Add basic storage, temperature history display

TempTrack.xcodeproj/project.pbxproj

@@ -7,6 +7,13 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
+		88404DD02A2E718B00D30244 /* BinaryCodable in Frameworks */ = {isa = PBXBuildFile; productRef = 88404DCF2A2E718B00D30244 /* BinaryCodable */; };
+		88404DD22A2F0D8F00D30244 /* Double+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88404DD12A2F0D8F00D30244 /* Double+Extensions.swift */; };
+		88404DD42A2F0DB100D30244 /* Date+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88404DD32A2F0DB100D30244 /* Date+Extensions.swift */; };
+		88404DD82A2F381B00D30244 /* HistoryList.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88404DD72A2F381B00D30244 /* HistoryList.swift */; };
+		88404DDB2A2F4DCA00D30244 /* MeasurementDailyCount.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88404DDA2A2F4DCA00D30244 /* MeasurementDailyCount.swift */; };
+		88404DDD2A2F587400D30244 /* HistoryListRow.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88404DDC2A2F587400D30244 /* HistoryListRow.swift */; };
+		88404DDF2A2F68E100D30244 /* TemperatureDayOverview.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88404DDE2A2F68E100D30244 /* TemperatureDayOverview.swift */; };
 		88CDE04F2A2508E900114294 /* TempTrackApp.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88CDE04E2A2508E900114294 /* TempTrackApp.swift */; };
 		88CDE0512A2508E900114294 /* ContentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 88CDE0502A2508E900114294 /* ContentView.swift */; };
 		88CDE0532A2508EA00114294 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 88CDE0522A2508EA00114294 /* Assets.xcassets */; };
@@ -32,6 +39,12 @@
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
+		88404DD12A2F0D8F00D30244 /* Double+Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Double+Extensions.swift"; sourceTree = "<group>"; };
+		88404DD32A2F0DB100D30244 /* Date+Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "Date+Extensions.swift"; sourceTree = "<group>"; };
+		88404DD72A2F381B00D30244 /* HistoryList.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HistoryList.swift; sourceTree = "<group>"; };
+		88404DDA2A2F4DCA00D30244 /* MeasurementDailyCount.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MeasurementDailyCount.swift; sourceTree = "<group>"; };
+		88404DDC2A2F587400D30244 /* HistoryListRow.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = HistoryListRow.swift; sourceTree = "<group>"; };
+		88404DDE2A2F68E100D30244 /* TemperatureDayOverview.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TemperatureDayOverview.swift; sourceTree = "<group>"; };
 		88CDE04B2A2508E900114294 /* TempTrack.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = TempTrack.app; sourceTree = BUILT_PRODUCTS_DIR; };
 		88CDE04E2A2508E900114294 /* TempTrackApp.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TempTrackApp.swift; sourceTree = "<group>"; };
 		88CDE0502A2508E900114294 /* ContentView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContentView.swift; sourceTree = "<group>"; };
@@ -59,6 +72,7 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				88404DD02A2E718B00D30244 /* BinaryCodable in Frameworks */,
 				E253A9272A2CA48A00EC6B28 /* SQLite in Frameworks */,
 				88CDE0662A25D08F00114294 /* SFSafeSymbols in Frameworks */,
 				88CDE06B2A2899C900114294 /* BottomSheet in Frameworks */,
@@ -68,6 +82,15 @@
 /* End PBXFrameworksBuildPhase section */
 
 /* Begin PBXGroup section */
+		88404DD92A2F4DB100D30244 /* Storage */ = {
+			isa = PBXGroup;
+			children = (
+				88404DDA2A2F4DCA00D30244 /* MeasurementDailyCount.swift */,
+				88CDE0672A2698B400114294 /* TemperatureStorage.swift */,
+			);
+			path = Storage;
+			sourceTree = "<group>";
+		};
 		88CDE0422A2508E800114294 = {
 			isa = PBXGroup;
 			children = (
@@ -92,10 +115,10 @@
 				E253A9202A2B39A700EC6B28 /* Extensions */,
 				88CDE07C2A28AFE700114294 /* Views */,
 				88CDE0792A28AF3E00114294 /* Bluetooth */,
+				88404DD92A2F4DB100D30244 /* Storage */,
 				88CDE06E2A28AE8D00114294 /* Temperature */,
 				88CDE0522A2508EA00114294 /* Assets.xcassets */,
 				88CDE0542A2508EA00114294 /* Preview Content */,
-				88CDE0672A2698B400114294 /* TemperatureStorage.swift */,
 				88CDE06C2A28A92000114294 /* DeviceInfo.swift */,
 			);
 			path = TempTrack;
@@ -138,6 +161,9 @@
 			children = (
 				88CDE07D2A28AFF400114294 /* DeviceInfoView.swift */,
 				E253A9232A2B462500EC6B28 /* TemperatureHistoryChart.swift */,
+				88404DD72A2F381B00D30244 /* HistoryList.swift */,
+				88404DDC2A2F587400D30244 /* HistoryListRow.swift */,
+				88404DDE2A2F68E100D30244 /* TemperatureDayOverview.swift */,
 			);
 			path = Views;
 			sourceTree = "<group>";
@@ -146,6 +172,8 @@
 			isa = PBXGroup;
 			children = (
 				E253A9212A2B39B700EC6B28 /* Color+Extensions.swift */,
+				88404DD12A2F0D8F00D30244 /* Double+Extensions.swift */,
+				88404DD32A2F0DB100D30244 /* Date+Extensions.swift */,
 			);
 			path = Extensions;
 			sourceTree = "<group>";
@@ -170,6 +198,7 @@
 				88CDE0652A25D08F00114294 /* SFSafeSymbols */,
 				88CDE06A2A2899C900114294 /* BottomSheet */,
 				E253A9262A2CA48A00EC6B28 /* SQLite */,
+				88404DCF2A2E718B00D30244 /* BinaryCodable */,
 			);
 			productName = TempTrack;
 			productReference = 88CDE04B2A2508E900114294 /* TempTrack.app */;
@@ -203,6 +232,7 @@
 				88CDE0642A25D08F00114294 /* XCRemoteSwiftPackageReference "SFSafeSymbols" */,
 				88CDE0692A2899C900114294 /* XCRemoteSwiftPackageReference "bottom-sheet" */,
 				E253A9252A2CA48900EC6B28 /* XCRemoteSwiftPackageReference "SQLite" */,
+				88404DCE2A2E718B00D30244 /* XCRemoteSwiftPackageReference "BinaryCodable" */,
 			);
 			productRefGroup = 88CDE04C2A2508E900114294 /* Products */;
 			projectDirPath = "";
@@ -230,23 +260,29 @@
 			isa = PBXSourcesBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
+				88404DDB2A2F4DCA00D30244 /* MeasurementDailyCount.swift in Sources */,
 				88CDE0512A2508E900114294 /* ContentView.swift in Sources */,
 				88CDE05F2A250F5200114294 /* DeviceState.swift in Sources */,
 				88CDE0632A253AD900114294 /* TemperatureDataTransfer.swift in Sources */,
 				88CDE0702A28AEA300114294 /* TemperatureMeasurement.swift in Sources */,
 				88CDE05D2A250F3C00114294 /* DeviceManager.swift in Sources */,
+				88404DDF2A2F68E100D30244 /* TemperatureDayOverview.swift in Sources */,
 				88CDE04F2A2508E900114294 /* TempTrackApp.swift in Sources */,
 				88CDE0722A28AEB900114294 /* TemperatureDataTransferDelegate.swift in Sources */,
 				88CDE0782A28AF2C00114294 /* TemperatureSensor.swift in Sources */,
 				88CDE0682A2698B400114294 /* TemperatureStorage.swift in Sources */,
+				88404DD42A2F0DB100D30244 /* Date+Extensions.swift in Sources */,
 				88CDE0762A28AF0900114294 /* TemperatureValue.swift in Sources */,
 				88CDE07B2A28AF5100114294 /* BluetoothRequest.swift in Sources */,
 				E253A9242A2B462500EC6B28 /* TemperatureHistoryChart.swift in Sources */,
+				88404DD22A2F0D8F00D30244 /* Double+Extensions.swift in Sources */,
 				E253A9222A2B39B700EC6B28 /* Color+Extensions.swift in Sources */,
 				88CDE0612A25108100114294 /* BluetoothClient.swift in Sources */,
 				88CDE0742A28AEE500114294 /* DeviceManagerDelegate.swift in Sources */,
 				88CDE06D2A28A92000114294 /* DeviceInfo.swift in Sources */,
+				88404DD82A2F381B00D30244 /* HistoryList.swift in Sources */,
 				88CDE07E2A28AFF400114294 /* DeviceInfoView.swift in Sources */,
+				88404DDD2A2F587400D30244 /* HistoryListRow.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -453,6 +489,14 @@
 /* End XCConfigurationList section */
 
