<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * 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@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category    Mage
 * @package     Mage_Cms
 * @copyright   Copyright (c) 2010 Magento Inc. (http://www.magentocommerce.com)
 * @license     http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Wysiwyg Images Helper
 */
class Mage_Cms_Helper_Wysiwyg_Images extends Mage_Core_Helper_Abstract
{

    /**
     * Current directory path
     * @var string
     */
    protected $_currentPath;

    /**
     * Current directory URL
     * @var string
     */
    protected $_currentUrl;

    /**
     * Currenty selected store ID if applicable
     *
     * @var int
     */
    protected $_storeId = null;


    /**
     * Set a specified store ID value 
     *
     * @param <type> $store
     */
    public function setStoreId($store)
    {
        $this->_storeId = $store;
        return $this;
    }

    /**
     * Images Storage root directory
     *
     * @return string
     */
    public function getStorageRoot()
    {
        return Mage::getConfig()->getOptions()->getMediaDir() . DS;
    }

    /**
     * Images Storage base URL
     *
     * @return string
     */
    public function getBaseUrl()
    {
        return Mage::getBaseUrl('media') . '/';
    }

    /**
     * Ext Tree node key name
     *
     * @return string
     */
    public function getTreeNodeName()
    {
        return 'node';
    }

    /**
     * Encode path to HTML element id
     *
     * @param string $path Path to file/directory
     * @return string
     */
    public function convertPathToId($path)
    {
        $path = str_replace($this->getStorageRoot(), '', $path);
        return $this->idEncode($path);
    }

    /**
     * Decode HTML element id
     *
     * @param string $id
     * @return string
     */
    public function convertIdToPath($id)
    {
        $path = $this->idDecode($id);
        if (!strstr($path, $this->getStorageRoot())) {
            $path = $this->getStorageRoot() . $path;
        }
        return $path;
    }

    /**
     * File system path correction
     *
     * @param string $path Original path
     * @param boolean $trim Trim slashes or not
     * @return string
     */
    public function correctPath($path, $trim = true)
    {
        $path = strtr($path, "\\\/", DS . DS);
        if ($trim) {
            $path = trim($path, DS);
        }
        return $path;
    }

    /**
     * Return file system path as Url string
     *
     * @param string $path
     * @return string
     */
    public function convertPathToUrl($path)
    {
        return str_replace(DS, '/', $path);
    }

    /**
     * Check whether using static URLs is allowed
     *
     * @return boolean
     */
    public function isUsingStaticUrlsAllowed()
    {
        $checkResult = new StdClass;
        $checkResult->isAllowed = false;
        Mage::dispatchEvent('cms_wysiwyg_images_static_urls_allowed', array(
            'result'   => $checkResult,
            'store_id' => $this->_storeId
        ));
        return $checkResult->isAllowed;
    }

    /**
     * Prepare Image insertion declaration for Wysiwyg or textarea(as_is mode)
     *
     * @param string $filename Filename transferred via Ajax
     * @param bool $renderAsTag Leave image HTML as is or transform it to controller directive
     * @return string
     */
    public function getImageHtmlDeclaration($filename, $renderAsTag = false)
    {
        $fileurl = $this->getCurrentUrl() . $filename;
        $mediaPath = str_replace(Mage::getBaseUrl('media'), '', $fileurl);
        $directive = sprintf('{{media url="%s"}}', $mediaPath);
        if ($renderAsTag) {
            $html = sprintf('<img src="%s" alt="" />', $this->isUsingStaticUrlsAllowed() ? $fileurl : $directive);
        } else {
            if ($this->isUsingStaticUrlsAllowed()) {
                $html = $fileurl; // $mediaPath;
            } else {
                $directive = Mage::helper('core')->urlEncode($directive);
                $html = Mage::helper('adminhtml')->getUrl('*/cms_wysiwyg/directive', array('___directive' => $directive));
            }
        }
        return $html;
    }

    /**
     * Return path of the current selected directory or root directory for startup
     * Try to create target directory if it doesn't exist
     *
     * @throws Mage_Core_Exception
     * @return string
     */
    public function getCurrentPath()
    {
        if (!$this->_currentPath) {
            $currentPath = $this->getStorageRoot();
            $path = $this->_getRequest()->getParam($this->getTreeNodeName());
            if ($path) {
                $path = $this->convertIdToPath($path);
                if (is_dir($path)) {
                    $currentPath = $path;
                }
            }
            $io = new Varien_Io_File();
            if (!$io->isWriteable($currentPath) && !$io->mkdir($currentPath)) {
                $message = Mage::helper('cms')->__('The directory %s is not writable by server.',$currentPath);
                Mage::throwException($message);
            }
            $this->_currentPath = $currentPath;
        }
        return $this->_currentPath;
    }

    /**
     * Return URL based on current selected directory or root directory for startup
     *
     * @return string
     */
    public function getCurrentUrl()
    {
        if (!$this->_currentUrl) {
            $path = str_replace(Mage::getConfig()->getOptions()->getMediaDir(), '', $this->getCurrentPath());
            $path = trim($path, DS);
            $this->_currentUrl = Mage::app()->getStore($this->_storeId)->getBaseUrl('media') .
                                 $this->convertPathToUrl($path) . '/';
        }
        return $this->_currentUrl;
    }

    /**
     * Storage model singleton
     *
     * @return Mage_Cms_Model_Page_Wysiwyg_Images_Storage
     */
    public function getStorage()
    {
        return Mage::getSingleton('cms/wysiwyg_images_storage');
    }

    /**
     * Encode string to valid HTML id element, based on base64 encoding
     *
     * @param string $string
     * @return string
     */
    public function idEncode($string)
    {
        return strtr(base64_encode($string), '+/=', ':_-');
    }

    /**
     * Revert opration to idEncode
     *
     * @param string $string
     * @return string
     */
    public function idDecode($string)
    {
        $string = strtr($string, ':_-', '+/=');
        return base64_decode($string);
    }

    /**
     * Reduce filename by replacing some characters with dots
     *
     * @param string $filename
     * @param int $maxLength Maximum filename
     * @return string Truncated filename
     */
    public function getShortFilename($filename, $maxLength = 20)
    {
        if (strlen($filename) <= $maxLength) {
            return $filename;
        }
        return substr($filename, 0, $maxLength) . '...';
    }
}