Add PricePerHour to booking requests and update validation logic

Controllers/BookingController.cs

@@ -78,7 +78,8 @@ namespace Fitness_core_BE.Controllers
                 durationMinutes = request.DurationMinutes,
                 guestName = request.GuestName,
                 guestPhone = request.GuestPhone,
-                partySize = request.PartySize
+                partySize = request.PartySize,
+                pricePerHour = request.PricePerHour
             }, HttpContext));
 
         // The actual "copy the link and share it" page -- BookingDto.ShareUrl points here.

DTOs/Booking/BookingRequests.cs

@@ -52,6 +52,11 @@ namespace Fitness_core_BE.DTOs.Booking
         public string GuestPhone { get; set; } = string.Empty;
 
         public int? PartySize { get; set; }
+
+        /// <summary>Overrides the facility's own PricePerHour for this booking's charge only --
+        /// the FE pre-fills this from the facility but lets staff adjust it.</summary>
+        [Range(typeof(decimal), "0", "79228162514264337593543950335", ErrorMessage = "PricePerHour cannot be negative")]
+        public decimal? PricePerHour { get; set; }
     }
 
     public class MarkGuestBookingPaidRequest

Services/BookingService.cs

@@ -164,7 +164,7 @@ namespace Fitness_core_BE.Services
             await _uow.BeginAsync();
             try
             {
-                var (facility, startTime, endTime, partySize) = await ValidateAdhocRequestAsync(payload);
+                var (facility, startTime, endTime, partySize, _) = await ValidateAdhocRequestAsync(payload);
 
                 var cusId = await _userRoleHelper.GetCusId(DataExtractor.GetUserIdFromContext(httpContext));
 
@@ -202,7 +202,7 @@ namespace Fitness_core_BE.Services
             await _uow.BeginAsync();
             try
             {
-                var (facility, startTime, endTime, partySize) = await ValidateAdhocRequestAsync(payload);
+                var (facility, startTime, endTime, partySize, pricePerHour) = await ValidateAdhocRequestAsync(payload);
 
                 var data = DeserializePayload.Deserialize(payload);
                 var guestName = data["guestName"].GetString() ?? throw new ArgumentException("guestName is required");
@@ -223,7 +223,10 @@ namespace Fitness_core_BE.Services
                     GuestName = guestName,
                     GuestPhone = guestPhone,
                     OtpCode = GenerateOtp(),
-                    AmountCharged = Math.Round(facility.PricePerHour * durationHours, 2),
+                    // Staff can override the facility's default rate per booking (e.g. a discount)
+                    // -- the pre-filled suggestion in the FE comes from facility.PricePerHour, but
+                    // the charge actually uses whatever rate was submitted.
+                    AmountCharged = Math.Round((pricePerHour ?? facility.PricePerHour) * durationHours, 2),
                     PaymentStatus = "Unpaid",
                     Status = "Confirmed"
                 };
@@ -244,7 +247,7 @@ namespace Fitness_core_BE.Services
         /// requested window must have a free unit. Locks the facility row for the duration of the
         /// caller's transaction so two concurrent claims on the same facility serialize instead of
         /// both reading "room available" before either commits.</summary>
-        private async Task<(Facility facility, DateTime startTime, DateTime endTime, int? partySize)> ValidateAdhocRequestAsync(object payload)
+        private async Task<(Facility facility, DateTime startTime, DateTime endTime, int? partySize, decimal? pricePerHour)> ValidateAdhocRequestAsync(object payload)
         {
             var data = DeserializePayload.Deserialize(payload);
             var facilityId = Guid.Parse(data["facilityId"].GetString()!);
@@ -257,6 +260,14 @@ namespace Fitness_core_BE.Services
                 ? data["partySize"].GetInt32()
                 : null;
 
+            // Optional per-booking rate override -- the FE pre-fills this from the facility's
+            // own PricePerHour but lets staff adjust it (e.g. a discount) before charging.
+            decimal? pricePerHour = data.ContainsKey("pricePerHour") && data["pricePerHour"].ValueKind != JsonValueKind.Null
+                ? data["pricePerHour"].GetDecimal()
+                : null;
+            if (pricePerHour.HasValue && pricePerHour.Value < 0)
+                throw new ArgumentException("pricePerHour cannot be negative");
+
             var facility = await _facilityRepository.GetFacilityById(facilityId)
                 ?? throw new KeyNotFoundException("Facility not found");
             if (facility.BookingMode != "AdHoc")
@@ -269,7 +280,7 @@ namespace Fitness_core_BE.Services
             if (overlapping >= facility.NumberOfUnits)
                 throw new ArgumentException("No units are free for the requested time");
 
-            return (facility, startTime, endTime, partySize);
+            return (facility, startTime, endTime, partySize, pricePerHour);
         }
 
         // ---------- Payment / check-in / lifecycle ----------