 /* Begin XCRemoteSwiftPackageReference section */
+		88404DCE2A2E718B00D30244 /* XCRemoteSwiftPackageReference "BinaryCodable" */ = {
+			isa = XCRemoteSwiftPackageReference;
+			repositoryURL = "https://github.com/christophhagen/BinaryCodable";
+			requirement = {
+				kind = upToNextMajorVersion;
+				minimumVersion = 2.0.0;
+			};
+		};
 		88CDE0642A25D08F00114294 /* XCRemoteSwiftPackageReference "SFSafeSymbols" */ = {
 			isa = XCRemoteSwiftPackageReference;
 			repositoryURL = "https://github.com/SFSafeSymbols/SFSafeSymbols";
@@ -480,6 +524,11 @@
 /* End XCRemoteSwiftPackageReference section */
 
 /* Begin XCSwiftPackageProductDependency section */
+		88404DCF2A2E718B00D30244 /* BinaryCodable */ = {
+			isa = XCSwiftPackageProductDependency;
+			package = 88404DCE2A2E718B00D30244 /* XCRemoteSwiftPackageReference "BinaryCodable" */;
+			productName = BinaryCodable;
+		};
 		88CDE0652A25D08F00114294 /* SFSafeSymbols */ = {
 			isa = XCSwiftPackageProductDependency;
 			package = 88CDE0642A25D08F00114294 /* XCRemoteSwiftPackageReference "SFSafeSymbols" */;

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

@@ -1,5 +1,14 @@
 {
   "pins" : [
+    {
+      "identity" : "binarycodable",
+      "kind" : "remoteSourceControl",
+      "location" : "https://github.com/christophhagen/BinaryCodable",
+      "state" : {
+        "revision" : "295ca6399b2b01d1aa4fa84d666416f3bf99ffde",
+        "version" : "2.0.0"
+      }
+    },
     {
       "identity" : "bottom-sheet",
       "kind" : "remoteSourceControl",

TempTrack.xcodeproj/xcuserdata/imac.xcuserdatad/xcschemes/xcschememanagement.plist

@@ -4,10 +4,31 @@
 <dict>
 	<key>SchemeUserState</key>
 	<dict>
+		<key>SQLite (Playground) 1.xcscheme</key>
+		<dict>
+			<key>isShown</key>
+			<false/>
+			<key>orderHint</key>
+			<integer>2</integer>
+		</dict>
+		<key>SQLite (Playground) 2.xcscheme</key>
+		<dict>
+			<key>isShown</key>
+			<false/>
+			<key>orderHint</key>
+			<integer>3</integer>
+		</dict>
+		<key>SQLite (Playground).xcscheme</key>
+		<dict>
+			<key>isShown</key>
+			<false/>
+			<key>orderHint</key>
+			<integer>0</integer>
+		</dict>
 		<key>TempTrack.xcscheme_^#shared#^_</key>
 		<dict>
 			<key>orderHint</key>
-			<integer>0</integer>
+			<integer>1</integer>
 		</dict>
 	</dict>
 </dict>

TempTrack/Bluetooth/BluetoothClient.swift

@@ -18,11 +18,13 @@ enum BluetoothResponseType: UInt8 {
 
 final class BluetoothClient: ObservableObject {
     
+    weak var delegate: TemperatureDataTransferDelegate?
+    
     private let updateInterval = 3.0
     
     private let connection = DeviceManager()
     
-    private let recorder = TemperatureStorage()
+    private var didTransferData = false
     
     init(deviceInfo: DeviceInfo? = nil) {
         connection.delegate = self
@@ -41,12 +43,25 @@ final class BluetoothClient: ObservableObject {
                 startRegularUpdates()
             } else {
                 endRegularUpdates()
+                didTransferData = false
             }
         }
     }
     
     @Published
-    private(set) var deviceInfo: DeviceInfo?
+    private(set) var deviceInfo: DeviceInfo? {
+        didSet {
+            guard !didTransferData, runningTransfer == nil else {
+                return
+            }
+            guard !openRequests.contains(where: { if case .getRecordingData = $0 { return true }; return false }) else {
+                return
+            }
+            guard collectRecordedData() else {
+                return
+            }
+        }
+    }
     
     private var openRequests: [BluetoothRequest] = []
     
