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<?php

/**

 * @file

 * i18n taxonomy module

 *

 * Internationalization (i18n) package.

 *

 * This module groups together all existing i18n taxonomy functionality

 * providing several options for taxonomy translation.

 *

 * Translates taxonomy term for selected vocabularies running them through the localization system.

 * It also translates terms for views filters and views results.

 *

 * @author Jose A. Reyero, 2004

 */

/**

 * Implements hook_help().

 */

function i18n_taxonomy_help($path, $arg) {

  switch ($path) {

    case 'admin/help#i18n_taxonomy' :

      $output = '<p>' . t('This module adds support for multilingual taxonomy. You can set up multilingual options for each vocabulary:') . '</p>';

      $output .= '<ul>';

      $output .= '<li>' . t('A language can be assigned globaly for a vocabulary.') . '</li>';

      $output .= '<li>' . t('Different terms for each language with translation relationships.') . '</li>';

      $output .= '<li>' . t('Terms can be common to all languages, but may be localized.') . '</li>';

      $output .= '</ul>';

      $output .= '<p>' . t('To search and translate strings, use the <a href="@translate-interface">translation interface</a> pages.', array('@translate-interface' => url('admin/config/regional/translate'))) . '</p>';

      $output .= '<p>' . t('For more information, see the online handbook entry for <a href="@i18n">Internationalization module</a>.', array('@i18n' => 'http://drupal.org/node/133977')) . '</p>';

      return $output;

    case 'admin/config/regional/i18n':

      $output = '<p>' . t('To set up multilingual options for vocabularies go to <a href="@configure_taxonomy">Taxonomy configuration page</a>.', array('@configure_taxonomy' => url('admin/structure/taxonomy'))) . '</p>';

      return $output;

    case 'admin/structure/taxonomy/%':

      $vocabulary = taxonomy_vocabulary_machine_name_load($arg[3]);

      switch (i18n_taxonomy_vocabulary_mode($vocabulary)) {

        case I18N_MODE_LOCALIZE:

          return '<p>' . t('%capital_name is a localizable vocabulary. You will be able to translate term names and descriptions using the <a href="@translate-interface">translate interface</a> pages.', array('%capital_name' => drupal_ucfirst($vocabulary->name), '%name' => $vocabulary->name, '@translate-interface' => url('admin/config/regional/translate'))) . '</p>';

        case I18N_MODE_LANGUAGE:

          return '<p>' . t('%capital_name is a vocabulary with a fixed language. All the terms in this vocabulary will have %language language.', array('%capital_name' => drupal_ucfirst($vocabulary->name), '%name' => $vocabulary->name, '%language' => i18n_language_property($vocabulary->language, 'name'))) . '</p>';

        case I18N_MODE_TRANSLATE:

          return '<p>' . t('%capital_name is a full multilingual vocabulary. You will be able to set a language for each term and create translation relationships.', array('%capital_name' => drupal_ucfirst($vocabulary->name))) . '</p>';

      }

      break;

  }

}

/**

 * Implements hook_menu().

 */

function i18n_taxonomy_menu() {

  $items['admin/structure/taxonomy/%taxonomy_vocabulary_machine_name/list/list'] = array(

    'title' => 'Terms',

    'type' => MENU_DEFAULT_LOCAL_TASK,

    'weight' => -20,

  );

  $items['admin/structure/taxonomy/%taxonomy_vocabulary_machine_name/list/sets'] = array(

    'title' => 'Translation sets',

    'page callback' => 'i18n_taxonomy_translation_sets_overview',

    'page arguments' => array(3),

    'access callback' => 'i18n_taxonomy_vocabulary_translation_tab_sets_access',

    'access arguments' => array(3),

    'type' => MENU_LOCAL_TASK,

    'file' => 'i18n_taxonomy.admin.inc',

  );

  $items['admin/structure/taxonomy/%taxonomy_vocabulary_machine_name/list/sets/add'] = array(

    'title' => 'Create new translation',

    'page callback' => 'drupal_get_form',

    'page arguments' => array('i18n_taxonomy_translation_term_form', 3),

    'access callback' => 'i18n_taxonomy_vocabulary_translation_tab_sets_access',

    'access arguments' => array(3),

    'type' => MENU_LOCAL_ACTION,

    //'parent' => 'admin/content/taxonomy/%taxonomy_vocabulary',

    'file' => 'i18n_taxonomy.admin.inc',

  );

  $items['admin/structure/taxonomy/%taxonomy_vocabulary_machine_name/list/sets/edit/%i18n_taxonomy_translation_set'] = array(

    'title' => 'Edit translation',

    'page callback' => 'drupal_get_form',

    'page arguments' => array('i18n_taxonomy_translation_term_form', 3, 7),

    'access callback' => 'i18n_taxonomy_vocabulary_translation_tab_sets_access',

    'access arguments' => array(3),

    'type' => MENU_CALLBACK,

    //'parent' => 'admin/content/taxonomy/%taxonomy_vocabulary',

    'file' => 'i18n_taxonomy.admin.inc',

  );

  $items['admin/structure/taxonomy/%taxonomy_vocabulary_machine_name/list/sets/delete/%i18n_taxonomy_translation_set'] = array(

    'title' => 'Delete translation',

    'page callback' => 'drupal_get_form',

    'page arguments' => array('i18n_translation_set_delete_confirm', 7),

    'access callback' => 'i18n_taxonomy_vocabulary_translation_tab_sets_access',

    'access arguments' => array(3),

    'type' => MENU_CALLBACK,

  );

  $items['i18n/taxonomy/autocomplete/vocabulary/%taxonomy_vocabulary_machine_name/%'] = array(

    'title' => 'Autocomplete taxonomy',

    'page callback' => 'i18n_taxonomy_autocomplete_language',

    'page arguments' => array(5, 4),

    'access arguments' => array('access content'),

    'type' => MENU_CALLBACK,

    'file' => 'i18n_taxonomy.pages.inc',

  );

  $items['i18n/taxonomy/autocomplete/language/%'] = array(

    'title' => 'Autocomplete taxonomy',

    'page callback' => 'i18n_taxonomy_autocomplete_language',

    'page arguments' => array(4, NULL),

    'access arguments' => array('access content'),

    'type' => MENU_CALLBACK,

    'file' => 'i18n_taxonomy.pages.inc',

  );

  return $items;

}

/**

 * Implements hook_admin_paths().

