-module(oaspec@formatter).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/oaspec/formatter.gleam").
-export([error_to_string/1, format_files/1]).
-export_type([format_error/0]).

-if(?OTP_RELEASE >= 27).
-define(MODULEDOC(Str), -moduledoc(Str)).
-define(DOC(Str), -doc(Str)).
-else.
-define(MODULEDOC(Str), -compile([])).
-define(DOC(Str), -compile([])).
-endif.

-type format_error() :: gleam_not_found | {format_failed, integer()}.

-file("src/oaspec/formatter.gleam", 26).
?DOC(" Convert a format error to a human-readable string.\n").
-spec error_to_string(format_error()) -> binary().
error_to_string(Error) ->
    case Error of
        gleam_not_found ->
            <<"gleam command not found in PATH. Install Gleam to format generated code."/utf8>>;

        {format_failed, Code} ->
            <<"gleam format failed with exit code "/utf8,
                (erlang:integer_to_binary(Code))/binary>>
    end.

-file("src/oaspec/formatter.gleam", 12).
?DOC(" Format generated Gleam files in the given directories using `gleam format`.\n").
-spec format_files(list(binary())) -> {ok, nil} | {error, format_error()}.
format_files(Dirs) ->
    gleam@result:'try'(
        begin
            _pipe = oaspec_ffi:find_executable(<<"gleam"/utf8>>),
            gleam@result:replace_error(_pipe, gleam_not_found)
        end,
        fun(Gleam_path) ->
            Args = gleam@list:prepend(Dirs, <<"format"/utf8>>),
            Exit_code = oaspec_ffi:run_executable(Gleam_path, Args),
            case Exit_code of
                0 ->
                    {ok, nil};

                Code ->
                    {error, {format_failed, Code}}
            end
        end
    ).