Bold the correct answer in the raw answers export sheet (#208)

Makes it easy to visually spot which answer was correct when scanning
the GDPR export's per-candidate/per-question crosstab.

src/Service/DataExportService.php

@@ -223,7 +223,7 @@ class DataExportService
         }
     }
 
-    /** Raw crosstab: one row per candidate, one column per question, cell = the answer text they gave. */
+    /** Raw crosstab: one row per candidate, one column per question, cell = the answer text they gave (bold when correct). */
     private function fillRawAnswersSheet(Worksheet $sheet, Quiz $quiz): void
     {
         /** @var list<Question> $questions */
@@ -240,11 +240,14 @@ class DataExportService
 
         /** @var array<string, array<string, string>> $answersByCandidateAndQuestion */
         $answersByCandidateAndQuestion = [];
+        /** @var array<string, array<string, bool>> $correctnessByCandidateAndQuestion */
+        $correctnessByCandidateAndQuestion = [];
         foreach ($questions as $question) {
             foreach ($question->answers as $answer) {
                 foreach ($answer->givenAnswers as $givenAnswer) {
                     $candidateId = $givenAnswer->candidate->id->toString();
                     $answersByCandidateAndQuestion[$candidateId][$question->id->toString()] = $answer->text;
+                    $correctnessByCandidateAndQuestion[$candidateId][$question->id->toString()] = $answer->isRightAnswer;
                 }
             }
         }
@@ -252,13 +255,22 @@ class DataExportService
         $row = 2;
         foreach ($quiz->candidateData as $quizCandidate) {
             $candidate = $quizCandidate->candidate;
+            $candidateId = $candidate->id->toString();
 
             $line = [$candidate->name];
             foreach ($questions as $question) {
-                $line[] = $answersByCandidateAndQuestion[$candidate->id->toString()][$question->id->toString()] ?? '';
+                $line[] = $answersByCandidateAndQuestion[$candidateId][$question->id->toString()] ?? '';
             }
 
             $sheet->fromArray($line, null, 'A'.$row);
+
+            foreach ($questions as $columnIndex => $question) {
+                if ($correctnessByCandidateAndQuestion[$candidateId][$question->id->toString()] ?? false) {
+                    $column = Coordinate::stringFromColumnIndex(2 + $columnIndex);
+                    $sheet->getStyle($column.$row)->getFont()->setBold(true);
+                }
+            }
+
             ++$row;
         }
 

tests/Service/DataExportServiceTest.php

@@ -4,6 +4,7 @@ declare(strict_types=1);
 
 namespace Tvdt\Tests\Service;
 
+use PhpOffice\PhpSpreadsheet\Cell\Coordinate;
 use PhpOffice\PhpSpreadsheet\Reader;
 use PhpOffice\PhpSpreadsheet\Worksheet\Worksheet;
 use PHPUnit\Framework\Attributes\CoversClass;
@@ -201,6 +202,50 @@ final class DataExportServiceTest extends DatabaseTestCase
         $this->assertSame('Man', $claudiaRow[$questionColumnIndex]);
     }
 
+    public function testRawAnswersSheetBoldsCorrectAnswersOnly(): void
+    {
+        $season = $this->getSeasonByCode('krtek');
+        $quiz = $this->entityManager->getRepository(Quiz::class)->findOneBy(['name' => 'Quiz 1', 'season' => $season]);
+        $this->assertInstanceOf(Quiz::class, $quiz);
+
+        /** @var Question $firstQuestion */
+        $firstQuestion = $quiz->questions->first();
+        $correctAnswer = $firstQuestion->answers->filter(static fn (Answer $answer): bool => $answer->isRightAnswer)->first();
+        $wrongAnswer = $firstQuestion->answers->filter(static fn (Answer $answer): bool => !$answer->isRightAnswer)->first();
+        $this->assertInstanceOf(Answer::class, $correctAnswer);
+        $this->assertInstanceOf(Answer::class, $wrongAnswer);
+
+        $candidateWithCorrectAnswer = $this->getCandidateBySeasonAndName($season, 'Claudia');
+        $candidateWithWrongAnswer = $this->getCandidateBySeasonAndName($season, 'Eelco');
+
+        $this->quizCandidateRepository->createIfNotExist($quiz, $candidateWithCorrectAnswer);
+        $this->quizCandidateRepository->createIfNotExist($quiz, $candidateWithWrongAnswer);
+
+        $this->entityManager->persist(new GivenAnswer($candidateWithCorrectAnswer, $quiz, $correctAnswer));
+        $this->entityManager->persist(new GivenAnswer($candidateWithWrongAnswer, $quiz, $wrongAnswer));
+        $this->entityManager->flush();
+
+        $zip = $this->openZip($this->getUserByEmail('user2@example.org'));
+        $quizContent = $zip->getFromName('krtek-Krtek-Weekend/Quiz-1.xlsx');
+        $this->assertIsString($quizContent);
+        $zip->close();
+
+        $sheet = $this->loadSheet($quizContent, 'Raw answers');
+        $rows = $sheet->toArray();
+        $header = $rows[0];
+
+        $questionColumnIndex = array_search($firstQuestion->question, $header, true);
+        $this->assertIsInt($questionColumnIndex);
+        $column = Coordinate::stringFromColumnIndex($questionColumnIndex + 1);
+
+        $candidateNames = array_column(\array_slice($rows, 1), 0);
+        $correctRowNumber = 2 + array_search('Claudia', $candidateNames, true);
+        $wrongRowNumber = 2 + array_search('Eelco', $candidateNames, true);
+
+        $this->assertTrue($sheet->getStyle($column.$correctRowNumber)->getFont()->getBold(), 'Expected the correct answer to be bold');
+        $this->assertFalse($sheet->getStyle($column.$wrongRowNumber)->getFont()->getBold(), 'Expected the wrong answer to not be bold');
+    }
+
     public function testQuizInfoSheetShowsDropoutsFinalizationAndDisabledQuestions(): void
     {
         $season = $this->getSeasonByCode('krtek');