// Kaspa-style address encoder (copied from tools/observer/observer.mjs). Devnet prefix is igneumdev.
const CHARSET = 'qpzry9x8gf2tvdw0s3jn54khce6mua7l';
function polymod(values) {
  let c = 1n;
  for (const d of values) {
    const c0 = c >> 35n;
    c = ((c & 0x07ffffffffn) << 5n) ^ BigInt(d);
    if (c0 & 0x01n) c ^= 0x98f2bc8e61n;
    if (c0 & 0x02n) c ^= 0x79b76d99e2n;
    if (c0 & 0x04n) c ^= 0xf33e5fb3c4n;
    if (c0 & 0x08n) c ^= 0xae2eabe2a8n;
    if (c0 & 0x10n) c ^= 0x1e4f43e470n;
  }
  return c ^ 1n;
}
function conv8to5(bytes) {
  const out = []; let buff = 0, bits = 0;
  for (const b of bytes) {
    buff = ((buff << 8) | b) & 0xffff; bits += 8;
    while (bits >= 5) { bits -= 5; out.push((buff >> bits) & 31); buff &= (1 << bits) - 1; }
  }
  if (bits > 0) out.push((buff << (5 - bits)) & 31);
  return out;
}
export function encodeAddress(prefix, version, payload) {
  const five = conv8to5([version, ...payload]);
  const pre = [...prefix].map(ch => ch.charCodeAt(0) & 0x1f);
  const sum = polymod([...pre, 0, ...five, 0, 0, 0, 0, 0, 0, 0, 0]);
  const sumBytes = []; for (let i = 4; i >= 0; i--) sumBytes.push(Number((sum >> BigInt(i * 8)) & 0xffn));
  return `${prefix}:${[...five, ...conv8to5(sumBytes)].map(v => CHARSET[v]).join('')}`;
}
/// A deterministic devnet pay address for a miner label (32-byte payload from the label).
export function devAddress(label = 'harness') {
  const payload = Array.from({ length: 32 }, (_, i) => (label.charCodeAt(i % label.length) * (i + 1)) & 0xff);
  return encodeAddress('igneumdev', 0, payload);
}