If there is a rest time, show a countdown timer in the gym mode

lib/widgets/routines/day.dart

@@ -145,6 +145,7 @@ class DayHeader extends StatelessWidget {
         style: Theme.of(context).textTheme.headlineSmall,
         overflow: TextOverflow.ellipsis,
       ),
+      subtitle: Text(_dayData.day!.description),
       leading: _viewMode ? null : const Icon(Icons.play_arrow),
       trailing: _dayData.date.isSameDayAs(DateTime.now()) ? const Icon(Icons.today) : null,
       minLeadingWidth: 8,

lib/widgets/routines/gym_mode.dart

@@ -167,7 +167,19 @@ class _GymModeState extends ConsumerState<GymMode> {
           state.exercisePages,
           widget._iteration,
         ));
-        out.add(TimerWidget(_controller, ratioCompleted, state.exercisePages));
+
+        // If there is a rest time, add a countdown timer
+        if (config.restTime != null) {
+          out.add(TimerCountdownWidget(
+            _controller,
+            config.restTime!.toInt(),
+            ratioCompleted,
+            state.exercisePages,
+          ));
+        } else {
+          out.add(TimerWidget(_controller, ratioCompleted, state.exercisePages));
+        }
+
         firstPage = false;
       }
     }
@@ -1026,22 +1038,16 @@ class _TimerWidgetState extends State<TimerWidget> {
   DateTime today = DateTime(2000, 1, 1, 0, 0, 0);
 
   void startTimer() {
-    setState(() {
-      _seconds = 0;
-    });
+    setState(() => _seconds = 0);
 
     _timer?.cancel();
 
     const oneSecond = Duration(seconds: 1);
     _timer = Timer.periodic(oneSecond, (Timer timer) {
       if (_seconds == _maxSeconds) {
-        setState(() {
-          timer.cancel();
-        });
+        setState(() => timer.cancel());
       } else {
-        setState(() {
-          _seconds++;
-        });
+        setState(() => _seconds++);
       }
     });
   }
@@ -1081,6 +1087,79 @@ class _TimerWidgetState extends State<TimerWidget> {
   }
 }
 
+class TimerCountdownWidget extends StatefulWidget {
+  final PageController _controller;
+  final double _ratioCompleted;
+  final int _seconds;
+  final Map<Exercise, int> _exercisePages;
+
+  const TimerCountdownWidget(
+    this._controller,
+    this._seconds,
+    this._ratioCompleted,
+    this._exercisePages,
+  );
+
+  @override
+  _TimerCountdownWidgetState createState() => _TimerCountdownWidgetState();
+}
+
+class _TimerCountdownWidgetState extends State<TimerCountdownWidget> {
+  // See https://stackoverflow.com/questions/54610121/flutter-countdown-timer
+
+  Timer? _timer;
+  late int _seconds;
+  DateTime today = DateTime(2000, 1, 1, 0, 0, 0);
+
+  void startTimer() {
+    _timer?.cancel();
+
+    const oneSecond = Duration(seconds: 1);
+    _timer = Timer.periodic(oneSecond, (Timer timer) {
+      if (_seconds == 0) {
+        setState(() => timer.cancel());
+      } else {
+        setState(() => _seconds--);
+      }
+    });
+  }
+
+  @override
+  void dispose() {
+    _timer?.cancel();
+    super.dispose();
+  }
+
+  @override
+  void initState() {
+    super.initState();
+    _seconds = widget._seconds;
+    startTimer();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Column(
+      children: [
+        NavigationHeader(
+          AppLocalizations.of(context).pause,
+          widget._controller,
+          exercisePages: widget._exercisePages,
+        ),
+        Expanded(
+          child: Center(
+            child: Text(
+              DateFormat('m:ss').format(today.add(Duration(seconds: _seconds))),
+              style: Theme.of(context).textTheme.displayLarge!.copyWith(color: wgerPrimaryColor),
+            ),
+          ),
+        ),
+        NavigationFooter(widget._controller, widget._ratioCompleted),
+      ],
+    );
+  }
+}
+
 class NavigationFooter extends StatelessWidget {
   final PageController _controller;
   final double _ratioCompleted;

