PIbd22_Kuznetsov_A.V._SewingDresses/SewingDresses/SewingDressesFileImplement/Implements/ImplementStorage.cs

using SewingDressesContracts.StoragesContracts;
using SewingDressesContracts.BindingModels;
using SewingDressesContracts.SearchModels;
using SewingDressesContracts.ViewModels;
using SewingDressesFileImplement.Models;

namespace SewingDressesFileImplement.Implements
{
	public class ImplementStorage : IImplementStorage
	{
		private readonly DataFileSingleton source;
		public ImplementStorage()
		{
			source = DataFileSingleton.GetInstance();
		}
		public List<ImplementViewModel> GetFullList()
		{
			return source.Implements
			.Select(x => x.GetViewModel)
		   .ToList();
		}
		public List<ImplementViewModel> GetFilteredList(ImplementSearchModel model)
		{
			if (string.IsNullOrEmpty(model.ImplementFIO) && string.IsNullOrEmpty(model.Password))
			{
				return new();
			}
			return source.Implements
			.Where(x => (string.IsNullOrEmpty(model.ImplementFIO) || x.ImplementFIO.Contains(model.ImplementFIO)) &&
			(string.IsNullOrEmpty(model.Password) || x.Password.Contains(model.Password)))
		   .Select(x => x.GetViewModel)
		   .ToList();
		}
		public ImplementViewModel? GetElement(ImplementSearchModel model)
		{
			return source.Implements
			.FirstOrDefault(x => (string.IsNullOrEmpty(model.ImplementFIO) || x.ImplementFIO == model.ImplementFIO) &&
								 (!model.Id.HasValue || x.Id == model.Id) && (string.IsNullOrEmpty(model.Password) || x.Password == model.Password))
			?.GetViewModel;
		}
		public ImplementViewModel? Insert(ImplementBindingModel model)
		{
			model.Id = source.Implements.Count > 0 ? source.Implements.Max(x =>
		   x.Id) + 1 : 1;
			var newImplement = Implement.Create(model);
			if (newImplement == null)
			{
				return null;
			}
			source.Implements.Add(newImplement);
			source.SaveImplements();
			return newImplement.GetViewModel;
		}
		public ImplementViewModel? Update(ImplementBindingModel model)
		{
			var Implement = source.Implements.FirstOrDefault(x => x.Id == model.Id);
			if (Implement == null)
			{
				return null;
			}
			Implement.Update(model);
			source.SaveImplements();
			return Implement.GetViewModel;
		}
		public ImplementViewModel? Delete(ImplementBindingModel model)
		{
			var element = source.Implements.FirstOrDefault(rec => rec.Id == model.Id);
			if (element != null)
			{
				source.Implements.Remove(element);
				source.SaveImplements();
				return element.GetViewModel;
			}
			return null;
		}
	}
}