feat: dedicated room pricing calculation for step 1 of create flow

src/Service/RoomPricingCalculator.php

@@ -15,6 +15,9 @@ use App\Form\Model\BookingDto;
  */
 class RoomPricingCalculator
 {
+    public const PRICING_MODE_ASSIGNMENT = 'assignment';
+    public const PRICING_MODE_SELECTION = 'selection';
+
     /**
      * Calculates pricing for all selected rooms.
      *
@@ -22,7 +25,10 @@ class RoomPricingCalculator
      *
      * @return array Array of room pricing data with labels, quantities, and totals
      */
-    public function calculateRoomPricing(BookingDto $bookingDto): array
+    public function calculateRoomPricing(
+        BookingDto $bookingDto,
+        string $pricingMode = self::PRICING_MODE_ASSIGNMENT,
+    ): array
     {
         // In edit mode, use room data from the booking entity
         if (BookingDto::MODE_EDIT === $bookingDto->getMode() && null !== $bookingDto->booking) {
@@ -30,15 +36,18 @@ class RoomPricingCalculator
         }
 
         // In create mode, use room selections from the form
-        return $this->calculateRoomPricingFromSelections($bookingDto);
+        return $this->calculateRoomPricingFromSelections($bookingDto, $pricingMode);
     }
 
     /**
      * Calculates total price for all rooms.
      */
-    public function calculateRoomTotal(BookingDto $bookingDto): float
+    public function calculateRoomTotal(
+        BookingDto $bookingDto,
+        string $pricingMode = self::PRICING_MODE_ASSIGNMENT,
+    ): float
     {
-        $roomPricing = $this->calculateRoomPricing($bookingDto);
+        $roomPricing = $this->calculateRoomPricing($bookingDto, $pricingMode);
 
         return array_sum(array_column($roomPricing, 'totalPrice'));
     }
@@ -68,7 +77,7 @@ class RoomPricingCalculator
      *
      * @return array Array of room pricing data
      */
-    private function calculateRoomPricingFromSelections(BookingDto $bookingDto): array
+    private function calculateRoomPricingFromSelections(BookingDto $bookingDto, string $pricingMode): array
     {
         $roomPricing = [];
         $selectedRooms = $bookingDto->getSelectedRooms();
@@ -85,8 +94,13 @@ class RoomPricingCalculator
                 continue;
             }
 
-            // Pricing in create flow is based on actual participant assignments per room.
-            $participantCount = $assignmentCounts[$room->id] ?? 0;
+            // Step 1 displays intended room pricing based on selected quantity and
+            // minimum room occupancy (minPax). Subsequent steps calculate based on
+            // actual participant assignments.
+            $participantCount = self::PRICING_MODE_SELECTION === $pricingMode
+                ? (($room->minPax ?? 1) * $roomSelection->quantity)
+                : ($assignmentCounts[$room->id] ?? 0)
+            ;
             $totalPrice = $participantCount * $room->price;
 
             $roomPricing[] = [