<?php

declare(strict_types=1);

namespace Qbil\ApplicationManagement\Controller;

use Qbil\CommonBundle\Extension\MonospaceResponse;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;

/**
 * @Route("/log/{filename}/{lines}/{skip}", defaults={"lines"=100, "skip"=0}, methods={"GET"})
 */
class ReadLogs
{
    private string $logsDir;

    public function __construct(string $logsDir)
    {
        $this->logsDir = $logsDir;
    }

    public function __invoke(string $filename, int $lines, int $skip): Response
    {
        if (!\is_file($logfile = "{$this->logsDir}/{$filename}.log")) {
            return new MonospaceResponse([
                "Log file for '{$filename}' not found.",
            ]);
        }

        $file = new \SplFileObject($logfile, 'rb');
        $file->seek(\PHP_INT_MAX);
        $totalLines = $file->key();
        $limit = $skip > 0 && $lines > $skip ? $lines - $skip : -1;

        $reader = new \LimitIterator($file, ($offset = $totalLines - $lines) >= 0 ? $offset : 0, $limit);

        return new MonospaceResponse($reader);
    }
}