<?php

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

/**
 * Implements hook_menu().
 *
 * Add translate tab to blocks.
 */
function i18n_block_menu() {
  $items['admin/structure/block/manage/%/%/translate'] = array(
    'title' => 'Translate',
    'access callback' => 'i18n_block_translate_tab_access',
    'access arguments' => array(4, 5),
    'page callback' => 'i18n_block_translate_tab_page',
    'page arguments' => array(4, 5),
    'type' => MENU_LOCAL_TASK,
    'context' => MENU_CONTEXT_PAGE | MENU_CONTEXT_INLINE,
    'weight' => 10,
  );
  $items['admin/structure/block/manage/%/%/translate/%i18n_language'] = array(
    'title' => 'Translate',
    'access callback' => 'i18n_block_translate_tab_access',
    'access arguments' => array(4, 5),
    'page callback' => 'i18n_block_translate_tab_page',
    'page arguments' => array(4, 5, 7),
    'type' => MENU_CALLBACK,
    'weight' => 10,
  );
  return $items;
}

/**
 * Implements hook_permission().
 */
function i18n_block_permission() {
  return array(
    'translate blocks' => array(
      'title' => t('Translate Blocks'),
    ),
  );
}

/**
 * Implement hook_menu_alter().
 *
 * Reorganize block tabs so that they make sense.
 */
function i18n_block_menu_alter(&$items) {
  // Give the configure tab a short name and make it display.
  $items['admin/structure/block/manage/%/%/configure']['weight'] = -100;
  $items['admin/structure/block/manage/%/%/configure']['title'] = 'Configure';
  $items['admin/structure/block/manage/%/%/configure']['context'] = MENU_CONTEXT_PAGE | MENU_CONTEXT_INLINE;
  // Hide the delete tab. Not sure why this was even set a local task then
  // set to not show in any context...
  $items['admin/structure/block/manage/%/%/delete']['type'] = MENU_CALLBACK;
}

/**
 * Menu access callback function.
 *
 * Only let blocks translated which are configured to be translatable.
 */
function i18n_block_translate_tab_access($module, $delta) {
  $block = block_load($module, $delta);
  return (user_access('translate interface') || user_access('translate blocks')) && $block && isset($block->i18n_mode) && ($block->i18n_mode == I18N_MODE_LOCALIZE);
}

/**
 * Build a translation page for the given block.
 */
function i18n_block_translate_tab_page($module, $delta, $language = NULL) {
  $block = block_load($module, $delta);
  return i18n_string_object_translate_page('block', $block, $language);
}

/**
 * Implements hook_block_list_alter().
 *
 * Translate localizable blocks.
 *
 * To be run after all block visibility modules have run, just translate the blocks to be displayed
 */
function i18n_block_block_list_alter(&$blocks) {
  global $theme_key, $language;

  // Build an array of node types for each block.
  $block_languages = array();
  $result = db_query('SELECT module, delta, language FROM {i18n_block_language}');
  foreach ($result as $record) {
    $block_languages[$record->module][$record->delta][$record->language] = TRUE;
  }

  foreach ($blocks as $key => $block) {
    if (!isset($block->theme) || !isset($block->status) || $block->theme != $theme_key || $block->status != 1) {
      // This block was added by a contrib module, leave it in the list.
      continue;
    }
    if (isset($block_languages[$block->module][$block->delta]) && !isset($block_languages[$block->module][$block->delta][$language->language])) {
      // Block not visible for this language
      unset($blocks[$key]);
    }
  }
}

/**
 * Implements hook_block_view_alter().
 */
function i18n_block_block_view_alter(&$data, $block) {
  if (!empty($block->i18n_mode)) {
    if (!empty($block->title) && $block->title != '<none>') {
      // Unfiltered, as $block->subject will be created later from the title.
      $data['title'] = i18n_string(array('blocks', $block->module, $block->delta, 'title'), $block->title, array('sanitize' => FALSE));
    }
    if ($block->module == 'block' && isset($data['content'])) {
      $data['content'] = i18n_string(array('blocks', $block->module, $block->delta, 'body'), $data['content']);
    }
  }
}

/**
 * Implements hook_context_block_info_alter().
 */
function i18n_block_context_block_info_alter(&$block_info) {
  $theme_key = variable_get('theme_default', 'garland');
  $result = db_select('block')
    ->fields('block', array('module', 'delta', 'i18n_mode'))
    ->condition('theme', $theme_key)
    ->execute();
  foreach ($result as $row) {
    if (isset($block_info["{$row->module}-{$row->delta}"])) {
      $block_info["{$row->module}-{$row->delta}"]->i18n_mode = $row->i18n_mode;
    }
  }
}

/**
 * Implements hook_help().
 */
function i18n_block_help($path, $arg) {
  switch ($path) {
    case 'admin/help#i18n_block':
      $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/config/regional/translate'))) . '</p>';
      return $output;
    case 'admin/config/regional/i18n':
      $output = '<p>'. t('To set up multilingual options for blocks go to the <a href="@configure_blocks">Blocks administration page</a>.', array('@configure_blocks' => url('admin/structure/block'))) .'</p>';
      return $output;
  }
}

/**
 * Remove strings for deleted custom blocks.
 */
function i18n_block_block_delete_submit(&$form, $form_state) {
  $delta = $form_state['values']['delta'];
  // Delete stored strings for the title and content fields.
  i18n_string_remove("blocks:block:$delta:title");
  i18n_string_remove("blocks:block:$delta:body");
}

