<?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\Stream;
  
  /**
   * stream wrapper that provides a callback on stream close
   */
  class Close {
  	private static $callBacks = array();
  	private $path = '';
  	private $source;
  	private static $open = array();
  
  	public function stream_open($path, $mode, $options, &$opened_path) {
  		$path = substr($path, strlen('close://'));
  		$this->path = $path;
  		$this->source = fopen($path, $mode);
  		if (is_resource($this->source)) {
  			$this->meta = stream_get_meta_data($this->source);
  		}
  		self::$open[] = $path;
  		return is_resource($this->source);
  	}
  
  	public function stream_seek($offset, $whence = SEEK_SET) {
  		fseek($this->source, $offset, $whence);
  	}
  
  	public function stream_tell() {
  		return ftell($this->source);
  	}
  
  	public function stream_read($count) {
  		return fread($this->source, $count);
  	}
  
  	public function stream_write($data) {
  		return fwrite($this->source, $data);
  	}
  
  	public function stream_set_option($option, $arg1, $arg2) {
  		switch ($option) {
  			case STREAM_OPTION_BLOCKING:
  				stream_set_blocking($this->source, $arg1);
  				break;
  			case STREAM_OPTION_READ_TIMEOUT:
  				stream_set_timeout($this->source, $arg1, $arg2);
  				break;
  			case STREAM_OPTION_WRITE_BUFFER:
  				stream_set_write_buffer($this->source, $arg1, $arg2);
  		}
  	}
  
  	public function stream_stat() {
  		return fstat($this->source);
  	}
  
  	public function stream_lock($mode) {
  		flock($this->source, $mode);
  	}
  
  	public function stream_flush() {
  		return fflush($this->source);
  	}
  
  	public function stream_eof() {
  		return feof($this->source);
  	}
  
  	public function url_stat($path) {
  		$path = substr($path, strlen('close://'));
  		if (file_exists($path)) {
  			return stat($path);
  		} else {
  			return false;
  		}
  	}
  
  	public function stream_close() {
  		fclose($this->source);
  		if (isset(self::$callBacks[$this->path])) {
  			call_user_func(self::$callBacks[$this->path], $this->path);
  		}
  	}
  
  	public function unlink($path) {
  		$path = substr($path, strlen('close://'));
  		return unlink($path);
  	}
  
  	public static function registerCallback($path, $callback) {
  		self::$callBacks[$path] = $callback;
  	}
  }