ADD : methods to get messages from Firestore

TO DO : link to views

Sources/dafl_project_flutter/lib/controller/controller.dart

@@ -1,6 +1,6 @@
 import 'dart:convert';
 import 'package:dafl_project_flutter/model/message.dart';
-import 'package:dafl_project_flutter/services/message_database.dart';
+import 'package:dafl_project_flutter/firebase_services/message_database_services.dart';
 import 'package:flutter/cupertino.dart';
 import 'package:http/http.dart' as http;
 import '../persistence/database_loader.dart';
@@ -15,7 +15,7 @@ class Controller {
   static Saver saver = DatabaseSaver();
   static Loader loader = DatabaseLoader();
   static final Searcher _searcher = DatabaseSearcher();
-  final MessageDatabase _messageAccess = MessageDatabase();
+  final MessageDatabaseServices _messageAccess = MessageDatabaseServices();
 
   late BuildContext navigatorKey;
 

Sources/dafl_project_flutter/lib/firebase_services/message_database_services.dart

@@ -2,7 +2,7 @@ import 'package:dafl_project_flutter/model/message.dart';
 import 'package:cloud_firestore/cloud_firestore.dart';
 
 
-class MessageDatabase{
+class MessageDatabaseServices{
 
 
   String _getChatId(String idSender, String idReceiver){
@@ -27,4 +27,26 @@ class MessageDatabase{
     });
   }
 
+  Message _getMessage(DocumentSnapshot<Map<String, dynamic>> snapshot) {
+    var data = snapshot.data();
+    if (data == null)
+      throw Exception("no data in database");
+
+    return Message.fromMap(data);
+  }
+
+
+  List<Message> _getAllMessages(QuerySnapshot<Map<String, dynamic>> snapshot) {
+    return snapshot.docs.map((doc) {
+      return _getMessage(doc);
+    }).toList();
+  }
+
+  Stream<List<Message>> getMessage(String chatId) {
+    return FirebaseFirestore.instance
+        .collection('messages')
+        .doc(chatId)
+        .collection(chatId)
+        .snapshots().map(_getAllMessages);
+  }
 }