Trio/FreeAPS/Sources/APS/Storage/PumpHistoryStorage.swift

import Combine
import CoreData
import Foundation
import LoopKit
import SwiftDate
import Swinject

protocol PumpHistoryObserver {
    func pumpHistoryDidUpdate(_ events: [PumpHistoryEvent])
}

protocol PumpHistoryStorage {
    var updatePublisher: AnyPublisher<Void, Never> { get }
    func storePumpEvents(_ events: [NewPumpEvent])
    func storeExternalInsulinEvent(amount: Decimal, timestamp: Date) async
    func recent() -> [PumpHistoryEvent]
    func getPumpHistoryNotYetUploadedToNightscout() async -> [NightscoutTreatment]
    func deleteInsulin(at date: Date)
}

final class BasePumpHistoryStorage: PumpHistoryStorage, Injectable {
    private let processQueue = DispatchQueue(label: "BasePumpHistoryStorage.processQueue")
    @Injected() private var storage: FileStorage!
    @Injected() private var broadcaster: Broadcaster!
    @Injected() private var settings: SettingsManager!

    private let updateSubject = PassthroughSubject<Void, Never>()

    var updatePublisher: AnyPublisher<Void, Never> {
        updateSubject.eraseToAnyPublisher()
    }

    init(resolver: Resolver) {
        injectServices(resolver)
    }

    typealias PumpEvent = PumpEventStored.EventType
    typealias TempType = PumpEventStored.TempType

    private let context = CoreDataStack.shared.newTaskContext()

    private func roundDose(_ dose: Double, toIncrement increment: Double) -> Decimal {
        let roundedValue = (dose / increment).rounded() * increment
        return Decimal(roundedValue)
    }

    func storePumpEvents(_ events: [NewPumpEvent]) {
        processQueue.async {
            self.context.perform {
                for event in events {
                    // Fetch to filter out duplicates
                    // TODO: - move this to the Core Data Class

                    let existingEvents: [PumpEventStored] = CoreDataStack.shared.fetchEntities(
                        ofType: PumpEventStored.self,
                        onContext: self.context,
                        predicate: NSPredicate.duplicateInLastHour(event.date),
                        key: "timestamp",
                        ascending: false,
                        batchSize: 50
                    )

                    switch event.type {
                    case .bolus:

                        guard let dose = event.dose else { continue }
                        let amount = self.roundDose(
                            dose.unitsInDeliverableIncrements,
                            toIncrement: Double(self.settings.preferences.bolusIncrement)
                        )

                        guard existingEvents.isEmpty else {
                            // Duplicate found, do not store the event
                            print("Duplicate event found with timestamp: \(event.date)")

                            if let existingEvent = existingEvents.first(where: { $0.type == EventType.bolus.rawValue }) {
                                if existingEvent.timestamp == event.date {
                                    if let existingAmount = existingEvent.bolus?.amount, amount < existingAmount as Decimal {
                                        // Update existing event with new smaller value
                                        existingEvent.bolus?.amount = amount as NSDecimalNumber
                                        existingEvent.bolus?.isSMB = dose.automatic ?? true
                                        existingEvent.isUploadedToNS = false

                                        print("Updated existing event with smaller value: \(amount)")
                                    }
                                }
                            }
                            continue
                        }

                        let newPumpEvent = PumpEventStored(context: self.context)
                        newPumpEvent.id = UUID().uuidString
                        newPumpEvent.timestamp = event.date
                        newPumpEvent.type = PumpEvent.bolus.rawValue
                        newPumpEvent.isUploadedToNS = false

                        let newBolusEntry = BolusStored(context: self.context)
                        newBolusEntry.pumpEvent = newPumpEvent
                        newBolusEntry.amount = NSDecimalNumber(decimal: amount)
                        newBolusEntry.isExternal = dose.manuallyEntered
                        newBolusEntry.isSMB = dose.automatic ?? true

                    case .tempBasal:
                        guard let dose = event.dose else { continue }

                        guard existingEvents.isEmpty else {
                            // Duplicate found, do not store the event
                            print("Duplicate event found with timestamp: \(event.date)")
                            continue
                        }

                        let rate = Decimal(dose.unitsPerHour)
                        let minutes = (dose.endDate - dose.startDate).timeInterval / 60
                        let delivered = dose.deliveredUnits
                        let date = event.date

                        let isCancel = delivered != nil
                        guard !isCancel else { continue }

                        let newPumpEvent = PumpEventStored(context: self.context)
                        newPumpEvent.id = UUID().uuidString
                        newPumpEvent.timestamp = date
                        newPumpEvent.type = PumpEvent.tempBasal.rawValue
                        newPumpEvent.isUploadedToNS = false