@@ -55,9 +70,11 @@ final class BluetoothClient: ObservableObject {
     private var runningTransfer: TemperatureDataTransfer?
     
     func updateDeviceInfo() {
-        if case .configured = deviceState {
+        guard case .configured = deviceState else {
-            addRequest(.getInfo)
+            return
         }
+        addRequest(.getInfo)
+        
     }
     
     private var dataUpdateTimer: Timer?
@@ -118,7 +135,7 @@ final class BluetoothClient: ObservableObject {
         }
         let transfer = TemperatureDataTransfer(info: info)
         runningTransfer = transfer
-        runningTransfer?.delegate = recorder
+        runningTransfer?.delegate = delegate
         let next = transfer.nextRequest()
         addRequest(next)
         return true
@@ -137,6 +154,12 @@ final class BluetoothClient: ObservableObject {
             return // TODO: Start new transfer?
         }
         let next = runningTransfer.nextRequest()
+        if case .clearRecordingBuffer = next {
+            runningTransfer.completeTransfer()
+            self.runningTransfer = nil
+            didTransferData = true
+            return
+        }
         addRequest(next)
     }
     

TempTrack/ContentView.swift

@@ -4,8 +4,6 @@ import BottomSheet
 
 struct ContentView: View {
 
-    private let updateInterval = 1.0
-
     private let minTempColor = Color(hue: 0.624, saturation: 0.5, brightness: 1.0)
     private let minTemperature = -20.0
 
@@ -14,49 +12,29 @@ struct ContentView: View {
 
     private let disconnectedColor = Color(white: 0.8)
 
-    @ObservedObject
+    @EnvironmentObject
-    var client = BluetoothClient()
+    var bluetoothClient: BluetoothClient
 
-    @ObservedObject
+    @EnvironmentObject
-    var storage = TemperatureStorage()
+    var storage: TemperatureStorage
 
     @State
     var showDeviceInfo = false
     
     @State
-    var updateTimer: Timer?
+    var showHistory = false
-
-    @State
-    var updateInfoToggle = true
 
     init() {
-        startRegularUpdates()
-    }
         
-    init(client: BluetoothClient, values: [TemperatureMeasurement]) {
-        self.client = client
-        self.storage = .init(lastMeasurements: values)
-        startRegularUpdates()
-    }
-
-    private func startRegularUpdates() {
-        guard updateTimer == nil else {
-            return
-        }
-        updateTimer = Timer.scheduledTimer(withTimeInterval: updateInterval, repeats: true) { timer in
-            self.updateInfoToggle.toggle()
-        }
-
-        updateTimer?.fire()
     }
 
     var hasDeviceInfo: Bool {
-        client.deviceInfo != nil
+        bluetoothClient.deviceInfo != nil
     }
     
     var averageTemperature: Double? {
-        let t1 = client.deviceInfo?.sensor1?.optionalValue
+        let t1 = bluetoothClient.deviceInfo?.sensor1?.optionalValue
-        guard let t0 = client.deviceInfo?.sensor0?.optionalValue else {
+        guard let t0 = bluetoothClient.deviceInfo?.sensor0?.optionalValue else {
             return t1
         }
         guard let t1 else {
@@ -123,10 +101,15 @@ struct ContentView: View {
             }
 
             Spacer()
-            TemperatureHistoryChart(points: storage.lastMeasurements)
+            
-                .frame(height: 150)
+            Button {
-                .background(Color.white.opacity(0.1))
+                self.showHistory = true
-                .cornerRadius(8)
+            } label: {
+                TemperatureHistoryChart(points: $storage.recentMeasurements)
+                    .frame(height: 150)
+                    .background(Color.white.opacity(0.1))
+                    .cornerRadius(8)
+            }
             HStack(alignment: .center) {
                 Button {
                     self.showDeviceInfo = true
@@ -135,7 +118,7 @@ struct ContentView: View {
                         Image(systemSymbol: .iphone)
                             .font(.system(size: 30, weight: .regular))
                     }
-                    Text(client.deviceState.text)
+                    Text(bluetoothClient.deviceState.text)
                 }
                 .disabled(!hasDeviceInfo)
                 .foregroundColor(.white)
@@ -144,23 +127,25 @@ struct ContentView: View {
         }
         .padding()
         .bottomSheet(isPresented: $showDeviceInfo, height: 600)  {
-            if let info = client.deviceInfo {
+            if let info = bluetoothClient.deviceInfo {
-                DeviceInfoView(
+                DeviceInfoView(info: info, isPresented: $showDeviceInfo)
-                    info: info,
-                    isPresented: $showDeviceInfo, updateToggle: $updateInfoToggle)
             } else {
                 EmptyView()
             }
         }
+        .sheet(isPresented: $showHistory) {
+            HistoryList()
+                .environmentObject(storage)
+        }
         .background(backgroundGradient)
     }
 }
 
 struct ContentView_Previews: PreviewProvider {
     static var previews: some View {
-        ContentView(
+        ContentView()
-            client: BluetoothClient(deviceInfo: .mock),
+            .environmentObject(TemperatureStorage(lastMeasurements: TemperatureMeasurement.mockData))
-            values: TemperatureMeasurement.mockData)
+            .environmentObject(BluetoothClient(deviceInfo: .mock))
     }
 }
 

TempTrack/DeviceInfo.swift

@@ -13,25 +13,29 @@ struct DeviceInfo {
     /// The interval between measurements (in seconds)
     let measurementInterval: Int
     
-    /// The maximum number of bytes which can be requested
-    let transferBlockSize: Int
-    
-    let deviceStartTime: Date
-    
     let nextMeasurement: Date
     
     let sensor0: TemperatureSensor?
     
     let sensor1: TemperatureSensor?
     
