<?php
declare(strict_types=1);

namespace FDMTech;

final class Router
{
    /** No decoding ambiguity: public paths are ASCII single slugs. */
    public static function route(string $uri): array
    {
        $path = explode('?', $uri, 2)[0];
        if ($path === '/') {
            return ['slug' => 'home', 'path' => '/'];
        }
        if (!preg_match('~^/([a-z0-9]+(?:-[a-z0-9]+)*)(/?)$~D', $path, $match) || strlen($match[1]) > 160) {
            return ['error' => 404];
        }
        if ($match[1] === 'home') {
            return ['redirect' => '/'];
        }
        if (($match[2] ?? '') === '/') {
            return ['redirect' => '/' . $match[1]];
        }
        return ['slug' => $match[1], 'path' => $path];
    }
}