#!/usr/bin/env node
/**
 * Benennt content/de/post/*.json5 um: _slug und Dateiname = slug (ohne führendes /).
 * Kollisionen erhalten Suffix -1, -2, …
 * Aktualisiert alle Referenzen in content/de.
 */

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 POST_DIR = path.join(CONTENT_DE, "post");

function slugFromPost(s) {
  if (!s || typeof s !== "string") return "";
  return s
    .trim()
    .replace(/^\//, "")
    .replace(/\.html?$/i, "")
    .replace(/_/g, "-")
    .replace(/[^a-z0-9-]/gi, "-")
    .replace(/-+/g, "-")
    .replace(/^-|-$/g, "");
}

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

const files = fs.readdirSync(POST_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(POST_DIR, file), "utf8");
  const data = parseJson5(raw);
  if (!data) continue;
  const slugVal = data.slug || "";
  let base = slugFromPost(slugVal) || oldSlug;
  if (!base) base = "post";
  const count = (baseCount.get(base) || 0) + 1;
  baseCount.set(base, count);
  const newSlug = count === 1 ? base : base + "-" + (count - 1);
  oldToNew.set(oldSlug, newSlug);
}

console.log("Slug-Map (Anzahl:", oldToNew.size, "):", Object.fromEntries([...oldToNew.entries()].slice(0, 10)), "...");

for (const file of files) {
  const oldSlug = file.replace(/\.json5$/, "");
  const newSlug = oldToNew.get(oldSlug);
  if (!newSlug) continue;
  const filePath = path.join(POST_DIR, file);
  const data = parseJson5(fs.readFileSync(filePath, "utf8"));
  data._slug = newSlug;
  const newPath = path.join(POST_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 escaped = oldSlug.replace(/[.*+?^${}()|[\]\\]/g, "\\$&");
    const newContent = content.replace(new RegExp('"' + escaped + '"', "g"), '"' + newSlug + '"');
    if (newContent !== content) {
      content = newContent;
      changed = true;
    }
  }
  if (changed) fs.writeFileSync(filePath, content, "utf8");
});

console.log("Fertig. Posts umbenannt und Referenzen aktualisiert.");