A module adding session selection to UC Signup module

pre_conference_sessions.module

<?php

/**
 * Implementation of hook_perm().
 */
function pre_conference_sessions_perm() {
  return array('change pre-conference sessions', 'allow check or money order payment');
}

/**
 * Implements hook_form_alter().
 */
function pre_conference_sessions_form_alter(&$form, &$form_state, $form_id) {

  switch ($form_id) {

    case 'uc_signup_attendees_form':
      // uc_signup_attendees_form_submit was being fired before our function
      // in particular there is a drupal goto function that is preventing our
      // submit function from ever being fired. We array_unshift() to make sure
      // ours is  fired first
      array_unshift($form['#submit'], 'pre_conference_sessions_submit');
      if ($form_state['storage']['step'] == 'profiles') {
        _get_sessions(&$form, &$form_state);
      }
      break;

    case 'uc_cart_checkout_form':

      $form['panes']['payment']['payment_method']['#default_value'] = 'credit';
      if (!user_access('allow check or money order payment')) {
        unset($form['panes']['payment']['payment_method']['#options']['check']);
      }

      break;
  }
}

function _get_sessions($form, &$form_state) {

  $events = $form_state['storage']['uc_signup']['nids'];
  // Build an array keyed on the nids of each event in the cart
  foreach ($events as $nid => $event) {

    foreach ($event as $key => $mail) {

      if (user_is_logged_in() && !user_access('purchase signups for other users')) {
        $mail = $user->mail;
        $_SESSION['uc_signup']['nids'][$nid][0] = $mail;
      }
      // get session nodes for attendees to choose
      $morning_nodes = views_get_view_result(pre_conference_sessions_am, NULL);
      $afternoon_nodes = views_get_view_result(pre_conference_sessions_pm, NULL);

      $morning_options = array();
      foreach ($morning_nodes as $node) {
        $morning_options[$node->nid] = $node->node_title;
      }

      $afternoon_options = array();
      foreach ($afternoon_nodes as $node) {
        $afternoon_options[$node->nid] = $node->node_title;
      }

      // set the pre_conf_nid so we can only show the sessions to those who are registering
      // for the pre-conference.
      // TODO: make a configuration settings page where this can be set in the UI instead of
      // hard coded
      $pre_conf_nid = 2;
      $pre_conf_and_conf_nid = 147;
      // only show preconference sessions to attendees registering for the pre-conference
      if (($nid == $pre_conf_nid) || ($nid == $pre_conf_and_conf_nid)) {
        $count++;

        $morning_default =  $_SESSION['pre_conference'][$mail]['am_session'];
        $afternoon_default = $_SESSION['pre_conference'][$mail]['pm_session'];

        $form[$mail]['pre_conference'] = array(
          '#type' => 'fieldset',
          '#title' => t('Pre Conference Sessions'),
          '#description' => t('Please select your morning sessions.'),
          '#collapsible' => FALSE,
          '#collapsed' => FALSE,
          '#tree' => TRUE,
        );

        $form[$mail]['pre_conference']['morning'.$count] = array(
          '#type' => 'radios',
          '#title' => t('Select A Pre-Conference Morning Session for this attendee'),
          '#default_value' => $morning_default,
          '#options' => $morning_options,
          '#required' => TRUE,
          '#weight' => 20,
        );
        $form[$mail]['pre_conference']['afternoon'.$count] = array(
          '#type' => 'radios',
          '#title' => t('Select Pre-Conference a Afternoon Session for this attendee'),
          '#default_value' => $afternoon_default,
          '#options' => $afternoon_options,
          '#required' => TRUE,
          '#weight' => 22,
        );
        // hidden fields so we can associate the sessions with a user email/account
        $form[$mail]['pre_conference']['morning_attendee'.$count] = array(
          '#type' => 'hidden',
          '#value' => $mail,
        );
        $form[$mail]['pre_conference']['afternoon_attendee'.$count] = array(
          '#type' => 'hidden',
          '#value' => $mail,
        );
      }
    }
  }
}

