/** Device-side ids (moved from src/lib/field/client-ops.ts, which re-exports them). */

/** RFC 4122 v4 id; falls back to getRandomValues outside secure contexts. */
export function newClientId(): string {
  const c = globalThis.crypto;
  if (typeof c?.randomUUID === "function") return c.randomUUID();
  const b = new Uint8Array(16);
  c.getRandomValues(b);
  b[6] = (b[6] & 0x0f) | 0x40;
  b[8] = (b[8] & 0x3f) | 0x80;
  const h = [...b].map((x) => x.toString(16).padStart(2, "0")).join("");
  return `${h.slice(0, 8)}-${h.slice(8, 12)}-${h.slice(12, 16)}-${h.slice(16, 20)}-${h.slice(20)}`;
}

const DEVICE_KEY = "craftvia.field.deviceId";

export function deviceId(): string {
  try {
    let id = localStorage.getItem(DEVICE_KEY);
    if (!id) {
      id = newClientId();
      localStorage.setItem(DEVICE_KEY, id);
    }
    return id;
  } catch {
    return "unknown-device";
  }
}