 */

function i18n_taxonomy_admin_paths() {

  $paths = array(

    'taxonomy/*/translate' => TRUE,

    'taxonomy/*/translate/*' => TRUE,

  );

  return $paths;

}

/**

 * Implements hook_menu_alter().

 *

 * Take over the taxonomy pages

 */

function i18n_taxonomy_menu_alter(&$items) {

  // If ctool's page manager is active for the path skip this modules override.

  // Also views module takes over this page so this won't work if views enabled.

  // Skip when taxonomy_display enabled, see http://drupal.org/node/1280194

  if (variable_get('page_manager_term_view_disabled', TRUE) && !module_exists('taxonomy_display')) {

    // Taxonomy term page. Localize terms.

    $items['taxonomy/term/%taxonomy_term']['page callback'] = 'i18n_taxonomy_term_page';

    $items['taxonomy/term/%taxonomy_term']['title callback'] = 'i18n_taxonomy_term_name';

    $items['taxonomy/term/%taxonomy_term']['file'] = 'i18n_taxonomy.pages.inc';

    $items['taxonomy/term/%taxonomy_term']['file path'] = drupal_get_path('module', 'i18n_taxonomy');

  }

  // Localize autocomplete

  $items['taxonomy/autocomplete']['page callback'] = 'i18n_taxonomy_autocomplete_field';

  $items['taxonomy/autocomplete']['file'] = 'i18n_taxonomy.pages.inc';

  $items['taxonomy/autocomplete']['file path'] = drupal_get_path('module', 'i18n_taxonomy');

}

/**

 * Menu access callback for vocabulary translation tab. Show tab only for full multilingual vocabularies.

 */

function i18n_taxonomy_vocabulary_translation_tab_sets_access($vocabulary) {

  return user_access('administer taxonomy') && i18n_taxonomy_vocabulary_mode($vocabulary->vid, I18N_MODE_TRANSLATE);

}

/**

 * Menu access callback for term translation tab. Show tab only for translatable terms

 *

 * @todo This should work also for localizable terms when we've got that part implemented

 */

function i18n_taxonomy_term_translation_tab_access($term) {

  return taxonomy_term_edit_access($term) && i18n_taxonomy_vocabulary_mode($term->vid) & I18N_MODE_MULTIPLE && user_access('translate interface');

}

/**

 * Implements hook_field_formatter_info().

 */

function i18n_taxonomy_field_formatter_info() {

  return array(

    'i18n_taxonomy_term_reference_link' => array(

      'label' => t('Link (localized)'),

      'field types' => array('taxonomy_term_reference'),

    ),

    'i18n_taxonomy_term_reference_plain' => array(

      'label' => t('Plain text (localized)'),

      'field types' => array('taxonomy_term_reference'),

    ),

  );

}

 /**

 * Implements hook_field_formatter_prepare_view().

 *

 * This preloads all taxonomy terms for multiple loaded objects at once and

 * unsets values for invalid terms that do not exist.

 */

function i18n_taxonomy_field_formatter_prepare_view($entity_type, $entities, $field, $instances, $langcode, &$items, $displays) {

  return taxonomy_field_formatter_prepare_view($entity_type, $entities, $field, $instances, $langcode, $items, $displays);

}

/**

 * Implements hook_field_formatter_view().

 */

function i18n_taxonomy_field_formatter_view($entity_type, $entity, $field, $instance, $langcode, $items, $display) {

  $element = array();

  $language = i18n_language_interface();

  // Terms whose tid is 'autocreate' do not exist

  // yet and $item['taxonomy_term'] is not set. Theme such terms as

  // just their name.

  switch ($display['type']) {

    case 'i18n_taxonomy_term_reference_link':

      foreach ($items as $delta => $item) {

        if ($item['tid'] == 'autocreate') {

          $element[$delta] = array(

            '#markup' => check_plain($item['name']),

          );

        }

        else {

          $term = $item['taxonomy_term'];

          $uri = entity_uri('taxonomy_term', $term);

          $element[$delta] = array(

            '#type' => 'link',

            '#title' => i18n_taxonomy_term_name($term, $language->language),

            '#href' => $uri['path'],

            '#options' => $uri['options'],

          );

        }

      }

      break;

    case 'i18n_taxonomy_term_reference_plain':

      foreach ($items as $delta => $item) {

        $name = ($item['tid'] != 'autocreate' ? i18n_taxonomy_term_name($item['taxonomy_term'], $language->language): $item['name']);

        $element[$delta] = array(

          '#markup' => check_plain($name),

        );

      }

      break;

  }

  return $element;

}

/**

 * Implements hook_field_extra_fields().

 */

function i18n_taxonomy_field_extra_fields() {

  $return = array();

  $info = entity_get_info('taxonomy_term');

  foreach (array_keys($info['bundles']) as $bundle) {

    $vocabulary = taxonomy_vocabulary_machine_name_load($bundle);

    if ($vocabulary && i18n_taxonomy_vocabulary_mode($vocabulary, I18N_MODE_TRANSLATE)) {

      $return['taxonomy_term'][$bundle] = i18n_language_field_extra();

    }

  }

  return $return;

}

/**

 * Implements hook_field_attach_view_alter().

