SearchTermManager.php

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<?php
namespace Magento\Setup\Model;

class SearchTermManager
{
    private $searchTerms;

    private $searchTermsUseRate;

    private $totalProductsCount;

    public function __construct(array $searchTerms, $totalProductsCount)
    {
        $this->searchTerms = $searchTerms;
        $this->totalProductsCount = (int) $totalProductsCount;
    }

    public function applySearchTermsToDescription(&$description, $currentProductIndex)
    {
        if ($this->searchTermsUseRate === null) {
            $this->calculateSearchTermsUseRate();
        }

        foreach ($this->searchTerms as &$searchTerm) {
            if ($this->searchTermsUseRate[$searchTerm['term']]['use_rate'] > 0
                && $currentProductIndex % $this->searchTermsUseRate[$searchTerm['term']]['use_rate'] === 0
                && $this->searchTermsUseRate[$searchTerm['term']]['used'] < $searchTerm['count']
            ) {
                $description .= ' ' . $searchTerm['term'];
                $this->searchTermsUseRate[$searchTerm['term']]['used'] += 1;
            }
        }
    }

    private function calculateSearchTermsUseRate()
    {
        foreach ($this->searchTerms as $searchTerm) {
            $this->searchTermsUseRate[$searchTerm['term']] = [
                'use_rate' => floor($this->totalProductsCount / $searchTerm['count']),
                'used' => 0
            ];
        }
    }
}