<?php
/**
 * This plugin is an example demonstrating the use of the various <i>image_html</i> filters.
 * Each effect is defined by a text file these sections (no individual section is required).
 *
 * <var><source>...</source></var><br>
 *  Documents the source of the effect
 *
 * <var><head>...</head></var><br>
 * 	Each effect will have a head section that contains the HTML to be emitted in the theme head.
 *
 * <var><class>...</class></var><br>
 * 	Elements from this section will be added to the class element of the <var><img src... /></var> tag.
 *
 * <var><extra>..</extra></var><br>
 * 	It is also possible to create a extra section for html that will be inserted into the
 * 	<var><img src... /></var> just befor the <var>/></var>. This can be used to insert <var>style="..."</var> or other elements.
 *
 * <var><validate><i>file path</i></validate></var><br>
 * 	Used specially for Effenberger effects, but applicable to similar situations. Causes the
 * 	named file to have its presence tested. If it is not present, the "effect" is not made available.
 * 	Multiple files are separated by semicolons. Each is tested.
 *
 * The following tokens are available to represent paths:
 *	<ul>
 *		<li><var>%WEBPATH%</v> to represent the WEB path to the Zenphoto installation.</li>
 *		<li><var>%SERVERPATH%</var> to represent the server path to the Zenphoto installation.</li>
 *		<li><var>%PLUGIN_FOLDER%</var> to represent the Zenphoto "extensions" folder.</li>
 *		<li><var>%USER_PLUGIN_FOLDER%</var> to represent the root "plugin" folder.</li>
 *		<li><var>%ZENFOLDER%</var> to represent the zp-core folder.</li>
 * </ul>
 *
 * Pixastic effects:<br>
 *	Included standard are several effects from {@link http://www.pixastic.com/ Pixastic}. Please visit their site for
 *	detailed documentation.
 *
 * Effenberger effects::<br>
 * 	Some effects which can be used are the javascript effects created by Christian Effenberger
 * 	which may be downloaded from his {@link http://www.netzgesta.de/cvi/ site}:
 *
 * 	<b>Note:</b> No effenberger effects are distributed with this plugin to conform with CVI licensing constraints.
 * 	To add an effect to the plugin, download the zip file from the site. Extract the effect
 * 	files and place in the image_effects folder (in the global plugins folder.)
 *
 * 	For instance, to add the <i>Reflex effect</i>, download <var>reflex.zip</var>, unzip it, and place <var>reflex.js</var>
 * 	in the folder. Check the image_effects foder in the zenphoto extensions to see if there is already
 * 	header file. If not create one in the <var>plugins/image_effects</var> folder. Use as a model one of the other
 * 	Effenberger effects header files.
 *
 * 	Included are some typical Effenberger files as examples. Simply provide the appropriate js script as above
 * 	to activate them.
 *
 *
 * @author Stephen Billard (sbillard)
 * @package plugins
 */

$plugin_description = gettext('Attaches "Image effects" to images and thumbnails.');
$plugin_author = "Stephen Billard (sbillard)";

$option_interface = 'image_effects';

zp_register_filter('standard_image_html', 'image_effects::std_images');
zp_register_filter('custom_image_html', 'image_effects::custom_images');
zp_register_filter('standard_album_thumb_html', 'image_effects::std_album_thumbs');
zp_register_filter('standard_image_thumb_html', 'image_effects::std_image_thumbs');
zp_register_filter('custom_album_thumb_html', 'image_effects::custom_album_thumbs');

if (defined('OFFSET_PATH') && OFFSET_PATH == 0) {
	zp_register_filter('theme_head', 'image_effects::effectsJS');
}

class image_effects {

	var $effects = NULL;

	function __construct() {
		$effect = getPluginFiles('*.txt','image_effects');
		foreach ($this->effects = array_keys($effect) as $suffix) {
			setOptionDefault('image_effects_random_'.$suffix, 1);
		}
	}


