<?php
// $Id: og_language.module,v 1.1.2.7 2010-12-22 07:54:49 amitaibu Exp $

/**
 * @file
 * Associate language interface to a group.
 */

/**
 * Group language field.
 */
define('OG_LANGUAGE_FIELD', 'group_language');

/**
 * Implement og_fields_info().
 */
function og_language_group_fields_info() {
  $items[OG_LANGUAGE_FIELD] = array(
    'type' => array('group'),
    'description' => t('Associate language interface to a group.'),
    'field' => array(
      'field_name' => OG_LANGUAGE_FIELD,
      'no_ui' => TRUE,
      'type' => 'list_text',
      'cardinality' => 1,
      'settings' => array('allowed_values' => array(), 'allowed_values_function' => 'og_language_field_allowed_values'),
    ),
    'instance' => array(
      'label' => t('Groups language interface'),
      'widget_type' => 'options_select',
      'required' => TRUE,
      // Use default language as default value.
      'default_value' => array(0 => array('value' => '__default')),
      'view modes' => array(
        'full' => array(
          'label' => 'above',
          'type' => 'list_default',
        ),
        'teaser' => array(
          'label' => 'above',
          'type' => 'list_default',
        ),
      ),
    ),
  );

  return $items;
}

/**
 * Implements hook_language_negotiation_info().
 */
function og_language_language_negotiation_info() {
  $providers = array();

  $providers['group-language'] = array(
    'callbacks' => array('language' => 'og_language_from_group_context'),
    'weight' => -5,
    'name' => t('Group'),
    'description' => t("Follow the Group context's language preference."),
    'file' => drupal_get_path('module', 'og_language') .'/group_language.module',
  );

  return $providers;
}

/**
 * Identify language from a request/session parameter.
 *
 * @param $languages
 *   An array of valid language objects.
 *
 * @return
 *   A valid language code on success, FALSE otherwise.
 */
function og_language_from_group_context($languages) {
  // We need a full bootstrap in order to get the group context.
  drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);

  if ($group = og_context()) {
    // Load the entity.
    $entity = og_load_entity_from_group($group->gid);

    // Check if a theme field exists, and it isn't defined as "default"
    // (i.e. use the default site language).
    if (!empty($entity->{OG_LANGUAGE_FIELD}[LANGUAGE_NONE][0]['value']) && $entity->{OG_LANGUAGE_FIELD}[LANGUAGE_NONE][0]['value'] != '__default') {
      // TODO: Check language is valid.
      return $entity->{OG_LANGUAGE_FIELD}[LANGUAGE_NONE][0]['value'];
    }
  }
  return FALSE;
}


/**
 * Return all enabled languages.
 */
function og_language_field_allowed_values() {
  $return = array('__default' => t('Use site-wide language interface definition'));

  foreach (locale_language_list() as $key => $value) {
    $return[$key] = check_plain($value);
  }

  return $return;
}