// Copyright 2016-2018 AJ ONeal. All rights reserved
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
'use strict';

var certInfo = module.exports;
module.exports.certpem = certInfo;

// ES5 version of mergeDeep
// https://stackoverflow.com/questions/27936772/how-to-deep-merge-instead-of-shallow-merge
/**
 * Simple object check.
 * @param item
 * @returns {boolean}
 */
function isObject(item) {
  return (item && typeof item === 'object' && !Array.isArray(item));
}

/**
 * Deep merge two objects.
 * @param target
 * @param ...sources
 */
function merge(target) {
  var sources = Array.prototype.slice.call(arguments);
  sources.shift();
  if (!sources.length) { return target; }
  var source = sources.shift();
  var obj;

  if (isObject(target) && isObject(source)) {
    Object.keys(source).forEach(function (key) {
      if (isObject(source[key])) {
        if (!target[key]) { obj = {}; obj[key] = {}; Object.assign(target, obj); }
        merge(target[key], source[key]);
      } else {
        obj = {}; obj[key] = source[key];
        Object.assign(target, obj);
      }
    });
  }

  sources.unshift(target);
  return merge.apply(null, sources);
}

var common = require("asn1js/org/pkijs/common");
var _asn1js = require("asn1js");
var _pkijs = require("pkijs");
var _x509schema = require("pkijs/org/pkijs/x509_schema");

// #region Merging function/object declarations for ASN1js and PKIjs
var asn1js = merge(_asn1js, common);

var x509schema = merge(_x509schema, asn1js);

var pkijs_1 = merge(_pkijs, asn1js);
var pkijs = merge(pkijs_1, x509schema);

// this is really memory expensive to do
// (about half of a megabyte of loaded code)
certInfo._pemToBinAb  = function (pem) {
  var b64 = pem.replace(/(-----(BEGIN|END) CERTIFICATE-----|[\n\r])/g, '');
  var buf = Buffer.from(b64, 'base64');
  var ab = new Uint8Array(buf).buffer;          // WORKS
  //var ab = buf.buffer                         // Doesn't work

  return ab;
};
certInfo.debug = certInfo.getCertInfo = function (pem) {
  var ab = module.exports._pemToBinAb(pem);

  var asn1 = pkijs.org.pkijs.fromBER(ab);
  var certSimpl = new pkijs.org.pkijs.simpl.CERT({ schema: asn1.result });

  return certSimpl;
};

certInfo.info = certInfo.getBasicInfo = function (pem) {
  var c = certInfo.getCertInfo(pem);
  var domains = [];
  var sub;

  c.extensions.forEach(function (ext) {
    if (ext.parsedValue && ext.parsedValue.altNames) {
      ext.parsedValue.altNames.forEach(function (alt) {
        domains.push(alt.Name);
      });
    }
  });

  sub = c.subject.types_and_values[0].value.value_block.value || null;

  return {
    subject: sub
  , altnames: domains
    // for debugging during console.log
    // do not expect these values to be here
  , _issuedAt: c.notBefore.value
  , _expiresAt: c.notAfter.value
  , issuedAt: new Date(c.notBefore.value).valueOf()
  , expiresAt: new Date(c.notAfter.value).valueOf()
  };
};

certInfo.getCertInfoFromFile = function (pemFile) {
  return require('fs').readFileSync(pemFile, 'ascii');
};

/*
certInfo.testGetCertInfo = function (pathname) {
  var path = require('path');
  var pemFile = pathname || path.join(__dirname, '..', 'tests', 'example.cert.pem');
  return certInfo.getCertInfo(certInfo.getCertInfoFromFile(pemFile));
};

certInfo.testBasicCertInfo = function (pathname) {
  var path = require('path');
  var pemFile = pathname || path.join(__dirname, '..', 'tests', 'example.cert.pem');
  return certInfo.getBasicInfo(certInfo.getCertInfoFromFile(pemFile));
};
*/