mais correções e implementações nos quizzes

lib/features/quiz/presentation/pages/quiz_list_page.dart

@@ -66,30 +66,24 @@ class _QuizListPageState extends State<QuizListPage>
         if (mounted) setState(() => _loadingTeacherQuizzes = false);
         return;
       }
-      final classSnaps = await Future.wait(
+      // Quizzes publicados para as turmas do aluno (array-contains-any, máx 10 por query)
-        classIds.map((id) => FirebaseFirestore.instance.collection('classes').doc(id).get()),
+      final classIdList = classIds.toList();
-      );
-      final teacherIds = classSnaps
-          .where((d) => d.exists)
-          .map((d) => d.data()?['teacherId'] as String?)
-          .whereType<String>()
-          .toSet()
-          .toList();
-      if (teacherIds.isEmpty) {
-        if (mounted) setState(() => _loadingTeacherQuizzes = false);
-        return;
-      }
-      // Quizzes publicados por esses professores (máx 10 teacherIds por query)
       final batches = <Future<QuerySnapshot>>[];
-      for (int i = 0; i < teacherIds.length; i += 10) {
+      for (int i = 0; i < classIdList.length; i += 10) {
         batches.add(FirebaseFirestore.instance
             .collection('teacherQuizzes')
-            .where('teacherId', whereIn: teacherIds.sublist(i, (i + 10).clamp(0, teacherIds.length)))
+            .where('classIds', arrayContainsAny: classIdList.sublist(i, (i + 10).clamp(0, classIdList.length)))
             .orderBy('createdAt', descending: true)
             .get());
       }
       final results = await Future.wait(batches);
-      final quizzes = results.expand((s) => s.docs).map((d) => {'id': d.id, ...d.data() as Map<String, dynamic>}).toList();
+      // deduplicar por id (pode aparecer em múltiplos batches)
+      final seen = <String>{};
+      final quizzes = results
+          .expand((s) => s.docs)
+          .where((d) => seen.add(d.id))
+          .map((d) => {'id': d.id, ...d.data() as Map<String, dynamic>})
+          .toList();
       if (mounted) setState(() { _teacherQuizzes = quizzes; _loadingTeacherQuizzes = false; });
     } catch (e) {
       Logger.error('Error loading teacher quizzes: $e');

lib/features/quiz/presentation/pages/teacher_quiz_page.dart

@@ -1,4 +1,5 @@
 import 'dart:convert';
+import 'dart:math';
 import 'package:flutter/material.dart';
 import 'package:go_router/go_router.dart';
 import 'package:cloud_firestore/cloud_firestore.dart';
@@ -56,6 +57,7 @@ class _TeacherQuizPageState extends State<TeacherQuizPage>
 
   List<Map<String, String>> _materials = [];
   List<Map<String, dynamic>> _history = [];
+  List<Map<String, String>> _teacherClasses = [];
   bool _loadingMaterials = true;
   bool _loadingHistory = true;
   String? _generatingForId;
@@ -66,6 +68,7 @@ class _TeacherQuizPageState extends State<TeacherQuizPage>
     _tabController = TabController(length: 2, vsync: this);
     _loadMaterials();
     _loadHistory();
+    _loadTeacherClasses();
   }
 
   @override
@@ -74,6 +77,24 @@ class _TeacherQuizPageState extends State<TeacherQuizPage>
     super.dispose();
   }
 
+  Future<void> _loadTeacherClasses() async {
+    try {
+      final uid = FirebaseAuth.instance.currentUser?.uid;
+      if (uid == null) return;
+      final snap = await FirebaseFirestore.instance
+          .collection('classes')
+          .where('teacherId', isEqualTo: uid)
+          .orderBy('createdAt', descending: true)
+          .get();
+      final classes = snap.docs
+          .map((d) => {'id': d.id, 'name': d.data()['name'] as String? ?? d.id})
+          .toList();
+      if (mounted) setState(() => _teacherClasses = classes);
+    } catch (e) {
+      Logger.error('Error loading teacher classes: $e');
+    }
+  }
+
   Future<void> _loadMaterials() async {
     try {
       final uid = FirebaseAuth.instance.currentUser?.uid;
@@ -128,13 +149,14 @@ class _TeacherQuizPageState extends State<TeacherQuizPage>
         return;
       }
 
