#!/usr/bin/env node
/**
 * Patches TriliumNext's bundled main.cjs to register Korean ("ko") as a
 * selectable UI language.
 *
 * Why this is needed: the list of supported UI languages is not derived
 * from the translations/ folders on disk — it's a hardcoded array literal
 * baked into the minified server bundle (variable name may change between
 * builds; as of triliumnext/notes:latest on 2026-08-25 it was `K5i`).
 * A second hardcoded map (`IMi` as of the same build) lazy-loads a
 * per-language resource (CKEditor's own locale bundle) and has no entry
 * for "ko" either — since that resource is genuinely not bundled for any
 * language we didn't already support, we alias it to the English loader
 * instead of trying to fabricate a missing chunk.
 *
 * Usage: node patch_main_cjs.js /path/to/main.cjs
 *
 * Run this against a FRESH copy of main.cjs extracted from the image
 * (`docker cp trilium:/usr/src/app/main.cjs .`) any time the image is
 * updated, since the minified variable names (K5i, IMi, xvr) and byte
 * offsets are not stable across TriliumNext releases. After patching,
 * always run `node --check main.cjs` before deploying it.
 */
const fs = require('fs');
const path = process.argv[2];
if (!path) {
  console.error('Usage: node patch_main_cjs.js /path/to/main.cjs');
  process.exit(1);
}

let content = fs.readFileSync(path, 'utf8');
let patchedAnything = false;

// --- Patch 1: register "ko" in the main supported-locales array ---
// Original starts with: K5i=[{id:"en",name:"English",electronLocale:"en"},{id:"de"
// We insert a new first element right after the opening `[`.
{
  const marker = 'K5i=[{id:"en",name:"English",electronLocale:"en"},{id:"de"';
  const idx = content.indexOf(marker);
  if (idx === -1) {
    console.log('[skip] locale-list marker not found (variable name may have changed, or already patched)');
  } else {
    const insertPoint = idx + 'K5i=['.length;
    const insertion = '{id:"ko",name:"한국어",electronLocale:"ko"},';
    content = content.slice(0, insertPoint) + insertion + content.slice(insertPoint);
    console.log('[ok] inserted "ko" into the supported-locales array');
    patchedAnything = true;
  }
}

// --- Patch 2: alias "ko" to the English loader in the per-language resource map ---
// Original: IMi={ar:...,cn:...,de:...,en:()=>Promise.resolve().then(()=>Xe(xvr())),es:...
{
  const imiIdx = content.indexOf('IMi={ar:');
  const marker = 'en:()=>Promise.resolve().then(()=>Xe(xvr())),es:';
  const idx = content.indexOf(marker);
  if (imiIdx === -1 || idx === -1 || idx < imiIdx || idx > imiIdx + 700) {
    console.log('[skip] per-language resource map marker not found or not where expected (already patched, or minified names changed)');
  } else {
    const insertion = 'en:()=>Promise.resolve().then(()=>Xe(xvr())),ko:()=>Promise.resolve().then(()=>Xe(xvr())),es:';
    content = content.slice(0, idx) + insertion + content.slice(idx + marker.length);
    console.log('[ok] aliased "ko" to the English loader in the resource map');
    patchedAnything = true;
  }
}

if (!patchedAnything) {
  console.log('Nothing patched (file may already be patched, or this is a different TriliumNext version — re-derive the markers manually).');
  process.exit(0);
}

fs.writeFileSync(path, content, 'utf8');
console.log('Wrote', path, '— now run: node --check', path);