import { useState } from 'react';
import { Link } from 'react-router-dom';

export default function Navbar() {
  const [isMenuOpen, setIsMenuOpen] = useState(false);

  return (
    <nav className="bg-gray-900 text-white shadow-lg">
      <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8">
        <div className="flex items-center justify-between h-16">
          <div className="flex items-center">
            <div className="flex-shrink-0">
              <Link to="/" className="flex items-center">
                <img 
                  className="h-8 w-8 mr-2" 
                  src="/roblox-logo.png" 
                  alt="Roblox Logo" 
                />
                <span className="text-xl font-bold bg-gradient-to-r from-blue-400 to-purple-500 bg-clip-text text-transparent">
                  Roblox 基礎入門
                </span>
              </Link>
            </div>
          </div>
          
          {/* Desktop menu */}
          <div className="hidden md:block">
            <div className="ml-10 flex items-baseline space-x-4">
              <Link to="/" className="px-3 py-2 rounded-md text-sm font-medium hover:bg-gray-800 hover:text-white">
                首頁
              </Link>
              <Link to="/lesson1" className="px-3 py-2 rounded-md text-sm font-medium hover:bg-gray-800 hover:text-white">
                第一課：基礎入門
              </Link>
              <Link to="/lesson2" className="px-3 py-2 rounded-md text-sm font-medium hover:bg-gray-800 hover:text-white">
                第二課：賽車遊戲
              </Link>
              <Link to="/lesson3" className="px-3 py-2 rounded-md text-sm font-medium hover:bg-gray-800 hover:text-white">
                第三課：互動機關
              </Link>
              <Link to="/lesson4" className="px-3 py-2 rounded-md text-sm font-medium hover:bg-gray-800 hover:text-white">
                第四課：視覺化設計
              </Link>
            </div>
          </div>
          
          {/* Mobile menu button */}
          <div className="md:hidden flex items-center">
            <button
              onClick={() => setIsMenuOpen(!isMenuOpen)}
              className="inline-flex items-center justify-center p-2 rounded-md text-gray-400 hover:text-white hover:bg-gray-700 focus:outline-none focus:ring-2 focus:ring-inset focus:ring-white"
            >
              <span className="sr-only">Open main menu</span>
              {isMenuOpen ? (
                <svg className="block h-6 w-6" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" aria-hidden="true">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2" d="M6 18L18 6M6 6l12 12" />
                </svg>
              ) : (
                <svg className="block h-6 w-6" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke="currentColor" aria-hidden="true">
                  <path strokeLinecap="round" strokeLinejoin="round" strokeWidth="2" d="M4 6h16M4 12h16M4 18h16" />
                </svg>
              )}
            </button>
          </div>
        </div>
      </div>

      {/* Mobile menu */}
      {isMenuOpen && (
        <div className="md:hidden">
          <div className="px-2 pt-2 pb-3 space-y-1 sm:px-3">
            <Link 
              to="/" 
              className="block px-3 py-2 rounded-md text-base font-medium hover:bg-gray-800 hover:text-white"
              onClick={() => setIsMenuOpen(false)}
            >
              首頁
            </Link>
            <Link 
              to="/lesson1" 
              className="block px-3 py-2 rounded-md text-base font-medium hover:bg-gray-800 hover:text-white"
              onClick={() => setIsMenuOpen(false)}
            >
              第一課：基礎入門
            </Link>
            <Link 
              to="/lesson2" 
              className="block px-3 py-2 rounded-md text-base font-medium hover:bg-gray-800 hover:text-white"
              onClick={() => setIsMenuOpen(false)}
            >
              第二課：賽車遊戲
            </Link>
            <Link 
              to="/lesson3" 
              className="block px-3 py-2 rounded-md text-base font-medium hover:bg-gray-800 hover:text-white"
              onClick={() => setIsMenuOpen(false)}
            >
              第三課：互動機關
            </Link>
            <Link 
              to="/lesson4" 
              className="block px-3 py-2 rounded-md text-base font-medium hover:bg-gray-800 hover:text-white"
              onClick={() => setIsMenuOpen(false)}
            >
              第四課：視覺化設計
            </Link>
          </div>
        </div>
      )}
    </nav>
  );
}