<?php

namespace App\Http\Middleware;

use Closure;
use Illuminate\Http\Request;
use Symfony\Component\HttpFoundation\Response;

class SecurityHeadersMiddleware
{
    public function handle(Request $request, Closure $next): Response
    {
        $response = $next($request);

        // Server-Fingerprinting verhindern
        header_remove('X-Powered-By');
        $response->headers->remove('X-Powered-By');
        $response->headers->remove('Server');

        // Content Security Policy — erlaubt CDN-Quellen für Tailwind, Alpine, Quill, Leaflet
        // 'unsafe-inline' benötigt von: Tailwind CDN (inline Styles), Alpine.js (Event-Handler)
        // 'unsafe-eval' benötigt von: Tailwind CDN (JIT nutzt new Function())
        // Entfernung nur möglich durch Wechsel auf self-hosted/kompilierte Assets
        $cspDirectives = [
            "default-src 'self'",
            "script-src 'self' 'unsafe-inline' 'unsafe-eval' https://cdn.tailwindcss.com https://cdn.jsdelivr.net https://unpkg.com https://cdn.quilljs.com",
            "style-src 'self' 'unsafe-inline' https://cdn.tailwindcss.com https://cdn.jsdelivr.net https://unpkg.com https://cdn.quilljs.com",
            "img-src 'self' data: https://*.tile.openstreetmap.org https://unpkg.com",
            "font-src 'self' https://cdn.jsdelivr.net https://cdn.quilljs.com",
            "connect-src 'self' https://photon.komoot.io",
            "frame-src 'self'",
            "object-src 'none'",
            "base-uri 'self'",
            "form-action 'self'",
        ];

        // upgrade-insecure-requests nur bei HTTPS — bricht sonst lokale HTTP-Entwicklung (Herd/artisan serve)
        if ($request->secure()) {
            $cspDirectives[] = "upgrade-insecure-requests";
        }

        $csp = implode('; ', $cspDirectives);

        $response->headers->set('Content-Security-Policy', $csp);
        $response->headers->set('X-Content-Type-Options', 'nosniff');
        $response->headers->set('X-Frame-Options', 'SAMEORIGIN');
        $response->headers->set('X-XSS-Protection', '1; mode=block');
        $response->headers->set('Referrer-Policy', 'strict-origin-when-cross-origin');
        $response->headers->set('Permissions-Policy', 'camera=(), microphone=(), geolocation=(self), payment=(), usb=(), bluetooth=(), autoplay=(), magnetometer=(), gyroscope=(), accelerometer=()');

        // Cross-Origin Isolation Headers
        $response->headers->set('Cross-Origin-Opener-Policy', 'same-origin-allow-popups');

        // HSTS — HTTPS fuer 1 Jahr erzwingen (nur bei HTTPS-Requests aktiv)
        if ($request->secure()) {
            $response->headers->set('Strict-Transport-Security', 'max-age=31536000; includeSubDomains');
        }

        return $response;
    }
}