-module(glats@message).
-compile([no_auto_import, nowarn_unused_vars]).

-export([new/2, set_reply_to/2, set_header/3]).
-export_type([message/0]).

-type message() :: {message,
        binary(),
        gleam@map:map_(binary(), binary()),
        gleam@option:option(binary()),
        binary()}.

-spec new(binary(), binary()) -> message().
new(Subject, Body) ->
    {message, Subject, gleam@map:new(), none, Body}.

-spec set_reply_to(message(), binary()) -> message().
set_reply_to(Message, Reply_to) ->
    erlang:setelement(4, Message, {some, Reply_to}).

-spec set_header(message(), binary(), binary()) -> message().
set_header(Message, Key, Value) ->
    erlang:setelement(
        3,
        Message,
        begin
            _pipe = erlang:element(3, Message),
            gleam@map:insert(_pipe, Key, Value)
        end
    ).