define "Initial Population":
  "Has Qualifying Encounter"
    and exists "Order for 12 Months of ADT in 3 Months Before to 9 Months After Start of Measurement Period"

define "Denominator":
  "Initial Population"

define "Numerator":
  "Has Baseline DEXA Scan Two Years Prior to the Start of or Less than Three Months After the Start of ADT"

define "Denominator Exception":
  exists ( "No Bone Density Scan Ordered Due to Patient Refusal" )
    or exists ( "No Bone Density Scan Performed Due to Patient Refusal" )

define "SDE Sex":
  case
    when Patient.sex = '248153007' then "Male (finding)"
    when Patient.sex = '248152002' then "Female (finding)"
    else null
  end

define "SDE Payer":
  [Coverage: type in "Payer Type"] Payer
    return {
      code: Payer.type,
      period: Payer.period
    }

define "SDE Ethnicity":
  Patient.ethnicity E
    return Tuple {
      codes: { E.ombCategory } union E.detailed,
      display: E.text
    }

define "SDE Race":
  Patient.race R
    return Tuple {
      codes: R.ombCategory union R.detailed,
      display: R.text
    }

define "SDE Sex":
  SDE."SDE Sex"

define "Androgen Deprivation Therapy for Urology Care Medication Active Start Dates":
  [MedicationRequest: "Androgen Deprivation Therapy for Urology Care"] ADTActive
    let firstMedicationPeriod: First((collapse(ADTActive.dosageInstruction.timing.repeat.bounds DoseTime
          return DoseTime.toInterval()
      )) DrugPeriods
        sort by start of $this
    ),

    //get the very first event as interval
    
    firstMedicationEvent: First((ADTActive.dosageInstruction.timing dosageTiming
        //returns first event for the specific dosageTiming
        
        return First(dosageTiming.event dosageTimingEvents
            sort ascending
        )) firstEvents
        sort ascending
    ),
    medicationDateTime: Min({ firstMedicationEvent, start of firstMedicationPeriod, 
      end of firstMedicationPeriod }
    )
    where ADTActive.status in { 'active', 'completed' }
      and ADTActive.intent in { 'order', 'original-order', 'reflex-order', 'filler-order', 'instance-order' }
    return medicationDateTime

define "Androgen Deprivation Therapy for Urology Care Medication Order Start Dates":
  [MedicationRequest: "Androgen Deprivation Therapy for Urology Care"] ADTOrder
    let firstMedicationPeriod: First((collapse(ADTOrder.dosageInstruction.timing.repeat.bounds DoseTime
          return DoseTime.toInterval()
      )) DrugPeriods
        sort by start of $this
    ),
    medicationDateTime: Min({ ADTOrder.authoredOn, start of firstMedicationPeriod, 
      end of firstMedicationPeriod }
    )
    where ADTOrder.status in { 'active', 'completed' }
      and ADTOrder.intent in { 'order', 'original-order', 'reflex-order', 'filler-order', 'instance-order' }
    return medicationDateTime

define "Prostate Cancer Diagnosis":
  ( [ConditionProblemsHealthConcerns: "Prostate Cancer"]
    union [ConditionEncounterDiagnosis: "Prostate Cancer"] ) ProstateCancer
    where ProstateCancer.prevalenceInterval ( ) overlaps day of "Measurement Period"
      and ProstateCancer.isVerified ( )

define "First ADT in 3 Months Before to 9 Months After Start of Measurement Period":
  First(("Androgen Deprivation Therapy for Urology Care Medication Active Start Dates"
      union "Androgen Deprivation Therapy for Urology Care Medication Order Start Dates") ADTDateTime
      with "Prostate Cancer Diagnosis" ProstateCancer
        such that ADTDateTime during day of ProstateCancer.prevalenceInterval()
          and ADTDateTime during day of Interval[start of "Measurement Period" - 3 months, start of "Measurement Period" + 9 months]
      sort ascending
  )

define "Order for 12 Months of ADT in 3 Months Before to 9 Months After Start of Measurement Period":
  [ServiceRequest: "Injection of leuprolide acetate for twelve month period (regime/therapy)"] OrderTwelveMonthADT
    with "First ADT in 3 Months Before to 9 Months After Start of Measurement Period" FirstADTMP
      such that OrderTwelveMonthADT.authoredOn on or after day of FirstADTMP
        and OrderTwelveMonthADT.authoredOn during day of Interval[start of "Measurement Period" - 3 months, start of "Measurement Period" + 9 months]
        and OrderTwelveMonthADT.status in { 'active', 'completed' }
        and OrderTwelveMonthADT.intent = 'order'

