using HotelContracts.BindingModels;
using HotelContracts.BusinessLogicsContracts;
using HotelContracts.SearchModels;
using HotelContracts.StoragesContracts;
using HotelContracts.ViewModels;
using Microsoft.Extensions.Logging;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace HotelBusinessLogic.BusinessLogic
{
	public class ParticipantLogic : IParticipantLogic
	{
		private readonly ILogger _logger;
		private readonly IParticipantStorage _participantStorage;

		public ParticipantLogic(ILogger<ParticipantLogic> logger, IParticipantStorage participantStorage)
		{
			_logger = logger;
			_participantStorage = participantStorage;
		}

		public List<ParticipantViewModel>? ReadList(ParticipantSearchModel? model)
		{
			_logger.LogInformation("ReadList. FIO:{FIO}.Id:{Id}", model?.ParticipantFIO, model?.Id);

			var list = model == null ? _participantStorage.GetFullList() : _participantStorage.GetFilteredList(model);

			if (list == null)
			{
				_logger.LogInformation("ReadList return null list");
				return null;
			}

			_logger.LogInformation("ReadList. Count:{Count}", list.Count);

			return list;
		}

		public ParticipantViewModel? ReadElement(ParticipantSearchModel? model)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}

			_logger.LogInformation("ReadElement.FIO:{FIO}.Id:{Id}", model.ParticipantFIO, model.Id);

			var element = _participantStorage.GetElement(model);

			if (element == null)
			{
				_logger.LogInformation("ReadElement element not found");
				return null;
			}

			_logger.LogInformation("ReadElement find. Id:{Id}", element.Id);

			return element;
		}

		public bool Create(ParticipantBindingModel model)
		{
			CheckModel(model);

			var result = _participantStorage.Insert(model);

			if (result == null)
			{
				_logger.LogWarning("Insert error");
				return false;
			}

			return true;
		}

		public bool Update(ParticipantBindingModel model)
		{
			CheckModel(model);

			if (_participantStorage.Update(model) == null)
			{
				_logger.LogWarning("Update error");
				return false;
			}

			return true;
		}

		public bool Delete(ParticipantBindingModel model)
		{
			CheckModel(model, false);

			if (_participantStorage.Delete(model) == null)
			{
				_logger.LogWarning("Delete error");
				return false;
			}

			return true;
		}

		public void CheckModel (ParticipantBindingModel model, bool withParams = true)
		{
			if (model == null) 
				throw new ArgumentNullException(nameof(model));
			if (!withParams)
				return;

			if (string.IsNullOrEmpty(model.ParticipantFIO))
				throw new ArgumentNullException("Нет ФИО участника", nameof(model.ParticipantFIO));
			if (string.IsNullOrEmpty (model.Number))
				throw new ArgumentNullException("Нет номера участника", nameof(model.Number));
			var elementName = _participantStorage.GetElement(new ParticipantSearchModel
			{
				ParticipantFIO = model.ParticipantFIO
			});
			if (elementName != null && elementName.Id != model.Id)
			{
				throw new InvalidOperationException("Участник с таким именем уже есть");
			}
			_logger.LogInformation("Participant. FIO:{FIO}.Number:{Number}. Id:{Id}", model.ParticipantFIO, model.Number, model.Id);
		}
	}
}