import { NextResponse } from 'next/server';
import type { NextRequest } from 'next/server';
import { auth } from './lib/auth';

// Paths that don't require authentication
const publicPaths = ['/api/auth', '/api/health', '/login', '/favicon.ico'];

// Skip authentication for local development
const skipAuth = process.env.NEXT_PUBLIC_SKIP_AUTH === 'true';

export default async function proxy(request: NextRequest) {
  const { pathname } = request.nextUrl;

  // Skip authentication check for public paths
  if (publicPaths.some((path) => pathname.startsWith(path))) {
    return NextResponse.next();
  }

  // Skip authentication entirely in dev mode
  if (skipAuth) {
    const response = NextResponse.next();
    response.headers.set('x-user-id', 'mock-user-id');
    response.headers.set('x-user-email', 'dev@localhost');
    return response;
  }

  // Check session
  const session = await auth.api.getSession({
    headers: request.headers,
  });

  // If no session, redirect to login
  if (!session) {
    // Redirect to login page (not directly to Microsoft)
    const loginUrl = new URL('/login', request.url);
    loginUrl.searchParams.set('callbackUrl', pathname);
    return NextResponse.redirect(loginUrl);
  }

  // Add user information to headers (optional)
  const response = NextResponse.next();
  response.headers.set('x-user-id', session.user.id);
  response.headers.set('x-user-email', session.user.email || '');

  return response;
}

// Configuration - which paths the middleware should run on
export const config = {
  matcher: [
    /*
     * Match all request paths except:
     * - _next/static (static files)
     * - _next/image (image optimization files)
     * - favicon.ico (favicon file)
     * - public folder
     */
    '/((?!_next/static|_next/image|favicon.ico|public).*)',
  ],
};