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app/Services/Admin/PpmAssignmentService.php

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+<?php
+
+namespace App\Services\Admin;
+
+use App\Models\Position;
+use App\Models\PusatMengundi;
+use App\Models\StaffAssignment;
+use App\Models\User;
+use Illuminate\Support\Facades\DB;
+
+class PpmAssignmentService
+{
+    public function assign(PusatMengundi $pusatMengundi, User $user): StaffAssignment
+    {
+        return DB::transaction(function () use ($pusatMengundi, $user): StaffAssignment {
+            $position = Position::query()->where('code', 'PPM')->firstOrFail();
+
+            StaffAssignment::query()
+                ->where('election_id', $pusatMengundi->election_id)
+                ->where('pusat_mengundi_id', $pusatMengundi->id)
+                ->where('position_id', $position->id)
+                ->whereNull('saluran_mengundi_id')
+                ->where('status', 'active')
+                ->where('user_id', '!=', $user->id)
+                ->update(['status' => 'replaced']);
+
+            $assignment = StaffAssignment::query()->updateOrCreate(
+                [
+                    'election_id' => $pusatMengundi->election_id,
+                    'pusat_mengundi_id' => $pusatMengundi->id,
+                    'position_id' => $position->id,
+                    'saluran_mengundi_id' => null,
+                    'user_id' => $user->id,
+                ],
+                [
+                    'status' => 'active',
+                    'assigned_by_user_id' => auth()->id(),
+                    'assigned_at' => now(),
+                    'source' => 'admin_setup',
+                ],
+            );
+
+            $assignment->histories()->create([
+                'to_position_id' => $position->id,
+                'to_pusat_mengundi_id' => $pusatMengundi->id,
+                'changed_by_user_id' => auth()->id(),
+                'note' => 'PPM assigned from Admin setup module.',
+            ]);
+
+            $user->assignRole('PPM');
+
+            activity('admin_setup')
+                ->performedOn($assignment)
+                ->causedBy(auth()->user())
+                ->withProperties([
+                    'pusat_mengundi_id' => $pusatMengundi->id,
+                    'user_id' => $user->id,
+                    'position_code' => 'PPM',
+                ])
+                ->log('ppm_assigned');
+
+            return $assignment;
+        });
+    }
+}