<?php
error_reporting(E_ALL);
ini_set('display_errors', 1);

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

$serialNumber = $_GET['sn'] ?? '';

if (empty($serialNumber)) {
    echo json_encode(['rx_power' => null, 'error' => 'Serial number kosong']);
    exit;
}

function getRxPowerFromGenieACS($serialNumber) {
    $query = json_encode(["_id" => $serialNumber]);
    $encodedQuery = urlencode($query); // penting untuk URL-safe

    $url = "http://localhost:7557/devices/?query={$encodedQuery}";

    $ch = curl_init();
    curl_setopt($ch, CURLOPT_URL, $url);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);

    $response = curl_exec($ch);

    if ($response === false) {
        return ['rx_power' => null, 'error' => curl_error($ch)];
    }

    curl_close($ch);

    $data = json_decode($response, true);

    if (!isset($data[0]['VirtualParameters']['RXPower']['_value'])) {
        return ['rx_power' => null, 'error' => 'RX Power tidak ditemukan'];
    }

    $rxPowerValue = $data[0]['VirtualParameters']['RXPower']['_value'];
    return ['rx_power' => $rxPowerValue];
}

$result = getRxPowerFromGenieACS($serialNumber);
echo json_encode($result);