import Foundation

// Fetch Data for Glucose and Determination from Core Data and map them to the Structs in order to pass them thread safe to the glucoseDidUpdate/ pushUpdate function

@available(iOS 16.2, *)
extension LiveActivityBridge {
    func fetchAndMapGlucose() async {
        let results = await CoreDataStack.shared.fetchEntitiesAsync(
            ofType: GlucoseStored.self,
            onContext: context,
            predicate: NSPredicate.predicateForSixHoursAgo,
            key: "date",
            ascending: false,
            fetchLimit: 72
        )

        guard let glucoseResults = results as? [GlucoseStored] else {
            return
        }

        await context.perform {
            self.glucoseFromPersistence = glucoseResults.map {
                GlucoseData(glucose: Int($0.glucose), date: $0.date ?? Date(), direction: $0.directionEnum)
            }
        }
    }

    func fetchAndMapDetermination() async {
        let results = await CoreDataStack.shared.fetchEntitiesAsync(
            ofType: OrefDetermination.self,
            onContext: context,
            predicate: NSPredicate.predicateFor30MinAgoForDetermination,
            key: "deliverAt",
            ascending: false,
            fetchLimit: 1,
            propertiesToFetch: ["iob", "cob"]
        )

        guard let determinationResults = results as? [[String: Any]] else {
            return
        }

        await context.perform {
            self.determination = determinationResults.first.map {
                DeterminationData(
                    cob: ($0["cob"] as? Int) ?? 0,
                    iob: ($0["iob"] as? NSDecimalNumber)?.decimalValue ?? 0
                )
            }
        }
    }

    func fetchAndMapOverride() async {
        let results = await CoreDataStack.shared.fetchEntitiesAsync(
            ofType: OverrideStored.self,
            onContext: context,
            predicate: NSPredicate.predicateForOneDayAgo,
            key: "date",
            ascending: false,
            fetchLimit: 1,
            propertiesToFetch: ["enabled"]
        )

        guard let overrideResults = results as? [[String: Any]] else {
            return
        }

        await context.perform {
            self.isOverridesActive = overrideResults.first.map {
                OverrideData(isActive: $0["enabled"] as? Bool ?? false)
            }
        }
    }
}