<?php
// $Id: i18nblocks.module,v 1.7.2.12 2008-11-16 13:37:11 jareyero Exp $

/**
 * @file
 * Internationalization (i18n) submodule: Multilingual meta-blocks
 *
 * @author Jose A. Reyero, 2005
 *
 * @ TODO Add strings on block update.
 */

// Tag for localizable block, cannot be any language.
define('I18N_BLOCK_LOCALIZE', '__LOCALIZE__');

// Block type: localizable
define('I18N_BLOCK_LOCALIZABLE', 1);
// Block type: block with language
define('I18N_BLOCK_LANGUAGE', 0);

/**
 * Block types
 */
function _block_types() {
  return array(
    I18N_BLOCK_LOCALIZE => t('Localizable block'),
    I18N_BLOCK_METABLOCK => t('Multilingual block (Metablock)'),
  );
}

/**
 * Implementation of hook_help().
 */
function i18nblocks_help($path, $arg) {
  switch ($path) {
    case 'admin/help#i18nblocks':
      $output = '<p>'. t('This module provides support for multilingual blocks.') .'</p>';
      $output .= '<p>'. t('You can set up a language for a block or define it as translatable:') .'</p>';
      $output .= '<ul>';
      $output .= '<li>'. t('Blocks with a language will be displayed only in pages with that language.') .'</li>';
      $output .= '<li>'. t('Translatable blocks can be translated using the localization interface.') .'</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/build/translate'))) .'</p>';
      return $output;
  }
}

/**
 * Implementation of hook_db_rewrite_sql().
 */
function i18nblocks_db_rewrite_sql($query, $primary_table, $primary_key) {
  global $language;
  if ($primary_table == 'b' && $primary_key == 'bid') {
    $return['join'] = 'LEFT JOIN {i18n_blocks} i18n ON b.module = i18n.module AND b.delta = i18n.delta';
    $return['where'] = i18n_db_rewrite_where('i18n', 'block', 'simple');
    return $return;
  }
}

/**
 * Implementation of hook_block().
 *
 * Blocks in i18n_blocks with no language are suppossed to be translatable.
 */
/*
function i18nblocks_block($op = 'list', $delta = 0, $edit = array()) {
  switch($op) {
    case 'list':
      $blocks = array();
      $result = db_query("SELECT i.*, b.info FROM {i18n_blocks} i INNER JOIN {boxes} b ON i.delta = b.bid WHERE i.module = 'block' AND i.language = ''");
      while ($data = db_fetch_object($result)) {
        $blocks[$data->ibid]['info'] = $data->info . t('[Translatable]');
      }
      return $blocks;

    case 'view':
      return i18nblocks_get_block($delta, i18n_get_lang());
      break;

    case 'configure':
      $form['i18nblocks']['#value'] = t('This is a localizable block.');
      return $form;
  }
}*/

/**
 * Implementation of hook_locale().
 *
 * This one doesn't need locale refresh because strings are stored from module config form.
 */
function i18nblocks_locale($op = 'groups', $group = NULL) {
  switch ($op) {
    case 'groups':
      return array('blocks' => t('Blocks'));
  }
}

/**
 * Implementation of block form_alter().
 *
 * Remove block title for multilingual blocks.
 */
function i18nblocks_form_alter(&$form, $form_state, $form_id) {
  if (($form_id == 'block_admin_configure' || $form_id == 'block_box_form' || $form_id == 'block_add_block_form')) {
    $module = $form['module']['#value'];
    $delta = $form['delta']['#value'];
    $form['i18n'] = array(
      '#type' => 'fieldset',
      '#title' => t('Multilingual settings'),
      '#collapsible' => TRUE,
      '#weight' => -1,
    );
    // For i18nblocks, just a help text.
    if ($module == 'i18nblocks') {
      $form['i18n']['text'] = array('#value' => t('This is a translatable block.'));
      // Unset block title
      unset($form['block_settings']['title']);
      $form['block_settings']['title'] = array(
        '#type' => 'value',
        '#value' => ''
      );
    }
    else {
      $i18nblock = i18nblocks_load($module, $delta);
      $form['i18n'] = array(
        '#type' => 'fieldset',
        '#title' => t('Multilingual settings'),
        '#collapsible' => TRUE,
        '#weight' => 0,
      );
      // Language options will depend on block type.
      $options = array('' => t('All languages'));
      if ($module == 'block') {
        $options[I18N_BLOCK_LOCALIZE] = t('All languages (Translatable)');
      }
      $options += locale_language_list('name');

      $form['i18n']['language'] = array(
        '#type' => 'radios',
        '#title' => t('Language'),
        '#default_value' => $i18nblock->language,
        '#options' => $options,
      );
      // Pass i18ndelta value.
      $form['i18n']['ibid'] = array('#type' => 'value', '#value' => $i18nblock->ibid);
      $form['#submit'][] = 'i18nblocks_form_submit';
    }
  }
}

/**
 * Forms api callback. Submit function.
 */
function i18nblocks_form_submit($form, &$form_state) {
  $values = $form_state['values'];
  // Dirty trick to act on new created blocks. Delta may be zero for other modules than block.
  if (!$values['delta'] && $values['module'] == 'block') {
    // The last insert id will return a different value in mysql
    //$values['delta'] = db_last_insert_id('boxes', 'bid');
    $values['delta'] = db_result(db_query("SELECT MAX(bid) FROM {boxes}"));
  }
  switch ($values['language']) {
    case I18N_BLOCK_LOCALIZE:
      // Translatable block.
      $values['language'] = '';
      i18nblocks_save($values);
      break;

    case '':
      // No language, delete all i18n information.
      if ($values['ibid']) {
        db_query("DELETE FROM {i18n_blocks} WHERE ibid = %d", $values['ibid']);
      }
      break;

    default:
      // The block has a language.
      i18nblocks_save($values);
  }
}