 */

function i18n_taxonomy_field_attach_view_alter(&$output, $context) {

  // Copied from rdf_field_attach_view_alter of modules/rdf/rdf.module since we have another #formatter

  // Append term mappings on displayed taxonomy links.

  foreach (element_children($output) as $field_name) {

    $element = &$output[$field_name];

    if (isset($element['#field_type']) && $element['#field_type'] == 'taxonomy_term_reference' && $element['#formatter'] == 'i18n_taxonomy_term_reference_link') {

      foreach ($element['#items'] as $delta => $item) {

        // This function is invoked during entity preview when taxonomy term

        // reference items might contain free-tagging terms that do not exist

        // yet and thus have no $item['taxonomy_term'].

        if (isset($item['taxonomy_term'])) {

          $term = $item['taxonomy_term'];

          if (!empty($term->rdf_mapping['rdftype'])) {

            $element[$delta]['#options']['attributes']['typeof'] = $term->rdf_mapping['rdftype'];

          }

          if (!empty($term->rdf_mapping['name']['predicates'])) {

            $element[$delta]['#options']['attributes']['property'] = $term->rdf_mapping['name']['predicates'];

          }

        }

      }

    }

  }

  // Add language field for display

  if ($context['entity_type'] == 'taxonomy_term' && i18n_taxonomy_vocabulary_mode($context['entity']->vid, I18N_MODE_TRANSLATE)) {

    $output['language'] = array(

      '#type' => 'item',

      '#title' => t('Language'),

      '#markup' => i18n_language_name($context['entity']->language),

    );

  }

}

/**

 * Implements hook_field_info_alter()

 */

function i18n_taxonomy_field_info_alter(&$info) {

  // Change default formatter for term reference fields

  $info['taxonomy_term_reference']['default_formatter'] = 'i18n_taxonomy_term_reference_link';

  // Translate field values.

  $info['taxonomy_term_reference']['options_list_callback'] = 'i18n_taxonomy_allowed_values';

  // Sync callback for field translations

  $info['taxonomy_term_reference']['i18n_sync_callback'] = 'i18n_taxonomy_field_prepare_translation';

}

/**

 * Implements hook_field_storage_details_alter().

 *

 * We don't alter the storage details but the stored details of the field itself...

 *

 * @param array $field

 *   The field record just read from the database.

 */

function i18n_taxonomy_field_storage_details_alter(&$details, &$field) {

  if ($field['type'] === 'taxonomy_term_reference') {

    $field['settings']['options_list_callback'] = 'i18n_taxonomy_allowed_values';

  }

}

/**

 * Implements hook_field_attach_prepare_translation_alter().

 *

 * Prepare and synchronize translation for term reference fields.

 */

function i18n_taxonomy_field_attach_prepare_translation_alter(&$entity, $context) {

  $entity_type = $context['entity_type'];

  $source_entity = $context['source_entity'];

  $options = array(

    'default' => FALSE,

    'deleted' => FALSE,

    'language' => NULL,

  );

  // Determine the list of instances to iterate on.

  list(, , $bundle) = entity_extract_ids($entity_type, $source_entity);

  $instances = _field_invoke_get_instances($entity_type, $bundle, $options);

  if (!empty($instances)) {

    foreach ($instances as $field_info) {

      $field = field_info_field($field_info['field_name']);

      if ($field['type'] == 'taxonomy_term_reference' && isset($entity->{$field_info['field_name']})) {

        // iterate over languages.

        foreach ($entity->{$field_info['field_name']} as $language => &$items) {

          i18n_taxonomy_field_prepare_translation($entity_type, $entity, $field, $field_info, $entity->language, $items, $source_entity, $source_entity->language);

        }

      }

    }

  }

}

/**

 * Prepare and synchronize translation for term reference fields

 */

function i18n_taxonomy_field_prepare_translation($entity_type, $entity, $field, $instance, $langcode, &$items, $source_entity, $source_langcode) {

  foreach ($items as $index => $item) {

    $term = isset($item['taxonomy_term']) ? $item['taxonomy_term'] : taxonomy_term_load($item['tid']);

    if ($translation = i18n_taxonomy_term_get_translation($term, $langcode)) {

      $items[$index] = array(

        'taxonomy_term' => $translation,

        'tid' => $translation->tid

      );

    }

    $field['settings']['options_list_callback'] = 'i18n_taxonomy_allowed_values';

  }

}

/**

 * Returns the set of valid terms for a taxonomy field.

 *

 * @param $field

 *   The field definition.

 * @return

 *   The array of valid terms for this field, keyed by term id.

 */

function i18n_taxonomy_allowed_values($field) {

  $options = array();

  foreach ($field['settings']['allowed_values'] as $tree) {

    if ($vocabulary = taxonomy_vocabulary_machine_name_load($tree['vocabulary'])) {

      if ($terms = taxonomy_get_tree($vocabulary->vid, $tree['parent'])) {

        foreach ($terms as $term) {

          $options[$term->tid] = str_repeat('-', $term->depth) . i18n_taxonomy_term_name($term);

        }

      }

    }

  }

  return $options;

}

/**

 * Implements hook_i18n_translate_path()

 */

function i18n_taxonomy_i18n_translate_path($path) {

  if (strpos($path, 'taxonomy/term/') === 0) {

    return i18n_taxonomy_translate_path($path);

  }

}

/**

 * Implements hook_i18n_context_language().

 */

function i18n_taxonomy_i18n_context_language() {

  if (arg(0) == 'taxonomy') {

    // Taxonomy term pages

    if (arg(1) == 'term' && is_numeric(arg(2)) && ($term = menu_get_object('taxonomy_term', 2)) && ($langcode = i18n_object_langcode($term))) {

      return i18n_language_object($langcode);

    }

  }

}

/**

 * Find translations for taxonomy paths.

 *

 * @param $path

 *   Path to translate.

 * @param $path_prefix

 *   Path prefix, including trailing slash, defaults to 'taxonomy/term/'.

 *   It will be different for taxonomy term pages and for forum pages.

 *

 * @return

 *   Array of links (each an array with href, title), indexed by language code.

