Написана какая-то логика продажи в магазине

LawFirm/LawFirmFileImplement/Implements/ShopStorage.cs

@@ -11,27 +11,6 @@ using System.Threading.Tasks;
 
 namespace LawFirmFileImplement.Implements
 {
-
-
-    // Нужно узнать, проверять ли на наличие всех товаров, или только
-    // наличие определенного товара
-    // То же самое с продажей
-
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     public class ShopStorage : IShopStorage
     {
         private readonly DataFileSingleton source;
@@ -101,5 +80,90 @@ namespace LawFirmFileImplement.Implements
             return shop.GetViewModel;
         }
 
+        public bool SellDocument(DocumentSearchModel model, int count)
+        {
+            var document = source.Documents.FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id);
+
+            var countStore = count;
+
+            if (document == null)
+            {
+                return false;
+            }
+
+            foreach (var shop in source.Shops)
+            {
+                foreach (var doc in shop.ShopDocuments)
+                {
+                    if (doc.Value.Item1.Id == document.Id)
+                    {
+                        if (count > 0)
+                        {
+                            count = count - doc.Value.Item2;
+                        }
+                    }
+                    if (count < 1)
+                    {
+                        break;
+                    }
+                }
+            }
+
+            if (count > 0)
+            {
+                return false;
+            }
+
+            count = countStore;
+
+            for (int i = 0; i < source.Shops.Count; i++)
+            {
+                var shop = source.Shops[i];
+                var documents = shop.ShopDocuments;
+
+                for (int j = 0; j < documents.Count; j++)
+                {
+                    if (documents[j].Item1.Id == document.Id)
+                    {
+                        while (documents[j].Item2 > 0 || count > 0)
+                        {
+                            int tempItem2 = documents[j].Item2;
+                            tempItem2--;
+                            count--;
+                            documents[j] = (documents[j].Item1, tempItem2);
+                        }
+                    }
+
+                    if (count < 1)
+                    {
+                        shop.Update(new ShopBindingModel
+                        {
+                            Id = shop.Id,
+                            Name = shop.Name,
+                            Adress = shop.Adress,
+                            OpeningDate = shop.OpeningDate,
+                            MaxCountDocuments = shop.MaxCountDocuments,
+                            ShopDocuments= documents
+                        });
+                        break;
+                    }
+                }
+                shop.Update(new ShopBindingModel
+                {
+                    Id = shop.Id,
+                    Name = shop.Name,
+                    Adress = shop.Adress,
+                    OpeningDate = shop.OpeningDate,
+                    MaxCountDocuments = shop.MaxCountDocuments,
+                    ShopDocuments = documents
+                });
+            }
+
+            if (count > 0)
+            {
+                return false;
+            }
+            return true;
+        }
     }
 }