<?php
// $Id: i18nviews.module,v 1.1.2.5 2007-04-25 19:07:02 jareyero Exp $

/**
 * @file
 * Views support for Internationalization (i18n) package
 *
 * This module uses i18n module namespace to add some views hooks
 * 
 * @author Jose A. Reyero, 2007
 */

/**
 * Views integration
 */
function i18n_views_tables() {
  $tables['i18n'] = array(
    'name' => 'i18n_node',
    'join' => array(
      'left' => array(
        'table' => 'node',
        'field' => 'nid'
      ),
      'right' => array(
        'field' => 'nid'
      )
    )
  );
  $tables['i18n']['fields']['language'] = array(
   'name' => t('Internationalization: Language'),
   'sortable' => true,
   'handler' => 'i18n_views_handler_language',
  );
  $tables['i18n']['filters']['language'] = array(
    'name' => t('Internationalization: Language'),
    'list-type' => 'list',
    'value-type' => 'array',
    'list' => 'i18n_views_language_list',
    'operator' => 'views_handler_operator_or',
    'help' => t('Enabled languages for content.'),
  );
  $tables['i18n']['filters']['extlanguage'] = array(
    'field' => 'language',
    'name' => t('Internationalization: Language (extended)'),
    'list-type' => 'list',
    'value-type' => 'array',
    'list' => 'i18n_views_language_list_all',
    'operator' => 'views_handler_operator_or',
    'help' => t('All defined languages for content.'),
  );  
  $tables['i18n']['filters']['selection'] = array(
    'name' => t('Internationalization: Selection'),
    'handler' => 'i18n_views_filter_handler',
    'list-type' => 'select',
    'operator' => array('=' => t('Is')),
    'list' => '_i18n_selection_mode',
    'help' => t('Content language.'),
    'cacheable' => 'no' // This query condition cannot be cached
  );
  return $tables;
}

function i18n_views_language_list($a, $b){
  return i18n_language_list();
}
function i18n_views_language_list_all($a, $b){
  return i18n_language_list(TRUE);
}
function i18n_views_handler_language($fieldinfo, $fielddata, $value, $data) {
  $languages = i18n_language_list(TRUE);
  return $languages[$value];
}

/**
 * Filter handler callback. Manages language selection mode
 */
function i18n_views_filter_handler($filterdata, $filterinfo, &$query) {
  if ($filterdata == 'handler' && $filterinfo['field'] == 'i18n.selection' && $mode = $filterinfo['value']) {
    // If this filter is used, rollback value set in pre_query and set the new one.
    i18n_selection_mode('reset');
    i18n_selection_mode($mode);
  } 
}
/**
 * Implementation of hook_views_pre_query().
 * 
 * Disable language conditions for views. This is called before filter handlers
 */
function i18n_views_pre_query(&$view) {
  // If any language filter, the language selection mode will be 'off'
  foreach($view->exposed_filter as $filter) {
    if($filter['field'] == 'i18n.language') {
      i18n_selection_mode('off');
      return;
    }
  }
  // If no filter, sets the one from settings for this view 
  i18n_selection_mode(variable_get('i18n_selection_mode', 'simple'));
}
/**
 * Implementation of hook_views_pre_view().
 * 
 * If used language selection filter, reset query rewriting again
 */
function i18n_views_pre_view(&$view, &$items) {
  i18n_selection_mode('reset');
}