import { getPublicKey, nip19 } from 'nostr-tools'

const HEX64 = /^[0-9a-f]{64}$/

function toBytes(secretHex: string): Uint8Array {
  return Uint8Array.from(Buffer.from(secretHex.trim().toLowerCase(), 'hex'))
}

export function isValidSecretHex(hex: string): boolean {
  return HEX64.test(hex.trim().toLowerCase())
}

// Deterministic secp256k1 x-only public key derivation (no randomness). Throws
// if the secret is not a valid curve scalar.
export function secretHexToPublicHex(secretHex: string): string {
  return getPublicKey(toBytes(secretHex))
}

export function encodeNpub(publicHex: string): string {
  return nip19.npubEncode(publicHex)
}

export function encodeNsec(secretHex: string): string {
  return nip19.nsecEncode(toBytes(secretHex))
}