PIbd-21_Kouvshinoff_T._A._AutomobilePlant/AutomobilePlant/AutomobilePlantFileImplement/Implements/MessageInfoStorage.cs

using AutomobilePlantContracts.BindingModels;
using AutomobilePlantContracts.SearchModels;
using AutomobilePlantContracts.StoragesContracts;
using AutomobilePlantContracts.ViewModels;
using AutomobilePlantFileImplement.Models;

namespace AutomobilePlantFileImplement.Implements
{
    public class MessageInfoStorage : IMessageInfoStorage
    {
        private readonly DataFileSingleton _source;
        public MessageInfoStorage()
        {
            _source = DataFileSingleton.GetInstance();
        }

        public MessageInfoViewModel? GetElement(MessageInfoSearchModel model)
        {
            if (model.MessageId != null)
            {
                return _source.Messages.FirstOrDefault(x => x.MessageId == model.MessageId)?.GetViewModel;
            }
            return null;
        }

        public List<MessageInfoViewModel> GetFilteredList(MessageInfoSearchModel model)
        {
            var messages = _source.Messages
                .Where(x => !model.ClientId.HasValue || x.ClientId == model.ClientId)
                .Select(x => x.GetViewModel)
                .ToList();
            if (!model.Page.HasValue || !model.PageSize.HasValue)
            {
                return messages.ToList();
            }
            return messages.Skip((model.Page.Value - 1) * model.PageSize.Value).Take(model.PageSize.Value).ToList();
        }

        public List<MessageInfoViewModel> GetFullList()
        {
            return _source.Messages
                .Select(x => x.GetViewModel)
                .ToList();
        }

        public MessageInfoViewModel? Insert(MessageInfoBindingModel model)
        {
            var newMessage = MessageInfo.Create(model);
            if (newMessage == null)
            {
                return null;
            }
            _source.Messages.Add(newMessage);
            _source.SaveMessages();
            return newMessage.GetViewModel;
        }

        public MessageInfoViewModel? Update(MessageInfoBindingModel model)
        {
            var message = _source.Messages.FirstOrDefault(x => x.MessageId.Equals(model.MessageId));
            if (message != null)
            {
                message.Update(model);
                _source.SaveMessages();
            }
            return message?.GetViewModel;
        }
    }
}