SUBD/TravelCompany/TravelCompanyDatabaseImplement/Implements/OrderStorage.cs

using TravelCompanyContracts.BindingModels;
using TravelCompanyContracts.SearchModels;
using TravelCompanyContracts.StoragesContracts;
using TravelCompanyContracts.ViewModels;
using TravelCompanyDatabaseImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;

namespace TravelCompanyDatabaseImplement.Implements
{
    public class OrderStorage : IOrderStorage
    {
        public OrderViewModel? GetElement(OrderSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }

            using var context = new TravelCompanyDataBase();

            return context.Orders.Include(x => x.Travel).
                FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id)
                ?.GetViewModel;
        }

        public List<OrderViewModel> GetFilteredList(OrderSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return new();
            }

            using var context = new TravelCompanyDataBase();

            return context.Orders
                .Include(x => x.Travel)
                .Where(x => x.Id == model.Id)
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public List<OrderViewModel> GetFullList()
        {
            using var context = new TravelCompanyDataBase();

            return context.Orders.Include(x => x.Travel)
                .Select(x => x.GetViewModel).ToList();
        }

        public OrderViewModel? Insert(OrderBindingModel model)
        {
            var newOrder = Order.Create(model);

            if (newOrder == null)
            {
                return null;
            }

            using var context = new TravelCompanyDataBase();
            context.Orders.Add(newOrder);
            context.SaveChanges();

            return context.Orders.Include(x => x.Travel)
                .FirstOrDefault(x => x.Id == newOrder.Id)?.GetViewModel;
        }

        public OrderViewModel? Update(OrderBindingModel model)
        {
            using var context = new TravelCompanyDataBase();
            var order = context.Orders.FirstOrDefault(x => x.Id == model.Id);

            if (order == null)
            {
                return null;
            }

            order.Update(model);
            context.SaveChanges();

            return context.Orders.Include(x => x.Travel).FirstOrDefault(x => x.Id == model.Id)?.GetViewModel;
        }

        public OrderViewModel? Delete(OrderBindingModel model)
        {
            using var context = new TravelCompanyDataBase();
            var element = context.Orders.FirstOrDefault(rec => rec.Id == model.Id);

            if (element != null)
            {
                context.Orders.Remove(element);
                context.SaveChanges();

                return element.GetViewModel;
            }

            return null;
        }
    }
}