<?php
/* $Id$ */
namespace Mammut\DB\Sql;

(defined('MAMMUT') && (basename(__FILE__) != basename($_SERVER['PHP_SELF']))) or die('ACCESS DENIED');

use Mammut\DB\Sql\Dialect\iDialect;
use Mammut\DB\Sql\Elements\Table;
use Mammut\DB\Sql\Elements\Where;

/**
 * Update query
 *
 * @author Stefan Daurer <s.daurer@q-spot.org>
 * @package Mammut\DB\Sql
 */
class Update extends Query {
	use Selective;
	use Targetable;
	use Limitable;
	use Orderable;

//    const VALUES_MERGE = 'merge';
	const VALUES_SET = 'set';

	/**
	 * Constructor
	 *
	 * @param null|string|Table $table        	
	 */
	public function __construct($table = null) {
		if($table)
			$this->from($table);
		$this->where = new Where();
	}

	/**
	 * Set key/value pairs to update
	 *
	 * @param array $values
	 *        	Associative array of key values
	 * @param string $flag
	 *        	One of the VALUES_* constants
	 * @throws \InvalidArgumentException
	 * @return $this
	 */
	public function set(array $values) {
		if(empty($values))
			throw new \InvalidArgumentException('set() expects an array of values');
		
		$this->setup[self::VALUES_SET] = $values;
		
		return $this;
	}

	public function getSql(iDialect $dialect = null) {
		$dialect = $dialect ? $dialect : new \Mammut\DB\Sql\Dialect\Sql92();
		$sql = $dialect->getUpdateSQL($this->setup);
		return $sql;
	}
}