import { useState, useEffect } from 'react';
import ReactMarkdown from 'react-markdown';
import Layout from '../components/layout/Layout';

export default function HowItWorksPage() {
  const [content, setContent] = useState('');
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState('');

  useEffect(() => {
    // Fetch markdown content
    fetch('/content/how-it-works.md')
      .then(response => {
        if (!response.ok) {
          throw new Error('Failed to load content');
        }
        return response.text();
      })
      .then(text => {
        setContent(text);
        setLoading(false);
      })
      .catch(err => {
        console.error('Error loading how-it-works content:', err);
        setError('Failed to load page content');
        setLoading(false);
      });
  }, []);

  if (loading) {
    return (
      <Layout>
        <div className="min-h-screen bg-gray-50 flex items-center justify-center">
          <div className="text-center">
            <div className="w-12 h-12 border-4 border-primary-600 border-t-transparent rounded-full animate-spin mx-auto mb-4"></div>
            <p className="text-gray-600">Loading...</p>
          </div>
        </div>
      </Layout>
    );
  }

  if (error) {
    return (
      <Layout>
        <div className="min-h-screen bg-gray-50 flex items-center justify-center">
          <div className="text-center">
            <p className="text-red-600">{error}</p>
          </div>
        </div>
      </Layout>
    );
  }

  return (
    <Layout>
      <div className="min-h-screen bg-gray-50 py-12 px-4 sm:px-6 lg:px-8">
        <div className="max-w-4xl mx-auto">
          <article className="bg-white rounded-lg shadow-sm p-8 md:p-12 prose prose-lg max-w-none">
            <ReactMarkdown
              components={{
                // Customize link rendering to use React Router for internal links
                a: ({ node, href, children, ...props }) => {
                  const isInternal = href && href.startsWith('/');
                  if (isInternal) {
                    return (
                      <a href={href} {...props}>
                        {children}
                      </a>
                    );
                  }
                  return (
                    <a href={href} target="_blank" rel="noopener noreferrer" {...props}>
                      {children}
                    </a>
                  );
                },
                // Ensure images are responsive
                img: ({ node, ...props }) => (
                  <img className="rounded-lg shadow-md" {...props} alt={props.alt || ''} />
                ),
              }}
            >
              {content}
            </ReactMarkdown>
          </article>
        </div>
      </div>
    </Layout>
  );
}