public async Task AssignAgendaItemAsync(AgendaTrack agendaTrack, EntityId agendaSlotId, EntityId agendaItemId)
{
var agendaTracks = await _agendaTracksRepository.BrowseAsync(agendaTrack.ConferenceId);
var slotToAssign = agendaTrack.Slots.OfType <RegularAgendaSlot>().SingleOrDefault(s => s.Id == agendaSlotId);
if (slotToAssign is null)
{
throw new AgendaSlotNotFoundException(agendaSlotId);
}
var agendaItem = await _agendaItemsRepository.GetAsync((Guid)agendaItemId);
if (agendaItem is null)
{
throw new AgendaItemNotFoundException((Guid)agendaItemId);
}
var speakerIds = agendaItem.Speakers.Select(s => new SpeakerId(s.Id));
var speakersItems = await _agendaItemsRepository.BrowseAsync(speakerIds);
var speakersItemIds = speakersItems.Select(si => (Guid)si.Id).ToList();
var hasCollidingSpeakerSlots = agendaTracks
.SelectMany(at => at.Slots)
.OfType <RegularAgendaSlot>()
.Any(s => speakersItemIds.Contains(s.Id) && s.From <slotToAssign.To && slotToAssign.From> s.To);
if (hasCollidingSpeakerSlots)
{
throw new CollidingSpeakerAgendaSlotsException(agendaSlotId, agendaItemId);
}
agendaTrack.ChangeSlotAgendaItem(agendaSlotId, agendaItem);
}