/**
 * Get block language data.
 */
function i18nblocks_load($module, $delta) {
  $block = db_fetch_object(db_query("SELECT * FROM {i18n_blocks} WHERE module = '%s' AND delta = '%s'", $module, $delta));
  // If no result, return default settings
  if ($block && !$block->language) {
    $block->language = I18N_BLOCK_LOCALIZE;
  }
  return $block ? $block : (object)array('language' => '', 'ibid' => 0);
}

/**
 * Set block language data.
 *
 * @param array $block
 *   Array of block parameters: module, delata, ibid (internal i18nblocks delta).
 */
function i18nblocks_save($block) {
  // Update strings for localizable blocks.
  if ($block['ibid']) {
    db_query("UPDATE {i18n_blocks} SET language = '%s' WHERE ibid = %d", $block['language'], $block['ibid']);
  }
  else {
    db_query("INSERT INTO {i18n_blocks}(module, delta, language) VALUES('%s', '%s', '%s')", $block['module'], $block['delta'], $block['language']);
    $block['ibid'] = db_last_insert_id('i18n_blocks', 'ibid');
  }
  if (!$block['language']) {
    // We use ibid property instead of block's delta as block id for strings
    $delta = $block['ibid'];
    tt("blocks:block:$delta:title", $block['title'], NULL, TRUE);
    tt("blocks:block:$delta:content", $block['body'], NULL, TRUE);
  }
}

/**
 * Load and translate block data.
 *
 * @param $delta
 *   Block id
 * @param $language
 *   Language to localize the block.
 */
function i18nblocks_get_block($delta, $language) {
  // Get block metadata.
  $meta = db_fetch_object(db_query("SELECT b.* FROM {blocks} b INNER JOIN {i18n_blocks} i ON i.delta = b.delta AND i.module = b.module WHERE i.ibid = '%d'", $delta));
  // Get block data from module.
  $block = module_invoke($meta->module, 'block', 'view', $meta->delta);

  if ($block) {
    // Override the default title.
    if ($meta->title) {
      // Check plain here to allow module generated titles to keep any markup.
      $block['subject'] = $meta->title == '<none>' ? '' : check_plain(tt("blocks:block:$delta:title", $meta->title, $language));
    }
    elseif (!empty($block['subject'])) {
      $block['subject'] = tt("blocks:block:$delta:title", $block['subject'], $language);
    }
    $block['content'] = tt("blocks:block:$delta:content", $block['content'], $language);
    return $block;
  }
}

/**
 * Translate localizable block.
 * 
 * @param $block
 *   Core block object
 * @param $info
 *   Translation info from i18n
 */
function i18nblocks_translate_block($block, $info) {
  // The block id will be i18n's ibid instead of block delta
  $bid = $info->ibid;
  if ($block->title) {
    // Check plain here to allow module generated titles to keep any markup.
    $block->subject = $block->title == '<none>' ? '' : check_plain(tt("blocks:block:$bid:title", $block->title));
  }
  elseif (!empty($block->subject)) {
    $block->subject = tt("blocks:block:$bid:title", $block->subject);
  }
  $block->content = tt("blocks:block:$bid:content", $block->content);
  return $block;
}

/**
 * Implementation of hook_theme().
 *
 * This will be used to override the theme_blocks() definition.
 */
function i18nblocks_theme() {
  return array(
    'i18nblocks' => array(
      'function' => 'i18nblocks_theme_blocks',
      'arguments' => array('region' => NULL),
    ),
  );
}

/**
 * Implementation of hook theme_registry_alter().
 *
 * Replace theme_blocks with theme_i18nblocks. There may be a better way to do this but
 * I cannot figure out an easier way to build the whole registry entry.
 *
 * Warning: this can mess with themes implementing the _blocks function.
 */
function i18nblocks_theme_registry_alter(&$theme_registry) {
  $theme_registry['blocks'] = $theme_registry['i18nblocks'];
}

/**
 * Overrides theme_blocks() and translates blocks on the go.
 */
function i18nblocks_theme_blocks($region) {
  $output = '';
  $i18nmenu = module_exists('i18nmenu');
  $i18nblocks = _i18nblocks_list();
  if ($list = block_list($region)) {
    foreach ($list as $key => $block) {
      // Configurable blocks, may be localizable.
      if ($block->module == 'block') {
        if (isset($i18nblocks['block'][$block->delta])) {
          $block = i18nblocks_translate_block($block, $i18nblocks['block'][$block->delta]);
        }
      }
      elseif ($i18nmenu) {
        // Replace menu blocks by their translated version.
        if ($block->module == 'menu') {
          $block->content = i18nmenu_translated_tree($block->delta);
        }
        elseif ($block->module == 'user' && $block->delta == 1) {
          $block->content = i18nmenu_translated_tree('navigation');
        }
      }
      // Finally, render the block using standard theming.
      $output .= theme('block', $block);
    }
  }

  // Add any content assigned to this region through drupal_set_content() calls.
  $output .= drupal_get_content($region);

  return $output;
}

/**
 * Get list of blocks i18n properties
 */
function _i18nblocks_list($langcode = '') {
  static $list = array();

  // Handle issues when no $langcode, use a different array index
  $index = $langcode ? $langcode : I18N_BLOCK_LOCALIZE;

  if (!isset($list[$index])) {
    $list[$index] = array();
    $result = db_query("SELECT * FROM {i18n_blocks} WHERE language = '%s'", $langcode);
    while ($info = db_fetch_object($result)) {
      $list[$index][$info->module][$info->delta] = $info;
    }
  }
  return $list[$index];
}