<?php

namespace App\EventSubscriber;

use App\Ops\Installation;
use App\Ops\Protection;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\RedirectResponse;
use Symfony\Component\HttpKernel\Event\RequestEvent;
use Symfony\Component\HttpKernel\KernelEvents;

/**
 * An installation that does not exist yet answers with the installer instead of an error.
 *
 * Without this, the first visit to a freshly unpacked website is a 500 from a missing table - the
 * one moment where a person needs a sentence, not a stack trace.
 *
 * The cost of knowing is kept at zero for a running website: once an account exists, a marker file
 * is written and no request asks the database again. The marker only ever silences this
 * subscriber; the installer itself always asks the database, so deleting the file does not reopen
 * anything.
 */
final class InstallSubscriber implements EventSubscriberInterface
{
    public const MARKER = 'var/installed';

    public function __construct(private Installation $installation, private string $projectDir)
    {
    }

    public static function getSubscribedEvents(): array
    {
        // After maintenance (40), before the router: an unfinished installation has no routes
        // worth matching except its own.
        return [KernelEvents::REQUEST => ['onRequest', 36]];
    }

    public function onRequest(RequestEvent $event): void
    {
        // Fehlende Sperrdateien nachtragen (var/, vendor/, Projektstamm) - einmal je Prozess.
        Protection::ensure($this->projectDir);
        if (!$event->isMainRequest() || is_file($this->projectDir.'/'.self::MARKER)) {
            return;
        }
        if ($this->installation->isInstalled()) {
            @file_put_contents($this->projectDir.'/'.self::MARKER, gmdate('c')."\n");

            return;
        }
        $path = $event->getRequest()->getPathInfo();
        if (str_starts_with($path, '/install') || preg_match('#^/(assets/|favicon)#', $path)) {
            return;
        }
        $event->setResponse(new RedirectResponse('/install'));
    }
}