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

namespace HotelBusinessLogic.BusinessLogic
{
	public class ConferenceLogic : IConferenceLogic
	{
		private readonly ILogger _logger;
		private readonly IConferenceStorage _conferenceStorage;

		public ConferenceLogic(ILogger<ConferenceLogic> logger, IConferenceStorage conferenceStorage)
		{
			_logger = logger;
			_conferenceStorage = conferenceStorage;
		}

		public List<ConferenceViewModel>? ReadList(ConferenceSearchModel? model)
		{
			_logger.LogInformation("ReadList. ConferenceName:{ConferenceName}.Id:{ Id}", model?.ConferenceName, model?.Id);

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

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

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

		public ConferenceViewModel? ReadElement(ConferenceSearchModel? model)
		{
			if (model == null)
				throw new ArgumentNullException(nameof(model));

			_logger.LogInformation("ReadElement. ConferenceName:{ConferenceName}.Id:{ Id}", model?.ConferenceName, model?.Id);

			var element = _conferenceStorage.GetElement(model);

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

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

			return element;
		}

		public bool Create(ConferenceBindingModel model)
		{
			CheckModel(model);
			model.ConferenceParticipants = new();

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

			return true;
		}

		public bool Update(ConferenceBindingModel model)
		{
			CheckModel(model);
			if (_conferenceStorage.Update(model) == null)
			{
				_logger.LogWarning("Update error");
				return false;
			}

			return true;
		}

		public bool Delete(ConferenceBindingModel model)
		{
			CheckModel(model, false);
			_logger.LogInformation("Delete. Id:{Id}", model.Id);

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

			return true;
		}

		public bool AddParticipantToConference(ConferenceSearchModel model, IParticipantModel participant)
		{
			if (model == null)
			{
				throw new ArgumentNullException(nameof(model));
			}

			_logger.LogInformation("AddParticipantToConference. ConferenceName:{ConferenceName}.Id:{ Id}", model.ConferenceName, model.Id);
			var element = _conferenceStorage.GetElement(model);

			if(element == null)
			{
				_logger.LogWarning("AddParticipantToConference element not found");
				return false;
			}

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

			element.ConferenceParticipants[participant.Id] = participant;

			_conferenceStorage.Update(new()
			{
				Id = element.Id,
				ConferenceName = element.ConferenceName,
				Subject = element.Subject,
				OrganiserId = element.OrganiserId,
				ConferenceParticipants = element.ConferenceParticipants,
			});

			return true;
		}

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

			if (!withParams)
				return;

			if (string.IsNullOrEmpty(model.ConferenceName)) 
				throw new ArgumentException("Нет названия конференции", nameof(model.ConferenceName));

			_logger.LogInformation("Conference. ConferenceName:{ConferenceName}. Id: { Id}", model.ConferenceName, model.Id);
		}
	}
}