-module(go_over@util@cache).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([pull_if_not_cached/5]).

-spec cache_name(binary()) -> binary().
cache_name(Path) ->
    filepath:join(Path, <<".go-over-cache"/utf8>>).

-spec file_cached(binary(), integer()) -> {ok, boolean()} | {error, nil}.
file_cached(Path, Max_age_seconds) ->
    _pipe = Path,
    _pipe@1 = cache_name(_pipe),
    _pipe@2 = simplifile:read(_pipe@1),
    _pipe@3 = gleam@result:nil_error(_pipe@2),
    _pipe@4 = gleam@result:'try'(
        _pipe@3,
        fun(_capture) -> gleam@int:base_parse(_capture, 10) end
    ),
    gleam@result:map(
        _pipe@4,
        fun(V) ->
            Cutoff = birl:from_unix(V + Max_age_seconds),
            case birl:compare(birl:utc_now(), Cutoff) of
                lt ->
                    true;

                eq ->
                    true;

                _ ->
                    false
            end
        end
    ).

-spec pull_if_not_cached(
    binary(),
    integer(),
    boolean(),
    fun(() -> nil),
    binary()
) -> nil.
pull_if_not_cached(Path, Max_age, Force_pull, Pullfn, Cache_message) ->
    case {Force_pull, file_cached(Path, Max_age)} of
        {false, {ok, true}} ->
            go_over@util@print:progress(
                <<"Cached: "/utf8, Cache_message/binary>>
            ),
            nil;

        {_, _} ->
            Pullfn(),
            Now = begin
                _pipe = birl:utc_now(),
                _pipe@1 = birl:to_unix(_pipe),
                gleam@int:to_string(_pipe@1)
            end,
            _pipe@2 = simplifile:create_directory_all(Path),
            go_over@util@util:hard_fail(
                _pipe@2,
                <<"could not write cache file for "/utf8, Path/binary>>
            ),
            _pipe@3 = Path,
            _pipe@4 = cache_name(_pipe@3),
            _pipe@5 = simplifile:write(_pipe@4, Now),
            go_over@util@util:hard_fail(
                _pipe@5,
                <<"could not write cache file for "/utf8, Path/binary>>
            ),
            nil
    end.