-module(gilly@openapi@error).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/gilly/openapi/error.gleam").
-export([describe_error/1]).
-export_type([error/0]).

-type error() :: {json_error, gleam@json:decode_error()} |
    {unsupported_version, binary()} |
    {parse_error, list(gleam@dynamic@decode:decode_error())}.

-file("src/gilly/openapi/error.gleam", 38).
-spec describe_decode_errors(list(gleam@dynamic@decode:decode_error())) -> binary().
describe_decode_errors(Errors) ->
    gleam@string:join(
        gleam@list:map(
            Errors,
            fun(E) ->
                {decode_error, Expected, Found, Path} = E,
                Path_str = gleam@string:join(Path, <<" -> "/utf8>>),
                <<<<<<<<<<"Expected "/utf8, Expected/binary>>/binary,
                                " but got "/utf8>>/binary,
                            Found/binary>>/binary,
                        " at path "/utf8>>/binary,
                    Path_str/binary>>
            end
        ),
        <<"; "/utf8>>
    ).

-file("src/gilly/openapi/error.gleam", 28).
-spec describe_json_error(gleam@json:decode_error()) -> binary().
describe_json_error(Error) ->
    case Error of
        unexpected_end_of_input ->
            <<"Unexpected end of input"/utf8>>;

        {unexpected_byte, Byte} ->
            <<"Unexpected byte: "/utf8, Byte/binary>>;

        {unexpected_sequence, Seq} ->
            <<"Unexpected sequence: "/utf8, Seq/binary>>;

        {unable_to_decode, Errors} ->
            <<"Unable to decode: "/utf8,
                (describe_decode_errors(Errors))/binary>>
    end.

-file("src/gilly/openapi/error.gleam", 17).
-spec describe_error(error()) -> binary().
describe_error(Error) ->
    case Error of
        {json_error, Inner} ->
            <<"JSON parsing error: "/utf8, (describe_json_error(Inner))/binary>>;

        {unsupported_version, Version} ->
            <<"Unsupported OpenAPI version: "/utf8, Version/binary>>;

        {parse_error, Errors} ->
            <<"Failed to decode OpenAPI specification: "/utf8,
                (describe_decode_errors(Errors))/binary>>
    end.