// Build an opt-in production bundle WITHOUT changing runtime semantics.
//
// The feature modules share a single global scope and are executed in a fixed order
// (see loader.js). We therefore CONCATENATE them in that exact order into one file and
// minify whitespace/syntax only — identifiers are kept, because inline HTML handlers
// (onclick="navTo(...)") and cross-file references rely on global names.
//
// Run: npm run minify  →  static/dist/main.min.js
// Enable at runtime with window.APP_USE_BUNDLE=true (or ?bundle=1). Default stays
// per-file so editing static/js/* is live without a rebuild.
import { transform } from 'esbuild';
import { readFileSync, writeFileSync, mkdirSync } from 'node:fs';
import { dirname, join } from 'node:path';
import { fileURLToPath } from 'node:url';

const root = join(dirname(fileURLToPath(import.meta.url)), '..');
const jsDir = join(root, 'static', 'js');
const outDir = join(root, 'static', 'dist');
mkdirSync(outDir, { recursive: true });

// Must match loader.js batch C order exactly.
const MAIN = [
  'voice-picker', 'voice-inspector', 'seed-finder', 'voice-sources', 'fishaudio-browser',
  'integrations', 'routing', 'voice-clone', 'voice-library', 'tts-preview',
  'benchmark', 'stt', 'rehearser-parse', 'rehearser', 'reader', 'audiobook', 'character-sheets',
  'characters-library',
].map(n => join(jsDir, n + '.js'));

const source = MAIN.map(f => `\n/* ==== ${f.split('/').pop()} ==== */\n` + readFileSync(f, 'utf8')).join('\n');

const { code } = await transform(source, {
  loader: 'js',
  minify: false,
  minifyWhitespace: true,
  minifySyntax: true,
  minifyIdentifiers: false,   // keep global names referenced by HTML & other files
  legalComments: 'none',
  target: ['es2019', 'safari14'],
});

const out = join(outDir, 'main.min.js');
writeFileSync(out, code);
console.log(`Bundled ${MAIN.length} modules → static/dist/main.min.js (${(code.length / 1024).toFixed(0)} KB)`);
