import { marked } from "marked";
import DOMPurify from "dompurify";
import { linkifyTags, linkifyWikilinks } from "@/utils/tags";

function decodeEntities(text: string): string {
  const textarea = document.createElement("textarea");
  textarea.innerHTML = text;
  return textarea.value;
}

export function renderMarkdown(text: string): string {
  const decoded = decodeEntities(text);
  const html = marked(decoded) as string;
  const withTags = linkifyTags(html);
  const withLinks = linkifyWikilinks(withTags);
  const sanitized = DOMPurify.sanitize(withLinks, {
    ADD_ATTR: ["data-tag", "data-title"],
  });
  // marked escapes ' to ' — replace after sanitization to ensure clean rendering
  return sanitized.replace(/'/g, "'");
}

export function renderPreview(text: string): string {
  const decoded = decodeEntities(text);
  const html = marked(decoded) as string;
  const withTags = linkifyTags(html);
  const withLinks = linkifyWikilinks(withTags);
  const sanitized = DOMPurify.sanitize(withLinks, {
    FORBID_TAGS: ["a", "img"],
  });
  return sanitized.replace(/'/g, "'");
}