implement lap edit

MultiChrono/EditLapView.swift

@@ -0,0 +1,165 @@
+//
+//  EditLapView.swift
+//  MultiChrono
+//
+//  Created by Beatrice Dellacà on 27/01/26.
+//
+
+import SwiftUI
+
+struct EditLapView: View {
+    @Environment(\.dismiss) var dismiss
+    @State var lap: Stopwatch.Lap
+    var onSave: (Stopwatch.Lap) -> Void
+    
+    var body: some View {
+        NavigationStack {
+            Form {
+                Section(header: Text("Start Time")) {
+                    PreciseTimePicker(date: $lap.startTime)
+                }
+                
+                Section(header: Text("End Time")) {
+                    PreciseTimePicker(date: $lap.endTime)
+                }
+                
+                Section(header: Text("Duration")) {
+                    HStack {
+                        Text("Duration")
+                        Spacer()
+                        Text(Stopwatch.format(interval: lap.endTime.timeIntervalSince(lap.startTime), format: AppSettings.shared.timeFormat))
+                            .foregroundStyle(.secondary)
+                    }
+                }
+            }
+            .navigationTitle("Edit Lap \(lap.number)")
+            .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .cancellationAction) {
+                    Button("Cancel") {
+                        dismiss()
+                    }
+                }
+                ToolbarItem(placement: .confirmationAction) {
+                    Button("Save") {
+                        onSave(lap)
+                        dismiss()
+                    }
+                }
+            }
+        }
+    }
+}
+
+struct PreciseTimePicker: View {
+    @Binding var date: Date
+    
+    var body: some View {
+        VStack(spacing: 12) {
+            DatePicker("Date & Time", selection: $date, displayedComponents: [.hourAndMinute, .date])
+            
+            HStack(spacing: 0) {
+                Text("Sec")
+                    .font(.caption)
+                    .frame(width: 40)
+                
+                Picker("Seconds", selection: Binding(
+                    get: { Calendar.current.component(.second, from: date) },
+                    set: { newSecond in
+                        if let newDate = Calendar.current.date(bySetting: .second, value: newSecond, of: date) {
+                            date = newDate
+                        }
+                    }
+                )) {
+                    ForEach(0..<60) {
+                        Text(String(format: "%02d", $0)).tag($0)
+                    }
+                }
+                .pickerStyle(.wheel)
+                .frame(height: 100)
+                .clipped()
+                
+                Spacer()
+                    .frame(width: 20)
+                
+                Text("ms")
+                    .font(.caption)
+                    .frame(width: 30)
+                
+                // Milliseconds - Hundreds
+                Picker("Hundreds", selection: Binding(
+                    get: { (Calendar.current.component(.nanosecond, from: date) / 1_000_000) / 100 },
+                    set: { newHundreds in
+                        let currentMillis = Calendar.current.component(.nanosecond, from: date) / 1_000_000
+                        let tensAndUnits = currentMillis % 100
+                        let totalMillis = (newHundreds * 100) + tensAndUnits
+                        if let newDate = Calendar.current.date(bySetting: .nanosecond, value: totalMillis * 1_000_000, of: date) {
+                            date = newDate
+                        }
+                    }
+                )) {
+                    ForEach(0..<10) {
+                        Text("\($0)").tag($0)
+                    }
+                }
+                .pickerStyle(.wheel)
+                .frame(width: 40, height: 100)
+                .clipped()
+                
+                // Milliseconds - Tens
+                Picker("Tens", selection: Binding(
+                    get: { ((Calendar.current.component(.nanosecond, from: date) / 1_000_000) % 100) / 10 },
+                    set: { newTens in
+                        let currentMillis = Calendar.current.component(.nanosecond, from: date) / 1_000_000
+                        let hundreds = currentMillis / 100
+                        let units = currentMillis % 10
+                        let totalMillis = (hundreds * 100) + (newTens * 10) + units
+                        if let newDate = Calendar.current.date(bySetting: .nanosecond, value: totalMillis * 1_000_000, of: date) {
+                            date = newDate
+                        }
+                    }
+                )) {
+                    ForEach(0..<10) {
+                        Text("\($0)").tag($0)
+                    }
+                }
+                .pickerStyle(.wheel)
+                .frame(width: 40, height: 100)
+                .clipped()
+                
+                // Milliseconds - Units
+                Picker("Units", selection: Binding(
+                    get: { (Calendar.current.component(.nanosecond, from: date) / 1_000_000) % 10 },
+                    set: { newUnits in
+                        let currentMillis = Calendar.current.component(.nanosecond, from: date) / 1_000_000
+                        let hundredsAndTens = (currentMillis / 10) * 10
+                        let totalMillis = hundredsAndTens + newUnits
+                        if let newDate = Calendar.current.date(bySetting: .nanosecond, value: totalMillis * 1_000_000, of: date) {
+                            date = newDate
+                        }
+                    }
+                )) {
+                    ForEach(0..<10) {
+                        Text("\($0)").tag($0)
+                    }
+                }
+                .pickerStyle(.wheel)
+                .frame(width: 40, height: 100)
+                .clipped()
+            }
+        }
+    }
+}
+
+#Preview {
+    EditLapView(
+        lap: Stopwatch.Lap(
+            id: UUID(),
+            number: 1,
+            startTime: Date(),
+            endTime: Date().addingTimeInterval(65),
+            duration: 65
+        ),
+        onSave: { _ in }
+    )
+}

