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

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

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

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

  componentDidCatch(error: Error, errorInfo: React.ErrorInfo) {
    console.error('App runtime error caught by boundary:', error, errorInfo);
  }

  handleReset = () => {
    try {
      localStorage.removeItem('result_app_session_v1');
    } catch {
      // ignore
    }
    window.location.reload();
  };

  render() {
    if (this.state.hasError) {
      return (
        <div className="min-h-screen bg-slate-900 text-white flex flex-col items-center justify-center p-6 text-center">
          <div className="max-w-md w-full bg-slate-800 p-6 rounded-2xl border border-slate-700 shadow-2xl">
            <div className="w-12 h-12 rounded-full bg-red-500/20 text-red-400 flex items-center justify-center mx-auto mb-4 text-2xl font-bold">
              !
            </div>
            <h2 className="text-xl font-bold mb-2">Something went wrong</h2>
            <p className="text-xs text-slate-400 mb-4">
              {this.state.error?.message || 'An unexpected rendering error occurred.'}
            </p>
            <div className="flex gap-2 justify-center">
              <button
                onClick={this.handleReset}
                className="bg-indigo-600 hover:bg-indigo-700 text-white text-xs font-bold px-4 py-2.5 rounded-lg transition-colors"
              >
                Reset Session &amp; Reload
              </button>
            </div>
          </div>
        </div>
      );
    }
    return this.props.children;
  }
}

createRoot(document.getElementById('root')!).render(
  <ErrorBoundary>
    <App />
  </ErrorBoundary>
);