<?php

namespace App\Komma\Kms\Transfer;

/**
 * Class AbstractCsvImportExportService
 *
 * Used by both export and import services as a common base
 */
abstract class AbstractCsvTransferService
{
    protected const DELIMITER = ';';

    protected const HASHEADERROW = true;

    /**
     * Returns an array with column maps which map info to columns
     *
     * @return array
     */
    abstract protected function getColumnMaps(): array;

    protected function getHeaderNames(): array
    {
        $headerNames = collect($this->getColumnMaps())->flatten()->map(function (ColumnMap $columnMap) {
            return ['columnNumber' => $columnMap->getColumnNumber(), 'headerName' => $columnMap->getHeaderName()];
        })->sortBy('columnNumber')->map(function (array $numberHeaderArray) {
            return $numberHeaderArray['headerName'];
        })->toArray();

        if (! $headerNames) {
            return [];
        }

        return $headerNames;
    }
}