<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category  Zend
 * @package   Zend_Validate
 * @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license   http://framework.zend.com/license/new-bsd     New BSD License
 * @version   $Id: $
 */

/**
 * @see Zend_Validate_File_Size
 */
require_once 'Zend/Validate/File/Size.php';

/**
 * Validator for the size of all files which will be validated in sum
 *
 * @category  Zend
 * @package   Zend_Validate
 * @copyright Copyright (c) 2005-2008 Zend Technologies USA Inc. (http://www.zend.com)
 * @license   http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Validate_File_FilesSize extends Zend_Validate_File_Size
{
    /**
     * @const string Error constants
     */
    const TOO_BIG      = 'fileFilesSizeTooBig';
    const TOO_SMALL    = 'fileFilesSizeTooSmall';
    const NOT_READABLE = 'fileFilesSizeNotReadable';

    /**
     * @var array Error message templates
     */
    protected $_messageTemplates = array(
        self::TOO_BIG      => "The files in sum exceed the maximum allowed size",
        self::TOO_SMALL    => "All files are in sum smaller than required",
        self::NOT_READABLE => "One or more files can not be read"
    );

    /**
     * @var array Error message template variables
     */
    protected $_messageVariables = array(
        'min' => '_min',
        'max' => '_max'
    );

    /**
     * Minimum filesize
     *
     * @var integer
     */
    protected $_min;

    /**
     * Maximum filesize
     *
     * @var integer|null
     */
    protected $_max;

    /**
     * Internal file array
     *
     * @var array
     */
    protected $_files;

    /**
     * Internal file size counter
     *
     * @var integer
     */
    protected $_size;

    /**
     * Sets validator options
     *
     * Min limits the used diskspace for all files, when used with max=null it is the maximum filesize
     * It also accepts an array with the keys 'min' and 'max'
     *
     * @param  integer|array $min Minimum diskspace for all files
     * @param  integer       $max Maximum diskspace for all files
     * @return void
     */
    public function __construct($min, $max = null)
    {
        $this->_files = array();
        $this->_size  = 0;
        parent::__construct($min, $max);
    }

    /**
     * Defined by Zend_Validate_Interface
     *
     * Returns true if and only if the disk usage of all files is at least min and
     * not bigger than max (when max is not null).
     *
     * @param  string|array $value Real file to check for size
     * @param  array        $file  File data from Zend_File_Transfer
     * @return boolean
     */
    public function isValid($value, $file = null)
    {
        if (is_string($value)) {
            $value = array($value);
        }

        foreach ($value as $files) {
            // Is file readable ?
            if (!@is_readable($files)) {
                $this->_throw($file, self::NOT_READABLE);
                return false;
            }

            if (!isset($this->_files[$files])) {
                $this->_files[$files] = $files;
            } else {
                // file already counted... do not count twice
                continue;
            }

            // limited to 2GB files
            $size         = @filesize($files);
            $this->_size += $size;
            $this->_setValue($this->_size);
            if (($this->_max !== null) && ($this->_max < $this->_size)) {
                $this->_throw($file, self::TOO_BIG);
            }
        }

        // Check that aggregate files are >= minimum size
        if (($this->_min !== null) && ($this->_size < $this->_min)) {
            $this->_throw($file, self::TOO_SMALL);
        }

        if (count($this->_messages) > 0) {
            return false;
        } else {
            return true;
        }
    }
}