ComputerHardwareStore_YouAreProgrammer/ComputerHardwareStore/ComputerHardwareStoreDatabaseImplement/Implements/ComponentStorage.cs

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

namespace ComputerHardwareStoreDatabaseImplement.Implements
{
    public class ComponentStorage : IComponentStorage
    {
        public List<ComponentViewModel> GetFullList()
        {
            using var context = new ComputerHardwareStoreDBContext();
            return context.Components
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public List<ComponentViewModel> GetFilteredList(ComponentSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Name))
            {
                return new ();
            }
            using var context = new ComputerHardwareStoreDBContext();
            return context.Components
                .Where(x => x.Name.Contains(model.Name))
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public ComponentViewModel? GetElement(ComponentSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Name) && !model.Id.HasValue)
            {
                return null;
            }
            using var context = new ComputerHardwareStoreDBContext();
            return context.Components
                .FirstOrDefault(x =>
                (!string.IsNullOrEmpty(model.Name)
                && x.Name == model.Name)
                || (model.Id.HasValue && x.Id == model.Id))
                ?.GetViewModel;
        }

        public ComponentViewModel? Insert(ComponentBindingModel model)
        {
            using var context = new ComputerHardwareStoreDBContext();
            var newComponent = Component.Create(context, model);
            if (newComponent == null)
            {
                return null;
            }
            context.Components.Add(newComponent);
            context.SaveChanges();
            return newComponent.GetViewModel;
        }
        public ComponentViewModel? Update(ComponentBindingModel model)
        {
            using var context = new ComputerHardwareStoreDBContext();
            var component = context.Components.FirstOrDefault(x => x.Id == model.Id);
            if (component == null)
            {
                return null;
            }
            component.Update(model);
            context.SaveChanges();
            return component.GetViewModel;
        }

        public ComponentViewModel? Delete(ComponentBindingModel model)
        {
            using var context = new ComputerHardwareStoreDBContext();
            var element = context.Components.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Components.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}