import { useEffect, useState } from 'react'
import { BrowserRouter, Link, Navigate, Route, Routes, useLocation, useNavigate } from 'react-router-dom'
import { App, ConfigProvider, Layout, Menu, Typography, Button, Tag, Space, Spin, type MenuProps } from 'antd'
import {
  AccountBookOutlined,
  ApiOutlined,
  DashboardOutlined,
  FileSearchOutlined,
  LogoutOutlined,
  SettingOutlined,
  ShopOutlined,
  UserOutlined,
} from '@ant-design/icons'
import { getMe, logout, type CurrentMember, getStoredToken } from './api'
import Dashboard from './pages/Dashboard'
import Sites from './pages/Sites'
import Rules from './pages/Rules'
import Payments from './pages/Payments'
import Accounts from './pages/Accounts'
import Settlements from './pages/Settlements'
import Orders from './pages/Orders'
import Login from './pages/Login'
import './style.css'

type MenuItem = Required<MenuProps>['items'][number] & { superadminOnly?: boolean }

const ALL_MENU_ITEMS: MenuItem[] = [
  { key: '/', icon: <DashboardOutlined />, label: <Link to="/">仪表盘</Link> },
  { key: '/sites', icon: <ShopOutlined />, label: <Link to="/sites">分销网站</Link>, superadminOnly: true },
  { key: '/sold', icon: <FileSearchOutlined />, label: <Link to="/sold">售出账号</Link> },
  { key: '/receive', icon: <AccountBookOutlined />, label: <Link to="/receive">分销收号</Link> },
  { key: '/settlements', icon: <AccountBookOutlined />, label: <Link to="/settlements">结算管理</Link> },
  { key: '/payments', icon: <ApiOutlined />, label: <Link to="/payments">支付通道</Link> },
  { key: '/accounts', icon: <SettingOutlined />, label: <Link to="/accounts">账号展示</Link> },
  { key: '/rules', icon: <SettingOutlined />, label: <Link to="/rules">比例与税费</Link> },
]

function MainLayout({ member, onLogout }: { member: CurrentMember; onLogout: () => void }) {
  const location = useLocation()
  const menuItems = ALL_MENU_ITEMS.filter((item) => !item.superadminOnly || member.is_superadmin)

  const selectedKey = menuItems.some((item) => item.key === location.pathname)
    ? location.pathname
    : '/'

  const roleLabel = member.is_superadmin
    ? '平台超级管理员'
    : member.member_type === 'operator'
    ? '分销运营'
    : member.member_type === 'finance'
    ? '分销财务'
    : '分销成员'

  return (
    <Layout className="app">
      <Layout.Sider breakpoint="lg" collapsedWidth="0">
        <div className="brand">
          <ShopOutlined style={{ fontSize: 20, color: '#1677ff' }} />
          <span>HFB 分销后台</span>
        </div>
        <Menu
          theme="dark"
          mode="inline"
          items={menuItems}
          selectedKeys={[selectedKey]}
        />
      </Layout.Sider>
      <Layout>
        <Layout.Header className="header">
          <div className="header-left">
            {member.is_superadmin ? (
              <Tag color="gold" style={{ fontSize: 13, padding: '2px 8px' }}>
                平台全局管理模式
              </Tag>
            ) : (
              <Tag color="blue" style={{ fontSize: 13, padding: '2px 8px' }}>
                {member.site_name || '当前分销站点'} · {member.domain || member.site_code}
              </Tag>
            )}
            <Typography.Text type="secondary" style={{ fontSize: 12 }}>
              主站 hao858.com · 分销管理系统
            </Typography.Text>
          </div>
          <div className="header-right">
            <Space size="middle">
              <div className="user-profile">
                <UserOutlined style={{ color: '#1677ff' }} />
                <Typography.Text strong style={{ fontSize: 13 }}>
                  {member.nickname || member.username}
                </Typography.Text>
                <Tag color={member.is_superadmin ? 'purple' : 'cyan'}>{roleLabel}</Tag>
              </div>
              <Button
                type="text"
                danger
                icon={<LogoutOutlined />}
                onClick={onLogout}
                size="small"
              >
                退出登录
              </Button>
            </Space>
          </div>
        </Layout.Header>
        <Layout.Content>
          <Routes>
            <Route path="/" element={<Dashboard />} />
            {member.is_superadmin && <Route path="/sites" element={<Sites isSuperadmin={true} />} />}
            <Route path="/rules" element={<Rules />} />
            <Route path="/payments" element={<Payments />} />
            <Route path="/accounts" element={<Accounts />} />
            <Route path="/settlements" element={<Settlements />} />
            <Route path="/sold" element={<Orders kind="sold" />} />
            <Route path="/receive" element={<Orders kind="receive" />} />
            <Route path="/orders" element={<Orders kind="all" />} />
            <Route path="*" element={<Navigate to="/" replace />} />
          </Routes>
        </Layout.Content>
      </Layout>
    </Layout>
  )
}

function AppContent() {
  const [member, setMember] = useState<CurrentMember | null>(null)
  const [loading, setLoading] = useState(true)
  const navigate = useNavigate()
  const location = useLocation()

  useEffect(() => {
    let active = true
    const checkAuth = async () => {
      // If no token exists and no session, skip getMe
      if (!getStoredToken() && location.pathname === '/login') {
        if (active) setLoading(false)
        return
      }
      try {
        const profile = await getMe()
        if (active) {
          setMember(profile)
          if (location.pathname === '/login') {
            navigate('/', { replace: true })
          }
        }
      } catch {
        if (active) {
          setMember(null)
          if (location.pathname !== '/login') {
            navigate('/login', { replace: true })
          }
        }
      } finally {
        if (active) setLoading(false)
      }
    }
    checkAuth()
    return () => {
      active = false
    }
  }, [location.pathname, navigate])

  const handleLogout = async () => {
    await logout()
    setMember(null)
    navigate('/login', { replace: true })
  }

  const handleLoginSuccess = (current: CurrentMember) => {
    setMember(current)
    navigate('/', { replace: true })
  }

  if (loading) {
    return (
      <div style={{ height: '100vh', display: 'flex', alignItems: 'center', justifyContent: 'center' }}>
        <Spin size="large" tip="正在加载分销系统..." />
      </div>
    )
  }

  if (location.pathname === '/login') {
    return <Login onSuccess={handleLoginSuccess} />
  }

  if (!member) {
    return <Navigate to="/login" replace />
  }

  return <MainLayout member={member} onLogout={handleLogout} />
}

export default function AppShell() {
  return (
    <BrowserRouter>
      <ConfigProvider
        theme={{
          token: {
            colorPrimary: '#1677ff',
            borderRadius: 6,
          },
        }}
      >
        <App>
          <AppContent />
        </App>
      </ConfigProvider>
    </BrowserRouter>
  )
}