<?php

declare(strict_types=1);

namespace App\Service;

use League\Flysystem\FilesystemException;
use League\Flysystem\FilesystemOperator;

/**
 * Provides access to XML dumps of BusProNet API communication.
 *
 * XML dumps are stored in the filesystem and named with a pattern that includes
 * the request ID, sequence number, and type (request/response). This service
 * allows finding and reading dumps by request ID.
 */
class XmlDumpReader
{
    public function __construct(
        private readonly FilesystemOperator $xmlDump,
    ) {
    }

    /**
     * Finds all XML dump files matching the given request ID.
     *
     * Supports both exact matches (e.g., "abc123_1") and base ID matches (e.g., "abc123")
     * which will return all files with counter suffixes for both request and response types.
     *
     * @return array<int, array{filename: string, type: string, size: int}>
     *
     * @throws FilesystemException
     */
    public function findDumpsForRequestId(string $requestId): array
    {
        if ('' === $requestId || '-' === $requestId) {
            return [];
        }

        $pattern = '/^'.preg_quote($requestId, '/').'(_\d+)?_(request|response)\.xml$/';
        $matches = [];

        foreach ($this->xmlDump->listContents('.') as $item) {
            if ($item->isFile() && 1 === preg_match($pattern, $item->path(), $typeMatch)) {
                $matches[] = [
                    'filename' => $item->path(),
                    'type' => $typeMatch[2],
                    'size' => $this->xmlDump->fileSize($item->path()),
                ];
            }
        }

        usort($matches, static fn (array $a, array $b): int => strcmp($a['filename'], $b['filename']));

        return $matches;
    }

    /**
     * Reads the content of a dump file.
     *
     * @throws FilesystemException
     */
    public function getContent(string $filename): string
    {
        return $this->xmlDump->read($filename);
    }

    /**
     * Checks if a dump file exists.
     *
     * @throws FilesystemException
     */
    public function fileExists(string $filename): bool
    {
        return $this->xmlDump->fileExists($filename);
    }
}