-module(gladvent@internal@runners).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([build_from_days_dir/1]).

-spec to_module_name(binary()) -> binary().
to_module_name(File) ->
    _pipe = File,
    _pipe@1 = gleam@string:replace(_pipe, <<".gleam"/utf8>>, <<""/utf8>>),
    _pipe@2 = gleam@string:replace(_pipe@1, <<".erl"/utf8>>, <<""/utf8>>),
    gleam@string:replace(_pipe@2, <<"/"/utf8>>, <<"@"/utf8>>).

-spec function_exists(integer(), binary(), gleam@erlang@atom:atom_(), binary()) -> {ok,
        fun((any()) -> any())} |
    {error, snag:snag()}.
function_exists(Year, Filename, Mod, Func_name) ->
    case gladvent_ffi:module_exists(Mod) of
        false ->
            _pipe = [<<"module "/utf8>>, Filename, <<" not found"/utf8>>],
            _pipe@1 = gleam@string:concat(_pipe),
            snag:error(_pipe@1);

        true ->
            _pipe@2 = Func_name,
            _pipe@3 = erlang:binary_to_atom(_pipe@2),
            _pipe@4 = gladvent_ffi:function_arity_one_exists(Mod, _pipe@3),
            _pipe@5 = gleam@result:replace_error(
                _pipe@4,
                snag:new(
                    <<<<<<<<<<<<<<"module "/utf8, "src/"/utf8>>/binary,
                                            (gleam@int:to_string(Year))/binary>>/binary,
                                        "/"/utf8>>/binary,
                                    Filename/binary>>/binary,
                                " does not export a function \""/utf8>>/binary,
                            Func_name/binary>>/binary,
                        "/1\""/utf8>>
                )
            ),
            snag:context(_pipe@5, <<"function missing"/utf8>>)
    end.

-spec get_runner(integer(), binary()) -> {ok,
        {integer(),
            {fun((gleam@dynamic:dynamic_()) -> gleam@dynamic:dynamic_()),
                fun((gleam@dynamic:dynamic_()) -> gleam@dynamic:dynamic_()),
                gleam@option:option(fun((binary()) -> gleam@dynamic:dynamic_()))}}} |
    {error, snag:snag()}.
get_runner(Year, Filename) ->
    gleam@result:then(
        begin
            _pipe = gleam@string:replace(Filename, <<"day_"/utf8>>, <<""/utf8>>),
            _pipe@1 = gleam@string:replace(
                _pipe,
                <<".gleam"/utf8>>,
                <<""/utf8>>
            ),
            _pipe@2 = gladvent@internal@parse:day(_pipe@1),
            snag:context(
                _pipe@2,
                gleam@string:append(
                    <<"cannot create runner for "/utf8>>,
                    Filename
                )
            )
        end,
        fun(Day) ->
            Module = begin
                _pipe@3 = (<<<<<<"aoc_"/utf8,
                            (gleam@int:to_string(Year))/binary>>/binary,
                        "/"/utf8>>/binary,
                    Filename/binary>>),
                _pipe@4 = to_module_name(_pipe@3),
                erlang:binary_to_atom(_pipe@4)
            end,
            gleam@result:then(
                function_exists(Year, Filename, Module, <<"pt_1"/utf8>>),
                fun(Pt_1) ->
                    gleam@result:then(
                        function_exists(Year, Filename, Module, <<"pt_2"/utf8>>),
                        fun(Pt_2) ->
                            {ok,
                                {Day,
                                    {Pt_1,
                                        Pt_2,
                                        gleam@option:from_result(
                                            function_exists(
                                                Year,
                                                Filename,
                                                Module,
                                                <<"parse"/utf8>>
                                            )
                                        )}}}
                        end
                    )
                end
            )
        end
    ).

-spec build_from_days_dir(integer()) -> {ok,
        gleam@dict:dict(integer(), {fun((gleam@dynamic:dynamic_()) -> gleam@dynamic:dynamic_()),
            fun((gleam@dynamic:dynamic_()) -> gleam@dynamic:dynamic_()),
            gleam@option:option(fun((binary()) -> gleam@dynamic:dynamic_()))})} |
    {error, snag:snag()}.
build_from_days_dir(Year) ->
    _pipe = gladvent_ffi:find_files(
        <<"day_*.gleam"/utf8>>,
        <<"src/aoc_"/utf8, (gleam@int:to_string(Year))/binary>>
    ),
    _pipe@1 = gleam@list:try_map(
        _pipe,
        fun(_capture) -> get_runner(Year, _capture) end
    ),
    _pipe@2 = gleam@result:map(_pipe@1, fun maps:from_list/1),
    snag:context(
        _pipe@2,
        <<"failed to generate runners list from filesystem"/utf8>>
    ).