<?php

/**

 * @category    Fishpig

 * @package     Fishpig_iBanners

 * @license     http://fishpig.co.uk/license.txt

 * @author      Ben Tideswell <help@fishpig.co.uk>

 */

 

class Fishpig_iBanners_Helper_Image extends Mage_Core_Helper_Abstract

{

	/**

	 * Stores version of generic image uploader/resizer

	 *

	 * @var const string

	 */

	const VERSION_ID = '1.0.1';



	/**

	 * Storeage for image object, used for resizing images

	 *

	 * @var null/Varien_Image

	 */

	protected $_imageObject = null;

	

	/**

	 * Flag used to determine wether to recreate already cached image

	 *

	 * @var bool

	 */

	protected $_forceRecreate = false;

	

	/**

	 * Filename currently initialized in the image object

	 *

	 * @var null|string

	 */

	protected $_filename = '';



	/**

	 * The folder name used to store images

	 * This is relative to the media directory

	 *

	 * @var const string

	 */

	const IMAGE_FOLDER = 'ibanners';



	/**

	 * Retrieve the image URL where images are stored

	 *

	 * @return string

	 */

	public function getBaseImageUrl()

	{

		return Mage::getBaseUrl('media') . self::IMAGE_FOLDER . '/';

	}

	

	/**

	 * Retrieve the directory/path where images are stored

	 *

	 * @return string

	 */

	public function getBaseImagePath()

	{

		return Mage::getBaseDir('media') . DS . self::IMAGE_FOLDER . DS;

	}

	

	/**

	 * Retrieve the full image URL

	 * Null returned if image does not exist

	 *

	 * @param string $image

	 * @return string|null

	 */

	public function getImageUrl($image)

	{

		if ($this->imageExists($image)) {

			return $this->getBaseImageUrl() . $image;

		}

		

		return null;

	}

	

	/**

	 * Retrieve the full image path

	 * Null returned if image does not exist

	 *

	 * @param string $image

	 * @return string|null

	 */

	public function getImagePath($image)

	{

		if ($this->imageExists($image)) {

			return $this->getBaseImagePath() . $image;

		}

		

		return null;

	}

	

	/**

	 * determine whether the image exists

	 *

	 * @param string $image

	 * @return bool

	 */

	public function imageExists($image)

	{

		return is_file($this->getBaseImagePath() . $image);

	}



	/**

	 * Converts a filename, width and height into it's resized uri path

	 * returned path does not include base path

	 *

	 * @param string $filename

	 * @param int $width = null

	 * @param int $height = null

	 * @return string

	 */

	public function getResizedImageUrl($filename, $width = null, $height = null)

	{

		return $this->getBaseImageUrl() . $this->_getRelativeResizedImagePath($filename, $width, $height);

	}

	

	/**

	 * Converts a filename, width and height into it's resized path

	 * returned path does not include base path

	 *

	 * @param string $filename

	 * @param int $width = null

	 * @param int $height = null

	 * @return string

	 */

	public function getResizedImagePath($filename, $width = null, $height = null)

	{

		return $this->getBaseImagePath() . $this->_getRelativeResizedImagePath($filename, $width, $height);

	}



	/**

	 * Converts a filename, width and height into it's resized path

	 * returned path does not include base path

	 *

	 * @param string $filename

	 * @param int $width = null

	 * @param int $height = null

	 * @return string

	 */	

	protected function _getRelativeResizedImagePath($filename, $width = null, $height = null)

	{

		if (!is_null($width) || !is_null($height)) {

			return 'cache' . DS . trim($width.'x'.$height, 'x') . DS . $filename;

		}

		

		return $filename;

	}



	/**

	 * Initialize the image object

	 * This sets up the image object for resizing and caching

	 *

	 * @param Fishpig_AttributeSplash_Model_Page $page

	 * @param string $attribute

	 * @return Fishpig_AttributeSplash_Helper_Image

	 */

	public function init(Fishpig_AttributeSplash_Model_Page $page, $attribute = 'image')

	{

		$this->_imageObject = null;

		$this->_forceRecreate = false;

		$this->_filename = null;

		

		if ($imagePath = $this->getImagePath($page->getData($attribute))) {

			$this->_imageObject = new Varien_Image($imagePath);

			$this->_filename = basename($imagePath);

			

			$this->keepAspectRatio(true);

		}

		

		return $this;

	}



	/**

	 * Resize the image loaded into the image object

	 *

	 * @param int $width = null

	 * @param int $height = null

	 * @return string

	 */

	public function resize($width = null, $height = null)

	{

		if ($this->isActive()) {

			$cachedFilename = $this->getResizedImagePath($this->_filename, $width, $height);

				

			if ($this->_forceRecreate || !is_file($cachedFilename)) {

				$this->_imageObject->resize($width, $height);

				$this->_imageObject->save($cachedFilename);

			}

			

			return $this->getResizedImageUrl($this->_filename, $width, $height);;

		}

	

		return '';

	}

	

	/**

	 * Keep the frame or add a white space

	 *

	 * @param bool $val

	 */

	public function keepFrame($val)

	{

		if ($this->isActive()) {

			$this->_imageObject->keepFrame($val);

		}

		

		return $this;

	}

	

	/**

	 * Keep the aspect ratio of an image

	 *

	 * @param bool $val

	 */

	public function keepAspectRatio($val)

	{

		if ($this->isActive()) {

			$this->_imageObject->keepAspectRatio($val);

		}

		

		return $this;

	}

	

	/**

	 * Don't increase the size of an image, only decrease

	 *

	 * @param bool $val

	 */

	public function constrainOnly($val)

	{

		if ($this->isActive()) {

			$this->_imageObject->constrainOnly($val);

		}

		

		return $this;

	}



	/**

	 * Determine whether to recreate image that already exists

	 *

	 * @param bool $val

	 */	

	public function forceRecreate($val)

	{

		if ($this->isActive()) {

			$this->_forceRecreate = $val;

		}

		

		return $this;

	}

	

	/**

	 * Determine whether the image object has been initialised

	 *

	 * @return bool

	 */

	public function isActive()

	{

		return is_object($this->_imageObject);

	}

	

	/**

	 * Upload an image based on the $fileKey

	 *

	 * @param string $fileKey

	 * @param string|null $filename - set a custom filename

	 * @return null|string - returns saved filename

	 */

	public function uploadImage($fileKey, $filename = null)

	{

		try {

			$uploader = new Varien_File_Uploader($fileKey);

			$uploader->setAllowedExtensions(array('jpg','jpeg','gif','png'));

			$uploader->setAllowRenameFiles(true);

			$result = $uploader->save($this->getBaseImagePath());

			

			return $result['file'];

		}

		catch (Exception $e) {

			if ($e->getCode() != Varien_File_Uploader::TMP_NAME_EMPTY) {

				throw $e;

			}

		}

		

		return null;

	}

}