<?php

/*

 * This file is part of the Assetic package, an OpenSky project.

 *

 * (c) 2010-2011 OpenSky Project Inc

 *

 * For the full copyright and license information, please view the LICENSE

 * file that was distributed with this source code.

 */

namespace Assetic\Factory\Resource;

/**

 * A resource is something formulae can be loaded from.

 *

 * @author Kris Wallsmith <kris.wallsmith@gmail.com>

 */

class DirectoryResource implements IteratorResourceInterface

{

    private $path;

    private $pattern;

    /**

     * Constructor.

     *

     * @param string $path    A directory path

     * @param string $pattern A filename pattern

     */

    public function __construct($path, $pattern = null)

    {

        if (DIRECTORY_SEPARATOR != substr($path, -1)) {

            $path .= DIRECTORY_SEPARATOR;

        }

        $this->path = $path;

        $this->pattern = $pattern;

    }

    public function isFresh($timestamp)

    {

        if (!is_dir($this->path) || filemtime($this->path) > $timestamp) {

            return false;

        }

        foreach ($this as $resource) {

            if (!$resource->isFresh($timestamp)) {

                return false;

            }

        }

        return true;

    }

    /**

     * Returns the combined content of all inner resources.

     */

    public function getContent()

    {

        $content = array();

        foreach ($this as $resource) {

            $content[] = $resource->getContent();

        }

        return implode("\n", $content);

    }

    public function __toString()

    {

        return $this->path;

    }

    public function getIterator()

    {

        return is_dir($this->path)

            ? new DirectoryResourceIterator($this->getInnerIterator())

            : new \EmptyIterator();

    }

    protected function getInnerIterator()

    {

        return new DirectoryResourceFilterIterator(new \RecursiveDirectoryIterator($this->path), $this->pattern);

    }

}

/**

 * An iterator that converts file objects into file resources.

 *

 * @author Kris Wallsmith <kris.wallsmith@gmail.com>

 * @access private

 */

class DirectoryResourceIterator extends \RecursiveIteratorIterator

{

    public function current()

    {

        return new FileResource(parent::current()->getPathname());

    }

}

/**

 * Filters files by a basename pattern.

 *

 * @author Kris Wallsmith <kris.wallsmith@gmail.com>

 * @access private

 */

class DirectoryResourceFilterIterator extends \RecursiveFilterIterator

{

    protected $pattern;

    public function __construct(\RecursiveDirectoryIterator $iterator, $pattern = null)

    {

        parent::__construct($iterator);

        $this->pattern = $pattern;

    }

    public function accept()

    {

        $file = $this->current();

        $name = $file->getBasename();

        if ($file->isDir()) {

            return '.' != $name[0];

        } else {

            return null === $this->pattern || 0 < preg_match($this->pattern, $name);

        }

    }

    public function getChildren()

    {

        return new self(new \RecursiveDirectoryIterator($this->current()->getPathname()), $this->pattern);

    }

}