еще правки

SoftwareInstallation/SoftwareInstallationFileImplement/ShopStorage.cs

@@ -6,6 +6,7 @@ using SoftwareInstallationDataModels.Models;
 using System;
 using System.Collections.Generic;
 using System.Linq;
+using System.Numerics;
 using System.Text;
 using System.Threading.Tasks;
 
@@ -73,29 +74,48 @@ namespace SoftwareInstallationFileImplement
 
         public bool SellPackage(IPackageModel model, int quantity)
         {
-            if (source.Shops.Select(x => x.ShopPackages.FirstOrDefault(y => y.Key == model.Id).Value.Item2).Sum() < quantity)
+
+            var package = source.Shops.FirstOrDefault(x => x.Id == model.Id);
+            if (package == null || !CheckCount(model, quantity))
             {
                 return false;
             }
-            foreach (var Shop in source.Shops.Where(x => x.ShopPackages.ContainsKey(model.Id)))
+            foreach (var shop in source.Shops)
             {
-                int QuantityInCurrentShop = Shop.ShopPackages[model.Id].Item2;
+                var packages = shop.ShopPackages;
-                if (QuantityInCurrentShop <= quantity)
+                foreach (var elem in packages.Where(x => x.Value.Item1.Id == package.Id))
                 {
-                    Shop.ShopPackages.Remove(model.Id);
+                    var selling = Math.Min(elem.Value.Item2, quantity);
-                    quantity -= QuantityInCurrentShop;
+                    packages[elem.Value.Item1.Id] = (elem.Value.Item1, elem.Value.Item2 - selling);
+                    quantity -= selling;
+
+                    if (quantity <= 0)
+                    {
+                        break;
                     }
-                else
-                {
-                    Shop.ShopPackages[model.Id] = (Shop.ShopPackages[model.Id].Item1, QuantityInCurrentShop - quantity);
-                    quantity = 0;
                 }
-                if (quantity == 0)
+
+                shop.Update(new ShopBindingModel
                 {
+                    Id = model.Id,
+                    Name = shop.Name,
+                    Address = shop.Address,
+                    DateOpening = shop.DateOpening,
+                    ShopPackages = packages,
+                    PackageMaxCount = shop.PackageMaxCount
+                });
+            }
+            source.SaveShops();
             return true;
+            
         }
-            }
+        public bool CheckCount(IPackageModel model, int quantity)
-            return false;
+        {
+            int store = source.Shops
+                .Select(x => x.ShopPackages
+                    .Select(y => (y.Value.Item1.Id == model.Id ? y.Value.Item2 : 0))
+                .Sum()).Sum();
+            return store >= quantity;
         }
 
         public ShopViewModel? Update(ShopBindingModel model)