Add log view, manual transfer

TempTrack.xcodeproj/project.pbxproj

@@ -38,6 +38,9 @@
 		88CDE07E2A28AFF400114294 /* DeviceInfoView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88CDE07D2A28AFF400114294 /* DeviceInfoView.swift */; };
 		E253A9222A2B39B700EC6B28 /* Color+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = E253A9212A2B39B700EC6B28 /* Color+Extensions.swift */; };
 		E253A9242A2B462500EC6B28 /* TemperatureHistoryChart.swift in Sources */ = {isa = PBXBuildFile; fileRef = E253A9232A2B462500EC6B28 /* TemperatureHistoryChart.swift */; };
+		E2A553F92A399F58005204C3 /* Log.swift in Sources */ = {isa = PBXBuildFile; fileRef = E2A553F82A399F58005204C3 /* Log.swift */; };
+		E2A553FB2A39C82D005204C3 /* LogView.swift in Sources */ = {isa = PBXBuildFile; fileRef = E2A553FA2A39C82D005204C3 /* LogView.swift */; };
+		E2A553FD2A39C86B005204C3 /* LogEntry.swift in Sources */ = {isa = PBXBuildFile; fileRef = E2A553FC2A39C86B005204C3 /* LogEntry.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -71,6 +74,9 @@
 		88CDE07D2A28AFF400114294 /* DeviceInfoView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = DeviceInfoView.swift; sourceTree = "<group>"; };
 		E253A9212A2B39B700EC6B28 /* Color+Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Color+Extensions.swift"; sourceTree = "<group>"; };
 		E253A9232A2B462500EC6B28 /* TemperatureHistoryChart.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TemperatureHistoryChart.swift; sourceTree = "<group>"; };
+		E2A553F82A399F58005204C3 /* Log.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Log.swift; sourceTree = "<group>"; };
+		E2A553FA2A39C82D005204C3 /* LogView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LogView.swift; sourceTree = "<group>"; };
+		E2A553FC2A39C86B005204C3 /* LogEntry.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = LogEntry.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -91,6 +97,8 @@
 			children = (
 				88404DDA2A2F4DCA00D30244 /* MeasurementDailyCount.swift */,
 				88CDE0672A2698B400114294 /* TemperatureStorage.swift */,
+				E2A553F82A399F58005204C3 /* Log.swift */,
+				E2A553FC2A39C86B005204C3 /* LogEntry.swift */,
 			);
 			path = Storage;
 			sourceTree = "<group>";
@@ -169,6 +177,7 @@
 				88404DD72A2F381B00D30244 /* HistoryList.swift */,
 				88404DDC2A2F587400D30244 /* HistoryListRow.swift */,
 				88404DDE2A2F68E100D30244 /* TemperatureDayOverview.swift */,
+				E2A553FA2A39C82D005204C3 /* LogView.swift */,
 			);
 			path = Views;
 			sourceTree = "<group>";
@@ -281,6 +290,8 @@
 				88CDE0762A28AF0900114294 /* TemperatureValue.swift in Sources */,
 				88404DE32A31F20E00D30244 /* Int+Extensions.swift in Sources */,
 				88CDE07B2A28AF5100114294 /* BluetoothRequest.swift in Sources */,
+				E2A553FD2A39C86B005204C3 /* LogEntry.swift in Sources */,
+				E2A553F92A399F58005204C3 /* Log.swift in Sources */,
 				E253A9242A2B462500EC6B28 /* TemperatureHistoryChart.swift in Sources */,
 				88404DD22A2F0D8F00D30244 /* Double+Extensions.swift in Sources */,
 				E253A9222A2B39B700EC6B28 /* Color+Extensions.swift in Sources */,
@@ -288,6 +299,7 @@
 				88CDE0742A28AEE500114294 /* DeviceManagerDelegate.swift in Sources */,
 				88404DEB2A37BE3000D30244 /* DeviceWakeCause.swift in Sources */,
 				88CDE06D2A28A92000114294 /* DeviceInfo.swift in Sources */,
+				E2A553FB2A39C82D005204C3 /* LogView.swift in Sources */,
 				88404DD82A2F381B00D30244 /* HistoryList.swift in Sources */,
 				88CDE07E2A28AFF400114294 /* DeviceInfoView.swift in Sources */,
 				88404DDD2A2F587400D30244 /* HistoryListRow.swift in Sources */,

