parking_solution/packages/devices/src/drivers/printer-escpos.ts

import { Socket } from "node:net";
import type {
  PrintReport,
  ReceiptData,
  SubscriptionCardData,
  TicketData,
  WindowChargeNoticeData,
} from "../interfaces.js";

// Shared ESC/POS rendering + raw-TCP transport for 80mm thermal printers.
// Rongta RP-series, Cashino, and the many OEM clones all speak ESC/POS over a
// raw TCP socket on port 9100 (the JetDirect/RAW convention) with no auth on the
// print socket — they live on the isolated device VLAN. The BYTE STREAM is
// identical across these clones; what differs is live status reporting (the
// Rongta board serves a decoded status page; the Cashino does not), so status
// stays in each driver while the rendering/transport live here.
// See wiki/entities/rongta-printer.md and wiki/concepts/network-isolation.md.

// --- ESC/POS command bytes ----------------------------------------------------
const ESC = 0x1b;
const GS = 0x1d;
const LF = 0x0a;

const INIT = Buffer.from([ESC, 0x40]); // ESC @  — reset to power-on defaults
const ALIGN_CENTER = Buffer.from([ESC, 0x61, 0x01]); // ESC a 1
const ALIGN_LEFT = Buffer.from([ESC, 0x61, 0x00]); // ESC a 0
const BOLD_ON = Buffer.from([ESC, 0x45, 0x01]); // ESC E 1
const BOLD_OFF = Buffer.from([ESC, 0x45, 0x00]); // ESC E 0
const DOUBLE_ON = Buffer.from([GS, 0x21, 0x11]); // GS ! — double width+height
const DOUBLE_OFF = Buffer.from([GS, 0x21, 0x00]);
const FEED_AND_CUT = Buffer.from([ESC, 0x64, 0x04, GS, 0x56, 0x42, 0x00]); // feed 4, GS V B 0 partial cut

// Select code page 852 (Latin-2) for the character set: ESC t n, n=18 (0x12).
// CP852 carries the Albanian letters we print (ë, ç, …); without it the printer
// would interpret our high bytes as CP437 glyphs. Sent in every print's INIT
// preamble. See wiki/concepts/site-metadata.md (i18n / codepage).
const SELECT_CP852 = Buffer.from([ESC, 0x74, 0x12]);

// Minimal Unicode → CP852 byte map for the characters Albanian text actually uses
// beyond ASCII. Anything not listed is transliterated to an ASCII fallback (below)
// so we never emit a byte that renders as the wrong glyph. Extend as needed.
const CP852: Record<string, number> = {
  ë: 0x89,
  Ë: 0xd3, // CP852 0xD3 = U+00CB Ë (0xEB is ű — wrong; fixed after a misprint)
  ç: 0x87,
  Ç: 0x80,
  // common Latin-2 extras that may appear in a park name/address:
  ä: 0x84,
  ö: 0x94,
  ü: 0x81,
  é: 0x82,
  á: 0xa0,
  í: 0xa1,
  ó: 0xa2,
  ú: 0xa3,
};
// ASCII transliteration for any char with no CP852 mapping (last-resort, so an
// odd glyph degrades to a readable letter rather than garbage).
const ASCII_FALLBACK: Record<string, string> = {
  ë: "e",
  Ë: "E",
  ç: "c",
  Ç: "C",
  ä: "a",
  ö: "o",
  ü: "u",
  é: "e",
  á: "a",
  í: "i",
  ó: "o",
  ú: "u",
  // Typographic punctuation that creeps in from composed strings — CP852 has no
  // em/en dash, ellipsis, curly quotes, or the warning sign, so without these they
  // print as "?" (the cause of the "PARKIM ? JASHTË ORARIT" misprint). Degrade to
  // the obvious ASCII equivalent rather than a literal "?".
  "—": "-", // em dash U+2014
  "–": "-", // en dash U+2013
  "…": "...", // ellipsis U+2026
  "‘": "'",
  "’": "'",
  "“": '"',
  "”": '"',
  "⚠": "!", // warning sign U+26A0 — no glyph on a thermal head; "!" reads as a flag
  "•": "*",
};