/**
 * Store attendee Pre-conference sessions keyed on the attendee email
 */
function pre_conference_sessions_submit($form, &$form_state) {

  if ($form_state['storage']['step'] == 'profiles') {
    $count = 1;
    if (!empty($form_state['values']['pre_conference'])) {

      foreach ($form_state['values']['pre_conference'] as $key => $value) {

        if ($key == 'morning_attendee' . $count) {
          $morning_attendee = $form_state['values']['pre_conference']['morning_attendee' . $count];
          $_SESSION['pre_conference'][$morning_attendee]['am_session'] = $form_state['values']['pre_conference']['morning' . $count];
        }
        if ($key == 'afternoon_attendee' . $count) {
          $afternoon_attendee = $form_state['values']['pre_conference']['afternoon_attendee' . $count];
          $_SESSION['pre_conference'][$afternoon_attendee]['pm_session'] = $form_state['values']['pre_conference']['afternoon' . $count];
        $count++;
        }
      }
    }
  }
  // stuff pre_conference Sessions in to $_Session
  $form_state['storage']['pre_conference'] = $_SESSION['pre_conference'];
}


/**
 * Implementation of hook_order().
 */
function pre_conference_sessions_order($op, &$arg1, $arg2) {
  switch ($op) {
    case 'submit':
        // Loop through the attendees
        foreach ($_SESSION['pre_conference'] as $mail => $pre_sessions) {
          $account = user_load(array('mail'=> $mail));

          // save the sessions to the $edit var
          $edit = array();
          $edit['pre_conference_am'] = $pre_sessions['am_session'];
          $edit['pre_conference_pm'] = $pre_sessions['pm_session'];
          // save existing user
          user_save((object) array('uid' => $account->uid), $edit, null);
        }

      // unset attendee in $_SESSION
      unset($_SESSION['pre_conference']);

      break;
  }
}

/**
 * Implementation of hook_user().
 */
function pre_conference_sessions_user($op, &$edit, &$account) {
  switch ($op) {
    case 'form':
      if (user_access('change pre-conference sessions')) {
        $am_nodes = views_get_view_result(pre_conference_sessions_am, NULL);
        $am_options = array();
        foreach ($am_nodes as $am_node) {
          $am_options[$am_node->nid] = $am_node->node_title;
        }
        $pm_nodes = views_get_view_result(pre_conference_sessions_pm, NULL);
        $pm_options = array();
        foreach ($pm_nodes as $pm_node) {
          $pm_options[$pm_node->nid] = $pm_node->node_title;
        }
        $form = array();
        $form['pre_conference'] = array(
          '#type' => 'fieldset',
          '#title' => t('Pre-Conference Sessions'),
          '#description' => t('The description appears at the top of the fieldset.'),
          '#collapsible' => TRUE,
          '#collapsed' => FALSE,
          '#access' => user_access('change pre-conference sessions'),
        );

        $form['pre_conference']['pre_conference_pm'] = array(
          '#type' => 'radios',
          '#title' =>t('Select A Pre-Conference Afternoon Session for this attendee'),
          '#options' => $pm_options,
          '#default_value' => $edit['pre_conference_pm'],
        );
        $form['pre_conference']['pre_conference_am'] = array(
          '#type' => 'radios',
          '#title' => t('Select A Pre-Conference Morning Session for this attendee'),
          '#options' => $am_options,
          '#default_value' => $edit['pre_conference_am'],
        );
      }

      return $form;
    case 'categories':
      return array(array(
        'name' => 'pre-conference-sessions',
        'title' => t('Pre-Conference Sessions'),
        'weight' => 0,
      ));

    case 'view':

      if (user_access('change pre-conference sessions')) {
        $account->content['pre_conference_am'] = array(
          '#type' => 'user_profile_item',
          '#title' => t('AM Session'),
          '#value' => theme('pre_conference_sessions_am', $account),
          '#weight' => 1,
        );
        $account->content['pre_conference_pm'] = array(
          '#type' => 'user_profile_item',
          '#title' => t('PM Session'),
          '#value' => theme('pre_conference_sessions_pm', $account),
          '#weight' => 2,
        );
      }
      break;
  }
}

/**
 * Implements hook_theme().
 */
function pre_conference_sessions_theme($existing, $type, $theme, $path) {
  return array(
    'pre_conference_sessions_am' => array(
      'arguments' => array('account' => NULL)
    ),
    'pre_conference_sessions_pm' => array(
      'arguments' => array('account' => NULL)
    ),
  );
}


/**
* Theme 'pre_conference_sessions_am' to  output Pre-conference Sessions.
*/
function theme_pre_conference_sessions_am($account) {
  $output = node_load($account->pre_conference_am)->title;
  return $output;
}

function theme_pre_conference_sessions_pm($account) {
   $output = node_load($account->pre_conference_pm)->title;
   return $output;
}