TempTrack.xcodeproj/project.xcworkspace/xcshareddata/swiftpm/Package.resolved

@@ -14,8 +14,8 @@
       "kind" : "remoteSourceControl",
       "location" : "https://github.com/SFSafeSymbols/SFSafeSymbols",
       "state" : {
-        "revision" : "2bcd249b49178247e6b52bac7d67d6e338a40cee",
+        "revision" : "7cca2d60925876b5953a2cf7341cd80fbeac983c",
-        "version" : "4.1.0"
+        "version" : "4.1.1"
       }
     }
   ],

TempTrack/Bluetooth/BluetoothClient.swift

@@ -10,6 +10,17 @@ final class BluetoothClient: ObservableObject {
     private let connection = DeviceManager()
 
     private let storage: TemperatureStorage
+
+    var hasInfo: Bool {
+        deviceInfo != nil
+    }
+
+    var isConnected: Bool {
+        if case .configured = deviceState {
+            return true
+        }
+        return false
+    }
     
     init(storage: TemperatureStorage, deviceInfo: DeviceInfo? = nil) {
         self.storage = storage
@@ -24,7 +35,7 @@ final class BluetoothClient: ObservableObject {
     @Published
     private(set) var deviceState: DeviceState = .disconnected {
         didSet {
-            print("State: \(deviceState)")
+            log.info("State: \(deviceState)")
             if case .configured = deviceState {
                 startRegularUpdates()
             } else {
@@ -37,7 +48,7 @@ final class BluetoothClient: ObservableObject {
     private(set) var deviceInfo: DeviceInfo? {
         didSet {
             updateDeviceTimeIfNeeded()
-            collectRecordedData()
+            // collectRecordedData()
             if let deviceInfo, let runningTransfer {
                 runningTransfer.update(info: deviceInfo)
                 let next = runningTransfer.nextRequest()
@@ -68,7 +79,7 @@ final class BluetoothClient: ObservableObject {
         guard dataUpdateTimer == nil else {
             return
         }
-        print("Starting updates")
+        log.info("Starting updates")
         dataUpdateTimer = Timer.scheduledTimer(withTimeInterval: updateInterval, repeats: true) { [weak self] timer in
             guard let self = self else {
                 timer.invalidate()
@@ -87,7 +98,7 @@ final class BluetoothClient: ObservableObject {
         dataUpdateTimer.invalidate()
         runningRequest = nil
         self.dataUpdateTimer = nil
-        print("Ending updates")
+        log.info("Ending updates")
     }
     
     // MARK: Requests
@@ -102,7 +113,7 @@ final class BluetoothClient: ObservableObject {
         let next = openRequests.removeFirst()
         
         guard connection.send(next.serialized) else {
-            print("Failed to start request \(next)")
+            log.warning("Failed to start request \(next)")
             performNextRequest()
             return
         }
@@ -115,11 +126,11 @@ final class BluetoothClient: ObservableObject {
         }
         let type = request.byte
         if let runningRequest, runningRequest.byte == type {
-            print("Skipping duplicate request \(request)")
+            log.info("Skipping duplicate request \(request)")
             return
         }
         guard !openRequests.contains(where: { $0.byte == type }) else {
-            print("Skipping duplicate request \(request)")
+            log.info("Skipping duplicate request \(request)")
             return
         }
         openRequests.append(request)
@@ -140,7 +151,7 @@ final class BluetoothClient: ObservableObject {
         }
         let time = deviceInfo.deviceStartTime.seconds
         addRequest(.setDeviceStartTime(deviceStartTimeSeconds: time))
-        print("Setting device start time to \(time) s (\(Date().seconds) current)")
+        log.info("Setting device start time to \(time) s (\(Date().seconds) current)")
     }
     
