<?php
/**
* @copyright: Copyright © 2021 Firebear Studio. All rights reserved.
* @author: Firebear Studio <fbeardev@gmail.com>
*/
namespace Firebear\ImportExport\Model\Job\Strategy;

use Magento\Framework\Exception\LocalizedException;

/**
* @api
*/
class StrategyPool implements StrategyPoolInterface
{
/**
* @var mixed[]
*/
protected $strategies = [];

/**
* @var StrategyInterface[]
*/
protected $strategiesInstances = [];

/**
* @var StrategyFactory
*/
protected $factory;

/**
* @param StrategyFactory $factory
* @param mixed[] $strategies
*/
public function __construct(
StrategyFactory $factory,
array $strategies = []
) {
$this->factory = $factory;
$this->strategies = $this->sort($strategies);
}

/**
* Retrieve strategies
*
* @return mixed[]
*/
public function getStrategies()
{
return $this->strategies;
}

/**
* Retrieve strategies instantiated
*
* @return StrategyInterface[]
* @throws LocalizedException
*/
public function getStrategiesInstances()
{
if ($this->strategiesInstances) {
return $this->strategiesInstances;
}

foreach ($this->strategies as $strategy) {
if (empty($strategy['class'])) {
throw new LocalizedException(__('The parameter "class" is missing. Set the "class" and try again.'));
}

if (empty($strategy['sortOrder'])) {
throw new LocalizedException(
__('The parameter "sortOrder" is missing. Set the "sortOrder" and try again.')
);
}

$this->strategiesInstances[] = $this->factory->create($strategy['class']);
}

return $this->strategiesInstances;
}

/**
* Sorting strategies according to sort order
*
* @param mixed[] $data
* @return mixed[]
*/
protected function sort(array $data)
{
usort($data, function (array $a, array $b) {
return $this->getSortOrder($a) <=> $this->getSortOrder($b);
});

return $data;
}

/**
* Retrieve sort order from array
*
* @param mixed[] $variable
* @return int
*/
protected function getSortOrder(array $variable)
{
return !empty($variable['sortOrder']) ? $variable['sortOrder'] : 0;
}
}