1 files changed, 53 insertions, 0 deletions
diff --git a/aoc2023/build/packages/gleam_otp/src/gleam@otp@intensity_tracker.erl b/aoc2023/build/packages/gleam_otp/src/gleam@otp@intensity_tracker.erl
new file mode 100644
index 0000000..8792f14
--- /dev/null
+++ b/aoc2023/build/packages/gleam_otp/src/gleam@otp@intensity_tracker.erl
@@ -0,0 +1,53 @@
+-module(gleam@otp@intensity_tracker).
+-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function]).
+
+-export([new/2, trim_window/3, add_event/1]).
+-export_type([intensity_tracker/0, too_intense/0]).
+
+-opaque intensity_tracker() :: {intensity_tracker,
+        integer(),
+        integer(),
+        list(integer())}.
+
+-type too_intense() :: too_intense.
+
+-spec new(integer(), integer()) -> intensity_tracker().
+new(Limit, Period) ->
+    {intensity_tracker, Limit, Period, []}.
+
+-spec now_seconds() -> integer().
+now_seconds() ->
+    erlang:monotonic_time(1).
+
+-spec trim_window(list(integer()), integer(), integer()) -> list(integer()).
+trim_window(Events, Now, Period) ->
+    case Events of
+        [] ->
+            [];
+
+        [Event | Events@1] ->
+            case Now >= (Event + Period) of
+                true ->
+                    [Event | trim_window(Events@1, Now, Period)];
+
+                false ->
+                    []
+            end
+    end.
+
+-spec add_event(intensity_tracker()) -> {ok, intensity_tracker()} |
+    {error, too_intense()}.
+add_event(Tracker) ->
+    Now = now_seconds(),
+    Events = trim_window(
+        [Now | erlang:element(4, Tracker)],
+        Now,
+        erlang:element(3, Tracker)
+    ),
+    case gleam@list:length(Events) >= erlang:element(2, Tracker) of
+        true ->
+            {error, too_intense};
+
+        false ->
+            {ok, erlang:setelement(4, Tracker, Events)}
+    end.