/// url = 'https://fhir.slade360.co.ke/fhir/StructureMap/ExtractMortuaryBabyDisposalConsent'
/// name = 'ExtractMortuaryBabyDisposalConsent'
/// title = 'Mortuary Baby Disposal Consent Extraction'
/// status = 'active'
/// description = 'A Consent, recorded in both directions: decision \'permit\' where disposal was authorised and \'deny\' where it was refused. A refusal is a fact the record has to carry, not an absence -- an absent consent and a declined one look identical unless the form says which, and the two have entirely different consequences for what the mortuary may do next.'

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/Consent" alias Consent as target

group ExtractMortuaryBabyDisposalConsent(source qr : QR, target bundle : Bundle) {
  qr -> bundle.type = 'transaction' "setBundleType";
  qr.item as g where (linkId = 'authorisation') then {
    g.item as it where ((linkId = 'authorisation/given') and answer.value.exists()) ->  bundle.entry as entry,  entry.resource = create('Consent') as con then {
      qr ->  con,  entry then BuildConsentBase(qr, con, entry) "base";
      it -> con.status = 'active' "status";
      it -> con.category as cat then {
        it -> cat.coding as cg then {
          it -> cg.system = 'http://loinc.org' "sys";
          it -> cg.code = '64293-4' "cd";
          it -> cg.display = 'Procedure consent Document' "dsp";
        } "coding";
        it -> cat.text = 'Authorisation for the hospital to dispose of a baby' "catText";
      } "category";
      it.answer first as a then {
        a.value as cv where (code = 'Y') -> con.decision = 'permit' "permit";
      } "permitRule";
      it.answer first as a then {
        a.value as cv where (code = 'N') -> con.decision = 'deny' "deny";
      } "denyRule";
      // The signing time to period.start. Consent.date is a `date` and this
      // form asks for a date and a time; cast() refuses to drop the seconds.
      g.item as at where ((linkId = 'authorisation/at') and answer.value.exists()) then {
        at.answer first as a then {
          a.value as v ->  con.period as per,  per.start = v "periodStart";
        };
      } "signedAtRule";
      qr where (item.where(linkId = 'authorisation').item.where(linkId = 'authorisation/at').answer.value.exists().not()) then {
        qr.authored as t ->  con.period as per,  per.start = t "periodStartFallback";
      } "signedAtFallback";
      it -> con.provision as prov then {
        it -> prov.code as pc then {
          // A local code. tx.fhir.org will not text-search the SNOMED
          // implicit value set, so a SNOMED code for disposal of a body can
          // only be confirmed by $lookup if you already know it -- and every
          // candidate tried came back not found. A guessed SNOMED code is
          // worse than a local one that says what the form says.
          it -> pc.coding as cg then {
            it -> cg.system = 'https://fhir.slade360.co.ke/fhir/CodeSystem/concept-codesystem' "sys";
            it -> cg.code = 'mortuary-disposal-of-a-body' "cd";
            it -> cg.display = 'Disposal of a body' "dsp";
          } "coding";
          it -> pc.text = 'Disposal of the baby by the hospital' "provText";
        } "provCode";
      } "provision";
      qr.item as cg2 where (linkId = 'consenter') then {
        cg2.item as n where ((linkId = 'consenter/name') and answer.value.exists()) then {
          n.answer first as a then {
            a.value as txt ->  con.grantor = create('Reference') as gref,  gref.display = txt "grantor";
          };
        } "consenterNameRule";
        cg2.item as r where ((linkId = 'consenter/relationship') and answer.value.exists()) then {
          r.answer first as a then {
            a.value as txt ->  con.provision as prov,  prov.code as pc,  pc.text = txt "relationshipText";
          };
        } "relationshipRule";
      } "consenterGroup";
      g.item as no where ((linkId = 'authorisation/nursing-officer') and answer.value.exists()) then {
        no.answer first as a then {
          a.value as txt -> con.verification as ver then {
            txt -> ver.verified = true "verified";
            txt ->  ver.verifiedBy = create('Reference') as vref,  vref.display = txt "verifiedBy";
          } "verification";
        };
      } "nursingOfficerRule";
    } "disposalConsent";
  } "authorisationGroup";
  // The baby's own details, as an Observation. The nature of birth is the one
  // clinical fact on this form and it is the one a later audit of stillbirths
  // and early neonatal deaths would actually query.
  qr.item as g where ((linkId = 'baby') and item.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";
    g -> obs.code as cc then {
      g -> cc.coding as cg then {
        g -> cg.system = 'https://fhir.slade360.co.ke/fhir/CodeSystem/concept-codesystem' "sys";
        g -> cg.code = 'cord-nature-of-birth' "cd";
        g -> cg.display = 'Nature of birth' "dsp";
      } "coding";
    } "code";
    g.item as it where ((linkId = 'baby/nature-of-birth') and answer.value.exists()) -> obs.component as comp then {
      it -> comp.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 = 'cord-mode-of-delivery' "cd";
          it -> cg.display = 'Mode of delivery' "dsp";
        } "coding";
      } "code";
      it -> comp then SetComponentCodedValue(it, comp) "value";
    } "comp_cord_mode_of_delivery";
    g.item as it where ((linkId = 'baby/place-of-birth') and answer.value.exists()) -> obs.component as comp then {
      it -> comp.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 = 'cord-place-of-birth' "cd";
          it -> cg.display = 'Place of birth' "dsp";
        } "coding";
      } "code";
      it -> comp then SetComponentValue(it, comp) "value";
    } "comp_cord_place_of_birth";
  } "babyObservation";
}

// ─────────────────────────────────────────────────────────────────────────────
// 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 BuildConsentBase(source qr : QR, target r : Consent, target entry) {
  qr -> r then SetResponseProvenance(qr, r) "responseProvenance";
  qr -> r.id = uuid() then SetConsentFullUrl(r, entry) "idAndFullUrl";
  qr -> entry.request as request then {
    qr -> request.method = 'POST' "requestMethod";
    qr -> request.url = 'Consent' "requestUrl";
  } "entryRequest";
  qr.subject as s -> r.subject = s;
}

group SetConsentFullUrl(source r : Consent, target entry) {
  r.id as id -> entry.fullUrl = append('https://fhir.slade360.co.ke/fhir/Consent/', 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-baby-disposal-consent' "provenanceCode";
      qr -> t.display = 'Mortuary consent form, disposal of a baby' "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";
}