add controllers, servoices

app/Services/Assignment/AssignmentMetaService.php

@@ -0,0 +1,38 @@
+<?php
+
+namespace App\Services\Assignment;
+
+use Illuminate\Support\Facades\DB;
+
+class AssignmentMetaService
+{
+    public function getSchoolYears(string $fallbackYear = ''): array
+    {
+        $years = DB::table('teacher_class')
+            ->selectRaw('DISTINCT school_year')
+            ->whereNotNull('school_year')
+            ->orderByDesc('school_year')
+            ->pluck('school_year')
+            ->map(fn ($year) => (string) $year)
+            ->filter()
+            ->values()
+            ->all();
+
+        if (empty($years) && $fallbackYear !== '') {
+            $years[] = $fallbackYear;
+        }
+
+        return $years;
+    }
+
+    public function firstNonEmpty(array $values): mixed
+    {
+        foreach ($values as $value) {
+            if (filled($value)) {
+                return $value;
+            }
+        }
+
+        return null;
+    }
+}