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ComputerShopListImplement/Implements/OrderStorage.cs

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+using ComputerShopContracts.BindingModels;
+using ComputerShopContracts.SearchModels;
+using ComputerShopContracts.StoragesContracts;
+using ComputerShopContracts.ViewModels;
+using ComputerShopListImplement.Models;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ComputerShopListImplement.Implements
+{
+    public class OrderStorage : IOrderStorage
+    {
+        private readonly DataListSingleton _source;
+
+        public OrderStorage()
+        {
+            _source = DataListSingleton.GetInstance();
+        }
+
+        public OrderViewModel? GetElement(OrderSearchModel model)
+        {
+            if (!model.Id.HasValue)
+            {
+                return null;
+            }
+            foreach (var order in _source.Orders)
+            {
+                if (model.Id.HasValue && order.Id == model.Id)
+                {
+                    return order.GetViewModel;
+                }
+            }
+            return null;
+        }
+
+        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
+        {
+            var result = new List<OrderViewModel>();
+            if (!model.Id.HasValue)
+            {
+                return result;
+            }
+            foreach (var order in _source.Orders)
+            {
+                if (order.Id == model.Id)
+                {
+                    result.Add(order.GetViewModel);
+                }
+            }
+            return result;
+        }
+
+        public List<OrderViewModel> GetFullList()
+        {
+            var result = new List<OrderViewModel>();
+            foreach (var order in _source.Orders)
+            {
+                result.Add(order.GetViewModel);
+            }
+            return result;
+        }
+
+        public OrderViewModel? Insert(OrderBindingModel model)
+        {
+            model.Id = 1;
+            foreach (var order in _source.Orders)
+            {
+                if (model.Id <= order.Id)
+                {
+                    model.Id = order.Id + 1;
+                }
+            }
+            var newOrder = Order.Create(model);
+            if (newOrder == null)
+            {
+                return null;
+            }
+            _source.Orders.Add(newOrder);
+            return newOrder.GetViewModel;
+        }
+
+        public OrderViewModel? Update(OrderBindingModel model)
+        {
+            foreach (var order in _source.Orders)
+            {
+                if (order.Id == model.Id)
+                {
+                    order.Update(model);
+                    return order.GetViewModel;
+                }
+            }
+            return null;
+        }
+        public OrderViewModel? Delete(OrderBindingModel model)
+        {
+            for (int i = 0; i < _source.Orders.Count; ++i)
+            {
+                if (_source.Orders[i].Id == model.Id)
+                {
+                    var element = _source.Orders[i];
+                    _source.Orders.RemoveAt(i);
+                    return element.GetViewModel;
+                }
+            }
+            return null;
+        }
+    }
+}