ISEbd-21_Koscheev.M.S.SoftwareInstallation/SoftwareInstallation/SoftWareInstallationDatabaseImplement/OrderStorage.cs

using SoftwareInstallationContracts.BindingModels;
using SoftwareInstallationContracts.SearchModels;
using SoftwareInstallationContracts.StoragesContracts;
using SoftwareInstallationContracts.ViewModels;
using SoftwareInstallationDatabaseImplement.Models;

namespace SoftwareInstallationDatabaseImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        public OrderViewModel? Delete(OrderBindingModel model)
        {
            using var context = new SoftwareInstallationDatabase();
            var element = context.Orders.FirstOrDefault(x => x.Id == model.Id);
            if (element != null)
            {
                context.Orders.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }

        public OrderViewModel? GetElement(OrderSearchModel model)
        {
            using var context = new SoftwareInstallationDatabase();
            if (!model.Id.HasValue)
            {
                return null;
            }
            return context.Orders.FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id)?.GetViewModel;
        }

        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
            var result = GetElement(model);
            return result != null ? new() { result } : new();
        }

        public List<OrderViewModel> GetFullList()
        {
            using var context = new SoftwareInstallationDatabase();
            return context.Orders
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public OrderViewModel? Insert(OrderBindingModel model)
        {
            var newOrder = Order.Create(model);
            if (newOrder == null)
            {
                return null;
            }
            using var context = new SoftwareInstallationDatabase();
            context.Orders.Add(newOrder);
            context.SaveChanges();
            return newOrder.GetViewModel;
        }

        public OrderViewModel? Update(OrderBindingModel model)
        {
            using var context = new SoftwareInstallationDatabase();
            var order = context.Orders.FirstOrDefault(x => x.Id == model.Id);
            if (order == null)
            {
                return null;
            }
            order.Update(model);
            context.SaveChanges();
            return order.GetViewModel;
        }
    }
}