define "Has Baseline DEXA Scan Two Years Prior to the Start of or Less than Three Months After the Start of ADT":
  exists ( ( [ServiceRequest: "DEXA Bone Density for Urology Care"] DEXAOrdered
        with "Order for 12 Months of ADT in 3 Months Before to 9 Months After Start of Measurement Period" OrderTwelveMonthsADT
          such that DEXAOrdered.authoredOn 3 months or less on or after day of OrderTwelveMonthsADT.authoredOn
            or DEXAOrdered.authoredOn 2 years or less before day of OrderTwelveMonthsADT.authoredOn
        where DEXAOrdered.status in { 'active', 'completed' }
          and DEXAOrdered.intent = 'order'
    )
      union ( [ObservationClinicalResult: "DEXA Bone Density for Urology Care"] DEXAPerformed
          with "Order for 12 Months of ADT in 3 Months Before to 9 Months After Start of Measurement Period" OrderTwelveMonthsADT
            such that DEXAPerformed.effective.toInterval ( ) 3 months or less on or after day of OrderTwelveMonthsADT.authoredOn
              or DEXAPerformed.effective.toInterval ( ) 2 years or less before day of OrderTwelveMonthsADT.authoredOn
          where DEXAPerformed.status in { 'final', 'amended', 'corrected' }
      )
  )

define "Numerator":
  "Has Baseline DEXA Scan Two Years Prior to the Start of or Less than Three Months After the Start of ADT"

define "No Bone Density Scan Ordered Due to Patient Refusal":
  [ServiceNotRequested: "DEXA Bone Density for Urology Care"] DEXANotOrdered
    with "Order for 12 Months of ADT in 3 Months Before to 9 Months After Start of Measurement Period" OrderTwelveMonthsADT
      such that DEXANotOrdered.authoredOn 3 months or less on or after day of OrderTwelveMonthsADT.authoredOn
        and DEXANotOrdered.reasonRefused in "Patient Declined"

define "No Bone Density Scan Performed Due to Patient Refusal":
  [ObservationCancelled: "DEXA Bone Density for Urology Care"] DEXANotPerformed
    with "Order for 12 Months of ADT in 3 Months Before to 9 Months After Start of Measurement Period" OrderTwelveMonthsADT
      such that DEXANotPerformed.issued 3 months or less on or after day of OrderTwelveMonthsADT.authoredOn
        and DEXANotPerformed.notDoneReason in "Patient Declined"

define "Denominator Exception":
  exists ( "No Bone Density Scan Ordered Due to Patient Refusal" )
    or exists ( "No Bone Density Scan Performed Due to Patient Refusal" )

define "Has Qualifying Encounter":
  exists ( ["Encounter": "Office Visit"] OfficeVisit
      where OfficeVisit.period during day of "Measurement Period"
        and OfficeVisit.status = 'finished'
  )

define "Initial Population":
  "Has Qualifying Encounter"
    and exists "Order for 12 Months of ADT in 3 Months Before to 9 Months After Start of Measurement Period"

define "Denominator":
  "Initial Population"

define "SDE Payer":
  SDE."SDE Payer"

define "SDE Ethnicity":
  SDE."SDE Ethnicity"

define "SDE Race":
  SDE."SDE Race"

define function ToString(value uri): value.value

/*
@description: Converts the given [Period](https://hl7.org/fhir/datatypes.html#Period)
value to a CQL DateTime Interval
@comment: If the start value of the given period is unspecified, the starting
boundary of the resulting interval will be open (meaning the start of the interval
is unknown, as opposed to interpreted as the beginning of time).
*/
define function ToInterval(period FHIR.Period):
    if period is null then
        null
    else
        if period."start" is null then
            Interval(period."start".value, period."end".value]
        else
            Interval[period."start".value, period."end".value]

/*
@description: Converts the given FHIR [Coding](https://hl7.org/fhir/datatypes.html#Coding) value to a CQL Code.
*/
define function ToCode(coding FHIR.Coding):
    if coding is null then
        null
    else
        System.Code {
          code: coding.code.value,
          system: coding.system.value,
          version: coding.version.value,
          display: coding.display.value
        }