<?php

/*                                                                        *
 * This script is part of the TYPO3 project - inspiring people to share!  *
 *                                                                        *
 * TYPO3 is free software; you can redistribute it and/or modify it under *
 * the terms of the GNU General Public License version 2 as published by  *
 * the Free Software Foundation.                                          *
 *                                                                        *
 * This script is distributed in the hope that it will be useful, but     *
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN-    *
 * TABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General      *
 * Public License for more details.                                       *
 *                                                                        */

/**
 * Resizes a given image (if required) and renders the respective img tag
 *
 * = Examples =
 *
 * <code title="Default">
 * <f:image src="EXT:myext/Resources/Public/typo3_logo.png" alt="alt text" />
 * </code>
 * <output>
 * <img alt="alt text" src="typo3conf/ext/myext/Resources/Public/typo3_logo.png" width="396" height="375" />
 * or (in BE mode):
 * <img alt="alt text" src="../typo3conf/ext/viewhelpertest/Resources/Public/typo3_logo.png" width="396" height="375" />
 * </output>
 *
 * <code title="Inline notation">
 * {f:image(src: 'EXT:viewhelpertest/Resources/Public/typo3_logo.png', alt: 'alt text', minWidth: 30, maxWidth: 40)}
 * </code>
 * <output>
 * <img alt="alt text" src="../typo3temp/pics/f13d79a526.png" width="40" height="38" />
 * (depending on your TYPO3s encryption key)
 * </output>
 *
 * <code title="non existing image">
 * <f:image src="NonExistingImage.png" alt="foo" />
 * </code>
 * <output>
 * Could not get image resource for "NonExistingImage.png".
 * </output>
 */
class Tx_Fluid_ViewHelpers_ImageViewHelper extends Tx_Fluid_Core_ViewHelper_AbstractTagBasedViewHelper {

	/**
	 * @var tslib_cObj
	 */
	protected $contentObject;

	/**
	 * @var string
	 */
	protected $tagName = 'img';

	/**
	 * @var t3lib_fe contains a backup of the current $GLOBALS['TSFE'] if used in BE mode
	 */
	protected $tsfeBackup;

	/**
	 * @var string
	 */
	protected $workingDirectoryBackup;

	/**
	 * @var Tx_Extbase_Configuration_ConfigurationManagerInterface
	 */
	protected $configurationManager;

	/**
	 * @param Tx_Extbase_Configuration_ConfigurationManagerInterface $configurationManager
	 * @return void
	 */
	public function injectConfigurationManager(Tx_Extbase_Configuration_ConfigurationManagerInterface $configurationManager) {
		$this->configurationManager = $configurationManager;
		$this->contentObject = $this->configurationManager->getContentObject();
	}

	/**
	 * Initialize arguments.
	 *
	 * @return void
	 * @author Bastian Waidelich <bastian@typo3.org>
	 */
	public function initializeArguments() {
		parent::initializeArguments();
		$this->registerUniversalTagAttributes();
		$this->registerTagAttribute('alt', 'string', 'Specifies an alternate text for an image', TRUE);
		$this->registerTagAttribute('ismap', 'string', 'Specifies an image as a server-side image-map. Rarely used. Look at usemap instead', FALSE);
		$this->registerTagAttribute('longdesc', 'string', 'Specifies the URL to a document that contains a long description of an image', FALSE);
		$this->registerTagAttribute('usemap', 'string', 'Specifies an image as a client-side image-map', FALSE);
	}

