var active_filters = {};

function toggle_filter(id) {
  if (active_filters[id] === undefined) { active_filters[id] = false; }
  active_filters[id] = !active_filters[id];

  var any_filters_active = false;
  for (var key in active_filters) {
    if (active_filters[key] === true) {
      any_filters_active = true; break;
    }
  }

  var rows = document.getElementsByClassName('data-row');
  for (var i = 0, il = rows.length; i < il; ++i) {
    if (any_filters_active) {
      var filter_active = false;
      for (var key in active_filters) {
        if (active_filters[key] === true) {
          if (rows[i].hasClassName(key)) {
            filter_active = true; break;
          }
        }
      }
      if (filter_active) {
        Element.show(rows[i]);
      } else {
        Element.hide(rows[i]);
      }
    } else {
      Element.show(rows[i]);
    }
  }

  for (var key in active_filters) {
    var target = $(key);
    if (active_filters[key] === true) {
      if (!Element.hasClassName(target, 'enabled')) { Element.addClassName(target, 'enabled'); }
    } else {
      if (Element.hasClassName(target, 'enabled')) { Element.removeClassName(target, 'enabled'); }
    }
  }
}

function setup_status_togglers() {
  var togglers = document.getElementsByClassName('toggler');
  for (var i = 0; i < togglers.length; ++i) {
    Event.observe(togglers[i], 'click', function(e) {
      var element = Event.element(e);
      toggle_filter(element.id);
    });
  }
}