#!/usr/bin/env node
/**
 * de-CH: Alle ererbten de-Strings als Override mit CH-Orthografie (ß→ss, …).
 * Bestehende de-CH-Overrides bleiben erhalten.
 */
const fs = require('fs');
const path = require('path');

const ROOT = path.resolve(__dirname, '..');
const LOCALES_DIR = path.join(ROOT, 'frontend', 'src', 'i18n', 'locales');

const CH_REPLACEMENTS = [
  [/ß/g, 'ss'],
  [/Straße/g, 'Strasse'],
  [/straße/g, 'strasse'],
  [/Grüße/g, 'Grüsse'],
  [/grüße/g, 'grüsse'],
  [/Gruß/g, 'Gruss'],
  [/gruß/g, 'gruss'],
];

function toSwiss(text) {
  let out = text;
  for (const [re, rep] of CH_REPLACEMENTS) {
    out = out.replace(re, rep);
  }
  return out;
}

function flatten(obj, prefix = '', out = {}) {
  for (const [key, value] of Object.entries(obj || {})) {
    const nextKey = prefix ? `${prefix}.${key}` : key;
    if (value && typeof value === 'object' && !Array.isArray(value)) {
      flatten(value, nextKey, out);
    } else if (typeof value === 'string') {
      out[nextKey] = value;
    }
  }
  return out;
}

function deepMerge(base, override) {
  if (!base || typeof base !== 'object' || Array.isArray(base)) return override ?? base;
  const result = { ...base };
  for (const [key, value] of Object.entries(override || {})) {
    if (
      value && typeof value === 'object' && !Array.isArray(value) &&
      result[key] && typeof result[key] === 'object' && !Array.isArray(result[key])
    ) {
      result[key] = deepMerge(result[key], value);
    } else {
      result[key] = value;
    }
  }
  return result;
}

function setByPath(obj, dotPath, value) {
  const parts = dotPath.split('.');
  let cur = obj;
  for (let i = 0; i < parts.length - 1; i++) {
    if (!cur[parts[i]] || typeof cur[parts[i]] !== 'object') cur[parts[i]] = {};
    cur = cur[parts[i]];
  }
  cur[parts[parts.length - 1]] = value;
}

function buildOverrides(deFlat, targetFlat) {
  const out = {};
  for (const [key, value] of Object.entries(targetFlat)) {
    if (value !== deFlat[key]) setByPath(out, key, value);
  }
  return out;
}

const de = JSON.parse(fs.readFileSync(path.join(LOCALES_DIR, 'de.json'), 'utf8'));
const ch = JSON.parse(fs.readFileSync(path.join(LOCALES_DIR, 'de-CH.json'), 'utf8'));
const deFlat = flatten(de);
const merged = flatten(deepMerge(JSON.parse(JSON.stringify(de)), ch));

let patched = 0;
for (const key of Object.keys(deFlat)) {
  if (merged[key] === deFlat[key]) {
    const swiss = toSwiss(deFlat[key]);
    if (swiss !== deFlat[key] || !Object.prototype.hasOwnProperty.call(flatten(ch), key)) {
      merged[key] = swiss;
      if (swiss !== deFlat[key]) patched++;
    }
  }
}

// Alle Keys: CH-Text als Override wenn abweichend von de
for (const key of Object.keys(deFlat)) {
  const swiss = toSwiss(deFlat[key]);
  if (merged[key] !== deFlat[key]) continue;
  merged[key] = swiss;
}

const overrides = buildOverrides(deFlat, merged);
const outPath = path.join(LOCALES_DIR, 'de-CH.json');
fs.writeFileSync(outPath, `${JSON.stringify(overrides, null, 2)}\n`, 'utf8');

const stillDe = Object.keys(deFlat).filter((k) => merged[k] === deFlat[k]).length;
console.log(`de-CH: overrides=${Object.keys(flatten(overrides)).length}, ss-patched=${patched}, stillDe=${stillDe}`);