ComputerHardwareStore_YouAreProgrammer/ComputerHardwareStore/ComputerHardwareStoreDatabaseImplement/Implements/CommentStorage.cs

using ComputerHardwareStoreContracts.BindingModels;
using ComputerHardwareStoreContracts.SearchModels;
using ComputerHardwareStoreContracts.StorageContracts;
using ComputerHardwareStoreContracts.ViewModels;
using ComputerHardwareStoreDatabaseImplement.Models;

namespace ComputerHardwareStoreDatabaseImplement.Implements
{
    public class CommentStorage : ICommentStorage
    {
        public List<CommentViewModel> GetFullList()
        {
            using var context = new ComputerHardwareStoreDBContext();
            return context.Comments
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public List<CommentViewModel> GetFilteredList(CommentSearchModel model)
        {
            using var context = new ComputerHardwareStoreDBContext();
            return context.Comments
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public CommentViewModel? GetElement(CommentSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            using var context = new ComputerHardwareStoreDBContext();
            return context.Comments
                .FirstOrDefault(x => x.Id == model.Id)
                ?.GetViewModel;
        }

        public CommentViewModel? Insert(CommentBindingModel model)
        {
            using var context = new ComputerHardwareStoreDBContext();
            var newComment = Comment.Create(model);
            if (newComment == null)
            {
                return null;
            }
            context.Comments.Add(newComment);
            context.SaveChanges();
            return newComment.GetViewModel;
        }
        public CommentViewModel? Update(CommentBindingModel model)
        {
            using var context = new ComputerHardwareStoreDBContext();
            var element = context.Comments.FirstOrDefault(x => x.Id == model.Id);
            if (element == null)
            {
                return null;
            }
            element.Update(model);
            context.SaveChanges();
            return element.GetViewModel;
        }

        public CommentViewModel? Delete(CommentBindingModel model)
        {
            using var context = new ComputerHardwareStoreDBContext();
            var element = context.Comments.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Comments.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }
    }
}