diff --git a/lib/main.dart b/lib/main.dart
index bf9da73..2fe1f09 100644
--- a/lib/main.dart
+++ b/lib/main.dart
@@ -1,7 +1,7 @@
 import 'package:flutter/material.dart';
 import 'package:smoke_cess_app/pages/main_page.dart';
-import 'package:smoke_cess_app/service/database_service.dart';
-import 'package:smoke_cess_app/service/notification_service.dart';
+import 'package:smoke_cess_app/services/database_service.dart';
+import 'package:smoke_cess_app/services/notification_service.dart';
 import 'package:timezone/data/latest.dart' as tz;
 
 void main() {
diff --git a/lib/models/settings.dart b/lib/models/settings.dart
index 6691e91..0e7cf30 100644
--- a/lib/models/settings.dart
+++ b/lib/models/settings.dart
@@ -1,4 +1,4 @@
-import 'package:smoke_cess_app/service/json_service.dart';
+import 'package:smoke_cess_app/services/json_service.dart';
 
 class Settings {
   final int group;
diff --git a/lib/pages/main_page.dart b/lib/pages/main_page.dart
index ca3c95d..2af4f13 100644
--- a/lib/pages/main_page.dart
+++ b/lib/pages/main_page.dart
@@ -4,7 +4,7 @@ import 'package:smoke_cess_app/pages/relapse_page.dart';
 import 'package:smoke_cess_app/pages/scanner_page.dart';
 import 'package:smoke_cess_app/pages/sleep_page.dart';
 import 'package:smoke_cess_app/pages/interval_page.dart';
-import 'package:smoke_cess_app/service/settings_service.dart';
+import 'package:smoke_cess_app/services/settings_service.dart';
 import 'package:smoke_cess_app/widgets/missing_config_popup.dart';
 
 class MyHomePage extends StatefulWidget {
diff --git a/lib/pages/scanner_page.dart b/lib/pages/scanner_page.dart
index c382990..7bded71 100644
--- a/lib/pages/scanner_page.dart
+++ b/lib/pages/scanner_page.dart
@@ -2,10 +2,10 @@ import 'package:flutter/material.dart';
 import 'package:mobile_scanner/mobile_scanner.dart';
 import 'package:smoke_cess_app/models/mood.dart';
 import 'package:smoke_cess_app/models/settings.dart';
-import 'package:smoke_cess_app/service/database_service.dart';
-import 'package:smoke_cess_app/service/json_service.dart';
-import 'package:smoke_cess_app/service/settings_service.dart';
-import 'package:smoke_cess_app/service/notification_service.dart';
+import 'package:smoke_cess_app/services/database_service.dart';
+import 'package:smoke_cess_app/services/json_service.dart';
+import 'package:smoke_cess_app/services/settings_service.dart';
+import 'package:smoke_cess_app/services/notification_service.dart';
 
 import '../models/sleep.dart';
 import '../widgets/missing_config_popup.dart';
diff --git a/lib/services/database_service.dart b/lib/services/database_service.dart
new file mode 100644
index 0000000..26973f4
--- /dev/null
+++ b/lib/services/database_service.dart
@@ -0,0 +1,108 @@
+import 'dart:async';
+
+import 'package:path/path.dart';
+import 'package:smoke_cess_app/models/mood.dart';
+import 'package:sqflite/sqflite.dart';
+// ignore: depend_on_referenced_packages
+import 'package:path_provider/path_provider.dart';
+import 'dart:io';
+
+import '../models/sleep.dart';
+
+class DatabaseService {
+  DatabaseService._privateConstructor();
+  static final DatabaseService instance = DatabaseService._privateConstructor();
+
+  static Database? _database;
+  Future<Database> get database async => _database ??= await _initDatabase();
+
+  Future<Database> _initDatabase() async {
+    Directory documentsDirectory = await getApplicationDocumentsDirectory();
+    String path = join(documentsDirectory.path, 'database.db');
+    return await openDatabase(path,
+        version: 1, onCreate: _onCreate, onOpen: _createTablesIfNotExists);
+  }
+
+  Future _onCreate(Database db, int version) async {
+    await _createTablesIfNotExists(db);
+  }
+
+  Future _createTablesIfNotExists(Database db) async {
+    await db.execute(_createMoodTable);
+    await db.execute(_createSleepTable);
+    await db.execute(_createRelapseTable);
+    await db.execute(_createWorkoutTable);
+  }
+
+  //TODO use generic function?
