// {signature}

const bscript = require('../../script')
const typeforce = require('typeforce')

function check (script) {
  const chunks = bscript.decompile(script)

  return chunks.length === 1 &&
    bscript.isCanonicalScriptSignature(chunks[0])
}
check.toJSON = function () { return 'pubKey input' }

function encodeStack (signature) {
  typeforce(bscript.isCanonicalScriptSignature, signature)
  return [signature]
}

function encode (signature) {
  return bscript.compile(encodeStack(signature))
}

function decodeStack (stack) {
  typeforce(typeforce.Array, stack)
  typeforce(check, stack)
  return stack[0]
}

function decode (buffer) {
  const stack = bscript.decompile(buffer)
  return decodeStack(stack)
}

module.exports = {
  check: check,
  decode: decode,
  decodeStack: decodeStack,
  encode: encode,
  encodeStack: encodeStack
}