(function(exports){

  function minigrid(containerselector, itemselector, gutter, animate, done) {
    var foreach = array.prototype.foreach;
    var containerele = document.queryselector(containerselector);
    var itemsnodelist = document.queryselectorall(itemselector);
    gutter = gutter || 0;
    containerele.style.width = '';
    var containerwidth = containerele.getboundingclientrect().width;
    var firstchildwidth = itemsnodelist[0].getboundingclientrect().width + gutter;
    var cols = math.max(math.floor((containerwidth - gutter) / firstchildwidth), 1);
    var count = 0;
    containerwidth = (firstchildwidth * cols + gutter) + 'px';
    containerele.style.width = containerwidth;
    
    for (var itemsgutter = [], itemsposx = [], g = 0; g < cols; g++) {
      itemsposx.push(g * firstchildwidth + gutter);
      itemsgutter.push(gutter);
    }

    foreach.call(itemsnodelist, function(item){
      var itemindex = itemsgutter.slice(0).sort(function (a, b) {
        return a - b;
      }).shift();
      itemindex = itemsgutter.indexof(itemindex);
      var posx = itemsposx[itemindex];
      var posy = itemsgutter[itemindex];
      var transformprops = [
        'webkittransform', 
        'moztransform', 
        'mstransform',
        'otransform', 
        'transform'
      ];
      if (!animate) {
        foreach.call(transformprops, function(transform){
          item.style[transform] = 'translate(' + posx + 'px,' + posy + 'px)';
        });  
      }
      itemsgutter[itemindex] += item.getboundingclientrect().height + gutter;
      count = count + 1;
      if (animate) {
        return animate(item, posx, posy, count);
      }
    });

    var containerheight = itemsgutter.slice(0).sort(function (a, b) {
      return a - b;
    }).pop();

    containerele.style.height = containerheight + 'px';

    if (typeof done === 'function'){
      done();
    }
  }

  if (typeof define === 'function' && define.amd) {
    define(function() { return minigrid; });
  } else if (typeof module !== 'undefined' && module.exports) {
    module.exports = minigrid;
  } else {
    exports.minigrid = minigrid;
  }

})(this);