<?php

namespace NoccyLabs\React\Serial;

use Evenement\EventEmitterTrait;
use React\EventLoop\Loop;
use React\Promise\Deferred;
use React\Promise\PromiseInterface;
use React\Stream\DuplexResourceStream;
use React\Stream\ReadableStreamInterface;
use React\Stream\WritableStreamInterface;

class SerialFactory
{
    /**
     *
     *
     * @param string $device
     * @param int $baud
     * @param int $bits Bits per byte
     * @param Parity $parity
     * @param int $stop Stopbits
     * @return PromiseInterface<DuplexResourceStream>
     */
    public function open(string $device, int $baud = 9600, int $bits = 8, Parity $parity = Parity::NONE, int $stop = 1): PromiseInterface
    {
        $deferred = new Deferred();

        Loop::futureTick(static function () use ($device, $baud, $bits, $parity, $stop, $deferred) {
            $cmd = "stty -F ".escapeshellarg($device)." ".$baud." ".$parity->value." ".escapeshellarg("cs".$bits)." ".($stop==1?"-cstopb":"cstopb")." -echo -icrnl cbreak min 0 time 0";
            //echo $cmd."\n";
            exec($cmd);
            $fd = fopen($device, "a+");
            $stream = new DuplexResourceStream($fd);
            $deferred->resolve($stream);
        });

        return $deferred->promise();
    }


}