'use strict';
/*global Promise*/

var PEM = require('./pem.js');
var x509 = require('./x509.js');
var ASN1 = require('./asn1.js');

// Hacky-do, wrappy-do
module.exports.generate = function (opts) {
  if (!opts) { opts = {}; }
  return new Promise(function (resolve, reject) {
    try {
      var modlen = opts.modulusLength || 2048;
      var exp = opts.publicExponent || 0x10001;
      var pair = require('./generate-privkey.js')(modlen,exp);
      if (pair.private) { resolve(pair); return; }
      pair = toJwks(pair);
      resolve({ private: pair.private , public: pair.public });
    } catch(e) {
      reject(e);
    }
  });
};

// PKCS1 to JWK only
function toJwks(oldpair) {
  var block = PEM.parseBlock(oldpair.privateKeyPem);
  var asn1 = ASN1.parse(block.bytes);
  var jwk = { kty: 'RSA', n: null, e: null };
  jwk = x509.parsePkcs1(block.bytes, asn1, jwk);
  return { private: jwk, public: neuter(jwk) };
}

// Copied from rsa.js to prevent circular dep
var privates = [ 'p', 'q', 'd', 'dp', 'dq', 'qi' ];
function neuter(priv) {
  var pub = {};
  Object.keys(priv).forEach(function (key) {
    if (!privates.includes(key)) {
      pub[key] = priv[key];
    }
  });
  return pub;
}

if (require.main === module) {
  module.exports.generate().then(function (pair) {
    console.info(JSON.stringify(pair.private, null, 2));
    console.info(JSON.stringify(pair.public, null, 2));
  });
}