/*
 * sync-build-version.js — make `buildNumber` mean something.
 *
 * package.json carried TWO build numbers: a top-level `buildNumber` that was
 * dutifully bumped every release and read by absolutely nothing, and
 * `build.buildVersion` — the one electron-builder writes to CFBundleVersion —
 * hardcoded at "51" since 3.4.0. So the installed app reported build 51 while
 * the release was build 55, and the DMG filename was the only honest clue
 * anywhere. Runs as `predist`, so bumping buildNumber alone is now enough.
 */
'use strict';
const fs = require('fs');
const path = require('path');

const p = path.join(__dirname, '..', 'package.json');
const raw = fs.readFileSync(p, 'utf8');
const pkg = JSON.parse(raw);

const want = String(pkg.buildNumber || '').trim();
if (!want) {
  console.error('package.json has no buildNumber — refusing to build a build with no number');
  process.exit(1);
}
if (!/^\d+$/.test(want)) {
  console.error('buildNumber must be digits, got "' + want + '"');
  process.exit(1);
}

const have = String((pkg.build && pkg.build.buildVersion) || '');
if (have === want) {
  console.log('build number ' + want + ' (CFBundleVersion already matches)');
  process.exit(0);
}

/* Rewrite the one value textually rather than re-serialising the whole file, so
   this never reformats a config the operator's settings depend on. */
const re = /("buildVersion"\s*:\s*")([^"]*)(")/;
if (!re.test(raw)) {
  console.error('could not find build.buildVersion in package.json');
  process.exit(1);
}
fs.writeFileSync(p, raw.replace(re, '$1' + want + '$3'));
console.log('CFBundleVersion ' + (have || '(unset)') + ' -> ' + want);