<?php

namespace App\Helpers;

use PhpOffice\PhpSpreadsheet\Shared\StringHelper;

class ExcelSanitizeHelper
{
    /**
     * Regex pattern for non-printable characters to be removed from strings.
     * 
     * This pattern includes control characters, zero-width characters, and Excel-specific codes
     */
    private static $nonPrintablePattern = '/[\x00-\x1F\x7F\x{200B}\x{200C}]|_x[0-9A-F]{4}_/u';

    /**
     * Sanitizes array data by removing non-printable characters and trimming whitespace from strings.
     *
     * @param array $data Input array containing data to sanitize
     * @return array Sanitized array with non-printable characters removed and leading/trailing whitespace trimmed
     */
    public static function sanitizeArrayData(array $data): array
    {
        try {
            $cleanData = [];

            foreach ($data as $key => $value) {
                if (is_array($value)) {
                    $cleanData[$key] = self::sanitizeArrayData($value); // Recursive call for nested arrays
                } elseif (is_string($value)) {
                    // Remove non-printable characters and trim whitespace from strings
                    $value = str_replace("\u00a0", " ", $value);
                    $cleanData[$key] = trim(preg_replace(self::$nonPrintablePattern, '', $value));
                } else {
                    $cleanData[$key] = $value; // Keep non-string/non-array data as is
                }
            }
            return $cleanData;
        } catch (\Exception $e) {
            // Log the error and the problematic data for debugging
            log_message('error', 'Error sanitizing array data: ' . $e->getMessage());
            log_message('error', 'Problematic data: ' . json_encode($data));
            return $data; // Return the original data in case of error
        }
    }
}