added working notifications to the app for recipe steps

lib/entities/PizzaEvent.dart

@@ -1,6 +1,10 @@
 
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
 import 'package:hive/hive.dart';
 import 'package:pizzaplanner/entities/PizzaRecipe/PizzaRecipe.dart';
+import 'package:pizzaplanner/main.dart';
+
+import 'package:timezone/timezone.dart' as tz;
 
 part 'PizzaEvent.g.dart';
 
@@ -28,4 +32,35 @@ class PizzaEvent extends HiveObject{
     this.doughBallSize,
     this.dateTime
   );
+
+  Future<void> createPizzaEventNotifications() async {
+    const androidPlatformChannelSpecifics = AndroidNotificationDetails(
+        "PizzaEventChannel", "PizzaEventChannel", "PizzaPlanner notification channel",
+        importance: Importance.max,
+        priority: Priority.high,
+        ticker: "ticker"
+    );
+
+    const platformChannelSpecific = NotificationDetails(android: androidPlatformChannelSpecifics);
+
+    var stepTime = tz.TZDateTime.from(dateTime, tz.local);
+    var durationToFirstStep = Duration(seconds: this.recipe.recipeSteps
+        .map((recipeStep) => recipeStep.getCurrentWaitInSeconds())
+        .fold(0, (a, b) => a+b));
+    stepTime = stepTime.subtract(durationToFirstStep);
+
+    for (var recipeStep in this.recipe.recipeSteps) {
+      await flutterLocalNotificationsPlugin.zonedSchedule(
+          "${name}_${recipeStep.name}_${dateTime.millisecondsSinceEpoch}".hashCode,
+          recipeStep.name,
+          null,
+          stepTime,
+          platformChannelSpecific,
+          androidAllowWhileIdle: true,
+          uiLocalNotificationDateInterpretation:
+          UILocalNotificationDateInterpretation.absoluteTime
+      );
+      stepTime = stepTime.add(Duration(seconds: recipeStep.getCurrentWaitInSeconds()));
+    }
+  }
 }

lib/main.dart

@@ -1,5 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:flutter_native_timezone/flutter_native_timezone.dart';
 import 'package:pizzaplanner/entities/PizzaEvent.dart';
 import 'package:pizzaplanner/entities/PizzaRecipe/Ingredient.dart';
 import 'package:pizzaplanner/entities/PizzaRecipe/PizzaRecipe.dart';
@@ -14,6 +15,9 @@ import 'package:hive/hive.dart';
 import 'package:hive_flutter/hive_flutter.dart';
 import 'package:pizzaplanner/util.dart';
 
+import 'package:timezone/data/latest.dart' as tz;
+import 'package:timezone/timezone.dart' as tz;
+
 final flutterLocalNotificationsPlugin = FlutterLocalNotificationsPlugin();
 
 void main() async {
@@ -46,6 +50,11 @@ void main() async {
   await flutterLocalNotificationsPlugin.initialize(initializationSettings,
       onSelectNotification: selectNotification);
 
+  // init timezones properly
+  tz.initializeTimeZones();
+  final String? timeZoneName = await FlutterNativeTimezone.getLocalTimezone();
+  tz.setLocalLocation(tz.getLocation(timeZoneName!));
+
   runApp(PizzaPlanner());
 
   //await Hive.close();

lib/pages/AddPizzaEventPage.dart

@@ -1,6 +1,7 @@
 import 'package:flutter/cupertino.dart';
 import 'package:flutter/material.dart';
 import 'package:flutter_datetime_picker/flutter_datetime_picker.dart';
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
 import 'package:fluttericon/font_awesome5_icons.dart';
 
 import 'package:pizzaplanner/entities/PizzaEvent.dart';
@@ -66,6 +67,7 @@ class AddPizzaEventPageState extends State<AddPizzaEventPage> {
                                   Icon(FontAwesome5.hashtag),
                                   Expanded(
                                       child: Slider(
+
                                         value: pizzaCount.toDouble(),
                                         min: 1,
                                         max: 20,
@@ -164,16 +166,19 @@ class AddPizzaEventPageState extends State<AddPizzaEventPage> {
                               if (eventTime == null){
                                 return;
                               }
-                              var pizzaEventsBox = await Hive.box<PizzaEvent>("PizzaEvents");
+
-                              pizzaEventsBox.add(
+                              var pizzaEventsBox = Hive.box<PizzaEvent>("PizzaEvents");
-                                  PizzaEvent(
+                              PizzaEvent pizzaEvent = PizzaEvent(
-                                      this.name,
+                                  this.name,
-                                      this.widget.pizzaRecipe,
+                                  this.widget.pizzaRecipe,
-                                      this.pizzaCount,
+                                  this.pizzaCount,
-                                      this.doughBallSize,
+                                  this.doughBallSize,
-                                      eventTime
+                                  eventTime
-                                  )
                               );
+                              await pizzaEventsBox.add(pizzaEvent);
+
+                              pizzaEvent.createPizzaEventNotifications();
+
                               Navigator.pop(context);
                               Navigator.pop(context); // two times because of the pick recipe page
                             },

pubspec.yaml

@@ -38,6 +38,8 @@ dependencies:
   hive: ^2.0.4
   hive_flutter: ^1.1.0
 
+  timezone: ^0.7.0
+  flutter_native_timezone: ^2.0.0
   flutter_local_notifications: ^8.0.0
 
 dev_dependencies: