<?php
/**
 * Zend Framework (http://framework.zend.com/)
 *
 * @link      http://github.com/zendframework/zf2 for the canonical source repository
 * @copyright Copyright (c) 2005-2015 Zend Technologies USA Inc. (http://www.zend.com)
 * @license   http://framework.zend.com/license/new-bsd New BSD License
 */

namespace Zend\Db\Sql\Platform\Oracle;

use Zend\Db\Adapter\Driver\DriverInterface;
use Zend\Db\Adapter\ParameterContainer;
use Zend\Db\Adapter\Platform\PlatformInterface;
use Zend\Db\Sql\Platform\PlatformDecoratorInterface;
use Zend\Db\Sql\Select;

class SelectDecorator extends Select implements PlatformDecoratorInterface
{
    /**
     * @var Select
     */
    protected $subject = null;

    /**
     * @param Select $select
     */
    public function setSubject($select)
    {
        $this->subject = $select;
    }

    /**
     * @see \Zend\Db\Sql\Select::renderTable
     */
    protected function renderTable($table, $alias = null)
    {
        return $table . ($alias ? ' ' . $alias : '');
    }

    protected function localizeVariables()
    {
        parent::localizeVariables();
        unset($this->specifications[self::LIMIT]);
        unset($this->specifications[self::OFFSET]);

        $this->specifications['LIMITOFFSET'] = null;
    }

    /**
     * @param PlatformInterface $platform
     * @param DriverInterface $driver
     * @param ParameterContainer $parameterContainer
     * @param $sqls
     * @param $parameters
     * @return null
     */
    protected function processLimitOffset(PlatformInterface $platform, DriverInterface $driver = null, ParameterContainer $parameterContainer = null, &$sqls, &$parameters)
    {
        if ($this->limit === null && $this->offset === null) {
            return;
        }

        $selectParameters = $parameters[self::SELECT];

        $starSuffix = $platform->getIdentifierSeparator() . self::SQL_STAR;
        foreach ($selectParameters[0] as $i => $columnParameters) {
            if ($columnParameters[0] == self::SQL_STAR || (isset($columnParameters[1]) && $columnParameters[1] == self::SQL_STAR) || strpos($columnParameters[0], $starSuffix)) {
                $selectParameters[0] = array(array(self::SQL_STAR));
                break;
            }
            if (isset($columnParameters[1])) {
                array_shift($columnParameters);
                $selectParameters[0][$i] = $columnParameters;
            }
        }

        if ($this->offset === null) {
            $this->offset = 0;
        }

        // first, produce column list without compound names (using the AS portion only)
        array_unshift($sqls, $this->createSqlFromSpecificationAndParameters(
            array('SELECT %1$s FROM (SELECT b.%1$s, rownum b_rownum FROM (' => current($this->specifications[self::SELECT])), $selectParameters
        ));

        if ($parameterContainer) {
            if ($this->limit === null) {
                array_push($sqls, ') b ) WHERE b_rownum > (:offset)');
                $parameterContainer->offsetSet('offset', $this->offset, $parameterContainer::TYPE_INTEGER);
            } else {
                // create bottom part of query, with offset and limit using row_number
                array_push($sqls, ') b WHERE rownum <= (:offset+:limit)) WHERE b_rownum >= (:offset + 1)');
                $parameterContainer->offsetSet('offset', $this->offset, $parameterContainer::TYPE_INTEGER);
                $parameterContainer->offsetSet('limit', $this->limit, $parameterContainer::TYPE_INTEGER);
            }
        } else {
            if ($this->limit === null) {
                array_push($sqls, ') b ) WHERE b_rownum > ('. (int) $this->offset. ')'
                );
            } else {
                array_push($sqls, ') b WHERE rownum <= ('
                        . (int) $this->offset
                        . '+'
                        . (int) $this->limit
                        . ')) WHERE b_rownum >= ('
                        . (int) $this->offset
                        . ' + 1)'
                );
            }
        }

        $sqls[self::SELECT] = $this->createSqlFromSpecificationAndParameters(
            $this->specifications[self::SELECT], $parameters[self::SELECT]
        );
    }
}