+      final numQuestions = 5 + Random().nextInt(16); // 5..20
       final prompt =
           'Usa APENAS o seguinte contexto para criar um quiz. Não uses conhecimento externo.\n\n'
           '$pdfContext\n\n'
-          'Cria um quiz com 5 perguntas de escolha múltipla sobre o conteúdo acima.\n'
+          'Cria um quiz com EXACTAMENTE $numQuestions perguntas de escolha múltipla sobre o conteúdo acima. Não repitas perguntas.\n'
           'Responde SOMENTE com JSON válido, sem texto adicional, sem markdown, sem blocos de código.\n'
           'Formato exacto:\n'
-          '[{"q":"Pergunta aqui","opts":["A) opção","B) opção","C) opção","D) opção"],"ans":0,"exp":"Explicação breve da resposta correcta"},...]\n'
+          '[{"q":"Pergunta aqui","opts":["A) opção","B) opção","C) opção","D) opção"],"ans":0,"exp":"Explicação breve da resposta correcta"},...}]\n'
           'ans é o índice (0-3) da opção correcta.';
 
       final raw = await RAGAIService.generateQuiz(prompt);
@@ -153,6 +175,7 @@ class _TeacherQuizPageState extends State<TeacherQuizPage>
               materialName: matName,
               materialId: matId,
               questions: questions,
+              availableClasses: _teacherClasses,
             ),
           ),
         );
@@ -399,11 +422,13 @@ class _QuizEditorPage extends StatefulWidget {
   final String materialName;
   final String materialId;
   final List<_QuizQuestion> questions;
+  final List<Map<String, String>> availableClasses;
 
   const _QuizEditorPage({
     required this.materialName,
     required this.materialId,
     required this.questions,
+    required this.availableClasses,
   });
 
   @override
@@ -412,6 +437,7 @@ class _QuizEditorPage extends StatefulWidget {
 
 class _QuizEditorPageState extends State<_QuizEditorPage> {
   late List<_QuizQuestion> _questions;
+  final Set<String> _selectedClassIds = {};
   bool _saving = false;
 
   @override
@@ -426,6 +452,21 @@ class _QuizEditorPageState extends State<_QuizEditorPage> {
               explanation: q.explanation,
             ))
         .toList();
+    // selecionar todas as turmas por defeito
+    for (final c in widget.availableClasses) {
+      if (c['id'] != null) _selectedClassIds.add(c['id']!);
+    }
+  }
+
+  void _addBlankQuestion() {
+    setState(() {
+      _questions.add(_QuizQuestion(
+        question: '',
+        options: ['A) ', 'B) ', 'C) ', 'D) '],
+        correctIndex: 0,
+        explanation: '',
+      ));
+    });
   }
 
