schedule explicit set levels

backend/database/seeders/SetLevelSeeder.php

@@ -0,0 +1,45 @@
+<?php
+
+namespace Database\Seeders;
+
+use App\Set\CreateSetLevelDto;
+use App\Set\SetLevelRepository;
+use App\Set\SetRepository;
+use Illuminate\Database\Seeder;
+
+class SetLevelSeeder extends Seeder
+{
+    private const array KINDS_BY_SET = [
+        'Bible' => ['book', 'portion', 'chapter'],
+        'Course' => ['module', 'lesson'],
+        'Fitness Program' => ['phase', 'workout', 'exercise'],
+    ];
+
+    public function run(): void
+    {
+        $repository = app(SetLevelRepository::class);
+
+        foreach (app(SetRepository::class)->all() as $set) {
+            $kinds = self::KINDS_BY_SET[$set->getName()] ?? null;
+            if ($kinds === null) {
+                continue;
+            }
+
+            $existingKinds = array_map(function ($level): string {
+                return $level->getKind();
+            }, $repository->findBySet($set));
+
+            foreach ($kinds as $kind) {
+                if (in_array($kind, $existingKinds, true)) {
+                    continue;
+                }
+
+                $repository->create(new CreateSetLevelDto(
+                    set: $set,
+                    kind: $kind,
+                ));
+                $existingKinds[] = $kind;
+            }
+        }
+    }
+}