                        let newTempBasal = TempBasalStored(context: self.context)
                        newTempBasal.pumpEvent = newPumpEvent
                        newTempBasal.duration = Int16(round(minutes))
                        newTempBasal.rate = rate as NSDecimalNumber
                        newTempBasal.tempType = TempType.absolute.rawValue

                    case .suspend:
                        guard existingEvents.isEmpty else {
                            // Duplicate found, do not store the event
                            print("Duplicate event found with timestamp: \(event.date)")
                            continue
                        }
                        let newPumpEvent = PumpEventStored(context: self.context)
                        newPumpEvent.id = UUID().uuidString
                        newPumpEvent.timestamp = event.date
                        newPumpEvent.type = PumpEvent.pumpSuspend.rawValue
                        newPumpEvent.isUploadedToNS = false

                    case .resume:
                        guard existingEvents.isEmpty else {
                            // Duplicate found, do not store the event
                            print("Duplicate event found with timestamp: \(event.date)")
                            continue
                        }
                        let newPumpEvent = PumpEventStored(context: self.context)
                        newPumpEvent.id = UUID().uuidString
                        newPumpEvent.timestamp = event.date
                        newPumpEvent.type = PumpEvent.pumpResume.rawValue
                        newPumpEvent.isUploadedToNS = false

                    case .rewind:
                        guard existingEvents.isEmpty else {
                            // Duplicate found, do not store the event
                            print("Duplicate event found with timestamp: \(event.date)")
                            continue
                        }
                        let newPumpEvent = PumpEventStored(context: self.context)
                        newPumpEvent.id = UUID().uuidString
                        newPumpEvent.timestamp = event.date
                        newPumpEvent.type = PumpEvent.rewind.rawValue
                        newPumpEvent.isUploadedToNS = false

                    case .prime:
                        guard existingEvents.isEmpty else {
                            // Duplicate found, do not store the event
                            print("Duplicate event found with timestamp: \(event.date)")
                            continue
                        }
                        let newPumpEvent = PumpEventStored(context: self.context)
                        newPumpEvent.id = UUID().uuidString
                        newPumpEvent.timestamp = event.date
                        newPumpEvent.type = PumpEvent.prime.rawValue
                        newPumpEvent.isUploadedToNS = false

                    case .alarm:
                        guard existingEvents.isEmpty else {
                            // Duplicate found, do not store the event
                            print("Duplicate event found with timestamp: \(event.date)")
                            continue
                        }
                        let newPumpEvent = PumpEventStored(context: self.context)
                        newPumpEvent.id = UUID().uuidString
                        newPumpEvent.timestamp = event.date
                        newPumpEvent.type = PumpEvent.pumpAlarm.rawValue
                        newPumpEvent.isUploadedToNS = false
                        newPumpEvent.note = event.title

                    default:
                        continue
                    }
                }

                do {
                    guard self.context.hasChanges else { return }
                    try self.context.save()

                    self.updateSubject.send(())
                    debugPrint("\(DebuggingIdentifiers.succeeded) stored pump events in Core Data")
                } catch let error as NSError {
                    debugPrint("\(DebuggingIdentifiers.failed) failed to store pump events with error: \(error.userInfo)")
                }
            }
        }
    }

    func storeExternalInsulinEvent(amount: Decimal, timestamp: Date) async {
        debug(.default, "External insulin saved")
        await context.perform {
            // create pump event
            let newPumpEvent = PumpEventStored(context: self.context)
            newPumpEvent.id = UUID().uuidString
            newPumpEvent.timestamp = timestamp
            newPumpEvent.type = PumpEvent.bolus.rawValue
            newPumpEvent.isUploadedToNS = false

            // create bolus entry and specify relationship to pump event
            let newBolusEntry = BolusStored(context: self.context)
            newBolusEntry.pumpEvent = newPumpEvent
            newBolusEntry.amount = amount as NSDecimalNumber
            newBolusEntry.isExternal = true // we are creating an external dose
            newBolusEntry.isSMB = false // the dose is manually administered

            do {
                guard self.context.hasChanges else { return }
                try self.context.save()

                self.updateSubject.send(())
            } catch {
                print(error.localizedDescription)
            }
        }
    }

    func recent() -> [PumpHistoryEvent] {
        storage.retrieve(OpenAPS.Monitor.pumpHistory, as: [PumpHistoryEvent].self)?.reversed() ?? []
    }

    func deleteInsulin(at date: Date) {
        processQueue.sync {
            var allValues = storage.retrieve(OpenAPS.Monitor.pumpHistory, as: [PumpHistoryEvent].self) ?? []
            guard let entryIndex = allValues.firstIndex(where: { $0.timestamp == date }) else {
                return
            }
            allValues.remove(at: entryIndex)
            storage.save(allValues, as: OpenAPS.Monitor.pumpHistory)
            broadcaster.notify(PumpHistoryObserver.self, on: processQueue) {
                $0.pumpHistoryDidUpdate(allValues)
            }
        }
    }

    func determineBolusEventType(for event: PumpEventStored) -> PumpEventStored.EventType {
        if event.bolus!.isSMB {
            return .smb
        }
        if event.bolus!.isExternal {
            return .isExternal
        }
        return PumpEventStored.EventType(rawValue: event.type!) ?? PumpEventStored.EventType.bolus
    }