/** Encode one line of text to CP852 bytes + a line feed. ASCII (<0x80) passes
 *  through; mapped chars use their CP852 byte; unmapped non-ASCII falls back to an
 *  ASCII letter. Pair with SELECT_CP852 in the print preamble. */
function line(text = ""): Buffer {
  const out: number[] = [];
  // Intl.NumberFormat separates the amount from the currency with a NO-BREAK
  // SPACE (U+00A0) or NARROW NO-BREAK SPACE (U+202F); neither is in CP852, so
  // they'd print as "?". Normalise to a plain space (e.g. "1000 Lekë").
  const normalised = text.replace(/[  ]/g, " ");
  for (const ch of normalised) {
    const code = ch.codePointAt(0) ?? 0;
    const mapped = CP852[ch];
    const fallback = ASCII_FALLBACK[ch];
    if (code < 0x80) {
      out.push(code);
    } else if (mapped !== undefined) {
      out.push(mapped);
    } else if (fallback !== undefined) {
      out.push(...Buffer.from(fallback, "ascii"));
    } else {
      out.push(0x3f); // "?" — unknown char, never a wrong glyph
    }
  }
  out.push(LF);
  return Buffer.from(out);
}

// --- Scannable symbol (printer-generated, no image rendering) -----------------
// The ticket id is the session key (wiki/concepts/ticket-encoding.md). We print it
// as a 1D Code128 barcode so ANY legacy laser barcode scanner the booth might have
// can read it. The barcode is rendered by the printer board from these ESC/POS
// commands — we send the data, the firmware draws the bars (no bitmap, no
// dependency). The same code is printed as large human-readable digits below, so
// the operator can hand-key it if every reader fails.

/** GS k — Code128 1D barcode. Height/width set first, then HRI off, then data.
 *  `moduleWidth` (narrow-bar dots, 1–6) trades scan-tolerance for total width: at ~11
 *  modules/char a 13-char id fits 80mm (576 printable dots) at width 3, but a ~20-char
 *  id needs width 2 or it OVERFLOWS the head and the firmware silently aborts the
 *  barcode (prints nothing). Keep the symbol LEFT-aligned — centering shifts the start
 *  point right and makes a wide barcode overflow even sooner. */
function code128(data: string, moduleWidth = 3): Buffer {
  // Code128 code set B (printable ASCII) — prefix the data with the {B selector.
  const payload = Buffer.from(`{B${data}`, "ascii");
  const w = Math.max(1, Math.min(6, moduleWidth));
  return Buffer.concat([
    ALIGN_LEFT, // a wide barcode must start at the left margin to fit the 80mm head
    Buffer.from([GS, 0x68, 0x64]), // GS h 100 — barcode height = 100 dots (taller = tolerant of scan angle)
    Buffer.from([GS, 0x77, w]), // GS w n — module (narrow-bar) width in dots
    Buffer.from([GS, 0x48, 0x00]), // GS H 0  — HRI text off (we print the id ourselves)
    // GS k 73 n <data>  — function B form: 73 = Code128, n = data byte length.
    Buffer.from([GS, 0x6b, 0x49, payload.length]),
    payload,
  ]);
}

// --- 2D QR symbol (printer-generated via ESC/POS GS ( k) -----------------------
// A true QR for the SUBSCRIPTION card — the subscriber scans it at the reader (which
// reads QR + 1D barcode) every entry/exit for the coverage period. The board renders
// the QR from these GS ( k commands (no bitmap, no dependency), same approach as
// code128. We also print the code as text below as the hand-key fallback.

/** A QR code via ESC/POS `GS ( k`. `size` = module dot size (1–16; 6 ≈ readable on
 *  80mm at short range). Error-correction level M (15%) — robust to a smudged print. */
function qrCode(data: string, size = 6): Buffer {
  const bytes = Buffer.from(data, "ascii");
  // pL/pH encode the data length + 3 (the cn,fn,m header bytes) for function 180.
  const store = bytes.length + 3;
  const pL = store & 0xff;
  const pH = (store >> 8) & 0xff;
  return Buffer.concat([
    // fn 165: select QR model — 1d 28 6b 04 00 31 41 <model=50(2)> 00
    Buffer.from([GS, 0x28, 0x6b, 0x04, 0x00, 0x31, 0x41, 0x32, 0x00]),
    // fn 167: module size — 1d 28 6b 03 00 31 43 <size>
    Buffer.from([GS, 0x28, 0x6b, 0x03, 0x00, 0x31, 0x43, size]),
    // fn 169: error correction level — 1d 28 6b 03 00 31 45 <49=M>
    Buffer.from([GS, 0x28, 0x6b, 0x03, 0x00, 0x31, 0x45, 0x31]),
    // fn 180: store the symbol data — 1d 28 6b pL pH 31 50 30 <data>
    Buffer.from([GS, 0x28, 0x6b, pL, pH, 0x31, 0x50, 0x30]),
    bytes,
    // fn 181: print the stored symbol — 1d 28 6b 03 00 31 51 30
    Buffer.from([GS, 0x28, 0x6b, 0x03, 0x00, 0x31, 0x51, 0x30]),
  ]);
}

