<?php

class LODrTagger { 
	//extends LODrObject {

	var $store;

	// Construct and access methods
	public function __construct(&$store, $graph = null, $url = null) {
		global $base;
		$this->store = $store;
		$this->graph = $graph;
		$this->url = $url;
	}
	
	function update_tagging($graph, $taggings) {
		global $secret;
		if($taggings['key'] != $secret) {
			echo "Wrong key, try again";
			die();
		}		
		foreach($taggings as $tagging => $moat) {				
			/// TODO - check pour gerer la cle differement
			/// TODO - remove unwanted taggings !!
			if(!is_array($moat)) continue;
			foreach($moat as $tag => $uris) {
				foreach($uris as $uri => $value) {
					$ok = null;
					if($uri == 'new' && $value) $ok = $value;
					if($uri != 'new' && $value == 'on') $ok = $uri;
					if($ok) {
						$msg[] = $this->moat_tagging($graph, $tagging, $tag, $ok);
						$this->autotag($tag);
					}
				}
			}
		}
		return $msg;
	}
		
	// Define the meaning of a tag in a particular tagging action
	function moat_tagging($graph, $tagging, $tag, $uri, $type = 'moat:ValidatedTagging') {
		$valid = true;
		// do not run the check test for automatic tagging, as it's already done in the past
		// since automatic tagging implies it was done at least manually
		if($type != 'moat:AutomatedTagging') {
			$valid = $this->check_uri($uri);
		}
		if($valid) {
			$meaning = "<$tagging> moat:tagMeaning <$uri> ; moat:taggingType $type .";
			$this->store->do_query("INSERT INTO <$graph> { $meaning }");
			LODrTools::moat_ping($graph);
			LODrTools::ping($graph);
		} else {
			return "Error: &lt;$uri&gt; does not seem to be a ressource URI";
		}
	}
	
	function check_uri($uri) {
		$urigraph = LODrTools::get_datagraph($uri);
		$this->store->do_query("LOAD <$uri> INTO <$urigraph> ");
		$res = $this->store->do_query("SELECT ?o WHERE { GRAPH <$urigraph> { <$uri> rdf:type ?o } }");
		if(count($res['result']['rows']) > 0) return true;
		else {
			$this->store->do_query("DELETE FROM <$urigraph>");
			return false;
		}		
	}
	
	/// Ici on taggue tout ! - action autotag = 1
	public function autotag($tag) {
		// 1) Get all possible meanings for this tag
		$query = "
		SELECT DISTINCT ?uri
		WHERE { 
			?tagging a tags:RestrictedTagging ;
				tags:taggedWithTag <$tag> ;
				moat:tagMeaning ?uri .
		}";
		$res = $this->store->do_query($query);
		foreach($res['result']['rows'] as $row) {
			$global[] = $row['uri'];
		}
		// 2) Get all the items with that tag that have not onlready been MOAT-ed
		$query = "
		SELECT DISTINCT ?graph ?tagging
		WHERE { 
			graph ?graph { 
				?tagging a tags:RestrictedTagging ;
					tags:taggedWithTag <$tag> .
			}
			OPTIONAL { ?tagging moat:tagMeaning ?uri } .
			FILTER (!bound(?uri))
		}";		
		$res = $this->store->do_query($query);
		foreach($res['result']['rows'] as $row) {
			$graph = $row['graph'];
			$tagging = $row['tagging'];
			if(sizeof($global) == 1) {
				$this->moat_tagging($graph, $tagging, $tag, $global[0], 'moat:AutomatedTagging');
			} else {
				if($autotag == 1) return;
				if($autotag == 2) {
					foreach($global as $uri) {
						$this->moat_tagging($graph, $tagging, $tag, $uri, 'moat:AutomatedTagging');
					}
				}
			}
		}
	}
	
}

?>