Implement quizToXlsx() export and add export button

- QuizSpreadsheetService: implement quizToXlsx() as the inverse of
  fillQuizFromArray() — writes quiz questions and answers to XLSX using
  the same column layout as the import template
- BackofficeController: add exportQuiz() action at GET /backoffice/quiz/{quiz}/export
- tab_overview.html.twig: add Export to XLSX button in Quick actions

src/Controller/Backoffice/BackofficeController.php

@@ -11,12 +11,15 @@ use Symfony\Component\HttpFoundation\Response;
 use Symfony\Component\HttpFoundation\StreamedResponse;
 use Symfony\Component\HttpKernel\Attribute\AsController;
 use Symfony\Component\Routing\Attribute\Route;
+use Symfony\Component\Routing\Requirement\Requirement;
 use Symfony\Component\Security\Http\Attribute\IsGranted;
 use Tvdt\Controller\AbstractController;
+use Tvdt\Entity\Quiz;
 use Tvdt\Entity\Season;
 use Tvdt\Entity\User;
 use Tvdt\Form\CreateSeasonFormType;
 use Tvdt\Repository\SeasonRepository;
+use Tvdt\Security\Voter\SeasonVoter;
 use Tvdt\Service\QuizSpreadsheetService;
 
 #[AsController]
@@ -78,4 +81,20 @@ final class BackofficeController extends AbstractController
 
         return $response;
     }
+
+    #[IsGranted(SeasonVoter::EDIT, subject: 'quiz')]
+    #[Route(
+        '/backoffice/quiz/{quiz}/export',
+        name: 'tvdt_backoffice_quiz_export',
+        requirements: ['quiz' => Requirement::UUID],
+        methods: ['GET'],
+    )]
+    public function exportQuiz(Quiz $quiz): StreamedResponse
+    {
+        $response = new StreamedResponse($this->excel->quizToXlsx($quiz));
+        $response->headers->set('Content-Type', 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet');
+        $response->headers->set('Content-Disposition', 'attachment; filename="'.$quiz->name.'.xlsx"');
+
+        return $response;
+    }
 }

src/Service/QuizSpreadsheetService.php

@@ -120,9 +120,47 @@ class QuizSpreadsheetService
         }
     }
 
-    public function quizToXlsx(Quiz $quiz): void
+    public function quizToXlsx(Quiz $quiz): \Closure
     {
-        throw new \Exception('Not implemented');
+        $spreadsheet = new Spreadsheet();
+        $sheet = $spreadsheet->getActiveSheet();
+
+        $sheet->getStyle('1:1')->getFont()->setBold(true);
+
+        $sheet->setCellValue('A1', 'Question');
+        $sheet->getColumnDimension('A')->setWidth(30);
+        $sheet->getStyle('A:A')->getAlignment()->setWrapText(true);
+
+        $counter = 1;
+        foreach (range('B', 'L', 2) as $column) {
+            $sheet->setCellValue($column.'1', 'Answer '.$counter++);
+            $sheet->getColumnDimension($column)->setWidth(30);
+            $sheet->getStyle($column.':'.$column)->getAlignment()->setWrapText(true);
+        }
+
+        foreach (range('C', 'M', 2) as $column) {
+            $sheet->setCellValue($column.'1', 'Correct');
+            $sheet->getColumnDimension($column)->setAutoSize(true);
+        }
+
+        $answerColumns = range('B', 'L', 2);
+        $correctColumns = range('C', 'M', 2);
+
+        $row = 2;
+        foreach ($quiz->questions as $question) {
+            $sheet->setCellValue('A'.$row, $question->question);
+
+            $col = 0;
+            foreach ($question->answers as $answer) {
+                $sheet->setCellValue($answerColumns[$col].$row, $answer->text);
+                $sheet->setCellValue($correctColumns[$col].$row, $answer->isRightAnswer);
+                ++$col;
+            }
+
+            ++$row;
+        }
+
+        return $this->toXlsx($spreadsheet);
     }
 
     private function toXlsx(Spreadsheet $spreadsheet): \Closure

templates/backoffice/quiz/tab_overview.html.twig

@@ -49,6 +49,11 @@
         </button>
     </div>
 
+    <a class="btn btn-outline-secondary mb-3"
+       href="{{ path('tvdt_backoffice_quiz_export', {quiz: quiz.id}) }}">
+        {{ 'Export to XLSX'|trans }}
+    </a>
+
     <h4 class="mb-3">{{ 'Questions'|trans }}</h4>
     <div class="accordion">
         {%~ for question in quiz.questions ~%}