fix

UniversityBusinessLogic/BusinessLogics/UserLogic.cs

@@ -13,6 +13,85 @@ namespace UniversityBusinessLogic.BusinessLogics
 {
     public class UserLogic : IUserLogic
     {
+        private readonly IUserStorage _userStorage;
 
+        public UserLogic(IUserStorage userStorage)
+        {
+            _userStorage = userStorage;
+        }
+        public bool Create(UserBindingModel model)
+        {
+            CheckModel(model);
+            if (_userStorage.Insert(model) == null)
+            {
+                return false;
+            }
+            return true;
+        }
+
+        public bool Delete(UserBindingModel model)
+        {
+            CheckModel(model, false);
+            if (_userStorage.Delete(model) == null)
+            {
+                return false;
+            }
+            return true;
+        }
+
+        public UserViewModel? ReadElement(UserSearchModel model)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            var user = _userStorage.GetElement(model);
+            if (user == null)
+            {
+                return null;
+            }
+            return user;
+        }
+
+        public List<UserViewModel>? ReadList(UserSearchModel? model)
+        {
+            var list = model == null ? _userStorage.GetFullList() : _userStorage.GetFilteredList(model);
+            if (list == null)
+            {
+                return null;
+            }
+            return list;
+        }
+
+        public bool Update(UserBindingModel model)
+        {
+            CheckModel(model, false);
+            if (_userStorage.Update(model) == null)
+            {
+                return false;
+            }
+            return true;
+        }
+        private void CheckModel(UserBindingModel model, bool withParams = true)
+        {
+            if (model == null)
+            {
+                throw new ArgumentNullException(nameof(model));
+            }
+            if (!withParams)
+            {
+                return;
+            }
+            if (string.IsNullOrEmpty(model.Login))
+            {
+                throw new ArgumentNullException("Нет логина", nameof(model.Login));
+            }
+
+            var user = _userStorage.GetElement(new UserSearchModel{Login = model.Login});
+            if (user != null)
+            {
+                throw new InvalidOperationException("Пользователь с таким логином уже есть");
+            }
+        }
     }
 }