import React from "react";
import PropTypes from "prop-types";

const RELOAD_DELAY_MS = 15000;

/**
 * Last line of defense for the unattended kiosk: any render error below shows
 * a minimal message instead of a blank screen and reloads the whole app after
 * a short delay, so the exhibit recovers without staff intervention.
 */
export class ErrorBoundary extends React.Component {
  constructor(props) {
    super(props);
    this.state = { hasError: false };
  }

  static getDerivedStateFromError() {
    return { hasError: true };
  }

  componentDidCatch(error, info) {
    // eslint-disable-next-line no-console
    console.error("Unhandled render error:", error, info.componentStack);
  }

  componentDidUpdate(prevProps, prevState) {
    if (!prevState.hasError && this.state.hasError) {
      this.reloadTimer = setTimeout(() => window.location.reload(), RELOAD_DELAY_MS);
    }
  }

  componentWillUnmount() {
    if (this.reloadTimer) clearTimeout(this.reloadTimer);
  }

  render() {
    if (this.state.hasError) {
      return (
        <div className="error-boundary">
          <p>Ein unerwarteter Fehler ist aufgetreten.</p>
          <p>Die Anwendung startet in wenigen Sekunden neu …</p>
        </div>
      );
    }
    return this.props.children;
  }
}

ErrorBoundary.propTypes = {
  children: PropTypes.node.isRequired,
};