var COMMENT_HASH_TAG = '//HASH:';

var CollectionUtil = Packages.me.hatter.tools.commons.collection.CollectionUtil;

var __containsCommentHashTag = (list) => {
  for (var i = (list.size() - 1); i >= 0; i--) {
    var l = list.get(i);
    if ($STR(l.trim()) != '') {
      return l.startsWith(COMMENT_HASH_TAG);
    }
  }
  return false;
};

var __getDigestJSON = (list) => {
  var digestJSON = null;
  if (__containsCommentHashTag(list)) {
    var last = CollectionUtil.last(list);
    while ((list.size() > 0) && ($STR(last.trim()) == '')) { CollectionUtil.removeLast(list); last = CollectionUtil.last(list); }
    if (last.startsWith(COMMENT_HASH_TAG)) {
      CollectionUtil.removeLast(list);
      digestJSON = JSON.parse(last.substring(COMMENT_HASH_TAG.length));
    }
  }
  return digestJSON;
};

var __calcSHA256Hex = (list) => {
  return $STR($$.digests().sha256().digest($$.bytes($ARR(list).join('\n'))).asHex());
};

var __checkSHA256 = (list) => {
  var digestJSON = __getDigestJSON(list);
  return digestJSON && (digestJSON.SHA256 == __calcSHA256Hex(list));
};

var checkBytesSHA256 = (bytes) => {
  return __checkSHA256(bytes.list());
};

if (typeof exports == 'object') {
  exports.__containsCommentHashTag = __containsCommentHashTag;
  exports.__getDigestJSON = __getDigestJSON;
  exports.__calcSHA256Hex = __calcSHA256Hex;
  exports.__checkSHA256 = __checkSHA256;
  exports.COMMENT_HASH_TAG = COMMENT_HASH_TAG;
  exports.checkBytesSHA256 = checkBytesSHA256;
}