import PropTypes from 'prop-types';

import e from './createElement';
import h from './createHTML';
import x from './createScript';

const promiseShim =
  'window.Promise || document.write(\'\\x3Cscript src="/es6-promise@4.2.5/dist/es6-promise.min.js">\\x3C/script>\\x3Cscript>ES6Promise.polyfill()\\x3C/script>\')';

const fetchShim =
  'window.fetch || document.write(\'\\x3Cscript src="/whatwg-fetch@3.0.0/dist/fetch.umd.js">\\x3C/script>\')';

export default function MainTemplate({
  title,
  description,
  favicon,
  data,
  content,
  elements
}) {
  return e(
    'html',
    { lang: 'en' },
    e(
      'head',
      null,
      e('meta', { charSet: 'utf-8' }),
      e('meta', { httpEquiv: 'X-UA-Compatible', content: 'IE=edge,chrome=1' }),
      description && e('meta', { name: 'description', content: description }),
      e('meta', {
        name: 'viewport',
        content: 'width=device-width,initial-scale=1,maximum-scale=1'
      }),
      e('meta', { name: 'timestamp', content: new Date().toISOString() }),
      favicon && e('link', { rel: 'shortcut icon', href: favicon }),
      e('title', null, title),
      x(promiseShim),
      x(fetchShim),
      data && x(`window.__DATA__ = ${JSON.stringify(data)}`)
    ),
    e(
      'body',
      null,
      e('div', { id: 'root', dangerouslySetInnerHTML: content }),
      ...elements
    )
  );
}

MainTemplate.defaultProps = {
  title: 'UNPKG',
  description: 'The CDN for everything on npm',
  favicon: '/favicon.ico',
  content: h(''),
  elements: []
};

if (process.env.NODE_ENV !== 'production') {
  const htmlType = PropTypes.shape({
    __html: PropTypes.string
  });

  MainTemplate.propTypes = {
    title: PropTypes.string,
    description: PropTypes.string,
    favicon: PropTypes.string,
    data: PropTypes.any,
    content: htmlType,
    elements: PropTypes.arrayOf(PropTypes.node)
  };
}