   Future<void> _publish() async {
@@ -439,6 +480,7 @@ class _QuizEditorPageState extends State<_QuizEditorPage> {
         'materialId': widget.materialId,
         'materialName': widget.materialName,
         'quizJson': jsonStr,
+        'classIds': _selectedClassIds.toList(),
         'createdAt': FieldValue.serverTimestamp(),
       });
       if (mounted) Navigator.of(context).pop(true);
@@ -474,22 +516,97 @@ class _QuizEditorPageState extends State<_QuizEditorPage> {
                   child: Center(child: SizedBox(width: 20, height: 20, child: CircularProgressIndicator(strokeWidth: 2))),
                 )
               : TextButton.icon(
-                  onPressed: _publish,
+                  onPressed: (widget.availableClasses.isEmpty || _selectedClassIds.isNotEmpty) ? _publish : null,
                   icon: const Icon(Icons.publish),
                   label: const Text('Publicar'),
                 ),
         ],
       ),
-      body: ListView.separated(
+      body: ListView.builder(
-        padding: const EdgeInsets.all(16),
+        padding: const EdgeInsets.fromLTRB(16, 16, 16, 32),
-        itemCount: _questions.length,
+        itemCount: _questions.length + 2, // +1 turmas header +1 add button
-        separatorBuilder: (_, __) => const SizedBox(height: 16),
+        itemBuilder: (context, i) {
-        itemBuilder: (context, i) => _QuestionEditor(
+          if (i == 0) return _buildClassSelector(cs);
-          index: i,
+          if (i == _questions.length + 1) {
-          question: _questions[i],
+            return Padding(
+              padding: const EdgeInsets.only(top: 8),
+              child: OutlinedButton.icon(
+                onPressed: _addBlankQuestion,
+                icon: const Icon(Icons.add),
+                label: const Text('Adicionar Pergunta'),
+                style: OutlinedButton.styleFrom(
+                  padding: const EdgeInsets.symmetric(vertical: 14),
+                  shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(12)),
+                ),
+              ),
+            );
+          }
+          final qIdx = i - 1;
+          return Padding(
+            padding: const EdgeInsets.only(bottom: 16),
+            child: _QuestionEditor(
+              index: qIdx,
+              question: _questions[qIdx],
               cs: cs,
               onChanged: () => setState(() {}),
+              onDelete: _questions.length > 1
+                  ? () => setState(() => _questions.removeAt(qIdx))
+                  : null,
             ),
+          );
+        },
+      ),
+    );
+  }
+
+  Widget _buildClassSelector(ColorScheme cs) {
+    if (widget.availableClasses.isEmpty) return const SizedBox(height: 0);
+    return Container(
+      margin: const EdgeInsets.only(bottom: 16),
+      padding: const EdgeInsets.all(16),
+      decoration: BoxDecoration(
+        color: cs.surface,
+        borderRadius: BorderRadius.circular(16),
+        border: Border.all(color: cs.outline.withValues(alpha: 0.2)),
+        boxShadow: [BoxShadow(color: cs.shadow.withValues(alpha: 0.05), blurRadius: 8, offset: const Offset(0, 2))],
+      ),
+      child: Column(
+        crossAxisAlignment: CrossAxisAlignment.start,
+        children: [
+          Row(
+            children: [
+              Icon(Icons.groups, color: cs.primary, size: 20),
+              const SizedBox(width: 8),
+              Text('Turmas com acesso',
+                  style: TextStyle(fontSize: 14, fontWeight: FontWeight.bold, color: cs.onSurface)),
+            ],
+          ),
+          const SizedBox(height: 12),
+          Wrap(
+            spacing: 8,
+            runSpacing: 8,
+            children: widget.availableClasses.map((c) {
+              final id = c['id']!;
+              final name = c['name'] ?? id;
+              final selected = _selectedClassIds.contains(id);
+              return FilterChip(
+                label: Text(name, style: TextStyle(fontSize: 13, color: selected ? cs.onPrimary : cs.onSurface)),
+                selected: selected,
+                onSelected: (v) => setState(() => v ? _selectedClassIds.add(id) : _selectedClassIds.remove(id)),
+                selectedColor: cs.primary,
+                checkmarkColor: cs.onPrimary,
+                backgroundColor: cs.surfaceContainerHighest.withValues(alpha: 0.5),
+                side: BorderSide(color: selected ? cs.primary : cs.outline.withValues(alpha: 0.3)),
+              );
+            }).toList(),
+          ),
+          if (_selectedClassIds.isEmpty)
+            Padding(
+              padding: const EdgeInsets.only(top: 8),
+              child: Text('Seleciona pelo menos uma turma.',
+                  style: TextStyle(fontSize: 12, color: cs.error)),
+            ),
+        ],
       ),
     );
   }
@@ -502,7 +619,8 @@ class _QuestionEditor extends StatefulWidget {
   final _QuizQuestion question;
   final ColorScheme cs;
   final VoidCallback onChanged;
-  const _QuestionEditor({required this.index, required this.question, required this.cs, required this.onChanged});
+  final VoidCallback? onDelete;
+  const _QuestionEditor({required this.index, required this.question, required this.cs, required this.onChanged, this.onDelete});
 
   @override
   State<_QuestionEditor> createState() => _QuestionEditorState();
@@ -580,6 +698,15 @@ class _QuestionEditorState extends State<_QuestionEditor> {
                       style: TextStyle(fontSize: 14, fontWeight: FontWeight.w600, color: cs.onSurface),
                     ),
                   ),
+                  if (widget.onDelete != null)
+                    IconButton(
+                      icon: Icon(Icons.delete_outline, color: cs.error, size: 18),
+                      padding: EdgeInsets.zero,
+                      constraints: const BoxConstraints(),
+                      onPressed: widget.onDelete,
+                      tooltip: 'Remover',
+                    ),
+                  const SizedBox(width: 4),
                   Icon(_expanded ? Icons.expand_less : Icons.expand_more, color: cs.onSurfaceVariant),
                 ],
               ),