Refactor data layer, add business layer

BusinessLayer/Services/UserService.cs

@@ -0,0 +1,50 @@
+using DataAccessLayer;
+using DataAccessLayer.Entities;
+
+namespace BusinessLayer.Services
+{
+    public class UserService : IUserService
+    {
+        private readonly IUserAccountRepository _userAccountRepository;
+
+        public UserService(IUserAccountRepository userAccountRepository)
+        {
+            _userAccountRepository = userAccountRepository;
+        }
+
+        public IEnumerable<UserAccount> GetAll(int? limit, int? offset)
+        {
+            return _userAccountRepository.GetAll(limit, offset);
+        }
+
+        public UserAccount? GetById(Guid id)
+        {
+            return _userAccountRepository.GetById(id);
+        }
+
+        public UserAccount? GetByUsername(string username)
+        {
+            return _userAccountRepository.GetByUsername(username);
+        }
+
+        public UserAccount? GetByEmail(string email)
+        {
+            return _userAccountRepository.GetByEmail(email);
+        }
+
+        public void Add(UserAccount userAccount)
+        {
+            _userAccountRepository.Add(userAccount);
+        }
+
+        public void Update(UserAccount userAccount)
+        {
+            _userAccountRepository.Update(userAccount);
+        }
+
+        public void Delete(Guid id)
+        {
+            _userAccountRepository.Delete(id);
+        }
+    }
+}