<?php
declare(strict_types=1);
namespace App\Http;

final class Router
{
    private array $routes = [];

    public function add(string $method, string $path, callable $handler): void {
        $regex = '#^' . preg_replace('#\{(\w+)\}#', '(?P<$1>[^/]+)', $path) . '$#';
        $this->routes[] = [strtoupper($method), $regex, $handler];
    }

    public function dispatch(Request $req): Response {
        foreach ($this->routes as [$method, $regex, $handler]) {
            if ($req->method() !== $method) continue;
            if (preg_match($regex, $req->path(), $m)) {
                // Decode captured params: a camera_id/zone_id with a space or Korean text is
                // %-encoded in the URL, so without this GET /api/zones/{camera} never matches
                // what POST /api/zones stored.
                $params = array_map('rawurldecode',
                    array_filter($m, 'is_string', ARRAY_FILTER_USE_KEY));
                return $handler($req, $params);
            }
        }
        return Response::json(['error' => 'not_found'], 404);
    }
}