import React from 'react';
import { createRoot } from 'react-dom/client';
import App from './App.tsx';
import './index.css';
import 'katex/dist/katex.min.css';

interface ErrorBoundaryProps {
  children: React.ReactNode;
}

interface ErrorBoundaryState {
  hasError: boolean;
  error: Error | null;
}

class RootErrorBoundary extends React.Component<ErrorBoundaryProps, ErrorBoundaryState> {
  constructor(props: ErrorBoundaryProps) {
    super(props);
    this.state = { hasError: false, error: null };
  }

  static getDerivedStateFromError(error: Error) {
    return { hasError: true, error };
  }

  componentDidCatch(error: Error, errorInfo: React.ErrorInfo) {
    console.error('Applet Crash Caught by ErrorBoundary:', error, errorInfo);
  }

  render() {
    if (this.state.hasError) {
      return (
        <div style={{
          minHeight: '100vh',
          display: 'flex',
          alignItems: 'center',
          justifyContent: 'center',
          backgroundColor: '#0f172a',
          color: '#f8fafc',
          padding: '24px',
          fontFamily: 'sans-serif'
        }}>
          <div style={{
            maxWidth: '560px',
            width: '100%',
            background: '#1e293b',
            padding: '32px',
            borderRadius: '24px',
            border: '1px solid #334155',
            boxShadow: '0 20px 25px -5px rgba(0, 0, 0, 0.5)'
          }}>
            <h2 style={{ fontSize: '20px', fontWeight: 'bold', color: '#10b981', marginBottom: '8px' }}>
              PakPrep Elite Portal
            </h2>
            <p style={{ fontSize: '14px', color: '#94a3b8', marginBottom: '16px' }}>
              The application encountered an unexpected runtime error.
            </p>
            <pre style={{
              background: '#0f172a',
              padding: '12px',
              borderRadius: '12px',
              fontSize: '12px',
              color: '#f43f5e',
              overflowX: 'auto',
              marginBottom: '20px'
            }}>
              {this.state.error?.message || 'Unknown error occurred'}
            </pre>
            <button
              onClick={() => {
                this.setState({ hasError: false, error: null });
                window.location.reload();
              }}
              style={{
                background: '#10b981',
                color: '#0f172a',
                padding: '10px 20px',
                borderRadius: '12px',
                fontWeight: 'bold',
                fontSize: '13px',
                border: 'none',
                cursor: 'pointer'
              }}
            >
              Reload Application
            </button>
          </div>
        </div>
      );
    }

    return this.props.children;
  }
}

const rootElement = document.getElementById('root');
if (rootElement) {
  createRoot(rootElement).render(
    <RootErrorBoundary>
      <App />
    </RootErrorBoundary>
  );
}