    func getPumpHistoryNotYetUploadedToNightscout() async -> [NightscoutTreatment] {
        let results = await CoreDataStack.shared.fetchEntitiesAsync(
            ofType: PumpEventStored.self,
            onContext: context,
            predicate: NSPredicate.pumpEventsNotYetUploadedToNightscout,
            key: "timestamp",
            ascending: false,
            fetchLimit: 288
        )

        guard let fetchedPumpEvents = results as? [PumpEventStored] else { return [] }

        return await context.perform { [self] in
            fetchedPumpEvents.map { event in
                switch event.type {
                case PumpEvent.bolus.rawValue:
                    // eventType determines whether bolus is external, smb or manual (=administered via app by user)
                    let eventType = determineBolusEventType(for: event)
                    return NightscoutTreatment(
                        duration: nil,
                        rawDuration: nil,
                        rawRate: nil,
                        absolute: nil,
                        rate: nil,
                        eventType: eventType,
                        createdAt: event.timestamp,
                        enteredBy: NightscoutTreatment.local,
                        bolus: nil,
                        insulin: event.bolus?.amount as Decimal?,
                        notes: nil,
                        carbs: nil,
                        fat: nil,
                        protein: nil,
                        targetTop: nil,
                        targetBottom: nil,
                        id: event.id
                    )
                case PumpEvent.tempBasal.rawValue:
                    return NightscoutTreatment(
                        duration: Int(event.tempBasal?.duration ?? 0),
                        rawDuration: nil,
                        rawRate: nil,
                        absolute: event.tempBasal?.rate as Decimal?,
                        rate: event.tempBasal?.rate as Decimal?,
                        eventType: .nsTempBasal,
                        createdAt: event.timestamp,
                        enteredBy: NightscoutTreatment.local,
                        bolus: nil,
                        insulin: nil,
                        notes: nil,
                        carbs: nil,
                        fat: nil,
                        protein: nil,
                        targetTop: nil,
                        targetBottom: nil,
                        id: event.id
                    )
                case PumpEvent.pumpSuspend.rawValue:
                    return NightscoutTreatment(
                        duration: nil,
                        rawDuration: nil,
                        rawRate: nil,
                        absolute: nil,
                        rate: nil,
                        eventType: .nsNote,
                        createdAt: event.timestamp,
                        enteredBy: NightscoutTreatment.local,
                        bolus: nil,
                        insulin: nil,
                        notes: PumpEvent.pumpSuspend.rawValue,
                        carbs: nil,
                        fat: nil,
                        protein: nil,
                        targetTop: nil,
                        targetBottom: nil
                    )
                case PumpEvent.pumpResume.rawValue:
                    return NightscoutTreatment(
                        duration: nil,
                        rawDuration: nil,
                        rawRate: nil,
                        absolute: nil,
                        rate: nil,
                        eventType: .nsNote,
                        createdAt: event.timestamp,
                        enteredBy: NightscoutTreatment.local,
                        bolus: nil,
                        insulin: nil,
                        notes: PumpEvent.pumpResume.rawValue,
                        carbs: nil,
                        fat: nil,
                        protein: nil,
                        targetTop: nil,
                        targetBottom: nil
                    )
                case PumpEvent.rewind.rawValue:
                    return NightscoutTreatment(
                        duration: nil,
                        rawDuration: nil,
                        rawRate: nil,
                        absolute: nil,
                        rate: nil,
                        eventType: .nsInsulinChange,
                        createdAt: event.timestamp,
                        enteredBy: NightscoutTreatment.local,
                        bolus: nil,
                        insulin: nil,
                        notes: nil,
                        carbs: nil,
                        fat: nil,
                        protein: nil,
                        targetTop: nil,
                        targetBottom: nil
                    )
                case PumpEvent.prime.rawValue:
                    return NightscoutTreatment(
                        duration: nil,
                        rawDuration: nil,
                        rawRate: nil,
                        absolute: nil,
                        rate: nil,
                        eventType: .nsSiteChange,
                        createdAt: event.timestamp,
                        enteredBy: NightscoutTreatment.local,
                        bolus: nil,
                        insulin: nil,
                        notes: nil,
                        carbs: nil,
                        fat: nil,
                        protein: nil,
                        targetTop: nil,
                        targetBottom: nil
                    )
                case PumpEvent.pumpAlarm.rawValue:
                    return NightscoutTreatment(
                        duration: 30, // minutes
                        rawDuration: nil,
                        rawRate: nil,
                        absolute: nil,
                        rate: nil,
                        eventType: .nsAnnouncement,
                        createdAt: event.timestamp,
                        enteredBy: NightscoutTreatment.local,
                        bolus: nil,
                        insulin: nil,
                        notes: "Alarm \(String(describing: event.note)) \(PumpEvent.pumpAlarm.rawValue)",
                        carbs: nil,
                        fat: nil,
                        protein: nil,
                        targetTop: nil,
                        targetBottom: nil
                    )

                default:
                    return nil
                }
            }.compactMap { $0 }
        }
    }
}