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+import Foundation
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+
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+struct ComputedCarbs {
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+ var carbs: Decimal
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+ var nsCarbs: Decimal
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+ var bwCarbs: Decimal
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+ var journalCarbs: Decimal
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+ var mealCOB: Decimal
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+ var currentDeviation: Decimal
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+ var maxDeviation: Decimal
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+ var minDeviation: Decimal
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+ var slopeFromMaxDeviation: Decimal
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+ var slopeFromMinDeviation: Decimal
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+ var allDeviations: [Decimal]
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+ var lastCarbTime: TimeInterval
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+ var bwFound: Bool
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+}
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+
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+struct IOBInput {
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+ let profile: Profile
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+ let history: [PumpHistoryEvent]
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+}
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+
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+struct COBInputs {
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+ let glucoseData: [BloodGlucose]
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+ let iobInputs: IOBInput
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+ let basalProfile: [BasalProfileEntry]
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+ var mealTime: TimeInterval?
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+ var ciTime: TimeInterval?
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+}
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+
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+enum MealTotal {
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+ static func recentCarbs(treatments: [MealInput], pumpHistory: [PumpHistoryEvent], profile: Profile, basalProfile: [BasalProfileEntry], glucose: [BloodGlucose], time: Date) -> ComputedCarbs? {
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+ guard treatments.isNotEmpty else { return nil }
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+
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+ var _treatments = treatments
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+ var carbs: Decimal = Decimal(0)
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+ var nsCarbs: Decimal = Decimal(0)
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+ var bwCarbs: Decimal = Decimal(0)
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+ var journalCarbs: Decimal = Decimal(0)
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+ let mealCarbTime: TimeInterval = time.timeIntervalSince1970
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+ var lastCarbTime: TimeInterval = 0
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+ var bwFound: Bool = false
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+
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+ let iobInputs = IOBInput(profile: profile, history: pumpHistory)
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+ var cobInputs = COBInputs(glucoseData: glucose, iobInputs: iobInputs, basalProfile: basalProfile, mealTime: mealCarbTime)
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+ var mealCOB: Decimal = Decimal(0)
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+
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+
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+ _treatments.sort(by: {
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+ $0.timestamp > $1.timestamp
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+ })
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+
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+ var carbsToRemove: Decimal = Decimal(0)
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+ var nsCarbsToRemove: Decimal = Decimal(0)
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+ var bwCarbsToRemove: Decimal = Decimal(0)
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+ var journalCarbsToRemove: Decimal = Decimal(0)
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+
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+ for treatment in _treatments {
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+ let now = time.timeIntervalSince1970
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+
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+ // Use new maxMealAbsorptionTime setting here instead of default 6 hrs
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+ var carbWindow = now - TimeInterval(hours: Double(truncating: profile.maxMealAbsorptionTime as NSNumber))
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+
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+ let treatmentDate = treatment.timestamp
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+ let treatmentTime = treatmentDate.timeIntervalSince1970
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+
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+ if (treatmentTime > carbWindow && treatmentTime <= now) {
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+
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+ if var _carbs = treatment.carbs, carbs >= 1 {
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+ if var _nsCarbs = treatment.nsCarbs, nsCarbs >= 1 {
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+ nsCarbs += _nsCarbs
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+ } else if var _bwCarbs = treatment.bwCarbs, bwCarbs >= 1 {
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+ bwCarbs += _bwCarbs
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+ bwFound = true
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+ } else if var _journalCarbs = treatment.journalCarbs, journalCarbs >= 1 {
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+ journalCarbs += _journalCarbs
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+ } else {
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+ print("Treatment carbs unclassified: \(treatment)")
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+ }
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+
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+ carbs += _carbs
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+
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+ cobInputs.mealTime = treatmentTime
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+ lastCarbTime = max(lastCarbTime,treatmentTime)
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+
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+ let myCarbsAbsorbed = Decimal(0) // TODO: call perted cob method here
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+
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+ // TODO: add logging?
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+ let myMealCOB = max(0, carbs - myCarbsAbsorbed)
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+ mealCOB = max(mealCOB, myMealCOB)
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+
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+ if myMealCOB < mealCOB {
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+ carbsToRemove += treatment.carbs ?? 0
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+ if var _nsCarbs = treatment.nsCarbs, nsCarbs >= 1 {
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+ nsCarbsToRemove += _nsCarbs
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+ } else if var _bwCarbs = treatment.bwCarbs, bwCarbs >= 1 {
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+ bwCarbsToRemove += _bwCarbs
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+ } else if var _journalCarbs = treatment.journalCarbs, journalCarbs >= 1 {
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+ journalCarbsToRemove += _journalCarbs
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+ }
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+ } else {
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+ carbsToRemove = 0;
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+ nsCarbsToRemove = 0;
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+ bwCarbsToRemove = 0;
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+ }
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+ }
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+ }
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+ }
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+
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+ // only include carbs actually used in calculating COB
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+ carbs -= carbsToRemove
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+ nsCarbs -= nsCarbsToRemove
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+ bwCarbs -= bwCarbsToRemove
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+ journalCarbs -= journalCarbsToRemove
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+
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+ // calculate the current deviation and steepest deviation downslope over the last hour
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+ cobInputs.ciTime = time.timeIntervalSince1970
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+ cobInputs.mealTime = TimeInterval(hours: Double(truncating: profile.maxMealAbsorptionTime as NSNumber))
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+
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+ // set a hard upper limit on COB to mitigate impact of erroneous or malicious carb entry
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+ mealCOB = min(profile.maxCOB, mealCOB)
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+ /// omiting maxCOB check here, the setting is not Optional in Swift and must be part of profile
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+
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+ // if currentDeviation is null or maxDeviation is 0, set mealCOB to 0 for zombie-carb safety
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+ // TODO: make these adjustments once we have cob.js ported
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+// if (typeof(c.currentDeviation) === 'undefined' || c.currentDeviation === null) {
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+// console.error("");
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+// console.error("Warning: setting mealCOB to 0 because currentDeviation is null/undefined");
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+// mealCOB = 0;
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+// }
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+// if (typeof(c.maxDeviation) === 'undefined' || c.maxDeviation === null) {
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+// console.error("");
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+// console.error("Warning: setting mealCOB to 0 because maxDeviation is 0 or undefined");
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+// mealCOB = 0;
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+// }
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+
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+ return ComputedCarbs(
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+ carbs: carbs,
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+ nsCarbs: nsCarbs,
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+ bwCarbs: bwCarbs,
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+ journalCarbs: journalCarbs,
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+ mealCOB: mealCOB,
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+ currentDeviation: 0,
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+ maxDeviation: 0,
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+ minDeviation: 0,
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+ slopeFromMaxDeviation: 0,
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+ slopeFromMinDeviation: 0,
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+ allDeviations: [],
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+ lastCarbTime: lastCarbTime,
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+ bwFound: bwFound
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+ )
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+ }
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+}
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+
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Deniz Cengiz