middleware.ts

import { clerkMiddleware } from '@clerk/nextjs/server';
import { NextRequest, NextResponse } from 'next/server';
import { ClassValue, clsx } from 'clsx';
import { twMerge } from 'tailwind-merge';     

export const protocol =
  process.env.NODE_ENV === 'production' ? 'https' : 'http';
export const rootDomain =
  process.env.NEXT_PUBLIC_ROOT_DOMAIN || 'localhost:3000';

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs));
}

function extractSubdomain(request: NextRequest): string | null {
  const url = request.url;
  const host = request.headers.get('host') || '';
  const hostname = host.split(':')[0];

  // Local development environment
  if (url.includes('localhost') || url.includes('127.0.0.1')) {
    // Try to extract subdomain from the full URL
    const fullUrlMatch = url.match(/http:\/\/([^.]+)\.localhost/);
    if (fullUrlMatch && fullUrlMatch[1]) {
      return fullUrlMatch[1];
    }

    // Fallback to host header approach
    if (hostname.includes('.localhost')) {
      return hostname.split('.')[0];
    }

    return null;
  }

  // Production environment
  const rootDomainFormatted = rootDomain.split(':')[0];

  // Handle preview deployment URLs (tenant---branch-name.vercel.app)
  if (hostname.includes('---') && hostname.endsWith('.vercel.app')) {
    const parts = hostname.split('---');
    return parts.length > 0 ? parts[0] : null;
  }

  // Regular subdomain detection
  const isSubdomain =
    hostname !== rootDomainFormatted &&
    hostname !== `www.${rootDomainFormatted}` &&
    hostname.endsWith(`.${rootDomainFormatted}`);

  return isSubdomain ? hostname.replace(`.${rootDomainFormatted}`, '') : null;
}
export default clerkMiddleware((auth,request)=>{
  const { pathname } = request.nextUrl;
  const subdomain = extractSubdomain(request);
  if (subdomain) {
    return NextResponse.rewrite(new URL(`/s/${subdomain}`, request.url));
  }
});

export const config = {
  matcher: [
    // Skip Next.js internals and all static files, unless found in search params
    '/((?!_next|[^?]*\\.(?:html?|css|js(?!on)|jpe?g|webp|png|gif|svg|ttf|woff2?|ico|csv|docx?|xlsx?|zip|webmanifest)).*)',
    // Always run for API routes
    '/(api|trpc)(.*)',
  ],
};