<?php

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

use NoccyLabs\React\WebSocket\WebSocketInterface;
use NoccyLabs\React\WebSocket\WebSocketMiddleware;
use Psr\Http\Message\ServerRequestInterface;
use React\Http\HttpServer;
use React\Http\Message\Response;
use React\Promise\Promise;
use React\Socket\SocketServer;

// The middleware is at the core, as it intercepts and breaks out the websocket
// connections received by the HttpServer.
$websockets = new WebSocketMiddleware();
// The 'connection' handler works like expected. You can't however write any data
// to the client yet, as the websocket streams have not yet been returned.
$websockets->on('connection', function (WebSocketInterface $websocket) {
    // This just echoes text received, unless the websocket is part of a group.
    // In this case the message is sent to all websockets in the group.
    $websocket->on('text', function ($text) use ($websocket) {
        // Send a message with the group name starting with '#' to join a group.
        if (str_starts_with($text, '#')) {
            $websocket->setGroup(substr($text,1));
            $websocket->write("joined group {$text}");
        } else {
            // Echo back if not in group, send to group otherwise
            if (!$websocket->getGroup())
                $websocket->write($text);
            else
            foreach ($websocket->getGroup() as $member)
                $member->write($text);
        }
    });
});

// Create the server with our middleware chain:
//   error handler -> websocket handler -> http handler
$server = new HttpServer(
    // Error handler
    function (ServerRequestInterface $request, callable $next) {
        $promise = new Promise(function ($resolve) use ($next, $request) {
            $resolve($next($request));
        });
        return $promise->then(null, function (Exception $e) {
            return Response::plaintext(
                'Internal error: ' . $e->getMessage() . "\n"
            )->withStatus(Response::STATUS_INTERNAL_SERVER_ERROR);
        });
    },
    // WebSocket handler
    $websockets,
    // HTTP handler
    function (ServerRequestInterface $request) {
        return Response::plaintext("Hello world!");
    }
);

// Everything else is as expected!
$socket = new SocketServer("tcp://0.0.0.0:8000");
$server->listen($socket);