import { lazy, Suspense, useCallback, useEffect, useState } from 'react'
import { BrowserRouter, Routes, Route, Navigate, Link, useLocation } from 'react-router-dom'
import { AuthProvider, useAuth } from './context/AuthContext'
import Sidebar from './components/Navbar'
import Logo from './components/Logo'
import LoginPage from './pages/LoginPage'
import TicketsPage from './pages/TicketsPage'
import TicketPage from './pages/TicketPage'
import PlanboardPage from './pages/PlanboardPage'
import ProjectsPage from './pages/ProjectsPage'
import AdminPage from './pages/AdminPage'
import CustomersPage from './pages/CustomersPage'
import CustomerDetailPage from './pages/CustomerDetailPage'
import CustomerChatPage from './pages/CustomerChatPage'
import StorageTasksPage from './pages/StorageTasksPage'
import CreditsPage from './pages/CreditsPage'
import OffersPage from './pages/OffersPage'
import FinancePage from './pages/FinancePage'
import FinanceSettingsPage from './pages/FinanceSettingsPage'
import LegalPage from './pages/LegalPage'
import AssignProjectPage from './pages/AssignProjectPage'
import ServicesPage from './pages/ServicesPage'
import ServerpulsPage from './pages/ServerpulsPage'
import BankCallbackPage from './pages/BankCallbackPage'
import AdminRoute from './components/AdminRoute'
import RouteErrorBoundary from './components/RouteErrorBoundary'
import { safeReturnPath } from './lib/returnPath'

// Hochhaus der Hustler: erst beim Öffnen laden, damit Engine und Schrift nicht im Haupt-Bundle liegen
const WorkersPage = lazy(() => import('./pages/WorkersPage'))

function ProtectedRoute({ children }) {
  const { user, loading } = useAuth()
  const location = useLocation()

  if (loading) {
    return <div className="loading">Wird geladen …</div>
  }

  if (!user) {
    return <Navigate to="/login" state={{ from: location }} replace />
  }

  return children
}

// Alte Adressen /leads und /workers führen auf /hustler, die Query bleibt (/workers?tab=botleads&bot=<id> wird /hustler?tab=botleads&bot=<id>)
function HustlerRedirect() {
  const { search } = useLocation()
  return <Navigate to={`/hustler${search}`} replace />
}

function AppRoutes() {
  const { user } = useAuth()
  const location = useLocation()

  return (
    <Routes>
      <Route path="/login" element={user ? <Navigate to={safeReturnPath(location.state?.from)} replace /> : <LoginPage />} />
      <Route path="/" element={<Navigate to="/tickets" replace />} />
      <Route path="/tickets" element={<ProtectedRoute><TicketsPage /></ProtectedRoute>} />
      <Route path="/tickets/:ref/:tab?" element={<ProtectedRoute><TicketPage /></ProtectedRoute>} />
      <Route path="/customers" element={<ProtectedRoute><CustomersPage /></ProtectedRoute>} />
      {/* Messenger (Kunden -> Chat); statische Pfade gehen in react-router vor /customers/:id */}
      <Route path="/customers/chat" element={<ProtectedRoute><CustomerChatPage /></ProtectedRoute>} />
      <Route path="/customers/email-speicher" element={<ProtectedRoute><StorageTasksPage /></ProtectedRoute>} />
      <Route path="/customers/gutschriften" element={<ProtectedRoute><CreditsPage /></ProtectedRoute>} />
      <Route path="/customers/angebote" element={<ProtectedRoute><OffersPage /></ProtectedRoute>} />
      <Route path="/customers/:id" element={<ProtectedRoute><CustomerDetailPage /></ProtectedRoute>} />
      <Route path="/hustler" element={<ProtectedRoute><Suspense fallback={<div className="loading">Wird geladen …</div>}><WorkersPage /></Suspense></ProtectedRoute>} />
      <Route path="/leads" element={<HustlerRedirect />} />
      <Route path="/workers" element={<HustlerRedirect />} />
      {/* Finanzen: nur Admins, alle anderen gehen zu /tickets */}
      <Route path="/finance" element={<ProtectedRoute><AdminRoute><FinancePage /></AdminRoute></ProtectedRoute>} />
      <Route path="/finance/einstellungen" element={<ProtectedRoute><AdminRoute><FinanceSettingsPage /></AdminRoute></ProtectedRoute>} />
      <Route path="/finanzen/bank-callback" element={<ProtectedRoute><AdminRoute><BankCallbackPage /></AdminRoute></ProtectedRoute>} />
      <Route path="/rechtliches" element={<ProtectedRoute><LegalPage /></ProtectedRoute>} />
      <Route path="/serverpuls" element={<ProtectedRoute><ServerpulsPage /></ProtectedRoute>} />
      <Route path="/planboard" element={<ProtectedRoute><PlanboardPage /></ProtectedRoute>} />
      <Route path="/projects" element={<ProtectedRoute><ProjectsPage /></ProtectedRoute>} />
      <Route path="/services" element={<ProtectedRoute><ServicesPage /></ProtectedRoute>} />
      <Route path="/projects/zuordnen/:id" element={<ProtectedRoute><AssignProjectPage /></ProtectedRoute>} />
      <Route path="/admin" element={<ProtectedRoute><AdminPage /></ProtectedRoute>} />
      {/* Alte Links (z. B. die entfernten Seiten Assets, Reports, Docs, Roadmaps) landen bei den Tickets */}
      <Route path="*" element={<Navigate to="/tickets" replace />} />
    </Routes>
  )
}

function AppContent() {
  const { user } = useAuth()
  const location = useLocation()
  // Schublade des Menues auf dem Handy; auf dem Desktop steht das Menue fest und menuOpen bleibt ohne Wirkung
  const [menuOpen, setMenuOpen] = useState(false)
  const open = useCallback(() => setMenuOpen(true), [])
  const close = useCallback(() => setMenuOpen(false), [])

  // Seitenwechsel (nur der Pfad, nicht ?woid= oder ?tab=): Schublade zu und wieder nach oben
  useEffect(() => {
    setMenuOpen(false)
    window.scrollTo(0, 0)
  }, [location.pathname])

  // Esc schliesst die Schublade, nur solange sie offen ist und nur, wenn kein anderer Baustein die Taste schon behandelt hat
  useEffect(() => {
    if (!menuOpen) return undefined
    const onKey = (e) => {
      if (e.defaultPrevented) return
      if (e.key === 'Escape') setMenuOpen(false)
    }
    document.addEventListener('keydown', onKey)
    return () => document.removeEventListener('keydown', onKey)
  }, [menuOpen])

  if (!user) {
    return <AppRoutes />
  }

  return (
    <div className={`shell${menuOpen ? ' menu-open' : ''}`}>
      <Sidebar onNavigate={close} />
      <div className="scrim" onClick={close} />
      <div className="main">
        <div className="mobile-bar">
          <Link className="brand" to="/tickets"><Logo />WEBklar</Link>
          <button type="button" className="btn btn-quiet" onClick={open} aria-expanded={menuOpen} aria-controls="menue">Menü</button>
        </div>
        {/* Fängt u. a. einen fehlenden lazy-Chunk ab (alter Tab nach einem Deploy): Menü bleibt, Knopf lädt neu */}
        <main id="inhalt"><RouteErrorBoundary resetKey={location.pathname}><AppRoutes /></RouteErrorBoundary></main>
      </div>
    </div>
  )
}

export default function App() {
  return (
    <BrowserRouter>
      <AuthProvider>
        <AppContent />
      </AuthProvider>
    </BrowserRouter>
  )
}