// Ticket/receipt strings — Albanian (the site prints in Albanian for now). Kept in
// one place so a real i18n layer (per-locale tables + a t() helper) can replace this
// later without touching the render functions. See wiki/concepts/site-metadata.md.
const STR = {
  /** NIUS label prefix; printed only when the park has a NIUS. */
  nius: (v: string) => `NIUS: ${v}`,
  /** "Printed at:" — precedes the issue timestamp. */
  issuedAt: (v: string) => `Printuar më: ${v}`,
  /** Subscription-card title. */
  subscription: "ABONIM",
  /** "Holder: <name>" line on the card. */
  holder: (name: string) => `Mbajtësi: ${name}`,
  /** "Valid: <from> – <to>" line on the card. */
  validity: (from: string, to: string) => `Vlen: ${from} – ${to}`,
  phone: (v: string) => `TEL: ${v}`,
  // --- payment receipt ---
  /** Receipt title. */
  receipt: "FATURË PAGESE",
  /** Voucher-mode title (the same slip self-exits). */
  voucherTitle: "BILETË DALJE",
  /** "Entry:" — entry time row. */
  entry: (v: string) => `Hyrja:    ${v}`,
  /** "Paid:" — payment time row. */
  paid: (v: string) => `Pagesa:   ${v}`,
  /** "Duration:" — time parked. */
  duration: (v: string) => `Kohëzgjatja: ${v}`,
  /** "Tender:" — cash/card. */
  tender: (v: string) => `Mënyra:   ${v}`,
  tenderCash: "Para në dorë",
  tenderCard: "Kartë",
  /** "Paid:" amount label (precedes the large total). */
  amountLabel: "PAGUAR",
  /** Walk-back grace emphasis (voucher mode) — two short lines that each fit the
   *  80mm width, so neither wraps mid-word. */
  graceLines: (min: number): readonly string[] => [
    `Dilni brenda ${min} min.`,
    "Skanoni këtë biletë në dalje.",
  ],
  /** Thank-you footer. */
  thanks: "Faleminderit!",
  // --- out-of-window advisory slip (subscriber) ---
  /** Slip title. ASCII dash (not em dash) so no codepage surprise. */
  windowTitle: "PARKIM - JASHTË ORARIT",
  /** "Subscriber: <name>" line. */
  windowHolder: (name: string) => `Abonent: ${name}`,
  /** Entry-edge line; appends the window-open time when known. */
  windowEnteredEarly: (opensHHMM?: string) =>
    opensHHMM ? `Ka hyrë jashtë orarit (orari hap ${opensHHMM})` : "Ka hyrë jashtë orarit",
  /** Exit-edge line. */
  windowExitedLate: "Ka dalë jashtë orarit",
  /** "Entry:" / "Exit:" stamp label per edge. */
  windowStamp: (edge: "entry" | "exit", v: string) => (edge === "entry" ? `Hyrja: ${v}` : `Dalja: ${v}`),
  /** Two short lines (each fits 80mm) telling the customer a fee is pending and
   *  is settled at the booth before exit. ASCII "!" flag (no glyph for ⚠). */
  windowPending: ["! Detyrim do të llogaritet në dalje", "  (paguhet në kabinë para se të dilni)"] as const,
} as const;

/** Format integer minor units + ISO-4217 currency as a major-unit string for the
 *  printed receipt. Mirrors the booth UI's formatMoney (no float money model). */
function money(amountMinor: number, currency: string): string {
  const major = amountMinor / 100;
  try {
    return new Intl.NumberFormat("sq-AL", {
      style: "currency",
      currency,
    }).format(major);
  } catch {
    return `${major.toFixed(2)} ${currency}`;
  }
}

