<?php
  /**
   * Copyright (c) 2013 Robin Appelman <icewind@owncloud.com>
   * This file is licensed under the Affero General Public License version 3 or
   * later.
   * See the COPYING-README file.
   */
  
  namespace OC\Files\Node;

  use OCP\Files\NotFoundException;
  use OCP\Files\NotPermittedException;
  
  class Node implements \OCP\Files\Node {
  	/**
  	 * @var \OC\Files\View $view
  	 */
  	protected $view;
  
  	/**
  	 * @var \OC\Files\Node\Root $root
  	 */
  	protected $root;
  
  	/**
  	 * @var string $path
  	 */
  	protected $path;
  
  	/**
  	 * @param \OC\Files\View $view

  	 * @param \OC\Files\Node\Root $root

  	 * @param string $path
  	 */
  	public function __construct($root, $view, $path) {
  		$this->view = $view;
  		$this->root = $root;
  		$this->path = $path;
  	}
  
  	/**
  	 * @param string[] $hooks
  	 */
  	protected function sendHooks($hooks) {
  		foreach ($hooks as $hook) {
  			$this->root->emit('\OC\Files', $hook, array($this));
  		}
  	}
  
  	/**
  	 * @param int $permissions
  	 * @return bool
  	 */
  	protected function checkPermissions($permissions) {
  		return ($this->getPermissions() & $permissions) === $permissions;
  	}
  
  	/**
  	 * @param string $targetPath
  	 * @throws \OCP\Files\NotPermittedException
  	 * @return \OC\Files\Node\Node
  	 */
  	public function move($targetPath) {
  		return;
  	}
  
  	public function delete() {
  		return;
  	}
  
  	/**
  	 * @param string $targetPath
  	 * @return \OC\Files\Node\Node
  	 */
  	public function copy($targetPath) {
  		return;
  	}
  
  	/**
  	 * @param int $mtime
  	 * @throws \OCP\Files\NotPermittedException
  	 */
  	public function touch($mtime = null) {
  		if ($this->checkPermissions(\OCP\PERMISSION_UPDATE)) {
  			$this->sendHooks(array('preTouch'));
  			$this->view->touch($this->path, $mtime);
  			$this->sendHooks(array('postTouch'));
  		} else {
  			throw new NotPermittedException();
  		}
  	}
  
  	/**
  	 * @return \OC\Files\Storage\Storage
  	 * @throws \OCP\Files\NotFoundException
  	 */
  	public function getStorage() {
  		list($storage,) = $this->view->resolvePath($this->path);
  		return $storage;
  	}
  
  	/**
  	 * @return string
  	 */
  	public function getPath() {
  		return $this->path;
  	}
  
  	/**
  	 * @return string
  	 */
  	public function getInternalPath() {
  		list(, $internalPath) = $this->view->resolvePath($this->path);
  		return $internalPath;
  	}
  
  	/**
  	 * @return int
  	 */
  	public function getId() {
  		$info = $this->view->getFileInfo($this->path);
  		return $info['fileid'];
  	}
  
  	/**
  	 * @return array
  	 */
  	public function stat() {
  		return $this->view->stat($this->path);
  	}
  
  	/**
  	 * @return int
  	 */
  	public function getMTime() {
  		return $this->view->filemtime($this->path);
  	}
  
  	/**
  	 * @return int
  	 */
  	public function getSize() {
  		return $this->view->filesize($this->path);
  	}
  
  	/**
  	 * @return string
  	 */
  	public function getEtag() {
  		$info = $this->view->getFileInfo($this->path);
  		return $info['etag'];
  	}
  
  	/**
  	 * @return int
  	 */
  	public function getPermissions() {
  		$info = $this->view->getFileInfo($this->path);
  		return $info['permissions'];
  	}
  
  	/**
  	 * @return bool
  	 */
  	public function isReadable() {
  		return $this->checkPermissions(\OCP\PERMISSION_READ);
  	}
  
  	/**
  	 * @return bool
  	 */
  	public function isUpdateable() {
  		return $this->checkPermissions(\OCP\PERMISSION_UPDATE);
  	}
  
  	/**
  	 * @return bool
  	 */
  	public function isDeletable() {
  		return $this->checkPermissions(\OCP\PERMISSION_DELETE);
  	}
  
  	/**
  	 * @return bool
  	 */
  	public function isShareable() {
  		return $this->checkPermissions(\OCP\PERMISSION_SHARE);
  	}
  
  	/**
  	 * @return Node
  	 */
  	public function getParent() {
  		return $this->root->get(dirname($this->path));
  	}
  
  	/**
  	 * @return string
  	 */
  	public function getName() {
  		return basename($this->path);
  	}
  
  	/**
  	 * @param string $path
  	 * @return string
  	 */
  	protected function normalizePath($path) {
  		if ($path === '' or $path === '/') {
  			return '/';
  		}
  		//no windows style slashes
  		$path = str_replace('\\', '/', $path);
  		//add leading slash
  		if ($path[0] !== '/') {
  			$path = '/' . $path;
  		}
  		//remove duplicate slashes
  		while (strpos($path, '//') !== false) {
  			$path = str_replace('//', '/', $path);
  		}
  		//remove trailing slash
  		$path = rtrim($path, '/');
  
  		return $path;
  	}
  
  	/**
  	 * check if the requested path is valid
  	 *
  	 * @param string $path
  	 * @return bool
  	 */
  	public function isValidPath($path) {
  		if (!$path || $path[0] !== '/') {
  			$path = '/' . $path;
  		}
  		if (strstr($path, '/../') || strrchr($path, '/') === '/..') {
  			return false;
  		}
  		return true;
  	}
  }