 */

function i18n_taxonomy_translate_path($path, $path_prefix = 'taxonomy/term/') {

  $prefix_match = strtr($path_prefix, array('/' => '\/'));

  if (preg_match("/^($prefix_match)([^\/]*)(.*)$/", $path, $matches)) {

    $links = array();

    $term = FALSE;

    // If single term, treat it differently

    if (is_numeric($matches[2]) && !$matches[3]) {

      $term = taxonomy_term_load($matches[2]);

      if (!empty($term->i18n_tsid)) {

        $set = i18n_translation_set_load($term->i18n_tsid);

      }

    }

    foreach (language_list() as $langcode => $language) {

      if ($term) {

        if (!empty($set) && ($translation = $set->get_item($langcode))) {

          $links[$langcode] = array(

            'href' => $path_prefix . $translation->tid,

            'title' => $translation->name,

          );

        }

        else {

          $links[$langcode] = array(

            'href' => $path,

            'title' => i18n_taxonomy_term_name($term, $langcode),

          );

        }

      }

      elseif ($str_tids = i18n_taxonomy_translation_tids($matches[2], $langcode)) {

        $links[$langcode]['href'] = $path_prefix . $str_tids . $matches[3];

      }

    }

    return $links;

  }

}

/**

 * Get localized term name unfiltered.

 */

function i18n_taxonomy_term_name($term, $langcode = NULL) {

  $key = i18n_object_info('taxonomy_term', 'key');

  return i18n_taxonomy_vocabulary_mode($term->vid, I18N_MODE_LOCALIZE) ? i18n_string(array('taxonomy', 'term', $term->{$key}, 'name'), $term->name, array('langcode' => $langcode, 'sanitize' => FALSE)) : $term->name;

}

/**

 * Get localized term description unfiltered.

 */

function i18n_taxonomy_term_description($term, $langcode = NULL) {

  $key = i18n_object_info('taxonomy_term', 'key');

  return i18n_taxonomy_vocabulary_mode($term->vid, I18N_MODE_LOCALIZE) ? i18n_string(array('taxonomy', 'term', $term->{$key}, 'description'), $term->description, array('langcode' => $langcode, 'sanitize' => FALSE)) : $term->description;

}

/**

 * Find term translation from translation set.

 *

 * @param $term

 *   Term object to find translation.

 * @param $langcode

 *   Language code to find translation for.

 * @result object Taxonomy Term

 *   Translation if exists.

 */

function i18n_taxonomy_term_get_translation($term, $langcode) {

  if (i18n_object_langcode($term)) {

    if ($term->language == $langcode) {

      // Translation is the term itself.

      return $term;

    }

    elseif (!empty($term->i18n_tsid)) {

      return i18n_translation_set_load($term->i18n_tsid)->get_item($langcode);

    }

    else {

      return NULL;

    }

  }

  else {

    // Term has no language, translation should be the same

    return $term;

  }

}

/**

 * Get localized vocabulary name, unfiltered.

 */

function i18n_taxonomy_vocabulary_name($vocabulary, $langcode = NULL) {

  return i18n_object_langcode($vocabulary) ? $vocabulary->name : i18n_string(array('taxonomy', 'vocabulary', $vocabulary->vid, 'name'), $vocabulary->name, array('langcode' => $langcode, 'sanitize' => FALSE));

}

/**

 * Get localized vocabulary description, unfiltered.

 */

function i18n_taxonomy_vocabulary_description($vocabulary, $langcode = NULL) {

  return i18n_object_langcode($vocabulary) ? $vocabulary->description : i18n_string(array('taxonomy', 'vocabulary', $vocabulary->vid, 'description'), $vocabulary->description, array('langcode' => $langcode, 'sanitize' => FALSE));

}

/**

 * Get translated term's tid.

 *

 * @param $tid

 *   Node nid to search for translation.

 * @param $language

 *   Language to search for the translation, defaults to current language.

 * @param $default

 *   Value that will be returned if no translation is found.

 * @return

 *   Translated term tid if exists, or $default.

 */

function i18n_taxonomy_translation_term_tid($tid, $language = NULL, $default = NULL) {

  $translation = db_query('SELECT t.tid FROM {taxonomy_term_data} t INNER JOIN {taxonomy_term_data} a ON t.i18n_tsid = a.i18n_tsid AND t.tid <> a.tid WHERE a.tid = :tid AND t.language = :language AND t.i18n_tsid > 0', array(

    ':tid' => $tid,

    ':language' => $language ? $language : i18n_language_content()->language

  ))->fetchField();

  return $translation ? $translation : $default;

}

/**

 *  Returns an url for the translated taxonomy-page, if exists.

 */

function i18n_taxonomy_translation_tids($str_tids, $lang) {

  if (preg_match('/^([0-9]+[+ ])+[0-9]+$/', $str_tids)) {

    $separator = '+';

    // The '+' character in a query string may be parsed as ' '.

    $tids = preg_split('/[+ ]/', $str_tids);

  }

  elseif (preg_match('/^([0-9]+,)*[0-9]+$/', $str_tids)) {

    $separator = ',';

    $tids = explode(',', $str_tids);

  }

  else {

    return;

  }

  $translated_tids = array();

  foreach ($tids as $tid) {

    if ($translated_tid = i18n_taxonomy_translation_term_tid($tid, $lang)) {

      $translated_tids[] = $translated_tid;

    }

  }

  return implode($separator, $translated_tids);

}

/**

 * Implements hook_taxonomy_display_breadcrumb_parents_alter().

 */

function i18n_taxonomy_taxonomy_display_breadcrumb_parents_alter(&$parents) {

  $parents = i18n_taxonomy_localize_terms($parents);

}

/**

 * Implements hook_taxonomy_display_term_page_term_object_alter().

 */

function i18n_taxonomy_taxonomy_display_term_page_term_object_alter(&$term) {

  $term = i18n_taxonomy_localize_terms($term);

}

/**

 * Implements hook_taxonomy_term_insert()

 */

function i18n_taxonomy_taxonomy_term_insert($term) {

  i18n_taxonomy_taxonomy_term_update($term);

}

/**

 * Implements hook_taxonomy_term_update()

 */

function i18n_taxonomy_taxonomy_term_update($term) {

  if (i18n_taxonomy_vocabulary_mode($term->vid, I18N_MODE_LOCALIZE)) {

    i18n_string_object_update('taxonomy_term', $term);

  }

  // Multilingual terms, translatable. Link / unlink from translation set.

  if (i18n_taxonomy_vocabulary_mode($term->vid, I18N_MODE_TRANSLATE) && !empty($term->translation_set)) {

    if (i18n_object_langcode($term)) {

      $term->translation_set

        ->add_item($term)

        ->save();

    }

    elseif (!empty($term->original)) {

      // Term set to language neutral, remove it from translation set and update set (delete if empty)

      $term->translation_set

        ->remove_item($term->original)

        ->update_delete();

    }

  }

}

/**

 * Implements hook_taxonomy_term_delete()

 */

function i18n_taxonomy_taxonomy_term_delete($term) {

  // If a translation set exists for this term, remove this term from the set.

  if (isset($term->i18n_tsid) && $term->i18n_tsid) {

    $translation_set = i18n_translation_set_load($term->i18n_tsid);

    $translation_set->get_translations();

    $translation_set->remove_language($term->language);

    // If there are no terms left in this translation set, delete the set.

