<?php
declare(strict_types=1);

header('Content-Type: application/json');

require __DIR__ . '/db.php';   // ligação PDO
require __DIR__ . '/mqtt.php'; // função mqtt_publish($topic,$msg)

$data = json_decode(file_get_contents('php://input'), true);
if (!$data || !isset($data['uid']) || !isset($data['cmd'])) {
    http_response_code(400);
    echo json_encode(['error'=>'invalid_request']);
    exit;
}

$uid = $data['uid'];
$cmd = $data['cmd'];
$value = $data['value'] ?? null;

// ----------------------- MQTT -----------------------
$topic = "esp/$uid/cmd";

$msg = ['cmd' => $cmd];
if ($value !== null) $msg['value'] = $value;

mqtt_publish($topic, json_encode($msg, JSON_UNESCAPED_SLASHES));

// ----------------------- BD -------------------------
if ($cmd === 'BLOCK') {
    $stmt = $db->prepare("UPDATE contadores SET blocked = ? WHERE uid = ?");
    $stmt->execute([intval($value), $uid]);
}

echo json_encode(['ok'=>1]);