ADD : HashMap to message class and send methods

Sources/dafl_project_flutter/lib/model/message.dart

@@ -1,8 +1,31 @@
 import 'user.dart';
 
 class Message {
-  String senderId;
+  String idSender;
+  String idReceiver;
   String content;
 
-  Message(this.senderId, this.content);
-}
+
+  Message({required this.idSender,
+    required this.idReceiver,
+    required this.content
+  });
+
+
+  Map<String, dynamic> toHashMap() {
+    return {
+      'idSender': idSender,
+      'idReceiver': idReceiver,
+      'content': content,
+    };
+  }
+
+
+  factory Message.fromMap(Map<String, dynamic> data){
+    return Message(
+      idSender: data['idSender'],
+      idReceiver: data['idReceiver'],
+      content: data['content'],
+    );
+  }
+}

Sources/dafl_project_flutter/lib/services/message_database/message_database.dart

@@ -0,0 +1,20 @@
+import 'package:dafl_project_flutter/model/message.dart';
+import 'package:cloud_firestore/cloud_firestore.dart';
+
+
+class MessageDatabase{
+
+
+  void SendMessage(String chatId, Message message) {
+    var documentReference = FirebaseFirestore.instance
+        .collection('messages')
+        .doc(chatId)
+        .collection(chatId)
+        .doc(DateTime.now().millisecondsSinceEpoch.toString());
+
+    FirebaseFirestore.instance.runTransaction((transaction) async {
+      transaction.set(documentReference,message.toHashMap());
+    });
+  }
+
+}