<?php

namespace App\Exports;

use Symfony\Component\HttpFoundation\StreamedResponse;

class CsvExport
{
    /**
     * @param array<int, string> $headers
     * @param array<int, array<int, mixed>> $rows
     */
    public static function download(string $filename, array $headers, array $rows): StreamedResponse
    {
        return response()->streamDownload(function () use ($headers, $rows): void {
            $handle = fopen('php://output', 'wb');

            if ($handle === false) {
                return;
            }

            // UTF-8 BOM improves Russian text rendering in Excel.
            fwrite($handle, "\xEF\xBB\xBF");

            fputcsv($handle, self::normalizeRow($headers), ';');

            foreach ($rows as $row) {
                fputcsv($handle, self::normalizeRow($row), ';');
            }

            fclose($handle);
        }, $filename, [
            'Content-Type' => 'text/csv; charset=UTF-8',
        ]);
    }

    /**
     * @param array<int, mixed> $row
     * @return array<int, mixed>
     */
    private static function normalizeRow(array $row): array
    {
        return array_map(static function (mixed $value): mixed {
            if ($value === null) {
                return '';
            }

            if (is_string($value)) {
                return str_replace(["\r\n", "\r"], "\n", $value);
            }

            if (is_bool($value)) {
                return $value ? '1' : '0';
            }

            return $value;
        }, $row);
    }
}