feat: duplicate an accommodation booking into a new draft

addresses #869f6z44f

tests/Service/AccommodationBookingServiceTest.php

@@ -1121,6 +1121,57 @@ class AccommodationBookingServiceTest extends TestCase
         self::assertSame(['total' => 1000], $ctx->priceBreakdown);
     }
 
+    public function testDuplicatePersistsACopyAndLeavesTheOriginalAlone(): void
+    {
+        $booking = (new AccommodationBooking())
+            ->setGroupName('Skiclub Nord')
+            ->setPaxCount(30);
+        $booking->setStatus(AccommodationBookingStatus::Confirmed);
+
+        $persisted = null;
+        $entityManager = $this->createMock(EntityManagerInterface::class);
+        $entityManager->expects(self::once())
+            ->method('persist')
+            ->willReturnCallback(function (object $entity) use (&$persisted): void { $persisted = $entity; });
+        $entityManager->expects(self::once())->method('flush');
+
+        $service = $this->createServiceWithAccommodation(entityManager: $entityManager);
+
+        $copy = $service->duplicate($booking);
+
+        self::assertSame($persisted, $copy);
+        self::assertNotSame($booking, $copy);
+        self::assertSame(30, $copy->getPaxCount());
+        self::assertSame(AccommodationBookingStatus::Draft, $copy->getStatus());
+        self::assertSame(AccommodationBookingStatus::Confirmed, $booking->getStatus());
+        self::assertSame('Skiclub Nord', $booking->getGroupName());
+    }
+
+    public function testDuplicateMarksTheCopyByName(): void
+    {
+        $booking = (new AccommodationBooking())->setGroupName('Skiclub Nord');
+
+        $copy = $this->createServiceWithAccommodation()->duplicate($booking);
+
+        self::assertSame('Skiclub Nord (Kopie)', $copy->getGroupName());
+    }
+
+    public function testDuplicateNeverRecomputesThePrice(): void
+    {
+        // The copy has to show what the original was quoted at, not today's catalog prices.
+        $booking = new AccommodationBooking();
+        $booking->setPriceSnapshot(['total' => 500000], 480000, 'CHF', 1);
+
+        $breakdownCalculator = $this->createMock(AccommodationBookingBreakdownCalculator::class);
+        $breakdownCalculator->expects(self::never())->method('computeCurrent');
+
+        $copy = $this->createServiceWithAccommodation(breakdownCalculator: $breakdownCalculator)->duplicate($booking);
+
+        self::assertSame(['total' => 500000], $copy->getPriceBreakdown());
+        self::assertSame(480000, $copy->getTotalPrice());
+        self::assertSame('CHF', $copy->getPricingCurrency());
+    }
+
     private function createBookingWithContactData(): AccommodationBooking
     {
         return (new AccommodationBooking())