Add FlatPaymentController with RESTful payment endpoints

Introduced FlatPaymentController under Distribution.Features.Payment, providing GET and POST endpoints at /api/payments. Supports listing, retrieving, and creating payments with filtering and error handling. Business logic is delegated to PaymentService.

Distribution/Features/LoadingEvent/LoadingSheetController.cs

@@ -100,4 +100,43 @@ public class LoadingSheetController(LoadingSheetService service, ICurrentUserSer
         catch (KeyNotFoundException) { return NotFound(); }
         catch (InvalidOperationException ex) { return BadRequest(new { error = ex.Message }); }
     }
+
+    [HttpPatch("{id:guid}/dispatch")]
+    public async Task<IActionResult> PatchDispatch(Guid id, CancellationToken ct)
+    {
+        var userId = currentUser.UserId ?? throw new UnauthorizedAccessException();
+        try
+        {
+            var result = await service.ConfirmDispatchAsync(id, userId, ct);
+            return Ok(result);
+        }
+        catch (KeyNotFoundException) { return NotFound(); }
+        catch (InvalidOperationException ex) { return BadRequest(new { error = ex.Message }); }
+    }
+
+    [HttpPatch("{id:guid}/receipt")]
+    public async Task<IActionResult> PatchReceipt(Guid id, PatchReceiptRequest request, CancellationToken ct)
+    {
+        var userId = currentUser.UserId ?? throw new UnauthorizedAccessException();
+        try
+        {
+            var result = await service.PatchReceiptAsync(id, request.Items, userId, ct);
+            return Ok(result);
+        }
+        catch (KeyNotFoundException) { return NotFound(); }
+        catch (InvalidOperationException ex) { return BadRequest(new { error = ex.Message }); }
+    }
+
+    [HttpPatch("{id:guid}/resolve")]
+    public async Task<IActionResult> PatchResolve(Guid id, CancellationToken ct)
+    {
+        var userId = currentUser.UserId ?? throw new UnauthorizedAccessException();
+        try
+        {
+            var result = await service.PatchResolveAsync(id, userId, ct);
+            return Ok(result);
+        }
+        catch (KeyNotFoundException) { return NotFound(); }
+        catch (InvalidOperationException ex) { return BadRequest(new { error = ex.Message }); }
+    }
 }

Distribution/Features/LoadingEvent/LoadingSheetDTOs.cs

@@ -35,3 +35,7 @@ public record ConfirmReceiptRequest(int Meterstart);
 
 public record ResolveDiscrepancyRequest(List<ResolveItemInput> Items, int Meterstart);
 public record ResolveItemInput(Guid FK_ItemId, decimal QuantityResolved);
+
+// Combined PATCH endpoints used by the frontend
+public record PatchReceiptItemInput(Guid ItemId, decimal QuantityReceived);
+public record PatchReceiptRequest(List<PatchReceiptItemInput> Items);

Distribution/Features/LoadingEvent/LoadingSheetService.cs

@@ -225,6 +225,98 @@ public class LoadingSheetService(
         return ToResponse(sheet);
     }
 
+    public async Task<LoadingSheetResponse> PatchReceiptAsync(Guid id, List<PatchReceiptItemInput> items, Guid userId, CancellationToken ct = default)
+    {
+        var sheet = await repo.GetByIdAsync(id)
+            ?? throw new KeyNotFoundException("Loading sheet not found");
+
+        if (sheet.Status != LoadingSheetStatus.DispatchConfirmed)
+            throw new InvalidOperationException($"Cannot set receipt for a sheet in {sheet.Status} status");
+
+        foreach (var input in items)
+        {
+            var sheetItem = sheet.Items.FirstOrDefault(i => i.FK_ItemId == input.ItemId)
+                ?? throw new InvalidOperationException($"Item {input.ItemId} is not on this loading sheet");
+            sheetItem.QuantityReceived = input.QuantityReceived;
+        }
+
+        var ride = await rideRepo.GetByIdAsync(sheet.FK_RideId)
+            ?? throw new KeyNotFoundException("Ride not found");
+
+        var hasDiscrepancy = sheet.Items.Any(i => i.QuantityReceived != i.QuantityDispatched);
+
+        await uow.BeginAsync(ct);
+        try
+        {
+            if (hasDiscrepancy)
+            {
+                sheet.Status = LoadingSheetStatus.DiscrepancyFlagged;
+            }
+            else
+            {
+                sheet.Status = LoadingSheetStatus.ReceiptConfirmed;
+                sheet.ReceiptConfirmedAt = DateTime.Now;
+                sheet.ReceiptConfirmedBy = userId;
+
+                var lines = sheet.Items.Select(i => (i.FK_ItemId, i.QuantityReceived!.Value)).ToList();
+                await ApplyLoadMovementsAsync(sheet, ride.FK_VehicleId, lines, userId);
+
+                ride.Status = RideStatus.Active;
+                ride.ActivatedAt = DateTime.Now;
+                ride.Meterstart = 0;
+                rideRepo.Update(ride);
+            }
+
+            repo.Update(sheet);
+            await uow.CommitAsync(ct);
+        }
+        catch { await uow.RollbackAsync(ct); throw; }
+
+        return ToResponse(sheet);
+    }
+
+    public async Task<LoadingSheetResponse> PatchResolveAsync(Guid id, Guid userId, CancellationToken ct = default)
+    {
+        var sheet = await repo.GetByIdAsync(id)
+            ?? throw new KeyNotFoundException("Loading sheet not found");
+
+        if (sheet.Status != LoadingSheetStatus.DiscrepancyFlagged)
+            throw new InvalidOperationException($"Cannot resolve a sheet in {sheet.Status} status");
+
+        foreach (var item in sheet.Items)
+        {
+            if (!item.QuantityReceived.HasValue)
+                throw new InvalidOperationException($"Item {item.FK_ItemId} has no received quantity to resolve from");
+            item.QuantityResolved = item.QuantityReceived.Value;
+        }
+
+        var ride = await rideRepo.GetByIdAsync(sheet.FK_RideId)
+            ?? throw new KeyNotFoundException("Ride not found");
+
+        sheet.Status = LoadingSheetStatus.Resolved;
+        sheet.ReceiptConfirmedAt = DateTime.Now;
+        sheet.ReceiptConfirmedBy = userId;
+
+        var lines = sheet.Items.Select(i => (i.FK_ItemId, i.QuantityResolved!.Value)).ToList();
+
+        await uow.BeginAsync(ct);
+        try
+        {
+            await ApplyLoadMovementsAsync(sheet, ride.FK_VehicleId, lines, userId);
+
+            ride.Status = RideStatus.Active;
+            ride.ActivatedAt = DateTime.Now;
+            ride.Meterstart = 0;
+            rideRepo.Update(ride);
+
+            repo.Update(sheet);
+            await uow.CommitAsync(ct);
+        }
+        catch { await uow.RollbackAsync(ct); throw; }
+
+        return ToResponse(sheet);
+    }
+
     private async Task ApplyLoadMovementsAsync(LoadingSheet sheet, Guid vehicleId, List<(Guid ItemId, decimal Qty)> lines, Guid userId)
     {
         foreach (var (itemId, qty) in lines.Where(l => l.Qty > 0))