	/**
	 * Resizes a given image (if required) and renders the respective img tag
	 * @see http://typo3.org/documentation/document-library/references/doc_core_tsref/4.2.0/view/1/5/#id4164427
	 *
	 * @param string $src
	 * @param string $width width of the image. This can be a numeric value representing the fixed width of the image in pixels. But you can also perform simple calculations by adding "m" or "c" to the value. See imgResource.width for possible options.
	 * @param string $height height of the image. This can be a numeric value representing the fixed height of the image in pixels. But you can also perform simple calculations by adding "m" or "c" to the value. See imgResource.width for possible options.
	 * @param integer $minWidth minimum width of the image
	 * @param integer $minHeight minimum height of the image
	 * @param integer $maxWidth maximum width of the image
	 * @param integer $maxHeight maximum height of the image
	 *
	 * @return string rendered tag.
	 * @author Sebastian Böttger <sboettger@cross-content.com>
	 * @author Bastian Waidelich <bastian@typo3.org>
	 */
	public function render($src, $width = NULL, $height = NULL, $minWidth = NULL, $minHeight = NULL, $maxWidth = NULL, $maxHeight = NULL) {
		if (TYPO3_MODE === 'BE') {
			$this->simulateFrontendEnvironment();
		}
		$setup = array(
			'width' => $width,
			'height' => $height,
			'minW' => $minWidth,
			'minH' => $minHeight,
			'maxW' => $maxWidth,
			'maxH' => $maxHeight
		);
		if (TYPO3_MODE === 'BE' && substr($src, 0, 3) === '../') {
			$src = substr($src, 3);
		}
		$imageInfo = $this->contentObject->getImgResource($src, $setup);
		$GLOBALS['TSFE']->lastImageInfo = $imageInfo;
		if (!is_array($imageInfo)) {
			throw new Tx_Fluid_Core_ViewHelper_Exception('Could not get image resource for "' . htmlspecialchars($src) . '".' , 1253191060);
		}
		$imageInfo[3] = t3lib_div::png_to_gif_by_imagemagick($imageInfo[3]);
		$GLOBALS['TSFE']->imagesOnPage[] = $imageInfo[3];

		$imageSource = $GLOBALS['TSFE']->absRefPrefix . t3lib_div::rawUrlEncodeFP($imageInfo[3]);
		if (TYPO3_MODE === 'BE') {
			$imageSource = '../' . $imageSource;
			$this->resetFrontendEnvironment();
		}
		$this->tag->addAttribute('src', $imageSource);
		$this->tag->addAttribute('width', $imageInfo[0]);
		$this->tag->addAttribute('height', $imageInfo[1]);
		if ($this->arguments['title'] === '') {
			$this->tag->addAttribute('title', $this->arguments['alt']);
		}

		return $this->tag->render();
	}

	/**
	 * Prepares $GLOBALS['TSFE'] for Backend mode
	 * This somewhat hacky work around is currently needed because the getImgResource() function of tslib_cObj relies on those variables to be set
	 *
	 * @return void
	 * @author Bastian Waidelich <bastian@typo3.org>
	 */
	protected function simulateFrontendEnvironment() {
		$this->tsfeBackup = isset($GLOBALS['TSFE']) ? $GLOBALS['TSFE'] : NULL;
			// set the working directory to the site root
		$this->workingDirectoryBackup = getcwd();
		chdir(PATH_site);

		$typoScriptSetup = $this->configurationManager->getConfiguration(Tx_Extbase_Configuration_ConfigurationManagerInterface::CONFIGURATION_TYPE_FULL_TYPOSCRIPT);
		$GLOBALS['TSFE'] = new stdClass();
		$template = t3lib_div::makeInstance('t3lib_TStemplate');
		$template->tt_track = 0;
		$template->init();
		$template->getFileName_backPath = PATH_site;
		$GLOBALS['TSFE']->tmpl = $template;
		$GLOBALS['TSFE']->tmpl->setup = $typoScriptSetup;
		$GLOBALS['TSFE']->config = $typoScriptSetup;
	}

	/**
	 * Resets $GLOBALS['TSFE'] if it was previously changed by simulateFrontendEnvironment()
	 *
	 * @return void
	 * @author Bastian Waidelich <bastian@typo3.org>
	 * @see simulateFrontendEnvironment()
	 */
	protected function resetFrontendEnvironment() {
		$GLOBALS['TSFE'] = $this->tsfeBackup;
		chdir($this->workingDirectoryBackup);
	}
}