	/**
	 * Reports the supported options
	 *
	 * @return array
	 */
	function getOptionsSupported() {
		$list = array('random'=>'!');
		$docs = array();
		$effenberger = array('bevel','corner','crippleedge','curl','filmed','glossy','instant','reflex','slided','sphere');
		foreach($this->effects as $effect) {
			$rand[$effect] = 'image_effects_random_'.$effect;
			$effectdata = image_effects::getEffect($effect);
			$list[$effect] = $effect;
			$docs[chr(0).$effect] = array('key' => 'image_effect_'.$effect, 'order' => $effect, 'type' => OPTION_TYPE_CUSTOM);
			if (array_key_exists('source', $effectdata)) {
				$docs[chr(0).$effect]['desc'] = $effectdata['source'];
			} else {
				$docs[chr(0).$effect]['desc'] = gettext('No acknowledgement');
			}
			if (array_key_exists('error', $effectdata)) {
				$docs[chr(0).$effect]['desc'] .= '<p class="notebox">'.$effectdata['error'].'</p>';
				query('DELETE FROM '.prefix('options').' WHERE `name`="image_custom_random_'.$effect.'"');
				if (in_array($effect, $effenberger)) {
					$docs[chr(0).$effect]['desc'] .= '<p class="notebox">'.gettext('<strong>Note:</strong> Although this plugin supports <em>Effenberger effects</em>, due to licensing considerations no <em>Effenberger effects</em> scripts are included. See <a href="http://www.netzgesta.de/cvi/">CVI Astonishing Image Effects</a> by Christian Effenberger to select and download effects.').'</p>';
				}
			}
		}
		if (count($list) == 0) {
			return array(gettext('No effects') => array('key' => 'image_effect_none', 'type' => OPTION_TYPE_CUSTOM,
										'desc' => ''));
		}
		foreach (array('image_std_images','image_custom_images','image_std_image_thumbs','image_std_album_thumbs','image_custom_image_thumbs','image_custom_album_thumbs') as $option) {
			$effect = getOption($option);
			if ($effect && $effect!='!' && !array_key_exists($effect,$list)) {
				$error[$effect] = '<p class="errorbox">'.sprintf(gettext('<strong>Error:</strong> <em>%s</em> effect no longer exists.'),$effect).'</p>';
			}
		}
		$std = array(	gettext('Images (standard)') => array('key' => 'image_std_images', 'type' => OPTION_TYPE_SELECTOR,
										'order' => 0,
										'selections' => $list, 'null_selection' => gettext('none'),
										'desc' => gettext('Apply <em>effect</em> to images shown via the <code>printDefaultSizedImage()</code> function.')),
									gettext('Images (custom)') =>array('key' => 'image_custom_images', 'type' => OPTION_TYPE_SELECTOR,
										'order' => 0,
										'selections' => $list, 'null_selection' => gettext('none'),
										'desc' => gettext('Apply <em>effect</em> to images shown via the custom image functions.')),
									gettext('Image thumbnails (standard)') =>array('key' => 'image_std_image_thumbs', 'type' => OPTION_TYPE_SELECTOR,
										'order' => 0,
										'selections' => $list, 'null_selection' => gettext('none'),
										'desc' => gettext('Apply <em>effect</em> to images shown via the <code>printImageThumb()</code> function.')),
									gettext('Album thumbnails (standard)') =>array('key' => 'image_std_album_thumbs', 'type' => OPTION_TYPE_SELECTOR,
										'order' => 0,
										'selections' => $list, 'null_selection' => gettext('none'),
										'desc' => gettext('Apply <em>effect</em> to images shown via the <code>printAlbumThumbImage()</code> function.')),
									gettext('Image thumbnails (custom)') =>array('key' => 'image_custom_image_thumbs', 'type' => OPTION_TYPE_SELECTOR,
										'order' => 0,
										'selections' => $list, 'null_selection' => gettext('none'),
										'desc' => gettext('Apply <em>effect</em> to images shown via the custom image functions when <em>thumbstandin</em> is set.')),
									gettext('Album thumbnails  (custom)') =>array('key' => 'image_custom_album_thumbs', 'type' => OPTION_TYPE_SELECTOR,
										'order' => 0,
										'selections' => $list, 'null_selection' => gettext('none'),
										'desc' => gettext('Apply <em>effect</em> to images shown via the <code>printCustomAlbumThumbImage()</code> function.')),
									gettext('Random pool') => array('key' => 'image_effects_random_', 'type' => OPTION_TYPE_CHECKBOX_UL,
										'order' => 1,
										'checkboxes' => $rand,
										'desc' => gettext('Pool of effects for the <em>random</em> effect selection.')),
									chr(0) => array('key' => 'image_effects_docs', 'type' => OPTION_TYPE_CUSTOM,
										'order' => 9,
										'desc' => '<em>'.gettext('Acknowledgments').'</em>')
									);

