CourseWorkElectronicsShop/ElectronicsShop/ElectronicsShopDataBaseImplement/Implements/CostItemStorage.cs

using ElectronicsShopContracts.BindingModels;
using ElectronicsShopContracts.SearchModels;
using ElectronicsShopContracts.StorageContracts;
using ElectronicsShopContracts.ViewModels;
using ElectronicsShopDataBaseImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ElectronicsShopDataBaseImplement.Implements
{
    public class CostItemStorage : ICostItemStorage
    {
		public CostItemViewModel? Insert(CostItemBindingModel model) {
			var newComponent = CostItem.Create(model);
			if (newComponent == null) {
				return null;
			}
			using var context = new Database();
			context.CostItems.Add(newComponent);
			context.SaveChanges();
			return newComponent.GetViewModel;
		}

		public CostItemViewModel? Update(CostItemBindingModel model) {
			using var context = new Database();
			var component = context.CostItems.FirstOrDefault(x => x.ID == model.ID);
			if (component == null) {
				return null;
			}
			component.Update(model);
			context.SaveChanges();
			return component.GetViewModel;
		}

		public CostItemViewModel? Delete(CostItemBindingModel model)
        {
            using var context = new Database();
            var element = context.CostItems.FirstOrDefault(rec => rec.ID == model.ID);
            if (element != null)
            {
                context.CostItems.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }

        public CostItemViewModel? GetElement(CostItemSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Name) && !model.ID.HasValue)
            {
                return null;
            }
            using var context = new Database();
            return context.CostItems
                .FirstOrDefault(x => (!string.IsNullOrEmpty(model.Name) 
                                && x.Name == model.Name) ||
                                (model.ID.HasValue && x.ID == model.ID))?.GetViewModel;
        }

        public List<CostItemViewModel> GetFillteredList(CostItemSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Name))
            {
                return new();
            }
            using var context = new Database();
            return context.CostItems.Where(x => x.Name.Contains(model.Name))
                                    .Select(x => x.GetViewModel).ToList();
        }

        public List<CostItemViewModel> GetFullList()
        {
            using var context = new Database();
            return context.CostItems.Select(x => x.GetViewModel).ToList();
        }
    }
}