ADD : User login (password verification + username) and notification if there is a problem

Sources/dafl_project_flutter/lib/controller/controller.dart

@@ -31,8 +31,8 @@ class Controller{
     saver.save(userToSave);
   }
 
-  void load(String username, String password) async{
-    currentUser =  await loader.load(username, password) as User;
+  Future<void> load(String username, String password) async{
+    changeCurrentUser(await loader.load(username, password));
   }
 
   User createUser(String username, String password){

Sources/dafl_project_flutter/lib/model/user.dart

@@ -92,5 +92,5 @@ class User{
   }
 
   @override
-  String toString() => "$usernameDafl ($idDafl)";
+  String toString() => "$usernameDafl ($passwDafl)";
 }

Sources/dafl_project_flutter/lib/persistence/database_loader.dart

@@ -9,20 +9,19 @@ class DatabaseLoader extends Loader{
 
   // Load an user from database
   @override
-  Future<User?> load(String username, String password) async {
-    User? userToReturn = null;
+  Future<User> load(String username, String password) async {
     final connection = await DatabaseConnexion.initConnexion();
 
-    connection.query('select * from utilisateur where username = @username AND password = @password',
+    var queryResult = await connection.query('select * from utilisateur where username = @username AND password = @password',
         {'username': username,
           'password': password}).toList()
         .then((result) {
-          if(result.isNotEmpty){
-            userToReturn =  User(username, password);
-          }
+          print(result);
+          if(result.isNotEmpty) return User(username, password);
+          else return User("", "");
         }).whenComplete(() {
       connection.close();});
 
-    return userToReturn;
+    return queryResult;
   }
 }

Sources/dafl_project_flutter/lib/persistence/database_searcher.dart

@@ -16,7 +16,8 @@ class DatabaseSearcher extends Searcher{
 
     bool queryResult = await connection.query('select * from utilisateur where username = @username',{ 'username' : usernameToSearch})
         .toList()
-        .then((rows) { return rows.isEmpty; });
+        .then((rows) { return rows.isEmpty; }).whenComplete(() {
+      connection.close();});
 
 
     return queryResult;

Sources/dafl_project_flutter/lib/persistence/loader.dart

@@ -3,5 +3,5 @@ import 'dart:async';
 import '../model/user.dart';
 
 abstract class Loader{
-  Future<User?> load(String username, String password);
+  Future<User> load(String username, String password);
 }

Sources/dafl_project_flutter/lib/views/pages/sign_in/p_sign_in.dart

@@ -229,7 +229,7 @@ class _SignInPageState extends State<SignInPage> {
   }
 
 
-  void checkInformations(String username,String password){
+  void checkInformations(String username,String password) async{
     if(username ==""){
       Notify(2, context);
     }
@@ -237,14 +237,21 @@ class _SignInPageState extends State<SignInPage> {
       Notify(4, context);
     }
     else{
-      //MyApp().controller.load(userNameTextField.text, passwordTextField.text);
-      MyApp().controller.currentUser = User(username, password);
-      Navigator.of(context).push(
-        PageTransition(
-            type: PageTransitionType.fade,
-            childCurrent: widget,
-            child: Splash()),
-      );
+      await MyApp().controller.load(userNameTextField.text, passwordTextField.text);
+
+      if(MyApp().controller.currentUser.usernameDafl != ""){
+        Navigator.of(context).push(
+          PageTransition(
+              type: PageTransitionType.fade,
+              childCurrent: widget,
+              child: Splash()),
+        );
+      }
+      else{
+        Notify(2, context);
+      }
+
+
 
       }
   }

Sources/dafl_project_flutter/lib/views/pages/sign_up/p_sign_up.dart

@@ -300,7 +300,6 @@ class _SignUpPageState extends State<SignUpPage> {
 
 
   Future<void> checkInformations(String username, String password, String confirmPassword) async {
-
     if(username == ""){
       Notify(2, context);
     }