'use client';

import { useEffect, useRef, useState } from 'react';
import { useRouter } from 'next/navigation';
import { Diamond, ChevronDown, LogOut, Crown } from 'lucide-react';
import { useAdminStore } from '@/store/adminStore';
import { Badge } from '@/components/ui/badge';
import { Avatar } from './Avatar';

/**
 * 全局顶栏：左侧品牌 + 右侧用户菜单（头像 + 下拉含退出登录）。
 * 在所有 /admin/* 路由（除 /admin/login）渲染。
 */
export function TopBar() {
  const router = useRouter();
  const admin = useAdminStore((s) => s.admin);
  const [menuOpen, setMenuOpen] = useState(false);
  const menuRef = useRef<HTMLDivElement>(null);

  // 下拉打开时：监听外部点击 + Esc 键关闭
  useEffect(() => {
    if (!menuOpen) return;
    const onMouseDown = (e: MouseEvent) => {
      if (menuRef.current && !menuRef.current.contains(e.target as Node)) {
        setMenuOpen(false);
      }
    };
    const onKeyDown = (e: KeyboardEvent) => {
      if (e.key === 'Escape') setMenuOpen(false);
    };
    document.addEventListener('mousedown', onMouseDown);
    document.addEventListener('keydown', onKeyDown);
    return () => {
      document.removeEventListener('mousedown', onMouseDown);
      document.removeEventListener('keydown', onKeyDown);
    };
  }, [menuOpen]);

  const handleLogout = () => {
    setMenuOpen(false);
    useAdminStore.getState().logout();
    router.replace('/admin/login');
  };

  const nickname = admin?.nickname ?? admin?.username ?? '管理员';
  const username = admin?.username ?? 'admin';
  const isSuperAdmin = admin?.role === 'super_admin';

  return (
    <header className="sticky top-0 z-40 flex h-16 items-center justify-between border-b border-gray-200 bg-white/95 px-6 backdrop-blur">
      <div className="flex items-center gap-2">
        <Diamond className="h-6 w-6 text-brand-600" />
        <span className="text-base font-semibold text-gray-900">
          企业官网后台
        </span>
      </div>

      <div className="relative" ref={menuRef}>
        <button
          type="button"
          onClick={() => setMenuOpen((v) => !v)}
          className="flex items-center gap-2 rounded-md px-2 py-1.5 transition-colors hover:bg-gray-100"
          aria-haspopup="menu"
          aria-expanded={menuOpen}
        >
          <Avatar src={admin?.avatar} name={nickname} size={32} />
          <span className="text-sm font-medium text-gray-700">{nickname}</span>
          {isSuperAdmin && (
            <Badge variant="warning">
              <Crown className="h-3 w-3" /> 超管
            </Badge>
          )}
          <ChevronDown className="h-4 w-4 text-gray-500" />
        </button>

        {menuOpen && (
          <div
            role="menu"
            className="absolute right-0 top-full mt-2 w-60 overflow-hidden rounded-lg border border-gray-200 bg-white shadow-lg"
          >
            <div className="border-b border-gray-100 px-4 py-3">
              <div className="flex items-center gap-3">
                <Avatar src={admin?.avatar} name={nickname} size={40} />
                <div className="min-w-0">
                  <p className="truncate text-sm font-medium text-gray-900">
                    {nickname}
                  </p>
                  <p className="truncate text-xs text-gray-500">@{username}</p>
                </div>
              </div>
              <div className="mt-2">
                {isSuperAdmin ? (
                  <Badge variant="warning">
                    <Crown className="h-3 w-3" /> 超级管理员
                  </Badge>
                ) : (
                  <Badge variant="secondary">普通管理员</Badge>
                )}
              </div>
            </div>
            <button
              type="button"
              role="menuitem"
              onClick={handleLogout}
              className="flex w-full items-center gap-2 px-4 py-2.5 text-left text-sm text-red-600 transition-colors hover:bg-red-50"
            >
              <LogOut className="h-4 w-4" />
              退出登录
            </button>
          </div>
        )}
      </div>
    </header>
  );
}