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app/Services/Ktm/KtmScopeService.php

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+<?php
+
+namespace App\Services\Ktm;
+
+use App\Models\Application;
+use App\Models\Position;
+use App\Models\StaffAssignment;
+use App\Models\User;
+use Illuminate\Database\Eloquent\Collection as EloquentCollection;
+use Illuminate\Support\Collection;
+
+class KtmScopeService
+{
+    /**
+     * @return EloquentCollection<int, StaffAssignment>
+     */
+    public function assignmentsFor(User $user): EloquentCollection
+    {
+        $ktmPosition = Position::query()->where('code', 'KTM')->first();
+
+        if ($ktmPosition === null) {
+            return new EloquentCollection;
+        }
+
+        return StaffAssignment::query()
+            ->with(['pusatMengundi', 'saluranMengundi', 'teamMembers.application', 'teamMembers.position'])
+            ->where('user_id', $user->id)
+            ->where('position_id', $ktmPosition->id)
+            ->where('status', 'active')
+            ->whereNotNull('saluran_mengundi_id')
+            ->get();
+    }
+
+    /**
+     * @return Collection<int, int>
+     */
+    public function assignmentIdsFor(User $user): Collection
+    {
+        return $this->assignmentsFor($user)
+            ->pluck('id')
+            ->map(fn (mixed $id): int => (int) $id)
+            ->values();
+    }
+
+    public function ownsAssignment(User $user, StaffAssignment $assignment): bool
+    {
+        return $this->assignmentIdsFor($user)->contains((int) $assignment->id);
+    }
+
+    public function canAccessApplication(User $user, Application $application): bool
+    {
+        return $application->selected_ktm_assignment_id !== null
+            && $this->assignmentIdsFor($user)->contains((int) $application->selected_ktm_assignment_id);
+    }
+}