     // MARK: Data transfer
@@ -148,15 +159,15 @@ final class BluetoothClient: ObservableObject {
     @discardableResult
     func collectRecordedData() -> Bool {
         guard runningTransfer == nil else {
-            print("Transfer already running")
+            log.info("Transfer already running")
             return false
         }
         guard !openRequests.contains(where: { if case .getRecordingData = $0 { return true }; return false }) else {
-            print("Transfer already in scheduled")
+            log.info("Transfer already scheduled")
             return false
         }
         guard let info = deviceInfo else {
-            print("No device info to start transfer")
+            log.warning("No device info to start transfer")
             return false
         }
         guard info.numberOfStoredMeasurements > 0 else {
@@ -166,14 +177,14 @@ final class BluetoothClient: ObservableObject {
         let transfer = TemperatureDataTransfer(info: info)
         runningTransfer = transfer
         let next = transfer.nextRequest()
-        print("Starting transfer")
+        log.info("Starting transfer")
         addRequest(next)
         return true
     }
     
     private func didReceive(data: Data, offset: Int, count: Int) {
         guard let runningTransfer else {
-            print("No running transfer to process device data")
+            log.warning("No running transfer to process device data")
             return // TODO: Start new transfer?
         }
         runningTransfer.add(data: data, offset: offset, count: count)
@@ -183,7 +194,7 @@ final class BluetoothClient: ObservableObject {
     
     private func decode(info: Data) {
         guard let newInfo = try? DeviceInfo(info: info) else {
-            print("Failed to decode device info")
+            log.error("Failed to decode device info")
             return
         }
         self.deviceInfo = newInfo
@@ -197,25 +208,25 @@ extension BluetoothClient: DeviceManagerDelegate {
             performNextRequest()
         }
         guard let runningRequest else {
-            print("No request active, but \(data) received")
+            log.warning("No request active, but \(data) received")
             return
         }
         self.runningRequest = nil
         
         guard data.count > 0 else {
-            print("No response data for request \(runningRequest)")
+            log.error("No response data for request \(runningRequest)")
             return
         }
         
         guard let type = BluetoothResponseType(rawValue: data[0]) else {
-            print("Unknown response \(data[0]) for request \(runningRequest)")
+            log.error("Unknown response \(data[0]) for request \(runningRequest)")
             return
         }
         switch type {
         case .success:
             break
         case .responseInProgress:
-            print("Device is busy for \(runningRequest)")
+            log.info("Device is busy for \(runningRequest)")
             // Retry the request
             addRequest(runningRequest)
             return
@@ -226,7 +237,7 @@ extension BluetoothClient: DeviceManagerDelegate {
                 addRequest(.getInfo)
                 return
             }
-            print("Request \(runningRequest) received non-matching responde about number of bytes to delete")
+            log.error("Request \(runningRequest) received non-matching responde about number of bytes to delete")
         case .responseTooLarge:
             guard case .getRecordingData = runningRequest else {
                 // If requesting bytes fails due to the response size,
@@ -234,9 +245,9 @@ extension BluetoothClient: DeviceManagerDelegate {
                 addRequest(.getInfo)
                 return
             }
-            print("Unexpectedly exceeded payload size for request \(runningRequest)")
+            log.error("Unexpectedly exceeded payload size for request \(runningRequest)")
         default:
-            print("Unknown response \(data[0]) for request \(runningRequest)")
+            log.error("Unknown response \(data[0]) for request \(runningRequest)")
             // If clearing the recording buffer fails due to byte mismatch,
             // then requesting new info will resolve the mismatch, and the transfer will be resumed
             
