<?PHP
/**
 * Contains a class MDMailerHelper for improved handling of mails in the md ecosystem.
 */
declare(strict_types = 1);

use PHPMailer\PHPMailer\PHPMailer;
use PHPMailer\PHPMailer\SMTP;
use PHPMailer\PHPMailer\Exception;

/**
 * Class containing static functions for an easier handling of mails.
 */
final class MDMailerHelper {

    /**
     * PGP-encrypts a message to a given email address.
     *
     * @param string $to  Recipient email address.
     * @param string $msg Message contents.
     *
     * @return string
     */
    public static function pgp_encrypt(string $to, string $msg):string {

        $msg = shell_exec("echo " . escapeshellarg($msg) . " | gpg2 --always-trust --recipient " . escapeshellarg($to) . " --encrypt --armor --local-user " . escapeshellarg(MD_CONF_EMAIL::PGP_ENC_KEY) . " --sign");
        if ($msg === null) return "Error encrypting message";
        return $msg;

    }

    /**
     * Constructor.
     *
     * @return PHPMailer
     */
    public static function setup_PHPMailer():PHPMailer {

        $mail = new PHPMailer(true);

        //Server settings
        # $mail->SMTPDebug = SMTP::DEBUG_SERVER;              // Enable verbose debug output
        $mail->isSMTP();                                    // Send using SMTP
        $mail->Host       = MD_CONF_EMAIL::SMTP_HOST;       // Set the SMTP server to send through
        $mail->SMTPAuth   = true;                                   // Enable SMTP authentication
        $mail->Username   = MD_CONF_EMAIL::SMTP_USERNAME;   // SMTP username
        $mail->Password   = MD_CONF_EMAIL::SMTP_PASSWORD;   // SMTP password
        $mail->SMTPSecure = PHPMailer::ENCRYPTION_SMTPS;    // Enable TLS encryption; `PHPMailer::ENCRYPTION_SMTPS` encouraged
        $mail->Port       = 465;                            // TCP port to connect to, use 465 for `PHPMailer::ENCRYPTION_SMTPS` above

        $mail->setFrom(MD_CONF_EMAIL::SMTP_FROM, MD_CONF_EMAIL::SMTP_DISPLAYED_FROM);
        $mail->addReplyTo(MD_CONF_EMAIL::SMTP_REPLY_TO_DEFAULT);

        return $mail;

    }

}