<?php
// includes/url_key.php
if (!defined('ABSPATH')) exit;

function allspice_url_key(string $u): string {
    $u = trim($u ?? '');
    if ($u === '') return '';
    try {
        $parts = wp_parse_url($u);
        if (!is_array($parts)) {
            return trim($u);
        }
        $host = strtolower((string)($parts['host'] ?? ''));
        if ($host === '') {
            return trim($u);
        }
        if (strpos($host, 'www.') === 0) {
            $host = substr($host, 4);
        }
        $host = rtrim($host, '.');
        $path = (string)($parts['path'] ?? '');
        $path = preg_replace('#/{2,}#', '/', $path) ?? $path;
        $path = rtrim($path, '/');
        $path = preg_replace('#/index\.html?$#i', '', $path) ?? $path;
        $path = preg_replace('#\.html?$#i', '', $path) ?? $path;
        return $host . $path;
    } catch (\Throwable $e) {
        return trim($u);
    }
}