import React from 'react';
import ReactMarkdown from 'react-markdown';
import rehypeKatex from 'rehype-katex';
import rehypeHighlight from 'rehype-highlight';
import remarkMath from 'remark-math';
import remarkGfm from 'remark-gfm';
import rehypeRaw from 'rehype-raw'
import CodeBlock from './CodeBlock';
import { langSubset } from '~/utils/languages';

const Content = React.memo(({ content }) => {
  let rehypePlugins = [
    [rehypeKatex, { output: 'mathml' }],
    [
      rehypeHighlight,
      {
        detect: true,
        ignoreMissing: true,
        subset: langSubset
      }
    ],
    [rehypeRaw],
  ];

  return (
    <ReactMarkdown
      remarkPlugins={[remarkGfm, [remarkMath, { singleDollarTextMath: false }]]}
      rehypePlugins={rehypePlugins}
      linkTarget="_new"
      components={{
        code,
        p,
        // em,
      }}
    >
      {content}
    </ReactMarkdown>
  );
});

const code = React.memo((props) => {
  const { inline, className, children } = props;
  const match = /language-(\w+)/.exec(className || '');
  const lang = match && match[1];

  if (inline) {
    return <code className={className}>{children}</code>;
  } else {
    return (
      <CodeBlock
        lang={lang || 'text'}
        codeChildren={children}
      />
    );
  }
});

const p = React.memo((props) => {
  return <p className="whitespace-pre-wrap mb-2">{props?.children}</p>;
});

// const blinker = ({ node }) => {
//   if (node.type === 'text' && node.value === '█') {
//     return <span className="result-streaming">{node.value}</span>;
//   }

//   return null;
// };

// const em = React.memo(({ node, ...props }) => {
//   if (
//     props.children[0] &&
//     typeof props.children[0] === 'string' &&
//     props.children[0].startsWith('^')
//   ) {
//     return <sup>{props.children[0].substring(1)}</sup>;
//   }
//   if (
//     props.children[0] &&
//     typeof props.children[0] === 'string' &&
//     props.children[0].startsWith('~')
//   ) {
//     return <sub>{props.children[0].substring(1)}</sub>;
//   }
//   return <i {...props} />;
// });

export default Content;