<?php
session_start();
if (!isset($_SESSION['loggedin'])) {
    exit("unauthorized");
}

include "../database.php";
require_once "../plugins/sendgrid/config.php";
require "../plugins/sendgrid/sendgrid-php.php";

$user_id = $_POST["user_id"];

$sql        = "SELECT * FROM users WHERE id='" . $user_id . "'";
$result     = mysqli_query($con, $sql);
$user = mysqli_fetch_assoc($result);

$email = new \SendGrid\Mail\Mail();
$email->setFrom("info@n-hub.com", "NH-HR");
$email->addTo("".$user["email"]."", "".$user["name"]."  ".$user["surname"]."");
$email->SetTemplateId("d-791dcec7e5b64b86a725c020c4668eb4");
//Here is the Place holder values you need to replace.
$email->addDynamicTemplateData("NHHR_Email", "" . $user["email"] . "");
$sendgrid = new \SendGrid(SENDGRID_API_KEY);
try {
    $response = $sendgrid->send($email);

    echo "ok";
} catch (Exception $e) {
    echo 'Caught exception: ' . $e->getMessage() . "\n";

    echo "error";
}