public IActionResult Calendar(int skip = 0) => _authenticationProvider.SomeIfAdministrator(User).Map(
administrator =>
{
var now = DateTime.UtcNow;
var nowMonth = new DateTime(now.Year, now.Month, 1);
var month = nowMonth.AddMonths(-skip);
var talks = _talkService.List(month, month.AddMonths(1), administrator.City);
return((IActionResult)View(new TalkCalendarView(month, CityView.FromDomain(administrator.City), talks.Select(TalkView.FromDomain).ToArray())));
}
).ValueOr(() => RedirectToAction("Administrator", "Authentication"));