Implement commercial calendars: booking_open, specialists, expire without type downgrade.

Refs EventHub/EventHubBack#54

src/handlers/handler_utils.erl

@@ -443,7 +443,8 @@ calendar_to_json(Calendar) ->
     settings       => Calendar#calendar.settings,
     tags           => Calendar#calendar.tags,
     type           => Calendar#calendar.type,
-    confirmation   => Calendar#calendar.confirmation,
+    confirmation   => confirmation_to_json(Calendar#calendar.confirmation),
+    booking_open   => logic_calendar:booking_open(Calendar),
     rating_avg     => Calendar#calendar.rating_avg,
     rating_count   => Calendar#calendar.rating_count,
     status         => Calendar#calendar.status,
@@ -452,6 +453,11 @@ calendar_to_json(Calendar) ->
     updated_at     => datetime_to_iso8601(Calendar#calendar.updated_at)
   }.
 
+confirmation_to_json(auto) -> <<"auto">>;
+confirmation_to_json(manual) -> <<"manual">>;
+confirmation_to_json({timeout, N}) when is_integer(N) -> #{<<"timeout">> => N};
+confirmation_to_json(Other) -> Other.
+
 %% @doc Преобразует #subscription{} в JSON-карту.
 -spec subscription_to_json(#subscription{}) -> map().
 subscription_to_json(Subscription) ->