#!/usr/bin/env node
/**
 * Normalisiert alle Markdown-Dateien: _slug und Dateiname = "markdown-" + beschreibender Teil.
 * - component-markdown-X → markdown-X
 * - X-markdown / X-Markdown → markdown-X
 * - markdown-X bleibt markdown-X (evtl. _ → -)
 * - Sonstige → markdown-X
 * 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 MARKDOWN_DIR = path.join(CONTENT_DE, "markdown");

function normalize(base) {
  let rest = base.replace(/_/g, "-").toLowerCase();
  if (rest.startsWith("component-markdown-")) {
    rest = rest.slice(19);
  } else if (rest.startsWith("markdown-")) {
    rest = rest.slice(9);
  } else if (rest.endsWith("-markdown")) {
    rest = rest.slice(0, -9);
  } else {
    // z. B. "energiequelle-...", "Page-blog-Markdown" -> schon lowercase "page-blog-markdown" -> rest = "page-blog"
    if (rest.endsWith("-markdown")) rest = rest.slice(0, -9);
  }
  return "markdown-" + rest;
}

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

const files = fs.readdirSync(MARKDOWN_DIR).filter((f) => f.endsWith(".json5")).sort();
const oldToNew = new Map();
const used = new Set();

for (const file of files) {
  const base = file.replace(/\.json5$/, "");
  const raw = fs.readFileSync(path.join(MARKDOWN_DIR, file), "utf8");
  const data = parseJson5(raw);
  const oldSlug = data?._slug || base;
  let newSlug = normalize(base);
  let n = 0;
  while (used.has(newSlug)) {
    n++;
    newSlug = normalize(base) + (n === 1 ? "-1" : "-" + n);
  }
  used.add(newSlug);
  oldToNew.set(oldSlug, newSlug);
}

console.log("Markdown-Slug-Map (Anzahl:", oldToNew.size, ")");
for (const [oldSlug, newSlug] of oldToNew) {
  if (oldSlug !== newSlug) console.log(" ", oldSlug, "→", newSlug);
}

for (const file of files) {
  const base = file.replace(/\.json5$/, "");
  const oldSlug = parseJson5(fs.readFileSync(path.join(MARKDOWN_DIR, file), "utf8"))?._slug || base;
  const newSlug = oldToNew.get(oldSlug);
  if (!newSlug) continue;
  const filePath = path.join(MARKDOWN_DIR, file);
  const data = parseJson5(fs.readFileSync(filePath, "utf8"));
  data._slug = newSlug;
  const newPath = path.join(MARKDOWN_DIR, newSlug + ".json5");
  fs.writeFileSync(newPath, JSON.stringify(data, null, 2) + "\n", "utf8");
  if (path.basename(newPath) !== file) 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. Markdown-Slugs normalisiert und Referenzen aktualisiert.");