// LoopFollow
// DeviceStatusOpenAPS.swift

import Foundation
import HealthKit
import UIKit

extension MainViewController {
    func DeviceStatusOpenAPS(formatter: ISO8601DateFormatter, lastDeviceStatus: [String: AnyObject]?, lastLoopRecord: [String: AnyObject]) {
        Storage.shared.device.value = lastDeviceStatus?["device"] as? String ?? ""
        if lastLoopRecord["failureReason"] != nil {
            Observable.shared.loopStatusText.value = "X"
            latestLoopStatusString = "X"
        } else {
            guard let enactedOrSuggested = lastLoopRecord["suggested"] as? [String: AnyObject] ?? lastLoopRecord["enacted"] as? [String: AnyObject] else {
                Observable.shared.loopStatusText.value = "↻"
                latestLoopStatusString = "↻"
                return
            }

            var updatedTime: TimeInterval?

            if let timestamp = enactedOrSuggested["deliverAt"] as? String ?? enactedOrSuggested["timestamp"] as? String,
               let parsedTime = formatter.date(from: timestamp)?.timeIntervalSince1970
            {
                updatedTime = parsedTime
                let formattedTime = Localizer.formatTimestampToLocalString(parsedTime)
                infoManager.updateInfoData(type: .updated, value: formattedTime)
                Observable.shared.enactedOrSuggested.value = updatedTime
            }

            // ISF
            let profileISF = profileManager.currentISF()
            var enactedISF: HKQuantity?
            // Some uploaders (e.g. Trio Swift oref with dynamic ISF) report a
            // placeholder 0 in the structured ISF field; treat that as missing.
            if let enactedISFValue = enactedOrSuggested["ISF"] as? Double, enactedISFValue != 0 {
                enactedISF = HKQuantity(unit: .milligramsPerDeciliter, doubleValue: enactedISFValue)
            }
            if let profileISF = profileISF, let enactedISF = enactedISF, profileISF != enactedISF {
                infoManager.updateInfoData(type: .isf, firstValue: profileISF, secondValue: enactedISF, separator: .arrow)
                Storage.shared.lastIsfMgdlPerU.value = enactedISF.doubleValue(for: .milligramsPerDeciliter)
            } else if let profileISF = profileISF {
                infoManager.updateInfoData(type: .isf, value: profileISF)
                Storage.shared.lastIsfMgdlPerU.value = profileISF.doubleValue(for: .milligramsPerDeciliter)
            }

            // Carb Ratio (CR)
            // Prefer the structured CR field; fall back to parsing it out of the
            // reason string for uploaders that don't expose it (a CR of 0 is never
            // valid, so it's treated as missing).
            let profileCR = profileManager.currentCarbRatio()
            var enactedCR: Double?
            if let structuredCR = enactedOrSuggested["CR"] as? Double, structuredCR != 0 {
                enactedCR = structuredCR
            } else if let reasonString = enactedOrSuggested["reason"] as? String {
                let pattern = "CR: (\\d+(?:\\.\\d+)?)"
                if let regex = try? NSRegularExpression(pattern: pattern) {
                    let nsString = reasonString as NSString
                    if let match = regex.firstMatch(in: reasonString, range: NSRange(location: 0, length: nsString.length)) {
                        let crString = nsString.substring(with: match.range(at: 1))
                        enactedCR = Double(crString)
                    }
                }
            }

            if let profileCR = profileCR, let enactedCR = enactedCR, profileCR != enactedCR {
                infoManager.updateInfoData(type: .carbRatio, value: profileCR, enactedValue: enactedCR, separator: .arrow)
                Storage.shared.lastCarbRatio.value = enactedCR
            } else if let profileCR = profileCR {
                infoManager.updateInfoData(type: .carbRatio, value: profileCR)
                Storage.shared.lastCarbRatio.value = profileCR
            }

