using DinerContracts.BindingModels;
using DinerContracts.SearchModels;
using DinerContracts.StoragesContracts;
using DinerContracts.ViewModels;
using DinerFileImplement.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DinerFileImplement.Implements {
	public class ClientStorage : IClientStorage {

		private readonly DataFileSingleton _source;

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

		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.SaveClient();
			return newClient.GetViewModel;
		}

		public ClientViewModel? Update(ClientBindingModel model) {
			var client = _source.Clients.FirstOrDefault(x => x.ID == model.ID);
			if (client == null) {
				return null;
			}
			client.Update(model);
			_source.SaveClient();
			return client.GetViewModel;
		}

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

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

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

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