@@ -255,14 +266,14 @@ extension BluetoothClient: DeviceManagerDelegate {
             didClearDeviceStorage()
 
         case .setDeviceStartTime:
-            print("Device time set")
+            log.info("Device time set")
             break
         }
     }
 
     private func didClearDeviceStorage() {
         guard let runningTransfer else {
-            print("No running transfer after clearing device storage")
+            log.warning("No running transfer after clearing device storage")
             return
         }
         runningTransfer.completeTransfer()

TempTrack/Bluetooth/DeviceManager.swift

@@ -31,7 +31,7 @@ final class DeviceManager: NSObject, CBCentralManagerDelegate {
     func connect() -> Bool {
         switch state {
         case .bluetoothDisabled:
-            print("Can't connect, bluetooth disabled")
+            log.info("Can't connect, bluetooth disabled")
             return false
         case .disconnected, .bluetoothEnabled:
             break
@@ -91,7 +91,6 @@ final class DeviceManager: NSObject, CBCentralManagerDelegate {
     }
 
     func centralManager(_ central: CBCentralManager, didDiscover peripheral: CBPeripheral, advertisementData: [String : Any], rssi RSSI: NSNumber) {
-        //print("Found device '\(peripheral.name ?? "NO_NAME")'")
         peripheral.delegate = self
         manager.connect(peripheral)
         manager.stopScan()
@@ -107,30 +106,30 @@ final class DeviceManager: NSObject, CBCentralManagerDelegate {
             connect()
         case .unsupported:
             state = .bluetoothDisabled
-            print("Bluetooth is not supported")
+            log.info("Bluetooth is not supported")
         case .unknown:
             state = .bluetoothDisabled
-            print("Bluetooth state is unknown")
+            log.info("Bluetooth state is unknown")
         case .resetting:
             state = .bluetoothDisabled
-            print("Bluetooth is resetting")
+            log.info("Bluetooth is resetting")
         case .unauthorized:
             state = .bluetoothDisabled
-            print("Bluetooth is not authorized")
+            log.info("Bluetooth is not authorized")
         @unknown default:
             state = .bluetoothDisabled
-            print("Unknown state \(central.state)")
+            log.warning("Unknown state \(central.state)")
         }
     }
         
     func centralManager(_ central: CBCentralManager, didConnect peripheral: CBPeripheral) {
-        //print("Connected to " +  peripheral.name!)
+        log.info("Connected to " +  peripheral.name!)
         peripheral.discoverServices([DeviceManager.serviceUUID])
         state = .discoveringServices(device: peripheral)
     }
         
     func centralManager(_ central: CBCentralManager, didDisconnectPeripheral peripheral: CBPeripheral, error: Error?) {
-        print("Disconnected from " +  peripheral.name!)
+        log.info("Disconnected from " +  peripheral.name!)
         state = .disconnected
         // Attempt to reconnect
         if shouldConnectIfPossible {
@@ -139,9 +138,9 @@ final class DeviceManager: NSObject, CBCentralManagerDelegate {
     }
     
     func centralManager(_ central: CBCentralManager, didFailToConnect peripheral: CBPeripheral, error: Error?) {
-        print("Failed to connect device '\(peripheral.name ?? "NO_NAME")'")
+        log.warning("Failed to connect device '\(peripheral.name ?? "NO_NAME")'")
         if let error = error {
-            print(error)
+            log.warning(error.localizedDescription)
         }
         state = manager.isScanning ? .scanning : .disconnected
         // Attempt to reconnect
@@ -155,12 +154,12 @@ extension DeviceManager: CBPeripheralDelegate {
     
