added workout widget and workout provider to handle different workout phases and durations

lib/pages/interval_page.dart

@@ -3,8 +3,10 @@ import 'package:audioplayers/audioplayers.dart';
 import 'package:flutter/material.dart';
 import 'package:provider/provider.dart';
 import 'package:smoke_cess_app/providers/timer_provider.dart';
+import 'package:smoke_cess_app/providers/workout_provider.dart';
 import 'package:smoke_cess_app/widgets/popup_for_start_and_stop.dart';
 import 'package:smoke_cess_app/widgets/timer_widget.dart';
+import 'package:smoke_cess_app/widgets/workout_timer_widget.dart';
 
 import '../providers/input_provider.dart';
 
@@ -168,7 +170,14 @@ class _IntervalTimerPageState extends State<IntervalTimerPage> {
 
   @override
   Widget build(BuildContext context) {
-    return ChangeNotifierProvider(
+    return MultiProvider(
+      providers: [
+        ChangeNotifierProvider(create: (context) => TimerProvider()),
+        ChangeNotifierProvider(create: (context) => WorkoutProvider())
+      ],
+      child: WorkoutTimerWidget(),
+    );
+    ChangeNotifierProvider(
         create: (context) => TimerProvider(),
         child: TimerWidget(
           duration: Duration(seconds: 5),

lib/pages/main_page.dart

@@ -15,7 +15,7 @@ class MyHomePage extends StatefulWidget {
 }
 
 class MyHomePageState extends State<MyHomePage> {
-  int _selectedIndex = 4;
+  int _selectedIndex = 2;
   int? _gruppe;
 
   final List<String> _titles = [

lib/providers/timer_provider.dart

@@ -9,9 +9,9 @@ class TimerProvider extends ChangeNotifier {
 
   void startTimer(Duration duration) {
     started = true;
-    print('starting timer');
     _timer = Timer.periodic(const Duration(seconds: 1), ((timer) {
       if (timer.tick >= duration.inSeconds) {
+        print(elapsedSeconds);
         timer.cancel();
         started = false;
       }

lib/providers/workout_provider.dart

@@ -0,0 +1,33 @@
+import 'package:flutter/material.dart';
+
+class WorkoutProvider extends ChangeNotifier {
+  final List<String> _workoutPhases = [
+    'Warm-Up',
+    'High Intensity',
+    'Low Intensity',
+    'High Intensity',
+    'Low Intensity',
+    'High Intensity',
+    'Low Intensity',
+    'High Intensity',
+    'Cool-down'
+  ];
+  final Map<String, Duration> _phasesDuration = {
+    'Warm-Up': const Duration(seconds: 5),
+    'High Intensity': const Duration(seconds: 4),
+    'Low Intensity': const Duration(seconds: 3),
+    'Cool-down': const Duration(seconds: 5)
+  };
+  int _workoutPhaseIndex = 0;
+
+  String get currentPhase => _workoutPhases[_workoutPhaseIndex];
+  Duration get currentPhaseDuration =>
+      _phasesDuration[currentPhase] ?? const Duration(seconds: 0);
+
+  void nextPhase() {
+    _workoutPhaseIndex < _workoutPhases.length
+        ? _workoutPhaseIndex += 1
+        : _workoutPhaseIndex = 0;
+    //notifyListeners();
+  }
+}

lib/widgets/workout_timer_widget.dart

@@ -0,0 +1,31 @@
+import 'package:flutter/material.dart';
+import 'package:provider/provider.dart';
+import 'package:smoke_cess_app/providers/workout_provider.dart';
+import 'package:smoke_cess_app/widgets/timer_widget.dart';
+
+import '../providers/timer_provider.dart';
+
+class WorkoutTimerWidget extends StatelessWidget {
+  const WorkoutTimerWidget({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    TimerProvider timerProvider = context.watch<TimerProvider>();
+    WorkoutProvider workoutProvider = context.watch<WorkoutProvider>();
+
+    if (timerProvider.elapsedSeconds ==
+        workoutProvider.currentPhaseDuration.inSeconds) {
+      print('Timer abgelaufen');
+      workoutProvider.nextPhase();
+      timerProvider.startTimer(workoutProvider.currentPhaseDuration);
+    }
+
+    return Column(
+      mainAxisAlignment: MainAxisAlignment.center,
+      children: [
+        Text(workoutProvider.currentPhase),
+        TimerWidget(duration: workoutProvider.currentPhaseDuration)
+      ],
+    );
+  }
+}