ComputerHardwareStore_YouAreProgrammer/ComputerHardwareStore/ComputerHardwareStoreDatabaseImplement/Implements/Vendor.cs

using ComputerHardwareStoreContracts.BindingModels;
using ComputerHardwareStoreContracts.SearchModels;
using ComputerHardwareStoreContracts.StorageContracts;
using ComputerHardwareStoreContracts.ViewModels;
using ComputerHardwareStoreDatabaseImplement.Models;

namespace ComputerHardwareStoreDatabaseImplement.Implements
{
    public class VendorStorage : IVendorStorage
    {
        public VendorViewModel? GetElement(VendorSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Login) && !model.Id.HasValue)
            {
                return null;
            }
            using var context = new ComputerHardwareStoreDBContext();
            return context.Vendors
                .FirstOrDefault(x => (!string.IsNullOrEmpty(model.Login)
                && x.Login == model.Login)
                || (model.Id.HasValue && x.Id == model.Id))
                ?.GetViewModel;
        }

        public List<VendorViewModel> GetFilteredList(VendorSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Login))
            {
                return new();
            }
            using var context = new ComputerHardwareStoreDBContext();
            return context.Vendors
                .Where(x => x.Login.Contains(model.Login))
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public List<VendorViewModel> GetFullList()
        {
            using var context = new ComputerHardwareStoreDBContext();
            return context.Vendors
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public VendorViewModel? Insert(VendorBindingModel model)
        {
            using var context = new ComputerHardwareStoreDBContext();
            var newVendor = Vendor.Create(context, model);
            if (newVendor == null)
            {
                return null;
            }
            context.Vendors.Add(newVendor);
            context.SaveChanges();
            return newVendor.GetViewModel;
        }

        public VendorViewModel? Update(VendorBindingModel model)
        {
            using var context = new ComputerHardwareStoreDBContext();
            var element = context.Vendors.FirstOrDefault(x => x.Id == model.Id);
            if (element == null)
            {
                return null;
            }
            element.Update(model);
            context.SaveChanges();
            return element.GetViewModel;
        }
        public VendorViewModel? Delete(VendorBindingModel model)
        {
            using var context = new ComputerHardwareStoreDBContext();
            var element = context.Vendors.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Vendors.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}