import { Suspense, lazy, useEffect, type ReactNode } from 'react'
import { BrowserRouter, Navigate, Route, Routes, useLocation } from 'react-router-dom'
import { ConfigProvider, Spin } from 'antd'
import deDE from 'antd/locale/de_DE'
import enUS from 'antd/locale/en_US'
import { QueryClient, QueryClientProvider } from '@tanstack/react-query'
import { useTranslation } from 'react-i18next'

import AppLayout from './components/Layout/AppLayout'
import apiClient, { isEnvelope } from './api/client'
import { useAuthStore, type SessionUser } from './stores/auth'

const LoginPage = lazy(() => import('./pages/Login'))
const SetupPage = lazy(() => import('./pages/Setup'))
const DashboardPage = lazy(() => import('./pages/Dashboard'))
const DomainsPage = lazy(() => import('./pages/Domains'))
const BackendsPage = lazy(() => import('./pages/Backends'))
const RoutingRulesPage = lazy(() => import('./pages/RoutingRules'))
const NetworksPage = lazy(() => import('./pages/Networks'))
const IPAddressesPage = lazy(() => import('./pages/IPAddresses'))
const ClusterPage = lazy(() => import('./pages/Cluster'))
const SettingsPage = lazy(() => import('./pages/Settings'))

const queryClient = new QueryClient({
  defaultOptions: {
    queries: { retry: 1, refetchOnWindowFocus: false },
  },
})

// Theme tokens 1:1 wie mail-gateway/enconf — colorPrimary, font,
// borderRadius, controlHeight. enterprise.css ergänzt mit eigenen
// Layout-Klassen (.app-layout, .sidebar, .header, …).
const antdTheme = {
  token: {
    colorPrimary: '#0EA5E9',
    borderRadius: 6,
    borderRadiusLG: 8,
    fontSize: 13,
    fontWeightStrong: 600,
    fontFamily: "'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif",
    colorBgContainer: '#FFFFFF',
    colorBgLayout: '#F8FAFC',
    colorBorder: '#E2E8F0',
    colorText: '#0F172A',
    colorTextSecondary: '#64748B',
    controlHeight: 34,
  },
}

function RequireAuth({ children }: { children: ReactNode }) {
  const user = useAuthStore((s) => s.user)
  const location = useLocation()
  if (!user) {
    return <Navigate to="/login" replace state={{ from: location }} />
  }
  return <>{children}</>
}

function SetupGate({ children }: { children: ReactNode }) {
  const location = useLocation()
  useEffect(() => {
    if (location.pathname.startsWith('/setup')) return
    apiClient.get('/setup/status').then((r) => {
      const env = r.data
      if (isEnvelope(env)) {
        const data = env.data as { completed?: boolean } | undefined
        if (data && data.completed === false) {
          window.location.replace('/setup')
        }
      }
    }).catch(() => { /* setup-gate is best-effort */ })
  }, [location.pathname])
  return <>{children}</>
}

export default function App() {
  const { i18n } = useTranslation()
  const antdLocale = i18n.language?.startsWith('de') ? deDE : enUS

  return (
    <ConfigProvider theme={antdTheme} locale={antdLocale}>
      <QueryClientProvider client={queryClient}>
        <BrowserRouter>
          <SetupGate>
            <Suspense fallback={<div className="loader-center"><Spin size="large" /></div>}>
              <Routes>
                <Route path="/setup" element={<SetupPage onComplete={(u: SessionUser) => useAuthStore.getState().set(u)} />} />
                <Route path="/login" element={<LoginPage onLogin={(u: SessionUser) => useAuthStore.getState().set(u)} />} />

                <Route element={<RequireAuth><AppLayout /></RequireAuth>}>
                  <Route path="/" element={<Navigate to="/dashboard" replace />} />
                  <Route path="/dashboard" element={<DashboardPage />} />
                  <Route path="/domains" element={<DomainsPage />} />
                  <Route path="/backends" element={<BackendsPage />} />
                  <Route path="/routing-rules" element={<RoutingRulesPage />} />
                  <Route path="/networks" element={<NetworksPage />} />
                  <Route path="/ip-addresses" element={<IPAddressesPage />} />
                  <Route path="/cluster" element={<ClusterPage />} />
                  <Route path="/settings" element={<SettingsPage />} />
                </Route>

                <Route path="*" element={<Navigate to="/dashboard" replace />} />
              </Routes>
            </Suspense>
          </SetupGate>
        </BrowserRouter>
      </QueryClientProvider>
    </ConfigProvider>
  )
}