Rework so employee dont use repos but servies

PointOfSale/Pos.Service/EmployeeService.cs

@@ -0,0 +1,54 @@
+using System;
+using System.Collections.Generic;
+using Database.Models;
+using Database.Repository;
+
+namespace Pos.Service
+{
+    public class EmployeeService
+    {
+        private readonly EmployeeRepository _employeeRepository =
+            new EmployeeRepository();
+
+        public List<EmployeeEntity> GetEmployees()
+        {
+            return _employeeRepository.GetAll();
+        }
+
+        public void AddEmployee(string name)
+        {
+            _employeeRepository.Add(ValidateName(name));
+            CacheService.Invalidate();
+        }
+
+        public void RenameEmployee(int employeeId, string name)
+        {
+            ValidateId(employeeId);
+            _employeeRepository.Edit(employeeId, ValidateName(name));
+            CacheService.Invalidate();
+        }
+
+        public void ArchiveEmployee(int employeeId)
+        {
+            ValidateId(employeeId);
+            _employeeRepository.Delete(employeeId);
+            CacheService.Invalidate();
+        }
+
+        private static string ValidateName(string name)
+        {
+            if (string.IsNullOrWhiteSpace(name))
+                throw new ArgumentException(
+                    "Medarbejderens navn skal være udfyldt.",
+                    nameof(name));
+
+            return name.Trim();
+        }
+
+        private static void ValidateId(int employeeId)
+        {
+            if (employeeId <= 0)
+                throw new ArgumentOutOfRangeException(nameof(employeeId));
+        }
+    }
+}