     func peripheral(_ peripheral: CBPeripheral, didDiscoverServices error: Error?) {
         guard let services = peripheral.services, !services.isEmpty else {
-            print("No services found for device '\(peripheral.name ?? "NO_NAME")'")
+            log.error("No services found for device '\(peripheral.name ?? "NO_NAME")'")
             manager.cancelPeripheralConnection(peripheral)
             return
         }
         guard let service = services.first(where: { $0.uuid.uuidString == DeviceManager.serviceUUID.uuidString }) else {
-            print("Required service not found for '\(peripheral.name ?? "NO_NAME")': \(services.map { $0.uuid.uuidString})")
+            log.error("Required service not found for '\(peripheral.name ?? "NO_NAME")': \(services.map { $0.uuid.uuidString})")
             manager.cancelPeripheralConnection(peripheral)
             return
         }
@@ -170,18 +169,18 @@ extension DeviceManager: CBPeripheralDelegate {
     
     func peripheral(_ peripheral: CBPeripheral, didDiscoverCharacteristicsFor service: CBService, error: Error?) {
         if let error = error {
-            print("Failed to discover characteristics: \(error)")
+            log.error("Failed to discover characteristics: \(error)")
             manager.cancelPeripheralConnection(peripheral)
             return
         }
         guard let characteristics = service.characteristics, !characteristics.isEmpty else {
-            print("No characteristics found for device")
+            log.error("No characteristics found for device")
             manager.cancelPeripheralConnection(peripheral)
             return
         }
         for characteristic in characteristics {
             guard characteristic.uuid == DeviceManager.characteristicUUID else {
-                print("Unused characteristic \(characteristic.uuid.uuidString)")
+                log.warning("Unused characteristic \(characteristic.uuid.uuidString)")
                 continue
             }
             state = .configured(device: peripheral, characteristic: characteristic)
@@ -191,35 +190,34 @@ extension DeviceManager: CBPeripheralDelegate {
     
     func peripheral(_ peripheral: CBPeripheral, didWriteValueFor characteristic: CBCharacteristic, error: Error?) {
         if let error = error {
-            print("Peripheral failed to write value for \(characteristic.uuid.uuidString): \(error)")
+            log.error("Peripheral failed to write value for \(characteristic.uuid.uuidString): \(error)")
         }
-        //print("Peripheral did write value for \(characteristic.uuid.uuidString)")
     }
     
     func peripheral(_ peripheral: CBPeripheral, didReadRSSI RSSI: NSNumber, error: Error?) {
         if let error = error {
-            print("Failed to get RSSI: \(error)")
+            log.warning("Failed to get RSSI: \(error)")
             return
         }
         lastRSSI = RSSI.intValue
-        print("RSSI: \(lastRSSI)")
+        log.info("RSSI: \(lastRSSI)")
     }
     
     func peripheral(_ peripheral: CBPeripheral, didUpdateValueFor characteristic: CBCharacteristic, error: Error?) {
         if let error = error {
-            print("Failed to read value update: \(error)")
+            log.error("Failed to read value update: \(error)")
             return
         }
         guard case .configured(device: _, characteristic: let storedCharacteristic) = state else {
-            print("Received data while not properly configured")
+            log.warning("Received data while not properly configured")
             return
         }
         guard characteristic.uuid == storedCharacteristic.uuid else {
-            print("Read unknown characteristic \(characteristic.uuid.uuidString)")
+            log.warning("Read unknown characteristic \(characteristic.uuid.uuidString)")
             return
         }
         guard let data = characteristic.value else {
-            print("No data")
+            log.warning("No data")
             return
         }
         delegate?.deviceManager(didReceive: data)

TempTrack/ContentView.swift

@@ -23,13 +23,12 @@ struct ContentView: View {
     @State
     var showHistory = false
 
+    @State
+    var showLog = false
+
     init() {
         
     }
-
-    var hasDeviceInfo: Bool {
-        bluetoothClient.deviceInfo != nil
-    }
     
     var averageTemperature: Double? {
         let t1 = bluetoothClient.deviceInfo?.sensor1?.optionalValue
@@ -110,17 +109,33 @@ struct ContentView: View {
                     .cornerRadius(8)
             }
             HStack(alignment: .center) {
+                Button {
+                    self.showLog.toggle()
+                } label: {
+                    Image(systemSymbol: .textBubble)
+                        .font(.system(size: 30, weight: .light))
+                        .foregroundColor(.white)
+                }
+                Spacer()
                 Button {
                     self.showDeviceInfo = true
                 } label: {
-                    if hasDeviceInfo {
+                    if bluetoothClient.hasInfo {
                         Image(systemSymbol: .iphone)
-                            .font(.system(size: 30, weight: .regular))
+                            .font(.system(size: 30, weight: .light))
                     }
                     Text(bluetoothClient.deviceState.text)
                 }
-                .disabled(!hasDeviceInfo)
+                .disabled(!bluetoothClient.hasInfo)
                 .foregroundColor(.white)
+                Spacer()
+                Button {
+                    bluetoothClient.collectRecordedData()
+                } label: {
+                    Image(systemSymbol: .arrowUpArrowDownCircle)
+                        .font(.system(size: 30, weight: .light))
+                        .foregroundColor(.white)
+                }.disabled(!bluetoothClient.isConnected)
 
             }.padding()
         }
@@ -136,6 +151,10 @@ struct ContentView: View {
             HistoryList()
                 .environmentObject(storage)
         }
+        .sheet(isPresented: $showLog) {
+            LogView()
+                .environmentObject(log)
+        }
         .background(backgroundGradient)
     }
 }

TempTrack/Storage/Log.swift

@@ -0,0 +1,48 @@
+import Foundation
+
+let log = Log()
+
+final class Log: ObservableObject {
+
+    private let df: DateFormatter
+
+    init() {
+        df = .init()
+        df.dateStyle = .short
+        df.timeStyle = .medium
+    }
+
+    enum Level: String {
+        case info = "INFO"
+        case warning = "WARN"
+        case error = "ERROR"
+    }
+
+    @Published
+    var logEntries: [LogEntry] = []
+
+    func info(_ message: String) {
+        log(.info, message)
+    }
+
+    func warning(_ message: String) {
+        log(.warning, message)
+    }
+
+    func error(_ message: String) {
+        log(.error, message)
+    }
+
+    func log(_ level: Level, _ message: String) {
+        let entry = LogEntry(level: level, message: message)
+        logEntries.insert(entry, at: 0)
+        print(entry)
+    }
+}
+
+extension Log.Level: CustomStringConvertible {
+
+    var description: String {
+        rawValue
+    }
+}

TempTrack/Storage/LogEntry.swift

@@ -0,0 +1,33 @@
+import Foundation
+
+struct LogEntry: Identifiable {
+
+    let id: TimeInterval
+
+    let date: Date
+
+    let level: Log.Level
+
+    let message: String
+
+    init(date: Date = Date(), level: Log.Level, message: String) {
+        self.id = date.timeIntervalSince1970
+        self.date = date
+        self.level = level
+        self.message = message
+    }
+}
+
+private let df: DateFormatter = {
+    let df = DateFormatter()
+    df.dateStyle = .short
+    df.timeStyle = .medium
+    return df
+}()
+
+extension LogEntry: CustomStringConvertible {
+
+    var description: String {
+        "[\(df.string(from: date))][\(level.rawValue)] \(message)"
+    }
+}

TempTrack/Storage/TemperatureStorage.swift

@@ -57,6 +57,7 @@ final class TemperatureStorage: ObservableObject {
         
         if lastMeasurements.isEmpty {
             loadLastMeasurements()
+            loadDailyCounts()
         } else {
             setDailyCounts(from: lastMeasurements)
         }
@@ -71,7 +72,7 @@ final class TemperatureStorage: ObservableObject {
         do {
             try fm.createDirectory(at: storageFolder, withIntermediateDirectories: true)
         } catch {
-            print("Failed to create folder: \(error)")
+            log.error("Failed to create folder: \(error)")
         }
     }
     