		ksort($docs);
		return array_merge($std,$docs);
	}

	/**
	 * handles any custom options
	 *
	 * @param string $option
	 * @param mixed $currentValue
	 */
	function handleOption($option, $currentValue) {
		switch ($option) {
			case 'image_effect_none':
				gettext('No image effects found.');
				break;
			case 'image_effects_docs':
				echo '<em>'.gettext('Effect').'</em>';
				break;
			default:
				echo str_replace('image_effect_','',$option);
				break;
		}
	}

	static function effectsJS() {
		global $_image_effects_random;
		$effectlist = array_keys(getPluginFiles('*.txt','image_effects'));
		shuffle($effectlist);
		$common = array();
		do {
			$_image_effects_random = array_shift($effectlist);
			if (getOption('image_effects_random_'.$_image_effects_random)) {
				$effectdata = image_effects::getEffect($_image_effects_random);
				$invalid_effect = $effectdata && array_key_exists('error', $effectdata);
			} else {
				$invalid_effect = true;
			}
		} while ($_image_effects_random && $invalid_effect);

		if (!$_image_effects_random) echo "<br />random effect empty!";

		$selected_effects = array_unique(array(	getOption('image_std_images'), getOption('image_custom_images'),
																						getOption('image_std_album_thumbs'), getOption('image_std_image_thumbs'),
																						getOption('image_custom_album_thumbs'), $_image_effects_random));
		if (false !== $key = array_search('!', $selected_effects)) {
			unset($selected_effects[$key]);
		}
		if (count($selected_effects) > 0) {
			foreach ($selected_effects as $effect) {
				$effectdata = image_effects::getEffect($effect);
				if (array_key_exists('head', $effectdata)) {
					$common_data = trim($effectdata['head']);
					while ($common_data) {
						$i = strcspn ($common_data,'= >');
						if ($i === false) {
							$common_data = '';
						} else {
							$tag = '</'.trim(substr($common_data, 1, $i)).'>';
							$k = strpos($common_data, '>');
							$j = strpos($common_data,$tag, $k+1);
							if ($j === false) {
								$j = strpos($common_data,'/>');
								if ($j === false) {
									$common_data = '';
								} else {
									$j = $j + 2;
								}
							} else {
								$j = $j + strlen($tag);
							}
							if ($j === false) {
								$common_data = '';
							} else {
								$common_element = substr($common_data,0,$j);
								$common_data = trim(substr($common_data, strlen($common_element)));
								$common_element = trim($common_element);
								if (!in_array($common_element, $common)) {
									$common[] = $common_element;
								}
							}
						}
					}
				}
			}
			if (!empty($common)) {
				echo implode("\n",$common);
			}
		}
	}

