ajout message d'erreur sur login si le user ou password n'existe pas

What_The_Fantasy/app/src/main/java/com/example/what_the_fantasy/ui/screens/LoginPage.kt

@@ -5,14 +5,18 @@ import androidx.compose.foundation.background
 import androidx.compose.foundation.clickable
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.Row
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.height
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.text.KeyboardOptions
 import androidx.compose.material3.Button
 import androidx.compose.material3.ButtonDefaults
 import androidx.compose.material3.IconButton
+import androidx.compose.material3.MaterialTheme
 import androidx.compose.material3.OutlinedTextField
 import androidx.compose.material3.Text
 import androidx.compose.runtime.Composable
@@ -81,6 +85,8 @@ fun LoginPage(navControllerSignUp: () -> Unit, navControllerProfil: (Int) -> Uni
 }
 
 
+
+
 @Composable
 fun IdentifiantTextField(textIdentifiantResId : Int) : String{
     val textIdentifiant = stringResource(id = textIdentifiantResId)
@@ -129,31 +135,49 @@ fun PassWdTextField(textpasswdResId : Int) : String{
 @Composable
 fun ConnexionButtonLogin(userStub : List<User>, id : String, passwd : String, titleResId : Int, size : Int, colorButton : Color, colorText : Color, navController: (Int) -> Unit){
     val title = stringResource(id = titleResId)
-
+    var showError by remember { mutableStateOf(false) }
     Button(
-        onClick = { validLogin(id, passwd, userStub, navController) },
+        onClick = { showError = !validLogin(id, passwd, userStub, navController)
+                  },
         colors = ButtonDefaults.buttonColors(containerColor = colorButton),
         modifier = Modifier
             .fillMaxWidth(),
     ) {
         Text(title, fontSize = size.sp, color = colorText)
     }
+
+    if( showError){
+        ErrorMessage()
+    }
 }
 
 
-fun validLogin(identifiant : String, passwd : String, users : List<User>, navController: (Int) -> Unit){
+fun validLogin(identifiant : String, passwd : String, users : List<User>, navController: (Int) -> Unit): Boolean {
+
 
     users.forEachIndexed { index, user ->
         val hashPassWd = hashPassword(passwd)
         if (user.username == identifiant && user.password == hashPassWd) {
             // Utilise l'index pour naviguer à la position correspondante
             navController(index) // Passer l'index à la fonction navController
+            return true
         }
+
     }
-}
 
+    return false
+
+}
+@Composable
+fun ErrorMessage() {
+    Text(
+        text = "Username or Password does not exist.",
+        color = Color.Red,
+        modifier = Modifier.padding(top = 8.dp)
+    )
+}
 @Composable
-fun CreateAccountButton(titleResId : Int, size : Int, color : Color, navController: () -> Unit){
+fun CreateAccountButton(titleResId : Int, size : Int, color : Color, navController: () -> Unit) {
     val title = stringResource(id = titleResId)
     Text(
         text = title,