<?php

/*
 * This file is part of the Symfony package.
 *
 * (c) Fabien Potencier <fabien@symfony.com>
 *
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

namespace Symfony\Component\Config\Resource;

/**
 * DirectoryResource represents a resources stored in a subdirectory tree.
 *
 * @author Fabien Potencier <fabien@symfony.com>
 */
class DirectoryResource implements ResourceInterface
{
    private $resource;
    private $pattern;

    /**
     * Constructor.
     *
     * @param string $resource The file path to the resource
     * @param string $pattern  A pattern to restrict monitored files
     */
    public function __construct($resource, $pattern = null)
    {
        $this->resource = $resource;
        $this->pattern = $pattern;
    }

    /**
     * Returns the list of filtered file and directory childs of directory resource.
     *
     * @return array An array of files
     */
    public function getFilteredChilds()
    {
        if (!$this->exists()) {
            return array();
        }

        $iterator = new \RecursiveIteratorIterator(
            new \RecursiveDirectoryIterator($this->resource, \FilesystemIterator::SKIP_DOTS),
            \RecursiveIteratorIterator::SELF_FIRST
        );

        $childs = array();
        foreach ($iterator as $file) {
            // if regex filtering is enabled only return matching files
            if ($file->isFile() && !$this->hasFile($file)) {
                continue;
            }

            // always monitor directories for changes, except the .. entries
            // (otherwise deleted files wouldn't get detected)
            if ($file->isDir() && '/..' === substr($file, -3)) {
                continue;
            }

            $childs[] = $file;
        }

        return $childs;
    }

    /**
     * Returns child resources that matches directory filters.
     *
     * @return array
     */
    public function getFilteredResources()
    {
        $iterator = new \DirectoryIterator($this->resource);

        $resources = array();
        foreach ($iterator as $file) {
            // if regex filtering is enabled only return matching files
            if ($file->isFile() && !$this->hasFile($file)) {
                continue;
            }

            // always monitor directories for changes, except the .. entries
            // (otherwise deleted files wouldn't get detected)
            if ($file->isDir() && '/..' === substr($file, -3)) {
                continue;
            }

            // if file is dot - continue
            if ($file->isDot()) {
                continue;
            }

            if ($file->isFile()) {
                $resources[] = new FileResource($file->getRealPath());
            } elseif ($file->isDir()) {
                $resources[] = new DirectoryResource($file->getRealPath());
            }
        }

        return $resources;
    }

    /**
     * Returns a string representation of the Resource.
     *
     * @return string A string representation of the Resource
     */
    public function __toString()
    {
        return (string) $this->resource;
    }

    /**
     * Returns the resource tied to this Resource.
     *
     * @return mixed The resource
     */
    public function getResource()
    {
        return $this->resource;
    }

    /**
     * Returns check pattern.
     *
     * @return mixed
     */
    public function getPattern()
    {
        return $this->pattern;
    }

    /**
     * Checks that passed file exists in resource and matches resource filters.
     *
     * @param  SplFileInfo|string   $file
     *
     * @return Boolean
     */
    public function hasFile($file)
    {
        if (!$file instanceof \SplFileInfo) {
            $file = new \SplFileInfo($file);
        }

        if (0 !== strpos($file->getRealPath(), realpath($this->resource))) {
            return false;
        }

        if ($this->pattern) {
            return (bool) preg_match($this->pattern, $file->getBasename());
        }

        return true;
    }

    /**
     * Returns resource mtime.
     *
     * @return integer
     */
    public function getModificationTime()
    {
        clearstatcache(true, $this->resource);
        $newestMTime = filemtime($this->resource);

        foreach ($this->getFilteredChilds() as $file) {
            clearstatcache(true, (string) $file);
            $newestMTime = max($file->getMTime(), $newestMTime);
        }

        return $newestMTime;
    }

    /**
     * Returns true if the resource has not been updated since the given timestamp.
     *
     * @param integer $timestamp The last time the resource was loaded
     *
     * @return Boolean true if the resource has not been updated, false otherwise
     */
    public function isFresh($timestamp)
    {
        if (!$this->exists()) {
            return false;
        }

        return $this->getModificationTime() < $timestamp;
    }

    /**
     * Returns true if the resource exists in the filesystem.
     *
     * @return Boolean
     */
    public function exists()
    {
        return is_dir($this->resource);
    }

    /**
     * Returns unique resource ID.
     *
     * @return string
     */
    public function getId()
    {
        return md5($this->resource.$this->pattern);
    }

    public function serialize()
    {
        return serialize(array($this->resource, $this->pattern));
    }

    public function unserialize($serialized)
    {
        list($this->resource, $this->pattern) = unserialize($serialized);
    }
}