<?php
/**
 * Copyright 2021 Adobe
 * All Rights Reserved.
 */

namespace Magento\QueryXml\Model\Config;

use DOMDocument;
use Magento\Framework\Config\ConverterInterface;

/**
 * A converter of reports configuration.
 *
 * Converts configuration data stored in XML format into corresponding PHP array.
 */
class Converter implements ConverterInterface
{
    /**
     * @var ConverterInterface
     */
    private $baseConverter;

    /**
     * @param ConverterInterface $converter
     */
    public function __construct(ConverterInterface $converter)
    {
        $this->baseConverter = $converter;
    }

    /**
     * Builds map of source aliases to source names for given query.
     *
     * @param array $queryData
     * @return array
     */
    private function buildSourcesMap(array $queryData) : array
    {
        $output = [];
        $alias = $queryData['alias'] ?? $queryData['name'];
        $output[$alias] = $queryData['name'];
        if (isset($queryData['link-source'])) {
            foreach ($queryData['link-source'] as $linkedSource) {
                $alias = $linkedSource['alias'] ?? $linkedSource['name'];
                $output[$alias] = $linkedSource['name'];
            }
        }
        return $output;
    }
    /**
     * Converts XML document into corresponding array.
     *
     * @param DOMDocument $source
     * @return array
     */
    public function convert($source)
    {
        $configData = $this->baseConverter->convert($source);
        if (!isset($configData['config'][0]['query'])) {
            return [];
        }
        $queries = [];
        foreach ($configData['config'][0]['query'] as $queryData) {
            $entityData = array_shift($queryData['source']);
            $queries[$queryData['name']] = $queryData;
            $queries[$queryData['name']]['source'] = $entityData;
            $queries[$queryData['name']]['map'] = $this->buildSourcesMap($entityData);
        }
        return $queries;
    }
}