/** Human duration between two ISO times, e.g. "2h 14m" / "47m". Whole minutes,
 *  mirroring the booth UI's formatDuration. */
function duration(fromIso: string, toIso: string): string {
  const ms = Date.parse(toIso) - Date.parse(fromIso);
  if (!Number.isFinite(ms) || ms < 0) return "—";
  const mins = Math.floor(ms / 60_000);
  const h = Math.floor(mins / 60);
  const m = mins % 60;
  return h > 0 ? `${h}h ${m}m` : `${m}m`;
}

/** Albanian month names (customer-facing receipts are always Albanian — see
 *  i18n.md). Indexed by Date.getMonth() (0 = Janar). */
const SQ_MONTHS = [
  "Janar",
  "Shkurt",
  "Mars",
  "Prill",
  "Maj",
  "Qershor",
  "Korrik",
  "Gusht",
  "Shtator",
  "Tetor",
  "Nëntor",
  "Dhjetor",
] as const;

/** Human local date+time for a receipt row, e.g. "19 Qershor 2026 10:48:25". The
 *  host clock is the site's local time (the appliance runs in the site's zone);
 *  24-hour with seconds (Albania uses 24h). Falls back to the raw ISO on a bad date.
 *  Exported (as formatStampSq) so other server-side printed output — e.g. the shift
 *  Z-report — shares one Albanian date format. */
export function stamp(iso: string): string {
  const d = new Date(iso);
  if (Number.isNaN(d.getTime())) return iso;
  const p = (n: number) => String(n).padStart(2, "0");
  const date = `${d.getDate()} ${SQ_MONTHS[d.getMonth()]} ${d.getFullYear()}`;
  const time = `${p(d.getHours())}:${p(d.getMinutes())}:${p(d.getSeconds())}`;
  return `${date} ${time}`;
}

/** Date-only Albanian format "19 Qershor 2026" (for subscription validity dates,
 *  which are date strings with no time). Passes through a non-date value unchanged. */
function dateOnly(value: string): string {
  const d = new Date(value);
  if (Number.isNaN(d.getTime())) return value;
  return `${d.getDate()} ${SQ_MONTHS[d.getMonth()]} ${d.getFullYear()}`;
}

/** Build the ESC/POS byte stream for a free-form text report (e.g. shift Z-report). */
export function renderReport(report: PrintReport): Buffer {
  return Buffer.concat([
    INIT,
    SELECT_CP852,
    ALIGN_CENTER,
    BOLD_ON,
    line(report.title),
    BOLD_OFF,
    ALIGN_LEFT,
    line(),
    ...report.lines.map((l) => line(l)),
    FEED_AND_CUT,
  ]);
}

/** Render the park-identity header from site metadata. Prints the park name large
 *  (or "PARKING" if unset), then operator / NIUS / address lines that are present.
 *  NIUS and the rest only print when set. Non-ASCII renders via CP852 (see line()). */
function renderHeader(h: TicketData["header"]): Buffer {
  const parts: Buffer[] = [
    ALIGN_CENTER,
    BOLD_ON,
    DOUBLE_ON,
    line(h?.parkName || "PARKING"),
    DOUBLE_OFF,
    BOLD_OFF,
  ];
  if (h?.operatorName) parts.push(line(h.operatorName));
  if (h?.nius) parts.push(line(STR.nius(h.nius)));
  if (h?.address) {
    // Address may be multi-line; print each line centered.
    for (const ln of h.address.split(/\r?\n/))
      if (ln.trim()) parts.push(line(ln.trim()));
  }
  if (h?.phone) parts.push(line(STR.phone(h.phone)));
  return Buffer.concat(parts);
}

/** Build the full ESC/POS byte stream for an entry ticket.
 *  Header (park identity) → 1D Code128 barcode of the ticket id → the id in large
 *  digits → issue time. Code128 is read by ANY legacy 1D barcode scanner the booth
 *  might have; the printed digits are the fallback if every reader fails (operator
 *  hand-keys the all-numeric code). Text is Albanian.
 *  See wiki/concepts/ticket-encoding.md and site-metadata.md. */
export function renderTicket(data: TicketData): Buffer {
  return Buffer.concat([
    INIT,
    SELECT_CP852,
    renderHeader(data.header),
    line(),
    // The scannable barcode + the same code in large human-readable digits.
    code128(data.ticketId),
    line(),
    BOLD_ON,
    DOUBLE_ON,
    line(data.ticketId),
    DOUBLE_OFF,
    BOLD_OFF,
    line(),
    line(STR.issuedAt(stamp(data.issuedAt))),
    FEED_AND_CUT,
  ]);
}

