import { NavLink, Outlet } from 'react-router-dom'
import { useDarkMode } from './hooks/useDarkMode'
import { cn } from './utils/cn'

// Root layout: top navigation + dark-mode toggle; child routes render in <Outlet />.
export default function App() {
  const { isDark, toggleDarkMode } = useDarkMode()

  const navLinkClass = ({ isActive }: { isActive: boolean }) =>
    cn(
      'font-medium transition-colors',
      isActive
        ? 'text-primary-600 dark:text-primary-400'
        : 'text-gray-600 dark:text-gray-300 hover:text-gray-900 dark:hover:text-white'
    )

  return (
    <>
      <header className="border-b border-gray-200 dark:border-gray-800 bg-white dark:bg-gray-900 sticky top-0 z-10">
        <div className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 h-16 flex items-center justify-between">
          <div className="flex items-center gap-6">
            <h1 className="text-xl font-bold text-primary-600 dark:text-primary-400"><<project_name>></h1>
            <nav className="hidden md:flex gap-4">
              <NavLink to="/" end className={navLinkClass}>
                Home
              </NavLink>
              <NavLink to="/about" className={navLinkClass}>
                About
              </NavLink>
            </nav>
          </div>
          <button
            onClick={toggleDarkMode}
            className="p-2 rounded-lg bg-gray-100 dark:bg-gray-800 text-gray-500 dark:text-gray-400 hover:bg-gray-200 dark:hover:bg-gray-700 transition-colors"
            aria-label="Toggle dark mode"
          >
            {isDark ? (
              <svg
                xmlns="http://www.w3.org/2000/svg"
                className="h-5 w-5"
                viewBox="0 0 20 20"
                fill="currentColor"
              >
                <path
                  fillRule="evenodd"
                  d="M10 2a1 1 0 011 1v1a1 1 0 11-2 0V3a1 1 0 011-1zm4 8a4 4 0 11-8 0 4 4 0 018 0zm-.464 4.95l.707.707a1 1 0 001.414-1.414l-.707-.707a1 1 0 00-1.414 1.414zm2.12-10.607a1 1 0 010 1.414l-.706.707a1 1 0 11-1.414-1.414l.707-.707a1 1 0 011.414 0zM17 11a1 1 0 100-2h-1a1 1 0 100 2h1zm-7 4a1 1 0 011 1v1a1 1 0 11-2 0v-1a1 1 0 011-1zM5.05 6.464A1 1 0 106.465 5.05l-.708-.707a1 1 0 00-1.414 1.414l.707.707zm1.414 8.486l-.707.707a1 1 0 01-1.414-1.414l.707-.707a1 1 0 011.414 1.414zM4 11a1 1 0 100-2H3a1 1 0 000 2h1z"
                  clipRule="evenodd"
                />
              </svg>
            ) : (
              <svg
                xmlns="http://www.w3.org/2000/svg"
                className="h-5 w-5"
                viewBox="0 0 20 20"
                fill="currentColor"
              >
                <path d="M17.293 13.293A8 8 0 016.707 2.707a8.001 8.001 0 1010.586 10.586z" />
              </svg>
            )}
          </button>
        </div>
      </header>

      <main className="max-w-7xl mx-auto px-4 sm:px-6 lg:px-8 py-8 min-h-[calc(100vh-4rem)]">
        <Outlet />
      </main>
    </>
  )
}
