/// url = 'https://fhir.slade360.co.ke/fhir/StructureMap/ExtractPaediatricNebulizationChart'
/// name = 'ExtractPaediatricNebulizationChart'
/// title = 'Paediatric Nebulization Chart Extraction'
/// status = 'active'
/// description = 'One MedicationAdministration per row. Unlike the tick-box charts in this set, this one records the drug, the amount and the time it was given -- which is exactly what a MedicationAdministration needs in order to be an honest claim. The drug name and the amount travel as written: the hospital\'s formulary is not coded and a guessed code on a bronchodilator dose is the wrong place to be wrong.'

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/MedicationAdministration" alias MedicationAdministration as target

group ExtractPaediatricNebulizationChart(source qr : QR, target bundle : Bundle) {
  qr -> bundle.type = 'transaction' "setBundleType";
  qr.item as row where ((linkId = 'nebulisation') and item.where(linkId = 'nebulisation/drug').answer.value.exists()) ->  bundle.entry as entry,  entry.resource = create('MedicationAdministration') as ma then {
    qr ->  ma,  entry then BuildMedicationAdministrationBase(qr, ma, entry) "base";
    row -> ma.status = 'completed' "status";
    qr.encounter as e -> ma.encounter = e;
    row.item as it where (linkId = 'nebulisation/drug') then {
      it.answer first as a then {
        a.value as txt ->  ma.medication as med,  med.concept as mc,  mc.text = txt "medicationText";
      };
    } "drugRule";
    row.item as it where ((linkId = 'nebulisation/amount') and answer.value.exists()) then {
      it.answer first as a then {
        a.value as txt ->  ma.dosage as dos,  dos.text = txt "dosageText";
      };
    } "amountRule";
    row.item as it where ((linkId = 'nebulisation/frequency') and answer.value.exists()) then {
      it.answer first as a then {
        a.value as txt ->  ma.note as n,  n.text = txt "frequencyNote";
      };
    } "frequencyRule";
    row.item as it where ((linkId = 'nebulisation/at') and answer.value.exists()) then {
      it.answer first as a then {
        a.value as v -> ma.occurence = v "occurrence";
      };
    } "atRule";
    row.item as it where ((linkId = 'nebulisation/given-by') and answer.value.exists()) then {
      it.answer first as a then {
        a.value as ref ->  ma.performer as p,  p.actor = create('CodeableReference') as cr,  cr.reference = ref "performer";
      };
    } "givenByRule";
    // The route. Every row on this chart is a nebulisation, so it is stated
    // rather than asked -- the sheet's title is the route.
    row ->  ma.dosage as dos,  dos.route as rt then {
      row -> rt.coding as cg then {
        row -> cg.system = 'http://snomed.info/sct' "sys";
        row -> cg.code = '447694001' "cd";
        row -> cg.display = 'Respiratory tract route' "dsp";
      } "coding";
    } "route";
  } "nebulisationRow";
}

// ─────────────────────────────────────────────────────────────────────────────
// 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 BuildMedicationAdministrationBase(source qr : QR, target r : MedicationAdministration, target entry) {
  qr -> r then SetResponseProvenance(qr, r) "responseProvenance";
  qr -> r.id = uuid() then SetMedicationAdministrationFullUrl(r, entry) "idAndFullUrl";
  qr -> entry.request as request then {
    qr -> request.method = 'POST' "requestMethod";
    qr -> request.url = 'MedicationAdministration' "requestUrl";
  } "entryRequest";
  qr.subject as s -> r.subject = s;
  // The response's own time, as a floor. A row that names the time it was given
  // overwrites this; a form whose time column was taken off on review would
  // otherwise produce an administration with no time at all, which is not a
  // record of an administration. Same fallback BuildObsBase already applies.
  qr.authored as t -> r.occurence = t "occurrenceFallback";
}

group SetMedicationAdministrationFullUrl(source r : MedicationAdministration, target entry) {
  r.id as id -> entry.fullUrl = append('https://fhir.slade360.co.ke/fhir/MedicationAdministration/', 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 = 'paediatric-nebulization-chart' "provenanceCode";
      qr -> t.display = 'Paediatric nebulization chart' "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";
}