using GiftShopContracts.BindingModels;
using GiftShopContracts.SearchModels;
using GiftShopContracts.StoragesContracts;
using GiftShopContracts.ViewModels;
using GiftShopFileImplement.Models;

namespace GiftShopFileImplement.Implements
{
	public class ImplementerStorage : IImplementerStorage
	{
		private readonly DataFileSingleton _source;
		public ImplementerStorage()
		{
			_source = DataFileSingleton.GetInstance();
		}
		public ImplementerViewModel? Delete(ImplementerBindingModel model)
		{
			var res = _source.Implementers.FirstOrDefault(x => x.Id == model.Id);

			if (res != null)
			{
				_source.Implementers.Remove(res);
				_source.SaveImplementers();
			}
			return res?.GetViewModel;
		}

		public ImplementerViewModel? GetElement(ImplementerSearchModel model)
		{
			if (model.Id.HasValue)
				return _source.Implementers.FirstOrDefault(x => x.Id == model.Id)?.GetViewModel;

			if (model.ImplementerFIO != null && model.Password != null)
				return _source.Implementers
					.FirstOrDefault(x => x.ImplementerFIO.Equals(model.ImplementerFIO)
									  && x.Password.Equals(model.Password))
					?.GetViewModel;

			if (model.ImplementerFIO != null)
				return _source.Implementers.FirstOrDefault(x => x.ImplementerFIO.Equals(model.ImplementerFIO))?.GetViewModel;

			return null;
		}

		public List<ImplementerViewModel> GetFilteredList(ImplementerSearchModel model)
		{
			if (model == null)
			{
				return new();
			}

			if (model.Id.HasValue)
			{
				var res = GetElement(model);

				return res != null ? new() { res } : new();
			}

			if (model.ImplementerFIO != null)
			{
				return _source.Implementers
					.Where(x => x.ImplementerFIO.Equals(model.ImplementerFIO))
					.Select(x => x.GetViewModel)
					.ToList();
			}

			return new();
		}

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

		public ImplementerViewModel? Insert(ImplementerBindingModel model)
		{
			model.Id = _source.Implementers.Count > 0 ? _source.Implementers.Max(x => x.Id) + 1 : 1;

			var res = Implementer.Create(model);

			if (res != null)
			{
				_source.Implementers.Add(res);
				_source.SaveImplementers();
			}

			return res?.GetViewModel;
		}

		public ImplementerViewModel? Update(ImplementerBindingModel model)
		{
			var res = _source.Implementers.FirstOrDefault(x => x.Id == model.Id);

			if (res != null)
			{
				res.Update(model);
				_source.SaveImplementers();
			}

			return res?.GetViewModel;
		}
	}
}
