feat: discovery tops for empty GET /v1/search. Refs EventHub/EventHubBack#50

Co-authored-by: Cursor <cursoragent@cursor.com>

test/unit/logic_search_tests.erl

@@ -29,7 +29,9 @@ logic_search_test_() ->
       {"Pagination", fun test_pagination/0},
       {"Sorting", fun test_sorting/0},
       {"Access control in search", fun test_access_control/0},
-      {"Empty search results", fun test_empty_search/0}
+      {"Empty search results", fun test_empty_search/0},
+      {"Discovery tops without filters", fun test_discovery_returns_tops/0},
+      {"Query switches to filtered search", fun test_discovery_with_q_uses_filter/0}
     ]}.
 
 %% Вспомогательные функции
@@ -239,3 +241,34 @@ test_empty_search() ->
   {Total, Results} = events_from(logic_search:search(<<"event">>, <<"nonexistent">>, OwnerId, #{})),
   ?assertEqual(0, Total),
   ?assertEqual([], Results).
+
+test_discovery_returns_tops() ->
+  OwnerId = create_test_user(user),
+  ViewerId = create_test_user(user),
+  CalendarId = create_test_calendar(OwnerId, commercial, []),
+  StartTime = eh_test_support:future_start(),
+  LowId = create_test_event(CalendarId, <<"Low Rated">>, <<"">>, StartTime, [], undefined),
+  HighId = create_test_event(CalendarId, <<"High Rated">>, <<"">>, StartTime, [], undefined),
+  {ok, _} = core_event:update(LowId, [{rating_avg, 1.0}, {rating_count, 1}]),
+  {ok, _} = core_event:update(HighId, [{rating_avg, 5.0}, {rating_count, 10}]),
+  stats_tops:init_tables(),
+  stats_tops:rebuild(),
+
+  {Total, [First | _]} = events_from(logic_search:search(<<"event">>, undefined, ViewerId, #{})),
+  ?assertEqual(2, Total),
+  ?assertMatch(#{title := <<"High Rated">>}, First).
+
+test_discovery_with_q_uses_filter() ->
+  OwnerId = create_test_user(user),
+  CalendarId = create_test_calendar(OwnerId, personal, []),
+  StartTime = eh_test_support:future_start(),
+  LowId = create_test_event(CalendarId, <<"Alpha">>, <<"">>, StartTime, [], undefined),
+  HighId = create_test_event(CalendarId, <<"Beta">>, <<"">>, StartTime, [], undefined),
+  {ok, _} = core_event:update(LowId, [{rating_avg, 1.0}]),
+  {ok, _} = core_event:update(HighId, [{rating_avg, 5.0}]),
+  stats_tops:init_tables(),
+  stats_tops:rebuild(),
+
+  {Total, Results} = events_from(logic_search:search(<<"event">>, <<"Alpha">>, OwnerId, #{})),
+  ?assertEqual(1, Total),
+  ?assertMatch([#{title := <<"Alpha">>}], Results).