/// url = 'https://fhir.slade360.co.ke/fhir/StructureMap/ExtractBodyPartDisposalConsent'
/// name = 'ExtractBodyPartDisposalConsent'
/// title = 'Body Part Disposal Consent Extraction'
/// status = 'active'
/// description = 'A Consent whose provision is the disposition chosen -- released to the family, or disposed of by the hospital. Both are permissions, so the decision stays \'permit\' and the disposition rides in the provision rather than flipping the decision: refusing to let the hospital dispose of a part is not refusing the surgery, it is choosing the other option, and a Consent with decision \'deny\' would say the wrong thing entirely.'

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 ExtractBodyPartDisposalConsent(source qr : QR, target bundle : Bundle) {
  qr -> bundle.type = 'transaction' "setBundleType";
  qr.item as g where (linkId = 'consent') then {
    g.item as it where ((linkId = 'consent/disposition') 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.decision = 'permit' "decision";
      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 = 'Consent for the disposal of a body part removed at surgery' "catText";
      } "category";
      g.item as sa where ((linkId = 'consent/signed-at') and answer.value.exists()) then {
        sa.answer first as a then {
          a.value as v ->  con.period as per,  per.start = v "periodStart";
        };
      } "signedAtRule";
      // The disposition as the provision. Its own coding travels, so "taken
      // home" and "disposed by the hospital" stay distinguishable without
      // reading the note.
      it.answer first as a then {
        a.value as cv ->  con.provision as prov,  prov.code as pc then {
          cv -> pc.coding = cv "coding";
          cv.display as d -> pc.text = d "text";
        } "dispositionProvision";
      } "dispositionRule";
      qr.item as p where (linkId = 'procedure') then {
        p.item as bp where ((linkId = 'procedure/body-part') and answer.value.exists()) then {
          bp.answer first as a then {
            a.value as txt ->  con.provision as prov,  prov.code as pc,  pc.text = txt "bodyPartText";
          };
        } "bodyPartRule";
      } "procedureGroup";
      g.item as nk where ((linkId = 'consent/next-of-kin-name') and answer.value.exists()) then {
        nk.answer first as a then {
          a.value as txt ->  con.grantor = create('Reference') as gref,  gref.display = txt "grantor";
        };
      } "nextOfKinRule";
      qr.item as e where (linkId = 'explained-by') then {
        e.item as pr where ((linkId = 'explained-by/practitioner') and answer.value.exists()) then {
          pr.answer first as a then {
            a.value as ref -> con.verification as ver then {
              ref -> ver.verified = true "verified";
              ref -> ver.verifiedBy = ref "verifiedBy";
            } "verification";
          };
        } "explainedByRule";
      } "explainedByGroup";
    } "bodyPartConsent";
  } "consentGroup";
  // The procedure and the part removed, as an Observation. A histology request
  // or a later query about what was taken looks for the part, and a Consent
  // provision is not where a clinician goes to find it.
  qr.item as g where ((linkId = 'procedure') 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 SetProcedureCategory(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 = 'body-part-removal-body-part-removed-at-surgery' "cd";
        g -> cg.display = 'Body part removed at surgery' "dsp";
      } "coding";
    } "code";
    g.item as it where ((linkId = 'procedure/diagnosis') 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 = 'body-part-removal-diagnosis-before-the-procedure' "cd";
          it -> cg.display = 'Diagnosis before the procedure' "dsp";
        } "coding";
      } "code";
      it -> comp then SetComponentValue(it, comp) "value";
    } "comp_body_part_removal_diagnosis_before_the_procedure";
    g.item as it where ((linkId = 'procedure/name') 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 = 'body-part-removal-procedure-or-surgery-performed' "cd";
          it -> cg.display = 'Procedure or surgery performed' "dsp";
        } "coding";
      } "code";
      it -> comp then SetComponentValue(it, comp) "value";
    } "comp_body_part_removal_procedure_or_surgery_performed";
    g.item as it where ((linkId = 'procedure/body-part') 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 = 'body-part-removal-body-part-removed' "cd";
          it -> cg.display = 'Body part removed' "dsp";
        } "coding";
      } "code";
      it -> comp then SetComponentValue(it, comp) "value";
    } "comp_body_part_removal_body_part_removed";
  } "procedureObservation";
  qr.item as g where (linkId = 'handover') then {
    g.item as it where ((linkId = 'handover/theatre-staff') 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 = 'body-part-removal-theatre-staff-handing-over-the-body-part' "cd";
          it -> cg.display = 'Theatre staff handing over the body part' "dsp";
        } "coding";
      } "code";
      it.answer first as a then {
        a.value as txt ->  obs.note as n,  n.text = txt "text";
      };
    } "narr_body_part_removal_theatre_staff_handing_over_the_body_part";
    g.item as it where ((linkId = 'handover/mortuary-staff') 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 = 'body-part-removal-mortuary-staff-receiving-the-body-part' "cd";
          it -> cg.display = 'Mortuary staff receiving the body part' "dsp";
        } "coding";
      } "code";
      it.answer first as a then {
        a.value as txt ->  obs.note as n,  n.text = txt "text";
      };
    } "narr_body_part_removal_mortuary_staff_receiving_the_body_part";
  } "handoverGroup";
}

// ─────────────────────────────────────────────────────────────────────────────
// 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 SetProcedureCategory(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 = 'procedure' "categoryCode";
      qr -> coding.display = 'Procedure' "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 = 'body-part-disposal-consent' "provenanceCode";
      qr -> t.display = 'Body part disposal consent 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";
}