+  Future<List<Mood>> getMoodRecords() async {
+    Database db = await instance.database;
+    var moodRecords = await db.query('mood');
+    List<Mood> moodList = moodRecords.isNotEmpty
+        ? moodRecords.map((e) => Mood.fromDatabase(e)).toList()
+        : [];
+    return moodList;
+  }
+
+  Future<List<Sleep>> getSleepRecords() async {
+    Database db = await instance.database;
+    var sleepRecords = await db.query('sleep');
+    List<Sleep> sleepList = sleepRecords.isNotEmpty
+        ? sleepRecords.map((e) => Sleep.fromDatabase(e)).toList()
+        : [];
+    return sleepList;
+  }
+
+  Future<int> addMood(Mood mood) async {
+    Database db = await instance.database;
+    return await db.insert('mood', mood.toMap());
+  }
+
+  Future<int> addSleep(Sleep sleep) async {
+    Database db = await instance.database;
+    return await db.insert('sleep', sleep.toMap());
+  }
+}
+
+String _createMoodTable = '''
+      CREATE TABLE IF NOT EXISTS mood(
+        id INTEGER PRIMARY KEY,
+        value INTEGER,
+        date TEXT,
+        comment TEXT
+      )
+    ''';
+
+String _createSleepTable = '''
+      CREATE TABLE IF NOT EXISTS sleep(
+        id INTEGER PRIMARY KEY,
+        value INTEGER,
+        date TEXT,
+        comment TEXT,
+        sleepedAtHour INTEGER,
+        sleepedAtMinute INTEGER,
+        wokeUpAtHour INTEGER,
+        wokeUpAtMinute INTEGER
+      )
+    ''';
+
+String _createRelapseTable = '''
+      CREATE TABLE IF NOT EXISTS relapse(
+        id INTEGER PRIMARY KEY,
+        date TEXT,
+        comment TEXT,
+        reason TEXT
+      )
+    ''';
+
+String _createWorkoutTable = '''
+      CREATE TABLE IF NOT EXISTS workout(
+        id INTEGER PRIMARY KEY,
+        date TEXT,
+        motivationBefore INTEGER,
+        commentBefore TEXT,
+        motivationAfter INTEGER,
+        commentAfter TEXT,
+        completed INTEGER
+      )
+    ''';
diff --git a/lib/services/date_service.dart b/lib/services/date_service.dart
new file mode 100644
index 0000000..61e0567
--- /dev/null
+++ b/lib/services/date_service.dart
@@ -0,0 +1,63 @@
+import 'package:smoke_cess_app/services/settings_service.dart';
+import 'package:timezone/timezone.dart';
+
+const int trainingTime = 40;
+
+const weekDays = {
+  "Montag": 1,
+  "Dienstag": 2,
+  "Mittwoch": 3,
+  "Donnerstag": 4,
+  "Freitag": 5,
+  "Samstag": 6,
+  "Sonntag": 7,
+};
+
+Future<List<TZDateTime>> getDatesforAll() async {
+  List<TZDateTime> allDates = [];
+  List<TZDateTime> moodDates = await getDatesforMood();
+  List<TZDateTime> sleepDates = await getDatesforSleep();
+  allDates.addAll(moodDates);
+  allDates.addAll(sleepDates);
+  return allDates;
+}
+
+Future<List<TZDateTime>> getDatesforMood() async {
+  final List<String>? selectedDays = await getMoodQueryDaysCategories();
+  final int? selectedHours = await getMoodQueryHours();
+  final int? selectedMinutes = await getMoodQueryMinutes();
+  return createTZDateTimes(selectedDays, selectedHours, selectedMinutes);
+}
+
+Future<List<TZDateTime>> getDatesforSleep() async {
+  final List<String>? selectedDays = await getSleepQueryDaysCategories();
+  final int? selectedHours = await getSleepQueryHours();
+  final int? selectedMinutes = await getSleepQueryMinutes();
+  return createTZDateTimes(selectedDays, selectedHours, selectedMinutes);
+}
+
+List<TZDateTime> createTZDateTimes(
+    List<String>? selectedDays, int? selectedHours, int? selectedMinutes) {
+  final List<TZDateTime> tzDateTimes = [];
+  final DateTime now = DateTime.now();
+  final Duration offset = now.timeZoneOffset;
+  if (selectedDays == null ||
+      selectedHours == null ||