-    let storageSize: Int
+    // MARK: Device time
     
     /**
      The number of seconds the device has been powered on
      */
-    var numberOfSecondsRunning: Int {
+    let numberOfSecondsRunning: Int
-        Int(-deviceStartTime.timeIntervalSinceNow)
+    
-    }
+    let deviceStartTime: Date
+    
+    let hasDeviceStartTimeSet: Bool
+    
+    // MARK: Storage
+    
+    let storageSize: Int
+    
+    /// The maximum number of bytes which can be requested
+    let transferBlockSize: Int
     
     var storageFillRatio: Double {
         Double(numberOfRecordedBytes) / Double(storageSize)
@@ -44,7 +48,7 @@ struct DeviceInfo {
 
 extension DeviceInfo {
     
-    static var size = 38
+    static var size = 42
     
     init?(info: Data) {
         guard info.count == DeviceInfo.size else {
@@ -60,10 +64,18 @@ extension DeviceInfo {
         self.numberOfMeasurements = .init(high: data[7], low: data[6])
         self.transferBlockSize = .init(high: data[9], low: data[8])
         let secondsSincePowerOn = Int(uint32: data[13], data[12], data[11], data[10])
-        self.deviceStartTime = Date().addingTimeInterval(Double(-secondsSincePowerOn))
+        self.numberOfSecondsRunning = secondsSincePowerOn
         self.sensor0 = .init(address: Array(data[16..<24]), valueByte: data[14], secondsAgo: UInt16(high: data[33], low: data[32]))
         self.sensor1 = .init(address: Array(data[24..<32]), valueByte: data[15], secondsAgo: UInt16(high: data[35], low: data[34]))
         self.storageSize = .init(high: data[37], low: data[36])
+        let deviceStartTimeSeconds = Int(uint32: data[41], data[40], data[39], data[38])
+        if deviceStartTimeSeconds != 0 {
+            self.hasDeviceStartTimeSet = true
+            self.deviceStartTime = Date(seconds: deviceStartTimeSeconds)
+        } else {
+            self.hasDeviceStartTimeSet = false
+            self.deviceStartTime = Date(seconds: Date().seconds - secondsSincePowerOn) // Round to nearest second
+        }
     }
 }
 
@@ -93,11 +105,13 @@ extension DeviceInfo {
             numberOfRecordedBytes: 123,
             numberOfMeasurements: 234,
             measurementInterval: 60,
-            transferBlockSize: 180,
-            deviceStartTime: .now.addingTimeInterval(-1000),
             nextMeasurement: .now.addingTimeInterval(5),
             sensor0: .init(address: [0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08], value: .value(21.0), date: .now.addingTimeInterval(-2)),
             sensor1: .init(address: [0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09], value: .value(19.0), date: .now.addingTimeInterval(-4)),
-            storageSize: 10000)
+            numberOfSecondsRunning: 20,
+            deviceStartTime: .now.addingTimeInterval(-1000),
+            hasDeviceStartTimeSet: false,
+            storageSize: 10000,
+            transferBlockSize: 180)
     }
 }

TempTrack/Extensions/Date+Extensions.swift

@@ -0,0 +1,65 @@
+import Foundation
+
+extension Date {
+    
+    var seconds: Int {
+        timeIntervalSince1970.roundedInt
+    }
+    
+    var secondsToNow: Int {
+        -timeIntervalSinceNow.roundedInt
+    }
+    
+    init(seconds: Int) {
+        self.init(timeIntervalSince1970: TimeInterval(seconds))
+    }
+    
+    var timePassedText: String {
+        let secs = secondsToNow
+        guard secs > 1 else {
+            return "Now"
+        }
+        guard secs >= 60 else {
+            return "\(secs) seconds ago"
+        }
+        let minutes = secs / 60
+        guard minutes > 1 else {
+            return "1 minute ago"
+        }
+        guard minutes >= 60 else {
+            return "\(minutes) minutes ago"
+        }
+        let hours = minutes / 60
+        guard hours > 1 else {
+            return "1 hour ago"
+        }
+        guard hours >= 60 else {
+            return "\(hours) hours ago"
+        }
+        let days = hours / 24
+        guard days > 1 else {
+            return "1 day ago"
+        }
+        return "\(days) days ago"
+    }
+    
+    var dateIndex: Int {
+        let components = Calendar.current.dateComponents([.day, .month, .year], from: self)
+        return components.year! * 10000 + components.month! * 100 + components.day!
+    }
+    
+    init(dateIndex: Int) {
+        let year = dateIndex / 10000
+        let month = (dateIndex % 10000) / 100
+        let day = dateIndex % 100
+        self = Calendar.current.date(from: .init(year: year, month: month, day: day))!
+    }
+    
+    var startOfDay: Date {
+        Calendar.current.startOfDay(for: self)
+    }
+    
+    var startOfNextDay: Date {
+        startOfDay.addingTimeInterval(86400)
+    }
+}

TempTrack/Extensions/Double+Extensions.swift

@@ -0,0 +1,8 @@
+import Foundation
+
+extension Double {
+    
+    var roundedInt: Int {
+        Int(rounded())
+    }
+}

TempTrack/Storage/MeasurementDailyCount.swift

@@ -0,0 +1,45 @@
+import Foundation
+
+struct MeasurementDailyCount {
+    
+    var dateIndex: Int
+    
+    var count: Int
+    
+    var date: Date {
+        .init(dateIndex: dateIndex)
+    }
+}
+
+extension MeasurementDailyCount: Codable {
+    
+    init(from decoder: Decoder) throws {
+        var container = try decoder.unkeyedContainer()
+        self.dateIndex = try container.decode(Int.self)
+        self.count = try container.decode(Int.self)
+    }
+    
+    func encode(to encoder: Encoder) throws {
+        var container = encoder.unkeyedContainer()
+        try container.encode(dateIndex)
+        try container.encode(count)
+    }
+}
+
+extension MeasurementDailyCount: Comparable {
+    
+    static func < (lhs: MeasurementDailyCount, rhs: MeasurementDailyCount) -> Bool {
+        lhs.dateIndex < rhs.dateIndex
+    }
+    
+    static func == (lhs: MeasurementDailyCount, rhs: MeasurementDailyCount) -> Bool {
+        lhs.dateIndex == rhs.dateIndex
+    }
+}
+
+extension MeasurementDailyCount: Identifiable {
+    
+    var id: Int {
+        dateIndex
+    }
+}

