<?php

namespace App\Support;

use App\Models\ServiceSslCertificate;
use Illuminate\Http\UploadedFile;
use InvalidArgumentException;
use ZipArchive;

class SslBundleExtractor
{
    private const MAX_TOTAL_BYTES = 2097152;

    public static function extract(UploadedFile $archive): array
    {
        $zip = new ZipArchive();
        if ($zip->open($archive->getRealPath(), ZipArchive::RDONLY) !== true) {
            throw new InvalidArgumentException('Không đọc được file zip.');
        }

        $files = [];
        $total = 0;

        for ($index = 0; $index < $zip->numFiles; $index++) {
            $name = self::cleanName($zip->getNameIndex($index));
            if ($name === null) {
                continue;
            }

            $content = $zip->getFromIndex($index, ServiceSslCertificate::MAX_FILE_BYTES + 1);
            if ($content === false || strlen($content) > ServiceSslCertificate::MAX_FILE_BYTES || ! self::isText($content)) {
                continue;
            }

            $total += strlen($content);
            if ($total > self::MAX_TOTAL_BYTES || count($files) >= ServiceSslCertificate::MAX_ENTRIES) {
                throw new InvalidArgumentException('File zip chứa quá nhiều dữ liệu.');
            }

            $files[$name] = ['name' => $name, 'content' => $content];
        }

        $zip->close();

        if ($files === []) {
            throw new InvalidArgumentException('File zip không có tệp văn bản nào (pem, crt, key, txt...).');
        }

        return array_values($files);
    }

    private static function cleanName(string $entry): ?string
    {
        if (str_ends_with($entry, '/') || str_contains($entry, '__MACOSX/')) {
            return null;
        }

        $name = trim(basename($entry));

        return $name === '' || str_starts_with($name, '.') ? null : mb_substr($name, 0, 150);
    }

    private static function isText(string $content): bool
    {
        return ! str_contains($content, "\0") && mb_check_encoding($content, 'UTF-8');
    }
}