Rework so employee dont use repos but servies

PointOfSale/Pos.Service/ProductGroupService.cs

@@ -0,0 +1,85 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using Database.Models;
+using Database.Repository;
+
+namespace Pos.Service
+{
+    public class ProductGroupService
+    {
+        private readonly ProductGroupRepository _productGroupRepository =
+            new ProductGroupRepository();
+
+        public List<ProductGroupEntity> GetProductGroups()
+        {
+            return _productGroupRepository.GetAll();
+        }
+
+        public bool HasProductGroups()
+        {
+            return _productGroupRepository.Any();
+        }
+
+        public void AddProductGroup(string name)
+        {
+            _productGroupRepository.Add(ValidateName(name));
+            CacheService.Invalidate();
+        }
+
+        public void RenameProductGroup(int productGroupId, string name)
+        {
+            ValidateId(productGroupId);
+            _productGroupRepository.Edit(
+                ValidateName(name),
+                productGroupId);
+            CacheService.Invalidate();
+        }
+
+        public void ArchiveProductGroup(int productGroupId)
+        {
+            ValidateId(productGroupId);
+            _productGroupRepository.Archive(productGroupId);
+            CacheService.Invalidate();
+        }
+
+        public void UpdateOrder(IReadOnlyList<int> orderedProductGroupIds)
+        {
+            ValidateOrder(orderedProductGroupIds);
+            _productGroupRepository.SetOrder(orderedProductGroupIds);
+            CacheService.Invalidate();
+        }
+
+        private static string ValidateName(string name)
+        {
+            if (string.IsNullOrWhiteSpace(name))
+                throw new ArgumentException(
+                    "Produktgruppen skal have et navn.",
+                    nameof(name));
+
+            return name.Trim();
+        }
+
+        private static void ValidateId(int productGroupId)
+        {
+            if (productGroupId <= 0)
+                throw new ArgumentOutOfRangeException(nameof(productGroupId));
+        }
+
+        private static void ValidateOrder(IReadOnlyList<int> orderedIds)
+        {
+            if (orderedIds == null)
+                throw new ArgumentNullException(nameof(orderedIds));
+
+            if (orderedIds.Any(id => id <= 0))
+                throw new ArgumentException(
+                    "Rækkefølgen indeholder et ugyldigt id.",
+                    nameof(orderedIds));
+
+            if (orderedIds.Distinct().Count() != orderedIds.Count)
+                throw new ArgumentException(
+                    "Rækkefølgen indeholder dubletter.",
+                    nameof(orderedIds));
+        }
+    }
+}