+      selectedMinutes == null) {
+    return tzDateTimes;
+  }
+  final Iterable<int?> selectedDaysInt =
+      selectedDays.map((day) => weekDays[day]);
+  for (int i = 0; i < trainingTime; i++) {
+    final DateTime date = DateTime(now.year, now.month, now.day, selectedHours,
+            selectedMinutes, 0, 0, 0)
+        .add(Duration(days: i));
+    if (selectedDaysInt.contains(date.weekday) &&
+        date.isAfter(DateTime.now())) {
+      tzDateTimes.add(TZDateTime.local(date.year, date.month, date.day,
+              selectedHours, selectedMinutes, 0, 0, 0)
+          .subtract(offset));
+    }
+  }
+  return tzDateTimes;
+}
diff --git a/lib/services/notification_service.dart b/lib/services/notification_service.dart
new file mode 100644
index 0000000..ea65122
--- /dev/null
+++ b/lib/services/notification_service.dart
@@ -0,0 +1,105 @@
+import 'package:flutter_local_notifications/flutter_local_notifications.dart';
+import 'package:smoke_cess_app/services/date_service.dart';
+import 'package:timezone/timezone.dart';
+
+class NotificationService {
+  static final NotificationService _notificationService =
+      NotificationService._internal();
+
+  factory NotificationService() {
+    return _notificationService;
+  }
+
+  final FlutterLocalNotificationsPlugin flutterLocalNotificationsPlugin =
+      FlutterLocalNotificationsPlugin();
+
+  NotificationService._internal();
+
+  Future<void> initNotification() async {
+    // Android initialization
+    const AndroidInitializationSettings initializationSettingsAndroid =
+        AndroidInitializationSettings('mipmap/ic_launcher');
+
+    // ios initialization
+    const DarwinInitializationSettings initializationSettingsIOS =
+        DarwinInitializationSettings(
+      requestAlertPermission: false,
+      requestBadgePermission: false,
+      requestSoundPermission: false,
+    );
+
+    const InitializationSettings initializationSettings =
+        InitializationSettings(
+            android: initializationSettingsAndroid,
+            iOS: initializationSettingsIOS);
+    // the initialization settings are initialized after they are setted
+    await flutterLocalNotificationsPlugin.initialize(initializationSettings);
+  }
+
+  Future<void> showNotification() async {
+    await flutterLocalNotificationsPlugin.show(
+      0,
+      'test',
+      'test',
+//schedule the notification to show after 2 seconds.
+      const NotificationDetails(
+        // Android details
+        android: AndroidNotificationDetails('main_channel', 'Main Channel',
+            channelDescription: "ashwin",
+            importance: Importance.max,
+            priority: Priority.max),
+        // iOS details
+        iOS: DarwinNotificationDetails(
+          sound: 'default.wav',
+          presentAlert: true,
+          presentBadge: true,
+          presentSound: true,
+        ),
+      ),
+    );
+  }
+
+  Future<void> setAllNotifications() async {
+    List<TZDateTime> moodDates = await getDatesforMood();
+    List<TZDateTime> sleepDates = await getDatesforSleep();
+    int index = 0;
+    for (var date in moodDates) {
+      setNotification(index, "Mood", "Evaluate your mood", date);
+      index++;
+    }
+    for (var date in sleepDates) {
+      setNotification(index, "Sleep", "Evaluate your sleep", date);
+      index++;
+    }
+  }
+
+  Future<void> setNotification(
+      int id, String title, String body, TZDateTime tzDateTime) async {
+    await flutterLocalNotificationsPlugin.zonedSchedule(
+      id,
+      title,
+      body,
+      tzDateTime, //schedule the notification to show after 2 seconds.