TempTrack/Storage/TemperatureStorage.swift

@@ -0,0 +1,275 @@
+import Foundation
+import Combine
+import BinaryCodable
+import SwiftUI
+
+final class TemperatureStorage: ObservableObject {
+
+    static var documentDirectory: URL {
+        try! FileManager.default.url(
+        for: .documentDirectory,
+        in: .userDomainMask,
+        appropriateFor: nil, create: true)
+    }
+
+    @Published
+    var recentMeasurements: [TemperatureMeasurement]
+    
+    @Published
+    var dailyMeasurementCounts: [MeasurementDailyCount] = []
+    
+    private var unsavedMeasurements: [TemperatureMeasurement] = []
+    
+    private let fileNameFormatter: DateFormatter
+    
+    private let storageFolder: URL
+    
+    private let overviewFileUrl: URL
+    
+    private let fm: FileManager
+    
+    private let lastValueInterval: TimeInterval
+
+    init(lastMeasurements: [TemperatureMeasurement] = [], lastValueInterval: TimeInterval = 3600) {
+        self.recentMeasurements = lastMeasurements
+        let documentDirectory = TemperatureStorage.documentDirectory
+        self.storageFolder = documentDirectory.appendingPathComponent("measurements")
+        self.overviewFileUrl = documentDirectory.appendingPathComponent("overview.bin")
+        self.fm = .default
+        self.fileNameFormatter = DateFormatter()
+        self.fileNameFormatter.dateFormat = "yyyyMMdd.bin"
+        self.lastValueInterval = lastValueInterval
+        
+        if lastMeasurements.isEmpty {
+            loadLastMeasurements()
+        } else {
+            setDailyCounts(from: lastMeasurements)
+        }
+        
+        ensureExistenceOfFolder()
+    }
+    
+    private func ensureExistenceOfFolder() {
+        guard !fm.fileExists(atPath: storageFolder.path) else {
+            return
+        }
+        do {
+            try fm.createDirectory(at: storageFolder, withIntermediateDirectories: true)
+        } catch {
+            print("Failed to create folder: \(error)")
+        }
+    }
+    
+    private func fileName(for date: Date) -> String {
+        fileNameFormatter.string(from: date)
+    }
+    
+    private func fileName(for index: Int) -> String {
+        String(format: "%08d.bin", index)
+    }
+    
+    private func fileUrl(for fileName: String) -> URL {
+        storageFolder.appendingPathComponent(fileName)
+    }
+    
+    private func loadLastMeasurements() {
+        let startDate = Date().addingTimeInterval(-lastValueInterval)
+        let todayIndex = Date().dateIndex
+        let todayValues = loadMeasurements(for: todayIndex)
+            .filter { $0.date >= startDate }
+        let dateIndexOfStart = startDate.dateIndex
+        guard todayIndex != dateIndexOfStart else {
+            recentMeasurements = todayValues
+            return
+        }
+        let yesterdayValues = loadMeasurements(for: dateIndexOfStart)
+            .filter { $0.date >= startDate }
+        recentMeasurements = yesterdayValues + todayValues
+    }
+    
+    private func loadMeasurements(for date: Date) -> [TemperatureMeasurement] {
+        loadMeasurements(from: fileName(for: date))
+    }
+    
+    func loadMeasurements(for dateIndex: Int) -> [TemperatureMeasurement] {
+        loadMeasurements(from: fileName(for: dateIndex))
+    }
+    
+    private func loadMeasurements(from fileName: String) -> [TemperatureMeasurement] {
+        let fileUrl = fileUrl(for: fileName)
+        guard fm.fileExists(atPath: fileUrl.path) else {
+            print("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)")
+            return points
+        } catch {
+            print("Failed to read file \(fileName): \(error)")
+            return []
+        }
+    }
+    
+    func save() {
+        for (dateIndex, values) in unsavedMeasurements.splitByDate() {
+            let count = saveNew(values, for: dateIndex)
+            print("Day \(dateIndex): \(count) of \(values.count) saved")
+        }
+        unsavedMeasurements = []
+        saveDailyCounts()
+    }
+    
+    /**
+     - Returns: The number of new points
+     */
+    private func saveNew(_ measurements: [TemperatureMeasurement], for dateIndex: Int) -> Int {
+        let fileName = fileName(for: dateIndex)
+        var existing = loadMeasurements(from: fileName)
+        guard !existing.isEmpty else {
+            save(measurements, for: fileName)
+            setDailyCount(measurements.count, for: dateIndex)
+            return measurements.count
+        }
+        var inserted = 0
+        for value in measurements {
+            if existing.insert(value) {
+                inserted += 1
+            }
+        }
+        save(existing, for: fileName)
+        setDailyCount(existing.count, for: dateIndex)
+        return inserted
+    }
+    
+    private func save(_ measurements: [TemperatureMeasurement], for fileName: String) {
+        let fileUrl = fileUrl(for: fileName)
+        do {
+            let data = try BinaryEncoder.encode(measurements.sorted())
+            try data.write(to: fileUrl)
+        } catch {
+            print("Failed to save \(fileName): \(error)")
+        }
+    }
+    
+    // MARK: Daily counts
+    
+    private func setDailyCount(_ count: Int, for dateIndex: Int) {
+        guard let index = dailyMeasurementCounts.firstIndex(where: { $0.dateIndex == dateIndex }) else {
+            add(dailyCount: count, for: dateIndex)
+            return
+        }
+        dailyMeasurementCounts[index].count = count
+    }
+    
+    private func add(dailyCount count: Int, for dateIndex: Int) {
+        let entry = MeasurementDailyCount(dateIndex: dateIndex, count: count)
+        guard let index = dailyMeasurementCounts.firstIndex(where: { $0.dateIndex < dateIndex }) else {
+            dailyMeasurementCounts.append(entry)
+            return
+        }
+        dailyMeasurementCounts.insert(entry, at: index)
+    }
+    
+    private func incrementCount(for dateIndex: Int, by increment: Int = 1) {
+        guard let index = dailyMeasurementCounts.firstIndex(where: { $0.dateIndex == dateIndex }) else {
+            add(dailyCount: increment, for: dateIndex)
+            return
+        }
+        dailyMeasurementCounts[index].count += increment
+    }
+    
+    private func loadDailyCounts() {
+        do {
+            let data = try Data(contentsOf: overviewFileUrl)
+            dailyMeasurementCounts = try BinaryDecoder.decode(from: data)
+        } catch {
+            print("Failed to load overview: \(error)")
+        }
+    }
+    
+    private func saveDailyCounts() {
+        do {
+            let data = try BinaryEncoder.encode(dailyMeasurementCounts)
+            try data.write(to: overviewFileUrl)
+        } catch {
+            print("Failed to write overview: \(error)")
+        }
+    }
+    
+    private func setDailyCounts(from measurements: [TemperatureMeasurement]) {
+        self.dailyMeasurementCounts = measurements.reduce(into: [Int: Int]()) { counts, value in
+            let index = value.date.dateIndex
+            counts[index] = (counts[index] ?? 0) + 1
+        }.map { MeasurementDailyCount(dateIndex: $0.key, count: $0.value) }
+            .sorted()
+    }
+    
+    func recalculateDailyCounts() {
+        do {
+            let newValues: [Int: Int] = try fm.contentsOfDirectory(atPath: storageFolder.path)
+                .reduce(into: [:]) { counts, fileName in
+                    guard let dateIndex = Int(fileName) else {
+                        return
+                    }
+                    counts[dateIndex] = loadMeasurements(from: fileName).count
+                }
+            DispatchQueue.main.async {
+                self.dailyMeasurementCounts = newValues
+                    .map { .init(dateIndex: $0.key, count: $0.value) }
+                    .sorted()
+            }
+        } catch {
+            print("Failed to load daily counts: \(error)")
+        }
+    }
+    
+}
+
+extension TemperatureStorage: TemperatureDataTransferDelegate {
+    
+    func didReceiveRecording(_ measurement: TemperatureMeasurement) {
+        // Add to unsaved measurements
+        if unsavedMeasurements.insert(measurement) {
+            incrementCount(for: measurement.date.dateIndex)
+        }
+        
+        // Add to last measurements
+        recentMeasurements.insert(measurement)
+    }
+    
+    func saveAfterTransfer() {
+        save()
+    }
+}
+
+private extension Array where Element == TemperatureMeasurement {
+    
+    @discardableResult
+    mutating func insert(_ measurement: TemperatureMeasurement) -> Bool {
+        guard !contains(measurement) else {
+            return false
+        }
+        guard let index = self.firstIndex(where: { $0.date > measurement.date }) else {
+            append(measurement)
+            return true
+        }
+        insert(measurement, at: index)
+        return true
+    }
+    
+    func splitByDate() -> [Int : [TemperatureMeasurement]] {
+        reduce(into: [:]) { result, value in
+            let dateIndex = value.date.dateIndex
+            result[dateIndex] = (result[dateIndex] ?? []) + [value]
+        }
+    }
+}
+
+extension TemperatureStorage {
+    
+    static var mock: TemperatureStorage {
+        .init(lastMeasurements: TemperatureMeasurement.mockData)
+    }
+}

