app/src/main/java/com/example/notebook/MainActivity.kt

@@ -40,6 +40,10 @@ class MainActivity : ComponentActivity() {
 
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
+
+        // Initialize PDFBox
+        com.example.notebook.utils.PdfHelper.initialize(this)
+
         setContent {
             NotebookTheme {
                 Surface(
@@ -64,12 +68,21 @@ fun NotebookApp(viewModel: NotebookViewModel) {
     var chatInput by remember { mutableStateOf("") }
     var selectedNotebookId by remember { mutableIntStateOf(-1) }
 
+    // Log setiap kali selectedNotebookId berubah
+    LaunchedEffect(selectedNotebookId) {
+        println("🎯 selectedNotebookId berubah menjadi: $selectedNotebookId")
+    }
+
     // Kalau ada notebook yang dipilih, tampilkan detail screen
     if (selectedNotebookId != -1) {
+        println("✨ Menampilkan NotebookDetailScreen untuk ID: $selectedNotebookId")
         com.example.notebook.ui.screens.NotebookDetailScreen(
             viewModel = viewModel,
             notebookId = selectedNotebookId,
-            onBack = { selectedNotebookId = -1 }
+            onBack = {
+                println("⬅️ Kembali dari detail screen")
+                selectedNotebookId = -1
+            }
         )
         return
     }
@@ -149,7 +162,13 @@ fun NotebookApp(viewModel: NotebookViewModel) {
                 }
             }
             when (selectedTabIndex) {
-                0 -> StudioScreen(viewModel)
+                0 -> StudioScreen(
+                    viewModel = viewModel,
+                    onNotebookClick = { notebookId ->
+                        println("📱 Navigasi ke notebook ID: $notebookId")
+                        selectedNotebookId = notebookId
+                    }
+                )
                 1 -> ChatScreen(viewModel)
                 2 -> SourcesScreen(viewModel)
             }
@@ -159,7 +178,7 @@ fun NotebookApp(viewModel: NotebookViewModel) {
 
 // === STUDIO SCREEN (UPDATED) ===
 @Composable
-fun StudioScreen(viewModel: NotebookViewModel) {
+fun StudioScreen(viewModel: NotebookViewModel, onNotebookClick: (Int) -> Unit) {
     val notebooks by viewModel.notebooks.collectAsState()
     var showCreateDialog by remember { mutableStateOf(false) }
 
@@ -199,8 +218,14 @@ fun StudioScreen(viewModel: NotebookViewModel) {
             items(notebooks) { notebook ->
                 NotebookCard(
                     notebook = notebook,
-                    onClick = { /* TODO: Buka notebook */ },
-                    onDelete = { viewModel.deleteNotebook(notebook) }
+                    onClick = {
+                        println("🟢 onClick triggered untuk notebook ID: ${notebook.id}")
+                        onNotebookClick(notebook.id)
+                    },
+                    onDelete = {
+                        println("🔴 Delete triggered untuk notebook ID: ${notebook.id}")
+                        viewModel.deleteNotebook(notebook)
+                    }
                 )
             }
         }
@@ -246,11 +271,13 @@ fun NotebookCard(
     val dateFormat = SimpleDateFormat("dd MMM yyyy, HH:mm", Locale.getDefault())
 
     Card(
-        modifier = Modifier
-            .fillMaxWidth()
-            .clickable(onClick = onClick),
+        modifier = Modifier.fillMaxWidth(),
         shape = RoundedCornerShape(12.dp),
-        colors = CardDefaults.cardColors(containerColor = Color(0xFFF8F9FA))
+        colors = CardDefaults.cardColors(containerColor = Color(0xFFF8F9FA)),
+        onClick = {
+            println("🔵 Card onClick: ID=${notebook.id}, Title=${notebook.title}")
+            onClick()
+        }
     ) {
         Row(
             modifier = Modifier