ISEbd-21.Fedotov.I.A.Diner/Diner/DinerDataBaseImplement/Implements/FoodStorage.cs

 using DinerContracts.BindingModels;
using DinerContracts.SearchModels;
using DinerContracts.StoragesContracts;
using DinerContracts.ViewModels;
using DinerDataBaseImplement.Models;
using System;
using System.Collections.Generic;
using System.ComponentModel.DataAnnotations;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DinerDataBaseImplement.Implements
{
    public class FoodStorage : IFoodStorage
    {
        public FoodViewModel? Delete(FoodBindingModel model)
        {
            using var context = new DinerDatabaseBy7Work();
            var element = context.Components.FirstOrDefault(x => x.ID == model.ID);
            if (element != null)
            {
                context.Components.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }

        public FoodViewModel? GetElement(FoodSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ComponentName) && !model.ID.HasValue) { 
                return null; 
            }
            using var context = new DinerDatabaseBy7Work();
            return context.Components
                .FirstOrDefault(x => (!string.IsNullOrEmpty(model.ComponentName) &&
                                x.ComponentName == model.ComponentName) || model.ID.HasValue &&
                                x.ID == model.ID)?.GetViewModel;
        }

        public List<FoodViewModel> GetFilteredList(FoodSearchModel model)
        {
            if (string.IsNullOrEmpty(model.ComponentName)) { 
                return new(); 
            
            }
            using var context = new DinerDatabaseBy7Work();
            return context.Components.Where(x => x.ComponentName.Contains(model.ComponentName))
                                .Select(x => x.GetViewModel).ToList();

        }

        public List<FoodViewModel> GetFullList()
        {
            using var context = new DinerDatabaseBy7Work();
            return context.Components.Select(x => x.GetViewModel).ToList();
        }

        public FoodViewModel? Insert(FoodBindingModel model)
        {
            var newComponent = Food.Create(model);
            if (newComponent == null) { 
                return null; 
            }
            using var context = new DinerDatabaseBy7Work();    
            context.Components.Add(newComponent);
            context.SaveChanges();
            return newComponent.GetViewModel;
        }

        public FoodViewModel? Update(FoodBindingModel model)
        {
            using var context = new DinerDatabaseBy7Work();
            var component = context.Components.FirstOrDefault(x => x.ID == model.ID);
            if (component == null) { 
                return null; 
            }
            component.Update(model);
            context.SaveChanges();
            return component.GetViewModel;
        }
    }
}