TempTrack/TempTrackApp.swift

@@ -1,10 +1,19 @@
 import SwiftUI
 
+let storage = TemperatureStorage()
+let bluetoothClient = BluetoothClient()
+
 @main
 struct TempTrackApp: App {
+    
     var body: some Scene {
         WindowGroup {
             ContentView()
+                .environmentObject(storage)
+                .environmentObject(bluetoothClient)
+                .onAppear {
+                    bluetoothClient.delegate = storage
+                }
         }
     }
 }

TempTrack/Temperature/TemperatureDataTransfer.swift

@@ -78,6 +78,7 @@ final class TemperatureDataTransfer {
     
     func completeTransfer() {
         processBytes()
+        delegate?.saveAfterTransfer()
     }
     
     private func addRelative(byte: UInt8) {
@@ -98,7 +99,7 @@ final class TemperatureDataTransfer {
         if measurement.sensor1.isValid {
             lastRecording.sensor1 = measurement.sensor1
         }
-        lastRecording.date = measurement.date
+        lastRecording.id = measurement.id
         delegate?.didReceiveRecording(measurement)
     }
     

TempTrack/Temperature/TemperatureDataTransferDelegate.swift

@@ -3,4 +3,6 @@ import Foundation
 protocol TemperatureDataTransferDelegate: AnyObject {
     
     func didReceiveRecording(_ measurement: TemperatureMeasurement)
+    
+    func saveAfterTransfer()
 }

TempTrack/Temperature/TemperatureMeasurement.swift

@@ -6,14 +6,87 @@ struct TemperatureMeasurement: Identifiable {
     
     var sensor1: TemperatureValue
     
-    var date: Date
+    var id: Int
 
-    var id: Int {
+    var date: Date {
-        Int(date.timeIntervalSince1970.rounded())
+        get {
+            Date(seconds: id)
+        }
+        set {
+            id = newValue.seconds
+        }
     }
 
-    var secondsAgo: Int {
+    var secondsToNow: Int {
-        Int(date.timeIntervalSinceNow.rounded())
+        Date().seconds - id
+    }
+    
+    var maximumValue: Double? {
+        guard let s0 = sensor0.optionalValue else {
+            return sensor1.optionalValue
+        }
+        guard let s1 = sensor1.optionalValue else {
+            return nil
+        }
+        return max(s0, s1)
+    }
+    
+    var minimumValue: Double? {
+        guard let s0 = sensor0.optionalValue else {
+            return sensor1.optionalValue
+        }
+        guard let s1 = sensor1.optionalValue else {
+            return nil
+        }
+        return min(s0, s1)
+    }
+}
+
+extension TemperatureMeasurement {
+    
+    init(sensor0: TemperatureValue, sensor1: TemperatureValue, date: Date) {
+        self.sensor0 = sensor0
+        self.sensor1 = sensor1
+        self.id = date.seconds
+    }
+}
+
+extension TemperatureMeasurement: Codable {
+    
+    init(from decoder: Decoder) throws {
+        var container = try decoder.unkeyedContainer()
+        self.sensor0 = .init(byte: try container.decode(UInt8.self))
+        self.sensor1 = .init(byte: try container.decode(UInt8.self))
+        self.id = try container.decode(Int.self)
+    }
+    
+    func encode(to encoder: Encoder) throws {
+        var container = encoder.unkeyedContainer()
+        try container.encode(sensor0.byte)
+        try container.encode(sensor1.byte)
+        try container.encode(id)
+    }
+}
+
+extension TemperatureMeasurement: Comparable {
+    
+    static func < (lhs: TemperatureMeasurement, rhs: TemperatureMeasurement) -> Bool {
+        lhs.id < rhs.id
+    }
+    
+    static func == (lhs: TemperatureMeasurement, rhs: TemperatureMeasurement) -> Bool {
+        lhs.id == rhs.id
+    }
+}
+
+extension Array where Element == TemperatureMeasurement {
+    
+    func maximumValue() -> Double? {
+        compactMap { $0.maximumValue }.max()
+    }
+    
+    func minimumValue() -> Double? {
+        compactMap { $0.minimumValue }.min()
     }
 }
 
@@ -28,19 +101,6 @@ private extension TemperatureValue {
     }
 }
 
-private extension TemperatureMeasurement {
-
-    init(t0: Double?, t1: Double?, secs: Int) {
-        self.sensor0 = .init(value: t0)
-        self.sensor1 = .init(value: t1)
-        self.date = Date().addingTimeInterval(TimeInterval(secs-3600))
-    }
-
-    init(t0: Double?, t1: Double?, min: Int) {
-        self.init(t0: t0, t1: t1, secs: min * 60)
-    }
-}
-
 extension TemperatureMeasurement {
 
     static let mockData: [TemperatureMeasurement] = {
@@ -106,8 +166,13 @@ extension TemperatureMeasurement {
             (15.5, 25.0),
             (15.0, 25.0),
         ]
+        
+        let seconds = Date().seconds
         return temps.enumerated().map {
-            TemperatureMeasurement(t0: $0.element.0, t1: $0.element.1, min: $0.offset)
+            TemperatureMeasurement(
+                sensor0: .init(value: $0.element.0),
+                sensor1: .init(value: $0.element.1),
+                id: seconds + $0.offset * 60)
         }
     }()
 }

