/**
 * QR code generation for key display (pk = private key, pb = public key).
 * Uses qrcode package from CDN.
 */
import QRCode from "https://esm.sh/qrcode?bundle";

const DEFAULT_SIZE = 180;
const DARK = "#0f172a";
const LIGHT = "#ffffff";

/**
 * Generate a QR code data URL for the given text.
 * @param {string} text - Text to encode (e.g. public key or private key).
 * @param {{ size?: number, dark?: string, light?: string }} [opts] - Options.
 * @returns {Promise<string>} Data URL for use as img src.
 */
export async function toDataURL(text, opts = {}) {
  const size = opts.size ?? DEFAULT_SIZE;
  const color = { dark: opts.dark ?? DARK, light: opts.light ?? LIGHT };
  return QRCode.toDataURL(text, { width: size, margin: 2, color });
}