<?php

declare(strict_types=1);
/**
 * This file is part of Hyperf.
 *
 * @link     https://www.hyperf.io
 * @document https://hyperf.wiki
 * @contact  group@hyperf.io
 * @license  https://github.com/hyperf/hyperf/blob/master/LICENSE
 */

namespace Hyperf\Dispatcher;

use Hyperf\Dispatcher\Exceptions\InvalidArgumentException;
use Psr\Container\ContainerInterface;
use Psr\Http\Server\MiddlewareInterface;

use function is_string;

abstract class AbstractRequestHandler
{
    protected int $offset = 0;

    /**
     * @param array $middlewares All middlewares to dispatch by dispatcher
     * @param MiddlewareInterface|object $coreHandler The core middleware of dispatcher
     */
    public function __construct(protected array $middlewares, protected $coreHandler, protected ContainerInterface $container)
    {
        $this->middlewares = array_values($this->middlewares);
    }

    protected function handleRequest($request)
    {
        if (! isset($this->middlewares[$this->offset])) {
            $handler = $this->coreHandler;
        } else {
            $handler = $this->middlewares[$this->offset];
            is_string($handler) && $handler = $this->container->get($handler);
        }
        if (! $handler || ! method_exists($handler, 'process')) {
            throw new InvalidArgumentException('Invalid middleware, it has to provide a process() method.');
        }
        return $handler->process($request, $this->next());
    }

    protected function next(): self
    {
        ++$this->offset;
        return $this;
    }
}