    // Otherwise update the set.

    $translation_set->update_delete();

  }

  // Just in case there's any left over string we run it for all terms.

  i18n_string_object_remove('taxonomy_term', $term);

}

/**

 * Implements hook_taxonomy_vocabulary_insert()

 */

function i18n_taxonomy_taxonomy_vocabulary_insert($vocabulary) {

  i18n_taxonomy_taxonomy_vocabulary_update($vocabulary);

}

/**

 * Implements hook_taxonomy_vocabulary_update()

 */

function i18n_taxonomy_taxonomy_vocabulary_update($vocabulary) {

  // Update language for related terms

  switch (i18n_taxonomy_vocabulary_mode($vocabulary)) {

    case I18N_MODE_LANGUAGE:

      $update['language'] = $vocabulary->language;

      break;

    case I18N_MODE_NONE:

      $update['language'] = LANGUAGE_NONE;

      break;

  }

  if (isset($update)) {

    db_update('taxonomy_term_data')

      ->fields($update)

      ->condition('vid', $vocabulary->vid)

      ->execute();

    drupal_set_message(t('Reset language for all terms.'));

  }

  // Update strings, always add translation if no language

  if (!i18n_object_langcode($vocabulary)) {

    i18n_string_object_update('taxonomy_vocabulary', $vocabulary);

  }

}

/**

 * Implements hook_taxonomy_vocabulary_delete()

 */

function i18n_taxonomy_taxonomy_vocabulary_delete($vocabulary) {

  i18n_string_object_remove('taxonomy_vocabulary', $vocabulary);

}

/**

 * Implements hook_taxonomy_term_presave()

 */

function i18n_taxonomy_taxonomy_term_presave($term) {

  switch (i18n_taxonomy_vocabulary_mode($term->vid)) {

    case I18N_MODE_LANGUAGE: // Predefined language for all terms

      $term->language = taxonomy_vocabulary_load($term->vid)->language;

      break;

    case I18N_MODE_TRANSLATE: // Multilingual terms, translatable

      if (!isset($term->language)) {

         // The term may come from a node tags field, just if this is not a taxonomy form.

         // Or from any other object we are editing. So we use 'context' language here.

        $term->language = i18n_language_context()->language;

      }

      // Only for the case the term has no language, it may need to be removed from translation set

      if (empty($term->language)) {

        $term->i18n_tsid = 0;

      }

      break;

  }

}

/**

 * Implements hook_form_FORM_ID_alter()

 */

function i18n_taxonomy_form_taxonomy_form_vocabulary_alter(&$form, &$form_state) {

  if (!isset($form_state['confirm_delete'])) {

    $vocabulary = $form_state['vocabulary'];

    $i18n_mode = i18n_taxonomy_vocabulary_mode($vocabulary);

    $langcode = i18n_object_langcode($vocabulary, LANGUAGE_NONE);

    // Define the replacement names to add some logic to the translation mode options.

    $form += i18n_translation_mode_element('taxonomy_vocabulary', $i18n_mode, $langcode);

    if (user_access('translate interface')) {

      $form['actions']['translate'] = array(

        '#type' => 'submit',

        '#name'   => 'save_translate',

        '#value' => t('Save and translate'),

        '#weight' => 5,

        '#states' => array(

          'invisible' => array(

            // Hide the button if language mode is selected value needs to be a

            // string so that the javascript-side matching works.

            'input[name=i18n_mode]' => array('value' => (string)I18N_MODE_LANGUAGE),

          )

        )

      );

      // Make sure the delete buttons shows up last.

      if (isset($form['actions']['delete'])) {

        $form['actions']['delete']['#weight'] = 10;

      }

    }

    $form['#validate'][] = 'i18n_taxonomy_form_vocabulary_validate';

    $form['#submit'][] = 'i18n_taxonomy_form_vocabulary_submit';

  }

}

/**

 * Form submit callback to redirect when using the save and translate button.

 */

function i18n_taxonomy_form_vocabulary_submit($form, &$form_state) {

  if ($form_state['triggering_element']['#name'] == 'save_translate') {

    $form_state['redirect'] = 'admin/structure/taxonomy/' . $form_state['values']['machine_name'] . '/translate';

  }

}

/**

 * Implements hook_form_FORM_ID_alter()

 */

function i18n_taxonomy_form_taxonomy_form_term_alter(&$form, &$form_state) {

  // Check for confirmation forms

  if (isset($form_state['confirm_delete']) || isset($form_state['confirm_parents'])) return;

  $term = $form_state['term'];

  $vocabulary = $form['#vocabulary'];

  // Mark form so we can know later when saving the term it came from a taxonomy form

  $form['i18n_taxonomy_form'] = array('#type' => 'value', '#value' => 1);

  // Add language field or not depending on taxonomy mode.

  switch (i18n_taxonomy_vocabulary_mode($vocabulary->vid)) {

    case I18N_MODE_TRANSLATE:

      $form['language'] = array(

        '#description' => t('This term belongs to a multilingual vocabulary. You can set a language for it.'),

      ) + i18n_element_language_select($term);

      // If the term to be added will be a translation of a source term,

      // set the default value of the option list to the target language and

      // create a form element for storing the translation set of the source term.

      if (empty($term->tid) && isset($_GET['translation']) && isset($_GET['target']) && ($source_term = taxonomy_term_load($_GET['translation'])) && ($target_language = i18n_language_object($_GET['target']))) {

        // Set context language to target language.

        i18n_language_context($target_language);

        // Add the translation set to the form so we know the new term

        // needs to be added to that set.

        if (!empty($source_term->i18n_tsid)) {

          $translation_set = i18n_taxonomy_translation_set_load($source_term->i18n_tsid);

        }

        else {

          // No translation set yet, build a new one with the source term.

