* Link: http://code.shishnet.org/shimmie2/
 * License: GPLv2
 * Description: Show a list of uploaded images
 * Documentation:
 *  Here is a list of the search methods available out of the box;
 *  Shimmie extensions may provide other filters:
 *  
 *    - by tag, eg
 *      
 *        - cat
 *        
- pie
 *        
- somethi* -- wildcards are supported
 *      
 *
- size (=, <, >, <=, >=) width x height, eg
 *      
 *        - size=1024x768 -- a specific wallpaper size
 *        
- size>=500x500 -- no small images
 *        
- size<1000x1000 -- no large images
 *      
 *
- ratio (=, <, >, <=, >=) width : height, eg
 *      
 *        - ratio=4:3, ratio=16:9 -- standard wallpaper
 *        
- ratio=1:1 -- square images
 *        
- ratio<1:1 -- tall images
 *        
- ratio>1:1 -- wide images
 *      
 *
- filesize (=, <, >, <=, >=) size, eg
 *      
 *        - filesize>1024 -- no images under 1KB
 *        
- filesize<=3MB -- shorthand filesizes are supported too
 *      
 *
- id (=, <, >, <=, >=) number, eg
 *      
 *        - id<20 -- search only the first few images
 *        
- id>=500 -- search later images
 *      
 *
- user=Username, eg
 *      
 *        - user=Shish -- find all of Shish's posts
 *      
 *
- hash=md5sum, eg
 *      
 *        - hash=bf5b59173f16b6937a4021713dbfaa72 -- find the "Taiga want up!" image
 *      
 *
- filetype=type, eg
 *      
 *        - filetype=png -- find all PNG images
 *      
 *
- filename=blah, eg
 *      
 *        - filename=kitten -- find all images with "kitten" in the original filename
 *      
 *
- posted (=, <, >, <=, >=) date, eg
 *      
 *        - posted>=2009-12-25 posted<=2010-01-01 -- find images posted between christmas and new year
 *      
 *
*Search items can be combined to search for images which match both,
 *  or you can stick "-" in front of an item to search for things that don't
 *  match it.
 *  
Some search methods provided by extensions:
 *  
 *    - Danbooru API
 *      
 *        - md5:[hash] -- same as "hash=", but the API calls it by a different name
 *      
 *
- Numeric Score
 *      
 *        - score (=, <, >, <=, >=) number -- seach by score
 *        
- upvoted_by=Username -- search for a user's likes
 *        
- downvoted_by=Username -- search for a user's dislikes
 *      
 *
- Image Rating
 *      
 *        - rating=se -- find safe and explicit images, ignore questionable and unknown
 *      
 *
- Favorites
 *      
 *        - favorites (=, <, >, <=, >=) number -- search for images favourited a certain number of times
 *        
- favourited_by=Username -- search for a user's choices
 *      
 *
- Notes
 *      
 *        - notes (=, <, >, <=, >=) number -- search by the number of notes an image has
 *      
 *
*/
/*
 * SearchTermParseEvent:
 * Signal that a search term needs parsing
 */
class SearchTermParseEvent extends Event {
	var $term = null;
	var $context = null;
	var $querylets = array();
	public function SearchTermParseEvent($term, $context) {
		$this->term = $term;
		$this->context = $context;
	}
	public function is_querylet_set() {
		return (count($this->querylets) > 0);
	}
	public function get_querylets() {
		return $this->querylets;
	}
	public function add_querylet($q) {
		$this->querylets[] = $q;
	}
}
class SearchTermParseException extends SCoreException {
}
class PostListBuildingEvent extends Event {
	var $search_terms = null;
	public function __construct($search) {
		$this->search_terms = $search;
	}
}
class Index extends Extension {
	public function onInitExt(InitExtEvent $event) {
		global $config;
		$config->set_default_int("index_width", 3);
		$config->set_default_int("index_height", 4);
		$config->set_default_bool("index_tips", true);
	}
	public function onPageRequest(PageRequestEvent $event) {
		global $config, $database, $page, $user;
