fix financial and certificates

app/Services/Grading/GradingLockService.php

@@ -5,9 +5,19 @@ namespace App\Services\Grading;
 use App\Models\GradingLock;
 use App\Models\ClassSection;
 use RuntimeException;
+use App\Services\Grading\Policy\GradingPolicyResolver;
+use App\Services\Grading\Validation\GradebookFinalizationValidator;
 
 class GradingLockService
 {
+    public function __construct(
+        private ?GradingPolicyResolver $policyResolver = null,
+        private ?GradebookFinalizationValidator $finalizationValidator = null
+    ) {
+        $this->policyResolver = $this->policyResolver ?? new GradingPolicyResolver();
+        $this->finalizationValidator = $this->finalizationValidator ?? new GradebookFinalizationValidator();
+    }
+
     public function toggle(int $classSectionId, string $semester, string $schoolYear, ?int $userId): bool
     {
         if ($classSectionId <= 0 || $semester === '' || $schoolYear === '') {
@@ -25,6 +35,8 @@ class GradingLockService
             return false;
         }
 
+        $this->assertCanLock($classSectionId, $semester, $schoolYear);
+
         if ($existing) {
             $existing->update([
                 'is_locked' => 1,
@@ -83,6 +95,8 @@ class GradingLockService
         $count = 0;
 
         foreach ($sectionIds as $sid) {
+            $this->assertCanLock($sid, $semester, $schoolYear);
+
             if (!empty($existingBySection[$sid])) {
                 if ($existingBySection[$sid]->is_locked) {
                     continue;
@@ -115,4 +129,18 @@ class GradingLockService
 
         return $count;
     }
+
+    private function assertCanLock(int $classSectionId, string $semester, string $schoolYear): void
+    {
+        $mode = $this->policyResolver->calculationMode($classSectionId, $semester, $schoolYear);
+        if ($mode !== GradingPolicyResolver::STRONG_MODE) {
+            return;
+        }
+
+        $result = $this->finalizationValidator->validateClassSectionBeforeLock($classSectionId, $semester, $schoolYear);
+        if (!$result['valid']) {
+            $count = count($result['errors']);
+            throw new RuntimeException("Cannot lock class section {$classSectionId}; strong grading validation failed with {$count} error(s).");
+        }
+    }
 }