using AbstractFoodOrdersContracts.BindingModels;
using AbstractFoodOrdersContracts.SearchModels;
using AbstractFoodOrdersContracts.StoragesContracts;
using AbstractFoodOrdersContracts.ViewModels;
using AbstractFoodOrdersFileImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace AbstractFoodOrdersFileImplement.Implements
{
	public class ImplementerStorage:IImplementerStorage
	{
		private readonly DataFileSingleton source;
		public ImplementerStorage()
		{
			source = DataFileSingleton.GetInstance();
		}
		public List<ImplementerViewModel> GetFullList()
		{
			return source.Implementers
			.Select(x => x.GetViewModel)
			.ToList();
		}
		public List<ImplementerViewModel> GetFilteredList(ImplementerSearchModel model)
		{
			if (string.IsNullOrEmpty(model.ImplementerFIO))
			{
				return new();
			}
			return source.Implementers
			.Where(x => x.ImplementerFIO.Contains(model.ImplementerFIO))
			.Select(x => x.GetViewModel)
			.ToList();
		}
		public ImplementerViewModel? GetElement(ImplementerSearchModel model)
		{
			if (string.IsNullOrEmpty(model.ImplementerFIO) && string.IsNullOrEmpty(model.Password) && !model.Id.HasValue)
			{
				return null;
			}
			return source.Implementers
			.FirstOrDefault(x => (!string.IsNullOrEmpty(model.ImplementerFIO) && !string.IsNullOrEmpty(model.Password)
			&& x.ImplementerFIO == model.ImplementerFIO && x.Password == model.Password) ||
			(model.Id.HasValue && x.Id == model.Id))
			?.GetViewModel;
		}

		public ImplementerViewModel? Insert(ImplementerBindingModel model)
		{
			model.Id = source.Implementers.Count > 0 ? source.Implementers.Max(x => x.Id) + 1 : 1;
			var newImplementer = Implementer.Create(model);
			if (newImplementer == null)
			{
				return null;
			}
			source.Implementers.Add(newImplementer);
			source.SaveImplementers();
			return newImplementer.GetViewModel;
		}
		public ImplementerViewModel? Update(ImplementerBindingModel model)
		{
			var ingredient = source.Implementers.FirstOrDefault(x => x.Id == model.Id);
			if (ingredient == null)
			{
				return null;
			}
			ingredient.Update(model);
			source.SaveImplementers();
			return ingredient.GetViewModel;
		}
		public ImplementerViewModel? Delete(ImplementerBindingModel model)
		{
			var element = source.Implementers.FirstOrDefault(x => x.Id == model.Id);
			if (element != null)
			{
				source.Implementers.Remove(element);
				source.SaveImplementers();
				return element.GetViewModel;
			}
			return null;
		}
	}
}
