#!/usr/bin/env node
/**
 * Benennt content/de/link_list/*.json5 um: _slug und Dateiname = "link-list-" + slugify(headline).
 * Kollisionen (z. B. gleiche Headline "Links") erhalten Suffix -1, -2, …
 * Aktualisiert alle Referenzen in content/de (pages, posts, …).
 */

import fs from "fs";
import path from "path";
import { fileURLToPath } from "url";

const __dirname = path.dirname(fileURLToPath(import.meta.url));
const CONTENT_DE = path.join(__dirname, "..", "content", "de");
const LINK_LIST_DIR = path.join(CONTENT_DE, "link_list");

function slugify(s) {
  if (!s || typeof s !== "string") return "";
  return s
    .trim()
    .toLowerCase()
    .replace(/\s+/g, "-")
    .replace(/[ää]/g, "ae")
    .replace(/[öö]/g, "oe")
    .replace(/[üü]/g, "ue")
    .replace(/ß/g, "ss")
    .replace(/[^a-z0-9-]/g, "-")
    .replace(/-+/g, "-")
    .replace(/^-|-$/g, "");
}

function parseJson5(str) {
  try {
    return JSON.parse(str);
  } catch {
    return null;
  }
}

const files = fs.readdirSync(LINK_LIST_DIR).filter((f) => f.endsWith(".json5")).sort();
const oldToNew = new Map();
const baseCount = new Map();

for (const file of files) {
  const oldSlug = file.replace(/\.json5$/, "");
  const raw = fs.readFileSync(path.join(LINK_LIST_DIR, file), "utf8");
  const data = parseJson5(raw);
  if (!data) continue;
  const headline = (data.headline || oldSlug).trim();
  let base = slugify(headline) || slugify(oldSlug);
  if (!base) base = "link-list";
  const count = (baseCount.get(base) || 0) + 1;
  baseCount.set(base, count);
  const newSlug = count === 1 ? "link-list-" + base : "link-list-" + base + "-" + (count - 1);
  oldToNew.set(oldSlug, newSlug);
}

console.log("Slug-Map:", Object.fromEntries(oldToNew));

for (const file of files) {
  const oldSlug = file.replace(/\.json5$/, "");
  const newSlug = oldToNew.get(oldSlug);
  if (!newSlug) continue;
  const filePath = path.join(LINK_LIST_DIR, file);
  const data = parseJson5(fs.readFileSync(filePath, "utf8"));
  data._slug = newSlug;
  const newPath = path.join(LINK_LIST_DIR, newSlug + ".json5");
  fs.writeFileSync(newPath, JSON.stringify(data, null, 2) + "\n", "utf8");
  if (newPath !== filePath) fs.unlinkSync(filePath);
}

function walkDir(dir, fn) {
  const entries = fs.readdirSync(dir, { withFileTypes: true });
  for (const e of entries) {
    const full = path.join(dir, e.name);
    if (e.isDirectory()) walkDir(full, fn);
    else if (e.name.endsWith(".json5")) fn(full);
  }
}

walkDir(CONTENT_DE, (filePath) => {
  let content = fs.readFileSync(filePath, "utf8");
  let changed = false;
  for (const [oldSlug, newSlug] of oldToNew) {
    if (oldSlug === newSlug) continue;
    const regex = new RegExp('"' + oldSlug.replace(/[.*+?^${}()|[\]\\]/g, "\\$&") + '"', "g");
    if (regex.test(content)) {
      content = content.replace(regex, '"' + newSlug + '"');
      changed = true;
    }
  }
  if (changed) fs.writeFileSync(filePath, content, "utf8");
});

console.log("Fertig. Link-Listen umbenannt und Referenzen aktualisiert.");