Added the remaining CRUD operations for events

lib/src/App.dart

@@ -5,7 +5,7 @@ import './models/task_model.dart';
 import './models/user_model.dart';
 import './resources/firestore_provider.dart';
 
-/* class App extends StatelessWidget {
+class App extends StatelessWidget {
   Widget build(BuildContext context) {
     final fire = FirestoreProvider();
     return MaterialApp(
@@ -19,9 +19,9 @@ import './resources/firestore_provider.dart';
       ),
     );
   }
-} */
+}
 
-class App extends StatelessWidget {
+/* class App extends StatelessWidget {
   Widget build(BuildContext context) {
     final fire = FirestoreProvider();
     return MaterialApp(
@@ -32,9 +32,9 @@ class App extends StatelessWidget {
           title: Text('DO>'),
         ),
         body: StreamBuilder(
-          stream: fire.getUserEvents('vBOvtmTeC8iPg8L4Hixh'),
-          builder: (BuildContext context,
-              AsyncSnapshot<List<EventModel>> userSnapshot) {
+          stream: fire.getEvent('vBOvtmTeC8iPg8L4Hixh', '-LZReccofbHpw9UfOTMk'),
+          builder:
+              (BuildContext context, AsyncSnapshot<EventModel> userSnapshot) {
             if (!userSnapshot.hasData) {
               return Center(
                 child: CircularProgressIndicator(),
@@ -51,11 +51,21 @@ class App extends StatelessWidget {
                     event: 'Math',
                   );
 
-                  fire.updateTask(
-                    '-LZRNhS9mX-SO0XgfQIM',
-                    done: true,
-                    text: 'Hellloooooo',
-                    priority: 1,
+                  final event = EventModel(
+                    name: 'Langs and trans',
+                    tasks: <String>[],
+                    highPriority: 0,
+                    mediumPriority: 0,
+                    lowPriority: 0,
+                    media: <String>[],
+                    when: <bool>[],
+                    pendigTasks: 0,
+                  );
+
+                  fire.updateEvent(
+                    'vBOvtmTeC8iPg8L4Hixh',
+                    '-LZReccofbHpw9UfOTMk',
+                    name: 'kjhahslkdjhf',
                   );
                 },
                 child: Text('Add task'),
@@ -63,9 +73,11 @@ class App extends StatelessWidget {
             ];
             //children.add(Text(userSnapshot.data.text));
 
-            userSnapshot.data.forEach((EventModel task) {
-              children.add(Text(task.name));
-            });
+            //userSnapshot.data.forEach((EventModel task) {
+            //  children.add(Text(task.name));
+            //});
+
+            children.add(Text(userSnapshot.data.name));
 
             return Column(
               children: children,
@@ -75,4 +87,4 @@ class App extends StatelessWidget {
       ),
     );
   }
-}
+} */

lib/src/models/event_model.dart

@@ -33,4 +33,17 @@ class EventModel {
         highPriority = firestoreMap["highPriority"],
         mediumPriority = firestoreMap["mediumPriority"],
         lowPriority = firestoreMap["lowPriority"];
+
+  Map<String, dynamic> toFirestoreMap() {
+    return <String, dynamic>{
+      "name": name,
+      "pendingTasks": pendigTasks,
+      "when": when,
+      "media": media,
+      "tasks": tasks,
+      "highPriority": highPriority,
+      "mediumPriority": mediumPriority,
+      "lowPriority": lowPriority,
+    };
+  }
 }

lib/src/resources/firestore_provider.dart

@@ -136,8 +136,79 @@ class FirestoreProvider {
   }
 
   //-----------------------Event related operations-----------------------------
+  // TODO: Change the Events collection name to 'events' in forestore.
 
-  // TODO: Change the Events collction name to 'events' in forestore.
+  /// Adds an event to firestore.
+  Future<void> addEvent(String userId, EventModel event) async {
+    try {
+      final dataMap = event.toFirestoreMap();
+      await firestore.collection('users/$userId/Events').add(dataMap);
+    } catch (e) {
+      print('Error adding Event to firestore: $e');
+    }
+  }
+
+  /// Returns a Stream of a single event.
+  Observable<EventModel> getEvent(String userId, String eventId) {
+    final mappedStream = firestore
+        .collection('users/$userId/Events')
+        .document(eventId)
+        .snapshots()
+        .map(
+      (DocumentSnapshot snapshot) {
+        return EventModel.fromFirestore(
+          snapshot.data,
+          id: snapshot.documentID,
+        );
+      },
+    );
+
+    return Observable(mappedStream);
+  }
+
+  Future<void> deleteEvent(String userId, String eventId) async {
+    try {
+      final documentReference =
+          firestore.document('users/$userId/Events/$eventId');
+      await documentReference.delete();
+    } catch (e) {
+      print('Error deleting event in firestore: $e');
+    }
+  }
+
+  Future<void> updateEvent(
+    String userId,
+    String eventId, {
+    String name,
+    int pendingtasks,
+    List<int> media,
+    List<String> tasks,
+    int highPriority,
+    int mediumPriority,
+    int lowPriority,
+  }) async {
+    final newData = <String, dynamic>{
+      'name': name,
+      'pendingtasks': pendingtasks,
+      'media': media,
+      'tasks': tasks,
+      'highPriority': highPriority,
+      'mediumPriority': mediumPriority,
+      'lowPriority': lowPriority,
+    };
+    newData.removeWhere((_, value) => value == null);
+
+    try {
+      final documentReference =
+          firestore.document('users/$userId/Events/$eventId');
+      await documentReference.setData(newData, merge: true);
+    } catch (e) {
+      print('Error while updating Event in Firestore: $e');
+    }
+  }
+
+  /// Returns a stream of [List<EventModel] that correspond to
+  /// a particular user.
   Observable<List<EventModel>> getUserEvents(String userDocumentId) {
     final mappedStream = firestore
         .collection('users')