library MBODAInitialExpressions

using USCore version '7.0.0'
using FHIR version '4.0.1'

include hl7.fhir.uv.cql.FHIRHelpers version '4.0.1'
include hl7.fhir.uv.cql.FHIRCommon version '2.0.0'
include USCoreCommon called UC
include USCoreElements called UCE

//CumulativeMedicationDuration was created as part of the US ECQM and CDC Opioid Guideline development 
//http://fhir.org/guides/cdc/opioid-mme-r4
include CumulativeMedicationDuration called CMD

codesystem "LOINC": 'http://loinc.org'
codesystem "Identifier Type": 'http://terminology.hl7.org/CodeSystem/v2-0203'
code "Body surface area": '8277-6' from "LOINC" display 'Intensive care unit'
code "Member Number": 'MB' from "Identifier Type"

parameter "MedicationRequest" USCore.MedicationRequestProfile

context Patient

// define "Last Name":
//   UCE.lastName

// define "First Name":
//   UCE."First Name"

define "Allergies":
  UCE."Active Confirmed Allergies and Intolerances".code.coding.first().display 

define "Height":
  ((UCE."All Body Height Measurements").mostRecent()).value

define "Height in [in_i]":
  convert ("Height") to '[in_i]'

define "Height in cm":
  convert("Height") to 'cm'

define "Weight":
  (UCE."All Body Weight Measurements").mostRecent().value

define "Weight in [lb_av]":
  convert ("Weight") to '[lb_av]'

define "Weight in kg":
  convert("Weight") to 'kg'

define "BMI":
  (UCE."All Body Mass Index Measurements").value

define "Most Recent BSA":
  UCE."Most Recent BSA"

define "BSA":
  Coalesce("Most Recent BSA", "Calculated BSA - Mosteller")

define "BSA in m2":
  "BSA".value

// Mosteller formula using lbs and inches
define "Calculated BSA - Mosteller":
  UCE.CalculateBSA('Mosteller', "Height", "Weight")
  //((("Weight"*"Height")/3131).value)^0.5

define "Calculated BSA - DuBois and DuBois":
  UCE.CalculateBSA('DuBois and DuBois', "Height", "Weight")

define "Diagnosis Codes":
  UCE."All Conditions" C
    return C.code

define "Diagnosis Descriptions":
  "Diagnosis Codes" ConceptItem
    return
      if ConceptItem.coding is null then
        ConceptItem.text.value
      else
        Combine(ConceptItem.coding.display, '|')

define "Medication Requested":
  UCE."All Medications" M
    where EndsWith(("Most Recent Medication Request".medication).reference, M.id)

define "Medication Name":
  "Medication Requested" M
    return Combine(((M.code.coding) C return C.display), '|')

define "Code of Requested Drug":
  "Medication Requested" M
    return M.code

define "Retrieve Medication Request test parameter":
  // The VSCode extension doesn't support parameters
  // When executing CQL with the VSCode extension retrieve the resource specific for the test case
  //   the list of resource ids match the resources from the test case folders
  singleton from ([USCore.MedicationRequestProfile] MR where MR.id in { 
    'example',
    'example-continued-therapy',
    'example-new-therapy',
    'uscore-patient-1-med-request-example',
    'uscore-patient-2-med-request-example',
    'uscore-patient-3-med-request-example',
    'uscore-patient-4-med-request-example'})

define "Most Recent Medication Request":
  Coalesce(
    MedicationRequest,
    "Retrieve Medication Request test parameter"
  )

define "Medication Request References":
  ("Most Recent Medication Request".medication).reference

define "Most Recent Medication Request dosageInstruction":
  // TODO: should this really be a singleton?
  singleton from "Most Recent Medication Request".dosageInstruction

define "Most Recent Medication Request dosageInstruction.doseAndRate":
  // TODO: should this really be a singleton?
  singleton from "Most Recent Medication Request dosageInstruction".doseAndRate

define "Medication Dose":
  "Most Recent Medication Request dosageInstruction.doseAndRate".dose

define "Medication Route":
  "Most Recent Medication Request dosageInstruction".route

define "Medication Frequency value":
  "Most Recent Medication Request dosageInstruction".timing.repeat.frequency

define "Medication Frequency Period":
  if (IsNull("Most Recent Medication Request dosageInstruction".timing.repeat.period)) then 
    null
  else
    System.Quantity {
      value: "Most Recent Medication Request dosageInstruction".timing.repeat.period,
      unit: "Most Recent Medication Request dosageInstruction".timing.repeat.periodUnit
    }

define "Medication Frequency": // '1x per 1d', '3x per 2wk', '1x per 1mo'
  ToString("Medication Frequency value") + 'x' +
  ' per ' + ToString("Medication Frequency Period".value) + 
  ' ' + "Medication Frequency Period".unit

define "Quantity or Number of requested Visits":
  "Most Recent Medication Request".dispenseRequest.quantity

define "Prior Prescription":
  "Most Recent Medication Request".priorPrescription

define "New therapy":
  IsNull("Prior Prescription")

define "New therapy code":
  if ("New therapy") then
    System.Code { code: 'NewMedication', display: 'New Medication' }
  else
    System.Code { code: 'ContinuedTherapy', display: 'Continuation of therapy' }

// MISSING: needs test data to validate
//Initial date of therapy does not return correct result if there have been more than 1 prior Prescriptions - logic needs to be adapted to that case
define "Initial date of therapy":
  if not "New therapy" then
    UCE."All Medication Requests" M
      where EndsWith(("Most Recent Medication Request".priorPrescription).reference, M.id)
      return M.authoredOn
  else 
    null

define "Medication Request Period":
  CMD."MedicationRequestPeriod"("Most Recent Medication Request")

define "Expected Therapy Length":
  convert(
    CMD.Quantity(days between start of "Medication Request Period" and end of "Medication Request Period", 'd')
  ) to 'd'

define "Anticipated/actual date of service":
  start of "Medication Request Period"

/*
//related Procedures - Procedure is not linked to medication request - not possible to find the related procedures
*/

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