SUBD_Aleikin/Restaurant/RestaurantDatabaseImplement/Implements/ProviderStorage.cs

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

namespace RestaurantDatabaseImplement.Implements
{
    public class ProviderStorage : IProviderStorage
    {
        public List<ProviderViewModel> GetFullList()
        {
            using var context = new RestaurantDatabase();
            return context.Providers.Select(x => x.GetViewModel).ToList();
        }

        public List<ProviderViewModel> GetFilteredList(ProviderSearchModel model)
        {
            using var context = new RestaurantDatabase();
            if (model.Id.HasValue)
            {
                return context.Providers
                    .Where(x => x.Id == model.Id)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            else if (model.Name != null)
            {
                return context.Providers
                    .Where(x => x.Name == model.Name)
                    .Select(x => x.GetViewModel)
                    .ToList();
            }
            else
            {
                return new();
            }
        }

        public ProviderViewModel? GetElement(ProviderSearchModel model)
        {
            if (string.IsNullOrEmpty(model.Name) && !model.Id.HasValue)
            {
                return null;
            }
            using var context = new RestaurantDatabase();
            return context.Providers
                .FirstOrDefault(x => (!string.IsNullOrEmpty(model.Name) && x.Name == model.Name)
                || (model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
        }

        public ProviderViewModel? Insert(ProviderBindingModel model)
        {
            var newProvider = Provider.Create(model);
            if (newProvider == null)
            {
                return null;
            }
            using var context = new RestaurantDatabase();
            context.Providers.Add(newProvider);
            context.SaveChanges();
            return newProvider.GetViewModel;
        }

        public ProviderViewModel? Update(ProviderBindingModel model)
        {
            using var context = new RestaurantDatabase();
            var Provider = context.Providers.FirstOrDefault(x => x.Id == model.Id);
            if (Provider == null)
            {
                return null;
            }
            Provider.Update(model);
            context.SaveChanges();
            return Provider.GetViewModel;
        }

        public ProviderViewModel? Delete(ProviderBindingModel model)
        {
            using var context = new RestaurantDatabase();
            var element = context.Providers.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Providers.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}