<?php

namespace App\Http\Middleware;

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

class SecurityHeaders
{
    /**
     * Handle an incoming request.
     *
     * @param  Closure(Request): (Response)  $next
     */
    public function handle(Request $request, Closure $next): Response
    {
        $response = $next($request);

        // 🛡️ SECURITY HEADERS

        // Prevent Clickjacking
        $response->headers->set('X-Frame-Options', 'SAMEORIGIN');

        // Prevent Mime-Type Sniffing
        $response->headers->set('X-Content-Type-Options', 'nosniff');

        // Cross-Site Scripting (XSS) Protection (for older browsers)
        $response->headers->set('X-XSS-Protection', '1; mode=block');

        // Referrer Policy
        $response->headers->set('Referrer-Policy', 'strict-origin-when-cross-origin');

        // Permissions Policy
        $response->headers->set('Permissions-Policy', 'camera=(), microphone=(), geolocation=()');

        // Content Security Policy — enforced (current CDN stack requires unsafe-inline/eval)
        $cdnSources = 'https://cdn.jsdelivr.net https://cdnjs.cloudflare.com https://cdn.datatables.net https://cdn.ckeditor.com https://unpkg.com https://code.jquery.com https://www.google.com https://www.gstatic.com';
        $csp = implode('; ', [
            "default-src 'self'",
            "script-src 'self' 'unsafe-inline' 'unsafe-eval' {$cdnSources}",
            "style-src 'self' 'unsafe-inline' https://cdn.jsdelivr.net https://cdnjs.cloudflare.com https://cdn.datatables.net https://unpkg.com https://fonts.googleapis.com",
            "font-src 'self' https://cdn.jsdelivr.net https://fonts.gstatic.com https://cdnjs.cloudflare.com",
            "img-src 'self' data: blob: https:",
            "connect-src 'self' https://o*.ingest.sentry.io wss:",
            "frame-src 'self' https://www.google.com",
            "object-src 'none'",
            "base-uri 'self'",
            "form-action 'self'",
        ]);
        $response->headers->set('Content-Security-Policy', $csp);

        // Report-Only: stricter policy (no unsafe-inline/eval) — violations logged in browser
        // console without blocking users. Use this to audit inline scripts before tightening
        // the enforced policy above.
        $cspReportOnly = implode('; ', [
            "default-src 'self'",
            "script-src 'self' {$cdnSources}",
            "style-src 'self' https://cdn.jsdelivr.net https://cdnjs.cloudflare.com https://cdn.datatables.net https://unpkg.com https://fonts.googleapis.com",
            "font-src 'self' https://cdn.jsdelivr.net https://fonts.gstatic.com https://cdnjs.cloudflare.com",
            "img-src 'self' data: blob: https:",
            "connect-src 'self' https://o*.ingest.sentry.io wss:",
            "frame-src 'self' https://www.google.com",
            "object-src 'none'",
            "base-uri 'self'",
            "form-action 'self'",
        ]);
        $response->headers->set('Content-Security-Policy-Report-Only', $cspReportOnly);

        // Strict-Transport-Security (Only if HTTPS)
        if ($request->isSecure()) {
            $response->headers->set('Strict-Transport-Security', 'max-age=31536000; includeSubDomains');
        }

        return $response;
    }
}