<?php

/**
 * This example demonstrates upgrading a ProtocolStream to use a different protocol
 * than initially configured with.
 * 
 * Run the example and try entering some things such as:
 *   hello world
 *   foo "bar baz"
 * and finally:
 *   upgrade
 * After the upgrade command, it will only respond to JSON data:
 *   {"foo":"bar"}
 * 
 */

use NoccyLabs\React\Protocol\Json\JsonProtocol;
use NoccyLabs\React\Protocol\Line\LineProtocol;
use NoccyLabs\React\Protocol\ProtocolStream;
use React\Stream\CompositeStream;
use React\Stream\ReadableResourceStream;
use React\Stream\WritableResourceStream;

require_once __DIR__."/../vendor/autoload.php";

$stdin = new ReadableResourceStream(STDIN);
$stdout = new WritableResourceStream(STDOUT);
$stdio = new CompositeStream($stdin, $stdout);

$textProto = new LineProtocol(
    beforePackCb: function (array $msg): array {
        $out = [];
        $cmd = array_shift($msg);
        $out = [ $cmd, ...array_map("json_encode", $msg) ];
        return $out;
    }
);
$jsonProto = new JsonProtocol(
    frameSeparator: "\n"
);

$stream = new ProtocolStream($stdio, $textProto);
$stream->on("message", function (array $msg) use ($stream, $jsonProto) {
    if (array_is_list($msg)) {
        if (reset($msg) == 'upgrade') {
            $stream->send([ 'OK', 'Upgrading to JSON protocol']);
            $stream->upgrade($jsonProto);
            $stream->send([ 'info' => 'Now using JSON proto' ]);
        } else {
            $stream->send([ 'echo', json_encode($msg)]);
        }
    } else {
        $stream->send([ 'echo' => $msg ]);
    }
});