#!/usr/bin/env node
/**
 * Tiefes Zusammenführen eines Patch-Objekts in eine Ceb-Locale-Datei.
 * Nutzung: node merge-ceb-locale-patch.mjs <ziel.json> <patch.json>
 */
import fs from 'fs';
import path from 'path';
import { fileURLToPath } from 'url';

const __dirname = path.dirname(fileURLToPath(import.meta.url));

function isPlainObject(value) {
  return value !== null && typeof value === 'object' && !Array.isArray(value);
}

function deepMerge(target, source) {
  if (!isPlainObject(source)) return target;
  const base = isPlainObject(target) ? { ...target } : {};
  for (const key of Object.keys(source)) {
    const sv = source[key];
    const tv = base[key];
    if (isPlainObject(sv) && isPlainObject(tv)) {
      base[key] = deepMerge(tv, sv);
    } else if (isPlainObject(sv)) {
      base[key] = deepMerge({}, sv);
    } else {
      base[key] = sv;
    }
  }
  return base;
}

const targetPath = path.resolve(process.argv[2] || '');
const patchPath = path.resolve(process.argv[3] || '');

if (!targetPath || !patchPath || !fs.existsSync(targetPath) || !fs.existsSync(patchPath)) {
  console.error('Usage: node merge-ceb-locale-patch.mjs <target.json> <patch.json>');
  process.exit(1);
}

const base = JSON.parse(fs.readFileSync(targetPath, 'utf8'));
const patch = JSON.parse(fs.readFileSync(patchPath, 'utf8'));
const merged = deepMerge(base, patch);
fs.writeFileSync(targetPath, JSON.stringify(merged, null, 4) + '\n', 'utf8');
console.log('Merged patch into', targetPath);