utils.js

// ── Terminal & Input Utilities ───────────────────────────────
import { EventEmitter } from 'events';
import readline from 'readline';

// Input bus
export const keys = new EventEmitter();
keys.setMaxListeners(30);
readline.emitKeypressEvents(process.stdin);
if (process.stdin.isTTY) process.stdin.setRawMode(true);
process.stdin.on('keypress', (str, key) => keys.emit('key', str, key));

export const waitKey = () =>
  new Promise(r => keys.once('key', (str, key) => r({ str, key })));
export const sleep   = ms => new Promise(r => setTimeout(r, ms));

// Terminal control
export const cls      = () => process.stdout.write('\x1B[2J\x1B[H');
export const hideCur  = () => process.stdout.write('\x1B[?25l');
export const showCur  = () => process.stdout.write('\x1B[?25h');
export const write    = s  => process.stdout.write(s);

// Visual width (emoji = 2, ASCII = 1)
function vw(s) {
  const clean = s.replace(/\x1B\[[0-9;]*m/g, '');
  let w = 0;
  for (const c of clean) {
    const cp = c.codePointAt(0);
    w += (cp > 0x2E80 || (cp >= 0x2600 && cp <= 0x27BF) || (cp >= 0x1F000 && cp <= 0x1FFFF)) ? 2 : 1;
  }
  return w;
}

// Box drawing (W=60 inner)
export const BW = 60;

export function box(title, rows) {
  const border = '═'.repeat(BW + 2);
  const div    = `╠${border}╣`;
  const pad    = Math.max(0, BW - vw(title));
  const lp     = Math.floor(pad / 2);
  const rp     = pad - lp;
  const out    = [
    `╔${border}╗`,
    `║${' '.repeat(lp + 1)}${title}${' '.repeat(rp + 1)}║`,
    div,
  ];
  for (const r of rows) {
    if (r === '---') { out.push(div); continue; }
    const p = Math.max(0, BW - vw(r));
    out.push(`║ ${r}${' '.repeat(p)} ║`);
  }
  out.push(`╚${border}╝`);
  return out.join('\n');
}

export function progressBar(pct, width = 20) {
  const fill = Math.round(pct / 100 * width);
  return '█'.repeat(fill) + '░'.repeat(width - fill);
}