(function collonadeClosure() {
  'use strict';

  window.utils = window.utils || {};

  var JS_INITIALIZED_CLASS = 'js-initialized';
  var CHECKBOX_SELECTOR = '.checkbox';

  window.utils.checkAll = function(wrapper, options) {

    if (!wrapper || wrapper.classList.contains(JS_INITIALIZED_CLASS)) {
      return false;
    }
    options = options || {};

    var columns = [];

    function init() {

      columns = gatherColumns(wrapper);

      var checkboxColumn = findCheckboxColumn(columns);
      if (checkboxColumn) {
        setup(checkboxColumn);
      }
    }

    function gatherColumns(table) {
      var rows = Array.from(table.querySelectorAll('tr'));
      var cols = [];
      rows.forEach(function(tr) {
        var cells = Array.from(tr.querySelectorAll('td'));
        cells.forEach(function(cell, iCell) {
          if (!cols[iCell]) {
            cols[iCell] = [];
          }
          cols[iCell].push(cell);
        });
      });
      return cols;
    }

    function findCheckboxColumn(cols) {
      var checkboxColumn = null;
      cols.forEach(function(col, i) {
        if (isCheckboxColumn(col)) {
          checkboxColumn = i;
        }
      });
      return checkboxColumn;
    }

    function isCheckboxColumn(col) {
      var onlyCheckboxes = true;
      col.forEach(function(cell) {
        console.log('checking', cell);
        if (onlyCheckboxes && !cell.querySelector(CHECKBOX_SELECTOR)) {
          onlyCheckboxes = false;
        }
      });
      return onlyCheckboxes;
    }

    function setup(column) {
      console.log('setting up column', column);
    }

    init();
  };
})();