-module(glepack@error).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch]).

-export([to_string/1]).
-export_type([decode_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.

?MODULEDOC(" This module contains the error types used in MessagePack encoding and decoding\n").

-type decode_error() :: invalid_format |
    incomplete_data |
    integer_too_large |
    invalid_utf8 |
    reserved_format |
    unknown_format |
    {unsupported_extension, integer()}.

-file("src/glepack/error.gleam", 50).
?DOC(" Converts a DecodeError to a human-readable string\n").
-spec to_string(decode_error()) -> binary().
to_string(Error) ->
    case Error of
        invalid_format ->
            <<"Invalid MessagePack format"/utf8>>;

        incomplete_data ->
            <<"Incomplete MessagePack data, more bytes needed"/utf8>>;

        integer_too_large ->
            <<"Integer too large for Gleam's Int type"/utf8>>;

        invalid_utf8 ->
            <<"Invalid UTF-8 string data"/utf8>>;

        reserved_format ->
            <<"Reserved MessagePack format (0xc1) encountered"/utf8>>;

        unknown_format ->
            <<"Unknown MessagePack format encountered"/utf8>>;

        {unsupported_extension, Type_id} ->
            <<"Unsupported extension type: "/utf8,
                (erlang:integer_to_binary(Type_id))/binary>>
    end.