PIbd-21_Belianin_N.N._FurnitureAssembly/FurnitureAssembly/FurnitureAssemblyFileImplement/Implements/MessageInfoStorage.cs

using FurnitureAssemblyContracts.BindingModels;
using FurnitureAssemblyContracts.SearchModels;
using FurnitureAssemblyContracts.StoragesContracts;
using FurnitureAssemblyContracts.ViewModels;
using FurnitureAssemblyFileImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace FurnitureAssemblyFileImplement.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 res = _source.Messages
                .Where(x => !model.ClientId.HasValue || x.ClientId == model.ClientId)
                .Select(x => x.GetViewModel);
            if (!(model.Page.HasValue && model.PageSize.HasValue))
            {
                return res.ToList();
            }
            return res.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 res = _source.Messages.FirstOrDefault(x => x.MessageId.Equals(model.MessageId));
            if (res != null)
            {
                res.Update(model);
                _source.SaveMessages();
            }
            return res?.GetViewModel;
        }
    }
}