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

import CoreData
import Foundation
import LoopKit
import SwiftDate
import Swinject

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

protocol PumpHistoryStorage {
    func storePumpEvents(_ events: [NewPumpEvent])
    func storeEvents(_ events: [PumpHistoryEvent])
    func storeJournalCarbs(_ carbs: Int)
    func recent() -> [PumpHistoryEvent]
    func nightscoutTretmentsNotUploaded() -> [NigtscoutTreatment]
    func saveCancelTempEvents()
    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!

    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.duplicateInLastFourLoops(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 == PumpEvent.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

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

                        let newPumpEvent = PumpEventStored(context: self.context)
                        newPumpEvent.timestamp = event.date
                        newPumpEvent.type = PumpEvent.bolus.rawValue

                        let newBolusEntry = BolusStored(context: self.context)
                        newBolusEntry.pumpEvent = newPumpEvent
                        newBolusEntry.amount = amount as? NSDecimalNumber
                        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.timestamp = date
                        newPumpEvent.type = PumpEvent.tempBasal.rawValue

                        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:
                        let newPumpEvent = PumpEventStored(context: self.context)
                        newPumpEvent.timestamp = event.date
                        newPumpEvent.type = PumpEvent.pumpSuspend.rawValue

                    case .resume:
                        let newPumpEvent = PumpEventStored(context: self.context)
                        newPumpEvent.timestamp = event.date
                        newPumpEvent.type = PumpEvent.pumpResume.rawValue

                    case .rewind:
                        let newPumpEvent = PumpEventStored(context: self.context)
                        newPumpEvent.timestamp = event.date
                        newPumpEvent.type = PumpEvent.rewind.rawValue

                    case .prime:
                        let newPumpEvent = PumpEventStored(context: self.context)
                        newPumpEvent.timestamp = event.date
                        newPumpEvent.type = PumpEvent.prime.rawValue

                    case .alarm:
                        let newPumpEvent = PumpEventStored(context: self.context)
                        newPumpEvent.timestamp = event.date
                        newPumpEvent.type = PumpEvent.pumpAlarm.rawValue

                    default:
                        continue
                    }
                }

                do {
                    guard self.context.hasChanges else { return }
                    try self.context.save()
                    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 storeJournalCarbs(_ carbs: Int) {
        processQueue.async {
            let eventsToStore = [
                PumpHistoryEvent(
                    id: UUID().uuidString,
                    type: .journalCarbs,
                    timestamp: Date(),
                    amount: nil,
                    duration: nil,
                    durationMin: nil,
                    rate: nil,
                    temp: nil,
                    carbInput: carbs
                )
            ]
            self.storeEvents(eventsToStore)
        }
    }

    func storeEvents(_ events: [PumpHistoryEvent]) {
        processQueue.async {
            let file = OpenAPS.Monitor.pumpHistory
            var uniqEvents: [PumpHistoryEvent] = []
            self.storage.transaction { storage in
                storage.append(events, to: file, uniqBy: \.id)
                uniqEvents = storage.retrieve(file, as: [PumpHistoryEvent].self)?
                    .filter { $0.timestamp.addingTimeInterval(1.days.timeInterval) > Date() }
                    .sorted { $0.timestamp > $1.timestamp } ?? []
                storage.save(Array(uniqEvents), as: file)
            }
            self.broadcaster.notify(PumpHistoryObserver.self, on: self.processQueue) {
                $0.pumpHistoryDidUpdate(uniqEvents)
            }
        }
    }

    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: PumpHistoryEvent) -> EventType {
        if event.isSMB ?? false {
            return .smb
        }
        if event.isExternal ?? false {
            return .isExternal
        }
        return event.type
    }

    func nightscoutTretmentsNotUploaded() -> [NigtscoutTreatment] {
        let events = recent()
        guard !events.isEmpty else { return [] }

        let temps: [NigtscoutTreatment] = events.reduce([]) { result, event in
            var result = result
            switch event.type {
            case .tempBasal:
                result.append(NigtscoutTreatment(
                    duration: nil,
                    rawDuration: nil,
                    rawRate: event,
                    absolute: event.rate,
                    rate: event.rate,
                    eventType: .nsTempBasal,
                    createdAt: event.timestamp,
                    enteredBy: NigtscoutTreatment.local,
                    bolus: nil,
                    insulin: nil,
                    notes: nil,
                    carbs: nil,
                    fat: nil,
                    protein: nil,
                    targetTop: nil,
                    targetBottom: nil
                ))
            case .tempBasalDuration:
                if var last = result.popLast(), last.eventType == .nsTempBasal, last.createdAt == event.timestamp {
                    last.duration = event.durationMin
                    last.rawDuration = event
                    result.append(last)
                }
            default: break
            }
            return result
        }

