Add invoice print and finalize flow

Distribution/Features/DeliveryRide/DeliveryTaskService.cs

@@ -1,3 +1,4 @@
+using Distribution.Features.LoadingEvent;
 using Distribution.Features.Ride;
 using Distribution.Features.ShopPO;
 using Distribution.Features.Stock;
@@ -10,6 +11,7 @@ public class DeliveryTaskService(
     IDeliveryTaskRepository repo,
     IRideRepository rideRepo,
     IShopPORepository shopPORepo,
+    ILoadingSheetRepository loadingSheetRepo,
     IStockRepository stockRepo,
     IUnitOfWork uow)
 {
@@ -32,8 +34,52 @@ public class DeliveryTaskService(
                 i.UnitPrice)).ToList(),
             t.CreatedAt);
 
-    public Task<List<DeliveryTaskResponse>> GenerateAsync(Guid rideId, CancellationToken ct = default) =>
-        throw new NotImplementedException("Delivery task auto-generation is deferred — route-based dispatch not yet implemented.");
+    public async Task<List<DeliveryTaskResponse>> GenerateAsync(Guid rideId, CancellationToken ct = default)
+    {
+        var ride = await rideRepo.GetByIdAsync(rideId)
+            ?? throw new KeyNotFoundException("Ride not found");
+
+        var confirmedSheets = await loadingSheetRepo.GetAllAsync(rideId, LoadingSheetStatus.Confirmed, null, null, 1, int.MaxValue);
+        if (confirmedSheets.Count == 0)
+            throw new InvalidOperationException("Ride has no confirmed loading sheet to generate delivery tasks from");
+
+        var shopPOIds = confirmedSheets
+            .SelectMany(s => s.Orders)
+            .Select(o => o.FK_ShopPOId)
+            .Distinct()
+            .ToList();
+
+        var existingTasks = await repo.GetByRideIdAsync(rideId);
+        var nextSequence = existingTasks.Count > 0 ? existingTasks.Max(t => t.Sequence) + 1 : 1;
+
+        var newTasks = new List<DeliveryTask>();
+        foreach (var shopPOId in shopPOIds)
+        {
+            if (await repo.ExistsForOrderAndRideAsync(shopPOId, rideId)) continue;
+
+            newTasks.Add(new DeliveryTask
+            {
+                FK_RideId = rideId,
+                FK_ShopPOId = shopPOId,
+                Sequence = nextSequence++,
+                Status = DeliveryTaskStatus.Pending
+            });
+        }
+
+        if (newTasks.Count > 0)
+        {
+            await uow.BeginAsync(ct);
+            try
+            {
+                foreach (var task in newTasks) await repo.AddAsync(task);
+                await uow.CommitAsync(ct);
+            }
+            catch { await uow.RollbackAsync(ct); throw; }
+        }
+
+        var saved = await repo.GetByRideIdAsync(rideId);
+        return saved.Select(ToResponse).ToList();
+    }
 
     public async Task<List<DeliveryTaskResponse>> GetByRideIdAsync(Guid rideId)
     {