'use client';

import React from 'react';
import Link from 'next/link';
import Image from 'next/image';
import { usePathname, useRouter } from 'next/navigation';
import { MessageSquare, Activity, Clock, Puzzle, Blocks, HelpCircle, FolderOpen, Store, LogIn, UserPlus, Bot, ServerCog, Mail, LogOut, UserCircle2 } from 'lucide-react';
import { logout } from '@/lib/api';
import { useChatStore } from '@/lib/store';

const NAV_ITEMS = [
  { name: '对话', href: '/', icon: MessageSquare },
  { name: '状态', href: '/status', icon: Activity },
  { name: '定时任务', href: '/cron', icon: Clock },
  { name: '技能', href: '/skills', icon: Puzzle },
  { name: '插件', href: '/plugins', icon: Blocks },
  { name: '智能体', href: '/agents', icon: Bot },
  { name: 'MCP', href: '/mcp', icon: ServerCog },
  { name: 'Outlook', href: '/outlook', icon: Mail },
  { name: '市场', href: '/marketplace', icon: Store },
  { name: '文件', href: '/files', icon: FolderOpen },
  { name: '帮助', href: '/help', icon: HelpCircle },
];

const AUTH_ITEMS = [
  { name: '登录', href: '/login', icon: LogIn },
  { name: '注册', href: '/register', icon: UserPlus },
];

function ConnectionDot() {
  const wsStatus = useChatStore((s) => s.wsStatus);
  const nanobotReady = useChatStore((s) => s.nanobotReady);

  const isOnline = wsStatus === 'connected' && nanobotReady === true;
  const isChecking = wsStatus === 'connected' && nanobotReady === null;
  const isConnecting = wsStatus === 'connecting' || isChecking;
  const isOffline = wsStatus === 'disconnected' || (wsStatus === 'connected' && nanobotReady === false);

  const color = isOnline
    ? 'bg-green-500'
    : isConnecting
      ? 'bg-yellow-500'
      : 'bg-red-500';

  const label = isOnline
    ? '已连接'
    : isChecking
      ? '检查中'
      : wsStatus === 'connecting'
        ? '连接中'
        : isOffline && wsStatus === 'connected'
          ? '服务离线'
          : '未连接';

  return (
    <div className="flex items-center gap-1.5 text-xs text-muted-foreground">
      <span className={`w-2 h-2 rounded-full ${color}`} />
      <span>{label}</span>
    </div>
  );
}

const Header = () => {
  const pathname = usePathname();
  const router = useRouter();
  const user = useChatStore((s) => s.user);
  const isAuthLoading = useChatStore((s) => s.isAuthLoading);
  const setUser = useChatStore((s) => s.setUser);

  const handleLogout = async () => {
    await logout();
    setUser(null);
    router.replace('/login');
    router.refresh();
  };

  return (
    <header className="fixed top-0 left-0 right-0 bg-background border-b border-border z-50">
      <div className="max-w-[1720px] mx-auto px-5 sm:px-6 lg:px-8 xl:px-10">
        <div className="flex items-center h-16 gap-6">
          <Link href="/" className="flex shrink-0 items-center gap-3 pr-2">
            <Image
              src="/boardware-logo.jpg"
              alt="Boardware logo"
              width={40}
              height={32}
              className="h-8 w-10 shrink-0 rounded-sm bg-white object-contain p-0.5"
            />
            <span className="whitespace-nowrap text-[1.05rem] font-semibold leading-none tracking-tight sm:text-[1.15rem]">
              Boardware Agent Sandbox
            </span>
          </Link>

          <div className="flex min-w-0 flex-1 items-center justify-end gap-3">
            <nav className="flex min-w-0 flex-1 items-center gap-1 overflow-x-auto whitespace-nowrap [scrollbar-width:none] [&::-webkit-scrollbar]:hidden">
              {NAV_ITEMS.map((item) => {
                const isActive =
                  item.href === '/'
                    ? pathname === '/'
                    : pathname.startsWith(item.href);
                const Icon = item.icon;
                return (
                  <Link
                    key={item.href}
                    href={item.href}
                    className={`flex shrink-0 items-center gap-1.5 rounded-md px-3 py-2 text-sm font-medium transition-colors ${
                      isActive
                        ? 'bg-primary text-primary-foreground'
                        : 'text-muted-foreground hover:bg-accent hover:text-accent-foreground'
                    }`}
                  >
                    <Icon className="w-4 h-4" />
                    {item.name}
                  </Link>
                );
              })}
            </nav>

            <div className="flex shrink-0 items-center gap-1.5 border-l border-border pl-4">
              {user ? (
                <>
                  <div className="flex items-center gap-1.5 rounded-md px-3 py-2 text-sm font-medium text-foreground">
                    <UserCircle2 className="w-4 h-4" />
                    <span className="max-w-32 truncate">{user.username}</span>
                  </div>
                  <button
                    type="button"
                    onClick={handleLogout}
                    className="flex items-center gap-1.5 rounded-md px-3 py-2 text-sm font-medium text-muted-foreground transition-colors hover:bg-accent hover:text-accent-foreground"
                  >
                    <LogOut className="w-4 h-4" />
                    退出登录
                  </button>
                </>
              ) : !isAuthLoading ? (
                AUTH_ITEMS.map((item) => {
                  const isActive = pathname.startsWith(item.href);
                  const Icon = item.icon;
                  return (
                    <Link
                      key={item.href}
                      href={item.href}
                      className={`flex items-center gap-1.5 rounded-md px-3 py-2 text-sm font-medium transition-colors ${
                        isActive
                          ? 'bg-primary text-primary-foreground'
                          : 'text-muted-foreground hover:bg-accent hover:text-accent-foreground'
                      }`}
                    >
                      <Icon className="w-4 h-4" />
                      {item.name}
                    </Link>
                  );
                })
              ) : null}
            </div>

            <div className="shrink-0 border-l border-border pl-4">
              <ConnectionDot />
            </div>
          </div>
        </div>
      </div>
    </header>
  );
};

export default Header;