<?php

namespace Application\Migrations;

use Doctrine\DBAL\Migrations\AbstractMigration,

    Doctrine\DBAL\Schema\Schema,

	IRI\Bundle\WikiTagBundle\Utils\WikiTagUtils,

	IRI\Bundle\WikiTagBundle\Listener\DocumentListener;

/**

 * Migration for WikiTagBundle <= V00.13

 * This migration takes every tag label and search the REAL dbpedia uri associated to this label.

 * Before, the dbpedia uri was manually generated by http://dbpedia.org/resource/ + english_label.

 * Now we get the dbpedia uri by requesting http://LANG_CODE.dbpedia.org/sparql with the current label.

 * 

 */

class Version20140129151724 extends AbstractMigration

{

    public function up(Schema $schema)

    {

        // this up() migration is autogenerated, please modify it to your needs

        $this->abortIf($this->connection->getDatabasePlatform()->getName() != "mysql");

        // First we get all tags.

        $em = $GLOBALS["kernel"]->getContainer()->get( 'doctrine.orm.entity_manager' );

        // Avoid php annoying memory leaks

        $em->getConnection()->getConfiguration()->setSQLLogger(null);

        // remove event listener to avoid useless sql queries. Only WikiTag's Tags are modified

        $listenerInst = null;

        foreach ($em->getEventManager()->getListeners() as $event => $listeners) {

        	foreach ($listeners as $hash => $listener) {

        		if ($listener instanceof DocumentListener) {

        			$listenerInst = $listener;

        			break 2;

        		}

        	}

        }

        $listenerInst || die('Listener is not registered in the event manager');

        $evm = $em->getEventManager();

        $evm->removeEventListener(array('onFlush', 'preRemove', 'postPersist', 'postUpdate',  'postRemove'), $listenerInst);

        // First step : we populate the dbpedia uris thanks to the dbpedia-owl:wikiPageID

        // Second step : we populate the dbpedia uris not found thanks to the foaf:isPrimaryTopicOf

        echo "\nSECOND STEP";

        $query = $em->createQuery('SELECT t FROM WikiTagBundle:Tag t WHERE (t.wikipediaUrl!=\'\' AND t.wikipediaUrl IS NOT NULL AND (t.dbpediaUri=\'\' OR t.dbpediaUri IS NULL)) ORDER BY t.label ASC');//->setMaxResults(240);

        $tags = $query->getResult();

        $i = 1;

        $nb_set = 0;

        echo "\n".count($tags)." tags to search.";

        foreach($tags as $tag){

        	$l = $tag->getLabel();

        	$tag->setDbpediaUri($uri);

        	$em->persist($tag);

            if($uri!=NULL && $uri!=""){

                $nb_set++;

            }

        	if( $i % 50 == 0 ){

        		$em->flush();

        		echo "\n    FLUSH";

        	}

        	$i++;

        	echo "\n$i : $l \t\t: $uri";

        }

        $em->flush();

        echo "\nSECOND STEP : $nb_set uris found";

        // Third step : we populate the dbpedia uris not found thanks to the rdfs:label

        echo "\nTHIRD STEP";

        $query = $em->createQuery('SELECT t FROM WikiTagBundle:Tag t WHERE (t.wikipediaUrl!=\'\' AND t.wikipediaUrl IS NOT NULL AND (t.dbpediaUri=\'\' OR t.dbpediaUri IS NULL)) ORDER BY t.label ASC');//->setMaxResults(240);

        $tags = $query->getResult();

        $i = 1;

        $nb_set = 0;

        echo "\n".count($tags)." tags to search.";

        foreach($tags as $tag){

        	$l = $tag->getLabel();

        	$tag->setDbpediaUri($uri);

        	$em->persist($tag);

            if($uri!=NULL && $uri!=""){

                $nb_set++;

            }

        	if( $i % 50 == 0 ){

        		$em->flush();

        		echo "\n    FLUSH";

        	}

        	$i++;

        	echo "\n$i : $l \t\t: $uri";

        }

        $em->flush();

        echo "\nTHIRD STEP : $nb_set uris found";

    }

    public function down(Schema $schema)

    {

        // this down() migration is autogenerated, please modify it to your needs

        $this->abortIf($this->connection->getDatabasePlatform()->getName() != "mysql");

    }

}