import { toText } from "hast-util-to-text";
import remarkFrontmatter from "remark-frontmatter";
import remarkGfm from "remark-gfm";
import remarkParse from "remark-parse";
import remarkRehype from "remark-rehype";
import { unified } from "unified";

const processor = unified()
  .use(remarkParse)
  .use(remarkFrontmatter, ["yaml", "toml"])
  .use(remarkGfm)
  .use(remarkRehype);

function fallbackTitle(filePath) {
  return filePath.toLowerCase().endsWith(".md") ? filePath.slice(0, -3) : filePath;
}

export function analyzeMarkdown(markdown, filePath) {
  const mdast = processor.parse(markdown);
  const hast = processor.runSync(mdast);
  const heading = hast.children.find(
    (node) => node.type === "element" && node.tagName === "h1",
  );

  return {
    title: heading ? toText(heading).trim() : fallbackTitle(filePath),
    textContent: toText(hast).trim(),
  };
}