/** Build the ESC/POS byte stream for a SUBSCRIPTION CARD: park header → a scannable
 *  QR of the code → the code in text (hand-key fallback) → holder + validity window.
 *  The subscriber keeps this and scans the QR at the reader every entry/exit. */
export function renderSubscriptionCard(data: SubscriptionCardData): Buffer {
  const parts: Buffer[] = [
    INIT,
    SELECT_CP852,
    renderHeader(data.header),
    line(),
    BOLD_ON,
    line(STR.subscription),
    BOLD_OFF,
    line(),
    ALIGN_CENTER,
    qrCode(data.code),
    line(),
    // The code in text, as the fallback if the QR won't scan.
    line(data.code),
    ALIGN_LEFT,
    line(),
  ];
  if (data.holderName) parts.push(line(STR.holder(data.holderName)));
  if (data.validFrom || data.validTo) {
    parts.push(
      line(STR.validity(data.validFrom ? dateOnly(data.validFrom) : "—", data.validTo ? dateOnly(data.validTo) : "—")),
    );
  }
  parts.push(FEED_AND_CUT);
  return Buffer.concat(parts);
}

/** Build the ESC/POS byte stream for a PAYMENT RECEIPT. Header → title → the
 *  transparency figures (entry / paid / duration / amount / tender). In voucher
 *  mode it ALSO prints the scannable ticket-id barcode and emphasises the
 *  walk-back grace, so the one slip both proves payment and self-exits at a
 *  distant exit reader. Standalone (voucher=false) is detail-only. Albanian. */
export function renderReceipt(data: ReceiptData): Buffer {
  const parts: Buffer[] = [
    INIT,
    SELECT_CP852,
    renderHeader(data.header),
    line(),
    ALIGN_CENTER,
    BOLD_ON,
    DOUBLE_ON,
    line(data.voucher ? STR.voucherTitle : STR.receipt),
    DOUBLE_OFF,
    BOLD_OFF,
    line(),
    ALIGN_LEFT,
    // The transparency figures.
    line(STR.entry(stamp(data.enteredAt))),
    line(STR.paid(stamp(data.paidAt))),
    line(STR.duration(duration(data.enteredAt, data.paidAt))),
    line(
      STR.tender(data.tender === "card" ? STR.tenderCard : STR.tenderCash),
    ),
    line(),
    // The amount, large and centred.
    ALIGN_CENTER,
    line(STR.amountLabel),
    BOLD_ON,
    DOUBLE_ON,
    line(money(data.amountMinor, data.currency)),
    DOUBLE_OFF,
    BOLD_OFF,
    line(),
  ];

  if (data.voucher) {
    // The same ticket id, scannable at the exit reader, + the grace emphasis. code128
    // forces ALIGN_LEFT (a wide barcode must hug the margin); restore centering for the
    // human-readable id + grace lines that follow.
    parts.push(
      code128(data.ticketId),
      ALIGN_CENTER,
      line(),
      line(data.ticketId),
      line(),
    );
    if (data.graceExitMin != null && data.graceExitMin > 0) {
      parts.push(
        BOLD_ON,
        ...STR.graceLines(data.graceExitMin).map((l) => line(l)),
        BOLD_OFF,
      );
    }
  }

  parts.push(line(), line(STR.thanks), FEED_AND_CUT);
  return Buffer.concat(parts);
}

