"use client";
import Link from "next/link";
import { useState } from "react";
import { useAuth } from "@/lib/auth";

export default function Navbar() {
  const [open, setOpen] = useState(false);
  const { user, isLoggedIn, logout } = useAuth();

  return (
    <nav className="border-b border-slate-200 bg-white sticky top-0 z-50 shadow-sm">
      <div className="max-w-6xl mx-auto px-4 h-14 flex items-center">
        <Link href="/" className="font-bold text-blue-600 tracking-tight text-lg shrink-0">
          ⚡ Arbitrage Engine
        </Link>

        {/* Desktop nav */}
        <div className="hidden md:flex items-center gap-6 text-sm ml-8">
          <Link href="/" className="text-slate-600 hover:text-blue-600 transition-colors">仪表盘</Link>
          <Link href="/about" className="text-slate-600 hover:text-blue-600 transition-colors">说明</Link>
        </div>
        <div className="hidden md:flex items-center gap-3 text-sm ml-auto">
          {isLoggedIn ? (
            <>
              <span className="text-slate-500 text-xs">{user?.email}</span>
              {user?.role === "admin" && (
                <span className="bg-amber-100 text-amber-700 text-xs px-2 py-0.5 rounded-full font-medium">Admin</span>
              )}
              <button onClick={logout} className="text-slate-500 hover:text-red-500 transition-colors">退出</button>
            </>
          ) : (
            <>
              <Link href="/login" className="text-slate-500 hover:text-slate-800 transition-colors">登录</Link>
              <Link href="/register" className="bg-blue-600 hover:bg-blue-700 text-white px-3 py-1.5 rounded-lg transition-colors">注册</Link>
            </>
          )}
        </div>

        {/* Mobile */}
        <div className="md:hidden ml-auto flex items-center gap-2">
          {isLoggedIn ? (
            <button onClick={logout} className="text-slate-500 text-sm">退出</button>
          ) : (
            <>
              <Link href="/login" className="text-slate-500 text-sm">登录</Link>
              <Link href="/register" className="bg-blue-600 text-white px-2 py-1 rounded text-sm">注册</Link>
            </>
          )}
          <button onClick={() => setOpen(!open)} className="ml-1 p-2 text-slate-500" aria-label="菜单">
            {open ? (
              <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M6 18L18 6M6 6l12 12" />
              </svg>
            ) : (
              <svg className="w-5 h-5" fill="none" stroke="currentColor" viewBox="0 0 24 24">
                <path strokeLinecap="round" strokeLinejoin="round" strokeWidth={2} d="M4 6h16M4 12h16M4 18h16" />
              </svg>
            )}
          </button>
        </div>
      </div>

      {open && (
        <div className="md:hidden border-t border-slate-100 bg-white px-4 py-3 space-y-1">
          <Link href="/" onClick={() => setOpen(false)} className="block py-2 text-slate-600 hover:text-blue-600 text-sm">仪表盘</Link>
          <Link href="/about" onClick={() => setOpen(false)} className="block py-2 text-slate-600 hover:text-blue-600 text-sm">说明</Link>
        </div>
      )}
    </nav>
  );
}