import getUncompressedPublicKey from "./getUncompressedPublicKey"

async function normalizeSafeSignature(
  signatureHex: string,
  publicKey: string,
  setUtf8Bit: boolean = true,
): Promise<string> {
  // drop the leading 0x
  const signature = signatureHex.slice(2)

  const v = signature.slice(0, 2) // v is the first byte
  // setting the highest bit to execute the UTF-8 validation path if needed
  const vConverted = setUtf8Bit ? (parseInt(v, 16) + 128).toString(16) : v
  const signatureConverted = `${signature.slice(2)}${vConverted}` // move v to the end

  // recover uncompressed public key
  const publicKeyUncompressed = getUncompressedPublicKey(publicKey)

  // prefix the Bitcoin message signature with length as required by Safe.
  const signatureLength = 129n.toString(16)
  return signatureLength.concat(
    signatureConverted,
    `${publicKeyUncompressed}`.substring(2), // Trim the 04 prefix
  )
}

export default normalizeSafeSignature