#!/usr/bin/env node
/**
 * Derives the shipping single-file build from the demo build.
 *
 * The two files are a published parity claim: they must be byte-identical
 * except for (a) the demo bootstrap script and (b) one caret CSS declaration
 * that only matters inside the demo iframe. This script enforces that by
 * generating the shipping file rather than maintaining it by hand.
 */
import { readFileSync, writeFileSync, mkdirSync } from 'node:fs';

const DEMO = 'public/demo-app/index.html';
const OUT = 'release/The_Eternal_Journal.html';

let html = readFileSync(DEMO, 'utf8');

// (a) caret CSS — demo only
const caret = '\n  caret-color:var(--tx);-webkit-text-fill-color:var(--tx);}';
if (!html.includes(caret)) throw new Error('caret CSS anchor not found');
html = html.replace(caret, '}');

// (b) demo bootstrap script block — demo only
const start = html.indexOf('<script>\n/* \u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550\u2550 DEMO BOOTSTRAP');
const end = html.indexOf('</script>', start);
if (start === -1 || end === -1) throw new Error('demo bootstrap block not found');
html = html.slice(0, start) + html.slice(end + '</script>\n'.length);

if (/demoBoot|seed\.json|window\.__EJ_ALLOW_SHORT_PASSPHRASE = true/.test(html)) {
  throw new Error('demo-only code leaked into the shipping build');
}

mkdirSync('release', { recursive: true });
writeFileSync(OUT, html);
console.log(`wrote ${OUT} (${html.length} bytes)`);