DataDifferenceCalculator.php

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<?php
namespace Magento\Store\Model\Config\Importer;

use Magento\Framework\App\Config\ConfigSourceInterface;
use Magento\Store\Model\ScopeInterface;

class DataDifferenceCalculator
{
    private $runtimeConfigSource;

    public function __construct(ConfigSourceInterface $runtimeConfigSource)
    {
        $this->runtimeConfigSource = $runtimeConfigSource;
    }

    public function getItemsToDelete($scope, array $data)
    {
        $data = $this->changeDataKeyToCode($data);
        $runtimeScopeData = $this->changeDataKeyToCode(
            $this->getRuntimeData($scope)
        );

        return array_diff_key($runtimeScopeData, $data);
    }

    public function getItemsToCreate($scope, array $data)
    {
        $data = $this->changeDataKeyToCode($data);
        $runtimeScopeData = $this->changeDataKeyToCode(
            $this->getRuntimeData($scope)
        );

        return array_diff_key($data, $runtimeScopeData);
    }

    public function getItemsToUpdate($scope, array $data)
    {
        $itemsToUpdate = [];
        $data = $this->changeDataKeyToCode($data);
        $data = $this->setDefaultValues($scope, $data);
        $runtimeScopeData = $this->changeDataKeyToCode(
            $this->getRuntimeData($scope)
        );

        foreach ($runtimeScopeData as $entityCode => $entityData) {
            if (isset($data[$entityCode]) && array_diff_assoc($entityData, $data[$entityCode])) {
                $itemsToUpdate[$entityCode] = array_replace($entityData, $data[$entityCode]);
            }
        }

        return $itemsToUpdate;
    }

    private function setDefaultValues($scope, array $data)
    {
        $fieldset = [];
        switch ($scope) {
            case ScopeInterface::SCOPE_WEBSITES:
                $fieldset = ['default_group_id'];
                break;
            case ScopeInterface::SCOPE_GROUPS:
                $fieldset = ['website_id', 'default_store_id', 'root_category_id'];
                break;
            case ScopeInterface::SCOPE_STORES:
                $fieldset = ['website_id', 'group_id'];
                break;
        }

        foreach ($data as $entityCode => $entityData) {
            foreach ($fieldset as $field) {
                $entityData[$field] = !empty($entityData[$field]) ? $entityData[$field] : '0';
            }

            $data[$entityCode] = $entityData;
        }

        return $data;
    }

    private function getRuntimeData($scope)
    {
        $runtimeData = $this->runtimeConfigSource->get();

        return (array)$runtimeData[$scope];
    }

    private function changeDataKeyToCode(array $data)
    {
        return array_combine(
            array_column($data, 'code'),
            array_values($data)
        );
    }
}