@@ -99,17 +100,20 @@ final class TemperatureStorage: ObservableObject {
         let dateIndexOfStart = startDate.dateIndex
         guard todayIndex != dateIndexOfStart else {
             recentMeasurements = todayValues
+            log.info("Loaded \(recentMeasurements.count) recent measurements")
             return
         }
         let yesterdayValues = loadMeasurements(for: dateIndexOfStart)
             .filter { $0.date >= startDate }
         recentMeasurements = yesterdayValues + todayValues
+        log.info("Loaded \(recentMeasurements.count) recent measurements")
     }
 
     private func updateLastMeasurements(_ measurements: [TemperatureMeasurement]) {
         let startDate = Date().addingTimeInterval(-lastValueInterval).seconds
         let new = recentMeasurements + measurements
         recentMeasurements = Array(new.drop { $0.id < startDate })
+        log.info("\(recentMeasurements.count) recent measurements (of \(measurements.count) new entries)")
     }
     
     private func loadMeasurements(for date: Date) -> [TemperatureMeasurement] {
@@ -123,30 +127,30 @@ final class TemperatureStorage: ObservableObject {
     private func loadMeasurements(from fileName: String) -> [TemperatureMeasurement] {
         let fileUrl = fileUrl(for: fileName)
         guard fm.fileExists(atPath: fileUrl.path) else {
-            print("No measurements for \(fileName)")
+            log.info("No measurements for \(fileName)")
             return []
         }
         do {
             let content = try Data(contentsOf: fileUrl)
             let points: [TemperatureMeasurement] = try BinaryDecoder.decode(from: content)
-            print("Loaded \(points.count) points for \(fileName)")
+            log.info("Loaded \(points.count) points from \(fileName)")
             return points
         } catch {
-            print("Failed to read file \(fileName): \(error)")
+            log.error("Failed to read file \(fileName): \(error)")
             return []
         }
     }
 
     func add(_ measurements: [TemperatureMeasurement]) {
         let lastDate = self.newestMeasurementDate.seconds
-        let newValues = measurements
+        let newerValues = measurements.filter { $0.id > lastDate }
-            .filter { $0.id > lastDate }
+        let newValues = newerValues.splitByDate()
-            .splitByDate()
+        log.info("Adding \(newValues.count) of \(measurements.count) measurements")
 
         for (dateIndex, values) in newValues {
             let count = saveNew(values, for: dateIndex)
             setDailyCount(count, for: dateIndex)
-            print("Day \(dateIndex): \(count) values")
+            //log.info("Day \(dateIndex): \(count) values")
         }
         saveDailyCounts()
         updateLastMeasurements(measurements)
@@ -155,7 +159,7 @@ final class TemperatureStorage: ObservableObject {
     func removeMeasurements(for dateIndex: Int) {
         let fileUrl = fileUrl(for: dateIndex)
         guard fm.fileExists(atPath: fileUrl.path) else {
-            print("No measurements for \(fileUrl.lastPathComponent)")
+            log.warning("No measurements for \(fileUrl.lastPathComponent)")
             return
         }
         do {
@@ -163,7 +167,7 @@ final class TemperatureStorage: ObservableObject {
             dailyMeasurementCounts = dailyMeasurementCounts.filter { $0.dateIndex != dateIndex }
             recentMeasurements = recentMeasurements.filter { $0.date.dateIndex != dateIndex }
         } catch {
-            print("Failed to delete \(fileUrl.lastPathComponent): \(error)")
+            log.error("Failed to delete \(fileUrl.lastPathComponent): \(error)")
         }
     }
     