            // IOB
            if let iobMetric = InsulinMetric(from: lastLoopRecord["iob"], key: "iob") {
                infoManager.updateInfoData(type: .iob, value: iobMetric)
                latestIOB = iobMetric
                Observable.shared.iobText.value = iobMetric.formattedValue()
            }

            // COB
            if let cobMetric = CarbMetric(from: enactedOrSuggested, key: "COB") {
                infoManager.updateInfoData(type: .cob, value: cobMetric)
                latestCOB = cobMetric
            } else if let reasonString = enactedOrSuggested["reason"] as? String {
                // Fallback: Extract COB from reason string
                let cobPattern = "COB: (\\d+(?:\\.\\d+)?)"
                if let cobRegex = try? NSRegularExpression(pattern: cobPattern),
                   let cobMatch = cobRegex.firstMatch(in: reasonString, range: NSRange(location: 0, length: reasonString.utf16.count))
                {
                    let cobValueString = (reasonString as NSString).substring(with: cobMatch.range(at: 1))
                    if let cobValue = Double(cobValueString) {
                        let tempDict: [String: AnyObject] = ["COB": cobValue as AnyObject]
                        if let fallbackCobMetric = CarbMetric(from: tempDict, key: "COB") {
                            infoManager.updateInfoData(type: .cob, value: fallbackCobMetric)
                            latestCOB = fallbackCobMetric
                        } else {
                            print("Failed to create CarbMetric from extracted COB value: \(cobValue)")
                        }
                    } else {
                        print("Invalid COB value extracted from reason string: \(cobValueString)")
                    }
                } else {
                    print("COB pattern not found in reason string.")
                }
            }

            // Autosens
            if let sens = enactedOrSuggested["sensitivityRatio"] as? Double {
                let formattedSens = String(format: "%.0f", sens * 100.0) + "%"
                infoManager.updateInfoData(type: .autosens, value: formattedSens)
                Storage.shared.lastAutosens.value = sens
            }

            // Recommended Bolus
            if let rec = lastLoopRecord["recommendedBolus"] as? Double {
                infoManager.updateInfoData(type: .recBolus, value: InsulinFormatter.shared.string(rec))
                Observable.shared.deviceRecBolus.value = rec
            } else {
                infoManager.clearInfoData(type: .recBolus)
                Observable.shared.deviceRecBolus.value = nil
            }

            // Eventual BG
            if let eventualBGValue = enactedOrSuggested["eventualBG"] as? Double {
                let eventualBGQuantity = HKQuantity(unit: .milligramsPerDeciliter, doubleValue: eventualBGValue)
                Observable.shared.predictionText.value = Localizer.formatQuantity(eventualBGQuantity)
                Storage.shared.projectedBgMgdl.value = eventualBGValue
            } else {
                Storage.shared.projectedBgMgdl.value = nil
            }

            // Target
            let profileTargetHigh = profileManager.currentTargetHigh()
            var enactedTarget: HKQuantity?
            if let enactedTargetValue = enactedOrSuggested["current_target"] as? Double {
                var targetUnit = HKUnit.milligramsPerDeciliter
                if enactedTargetValue < 40 {
                    targetUnit = .millimolesPerLiter
                }
                enactedTarget = HKQuantity(unit: targetUnit, doubleValue: enactedTargetValue)
            }

            if let profileTargetHigh = profileTargetHigh, let enactedTarget = enactedTarget {
                let profileTargetHighFormatted = Localizer.formatQuantity(profileTargetHigh)
                let enactedTargetFormatted = Localizer.formatQuantity(enactedTarget)

