import { lazy, Suspense, Component, type ReactNode } from 'react'
import { BrowserRouter, Routes, Route } from 'react-router-dom'
import { ThemeProvider } from './contexts/ThemeContext.tsx'
import { I18nProvider } from './i18n/I18nContext.tsx'
import AppLayout from './components/layout/AppLayout.tsx'
import LoadingSpinner from './components/common/LoadingSpinner.tsx'

const Dashboard = lazy(() => import('./pages/Dashboard.tsx'))
const JobMonitor = lazy(() => import('./pages/JobMonitor.tsx'))
const DataPipeline = lazy(() => import('./pages/DataPipeline.tsx'))
const AreaStats = lazy(() => import('./pages/AreaStats.tsx'))
const ApiExplorer = lazy(() => import('./pages/ApiExplorer.tsx'))

const BASE_URL = import.meta.env.VITE_BASE_URL || '/signal-batch'

/* React Error Boundary — 페이지 렌더링 에러 시 전체 앱 crash 방지 */
class ErrorBoundary extends Component<{ children: ReactNode }, { error: Error | null }> {
  state: { error: Error | null } = { error: null }

  static getDerivedStateFromError(error: Error) {
    return { error }
  }

  render() {
    if (this.state.error) {
      return (
        <div className="flex flex-col items-center justify-center gap-4 py-20">
          <h2 className="text-xl font-bold text-danger">Rendering Error</h2>
          <p className="text-sm text-muted">{this.state.error.message}</p>
          <button
            className="rounded bg-primary px-4 py-2 text-sm text-white"
            onClick={() => this.setState({ error: null })}
          >
            Retry
          </button>
        </div>
      )
    }
    return this.props.children
  }
}

export default function App() {
  return (
    <I18nProvider>
      <ThemeProvider>
        <BrowserRouter basename={BASE_URL}>
          <ErrorBoundary>
            <Routes>
              <Route element={<AppLayout />}>
                <Route index element={<Suspense fallback={<LoadingSpinner />}><Dashboard /></Suspense>} />
                <Route path="jobs" element={<Suspense fallback={<LoadingSpinner />}><JobMonitor /></Suspense>} />
                <Route path="pipeline" element={<Suspense fallback={<LoadingSpinner />}><DataPipeline /></Suspense>} />
                <Route path="area-stats" element={<Suspense fallback={<LoadingSpinner />}><AreaStats /></Suspense>} />
                <Route path="api-explorer" element={<Suspense fallback={<LoadingSpinner />}><ApiExplorer /></Suspense>} />
              </Route>
            </Routes>
          </ErrorBoundary>
        </BrowserRouter>
      </ThemeProvider>
    </I18nProvider>
  )
}