@@ -183,7 +187,7 @@ final class TemperatureStorage: ObservableObject {
             let data = try BinaryEncoder.encode(measurements.sorted())
             try data.write(to: fileUrl)
         } catch {
-            print("Failed to save \(fileName): \(error)")
+            log.error("Failed to save \(fileName): \(error)")
         }
     }
     
@@ -219,7 +223,7 @@ final class TemperatureStorage: ObservableObject {
             let data = try Data(contentsOf: overviewFileUrl)
             dailyMeasurementCounts = try BinaryDecoder.decode(from: data)
         } catch {
-            print("Failed to load overview: \(error)")
+            log.error("Failed to load overview: \(error)")
         }
     }
     
@@ -228,7 +232,7 @@ final class TemperatureStorage: ObservableObject {
             let data = try BinaryEncoder.encode(dailyMeasurementCounts)
             try data.write(to: overviewFileUrl)
         } catch {
-            print("Failed to write overview: \(error)")
+            log.error("Failed to write overview: \(error)")
         }
     }
     
@@ -242,9 +246,12 @@ final class TemperatureStorage: ObservableObject {
     
     func recalculateDailyCounts() {
         do {
-            let newValues: [Int: Int] = try fm.contentsOfDirectory(atPath: storageFolder.path)
+            let files = try fm.contentsOfDirectory(atPath: storageFolder.path)
+            let newValues: [Int: Int] = files
                 .reduce(into: [:]) { counts, fileName in
-                    guard let dateIndex = Int(fileName) else {
+                    let dateString = fileName.replacingOccurrences(of: ".bin", with: "")
+                    guard let dateIndex = Int(dateString) else {
+                        log.warning("Found file with invalid name \(fileName)")
                         return
                     }
                     counts[dateIndex] = loadMeasurements(from: fileName).count
@@ -253,9 +260,10 @@ final class TemperatureStorage: ObservableObject {
                 self.dailyMeasurementCounts = newValues
                     .map { .init(dateIndex: $0.key, count: $0.value) }
                     .sorted()
+                log.info("Daily counts recalculated from \(files.count) files")
             }
         } catch {
-            print("Failed to load daily counts: \(error)")
+            log.error("Failed to load daily counts: \(error)")
         }
     }
     

TempTrack/Temperature/TemperatureDataTransfer.swift

@@ -56,7 +56,7 @@ final class TemperatureDataTransfer {
     
     func add(data: Data, offset: Int, count: Int) {
         guard currentByteIndex == offset else {
-            print("Discarding \(data.count) bytes at offset \(offset), expected \(currentByteIndex)")
+            log.warning("Discarding \(data.count) bytes at offset \(offset), expected \(currentByteIndex)")
             return
         }
         dataBuffer.append(data)

TempTrack/Views/LogView.swift

@@ -0,0 +1,35 @@
+import SwiftUI
+
+struct LogView: View {
+
+    @EnvironmentObject
+    var log: Log
+
+    private let df: DateFormatter = {
+        let df = DateFormatter()
+        df.dateStyle = .short
+        df.timeStyle = .medium
+        return df
+    }()
+
+    var body: some View {
+        List(log.logEntries) { entry in
+            VStack(alignment: .leading) {
+                HStack {
+                    Text(entry.level.description)
+                    Spacer()
+                    Text(df.string(from: entry.date))
+                }.font(.footnote)
+                Text(entry.message)
+            }
+        }
+
+    }
+}
+
+struct LogView_Previews: PreviewProvider {
+    static var previews: some View {
+        LogView()
+            .environmentObject(Log())
+    }
+}

TempTrack/Views/TemperatureDayOverview.swift

@@ -11,7 +11,6 @@ struct TemperatureDayOverview: View {
     init(storage: TemperatureStorage, dateIndex: Int) {
         self.storage = storage
         let points = storage.loadMeasurements(for: dateIndex)
-        print("Loaded \(points.count) points for date \(dateIndex)")
         self.points = points
         update()
     }