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// NoScroll https://github.com/davidtheclark/no-scroll
(function(root) {
  var scrollbarSize;

  function getScrollbarSize() {
    if (typeof scrollbarSize !== 'undefined') return scrollbarSize;

    var doc = document.documentElement;
    var dummyScroller = document.createElement('div');
    dummyScroller.setAttribute('style', 'width:99px;height:99px;'
      + 'position:absolute;top:-9999px;overflow:scroll;');
    doc.appendChild(dummyScroller);
    scrollbarSize = dummyScroller.offsetWidth - dummyScroller.clientWidth;
    doc.removeChild(dummyScroller);
    return scrollbarSize;
  }

  function hasScrollbar() {
    return document.documentElement.scrollHeight > window.innerHeight;
  }

  function on(options) {
    if (typeof document === 'undefined') return;
    var doc = document.documentElement;
    var rightPad = parseInt(getComputedStyle(doc)['padding-right'], 10);
    doc.style.overflow = 'hidden';
    if (hasScrollbar()) {
      rightPad += getScrollbarSize();
      doc.style.paddingRight = rightPad + 'px';
    }
  }

  function off() {
    if (typeof document === 'undefined') return;
    var doc = document.documentElement;
    doc.style.overflow = '';
    doc.style.paddingRight = '';
  }

  var noScroll = {
    on: on,
    off: off,
  };

  if (typeof module !== 'undefined' && typeof module.exports !== 'undefined') {
    module.exports = noScroll;
  }
  else {
    root.noScroll = noScroll;
  }
})(this);