<?php

/**
 * Routine: burberry
 *
 * Purpose:
 * For each imported XLS row:
 * - read the value from column S
 * - read the value from column T
 * - merge the values
 * - save the final value into column S
 *
 * Target:
 * Column S must be mapped to the destination field in the template mapping.
 */

function applyRoutine(&$excelData, $routineData = [])
{
    /*
     * This routine does not require external routine data.
     * Columns are fixed.
     *
     * Excel column indexes are zero-based:
     *
     * S = 18
     * T = 19
     */
    $targetColumnIndex = 18; // S

    $columnSIndex = 18; // S
    $columnTIndex = 19; // T

    foreach ($excelData as $rowIndex => &$row) {
        if (!isset($row['data']) || !is_array($row['data'])) {
            error_log("Routine burberry: invalid row structure at index {$rowIndex}.");
            continue;
        }

        $valueS = trim((string)($row['data'][$columnSIndex] ?? ''));
        $valueT = trim((string)($row['data'][$columnTIndex] ?? ''));

        /*
         * Merge values, ignoring empty values.
         */
        $mergedValues = [];

        if ($valueS !== '') {
            $mergedValues[] = $valueS;
        }

        if ($valueT !== '') {
            $mergedValues[] = $valueT;
        }

        /*
         * Save final value into column S.
         */
        $row['data'][$targetColumnIndex] = implode(' ', $mergedValues);

        error_log(
            "Routine burberry: row " .
                ($row['excelrow'] ?? $rowIndex) .
                " generated value in column S: " .
                $row['data'][$targetColumnIndex]
        );
    }

    unset($row);

    error_log("Routine burberry completed.");
}