'use strict';

const unified = require('unified');
const remarkGfm = require('remark-gfm');
const remarkParse = require('remark-parse');
const remarkBreaks = require('remark-breaks');
const remarkMath = require('remark-math');
const remarkRehype = require('remark-rehype');
const rehypeKatex = require('rehype-katex');
const rehypeStringify = require('rehype-stringify');
const unistUtilVisit = require('unist-util-visit');

const remarkDolanRaw = () => {
  return (tree) => {
    unistUtilVisit.visit(tree, "code", (node) => {
      if (node.lang === "raw") {
        node.type = "html";
      }
    });
  };
};

function getRenderer(options = {}) {
  const renderer = unified.unified().use(remarkParse).use(remarkBreaks).use(remarkGfm).use(remarkMath).use(remarkDolanRaw);
  options.modifyRemark?.(renderer);
  renderer.use(remarkRehype, { allowDangerousHtml: true }).use(rehypeKatex);
  options.modifyRehype?.(renderer);
  renderer.use(rehypeStringify, { allowDangerousHtml: true });
  return renderer;
}
const defaultRenderer = getRenderer();
async function renderMarkdown(md) {
  return String(await defaultRenderer.process(md));
}
function renderMarkdownSync(md) {
  return String(defaultRenderer.processSync(md));
}

exports.defaultRenderer = defaultRenderer;
exports.getRenderer = getRenderer;
exports.renderMarkdown = renderMarkdown;
exports.renderMarkdownSync = renderMarkdownSync;