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

-export([not_used_functions/2]).

-spec not_used_functions(
    internal@fs:files_dir(),
    gleam@option:option(internal@fs:files_dir())
) -> list({internal@ast_fun:public_fun(), internal@fs:file_path()}).
not_used_functions(Dir, Test_dir) ->
    Fp_with_ast = internal@ast:files_paths_with_ast(Dir, Test_dir),
    gleam@list:flat_map(
        Fp_with_ast,
        fun(_use0) ->
            {File_path, File_ast, Another_files_ast} = _use0,
            Public_funs = internal@ast_fun:public_funs(File_ast),
            gleam@list:flat_map(
                Public_funs,
                fun(Public_fun) ->
                    Is_public_fun_used = internal@ast_fun:is_pub_fun_used(
                        Another_files_ast,
                        Public_fun,
                        internal@fs:file_path_to_module_full_name(
                            Dir,
                            File_path
                        )
                    ),
                    case Is_public_fun_used of
                        true ->
                            [];

                        false ->
                            [{Public_fun, File_path}]
                    end
                end
            )
        end
    ).