                // Compare formatted values to avoid issues with minor floating-point differences
                // Profile target could be in another unit than enacted target
                if profileTargetHighFormatted != enactedTargetFormatted {
                    infoManager.updateInfoData(type: .target, firstValue: profileTargetHigh, secondValue: enactedTarget, separator: .arrow)
                } else {
                    infoManager.updateInfoData(type: .target, value: profileTargetHigh)
                }
                let effectiveMgdl = enactedTarget.doubleValue(for: .milligramsPerDeciliter)
                Storage.shared.lastTargetLowMgdl.value = effectiveMgdl
                Storage.shared.lastTargetHighMgdl.value = effectiveMgdl
            } else if let profileTargetHigh = profileTargetHigh {
                let profileMgdl = profileTargetHigh.doubleValue(for: .milligramsPerDeciliter)
                Storage.shared.lastTargetLowMgdl.value = profileMgdl
                Storage.shared.lastTargetHighMgdl.value = profileMgdl
            }

            // TDD
            if let tddMetric = InsulinMetric(from: enactedOrSuggested, key: "TDD")
                ?? InsulinMetric(from: lastLoopRecord["enacted"], key: "TDD")
            {
                infoManager.updateInfoData(type: .tdd, value: tddMetric)
                Storage.shared.lastTdd.value = tddMetric.value
            }

            let predBGsData: [String: AnyObject]? = {
                if let enacted = lastLoopRecord["suggested"] as? [String: AnyObject],
                   let predBGs = enacted["predBGs"] as? [String: AnyObject]
                {
                    return predBGs
                } else if let suggested = lastLoopRecord["enacted"] as? [String: AnyObject],
                          let predBGs = suggested["predBGs"] as? [String: AnyObject]
                {
                    return predBGs
                }
                return nil
            }()

            Observable.shared.predictionColor.value = .gray
            topPredictionBG = Storage.shared.minBGScale.value

            if let predbgdata = predBGsData {
                let toLoad = Int(Storage.shared.predictionToLoad.value * 12)
                var rawPredBGs = [String: [Double]]()
                var minPredBG = Double.infinity
                var maxPredBG = -Double.infinity

                for type in ["ZT", "IOB", "COB", "UAM"] {
                    if let arr = predbgdata[type] as? [Double], !arr.isEmpty {
                        rawPredBGs[type] = arr
                        for i in 0 ... min(toLoad, arr.count - 1) {
                            minPredBG = min(minPredBG, arr[i])
                            maxPredBG = max(maxPredBG, arr[i])
                        }
                    }
                }

                openAPSPredBGs = rawPredBGs.isEmpty ? nil : rawPredBGs
                openAPSPredUpdatedTime = updatedTime

                if minPredBG != Double.infinity, maxPredBG != -Double.infinity {
                    let value = "\(Localizer.toDisplayUnits(String(minPredBG)))/\(Localizer.toDisplayUnits(String(maxPredBG)))"
                    infoManager.updateInfoData(type: .minMax, value: value)
                    Storage.shared.lastMinBgMgdl.value = minPredBG
                    Storage.shared.lastMaxBgMgdl.value = maxPredBG
                } else {
                    infoManager.clearInfoData(type: .minMax)
                }

                updateOpenAPSPredictionDisplay()
            } else {
                openAPSPredBGs = nil
                openAPSPredUpdatedTime = nil
            }

            if let loopStatus = lastLoopRecord["recommendedTempBasal"] as? [String: AnyObject] {
                if let tempBasalTime = formatter.date(from: (loopStatus["timestamp"] as! String))?.timeIntervalSince1970 {
                    var lastBGTime = updatedTime ?? Date().timeIntervalSince1970
                    if bgData.count > 0 {
                        lastBGTime = bgData[bgData.count - 1].date
                    }
                    if tempBasalTime > lastBGTime {
                        Observable.shared.loopStatusText.value = "⏀"
                        latestLoopStatusString = "⏀"
                    } else {
                        Observable.shared.loopStatusText.value = "↻"
                        latestLoopStatusString = "↻"
                    }
                }
            } else {
                Observable.shared.loopStatusText.value = "↻"
                latestLoopStatusString = "↻"
            }

            // Live Activity storage
            Storage.shared.lastIOB.value = latestIOB?.value
            Storage.shared.lastCOB.value = latestCOB?.value
        }
    }
}