define "Initial Population":
  "Major Depressive Disorder Encounter" MDDEncounter
    where ( "AgeInYearsAt"(date from start of "Measurement Period") >= 6
        and "AgeInYearsAt"(date from start of "Measurement Period") <= 16
    )

define "Denominator":
  "Initial Population"

define "Numerator":
  "Encounter With Procedure For Suicide Risk Assessment"
    union "Encounter With Observation For Suicide Risk Assessment"

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 "Encounter With Condition Major Depressive Disorder":
  ( ["Encounter": "Office Visit"]
    union ["Encounter": "Outpatient Consultation"]
    union ["Encounter": "Psych Visit Diagnostic Evaluation"]
    union ["Encounter": "Psych Visit for Family Psychotherapy"]
    union ["Encounter": "Psych Visit Psychotherapy"]
    union ["Encounter": "Psychoanalysis"]
    union ["Encounter": "Group Psychotherapy"]
    union ["Encounter": "Telephone Visits"] ) ValidEncounter
    where ValidEncounter.status = 'finished'
      and ValidEncounter.period during day of "Measurement Period"
      and exists ( ( ["ConditionProblemsHealthConcerns": "Major Depressive Disorder Active"] MDDConditionProb
            where ValidEncounter.reasonReference.references ( MDDConditionProb )
        )
          union ( ["ConditionEncounterDiagnosis": "Major Depressive Disorder Active"] MDDEncDx
              where ValidEncounter.reasonReference.references ( MDDEncDx )
          )
      )

define "Encounter With Reason Major Depressive Disorder":
  ( ["Encounter": "Office Visit"]
    union ["Encounter": "Outpatient Consultation"]
    union ["Encounter": "Psych Visit Diagnostic Evaluation"]
    union ["Encounter": "Psych Visit for Family Psychotherapy"]
    union ["Encounter": "Psych Visit Psychotherapy"]
    union ["Encounter": "Psychoanalysis"]
    union ["Encounter": "Group Psychotherapy"]
    union ["Encounter": "Telephone Visits"] ) ValidEncounter
    where ValidEncounter.status = 'finished'
      and ValidEncounter.period during day of "Measurement Period"
      and ( ValidEncounter.reasonCode in "Major Depressive Disorder Active" )

define "Major Depressive Disorder Encounter":
  "Encounter With Condition Major Depressive Disorder"
    union "Encounter With Reason Major Depressive Disorder"

define "Encounter With Procedure For Suicide Risk Assessment":
  "Major Depressive Disorder Encounter" MDDEncounter
    with ["Procedure": "Suicide risk assessment (procedure)"] SuicideRiskAssessmentProcedure
      such that SuicideRiskAssessmentProcedure.status = 'completed'
        and SuicideRiskAssessmentProcedure.performed.toInterval ( ) during MDDEncounter.period

define "Encounter With Observation For Suicide Risk Assessment":
  "Major Depressive Disorder Encounter" MDDEncounter
    with ( ["ObservationScreeningAssessment": "Suicide risk assessment (procedure)"]
      union ["ObservationClinicalResult": "Suicide risk assessment (procedure)"] ) ObservationSuicideRiskAssmt
      such that ObservationSuicideRiskAssmt.effective.toInterval ( ) during MDDEncounter.period
        and ObservationSuicideRiskAssmt.status in { 'final', 'corrected', 'amended' }

define "Numerator":
  "Encounter With Procedure For Suicide Risk Assessment"
    union "Encounter With Observation For Suicide Risk Assessment"

define "Initial Population":
  "Major Depressive Disorder Encounter" MDDEncounter
    where ( "AgeInYearsAt"(date from start of "Measurement Period") >= 6
        and "AgeInYearsAt"(date from start of "Measurement Period") <= 16
    )

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 [CodeableConcept](https://hl7.org/fhir/datatypes.html#CodeableConcept) value to a CQL Concept.
*/
define function ToConcept(concept FHIR.CodeableConcept):
    if concept is null then
        null
    else
        System.Concept {
            codes: concept.coding C return ToCode(C),
            display: concept.text.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
        }

/*
@description: Returns true if any of the given references are to the given resource
@comment: Returns true if the `id` element of the given resource exactly equals the tail of any of the given references.
NOTE: This function assumes resources from the same source server.
*/
define fluent function references(references List<Reference>, resource Resource):
  exists (references R where R.references(resource))

/*
@description: Returns true if the given reference is to the given resource
@comment: Returns true if the `id` element of the given resource exactly equals the tail of the given reference.
NOTE: This function assumes resources from the same source server.
*/
define fluent function references(reference Reference, resource Resource):
  resource.id = Last(Split(reference.reference, '/'))

/*
@description: Normalizes a value that is a choice of timing-valued types to an equivalent interval
@comment: Normalizes a choice type of DateTime, Quanitty, Interval<DateTime>, or Interval<Quantity> types
to an equivalent interval. This selection of choice types is a superset of the majority of choice types that are used as possible
representations for timing-valued elements in QICore, allowing this function to be used across any resource.
The input can be provided as a DateTime, Quantity, Interval<DateTime> or Interval<Quantity>.
The intent of this function is to provide a clear and concise mechanism to treat single
elements that have multiple possible representations as intervals so that logic doesn't have to account
for the variability. More complex calculations (such as medication request period or dispense period
calculation) need specific guidance and consideration. That guidance may make use of this function, but
the focus of this function is on single element calculations where the semantics are unambiguous.
If the input is a DateTime, the result a DateTime Interval beginning and ending on that DateTime.
If the input is a Quantity, the quantity is expected to be a calendar-duration interpreted as an Age,
and the result is a DateTime Interval beginning on the Date the patient turned that age and ending immediately before one year later.
If the input is a DateTime Interval, the result is the input.
If the input is a Quantity Interval, the quantities are expected to be calendar-durations interpreted as an Age, and the result
is a DateTime Interval beginning on the date the patient turned the age given as the start of the quantity interval, and ending
immediately before one year later than the date the patient turned the age given as the end of the quantity interval.
If the input is a Timing, an error will be thrown indicating that Timing calculations are not implemented. Any other input will reslt in a null DateTime Interval
*/
define fluent function toInterval(choice Choice<DateTime, Quantity, Interval<DateTime>, Interval<Quantity>, Timing>):
  case
	  when choice is DateTime then
    	Interval[choice as DateTime, choice as DateTime]
		when choice is Interval<DateTime> then
  		choice as Interval<DateTime>
		when choice is Quantity then
		  Interval[Patient.birthDate + (choice as Quantity),
			  Patient.birthDate + (choice as Quantity) + 1 year)
		when choice is Interval<Quantity> then
		  Interval[Patient.birthDate + (choice.low as Quantity),
			  Patient.birthDate + (choice.high as Quantity) + 1 year)
		when choice is Timing then
      Message(null, true, 'NOT_IMPLEMENTED', 'Error', 'Calculation of an interval from a Timing value is not supported') as Interval<DateTime>
		else
			null as Interval<DateTime>
	end