<?php

class RsvEmailSender {

    private function headers(): array {
        return [
            'From: ' . get_bloginfo('name') . ' <' . get_option('admin_email') . '>',
            'Content-Type: text/html; charset=UTF-8',
        ];
    }

    private function do_send(string $to, string $subject, string $body): void {
        $success = wp_mail($to, $subject, $body, $this->headers());
        if (!$success) {
            throw new \RuntimeException('wp_mail failed for ' . $to);
        }
    }

    public function send(string $to, string $subject, string $body): void {
        $this->do_send($to, $subject, $body);
    }
}