import { Component, type ErrorInfo, type ReactNode } from 'react';
import { Button } from './Button';

interface Props {
  children: ReactNode;
  /** reset key — when it changes, the boundary clears its error */
  resetKey?: string | number;
}
interface State {
  error: Error | null;
}

/** Catches render errors so one broken screen never white-screens the whole app. */
export class ErrorBoundary extends Component<Props, State> {
  override state: State = { error: null };

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

  override componentDidCatch(error: Error, info: ErrorInfo): void {
    console.error('Render error caught by boundary:', error, info.componentStack);
  }

  override componentDidUpdate(prev: Props): void {
    if (prev.resetKey !== this.props.resetKey && this.state.error) {
      this.setState({ error: null });
    }
  }

  override render(): ReactNode {
    if (this.state.error) {
      return (
        <div className="m-6 rounded-lg border border-danger/40 bg-danger/10 p-6">
          <h2 className="text-lg font-semibold text-danger">Something went wrong</h2>
          <p className="mt-1 text-sm text-muted">
            This screen hit an error. Your data is safe — try again or reload.
          </p>
          <pre className="mt-3 max-h-40 overflow-auto rounded bg-surface p-3 text-xs text-muted">
            {this.state.error.message}
          </pre>
          <Button className="mt-4" variant="secondary" onClick={() => this.setState({ error: null })}>
            Try again
          </Button>
        </div>
      );
    }
    return this.props.children;
  }
}