<?php

class Qs_Validate_UniqueMultiple extends Qs_Validate_Unique
{
    protected $_columns;

    public function __construct(Qs_Db_TAble $table, array $columns, $current = null, array $options = array())
    {
        $this->_table = $table;
        $this->_columns = $columns;
        $this->_current = $current;
        if (is_array($options) && !empty($options)) {
            $this->setOptions($options);
        }
    }

    public function isValid($value, $context = null)
    {
        $value = (string) $value;
        $this->_setValue($value);
        $db = $this->_table->getAdapter();
        $where = $this->getWhere();
        foreach ($this->_columns as $column) {
            $where[] = $db->quoteInto($column . ' = ?', $context[$column]);
        }
        if (isset($this->_current)) {
            $current = (array) $this->_current;
            $info = $this->_table->info();
            foreach ($info['primary'] as $key => $column) {
                $where[] = $db->quoteInto($column . ' <> ?', $current[$key - 1]);
            }
        }
        $rowset = $this->_table->fetchAll($where);
        if ($rowset->count()) {
            $this->_error(self::NOT_UNIQUE);
            return false;
        }
        return true;
    }
}