MultiChrono/Stopwatch.swift

@@ -12,9 +12,9 @@ class Stopwatch: ObservableObject, Identifiable, Codable {
     struct Lap: Identifiable, Codable {
         let id: UUID
         let number: Int
-        let startTime: Date
+        var startTime: Date
-        let endTime: Date
+        var endTime: Date
-        let duration: TimeInterval
+        var duration: TimeInterval
     }
 
     let id: UUID
@@ -188,4 +188,34 @@ class Stopwatch: ObservableObject, Identifiable, Codable {
     var currentRunStartTime: Date? {
         return startTime
     }
+    
+    func update(lap: Lap) {
+        guard let index = laps.firstIndex(where: { $0.id == lap.id }) else { return }
+        
+        var updatedLap = lap
+        // Recalculate duration in case start/end times were changed
+        updatedLap.duration = updatedLap.endTime.timeIntervalSince(updatedLap.startTime)
+        
+        laps[index] = updatedLap
+        
+        // Recalculate accumulatedTime from all laps
+        // Note: This assumes accumulatedTime is strictly the sum of all closed laps.
+        // If the stopwatch is running, the current "open" lap is not in `laps` yet (it's implicit).
+        // However, `accumulatedTime` tracks the time *before* the current run started.
+        // If we edited a *past* lap, we should update accumulatedTime to be the sum of all past laps.
+        
+        // Let's assume laps are only recorded when paused or when split.
+        // If we claim `accumulatedTime` is the sum of all stored laps:
+        let totalLapDuration = laps.reduce(0) { $0 + $1.duration }
+        accumulatedTime = totalLapDuration
+        
+        if isRunning {
+            // function tick() will update elapsedTime naturally, but to be immediate:
+            if let start = startTime {
+                elapsedTime = accumulatedTime + Date().timeIntervalSince(start)
+            }
+        } else {
+            elapsedTime = accumulatedTime
+        }
+    }
 }

MultiChrono/StopwatchDetailView.swift

@@ -17,6 +17,7 @@ struct StopwatchDetailView: View {
     @State private var draftName: String
     @State private var isShowingResetAlert = false
     @State private var isShowingDeleteAlert = false
+    @State private var editingLap: Stopwatch.Lap?
     
     private let dateFormatter: DateFormatter = {
         let formatter = DateFormatter()
@@ -78,6 +79,9 @@ struct StopwatchDetailView: View {
                     } else {
                         List {
                             ForEach(stopwatch.laps) { lap in
+                                Button {
+                                    editingLap = lap
+                                } label: {
                                     VStack(alignment: .leading, spacing: 4) {
                                         HStack {
                                             Text("Lap \(lap.number)")
@@ -100,6 +104,8 @@ struct StopwatchDetailView: View {
                                     }
                                     .padding(.vertical, 2)
                                 }
+                                .buttonStyle(.plain)
+                            }
                         }
                     }
                 }
@@ -108,26 +114,21 @@ struct StopwatchDetailView: View {
                     Button(role: .destructive) {
                         isShowingResetAlert = true
                     } label: {
-                        HStack {
-                            Spacer()
                         Text("Reset Stopwatch")
-                            Spacer()
-                        }
                     }
+                    .frame(maxWidth: .infinity, alignment: .center)
                 }
                 
                 Section {
                         Button(role: .destructive) {
                             isShowingDeleteAlert = true
                         } label: {
-                        HStack {
-                            Spacer()
                             Text("Delete Stopwatch")
-                            Spacer()
+                        }
-                        }
+                        .frame(maxWidth: .infinity, alignment: .center)
-                    }
                     }
                 }
+                
             .navigationTitle("Edit Stopwatch")
             .navigationBarTitleDisplayMode(.inline)
             .alert("Are you sure you want to reset the Stopwatch \(stopwatch.name)?", isPresented: $isShowingResetAlert) {
@@ -155,6 +156,11 @@ struct StopwatchDetailView: View {
                     .disabled(draftName.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty)
                 }
             }
+            .sheet(item: $editingLap) { lap in
+                EditLapView(lap: lap) { updatedLap in
+                    stopwatch.update(lap: updatedLap)
+                }
+            }
         }
     }
 }