using SushiBarContracts.BindingModels;
using SushiBarContracts.SearchModels;
using SushiBarContracts.StoragesContracts;
using SushiBarContracts.ViewModels;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace SushiBarFileImplement
{
	public class ClientStorage : IClientStorage
	{
		private readonly DataFileSingleton source;

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

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

		public List<ClientViewModel> GetFilteredList(ClientSearchModel model)
		{
			if (string.IsNullOrEmpty(model.Email))
			{
				return new();
			}
			return source.Clients.Where(x => x.Email.Contains(model.Email)).Select(x => x.GetViewModel).ToList();
		}

		public ClientViewModel? GetElement(ClientSearchModel model)
		{
			if (string.IsNullOrEmpty(model.Email) && !model.Id.HasValue)
			{
				return null;
			}
			return source.Clients
				.FirstOrDefault(x => (!string.IsNullOrEmpty(model.Email) && x.Email == model.Email) ||
				(model.Id.HasValue && x.Id == model.Id))?.GetViewModel;
		}

		public ClientViewModel? Insert(ClientBindingModel model)
		{
			model.Id = source.Clients.Count > 0 ? source.Clients.Max(x => x.Id) + 1 : 1;
			var newClient = Client.Create(model);
			if (newClient == null)
			{
				return null;
			}
			source.Clients.Add(newClient);
			source.SaveClients();
			return newClient.GetViewModel;
		}

		public ClientViewModel? Update(ClientBindingModel model)
		{
			var ingredient = source.Clients.FirstOrDefault(x => x.Id == model.Id);
			if (ingredient == null)
			{
				return null;
			}
			ingredient.Update(model);
			source.SaveClients();
			return ingredient.GetViewModel;
		}

		public ClientViewModel? Delete(ClientBindingModel model)
		{
			var element = source.Clients.FirstOrDefault(x => x.Id == model.Id);
			if (element != null)
			{
				source.Clients.Remove(element);
				source.SaveClients();
				return element.GetViewModel;
			}
			return null;
		}
	}
}