frontend/src/components/Navbar.tsx

import React from 'react';
import { Link, useLocation } from 'react-router-dom';
import { BarChart3, Search, Calendar, Map } from 'lucide-react';

const Navbar: React.FC = () => {
  const location = useLocation();

  return (
    <nav className="bg-white shadow-lg">
      <div className="container mx-auto px-4">
        <div className="flex justify-between h-16">
          <div className="flex items-center">
            <Link to="/" className="flex items-center space-x-2">
              <BarChart3 className="h-8 w-8 text-blue-600" />
              <span className="text-xl font-bold text-gray-900">Medical AI Wiki</span>
            </Link>
          </div>
          
          <div className="flex items-center space-x-4">
            <Link
              to="/"
              className={`flex items-center space-x-1 px-3 py-2 rounded-md text-sm font-medium ${
                location.pathname === '/' 
                  ? 'bg-blue-100 text-blue-700' 
                  : 'text-gray-500 hover:text-gray-700'
              }`}
            >
              <BarChart3 className="h-4 w-4" />
              <span>Dashboard</span>
            </Link>
            
            <Link
              to="/search"
              className={`flex items-center space-x-1 px-3 py-2 rounded-md text-sm font-medium ${
                location.pathname === '/search' 
                  ? 'bg-blue-100 text-blue-700' 
                  : 'text-gray-500 hover:text-gray-700'
              }`}
            >
              <Search className="h-4 w-4" />
              <span>Search</span>
            </Link>
            
            <Link
              to="/timeline"
              className={`flex items-center space-x-1 px-3 py-2 rounded-md text-sm font-medium ${
                location.pathname === '/timeline' 
                  ? 'bg-blue-100 text-blue-700' 
                  : 'text-gray-500 hover:text-gray-700'
              }`}
            >
              <Calendar className="h-4 w-4" />
              <span>Timeline</span>
            </Link>
            
            <Link
              to="/roadmap"
              className={`flex items-center space-x-1 px-3 py-2 rounded-md text-sm font-medium ${
                location.pathname === '/roadmap' 
                  ? 'bg-blue-100 text-blue-700' 
                  : 'text-gray-500 hover:text-gray-700'
              }`}
            >
              <Map className="h-4 w-4" />
              <span>Roadmap</span>
            </Link>
          </div>
        </div>
      </div>
    </nav>
  );
};

export default Navbar;