Zhelovanov_Dmitrii_COP/DatabaseImplement/Implements/BookStorage.cs

using Contracts.BindingModels;
using Contracts.SearchModels;
using Contracts.StoragesContracts;
using Contracts.ViewModels;
using DatabaseImplement.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DatabaseImplement.Implements
{
	public class BookStorage : IBookStorage
	{
		public BookViewModel? Delete(BookBindingModel model)
		{
			using var context = new COPcontext();
			var element = context.Books.FirstOrDefault(rec => rec.Id ==
		   model.Id);
			if (element != null)
			{
				context.Books.Remove(element);
				context.SaveChanges();
				return element.GetViewModel;
			}
			return null;
		}

		public BookViewModel? GetElement(BookSearchModel model)
		{
			if (string.IsNullOrEmpty(model.Name) && !model.Id.HasValue)
			{
				return null;
			}
			using var context = new COPcontext();
			return context.Books
			.FirstOrDefault(x =>
		   (!string.IsNullOrEmpty(model.Name) && x.Name ==
		   model.Name) ||
			(model.Id.HasValue && x.Id == model.Id))
			?.GetViewModel;
		}

		public List<BookViewModel> GetFilteredList(BookSearchModel model)
		{
			if (string.IsNullOrEmpty(model.Name))
			{
				return new();
			}
			using var context = new COPcontext();
			return context.Books
			.Where(x => x.Name.Contains(model.Name))
		   .Select(x => x.GetViewModel)
		   .ToList();
		}

		public List<BookViewModel> GetFullList()
		{
			using var context = new COPcontext();
			return context.Books
			.Select(x => x.GetViewModel)
		   .ToList();
		}

		public BookViewModel? Insert(BookBindingModel model)
		{
			var newComponent = Book.Create(model);
			if (newComponent == null)
			{
				return null;
			}
			using var context = new COPcontext();
			context.Books.Add(newComponent);
			context.SaveChanges();
			return newComponent.GetViewModel;
		}

		public BookViewModel? Update(BookBindingModel model)
		{
			using var context = new COPcontext();
			var component = context.Books.FirstOrDefault(x => x.Id ==
		   model.Id);
			if (component == null)
			{
				return null;
			}
			component.Update(model);
			context.SaveChanges();
			return component.GetViewModel;
		}
	}
}