          $translation_set = i18n_translation_set_create('taxonomy_term', $vocabulary->machine_name)

          ->add_item($source_term);

        }

        $form['language']['#default_value'] = $target_language->language;

        $form['language']['#disabled'] = TRUE;

        drupal_set_title(t('%language translation of term %title', array('%language' => locale_language_name($_GET['target']), '%title' => $source_term->name)), PASS_THROUGH);

      }

      elseif (!empty($term->tid) && i18n_object_langcode($term)) {

        // Set context language to term language.

        i18n_language_context(i18n_language_object($term->language));

        // If the current term is part of a translation set,

        // remove all other languages of the option list.

        if (!empty($term->i18n_tsid)) {

          $translation_set = i18n_taxonomy_translation_set_load($term->i18n_tsid);

          $translations = $translation_set->get_translations();

          // If the number of translations equals 1, there's only a source translation.

          if (count($translations) > 1) {

            //unset($form['language']['#options'][LANGUAGE_NONE]);

            foreach ($translations as $langcode => $translation) {

              if ($translation->tid !== $term->tid) {

                unset($form['language']['#options'][$langcode]);

              }

            }

            $form['language']['#description'] = t('This term already belongs to a <a href="@term-translation">translation set</a>. Changing language to <i>Language neutral</i> will remove it from the set.', array('@term-translation' => url('taxonomy/term/' . $term->tid . '/translate')));

          }

        }

      }

      // If we've got a translation set, add it to the form.

      if (!empty($translation_set)) {

        $form['translation_set'] = array(

          '#type' => 'value',

          '#value' => $translation_set,

        );

      }

      break;

    case I18N_MODE_LANGUAGE:

      // Set context language to vocabulary language and add value to the form.

      i18n_language_context(i18n_language_object($vocabulary->language));

      $form['language'] = array(

        '#type' => 'value',

        '#value' => $vocabulary->language

      );

      $form['identification']['language_info'] = array('#value' => t('All terms in this vocabulary have a fixed language: %language', array('%language' => i18n_language_name($vocabulary->language))));

      break;

    case I18N_MODE_LOCALIZE:

      $form['language'] = array(

        '#type' => 'value',

        '#value' => LANGUAGE_NONE,

      );

      break;

    case I18N_MODE_NONE:

    default:

      $form['language'] = array(

        '#type' => 'value',

        '#value' => LANGUAGE_NONE,

      );

      break;

  }

  if (user_access('translate interface') && i18n_taxonomy_vocabulary_mode($vocabulary->vid) & I18N_MODE_MULTIPLE) {

    $form['actions']['translate'] = array(

      '#type' => 'submit',

      '#name'   => 'save_translate',

      '#value' => t('Save and translate'),

      '#weight' => 5,

      '#states' => array(

        'invisible' => array(

          // Hide the button if term is language neutral.

          'select[name=language]' => array('value' => LANGUAGE_NONE),

        ),

      ),

    );

    // Make sure the delete buttons shows up last.

    if (isset($form['actions']['delete'])) {

      $form['actions']['delete']['#weight'] = 10;

    }

    $form['#submit'][] = 'i18n_taxonomy_form_term_submit';

  }

}

/**

 * Form submit callback to redirect when using the save and translate button.

 */

function i18n_taxonomy_form_term_submit($form, &$form_state) {

  if ($form_state['triggering_element']['#name'] == 'save_translate') {

    // When using the edit link on the list terms, a destination param is

    // added that needs to be unset to make the redirection work.

    unset($_GET['destination']);

    $form_state['redirect'] = 'taxonomy/term/' . $form_state['values']['tid'] . '/translate';

  }

}

/**

 * Implements hook_form_alter().

 *

 * This is the place to add language fields to all forms.

 *

 * @ TO DO The vocabulary form needs some javascript.

 */

function i18n_taxonomy_form_alter(&$form, $form_state, $form_id) {

  switch ($form_id) {

    case 'taxonomy_overview_vocabularies':

      $vocabularies = taxonomy_get_vocabularies();

      foreach ($vocabularies as $vocabulary) {

        if (i18n_object_langcode($vocabulary)) {

          $form[$vocabulary->vid]['name']['#markup'] .= ' (' . i18n_language_name($vocabulary->language) . ')';

        }

      }

      break;

    case 'taxonomy_overview_terms':

      // We check for vocabulary object first, because when confirming alphabetical ordering it uses the same form

      if (!empty($form['#vocabulary']) && i18n_taxonomy_vocabulary_mode($form['#vocabulary']->vid) & I18N_MODE_TRANSLATE) {

        foreach (element_children($form) as $key) {

          if (isset($form[$key]['#term']) && ($lang = i18n_object_langcode($form[$key]['#term']))) {

            $form[$key]['view']['#suffix'] = ' (' . i18n_language_name($lang) . ')';

          }

        }

      }

      break;

    case 'search_form':

      // Localize category selector in advanced search form.

      if (!empty($form['advanced']) && !empty($form['advanced']['category'])) {

        i18n_taxonomy_form_all_localize($form['advanced']['category']);

      }

      break;

  }

}

/**

 * Validate multilingual options for vocabulary form

 */

function i18n_taxonomy_form_vocabulary_validate($form, &$form_state) {

  if ($form_state['values']['i18n_mode'] & I18N_MODE_LANGUAGE) {

    if ($form_state['values']['language'] == LANGUAGE_NONE) {

      form_set_error('language', t('If selecting "Set language to vocabulary" you need to set a language to this vocabulary. Either change the translation mode or select a language.'));

    }

  }

  else {

    $form_state['values']['language'] = LANGUAGE_NONE;

  }

}

/**

 * Localize a taxonomy_form_all() kind of control

 *

 * The options array is indexed by vocabulary name and then by term id, with tree structure

 * We just need to localize vocabulary name and localizable terms. Multilingual vocabularies

 * should have been taken care of by query rewriting.

