const markdownHeading = /^(#{1,6})\s+(.+)$/;
const orderedListItem = /^(\d+)[.、]\s*(.+)$/;
const unorderedListItem = /^[-*]\s+(.+)$/;

export const formatComplianceContent = (value, documentTitle = "") => {
  if (typeof value !== "string" || !value.trim()) return [];

  const blocks = value
    .replace(/\r\n?/g, "\n")
    .split("\n")
    .map((line) => line.trim())
    .filter(Boolean)
    .map((line) => {
      const heading = line.match(markdownHeading);
      if (heading) {
        return {
          type: heading[1].length === 1 ? "title" : "heading",
          text: heading[2].trim(),
        };
      }

      const ordered = line.match(orderedListItem);
      if (ordered) {
        return {
          type: "list-item",
          marker: `${ordered[1]}.`,
          text: ordered[2].trim(),
        };
      }

      const unordered = line.match(unorderedListItem);
      if (unordered) {
        return { type: "list-item", marker: "•", text: unordered[1].trim() };
      }

      return { type: "paragraph", text: line };
    });

  const duplicateTitle =
    blocks[0]?.type === "title" &&
    blocks[0].text === String(documentTitle || "").trim();
  if (!duplicateTitle) return blocks;

  let contentBlocks = blocks.slice(1);
  while (
    contentBlocks[0]?.type === "paragraph" &&
    /^(?:版本号|版本|发布日期|生效日期)\s*[：:]/.test(contentBlocks[0].text)
  ) {
    contentBlocks = contentBlocks.slice(1);
  }
  return contentBlocks;
};