BeerService CRUD

using BeerOverflow.Data;
using BeerOverflow.Models;
using BeerOverflow.Services.DTO;
using BeerOverflow.Services.Provider.Contracts;
using System;
using System.Collections.Generic;
using System.Linq;

namespace BeerOverflow.Services
{
    public class BeerService
    {
        private readonly IDateTimeProvider dateTimeProvider;

        public BeerService(IDateTimeProvider dateTimeProvider)
        {
            this.dateTimeProvider = dateTimeProvider ?? throw new ArgumentNullException(nameof(dateTimeProvider));
        }
        public BeerDTO GetBeer(int id)
        {
            var beer = Database.Beers
                .Where(beer => beer.IsDeleted == false)
                .FirstOrDefault(beer => beer.BeerID == id);

            if (beer == null)
            {
                throw new ArgumentNullException();
            }

            var beerDTO = new BeerDTO
            {
                BeerID = beer.BeerID,
                Name = beer.Name,
                Type = beer.Type,
                Brewery = beer.Brewery,
                Country = beer.Country,
                AlcoholPerecentage = beer.AlcoholPerecentage,

            };

            return beerDTO;
        }


        public BeerDTO CreateBeer(BeerDTO beerDTO)
        {
            var beer = new Beer
            {
                BeerID = beerDTO.BeerID,
                Name = beerDTO.Name,
                Type = beerDTO.Type,
                Brewery = beerDTO.Brewery,
                Country = beerDTO.Country,
                AlcoholPerecentage = beerDTO.AlcoholPerecentage,
               // CreatedOn = this.dateTimeProvider.GetDateTime(),
            };

            Database.Beers.Add(beer);

            return beerDTO;
        }

        public BeerDTO UpdateBeer(int id, string newName, string newType,
            Brewery newBrewery, Country newCountry, double newAlcoholPerecentage)
        {
            var beer = Database.Beers
                .Where(beer => beer.IsDeleted == false)
                .FirstOrDefault(beer => beer.BeerID == id);


            beer.Name = newName;
            beer.Type = newType;
            beer.Brewery = newBrewery;
            beer.Country = newCountry;
            beer.AlcoholPerecentage = newAlcoholPerecentage;
            //beer.ModifiedOn = this.dateTimeProvider.GetDateTime();

            var beerDTO = new BeerDTO
            {
                BeerID = beer.BeerID,
                Name = beer.Name,
                Type = beer.Type,
                Brewery = beer.Brewery,
                Country = beer.Country,
                AlcoholPerecentage = beer.AlcoholPerecentage,
            };

            return beerDTO;
        }

        public bool DeleteBeer(int id)
        {
            try
            {
                var beer = Database.Beers
                    .Where(beer => beer.IsDeleted == false)
                    .FirstOrDefault(beer => beer.BeerID == id);

                beer.IsDeleted = true;
               // beer.DeletedOn = this.dateTimeProvider.GetDateTime();

                return true;
            }
            catch (Exception)
            {
                return false;
            }
        }
    }
}