TempTrack/Temperature/TemperatureSensor.swift

@@ -60,35 +60,3 @@ extension TemperatureSensor {
         self.date = Date().addingTimeInterval(-TimeInterval(secondsAgo))
     }
 }
-
-extension Date {
-    
-    var timePassedText: String {
-        let secs = Int(-timeIntervalSinceNow.rounded())
-        guard secs > 1 else {
-            return "Now"
-        }
-        guard secs >= 60 else {
-            return "\(secs) seconds ago"
-        }
-        let minutes = secs / 60
-        guard minutes > 1 else {
-            return "1 minute ago"
-        }
-        guard minutes >= 60 else {
-            return "\(minutes) minutes ago"
-        }
-        let hours = minutes / 60
-        guard hours > 1 else {
-            return "1 hour ago"
-        }
-        guard hours >= 60 else {
-            return "\(hours) hours ago"
-        }
-        let days = hours / 24
-        guard days > 1 else {
-            return "1 day ago"
-        }
-        return "\(days) days ago"
-    }
-}

TempTrack/Temperature/TemperatureValue.swift

@@ -16,6 +16,18 @@ enum TemperatureValue {
         }
     }
     
+    var byte: UInt8 {
+        switch self {
+        case .notFound:
+            return 0
+        case .invalidMeasurement:
+            return 1
+        case .value(let double):
+            let value = Int(double + 40) * 2
+            return UInt8(clamping: value)
+        }
+    }
+    
     var optionalValue: Double? {
         if case .value(let val) = self {
             return val
@@ -41,3 +53,18 @@ enum TemperatureValue {
         }
     }
 }
+
+extension TemperatureValue: Codable {
+    
+    init(from decoder: Decoder) throws {
+        let container = try decoder.singleValueContainer()
+        let byte = try container.decode(UInt8.self)
+        self.init(byte: byte)
+    }
+    
+    func encode(to encoder: Encoder) throws {
+        var container = encoder.singleValueContainer()
+        try container.encode(byte)
+    }
+    
+}

TempTrack/TemperatureStorage.swift

@@ -1,76 +0,0 @@
-import Foundation
-import Combine
-import SQLite
-
-final class TemperatureStorage: ObservableObject {
-
-    static var documentDirectory: URL {
-        try! FileManager.default.url(
-        for: .documentDirectory,
-        in: .userDomainMask,
-        appropriateFor: nil, create: true)
-    }
-
-    private let databaseUrl: URL
-
-    @Published
-    var lastMeasurements: [TemperatureMeasurement]
-
-    init(lastMeasurements: [TemperatureMeasurement] = []) {
-        self.lastMeasurements = lastMeasurements
-        self.databaseUrl = TemperatureStorage.documentDirectory.appendingPathComponent("db.sqlite3")
-    }
-
-    private let table = Table("values")
-    private let i
-
-    private func createDatabaseIfNeeded() throws {
-        let db = try Connection(databaseUrl.path)
-
-        let users = Table("users")
-        let id = Expression<Int64>("id")
-        let name = Expression<String?>("name")
-        let email = Expression<String>("email")
-
-        try db.run(users.create(ifNotExists: true) { t in
-            t.column(id, primaryKey: true)
-            t.column(name)
-            t.column(email, unique: true)
-        })
-        // CREATE TABLE "users" (
-        //     "id" INTEGER PRIMARY KEY NOT NULL,
-        //     "name" TEXT,
-        //     "email" TEXT NOT NULL UNIQUE
-        // )
-
-        let insert = users.insert(name <- "Alice", email <- "alice@mac.com")
-        let rowid = try db.run(insert)
-        // INSERT INTO "users" ("name", "email") VALUES ('Alice', 'alice@mac.com')
-
-        for user in try db.prepare(users) {
-            print("id: \(user[id]), name: \(user[name]), email: \(user[email])")
-            // id: 1, name: Optional("Alice"), email: alice@mac.com
-        }
-        // SELECT * FROM "users"
-
-        let alice = users.filter(id == rowid)
-
-        try db.run(alice.update(email <- email.replace("mac.com", with: "me.com")))
-        // UPDATE "users" SET "email" = replace("email", 'mac.com', 'me.com')
-        // WHERE ("id" = 1)
-
-        try db.run(alice.delete())
-        // DELETE FROM "users" WHERE ("id" = 1)
-
-        try db.scalar(users.count) // 0
-        // SELECT count(*) FROM "users"
-    }
-    
-}
-
-extension TemperatureStorage: TemperatureDataTransferDelegate {
-    
-    func didReceiveRecording(_ measurement: TemperatureMeasurement) {
-        //print("Temperature \(measurement.date): \(temp1), \(temp2)")
-    }
-}

TempTrack/Views/DeviceInfoView.swift

@@ -18,9 +18,6 @@ struct DeviceInfoView: View {
     @Binding
     var isPresented: Bool
     
-    @Binding
-    var updateToggle: Bool
-    
     private var runTimeString: String {
         let number = info.numberOfSecondsRunning
         guard number >= 60 else {
@@ -101,6 +98,10 @@ struct DeviceInfoView: View {
         }
     }
     
+    var updateText: String {
+        return "Updated \(info.receivedDate.timePassedText)"
+    }
+    
     var body: some View {
         VStack(alignment: .leading, spacing: 5) {
             HStack {
@@ -164,9 +165,11 @@ struct DeviceInfoView: View {
             Spacer()
             HStack {
                 Spacer()
-                Text("Updated \(info.receivedDate.timePassedText)")
+                TimelineView(.periodic(from: Date(), by: 1)) { context in
-                    .font(.footnote)
+                    Text(updateText)
-                    .textCase(.uppercase)
+                        .font(.footnote)
+                        .textCase(.uppercase)
+                }
                 Spacer()
             }
         }.padding()
@@ -175,11 +178,8 @@ struct DeviceInfoView: View {
 
 struct DeviceInfoView_Previews: PreviewProvider {
     static var previews: some View {
-        DeviceInfoView(
+        DeviceInfoView(info: .mock, isPresented: .constant(true))
-            info: .mock,
+            .previewLayout(.fixed(width: 375, height: 600))
-            isPresented: .constant(true),
-            updateToggle: .constant(true))
-        .previewLayout(.fixed(width: 375, height: 600))
     }
 }
 

