<?php
// $Id: spaces_customtext.module,v 1.1.2.3 2010-07-02 17:38:16 jmiccolis Exp $

/**
 * @file
 *
 * Spaces Custom Text.
 *
 * Because of an unclearable static cache in t(), spaces_customtext must
 * implement a rather unusual sequence of events to allow the custom strings
 * variable to take effect for a given space. In particular, t() can be called
 * very early in the Drupal bootstrap, potentially before the initialization
 * of the active space for a given page. If this occurs, t() will static cache
 * the locale_custom_text_[langcode] strings before spaces can override them.
 *
 * To get around this problem, spaces_customtext does the following:
 *
 * - Ensures that it has the lowest weight possible in the {system} table. This
 *   means that barring a call to t() in hook_boot(), spaces_customtext_init()
 *   will run *before* any calls to t().
 *
 * - In spaces_customtext_init(), the global language langcode is switched
 *   to a temporary placeholder.
 *
 * - **WARNING: Any calls to t() that occur between spaces_customtext_init()
 *   and the initialization of a space will not be properly translated or
 *   customized.**
 *
 * - When a space is inited, variable overrides are loaded and the global
 *   language langcode is restored to its initial value. If no space is
 *   activated by spaces_init(), spaces will return the langcode to its
 *   initial value.
 *
 * - Any subsequent calls to t() will use any custom overrides that exist for
 *   the active space.
 */

/**
 * Implementation of hook_requirements()
 */
function spaces_customtext_requirements($phase) {
  $requirements = array();
  $t = get_t();

  if ($phase == 'runtime') {
    if (module_exists('locale')) {
      $requirements['spaces_customtext'] = array(
        'title' => $t('Spaces Custom Text compatibility'),
        'description' => $t('Spaces Custom Text is not compatible with the Locale module. Either Spaces Custom Text or Locale must be disabled.'),
        'severity' => REQUIREMENT_ERROR,
        'value' => $t('Incompatible'),
      );
    }
  }
  return $requirements;
}

/**
 * Implementation of hook_enable().
 * Weight spaces_customtext as the lowest possible module.
 */
function spaces_customtext_enable() {
  $min = db_result(db_query("SELECT weight FROM {system} WHERE type = 'module' ORDER BY weight ASC LIMIT 1"));
  $weight = $min < -10000 ? $min - 1 : -10000;
  db_query("UPDATE {system} SET weight = %d WHERE name = 'spaces_customtext' AND type = 'module'", $weight);
}

/**
 * Implementation of hook_init().
 */
function spaces_customtext_init() {
  global $language;
  spaces_customtext_cache($language->language);
  $language->language = 'spaces_customtext';
}

/**
 * Simple static cache for storing the actual language code for the current
 * page request.
 */
function spaces_customtext_cache($langcode = NULL, $reset = FALSE) {
  static $cache;
  if ($reset) {
    unset($cache);
  }
  $cache = isset($langcode) ? $langcode : $cache;
  return isset($cache) ? $cache : NULL;
}

/**
 * Implementation of hook_spaces_plugins().
 */
function spaces_customtext_spaces_plugins() {
  return array(
    'spaces_controller_customtext' => array(
      'handler' => array(
        'path' => drupal_get_path('module', 'spaces_customtext') .'/plugins',
        'file' => 'spaces_controller_customtext.inc',
        'class' => 'spaces_controller_customtext',
        'parent' => 'spaces_controller_variable',
      ),
    ),
  );
}

/**
 * Implementation of hook_menu().
 */
function spaces_customtext_menu() {
  return array(
    'features/customtext/%' => array(
      'access callback' => 'spaces_customtext_menu_access',
      'access arguments' => array(),
      'file' => 'spaces_customtext.admin.inc',
      'page callback' => 'drupal_get_form',
      'page arguments' => array('spaces_customtext_settings_form', 2),
      'title' => 'Settings',
      'type' => MENU_CALLBACK,
    ),
  );
}

/**
 * Access callback for custom text.
 */
function spaces_customtext_menu_access() {
  return spaces_access_admin() && user_access('administer string overrides');
}

/**
 * Implementation of hook_form_alter() for spaces_features_form.
 */
function spaces_customtext_form_spaces_features_form_alter(&$form, &$form_state) {
  $parent = menu_get_item();
  foreach (element_children($form['settings']) as $feature) {
    $link = l(t('Customize text'), "{$parent['href']}/customtext/{$feature}");
    $link = !empty($form['settings'][$feature]['#value']) ? " | {$link}" : $link;
    $form['settings'][$feature]['#value'] .= $link;
  }
}

/**
 * Implementation of hook_theme().
 */
function spaces_customtext_theme() {
  return array(
    'spaces_customtext_settings_form' => array(
      'arguments' => array(),
    ),
  );
}

/**
 * Implementation of hook_perm().
 * Note that this is the same perm provided by the stringoverrides module.
 */
function spaces_customtext_perm() {
  return array('administer string overrides');
}