Add CSV export for days

TempTrack.xcodeproj/project.pbxproj

@@ -49,6 +49,8 @@
 		E2E69B682A529FA800C6035E /* TransferHandler.swift in Sources */ = {isa = PBXBuildFile; fileRef = E2E69B672A529FA800C6035E /* TransferHandler.swift */; };
 		E2FD1D6B2D4CE64300B48627 /* ZIPFoundation in Frameworks */ = {isa = PBXBuildFile; productRef = E2FD1D6A2D4CE64300B48627 /* ZIPFoundation */; };
 		E2FD1D6F2D4CE83700B48627 /* ExportSheet.swift in Sources */ = {isa = PBXBuildFile; fileRef = E2FD1D6E2D4CE83700B48627 /* ExportSheet.swift */; };
+		E2FD1D712D4CF5EB00B48627 /* CsvConverter.swift in Sources */ = {isa = PBXBuildFile; fileRef = E2FD1D702D4CF5E700B48627 /* CsvConverter.swift */; };
+		E2FD1D732D4CF82100B48627 /* ShareCsvSheet.swift in Sources */ = {isa = PBXBuildFile; fileRef = E2FD1D722D4CF81900B48627 /* ShareCsvSheet.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXFileReference section */
@@ -93,6 +95,8 @@
 		E2E69B652A4DA48B00C6035E /* BluetoothDevice.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = BluetoothDevice.swift; sourceTree = "<group>"; };
 		E2E69B672A529FA800C6035E /* TransferHandler.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = TransferHandler.swift; sourceTree = "<group>"; };
 		E2FD1D6E2D4CE83700B48627 /* ExportSheet.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ExportSheet.swift; sourceTree = "<group>"; };
+		E2FD1D702D4CF5E700B48627 /* CsvConverter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = CsvConverter.swift; sourceTree = "<group>"; };
+		E2FD1D722D4CF81900B48627 /* ShareCsvSheet.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ShareCsvSheet.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -112,6 +116,7 @@
 		88404DD92A2F4DB100D30244 /* Storage */ = {
 			isa = PBXGroup;
 			children = (
+				E2FD1D702D4CF5E700B48627 /* CsvConverter.swift */,
 				88404DDA2A2F4DCA00D30244 /* MeasurementDailyCount.swift */,
 				88CDE0672A2698B400114294 /* PersistentStorage.swift */,
 				E2A553F82A399F58005204C3 /* Log.swift */,
@@ -196,6 +201,7 @@
 				E2A554042A4ADA93005204C3 /* TransferView.swift */,
 				E2E69B5F2A4CD48F00C6035E /* IconAndTextView.swift */,
 				E2FD1D6E2D4CE83700B48627 /* ExportSheet.swift */,
+				E2FD1D722D4CF81900B48627 /* ShareCsvSheet.swift */,
 			);
 			path = Views;
 			sourceTree = "<group>";
@@ -312,6 +318,7 @@
 				E2A554142A4C9C96005204C3 /* DeviceDataRequest.swift in Sources */,
 				88CDE0512A2508E900114294 /* ContentView.swift in Sources */,
 				88CDE0702A28AEA300114294 /* TemperatureMeasurement.swift in Sources */,
+				E2FD1D732D4CF82100B48627 /* ShareCsvSheet.swift in Sources */,
 				E2A554162A4C9D2E005204C3 /* DeviceDataResetRequest.swift in Sources */,
 				88404DE12A31CA6B00D30244 /* BluetoothResponseType.swift in Sources */,
 				88404DDF2A2F68E100D30244 /* TemperatureDayOverview.swift in Sources */,
@@ -337,6 +344,7 @@
 				88404DD22A2F0D8F00D30244 /* Double+Extensions.swift in Sources */,
 				E2A554102A4C9C68005204C3 /* DeviceRequest.swift in Sources */,
 				E253A9222A2B39B700EC6B28 /* Color+Extensions.swift in Sources */,
+				E2FD1D712D4CF5EB00B48627 /* CsvConverter.swift in Sources */,
 				E2E69B682A529FA800C6035E /* TransferHandler.swift in Sources */,
 				88404DEB2A37BE3000D30244 /* DeviceWakeCause.swift in Sources */,
 				88CDE06D2A28A92000114294 /* DeviceInfo.swift in Sources */,

