public async Task UpdateSelectedOptionsAsync(EventChangeOptionsDto changeOptionsDto)
{
var eventEntity = await _eventsDbSet
.Include(x => x.EventOptions)
.Include(x => x.EventParticipants)
.Where(x => x.Id == changeOptionsDto.EventId && x.OrganizationId == changeOptionsDto.OrganizationId)
.Select(MapEventToJoinValidationDto)
.FirstOrDefaultAsync();
_eventValidationService.CheckIfEventExists(eventEntity);
// ReSharper disable once PossibleNullReferenceException
eventEntity.SelectedOptions = eventEntity.Options
.Where(option => changeOptionsDto.ChosenOptions.Contains(option.Id))
.ToList();
_eventValidationService.CheckIfRegistrationDeadlineIsExpired(eventEntity.RegistrationDeadline);
_eventValidationService.CheckIfProvidedOptionsAreValid(changeOptionsDto.ChosenOptions, eventEntity.SelectedOptions);
_eventValidationService.CheckIfJoiningNotEnoughChoicesProvided(eventEntity.MaxChoices, changeOptionsDto.ChosenOptions.Count());
_eventValidationService.CheckIfJoiningTooManyChoicesProvided(eventEntity.MaxChoices, changeOptionsDto.ChosenOptions.Count());
_eventValidationService.CheckIfSingleChoiceSelectedWithRule(eventEntity.SelectedOptions, OptionRules.IgnoreSingleJoin);
_eventValidationService.CheckIfUserParticipatesInEvent(changeOptionsDto.UserId, eventEntity.Participants);
await ValidateSingleJoinAsync(eventEntity, changeOptionsDto.OrganizationId, changeOptionsDto.UserId);
var participant = await _eventParticipantsDbSet
.Include(x => x.EventOptions)
.FirstAsync(p => p.EventId == changeOptionsDto.EventId && p.ApplicationUserId == changeOptionsDto.UserId);
participant.EventOptions.Clear();
participant.EventOptions = eventEntity.SelectedOptions;
await _uow.SaveChangesAsync(changeOptionsDto.UserId);
}
