SUBD/Forum/ForumDatabase/Implements/MessageStorage.cs

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

namespace ForumDatabase.Implements
{
    public class MessageStorage : IMessageStorage
    {
        public MessageViewModel? Delete(MessageBindingModel model)
        {
            using var context = new ForumDatabase();
            var element = context.Messages.FirstOrDefault(rec => rec.Id == model.Id);
            if (element != null)
            {
                context.Messages.Remove(element);
                context.SaveChanges();
                return element.GetViewModel;
            }
            return null;
        }

        public MessageViewModel? GetElement(MessageSearchModel model)
        {
            if (!model.Id.HasValue)
            {
                return null;
            }
            using var context = new ForumDatabase();
            return context.Messages
                .Include(x => x.User)
                .Include(x => x.Topic)
                .FirstOrDefault(x => model.Id.HasValue && x.Id == model.Id).GetViewModel;
        }

        public List<MessageViewModel> GetFilteredList(MessageSearchModel model)
        {
            using var context = new ForumDatabase();
            return context.Messages
                .Include(x => x.User)
                .Include(x => x.Topic)
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public List<MessageViewModel> GetFullList()
        {
            using var context = new ForumDatabase();
            return context.Messages
                .Include(x => x.User)
                .Include(x => x.Topic)
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public MessageViewModel? Insert(MessageBindingModel model)
        {
            var newMessage = Message.Create(model);
            if (newMessage == null)
            {
                return null;
            }
            using var context = new ForumDatabase();
            context.Messages.Add(newMessage);
            context.SaveChanges();
            return newMessage.GetViewModel;
        }

        public MessageViewModel? Update(MessageBindingModel model)
        {
            using var context = new ForumDatabase();
            var component = context.Messages.FirstOrDefault(x => x.Id == model.Id);
            if (component == null)
            {
                return null;
            }
            component.Update(model);
            context.SaveChanges();
            return component.GetViewModel;
        }
    }
}