adds validation

app/Http/Controllers/SessionController.php

@@ -11,6 +11,7 @@
 use Illuminate\Http\RedirectResponse;
 use Illuminate\Http\Request;
 use Illuminate\Support\Arr;
+use Illuminate\Validation\ValidationException;
 use Inertia\Inertia;
 use Inertia\Response;
 
@@ -109,6 +110,8 @@ private function saveAnswers(Session $session, array $answers): void
      */
     private function completeSession(Session $session): RedirectResponse
     {
+        $this->validateSessionCompletion($session);
+
         $scoringService = new ScoringService;
         $score = $scoringService->calculateScore($session);
         $result = $scoringService->determineResult($score);
@@ -125,6 +128,76 @@ private function completeSession(Session $session): RedirectResponse
         return redirect()->route('sessions.result', $session);
     }
 
+    /**
+     * Validate that all required fields are answered before session completion.
+     */
+    private function validateSessionCompletion(Session $session): void
+    {
+        $session->load(['category.questionGroups.questions', 'answers']);
+
+        $errors = [];
+
+        foreach ($session->category->questionGroups as $questionGroup) {
+            foreach ($questionGroup->questions as $question) {
+                $answer = $session->answers->firstWhere('question_id', $question->id);
+
+                $this->validateRadioAnswer($question, $answer, $errors);
+                $this->validateDetailsAnswer($question, $answer, $errors);
+            }
+        }
+
+        if (Arr::exists($errors, 0)) {
+            throw ValidationException::withMessages([
+                'complete' => $errors,
+            ]);
+        }
+    }
+
+    /**
+     * Validate that radio button questions have an answer selected.
+     */
+    private function validateRadioAnswer($question, $answer, array &$errors): void
+    {
+        $hasRadioButtons = $question->has_yes || $question->has_no || $question->has_na;
+
+        if ($hasRadioButtons && (! $answer || $answer->value === null)) {
+            $errors[] = "Question '{$question->text}' requires an answer.";
+        }
+    }
+
+    /**
+     * Validate that questions with required details have text values provided.
+     */
+    private function validateDetailsAnswer($question, $answer, array &$errors): void
+    {
+        $details = $question->details;
+        $hasRadioButtons = $question->has_yes || $question->has_no || $question->has_na;
+
+        if ($details === 'required') {
+            if (! $answer || empty(trim(Arr::get($answer->toArray(), 'text_value', '')))) {
+                $errors[] = "Question '{$question->text}' requires details to be provided.";
+            }
+        }
+
+        if ($details === 'req_on_yes' && $answer && $answer->value === 'yes') {
+            if (empty(trim(Arr::get($answer->toArray(), 'text_value', '')))) {
+                $errors[] = "Question '{$question->text}' requires details when answered 'Yes'.";
+            }
+        }
+
+        if ($details === 'req_on_no' && $answer && $answer->value === 'no') {
+            if (empty(trim(Arr::get($answer->toArray(), 'text_value', '')))) {
+                $errors[] = "Question '{$question->text}' requires details when answered 'No'.";
+            }
+        }
+
+        if (! $hasRadioButtons && $details !== null && $details !== '') {
+            if (! $answer || empty(trim(Arr::get($answer->toArray(), 'text_value', '')))) {
+                $errors[] = "Question '{$question->text}' requires a text response.";
+            }
+        }
+    }
+
     /**
      * Display the final session result.
      */