<?php
/*
 * Gallery - a web based photo album viewer and editor
 * Copyright (C) 2000-2008 Bharat Mediratta
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but
 * WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street - Fifth Floor, Boston, MA  02110-1301, USA.
 */

GalleryCoreApi::requireOnce('modules/exif/classes/ExifInterface_1_0.class');

/**
 * Implementation of the ExifInterface for pulling EXIF data from a set of target items
 * @package Exif
 * @subpackage Classes
 * @author Alan Harder <alan.harder@sun.com>
 * @author Georg Rehfeld <rehfeld@georg-rehfeld.de>
 * @version $Revision: 17580 $
 */
class ExifExtractor extends ExifInterface_1_0 {

    /**
     * @see ExifInterface_1_0::getMetaData
     */
    function getMetaData($itemIds, $properties=array()) {
	global $gallery;
	GalleryCoreApi::requireOnce('modules/exif/lib/exifer/exif.inc');

	if (!is_array($itemIds)) {
	    $itemIds = array($itemIds);
	}
	if (!is_array($properties)) {
	    $properties = array($properties);
	}

	$data = array();
	foreach ($itemIds as $itemId) {
	    list ($ret, $item) = GalleryCoreApi::loadEntitiesById($itemId, 'GalleryItem');
	    if ($ret) {
		return array($ret, null);
	    }
	    /* Only look at JPEG/raw DataItems.. */
	    if (!GalleryUtilities::isA($item, 'GalleryDataItem') ||
		    !preg_match('{^image/(p?jpeg(-cmyk)?|x-dcraw)$}', $item->getMimeType())) {
		continue;
	    }
	    list ($ret, $path) = $item->fetchPath();
	    if ($ret) {
		return array($ret, null);
	    }
	    $data[$itemId] = array();
	    $rawExifData = read_exif_data_raw($path, false);
	    GalleryCoreApi::requireOnce('modules/exif/classes/ExifHelper.class');
	    list ($ret, $iptcObj) = ExifHelper::getIptcObject($path);
	    if ($ret) {
		return array($ret, null);
	    }
	    foreach (ExifHelper::getExifKeys() as $property => $keyData) {
		if (!empty($properties) && !in_array($property, $properties)) {
		    continue;
		}
		for ($i = 1; $i < count($keyData); $i++) {
		    $value = ExifHelper::getExifValue($rawExifData, explode('.', $keyData[$i]));
		    if (!isset($value)) {
			$value = ExifHelper::getIptcValue($iptcObj, explode('.', $keyData[$i]));
		    }
		    if (isset($value)) {
			$value = ExifHelper::postProcessValue($property, $value);
			$data[$itemId][$property] =
			    array('title' => $keyData[0], 'value' => $value);
			break;
		    }
		}
	    }
	}

	return array(null, $data);
    }
}
?>