        let bolusesAndCarbs = events.compactMap { event -> NigtscoutTreatment? in
            switch event.type {
            case .bolus:
                let eventType = determineBolusEventType(for: event)
                return NigtscoutTreatment(
                    duration: event.duration,
                    rawDuration: nil,
                    rawRate: nil,
                    absolute: nil,
                    rate: nil,
                    eventType: eventType,
                    createdAt: event.timestamp,
                    enteredBy: NigtscoutTreatment.local,
                    bolus: event,
                    insulin: event.amount,
                    notes: nil,
                    carbs: nil,
                    fat: nil,
                    protein: nil,
                    targetTop: nil,
                    targetBottom: nil
                )
            case .journalCarbs:
                return NigtscoutTreatment(
                    duration: nil,
                    rawDuration: nil,
                    rawRate: nil,
                    absolute: nil,
                    rate: nil,
                    eventType: .nsCarbCorrection,
                    createdAt: event.timestamp,
                    enteredBy: NigtscoutTreatment.local,
                    bolus: nil,
                    insulin: nil,
                    notes: nil,
                    carbs: Decimal(event.carbInput ?? 0),
                    fat: nil,
                    protein: nil,
                    targetTop: nil,
                    targetBottom: nil
                )
            default: return nil
            }
        }

        let misc = events.compactMap { event -> NigtscoutTreatment? in
            switch event.type {
            case .prime:
                return NigtscoutTreatment(
                    duration: event.duration,
                    rawDuration: nil,
                    rawRate: nil,
                    absolute: nil,
                    rate: nil,
                    eventType: .nsSiteChange,
                    createdAt: event.timestamp,
                    enteredBy: NigtscoutTreatment.local,
                    bolus: event,
                    insulin: nil,
                    notes: nil,
                    carbs: nil,
                    fat: nil,
                    protein: nil,
                    targetTop: nil,
                    targetBottom: nil
                )
            case .rewind:
                return NigtscoutTreatment(
                    duration: nil,
                    rawDuration: nil,
                    rawRate: nil,
                    absolute: nil,
                    rate: nil,
                    eventType: .nsInsulinChange,
                    createdAt: event.timestamp,
                    enteredBy: NigtscoutTreatment.local,
                    bolus: nil,
                    insulin: nil,
                    notes: nil,
                    carbs: nil,
                    fat: nil,
                    protein: nil,
                    targetTop: nil,
                    targetBottom: nil
                )
            case .pumpAlarm:
                return NigtscoutTreatment(
                    duration: 30, // minutes
                    rawDuration: nil,
                    rawRate: nil,
                    absolute: nil,
                    rate: nil,
                    eventType: .nsAnnouncement,
                    createdAt: event.timestamp,
                    enteredBy: NigtscoutTreatment.local,
                    bolus: nil,
                    insulin: nil,
                    notes: "Alarm \(String(describing: event.note)) \(event.type)",
                    carbs: nil,
                    fat: nil,
                    protein: nil,
                    targetTop: nil,
                    targetBottom: nil
                )
            default: return nil
            }
        }

        let uploaded = storage.retrieve(OpenAPS.Nightscout.uploadedPumphistory, as: [NigtscoutTreatment].self) ?? []

        let treatments = Array(Set([bolusesAndCarbs, temps, misc].flatMap { $0 }).subtracting(Set(uploaded)))

        return treatments.sorted { $0.createdAt! > $1.createdAt! }
    }

    func saveCancelTempEvents() {
        let basalID = UUID().uuidString
        let date = Date()

        let events = [
            PumpHistoryEvent(
                id: basalID,
                type: .tempBasalDuration,
                timestamp: date,
                amount: nil,
                duration: nil,
                durationMin: 0,
                rate: nil,
                temp: nil,
                carbInput: nil
            ),
            PumpHistoryEvent(
                id: "_" + basalID,
                type: .tempBasal,
                timestamp: date,
                amount: nil,
                duration: nil,
                durationMin: nil,
                rate: 0,
                temp: .absolute,
                carbInput: nil
            )
        ]

        storeEvents(events)
    }
}