+      const NotificationDetails(
+        // Android details
+        android: AndroidNotificationDetails('main_channel', 'Main Channel',
+            channelDescription: "ashwin",
+            importance: Importance.max,
+            priority: Priority.max),
+        // iOS details
+        iOS: DarwinNotificationDetails(
+          sound: 'default.wav',
+          presentAlert: true,
+          presentBadge: true,
+          presentSound: true,
+        ),
+      ),
+
+      // Type of time interpretation
+      uiLocalNotificationDateInterpretation:
+          UILocalNotificationDateInterpretation.absoluteTime,
+      androidAllowWhileIdle:
+          true, // To show notification even when the app is closed
+    );
+  }
+}
diff --git a/lib/services/settings_service.dart b/lib/services/settings_service.dart
new file mode 100644
index 0000000..52028bd
--- /dev/null
+++ b/lib/services/settings_service.dart
@@ -0,0 +1,67 @@
+import 'package:shared_preferences/shared_preferences.dart';
+import 'package:smoke_cess_app/models/settings.dart';
+import 'package:smoke_cess_app/services/json_service.dart';
+
+//access group setting which was saved in local storage
+Future<int?> getGroup() => _getIntSetting('group');
+
+Future<List<String>?> getRelapseCategories() =>
+    _getStringListSetting('relapse_categories');
+
+Future<List<String>?> getSleepQueryDaysCategories() =>
+    _getStringListSetting('sleep_query_days');
+
+Future<int?> getSleepQueryHours() => _getIntSetting('sleep_query_hours');
+Future<int?> getSleepQueryMinutes() => _getIntSetting('sleep_query_minutes');
+
+Future<List<String>?> getMoodQueryDaysCategories() =>
+    _getStringListSetting('mood_query_days');
+
+Future<int?> getMoodQueryHours() => _getIntSetting('mood_query_hours');
+Future<int?> getMoodQueryMinutes() => _getIntSetting('mood_query_minutes');
+
+Future<int?> getChessHours() => _getIntSetting('chess_hours');
+Future<int?> getChessMinutes() => _getIntSetting('chess_minutes');
+
+void _setStringSetting(String settingKey, String settingValue) =>
+    SharedPreferences.getInstance()
+        .then((pref) => pref.setString(settingKey, settingValue));
+
+Future<String?> _getStringSetting(String settingKey) =>
+    SharedPreferences.getInstance().then((pref) => pref.getString(settingKey));
+
+void _setIntSetting(String settingKey, int settingValue) =>
+    SharedPreferences.getInstance()
+        .then((pref) => pref.setInt(settingKey, settingValue));
+
+Future<int?> _getIntSetting(String settingKey) =>
+    SharedPreferences.getInstance().then((pref) => pref.getInt(settingKey));
+
+void _setStringListSetting(String settingKey, List<String> list) =>
+    SharedPreferences.getInstance()
+        .then((pref) => pref.setStringList(settingKey, list));
+
+Future<List<String>?> _getStringListSetting(String settingKey) =>
+    SharedPreferences.getInstance()
+        .then((pref) => pref.getStringList(settingKey));
+
+Future<void> loadSettingsFromLocalJSON() async {
+  Map<String, dynamic> configJSON = await loadLocalConfigJSON();
+  Settings settings = Settings.fromJson(configJSON);
+  saveSettings(settings);
+}
+
+void saveSettings(Settings settings) {
+  _setIntSetting('group', settings.group);
+  _setStringListSetting('relapse_categories', settings.relapseCategories!);
+  _setStringListSetting('mood_query_days', settings.moodQuery.days!);
+  _setIntSetting('mood_query_hours', settings.moodQuery.hours);
+  _setIntSetting('mood_query_minutes', settings.moodQuery.minutes);
+  _setStringListSetting('sleep_query_days', settings.sleepQuery.days!);
+  _setIntSetting('sleep_query_hours', settings.sleepQuery.hours);
+  _setIntSetting('sleep_query_minutes', settings.sleepQuery.minutes);
+  if (settings.chessTime != null) {
+    _setIntSetting('chess_hours', settings.chessTime!.hours);
+    _setIntSetting('chess_minutes', settings.chessTime!.minutes);
+  }
+}
diff --git a/lib/widgets/mood_form.dart b/lib/widgets/mood_form.dart
index f6fd0e0..c859d3f 100644
--- a/lib/widgets/mood_form.dart
+++ b/lib/widgets/mood_form.dart
@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:smoke_cess_app/models/mood.dart';
-import 'package:smoke_cess_app/service/database_service.dart';
+import 'package:smoke_cess_app/services/database_service.dart';
 import 'package:smoke_cess_app/widgets/slider.dart';
 import 'package:smoke_cess_app/widgets/submit_form_button.dart';
 import 'package:smoke_cess_app/widgets/text_formfield.dart';
diff --git a/lib/widgets/sleep_form.dart b/lib/widgets/sleep_form.dart
index eb86e89..a36318e 100644
--- a/lib/widgets/sleep_form.dart
+++ b/lib/widgets/sleep_form.dart
@@ -1,6 +1,6 @@
 import 'package:flutter/material.dart';
 import 'package:smoke_cess_app/models/sleep.dart';
-import 'package:smoke_cess_app/service/database_service.dart';
+import 'package:smoke_cess_app/services/database_service.dart';
 import 'package:smoke_cess_app/widgets/elevated_card.dart';
 import 'package:smoke_cess_app/widgets/slider.dart';
 import 'package:smoke_cess_app/widgets/submit_form_button.dart';