PIbd-21_RazubaevSM_PlumbingRepair_Base/PlumbingRepair/PlumbingRepairFileImplement/Implements/MessageInfoStorage.cs

using PlumbingRepairContracts.BindingModels;
using PlumbingRepairContracts.SearchModels;
using PlumbingRepairContracts.StoragesContracts;
using PlumbingRepairContracts.ViewModels;
using PlumbingRepairFileImplement.Models;

namespace PlumbingRepairFileImplement.Implements
{
    public class MessageInfoStorage : IMessageInfoStorage
    {
        private readonly DataFileSingleton source;

        public MessageInfoStorage()
        {
            source = DataFileSingleton.GetInstance();
        }

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

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

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

        public MessageInfoViewModel? Insert(MessageInfoBindingModel model)
        {
            var newMessageInfo = MessageInfo.Create(model);
            if (newMessageInfo == null)
            {
                return null;
            }
            source.Messages.Add(newMessageInfo);
            source.SaveMessages();
            return newMessageInfo.GetViewModel;
        }
		public MessageInfoViewModel? Update(MessageInfoBindingModel model)
		{
			var message = source.Messages.FirstOrDefault(x => x.MessageId == model.MessageId);
			if (message == null)
			{
				return null;
			}
			message.Update(model);
			source.SaveMessages();
			return message.GetViewModel;
		}
	}
}