	private static function getEffect($effect) {
		global $image_effects;
		$effectdata = array();
		$file = getPlugin('image_effects/'.internalToFilesystem($effect).'.txt');
		if (file_exists($file)) {
			$text = file_get_contents($file);
			foreach (array('head','class','extra','validate','common', 'source') as $tag) {
				$i = strpos($text, '<'.$tag.'>');
				if ($i !== false) {
					$j = strpos($text, '</'.$tag.'>');
					if ($j !== false) {
						$effectdata[$tag] = str_replace('%ZENFOLDER%',ZENFOLDER,
																str_replace('%SERVERPATH%',SERVERPATH,
																str_replace('%USER_PLUGIN_FOLDER%',USER_PLUGIN_FOLDER,
																str_replace('%PLUGIN_FOLDER%',PLUGIN_FOLDER,
																str_replace('%WEBPATH%',WEBPATH,
																substr($text,$s=$i+strlen($tag)+2,$j-$s))))));
					}
				}
			}
			if (empty($effectdata)) {
				return array('error'=>sprintf(gettext('<strong>Warning:</strong> <em>%1$s</em> invalid effect definition file'),$effect));
			}
			if (array_key_exists('validate', $effectdata)) {
				$effectdata['error'] = array();
				foreach (explode(';',$effectdata['validate']) as $file) {
					$file = trim($file);
					if ($file && !file_exists($file)) {
						$effectdata['error'][] = basename($file);
					}
				}
				if (count($effectdata['error']) > 0) {
					$effectdata['error'] = sprintf(ngettext('<strong>Warning:</strong> <em>%1$s</em> missing effect component: %2$s','<strong>Warning:</strong><em>%1$s</em> missing effect components: %2$s',count($effectdata['error'])),$effect,implode(', ',$effectdata['error']));
				} else {
					unset($effectdata['error']);
				}
				unset($effectdata['validate']);
			}
			$image_effects[$effect] = $effectdata;
			return $effectdata;
		} else {
				return array('error'=>sprintf(gettext('<strong>Warning:</strong> <em>%1$s</em> missing effect definition file'),$effect));
		}
	}

	private static function insertClass($html, $effect) {
		global $_image_effects_random;
		if ($effect=='!') {
			$effect = $_image_effects_random;
		}
		$effectData = image_effects::getEffect($effect);
		if (array_key_exists('error', $effectData)) {
			$html .= '<span class="errorbox">'.$effectData['error']."</span>\n";
		} else {
			if (array_key_exists('class', $effectData)) {
				$i = strpos($html,'<img');
				if ($i !== false) {
					$i = strpos($html, 'class=', $i);
					if ($i === false) {
						$i = strpos($html, '/>');
						$html = substr($html, 0, $i).'class="'.$effectData['class'].'" '.substr($html,$i);
					} else {
						$quote = substr($html, $i+6,1);
						$i = strpos($html, $quote, $i+7);
						$html = substr($html, 0, $i).' '.$effectData['class'].substr($html,$i);
					}
				}
			}
			if (array_key_exists('extra', $effectData)) {
				$i = strpos($html, '/>');
				$html = substr($html, 0, $i).' '.$effectData['extra'].' '.substr($html, $i);
			}
		}
		return $html;
	}

	static function std_images($html) {
		if ($effect = getOption('image_std_images')) {
			$html = image_effects::insertClass($html,	$effect);
		}
		return $html;
	}

	static function custom_images($html, $thumbstandin) {
		if ($thumbstandin) {
			if ($effect = getOption('image_custom_image_thumbs')) {
				$html = image_effects::insertClass($html,	$effect);
			}
		} else {
			if ($effect = getOption('image_custom_images')) {
				$html = image_effects::insertClass($html,	$effect);
			}
		}
		return $html;
	}

	static function std_album_thumbs($html) {
		if ($effect = getOption('image_std_album_thumbs')) {
			$html = image_effects::insertClass($html,	$effect);
		}
		return $html;
	}

	static function std_image_thumbs($html) {
		if ($effect = getOption('image_std_image_thumbs')) {
			$html = image_effects::insertClass($html,	$effect);
		}
		return $html;
	}

	static function custom_album_thumbs($html) {
		if ($effect = getOption('image_custom_album_thumbs')) {
			$html = image_effects::insertClass($html,	$effect);
		}
		return $html;
	}

}
?>