PIbd-33_Dyakonov_R_R_COP_14/DatabaseImplement/Implements/ManufacturerStorage.cs

using Contracts.BindingModels;
using Contracts.StorageContracts;
using Contracts.ViewModels;
using DatabaseImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net.NetworkInformation;
using System.Text;
using System.Threading.Tasks;

namespace DatabaseImplement.Implements
{
	public class ManufacturerStorage : IManufacturerStorage
	{
		public void Delete(ManufacturerBindingModel model)
		{
			var context = new ProductsDatabase();
			var Manufacturer = context.Manufacturers.FirstOrDefault(rec => rec.Id == model.Id);
			if (Manufacturer != null)
			{
				context.Manufacturers.Remove(Manufacturer);
				context.SaveChanges();
			}
			else
			{
				throw new Exception("Производитель не найден");
			}
		}

		public ManufacturerViewModel GetElement(ManufacturerBindingModel model)
		{
			if (model == null)
			{
				return null;
			}
			using var context = new ProductsDatabase();

			var manufacturer = context.Manufacturers
					.ToList()
					.FirstOrDefault(rec => rec.Id == model.Id || rec.Name == model.Name);
			return manufacturer != null ? CreateModel(manufacturer) : null;
		}


		public List<ManufacturerViewModel> GetFilteredList(ManufacturerBindingModel model)
		{
			if (model == null)
			{
				return null;
			}
			using var context = new ProductsDatabase();
			return context.Manufacturers
				.Where(rec => rec.Name.Contains(model.Name))
				.Select(CreateModel)
				.ToList();
		}

		public List<ManufacturerViewModel> GetFullList()
		{
			using var context = new ProductsDatabase();
			return context.Manufacturers
				.Select(CreateModel)
				.ToList();
		}

		public void Insert(ManufacturerBindingModel model)
		{
			var context = new ProductsDatabase();
			var transaction = context.Database.BeginTransaction();
			try
			{
				context.Manufacturers.Add(CreateModel(model, new Manufacturer()));
				context.SaveChanges();
				transaction.Commit();
			}
			catch
			{
				transaction.Rollback();
				throw;
			}
		}

		public void Update(ManufacturerBindingModel model)
		{
			var context = new ProductsDatabase();
			var transaction = context.Database.BeginTransaction();
			try
			{
				var Manufacturer = context.Manufacturers.FirstOrDefault(rec => rec.Id == model.Id);
				if (Manufacturer == null)
				{
					throw new Exception("Производитель не найден");
				}
				CreateModel(model, Manufacturer);
				context.SaveChanges();
				transaction.Commit();
			}
			catch
			{
				transaction.Rollback();
				throw;
			}
		}

		private static Manufacturer CreateModel(ManufacturerBindingModel model, Manufacturer Manufacturer)
		{
			Manufacturer.Name = model.Name;
			return Manufacturer;
		}

		private static ManufacturerViewModel CreateModel(Manufacturer Manufacturer)
		{
			return new ManufacturerViewModel
			{
				Id = Manufacturer.Id,
				Name = Manufacturer.Name
			};
		}
	}
}