<?php

namespace Application\Migrations;

use Doctrine\Migrations\AbstractMigration;
use Doctrine\DBAL\Schema\Schema;
use Chill\MainBundle\Entity\Center;

/**
 * Add a center to class person
 */
class Version20150607231010 extends AbstractMigration
{
    public function getDescription(): string
    {
        return 'Add a center on the person entity. The default center is the first '
        . 'recorded.';
    }


    /**
     * @param Schema $schema
     */
    public function up(Schema $schema): void
    {
        $this->abortIf(
            $this->connection->getDatabasePlatform()->getName() != 'postgresql',
            'Migration can only be executed safely on \'postgresql\'.'
        );

        // retrieve center for setting a default center
        $centers = $this->connection->fetchAll('SELECT id FROM centers');

        if (count($centers) > 0) {
            $defaultCenterId = $centers[0]['id'];
        } else { // if no center, performs other checks
            //check if there are data in person table
            $nbPeople = $this->connection->fetchColumn('SELECT count(*) FROM person');

            if ($nbPeople > 0) {
                // we have data ! We have to create a center !
                $newCenterId = $this->connection->fetchColumn('SELECT nextval(\'centers_id_seq\');');
                $this->addSql(
                    'INSERT INTO centers (id, name) VALUES (:id, :name)',
                    ['id' => $newCenterId, 'name' => 'Auto-created center']
                );
                $defaultCenterId = $newCenterId;
            }
        }

        $this->addSql('ALTER TABLE person ADD center_id INT');

        if (isset($defaultCenterId)) {
            $this->addSql('UPDATE person SET center_id = :id', array('id' => $defaultCenterId));
        }

        $this->addSql('ALTER TABLE person '
                . 'ADD CONSTRAINT FK_person_center FOREIGN KEY (center_id) '
                . 'REFERENCES centers (id) NOT DEFERRABLE INITIALLY IMMEDIATE');
        $this->addSql('ALTER TABLE person ALTER center_id SET NOT NULL');
        $this->addSql('CREATE INDEX IDX_person_center ON person (center_id)');
    }

    /**
     * @param Schema $schema
     */
    public function down(Schema $schema): void
    {
        $this->abortIf(
            $this->connection->getDatabasePlatform()->getName() != 'postgresql',
            'Migration can only be executed safely on \'postgresql\'.'
        );

        $this->addSql('ALTER TABLE Person DROP CONSTRAINT FK_person_center');
        $this->addSql('DROP INDEX IDX_person_center');
        $this->addSql('ALTER TABLE Person DROP center_id');
    }
}