<?php

use dokuwiki\Extension\AuthPlugin;

/**
 * Mail helper
 */
class helper_plugin_recommend_mail extends DokuWiki_Plugin
{
    /**
     * @param string $recipient
     * @param string $mailtext
     * @param string $sender
     * @return void
     */
    public function sendMail($recipient, $mailtext, $sender)
    {
        global $INPUT;

        $mailer = new Mailer();
        $mailer->bcc($recipient);
        $mailer->from($sender);

        $subject = $INPUT->str('subject');
        $mailer->subject($subject);
        $mailer->setBody($mailtext);
        $mailer->send();
    }

    /**
     * Processes recipients from input and returns an array of emails
     * with user groups resolved to individual users
     *
     * @param string $recipients
     * @return array
     * @throws Exception
     */
    public function resolveRecipients($recipients)
    {
        $resolved = [];

        $recipients = explode(',', $recipients);

        /** @var AuthPlugin $auth */
        global $auth;

        foreach ($recipients as $recipient) {
            $recipient = trim($recipient);

            if ($recipient[0] === '@') {
                $users = $auth->retrieveUsers(0, 0, ['grps' => substr($recipient, 1)]);
                foreach ($users as $user) {
                    $resolved[] = $user['mail'];
                }
            } else {
                if (!mail_isvalid($recipient)) {
                    throw new \Exception($this->getLang('err_recipient'));
                }
                $resolved[] = $recipient;
            }
        }
        return $resolved;
    }
}