import { Component, ErrorInfo, ReactNode } from 'react';

interface Props {
  children: ReactNode;
  fallback?: ReactNode;
}

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

export class ErrorBoundary extends Component<Props, State> {
  constructor(props: Props) {
    super(props);
    this.state = { hasError: false, error: null };
  }

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

  componentDidCatch(error: Error, info: ErrorInfo) {
    console.error('[ErrorBoundary] Caught error:', error, info.componentStack);
  }

  handleReset = () => {
    this.setState({ hasError: false, error: null });
    window.history.back();
  };

  render() {
    if (this.state.hasError) {
      if (this.props.fallback) return this.props.fallback;

      return (
        <div
          style={{
            minHeight: '60vh',
            display: 'flex',
            flexDirection: 'column',
            alignItems: 'center',
            justifyContent: 'center',
            padding: '2rem',
            fontFamily: 'system-ui, sans-serif',
          }}
        >
          <h2 style={{ color: '#dc2626', fontSize: '1.25rem', marginBottom: '0.5rem' }}>
            Something went wrong
          </h2>
          <p style={{ color: '#6b7280', fontSize: '0.875rem', marginBottom: '1rem', maxWidth: 480, textAlign: 'center' }}>
            {this.state.error?.message ?? 'An unexpected error occurred while rendering this page.'}
          </p>
          <button
            onClick={this.handleReset}
            style={{
              padding: '0.5rem 1.25rem',
              background: '#059669',
              color: '#fff',
              border: 'none',
              borderRadius: '0.375rem',
              cursor: 'pointer',
              fontSize: '0.875rem',
            }}
          >
            ← Go Back
          </button>
        </div>
      );
    }

    return this.props.children;
  }
}