TempTrack/Views/HistoryList.swift

@@ -0,0 +1,28 @@
+import SwiftUI
+
+struct HistoryList: View {
+    
+    @EnvironmentObject
+    var storage: TemperatureStorage
+    
+    var body: some View {
+        NavigationView {
+            List(storage.dailyMeasurementCounts) { day in
+                NavigationLink(destination: {
+                    TemperatureDayOverview(storage: storage, dateIndex: day.dateIndex)
+                }) {
+                    HistoryListRow(entry: day)
+                }
+            }
+            .navigationTitle("History")
+            .navigationBarTitleDisplayMode(.large)
+        }
+    }
+}
+
+struct HistoryList_Previews: PreviewProvider {
+    static var previews: some View {
+        HistoryList()
+            .environmentObject(TemperatureStorage(lastMeasurements: TemperatureMeasurement.mockData))
+    }
+}

TempTrack/Views/HistoryListRow.swift

@@ -0,0 +1,29 @@
+import SwiftUI
+import SFSafeSymbols
+
+private let df: DateFormatter = {
+    let df = DateFormatter()
+    df.dateStyle = .short
+    df.timeStyle = .none
+    return df
+}()
+
+struct HistoryListRow: View {
+    
+    let entry: MeasurementDailyCount
+    
+    var body: some View {
+        HStack {
+            Image(systemSymbol: .calendar)
+            Text(df.string(from: entry.date))
+            Spacer()
+            Text("\(entry.count)")
+        }
+    }
+}
+
+struct HistoryListRow_Previews: PreviewProvider {
+    static var previews: some View {
+        HistoryListRow(entry: .init(dateIndex: Date().dateIndex, count: 123))
+    }
+}

TempTrack/Views/TemperatureDayOverview.swift

@@ -0,0 +1,85 @@
+import SwiftUI
+import Charts
+
+struct TemperatureDayOverview: View {
+    
+    let storage: TemperatureStorage
+    
+    @State
+    var points: [TemperatureMeasurement] = []
+    
+    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()
+    }
+    
+    mutating func update() {
+        self.upperTempLimit = max(40, points.maximumValue() ?? 40)
+        self.lowerTempLimit = min(-20, points.minimumValue() ?? -20)
+        let startDay = points.first?.date.dateIndex ?? Date().dateIndex
+        self.pastDateLimit = Date(dateIndex: startDay)
+        let endDay = (points.last?.date.dateIndex ?? Date().dateIndex) + 1
+        self.futureDateLimit = Date(dateIndex: endDay)
+    }
+    
+    var upperTempLimit: Double = 40.0
+    var lowerTempLimit: Double = -20
+
+    var pastDateLimit: Date = Date().startOfDay
+    var futureDateLimit: Date = Date().startOfNextDay
+    
+    var body: some View {
+        Chart {
+            ForEach(points) { point in
+                if let s = point.sensor0.optionalValue {
+                    LineMark(
+                        x: .value("Date", point.date),
+                        y: .value("Temperature", s))
+                    .foregroundStyle(by: .value("Type", "Sensor 0"))
+                }
+                if let s = point.sensor1.optionalValue {
+                    LineMark(
+                        x: .value("Date", point.date),
+                        y: .value("Temperature", s))
+                    .foregroundStyle(by: .value("Type", "Sensor 1"))
+                }
+            }
+        }
+        .aspectRatio(2.6, contentMode: .fit)
+        //.chartXScale(domain: pastDateLimit...futureDateLimit)
+        .chartYScale(domain: lowerTempLimit...upperTempLimit)
+        .chartXAxis {
+            AxisMarks(preset: .automatic)
+            AxisMarks.init(values: AxisMarkValues.stride(by: .hour)) {
+                AxisGridLine()
+            }
+        }
+        .chartYAxis {
+            AxisMarks(position: .trailing, values: .automatic) { value in
+                AxisValueLabel(multiLabelAlignment: .trailing) {
+                    if let intValue = value.as(Int.self) {
+                        Text("\(intValue)°")
+                            .font(.system(size: 10))
+                            //.foregroundColor(.white)
+                    }
+                }
+            }
+            
+            AxisMarks.init(values: AxisMarkValues.stride(by: 5)) {
+                AxisGridLine()
+            }
+        }
+        .padding()
+    }
+}
+
+struct TemperatureDayOverview_Previews: PreviewProvider {
+    static var previews: some View {
+        TemperatureDayOverview(storage: TemperatureStorage.mock, dateIndex: Date().dateIndex)
+            .previewLayout(.fixed(width: 350, height: 150))
+            //.background(.gray)
+    }
+}

TempTrack/Views/TemperatureHistoryChart.swift

@@ -3,7 +3,8 @@ import Charts
 
 struct TemperatureHistoryChart: View {
 
-    let points: [TemperatureMeasurement]
+    @Binding
+    var points: [TemperatureMeasurement]
 
     let upperTempLimit = 40.0
     let lowerTempLimit = -20.0
@@ -16,13 +17,13 @@ struct TemperatureHistoryChart: View {
             ForEach(points) { point in
                 if let s = point.sensor0.optionalValue {
                     LineMark(
-                        x: .value("Date", point.secondsAgo),
+                        x: .value("Date", point.secondsToNow),
                         y: .value("Temperature", s))
                     .foregroundStyle(Color.red)
                 }
                 if let s = point.sensor1.optionalValue {
                     LineMark(
-                        x: .value("Date", point.secondsAgo),
+                        x: .value("Date", point.secondsToNow),
                         y: .value("Temperature", s))
                     .foregroundStyle(by: .value("Type", "Sensor 1"))
                 }
@@ -36,13 +37,12 @@ struct TemperatureHistoryChart: View {
             AxisMarks(position: .trailing, values: .automatic) { value in
                 AxisValueLabel(multiLabelAlignment: .trailing) {
                     if let intValue = value.as(Int.self) {
-                        Text("\(intValue) km")
+                        Text("\(intValue)°")
                             .font(.system(size: 10))
                             .foregroundColor(.white)
                     }
                 }
               }
-            //AxisMarks(position: .trailing, stroke: StrokeStyle(lineWidth: 0))
         }
         .padding()
     }
@@ -51,7 +51,7 @@ struct TemperatureHistoryChart: View {
 struct TemperatureHistoryChart_Previews: PreviewProvider {
     static var previews: some View {
         TemperatureHistoryChart(
-            points: TemperatureMeasurement.mockData)
+            points: .constant(TemperatureMeasurement.mockData))
         .previewLayout(.fixed(width: 350, height: 150))
         .background(.gray)
     }