<?php
namespace Szurubooru\Upgrades;
use Szurubooru\DatabaseConnection;

class Upgrade30 implements IUpgrade
{
	public function run(DatabaseConnection $databaseConnection)
	{
		$pdo = $databaseConnection->getPDO();

		$pdo->exec('
			CREATE TABLE sequencer (
				tableName VARCHAR(32) NOT NULL,
				lastUsedId INT(11) NOT NULL DEFAULT 0
			)');

		$tables = [
			'favorites',
			'tags',
			'comments',
			'globals',
			'postNotes',
			'posts',
			'scores',
			'snapshots',
			'tags',
			'tokens',
			'users'];

		foreach ($tables as $table)
		{
			$this->removeAutoIncrement($pdo, $table);
			$this->createSequencer($pdo, $table);
		}
	}

	private function removeAutoIncrement($pdo, $table)
	{
		$pdo->exec('ALTER TABLE ' . $table . ' CHANGE id id INT(11) UNSIGNED NOT NULL');
	}

	private function createSequencer($pdo, $table)
	{
		$pdo->exec(sprintf('
			INSERT INTO sequencer (tableName, lastUsedId)
			VALUES (\'%s\', IFNULL((SELECT MAX(id) FROM %s), 0))', $table, $table));
	}
}