<?php

namespace PSX\Http\Filter;

use PSX\Http\FilterChainInterface;
use PSX\Http\FilterInterface;
use PSX\Http\RequestInterface;
use PSX\Http\ResponseInterface;
use Psr\Log\LoggerAwareInterface;
use Psr\Log\LoggerInterface;

/**
 * FilterChain
 *
 * @author  Christoph Kappestein <christoph.kappestein@gmail.com>
 * @license http://www.apache.org/licenses/LICENSE-2.0
 * @link    http://phpsx.org
 */
class FilterChain implements FilterChainInterface, LoggerAwareInterface
{
    /** @var array */
    protected $filters;

    /** @var \PSX\Http\FilterChainInterface */
    protected $filterChain;

    /** @var \Psr\Log\LoggerInterface */
    protected $logger;

    /**
     * @param array|\Traversable $filters
     * @param FilterChainInterface|null $filterChain
     */
    public function __construct($filters = [], FilterChainInterface $filterChain = null)
    {
        $this->filters     = [];
        $this->filterChain = $filterChain;

        foreach ($filters as $filter) {
            $this->on($filter);
        }
    }

    /**
     * @inheritdoc
     */
    public function setLogger(LoggerInterface $logger)
    {
        $this->logger = $logger;
    }

    /**
     * @inheritdoc
     */
    public function on($filter)
    {
        if ($filter instanceof FilterInterface) {
            $this->filters[] = $filter;
        } elseif ($filter instanceof \Closure) {
            $this->filters[] = $filter;
        } elseif (is_callable($filter)) {
            $this->filters[] = $filter;
        } else {
            throw new \InvalidArgumentException('Invalid filter must be either a \Closure or ' . FilterInterface::class);
        }
    }

    /**
     * @inheritdoc
     */
    public function handle(RequestInterface $request, ResponseInterface $response)
    {
        $filter = array_shift($this->filters);

        if ($filter === null) {
            // if we have no filters check whether we have a parent filter chain
            // which should be called next
            if ($this->filterChain !== null) {
                $this->filterChain->handle($request, $response);
            }
        } elseif ($filter instanceof FilterInterface) {
            if ($this->logger !== null) {
                $this->logger->info('Filter execute ' . get_class($filter));
            }

            $filter->handle($request, $response, $this);
        } elseif ($filter instanceof \Closure) {
            $filter($request, $response, $this);
        } elseif (is_callable($filter)) {
            call_user_func_array($filter, array($request, $response, $this));
        } else {
            throw new \RuntimeException('Invalid filter value');
        }
    }
}
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