test/workout/gym_mode_screen_test.dart

@@ -148,7 +148,7 @@ void main() {
     // Bench press - pause
     //
     expect(find.text('Pause'), findsOneWidget);
-    expect(find.byType(TimerWidget), findsOneWidget);
+    expect(find.byType(TimerCountdownWidget), findsOneWidget);
     expect(find.byIcon(Icons.close), findsOneWidget);
     expect(find.byIcon(Icons.toc), findsOneWidget);
     expect(find.byIcon(Icons.chevron_left), findsOneWidget);
@@ -169,7 +169,7 @@ void main() {
     // Pause
     //
     expect(find.text('Pause'), findsOneWidget);
-    expect(find.byType(TimerWidget), findsOneWidget);
+    expect(find.byType(TimerCountdownWidget), findsOneWidget);
     expect(find.byIcon(Icons.chevron_left), findsOneWidget);
     expect(find.byIcon(Icons.close), findsOneWidget);
     expect(find.byIcon(Icons.chevron_right), findsOneWidget);
@@ -189,7 +189,7 @@ void main() {
     // Pause
     //
     expect(find.text('Pause'), findsOneWidget);
-    expect(find.byType(TimerWidget), findsOneWidget);
+    expect(find.byType(TimerCountdownWidget), findsOneWidget);
     await tester.tap(find.byIcon(Icons.chevron_right));
     await tester.pumpAndSettle();
 

test/workout/routine_screen_test.dart

@@ -65,9 +65,7 @@ void main() {
           ),
           child: const SizedBox(),
         ),
-        routes: {
-          RoutineScreen.routeName: (ctx) => const RoutineScreen(),
-        },
+        routes: {RoutineScreen.routeName: (ctx) => const RoutineScreen()},
       ),
     );
   }
@@ -83,6 +81,7 @@ void main() {
     expect(find.text('3 day workout'), findsOneWidget);
 
     expect(find.text('first day'), findsOneWidget);
+    debugDumpApp();
     expect(find.text('chest, shoulders'), findsOneWidget);
 
     expect(find.text('second day'), findsOneWidget);

test/workout/slot_entry_form_test.dart

@@ -56,7 +56,7 @@ void main() {
         localizationsDelegates: AppLocalizations.localizationsDelegates,
         supportedLocales: AppLocalizations.supportedLocales,
         navigatorKey: key,
-        home: Scaffold(body: SlotEntryForm(slotEntry, simpleMode: simpleMode)),
+        home: Scaffold(body: SlotEntryForm(slotEntry, 1, simpleMode: simpleMode)),
       ),
     );
   }
@@ -89,7 +89,7 @@ void main() {
     await tester.tap(find.byKey(const Key(SUBMIT_BUTTON_KEY_NAME)));
     await tester.pumpAndSettle();
 
-    verify(mockRoutinesProvider.editSlotEntry(any)).called(1);
+    verify(mockRoutinesProvider.editSlotEntry(any, any)).called(1);
     verify(mockRoutinesProvider.handleConfig(any, any, any)).called(8);
   });
 }

test_data/routines.dart

@@ -296,7 +296,7 @@ Routine getTestRoutine({List<Exercise>? exercises}) {
               repetitionsUnit: testRepetitionUnit1,
               weight: 10,
               weightUnit: testWeightUnit1,
-              restTime: 60,
+              restTime: null,
               rir: '',
               rpe: '',
               textRepr: '12x10kg',
@@ -310,7 +310,7 @@ Routine getTestRoutine({List<Exercise>? exercises}) {
               repetitionsUnit: testRepetitionUnit1,
               weight: 10,
               weightUnit: testWeightUnit1,
-              restTime: 60,
+              restTime: null,
               rir: '',
               rpe: '',
               textRepr: '12x10kg',
@@ -324,7 +324,7 @@ Routine getTestRoutine({List<Exercise>? exercises}) {
               repetitionsUnit: testRepetitionUnit1,
               weight: 10,
               weightUnit: testWeightUnit1,
-              restTime: 60,
+              restTime: null,
               rir: '',
               rpe: '',
               textRepr: '12x10kg',