import { ProLayout } from '@ant-design/pro-components';
import { Button, Dropdown, Select, Skeleton, message } from 'antd';
import type { MenuProps } from 'antd';
import {
  Bot,
  ChevronDown,
  ClipboardList,
  Gift,
  LayoutDashboard,
  LogOut,
  MessageSquareMore,
  MapPinned,
  Settings,
  Star,
  Users,
} from 'lucide-react';
import { Outlet, history, useLocation } from '@umijs/max';
import { useEffect, useState } from 'react';

import {
  apiRequest,
  getSelectedBotId,
  jsonOptions,
  setCsrfToken,
  setSelectedBotId,
} from '@/services/api';
import { BotAccessContext } from '@/contexts/BotAccess';
import type { AdminUser, BotProfile } from '@/types';

const menuItems = [
  { path: '/dashboard', name: '概览', icon: <LayoutDashboard size={18} /> },
  { path: '/chats', name: '群组管理', icon: <Users size={18} /> },
  { path: '/giveaways', name: '抽奖管理', icon: <Gift size={18} /> },
  { path: '/points', name: '积分管理', icon: <Star size={18} /> },
  { path: '/directory', name: '师生与附近', icon: <MapPinned size={18} /> },
  { path: '/audit', name: '操作日志', icon: <ClipboardList size={18} /> },
  { path: '/settings', name: '系统设置', icon: <Settings size={18} /> },
];

export default function AdminLayout() {
  const location = useLocation();
  const [user, setUser] = useState<AdminUser | null>(null);
  const [bots, setBots] = useState<BotProfile[]>([]);
  const [selectedBot, setSelectedBot] = useState(getSelectedBotId());

  useEffect(() => {
    apiRequest<AdminUser>('/auth/me')
      .then((current) => {
        setCsrfToken(current.csrf_token);
        if (current.must_change_password) {
          history.replace('/change-password');
          return;
        }
        setUser(current);
      })
      .catch((error) => message.error(error.message));
  }, []);

  useEffect(() => {
    const loadBots = () => {
      apiRequest<{ items: BotProfile[] }>('/bots')
        .then(({ items }) => {
          setBots(items);
          const current = getSelectedBotId();
          if (current && items.some((item) => item.bot_id === current)) {
            setSelectedBot(current);
            return;
          }
          const first = items.find((item) => item.enabled) || items[0];
          const next = first?.bot_id || '';
          setSelectedBot(next);
          setSelectedBotId(next);
        })
        .catch(() => setBots([]));
    };
    loadBots();
    window.addEventListener('bot-profiles-changed', loadBots);
    return () => window.removeEventListener('bot-profiles-changed', loadBots);
  }, []);

  const selectedProfile = bots.find((item) => item.bot_id === selectedBot) || null;
  const rolePermissions = selectedProfile?.permissions;
  const hasPermission = (permission: string) =>
    rolePermissions === undefined || rolePermissions.includes(permission);
  const hasAnyPermission = (permissions: string[]) =>
    rolePermissions === undefined ||
    permissions.some((permission) => rolePermissions.includes(permission));
  const chatPermissions = [
    'chat.profile',
    'chat.members',
    'chat.permissions',
    'chat.announcements',
    'chat.invites',
    'chat.rules',
    'chat.notes',
    'automation.manage',
  ];
  const visibleMenuItems = menuItems.filter((item) => {
    if (item.path === '/chats') return hasAnyPermission(chatPermissions);
    if (item.path === '/points') return hasPermission('points.manage');
    if (item.path === '/giveaways') return hasPermission('giveaways.manage');
    if (item.path === '/directory') return hasPermission('teacher_directory.manage');
    return true;
  });

  useEffect(() => {
    if (!selectedProfile) return;
    const denied =
      (location.pathname.startsWith('/points') &&
        !hasPermission('points.manage')) ||
      (location.pathname.startsWith('/giveaways') &&
        !hasPermission('giveaways.manage')) ||
      (location.pathname.startsWith('/directory') &&
        !hasPermission('teacher_directory.manage')) ||
      (location.pathname.startsWith('/chats') &&
        !hasAnyPermission(chatPermissions));
    if (denied) history.replace('/dashboard');
  }, [selectedBot, bots, location.pathname]);

  const accountMenu: MenuProps['items'] = [
    {
      key: 'settings',
      icon: <Settings size={16} />,
      label: '账号设置',
      onClick: () => history.push('/settings'),
    },
    {
      key: 'logout',
      danger: true,
      icon: <LogOut size={16} />,
      label: '退出登录',
      onClick: async () => {
        await apiRequest('/auth/logout', jsonOptions('POST'));
        sessionStorage.removeItem('admin_csrf');
        history.replace('/login');
      },
    },
  ];

  if (!user) {
    return <Skeleton active style={{ padding: 24 }} />;
  }

  return (
    <BotAccessContext.Provider
      value={{ bot: selectedProfile, hasPermission, hasAnyPermission }}
    >
      <ProLayout
      title="Telegram 群管"
      logo={<Bot size={24} color="#fff" aria-hidden="true" />}
      location={{ pathname: location.pathname }}
      menu={{ request: async () => visibleMenuItems }}
      layout="mix"
      fixedHeader
      fixSiderbar
      siderWidth={224}
      breakpoint="lg"
      token={{
        header: { colorBgHeader: '#ffffff', colorTextMenu: '#17212b' },
        sider: { colorMenuBackground: '#17212b' },
        pageContainer: { paddingInlinePageContainerContent: 20 },
      }}
      menuItemRender={(item, dom) => (
        <button
          type="button"
          onClick={() => item.path && history.push(item.path)}
          style={{
            width: '100%',
            padding: 0,
            color: 'inherit',
            textAlign: 'left',
            background: 'transparent',
            border: 0,
            cursor: 'pointer',
          }}
        >
          {dom}
        </button>
      )}
      avatarProps={{
        src: undefined,
        icon: <MessageSquareMore size={18} />,
        title: (
          <Dropdown menu={{ items: accountMenu }} trigger={['click']}>
            <Button type="text" icon={<ChevronDown size={15} />} iconPosition="end">
              {user.username}
            </Button>
          </Dropdown>
        ),
        render: (_, dom) => dom,
      }}
      actionsRender={() => [
        <Select
          key="bot-selector"
          aria-label="当前机器人"
          value={selectedBot || undefined}
          placeholder="选择机器人"
          style={{ width: 200, maxWidth: '34vw' }}
          options={bots.map((item) => ({
            value: item.bot_id,
            label: item.identity?.username ? `@${item.identity.username}` : item.label,
          }))}
          onChange={(value) => {
            setSelectedBot(value);
            setSelectedBotId(value);
          }}
        />,
      ]}
      >
        <main className="page-content" id="main-content">
          <Outlet />
        </main>
      </ProLayout>
    </BotAccessContext.Provider>
  );
}