TempTrack/Storage/CsvConverter.swift

@@ -0,0 +1,40 @@
+import Foundation
+
+struct CsvConverter {
+
+    private let dateFormatter: DateFormatter
+
+    init() {
+        dateFormatter = .init()
+        dateFormatter.dateStyle = .short
+        dateFormatter.timeStyle = .medium
+    }
+
+    private var header: String {
+        "Index;Date;Sensor 0;Sensor 1\n"
+    }
+
+    func convert(measurements: [TemperatureMeasurement]) -> String {
+        header + measurements.enumerated().map { (index, measurement) -> String in
+            let parts: [String] = [
+                "\(index)",
+                dateFormatter.string(from: measurement.date),
+                convert(measurement.sensor0),
+                convert(measurement.sensor1)
+            ]
+
+            return parts.joined(separator: ";")
+        }.joined(separator: "\n")
+    }
+
+    private func convert(_ value: TemperatureValue) -> String {
+        switch value {
+        case .notFound:
+            return ""
+        case .invalidMeasurement:
+            return "?"
+        case .value(let value):
+            return String(format:"%.1f", value)
+        }
+    }
+}

TempTrack/Views/DayView.swift

@@ -1,4 +1,5 @@
 import SwiftUI
+import SFSafeSymbols
 
 private let df: DateFormatter = {
     let df = DateFormatter()
@@ -21,20 +22,46 @@ struct DayView: View {
     @EnvironmentObject
     var storage: PersistentStorage
 
+    @State
+    private var showShareSheet = false
+
+    private let title: String
+
+    init(dateIndex: Int) {
+        self.dateIndex = dateIndex
+        self.title = Date(dateIndex: dateIndex)
+            .formatted(date: .abbreviated, time: .omitted)
+    }
+
     var entries: [TemperatureMeasurement] {
         storage.loadMeasurements(for: dateIndex)
     }
 
     var body: some View {
+        VStack {
             TemperatureDayOverview(points: entries)
             List(entries) { entry in
                 HStack {
-                Text(df.string(from: entry.date))
+                    Text(entry.date.formatted(date: .omitted, time: .standard))
                     Spacer()
                     Text(entry.displayText)
                 }
             }
         }
+        .navigationTitle(title)
+        .navigationBarTitleDisplayMode(.large)
+        .toolbar {
+            ToolbarItem {
+                Button(action: { showShareSheet = true }) {
+                    Label("Export", systemSymbol: .arrowUpDoc)
+                }
+            }
+        }
+        .sheet(isPresented: $showShareSheet) {
+            ShareCsvSheet(isPresented: $showShareSheet,
+                          measurements: entries)
+        }
+    }
 }
 
 struct DayView_Previews: PreviewProvider {

TempTrack/Views/ExportSheet.swift

@@ -39,6 +39,7 @@ struct ExportSheet: View {
                 Button("Delete archive", action: deleteArchive)
                     .padding()
             }
+            Button("Dismiss", action: { isPresented = false })
         }
         .padding()
     }

TempTrack/Views/ShareCsvSheet.swift

@@ -0,0 +1,91 @@
+import SwiftUI
+
+struct ShareCsvSheet: View {
+
+    @Binding var isPresented: Bool
+
+    @State
+    private var isCreatingFile = false
+
+    @State var url: URL?
+
+    @State var error: String?
+
+    @EnvironmentObject
+    private var storage: PersistentStorage
+
+    let measurements: [TemperatureMeasurement]
+
+    var body: some View {
+        VStack {
+            Text("Export")
+                .font(.title)
+            Text("Create a CSV file of all measurements for the day")
+            if isCreatingFile {
+                ProgressView()
+                Text("Creating file...")
+            }
+            if let error {
+                Text(error)
+                    .foregroundStyle(.red)
+            }
+            Spacer()
+            Button("Create file", action: createFile)
+                .disabled(isCreatingFile)
+                .padding()
+            if let url {
+                ShareLink(item: url) {
+                    Label("Share file", systemImage: "square.and.arrow.up")
+                }
+                .padding()
+                Button("Delete file", action: deleteFile)
+                    .padding()
+            }
+            Button("Dismiss", action: { isPresented = false })
+        }
+        .padding()
+    }
+
+    private func createFile() {
+        guard !isCreatingFile else {
+            return
+        }
+        isCreatingFile = true
+        DispatchQueue.main.async {
+            do {
+                let url = FileManager.default.temporaryDirectory.appendingPathComponent("export.csv")
+                let converter = CsvConverter()
+                let content = converter.convert(measurements: measurements)
+                try content.write(to: url, atomically: true, encoding: .utf8)
+                DispatchQueue.main.async {
+                    self.url = url
+                    self.error = nil
+                    self.isCreatingFile = false
+                }
+            } catch {
+                DispatchQueue.main.async {
+                    self.error = "Failed to save file: \(error.localizedDescription)"
+                    self.isCreatingFile = false
+                }
+            }
+        }
+    }
+
+    private func deleteFile() {
+        guard let url else {
+            return
+        }
+        do {
+            try FileManager.default.removeItem(at: url)
+            self.error = nil
+            self.url = nil
+        } catch {
+            self.error = "Failed to delete archive: \(error.localizedDescription)"
+        }
+    }
+}
+
+#Preview {
+    ShareCsvSheet(isPresented: .constant(true),
+                  measurements: [])
+}