<?php

class ThemeController
{
    function toggle($f3)
    {
        $current = $f3->get('SESSION.theme') ?: 'light';
        $new_theme = ($current === 'light') ? 'dark' : 'light';
        $f3->set('SESSION.theme', $new_theme);

        $f3->reroute($f3->get('HEADERS.Referer') ?: '/');
    }
}