SetComponentValue(source it, target comp) {
  it.answer first as a then {
    a.value as v -> comp.value = v "plainValue";
  } "componentAnswer";
}

group SetSurveyCategory(source qr : QR, target obs : Observation) {
  qr -> obs.category as cat then {
    qr -> cat.coding as coding then {
      qr -> coding.system = 'http://terminology.hl7.org/CodeSystem/observation-category' "categorySystem";
      qr -> coding.code = 'survey' "categoryCode";
      qr -> coding.display = 'Survey' "categoryDisplay";
    } "categoryCoding";
  } "category";
}

group BuildCompositionBase(source qr : QR, target r : Composition, target entry) {
  qr -> r then SetResponseProvenance(qr, r) "responseProvenance";
  qr -> r.id = uuid() then SetCompositionFullUrl(r, entry) "idAndFullUrl";
  qr -> entry.request as request then {
    qr -> request.method = 'POST' "requestMethod";
    qr -> request.url = 'Composition' "requestUrl";
  } "entryRequest";
  qr.subject as s -> r.subject = s;
}

group SetCompositionFullUrl(source r : Composition, target entry) {
  r.id as id -> entry.fullUrl = append('https://fhir.slade360.co.ke/fhir/Composition/', id) "assignFullUrl";
}

// ── Provenance and tenancy ───────────────────────────────────────────────────
// Two tags on everything this map creates. The first says which questionnaire
// produced it, so a form that reopens mid-admission recalls its own earlier
// entries and not another form's. The second copies the tenant tags off the
// response, because nothing else on the path puts them there.
// The code is the form's document type, not the questionnaire's id: every
// environment mints its own ids, and there is only one set of maps, so an id
// here would tie the tag to whichever environment stamped it.
// ── Provenance and tenancy ───────────────────────────────────────────────────
group SetResponseProvenance(source qr : QR, target r) {
  qr -> r.meta as m then {
    qr -> m.tag as t then {
      qr -> t.system = 'http://slade360edi.com/questionnaire-provenance' "provenanceSystem";
      qr -> t.code = 'mortuary-admission' "provenanceCode";
      qr -> t.display = 'Mortuary admission form' "provenanceDisplay";
    } "provenanceTag";
  } "provenanceMeta";
  // Every tag the response carries, onto the resource. `meta` is 0..1, so this
  // lands on the same meta the rule above created rather than a second one.
  qr.meta as qm then {
    qm.tag as qt ->  r.meta as m,  m.tag = qt "copyTag";
  } "tenantTags";
}