<?php

declare(strict_types=1);

namespace LinkCheckup\Features\LinkLists;

use LinkCheckup\Shared\Links\Link;
use LinkCheckup\Shared\Links\LinkKind;

use function in_array;

final class ArchiveAddress {

	private const ARCHIVE_PREFIX  = 'https://web.archive.org/web/';
	private const FILE_EXTENSIONS = array(
		'pdf',
		'zip',
		'doc',
		'docx',
		'xls',
		'xlsx',
		'ppt',
		'pptx',
		'csv',
		'txt',
		'mp3',
		'mp4',
		'epub',
	);

	public function archived_copy_of( Link $link ): string|null {
		if ( LinkKind::Link !== $link->kind ) {
			return null;
		}

		if ( $this->looks_like_file( $link->url ) ) {
			return null;
		}

		return self::ARCHIVE_PREFIX . $link->url;
	}

	private function looks_like_file( string $url ): bool {
		$path      = (string) wp_parse_url( $url, PHP_URL_PATH );
		$extension = strtolower( pathinfo( $path, PATHINFO_EXTENSION ) );

		return in_array( $extension, self::FILE_EXTENSIONS, true );
	}
}