<?php
/**
 * @file
 * Internationalization (i18n) package. Multilingual variables API.
 */

/**
 * The type of language used for variables.
 */
define('I18N_VARIABLE_LANGUAGE_TYPE', 'i18n_language_variable');

/**
 * Implements hook_language_init()
 */
function i18n_variable_language_init() {
  if (drupal_multilingual()) {
    module_invoke('variable_realm', 'initialize', 'language');
  }
}

/**
 * Implements hook_variable_realm_info().
 */
function i18n_variable_variable_realm_info() {
  $realm['language'] = array(
    'title' => t('Language'),
    'weight' => 100,
    'controller class' => 'I18nVariableLanguageRealm',
    'store class' => 'VariableStoreRealmStore',
    // Variables for this realm can be selected from a list.
    'select' => TRUE,
    'select path' => 'admin/config/regional/i18n/variable',
    // Name for variables that belong to this realm: 'multilingual' variable/s
    'variable name' => t('multilingual'),
    'variable class' => 'i18n-variable',
    // Automatically handle these variables in system settings forms.
    'form settings' => TRUE,
    'form switcher' => TRUE,
  );
  return $realm;
}

/**
 * Implements hook_menu()
 */
function i18n_variable_menu() {
  $items['admin/config/regional/i18n/variable'] = array(
    'title' => 'Variables',
    'description' => 'Configure multilingual variables.',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('variable_realm_select_variables_form', 'language'),
    'access arguments' => array('administer site configuration'),
    'file' => 'variable_realm.form.inc',
    'file path' => drupal_get_path('module', 'variable_realm'),
    'type' => MENU_LOCAL_TASK,
  );
  return $items;
}


/**
 * Get variables language, make sure it is initialized
 */
function i18n_variable_language() {
  // If we've got a variables language, it will be that one
  if (!isset($GLOBALS[I18N_VARIABLE_LANGUAGE_TYPE])) {
    $GLOBALS[I18N_VARIABLE_LANGUAGE_TYPE] = i18n_language_interface();
  }
  return $GLOBALS[I18N_VARIABLE_LANGUAGE_TYPE];
}

/**
 * Get original value for global variable/s
 */
function i18n_variable_global($name = NULL, $default = NULL) {
  return variable_realm_global_get($name, $default);
}

/**
 * Get list of multilingual variables or check whether a variable is multilingual
 */
function i18n_variable_list($name = NULL) {
  $variables = &drupal_static(__FUNCTION__);
  if (!isset($variables)) {
    $variables = variable_children(variable_get('variable_realm_list_language', array()));
  }
  return $name ? in_array($name, $variables) : $variables;
}

/**
* Load language variables into array.
*
* Pull variables from the store but filter out the ones that are not multilingual.
*/
function i18n_variable_load($langcode) {
  $variables = array();
  foreach (variable_store('language', $langcode) as $name => $value) {
    if (i18n_variable_list($name)) {
      $variables[$name] = $value;
    }
  }
  return $variables;
}

/**
 * Set a persistent language dependent variable.
 *
 * @param $name
 *   The name of the variable to set.
 * @param $value
 *   The value to set. This can be any PHP data type; these functions take care
 *   of serialization as necessary.
 * @param $langcode
 *   Language code.
 */
function i18n_variable_set($name, $value, $langcode) {
  variable_realm_set('language', $langcode, $name, $value);
}

/**
 * Get single multilingual variable
 */
function i18n_variable_get($name, $langcode, $default = NULL) {
  return variable_realm_get('language', $langcode, $name, $default);
}

/**
 * Unset a persistent multilingual variable.
 *
 * @param $name
 *   The name of the variable to undefine.
 * @param $langcode
 *   Language code.
 */
function i18n_variable_del($name, $langcode) {
  variable_realm_del('language', $langcode, $name);
}