<?php

/**
 * @file
 * Opigno messaging app module functions file.
 */

function opigno_messaging_app_permission() {
  return array(
    'message all groups' => array(
      'title' => t("Message to all groups"),
      'description' => t("Allows messaging all the groups"),
    ),
  );
}

function opigno_messaging_app_og_permission() {
  return array(
    'can be messaged' => array(
      'title' => t("Can be messaged"),
      'description' => t("Allows user to be messaged"),
    ),
    'can message anyone' => array(
      'title' => t("Can message anyone"),
      'description' => t("Allows user to message anyone"),
    ),
  );
}

function _opigno_messaging_app_get_groups($user) {
  if (user_access("message all groups", $user)) {
    $allgroups = og_get_all_group('node');
    // Force og_get_all_group() structure to be the same as og_get_groups_by_user()
    foreach ($allgroups as $group_index => $groupid) {
      $groups['node'][$groupid] = $groupid;
    }
    /////////////////////////////////////////////////////
  }
  else {
    $groups = og_get_groups_by_user($user, NULL);
  }
  return $groups;
}


function _opigno_messaging_app_get_users_in_groups($groups, $user) {
  $allusers = entity_load('user');
  foreach ($allusers as $account) {
    foreach ($groups['node'] as $groupsid => $group_id) {
      if (($account->uid != 0) && ($account->uid != $user->uid)) {
        if ((og_is_member('node', $group_id, 'user', $account)) && ((og_user_access('node', $group_id, "can be messaged", $account)) || (og_user_access('node', $group_id, "can message anyone", $user)))) {
          $users[$account->uid] = $account->name;
        }
      }
    }
  }
  return $users;
}

function opigno_messaging_app_form_alter(&$form, &$form_state, $form_id) {
  if (($form['form_id']['#value'] == 'privatemsg_new') && (strpos($form['#action'], '/messages/new') !== FALSE)) {
    $form['#attached']['js'][] = drupal_add_js(drupal_get_path('module', 'opigno_messaging_app') . '/js/multiselect_messaging.js');
    global $user;
    $groups = _opigno_messaging_app_get_groups($user);
    $form['groups'] = array(
      '#type' => 'select',
      '#title' => t('Courses and Classes'),
      '#options' => array(
        'All' => t('All'),
      ),
      '#default_value' => t('All'),
      '#description' => t('Choose class or course to filter'),
      '#weight' => -7,
      '#ajax' => array(
        'callback' => 'messaging_user_update_callback',
        'wrapper' => 'recipient1-div',
        'method' => 'replace',
        'effect' => 'fade',
      ),
    );

    $cache = array();
    foreach ($groups['node'] as $groupid => $group_id) {
      $node = node_load($group_id);
      if (!isset($cache[$node->type])) {
        $typeinfo = node_type_load($node->type);
        $cache[$node->type] = $typeinfo->name; //check if object
      }
      $form['groups']['#options'][$cache[$node->type]][$groupid] = $node->title;
    }

    unset($form['recipient']['#required']);
    if (!isset($form['recipient1'])) {
      $form['recipient1'] = array(
        '#type' => 'multiselect',
        '#title' => t('Select recipients'),
        '#default_value' => NULL,
        '#size' => 10,
        '#required' => TRUE,
        '#weight' => -6,
        '#prefix' => '<div id="recipient1-div">',
        '#suffix' => '</div>',
        '#validated' => TRUE,
      );
    }

    $users = _opigno_messaging_app_get_users_in_groups($groups, $user);
    foreach ($users as $account) {
      $form['recipient1']['#options'][$account] = $account;
    }

    $form['body']['#required'] = TRUE;
    $form['subject']['#required'] = TRUE;
  }
}

function messaging_user_update_callback($form, &$form_state) {
  $form['recipient1']['#options'] = NULL;
  $group = $form_state['input']['groups'];
  global $user;
  if ($group === t('All')) {
    $groups = _opigno_messaging_app_get_groups($user);
    $users = _opigno_messaging_app_get_users_in_groups($groups, $user);
  }
  else {
    $groups['node'][$group] = $group;
    $users = _opigno_messaging_app_get_users_in_groups($groups, $user);
  }
  foreach ($users as $userid => $username) {
    $form['recipient1']['#options'][$username] = $username;
  }
  return $form['recipient1'];
}