SUBD/Forum/ForumBusinessLogic/MessageLogic.cs

using ForumContracts.BindingModels;
using ForumContracts.BusinessLogicContracts;
using ForumContracts.SearchModels;
using ForumContracts.StoragesContracts;
using ForumContracts.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ForumBusinessLogic
{
    public class MessageLogic : IMessageLogic
    {
        private readonly IMessageStorage _messageStorage;

        public MessageLogic(IMessageStorage messageStorage)
        {
            _messageStorage = messageStorage;
        }

        public bool Create(MessageBindingModel model)
        {
            CheckModel(model);
            if (_messageStorage.Insert(model) == null)
            {
                return false;
            }
            return true;
        }

        public bool Delete(MessageBindingModel model)
        {
            CheckModel(model, false);
            if (_messageStorage.Delete(model) == null)
            {
                return false;
            }
            return true;
        }

        public MessageViewModel? ReadElement(MessageSearchModel model)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            var element = _messageStorage.GetElement(model);
            if (element == null)
            {
                return null;
            }
            return element;
        }

        public List<MessageViewModel>? ReadList(MessageSearchModel? model)
        {
            var list = model == null ? _messageStorage.GetFullList() : _messageStorage.GetFilteredList(model);
            if (list == null)
            {
                return null;
            }
            return list;
        }

        public string TestInsertList(int num, List<UserViewModel> users, List<TopicViewModel> topics)
        {
            return _messageStorage.TestInsertList(num, users, topics);
        }
        public string TestReadList(int num)
        {
            return _messageStorage.TestReadList(num);
        }
        public string TestJoinReadList(int num)
        {
            return _messageStorage.TestJoinReadList(num);
        }

        public bool Update(MessageBindingModel model)
        {
            CheckModel(model);
            if (_messageStorage.Update(model) == null)
            {
                return false;
            }
            return true;
        }

        private void CheckModel(MessageBindingModel model, bool withParams = true)
        {
            if (model == null)
            {
                throw new ArgumentNullException(nameof(model));
            }
            if (!withParams)
            {
                return;
            }
        }
    }
}