<?php defined("SYSPATH") or die("No direct script access.");
/**
 * Gallery - a web based photo album viewer and editor
 * Copyright (C) 2000-2010 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.
 */

/**
 * This is the API for handling exif data.
 */
class author_Core {
	static function fix($item) {
		if ($item->is_album()) { return false; }
		
		$mime = $item->mime_type;
		if ($mime == 'image/jpeg' || $mime == 'image/png' || $mime == 'image/gif') {}
		else { return false; }
		
	    $owner = ORM::factory("user")->where("id", "=", $item->owner_id)->find();
    	$user_name = $owner->full_name;
    	
		$exiv = module::get_var('author', 'exiv_path');
		$exivData = array();
		exec("$exiv -p a " . escapeshellarg($item->file_path()), $exivData);
		$has = array();
		$mod = array();
		foreach ($exivData as $line)
		{
			$tokens = preg_split('/\s+/', $line, 4);
			$has[ $tokens[0] ] = $tokens[3];
		}
		
		$candidates = array(
			$has['Xmp.dc.creator'],
			$has['Iptc.Application2.Byline'],
			$has['Exif.Image.Artist'],
			$user_name,
			'Unknown');
		
		foreach ($candidates as $cand) {
			if ($cand != '') { $byline = $cand; break; }
		}
		
		if (!array_key_exists('Exif.Image.Artist', $has)) { $mod['Exif.Image.Artist'] = $byline; }
		if (!array_key_exists('Xmp.dc.creator', $has)) { $mod['Xmp.dc.creator'] = $byline; }
		if (!array_key_exists('Iptc.Application2.Byline', $has)) { $mod['Iptc.Application2.Byline'] = $byline; }
		
		# Apply our own image terms URL.
		$terms = module::get_var("author", "usage_terms")
		if ($terms != '') {
			$mod['Xmp.xmpRights.UsageTerms'] = 'http://wiki.sverok.se/wiki/Bildbank-Bilder';
		}
		
		# ..and credit.
		$credit = module::get_var("author", "credit")
		if ($credit != '') {
			$mod['Iptc.Application2.Credit'] = $credit;
		}
		
		$line = $exiv . ' ';
		foreach ($mod as $key => $value) {
			$line .= "-M \"set $key " . escapeshellarg($value) . "\" ";
		}
		
		$files = array(
			$item->file_path(),
			$item->thumb_path(),
			$item->resize_path()
		);
		
		foreach ($files as $file) {
			system("$line " . escapeshellarg($file));
		}
		
		$record = ORM::factory("author_record")->where("item_id", "=", $item->id)->find();
		if (!$record->loaded()) {
			$record->item_id = $item->id;
		}
		$record->author = $byline;
		$record->dirty = 0;
		$record->save();
		return $byline;		
  	}
  	
}