 **/

function i18n_taxonomy_form_all_localize(&$item) {

  $options = &$item['#options'];

  foreach (taxonomy_get_vocabularies() as $vid => $vocabulary) {

    if (!empty($options[$vocabulary->name])) {

      // Localize vocabulary name if translated

      $vname = i18n_taxonomy_vocabulary_name($vocabulary);

      if ($vname != $vocabulary->name) {

        $options[$vname] = $options[$vocabulary->name];

        unset($options[$vocabulary->name]);

      }

      if (i18n_taxonomy_vocabulary_mode($vid) & I18N_MODE_LOCALIZE) {

        $tree = taxonomy_get_tree($vid);

        if ($tree && (count($tree) > 0)) {

          foreach ($tree as $term) {

            if (isset($options[$vname][$term->tid])) {

              $options[$vname][$term->tid] = str_repeat('-', $term->depth) . i18n_taxonomy_term_name($term);

            }

          }

        }

      }

    }

  }

}

/**

 * Translate an array of taxonomy terms.

 *

 * Translates all terms with language, just passing over terms without it.

 * Filter out terms with a different language

 *

 * @param $taxonomy

 *   Array of term objects or tids or multiple arrays or terms indexed by vid

 * @param $langcode

 *   Language code of target language

 * @param $fullterms

 *   Whether to return full $term objects, returns tids otherwise

 * @return

 *   Array with translated terms: tid -> $term

 *   Array with vid and term array

 */

function i18n_taxonomy_translate_terms($taxonomy, $langcode, $fullterms = TRUE) {

  $translation = array();

  if (is_array($taxonomy) && $taxonomy) {

    foreach ($taxonomy as $index => $tdata) {

      if (is_array($tdata)) {

        // Case 1: Index is vid, $tdata is an array of terms

        $mode = i18n_taxonomy_vocabulary_mode($index);

        // We translate just some vocabularies: translatable, fixed language

        // Fixed language ones may have terms translated, though the UI doesn't support it

        if ($mode & I18N_MODE_LANGUAGE || $mode & I18N_MODE_TRANSLATE) {

          $translation[$index] = i18n_taxonomy_translate_terms($tdata, $langcode, $fullterms);

        }

        elseif ($fullterms) {

          $translation[$index] = array_map('_i18n_taxonomy_filter_terms', $tdata);

        }

        else {

          $translation[$index] = array_map('_i18n_taxonomy_filter_tids', $tdata);

        }

        continue;

      }

      elseif (is_object($tdata)) {

        // Case 2: This is a term object

        $term = $tdata;

      }

      elseif (is_numeric($tdata) && ($tid = (int)$tdata)) {

        // Case 3: This is a term tid, load the full term

        $term = taxonomy_term_load($tid);

      }

      // Translate the term if we got it

      if (empty($term)) {

        // Couldn't identify term, pass through whatever it is

        $translation[$index] = $tdata;

      }

      elseif ($term->language && $term->language != $langcode) {

        $translation_set = i18n_translation_set_load($term->i18n_tsid);

        $translations = $translation_set->get_translations();

        if ($translations && !empty($translations[$langcode])) {

          $newterm = $translations[$langcode];

          $translation[$newterm->tid] = $fullterms ? $newterm : $newterm->tid;

        }

      }

      else {

        // Term has no language. Should be ok.

        $translation[$index] = $fullterms ? $term : $term->tid;

      }

    }

  }

  return $translation;

}

/**

 * Localize taxonomy terms for localizable vocabularies.

 *

 * @param $terms

 *   Array of term objects or term object.

 * @return

 *   Array of terms with the right ones localized.

 */

function i18n_taxonomy_localize_terms($terms) {

  // If not localizable language just return. Performance optimizations.

  if (!i18n_string_translate_langcode()) {

    return $terms;

  }

  $object_info = i18n_object_info('taxonomy_term');

  $list = is_array($terms) ? $terms : array($terms);

  foreach ($list as $index => $term) {

    if (i18n_taxonomy_vocabulary_mode($term->vid, I18N_MODE_LOCALIZE)) {

      $localize[$index] = $term->tid;

    }

  }

  // If multiple terms, preload all translations, then run object translation.

  if (!empty($localize)) {

    i18n_string_translation_search(array('taxonomy', 'term', $localize, '*'));

    foreach ($localize as $index => $tid) {

      $list[$index] = i18n_string_object_translate('taxonomy_term', $list[$index]);

    }

  }

  // Return array or simple object, depending on incoming format.

  return is_array($terms) ? $list : reset($list);

}

/**

 * Taxonomy vocabulary settings.

 *

 * @param $vid

 *   Vocabulary object or vocabulary id.

 * @param $mode

 *   Vocabulary mode to compare with.

 *

 */

function i18n_taxonomy_vocabulary_mode($vid, $mode = NULL) {

  $modes = &drupal_static(__FUNCTION__);

  if (is_object($vid)) {

    $vid_mode = i18n_object_field($vid, 'i18n_mode', I18N_MODE_NONE);

    return isset($mode) ? $mode & $vid_mode : $vid_mode;

  }

  else {

    if (!isset($modes[$vid])) {

      $modes[$vid] = i18n_object_field(taxonomy_vocabulary_load($vid), 'i18n_mode', I18N_MODE_NONE);

    }

    return isset($mode) ? $mode & $modes[$vid] : $modes[$vid];

  }

}

/**

 * Get taxonomy tree for a given language

 *

 * @param $vid

 *   Vocabulary id

 * @param $lang

 *   Language code

 * @param $parent

 *   Parent term id for the tree

 */

function i18n_taxonomy_get_tree($vid, $langcode, $parent = 0, $max_depth = NULL, $load_entities = FALSE) {

  $children = &drupal_static(__FUNCTION__, array());

  $parents = &drupal_static(__FUNCTION__ . ':parents', array());

  $terms = &drupal_static(__FUNCTION__ . ':terms', array());

