Переделан под LINQ метод SellDocument

LawFirm/LawFirmFileImplement/Implements/ShopStorage.cs

@@ -81,7 +81,7 @@ namespace LawFirmFileImplement.Implements
             return shop.GetViewModel;
         }
 
-        public bool SellDocument(IDocumentModel model, int count)
+/*        public bool SellDocument(IDocumentModel model, int count)
         {
             // переделать под linq 
 
@@ -151,5 +151,69 @@ namespace LawFirmFileImplement.Implements
             }
             return true;
         }
+*/
+        public bool SellDocument(IDocumentModel model, int count)
+        {
+            var document = source.Documents.FirstOrDefault(x => x.Id == model.Id);
+
+            if (document == null)
+            {
+                return false;
+            }
+
+            var countStore = count;
+
+            var shopDocuments = source.Shops.SelectMany(shop => shop.ShopDocuments.Where(doc => doc.Value.Item1.Id == document.Id));
+
+            foreach (var doc in shopDocuments)
+            {
+                count -= doc.Value.Item2;
+
+                if (count <= 0)
+                {
+                    break;
+                }
+            }
+
+            if (count > 0)
+            {
+                return false;
+            }
+
+            count = countStore;
+
+            foreach (var shop in source.Shops)
+            {
+                var documents = shop.ShopDocuments;
+
+                foreach (var doc in documents.Where(x => x.Value.Item1.Id == document.Id))
+                {
+                    var min = Math.Min(doc.Value.Item2, count);
+                    documents[doc.Value.Item1.Id] = (doc.Value.Item1, doc.Value.Item2 - min);
+                    count -= min;
+
+                    if (count <= 0)
+                    {
+                        break;
+                    }
+                }
+
+                shop.Update(new ShopBindingModel
+                {
+                    Id = shop.Id,
+                    Name = shop.Name,
+                    Adress = shop.Adress,
+                    OpeningDate = shop.OpeningDate,
+                    MaxCountDocuments = shop.MaxCountDocuments,
+                    ShopDocuments = documents
+                });
+
+                source.SaveShops();
+
+                if (count <= 0) break;
+            }
+
+            return count <= 0;
+        }
     }
 }