		if($event->page_matches("post/list")) {
			if(isset($_GET['search'])) {
				$search = url_escape(trim($_GET['search']));
				if(empty($search)) {
					$page->set_mode("redirect");
					$page->set_redirect(make_link("post/list/1"));
				}
				else {
					$page->set_mode("redirect");
					$page->set_redirect(make_link('post/list/'.$search.'/1'));
				}
				return;
			}
			$search_terms = $event->get_search_terms();
			$page_number = $event->get_page_number();
			$page_size = $event->get_page_size();
			try {
				$total_pages = Image::count_pages($search_terms);
				$images = Image::find_images(($page_number-1)*$page_size, $page_size, $search_terms);
			}
			catch(SearchTermParseException $stpe) {
				// FIXME: display the error somewhere
				$total_pages = 0;
				$images = array();
			}
			if(count($search_terms) == 0 && count($images) == 0 && $page_number == 1) {
				$this->theme->display_intro($page);
				send_event(new PostListBuildingEvent($search_terms));
			}
			else if(count($search_terms) > 0 && count($images) == 1 && $page_number == 1) {
				$page->set_mode("redirect");
				$page->set_redirect(make_link('post/view/'.$images[0]->id));
			}
			else {
				send_event(new PostListBuildingEvent($search_terms));
				$this->theme->set_page($page_number, $total_pages, $search_terms);
				$this->theme->display_page($page, $images);
			}
		}
	}
	public function onSetupBuilding(SetupBuildingEvent $event) {
		$sb = new SetupBlock("Index Options");
		$sb->position = 20;
		$sb->add_label("Index table size ");
		$sb->add_int_option("index_width");
		$sb->add_label(" x ");
		$sb->add_int_option("index_height");
		$sb->add_label(" images");
		$event->panel->add_block($sb);
	}
	public function onSearchTermParse(SearchTermParseEvent $event) {
		$matches = array();
		// check for tags first as tag based searches are more common.
		if(preg_match("/tags(<|>|<=|>=|=)(\d+)/", $event->term, $matches)) {
			$cmp = $matches[1];
			$tags = $matches[2];
			$event->add_querylet(new Querylet('images.id IN (SELECT DISTINCT image_id FROM image_tags GROUP BY image_id HAVING count(image_id) '.$cmp.' '.$tags.')'));
		}
		else if(preg_match("/^ratio(<|>|<=|>=|=)(\d+):(\d+)$/", $event->term, $matches)) {
			$cmp = $matches[1];
			$args = array("width"=>int_escape($matches[2]), "height"=>int_escape($matches[3]));
			$event->add_querylet(new Querylet('width / height '.$cmp.' :width / :height', $args));
		}
		else if(preg_match("/^(filesize|id)(<|>|<=|>=|=)(\d+[kmg]?b?)$/i", $event->term, $matches)) {
			$col = $matches[1];
			$cmp = $matches[2];
			$val = parse_shorthand_int($matches[3]);
			$event->add_querylet(new Querylet("images.$col $cmp :val", array("val"=>$val)));
		}
		else if(preg_match("/^(hash|md5)=([0-9a-fA-F]*)$/i", $event->term, $matches)) {
			$hash = strtolower($matches[2]);
			$event->add_querylet(new Querylet('images.hash = "'.$hash.'"'));
		}
		else if(preg_match("/^(filetype|ext)=([a-zA-Z0-9]*)$/i", $event->term, $matches)) {
			$ext = strtolower($matches[2]);
			$event->add_querylet(new Querylet('images.ext = "'.$ext.'"'));
		}
		else if(preg_match("/^(filename|name)=([a-zA-Z0-9]*)$/i", $event->term, $matches)) {
			$filename = strtolower($matches[2]);
			$event->add_querylet(new Querylet('images.filename LIKE "%'.$filename.'%"'));
		}
		else if(preg_match("/^posted(<|>|<=|>=|=)([0-9-]*)$/", $event->term, $matches)) {
			$cmp = $matches[1];
			$val = $matches[2];
			$event->add_querylet(new Querylet("images.posted $cmp :val", array("val"=>$val)));
		}
		else if(preg_match("/^size(<|>|<=|>=|=)(\d+)x(\d+)$/", $event->term, $matches)) {
			$cmp = $matches[1];
			$args = array("width"=>int_escape($matches[2]), "height"=>int_escape($matches[3]));
			$event->add_querylet(new Querylet('width '.$cmp.' :width AND height '.$cmp.' :height', $args));
		}
	}
}
?>