<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Magento\Framework\DB\Select;

use Magento\Framework\DB\Select;

/**
* Phrase renderer interface
*/
class SelectRenderer implements RendererInterface
{
private const MANDATORY_SELECT_PARTS = [
Select::COLUMNS => true,
Select::FROM => true
];

/**
* @var RendererInterface[]
*/
protected $renderers;

/**
* @param RendererInterface[] $renderers
*/
public function __construct(
array $renderers
) {
$this->renderers = $this->sort($renderers);
}

/**
* Sort renderers
*
* @param array $renders
* @return array
*/
protected function sort($renders)
{
$length = count($renders);
if ($length <= 1) {
return $renders;
} else {
$pivot = array_shift($renders);
$left = $right = [];
foreach ($renders as $render) {
if ($render['sort'] < $pivot['sort']) {
$left[] = $render;
} else {
$right[] = $render;
}
}

return array_merge(
$this->sort($left),
[$pivot],
$this->sort($right)
);
}
}

/**
* Render SELECT statement
*
* @param Select $select
* @param string $sql
* @return string
*/
public function render(Select $select, $sql = '')
{
$sql = Select::SQL_SELECT;
foreach ($this->renderers as $renderer) {
$part = $renderer['part'];
if (isset(self::MANDATORY_SELECT_PARTS[$part]) || $select->getPart($part)) {
$sql = $renderer['renderer']->render($select, $sql);
}
}
return $sql;
}
}