function ConferenceManager() {
var mgr = this;
mgr.bootcamp = jQuery('#price_4_4');
mgr.pioneerAwards = jQuery('#price_4_6');
mgr.mainConference = jQuery('#price_4_7');
mgr.specialistRoundTables = jQuery('#price_4_8');

// Main conference is checked by default, but bootcamp is not.
mgr.mainConferenceChecked = true; // mgr.mainConference.defaultChecked is undefined
mgr.bootcampChecked = false;
mgr.changing = false;

mgr.bootcamp.change(function () {
  if (mgr.changing) {
    mgr.changing = false;
  } else {
    if (document.getElementById('price_4_4').checked) {
      mgr.bootcampChecked = true;
    } else {
      mgr.bootcampChecked = false;
      if (!mgr.mainConferenceChecked) {
        mgr.pioneerAwards.prop('checked', false);
        mgr.specialistRoundTables.prop('checked', false);
      }
    }
  }
});

mgr.pioneerAwards.change(function () {
  if (this.checked) {
    // Main conference is checked
    if (!mgr.mainConferenceChecked && !mgr.bootcampChecked) {
      mgr.changing = true;
      mgr.mainConferenceChecked = true;
      mgr.mainConference.click();
    }
  }
});

mgr.mainConference.change(function () {
  if (mgr.changing) {
    mgr.changing = false;
  } else {
    if (document.getElementById('price_4_7').checked) {
      mgr.mainConferenceChecked = true;
    } else {
      mgr.mainConferenceChecked = false;
      if (!mgr.bootcampChecked) {
        mgr.pioneerAwards.prop('checked', false);
        mgr.specialistRoundTables.prop('checked', false);
      }
    }
  }
});

mgr.specialistRoundTables.change(function () {
  if (this.checked) {
    // Main conference is checked
    if (!mgr.mainConferenceChecked && !mgr.bootcampChecked) {
      mgr.changing = true;
      mgr.mainConferenceChecked = true;
      mgr.mainConference.click();
    }
  }
});
}

var conferenceManager = new ConferenceManager();