/** Build the ESC/POS byte stream for the ADVISORY out-of-window slip. Header →
 *  title → a SCANNABLE Code128 + QR of the occurrence id (so the operator scans it
 *  straight into the booth pay modal — same path as a transient ticket) → the id in
 *  text (hand-key fallback) → holder + entry/exit stamp → the "pay at booth" notice.
 *  Carries NO amount (the booth quotes the combined charge at settlement). Albanian. */
export function renderWindowChargeNotice(data: WindowChargeNoticeData): Buffer {
  const hhmm = (m?: number | null) =>
    m == null ? undefined : `${String(Math.floor(m / 60)).padStart(2, "0")}:${String(m % 60).padStart(2, "0")}`;
  const parts: Buffer[] = [
    INIT,
    SELECT_CP852,
    renderHeader(data.header),
    line(),
    ALIGN_CENTER,
    BOLD_ON,
    line(STR.windowTitle),
    BOLD_OFF,
    line(),
    // The occurrence id, scannable two ways. Code128 for a 1D laser scanner FIRST —
    // module width 2 + left-aligned (code128 forces ALIGN_LEFT) because the ~20-char
    // occurrence id is too wide to fit the 80mm head at width 3 (the firmware would
    // abort it). Then the QR for the booth's combo reader. Either pulls the occurrence
    // up in the pay modal.
    code128(data.occurrenceId, 2),
    line(),
    ALIGN_CENTER,
    qrCode(data.occurrenceId),
    line(),
    // The id in text, as the hand-key fallback if neither scans.
    line(data.occurrenceId),
    ALIGN_LEFT,
    line(),
  ];
  if (data.holderName) parts.push(line(STR.windowHolder(data.holderName)));
  parts.push(line(STR.windowStamp(data.edge, stamp(data.at))));
  parts.push(
    line(data.edge === "entry" ? STR.windowEnteredEarly(hhmm(data.windowOpensMin)) : STR.windowExitedLate),
    line(),
    BOLD_ON,
    ...STR.windowPending.map((l) => line(l)),
    BOLD_OFF,
    FEED_AND_CUT,
  );
  return Buffer.concat(parts);
}

/** Open a TCP socket, write the bytes, and close GRACEFULLY so the printer reads the
 *  whole stream before the connection tears down.
 *
 *  Why not write-then-destroy: a Socket.write() callback fires when the data reaches
 *  the local kernel buffer, NOT when the peer has read it. Calling destroy() at that
 *  point sends a TCP RST that can truncate the job in flight — the printer then has a
 *  desynced ESC/POS stream and prints raster garbage (solid black bars / banding).
 *  Instead we `end(payload)` (write + FIN) and wait for the socket to fully close,
 *  which only happens after the peer has drained our bytes and the FIN is acked. */
export function sendRaw(
  host: string,
  port: number,
  payload: Buffer,
  timeoutMs: number,
): Promise<void> {
  return new Promise((resolve, reject) => {
    const sock = new Socket();
    let settled = false;
    // True once the payload + FIN have been handed off (flushed locally). After this,
    // we've done our part; a slow/absent peer-FIN should NOT fail an already-sent job.
    let written = false;
    const fail = (err: Error) => {
      if (settled) return;
      settled = true;
      sock.destroy();
      reject(err);
    };
    const succeed = () => {
      if (settled) return;
      settled = true;
      sock.destroy();
      resolve();
    };
    sock.setTimeout(timeoutMs);
    // A timeout BEFORE the bytes are out is a real failure; one AFTER (some printers
    // never send their FIN, holding the socket open) means the job was delivered —
    // succeed rather than reject a ticket that already printed.
    sock.on("timeout", () => (written ? succeed() : fail(new Error("timeout"))));
    sock.on("error", fail);
    // `close` fires after the bytes are flushed AND the connection is fully torn down
    // (our FIN sent, peer's FIN received) — the job has been delivered by then.
    sock.on("close", (hadError) => (hadError ? undefined : succeed()));
    sock.connect(port, host, () => {
      // end() writes the payload then sends FIN — a graceful half-close that lets the
      // printer finish reading before the socket closes. No abrupt destroy(). The
      // write callback confirms the bytes left our buffer.
      sock.end(payload, () => {
        written = true;
      });
    });
  });
}

/** TCP connect probe — reachability of the raw print socket. The print socket has
 *  no status protocol we rely on, so this is the floor for any ESC/POS printer:
 *  it answers "is the printer reachable", not "is it out of paper". */
export function probe(
  host: string,
  port: number,
  timeoutMs: number,
): Promise<void> {
  return new Promise((resolve, reject) => {
    const sock = new Socket();
    let settled = false;
    const done = (err?: Error) => {
      if (settled) return;
      settled = true;
      sock.destroy();
      err ? reject(err) : resolve();
    };
    sock.setTimeout(timeoutMs);
    sock.on("timeout", () => done(new Error("timeout")));
    sock.on("error", done);
    sock.connect(port, host, () => done());
  });
}

// --- shared driver config fields ----------------------------------------------
// Role + failover are identical across ESC/POS printers; defined here so each
// driver shares them. See wiki/concepts/printer-roles-failover.md.
export type PrinterRole = "entry-dispenser" | "booth-receipt";