<?php
declare(strict_types=1);
header('Content-Type: application/json');
ini_set('display_errors', '0');

require_once __DIR__ . '/protecao.php';

if (!file_exists(__DIR__ . '/../vendor/autoload.php')) {
    echo json_encode(['ok' => false, 'error' => 'vendor not found: ' . __DIR__ . '/../vendor/autoload.php']);
    exit;
}
require __DIR__ . '/../vendor/autoload.php';

use PhpMqtt\Client\MqttClient;
use PhpMqtt\Client\ConnectionSettings;

$uid   = trim($_POST['uid']   ?? '');
$value = (int)($_POST['value'] ?? -1);

if ($uid === '' || $value < 0 || $value > 255) {
    http_response_code(400);
    echo json_encode(['ok' => false, 'error' => 'parametros invalidos']);
    exit;
}

try {
    $settings = (new ConnectionSettings())
        ->setUsername('xupa')
        ->setPassword('xupa')
        ->setUseTls(true)
        ->setTlsSelfSignedAllowed(true)
        ->setConnectTimeout(5)
        ->setSocketTimeout(3);

    $mqtt = new MqttClient('mqtt.xupas.mywire.org', 8883, 'web-brightness-' . getmypid());
    $mqtt->connect($settings, false);

    $payload = json_encode(['cmd' => 'BRIGHTNESS', 'value' => $value]);
    $mqtt->publish("esp/$uid/cmd", $payload, 1, false);

    $mqtt->disconnect();

    echo json_encode(['ok' => true, 'uid' => $uid, 'value' => $value]);

} catch (Throwable $e) {
    http_response_code(500);
    echo json_encode(['ok' => false, 'error' => $e->getMessage()]);
}