  // We cache trees, so it's not CPU-intensive to call get_tree() on a term

  // and its children, too.

  if (!isset($children[$vid][$langcode])) {

    $children[$vid][$langcode] = array();

    $parents[$vid][$langcode] = array();

    $terms[$vid][$langcode] = array();

    $query = db_select('taxonomy_term_data', 't');

    $query->join('taxonomy_term_hierarchy', 'h', 'h.tid = t.tid');

    $result = $query

      ->addTag('translatable')

      ->addTag('term_access')

      ->fields('t')

      ->fields('h', array('parent'))

      ->condition('t.vid', $vid)

      ->condition('t.language', $langcode)

      ->orderBy('t.weight')

      ->orderBy('t.name')

      ->execute();

    foreach ($result as $term) {

      $children[$vid][$langcode][$term->parent][] = $term->tid;

      $parents[$vid][$langcode][$term->tid][] = $term->parent;

      $terms[$vid][$langcode][$term->tid] = $term;

    }

  }

  // Load full entities, if necessary. The entity controller statically

  // caches the results.

  if ($load_entities) {

    $term_entities = taxonomy_term_load_multiple(array_keys($terms[$vid][$langcode]));

  }

  $max_depth = (!isset($max_depth)) ? count($children[$vid][$langcode]) : $max_depth;

  $tree = array();

  // Keeps track of the parents we have to process, the last entry is used

  // for the next processing step.

  $process_parents = array();

  $process_parents[] = $parent;

  // Loops over the parent terms and adds its children to the tree array.

  // Uses a loop instead of a recursion, because it's more efficient.

  while (count($process_parents)) {

    $parent = array_pop($process_parents);

    // The number of parents determines the current depth.

    $depth = count($process_parents);

    if ($max_depth > $depth && !empty($children[$vid][$langcode][$parent])) {

      $has_children = FALSE;

      $child = current($children[$vid][$langcode][$parent]);

      do {

        if (empty($child)) {

          break;

        }

        $term = $load_entities ? $term_entities[$child] : $terms[$vid][$langcode][$child];

        if (count($parents[$vid][$langcode][$term->tid]) > 1) {

          // We have a term with multi parents here. Clone the term,

          // so that the depth attribute remains correct.

          $term = clone $term;

        }

        $term->depth = $depth;

        unset($term->parent);

        $term->parents = $parents[$vid][$langcode][$term->tid];

        $tree[] = $term;

        if (!empty($children[$vid][$langcode][$term->tid])) {

          $has_children = TRUE;

          // We have to continue with this parent later.

          $process_parents[] = $parent;

          // Use the current term as parent for the next iteration.

          $process_parents[] = $term->tid;

          // Reset pointers for child lists because we step in there more often

          // with multi parents.

          reset($children[$vid][$langcode][$term->tid]);

          // Move pointer so that we get the correct term the next time.

          next($children[$vid][$langcode][$parent]);

          break;

        }

      } while ($child = next($children[$vid][$langcode][$parent]));

      if (!$has_children) {

        // We processed all terms in this hierarchy-level, reset pointer

        // so that this function works the next time it gets called.

        reset($children[$vid][$langcode][$parent]);

      }

    }

  }

  return $tree;

}

/**

 * Recursive array filtering, convert all terms to 'tid'.

 */

function _i18n_taxonomy_filter_tids($tid) {

  if (is_array($tid)) {

    return array_map('_i18n_taxonomy_filter_tids', $tid);

  }

  else {

    return is_object($tid) ? $tid->tid : (int)$tid;

  }

}

/**

 * Recursive array filtering, convert all terms to 'term object'

 */

function _i18n_taxonomy_filter_terms($term) {

  if (is_array($term)) {

    return array_map('_i18n_taxonomy_filter_terms', $term);

  }

  else {

    return is_object($term) ? $term : taxonomy_term_load($term);

  }

}

/**

 * Load translation set. Menu loading callback.

 */

function i18n_taxonomy_translation_set_load($tsid) {

  return i18n_translation_set_load($tsid, 'taxonomy_term');

}

/**

 * Implements hook_field_uuid_load().

 */

function i18n_taxonomy_field_uuid_load($entity_type, $entity, $field, $instance, $langcode, &$items) {

  taxonomy_field_uuid_load($entity_type, $entity, $field, $instance, $langcode, $items);

}

/**

 * Implements hook_field_uuid_presave().

 */

function i18n_taxonomy_field_uuid_presave($entity_type, $entity, $field, $instance, $langcode, &$items) {

  taxonomy_field_uuid_presave($entity_type, $entity, $field, $instance, $langcode, $items);

}

/**

 * Implements hook_entity_info_alter().

 */

function i18n_taxonomy_entity_info_alter(&$entity_info) {

  if (isset($entity_info['taxonomy_term'])) {

    // Core doesn't provide a label callback for taxonomy terms. By setting one

    // we can use it to return the correct localized term name.

    $entity_info['taxonomy_term']['label callback'] = 'i18n_taxonomy_taxonomy_term_label';

    // Also let core know terms have languages, now.

    $entity_info['taxonomy_term']['entity keys']['language'] = 'language';

  }

}

/**

 * Providing a hook_entity_info() 'label callback' to ensure modules that use

 * entity_label() get the correct localized taxonomy term.

 */

function i18n_taxonomy_taxonomy_term_label($term, $entity_type) {

  return i18n_taxonomy_term_name($term, i18n_language_interface()->language);

}

/**

 * Implements hook_views_api().

 */

function i18n_taxonomy_views_api() {

  return array(

    'api' => 3,

  );

}

/**

 * Implements hook_module_enabled().

 *

 * Updates options_list_callback for taxonomy term fields.

 *

 * @param $modules

 */

function i18n_taxonomy_modules_enabled($modules) {

  $modules = drupal_map_assoc($modules);

  if (isset($modules['i18n_taxonomy'])) {

    foreach (field_info_fields() as $fieldname => $field) {

      if ($field['type'] == 'taxonomy_term_reference') {

        $field['settings']['options_list_callback'] = 'i18n_taxonomy_allowed_values';

        field_update_field($field);

      }

    }

  }

}