/**
 * Implements block hook_form_FORM_ID_alter().
 *
 * Remove block title for multilingual blocks.
 */
function i18n_block_form_block_add_block_form_alter(&$form, &$form_state, $form_id) {
  //i18n_block_alter_forms($form, $form_state, $form_id);
  i18n_block_form_block_admin_configure_alter($form, $form_state, $form_id);
}

/**
 * Implements block hook_form_FORM_ID_alter().
 *
 * Remove block title for multilingual blocks.
 */
function i18n_block_form_block_admin_configure_alter(&$form, &$form_state, $form_id) {
  $form['i18n_block']['languages'] = array(
    '#type' => 'fieldset',
    '#title' => t('Languages'),
    '#collapsible' => TRUE,
    '#collapsed' => TRUE,
    '#group' => 'visibility',
    '#weight' => 5,
    '#attached' => array(
      'js' => array(drupal_get_path('module', 'i18n_block') . '/i18n_block.js'),
    ),
  );

  // Add translatable option, just title for module blocks, title and content
  // for custom blocks.
  $description = '';
  $module = $form['module']['#value'];
  $delta = $form['delta']['#value'];

  // User created menus are exposed by the menu module, others by system.module.
  if ($module == 'menu' || ($module == 'system' && !in_array($delta, array('mail', 'help', 'powered-by')))) {
    $description = t('To translate the block content itself, <a href="@menu_translate_url">translate the menu</a> that is being shown.', array('@menu_translate_url' => url('admin/structure/menu/manage/' . $form['delta']['#value'])));
  }
  elseif ($module == 'views' && module_exists('i18nviews')) {
    $name = substr($delta, 0, strpos($delta, '-'));
    $description = t('To translate the block content itself, <a href="@views_translate_url">translate the view</a> that is being shown.', array('@views_translate_url' => url('admin/structure/views/view/' . $name . '/translate')));
  }
  elseif ($module != 'block') {
    $description = t('This block has generated content, only the title can be translated here.');
  }

  $block = block_load($form['module']['#value'], $form['delta']['#value']);
  $form['i18n_block']['languages']['i18n_mode'] = array(
    '#type' => 'checkbox',
    '#title' => t('Make this block translatable'),
    '#default_value' => isset($block->i18n_mode) ? $block->i18n_mode : I18N_MODE_NONE,
    '#description' => $description,
  );

  // Add option to select which language pages to show on.
  $default_options = db_query("SELECT language FROM {i18n_block_language} WHERE module = :module AND delta = :delta", array(
    ':module' => $form['module']['#value'],
    ':delta' => $form['delta']['#value'],
  ))->fetchCol();
  $form['i18n_block']['languages']['languages'] = array(
    '#type' => 'checkboxes',
    '#title' => t('Show this block for these languages'),
    '#default_value' => $default_options,
    '#options' => i18n_language_list(),
    '#description' => t('If no language is selected, block will show regardless of language.'),
  );
  if (user_access('translate interface') || user_access('translate blocks')) {
    $form['actions']['translate'] = array(
      '#type' => 'submit',
      '#name'   => 'save_translate',
      '#value' => t('Save and translate'),
      '#states' => array(
        'visible' => array(
          // The value must be a string so that the javascript comparison works.
          ":input[name=i18n_mode]" => array('checked' => TRUE),
        ),
      ),
    );
  }
  $form['#submit'][] = 'i18n_block_form_block_admin_configure_submit';
}

/**
 * Form submit handler for block configuration form.
 *
 * @see i18n_block_form_block_admin_configure_alter()
 */
function i18n_block_form_block_admin_configure_submit(&$form, &$form_state) {
  $module = $form_state['values']['module'];
  $delta = $form_state['values']['delta'];

  // Update block languages
  db_delete('i18n_block_language')
    ->condition('module', $module)
    ->condition('delta', $delta)
    ->execute();
  $query = db_insert('i18n_block_language')->fields(array('language', 'module', 'delta'));
  foreach (array_filter($form_state['values']['languages']) as $language) {
    $query->values(array(
      'language' => $language,
      'module' => $module,
      'delta' => $delta,
    ));
  }
  $query->execute();
  // Update block translation options and strings
  if (isset($form_state['values']['i18n_mode'])) {
    db_update('block')
      ->fields(array('i18n_mode' => $form_state['values']['i18n_mode']))
      ->condition('module', $module)
      ->condition('delta', $delta)
      ->execute();
    i18n_block_update_strings($form_state['values'], $form_state['values']['i18n_mode']);

    // If the save and translate button was clicked, redirect to the translate
    // tab instead of the block overview.
    if ($form_state['triggering_element']['#name'] == 'save_translate') {
      $form_state['redirect'] = 'admin/structure/block/manage/' . $module . '/' . $delta . '/translate';
    }
  }
}

/**
 * Update block strings
 */
function i18n_block_update_strings($block, $i18n_mode = TRUE) {
  $title = $i18n_mode && $block['title'] !== '<none>' ? $block['title'] : '';
  i18n_string_update(array('blocks', $block['module'], $block['delta'], 'title'), $title);
  if (isset($block['body'])) {
    if ($i18n_mode) {
      i18n_string_update(array('blocks', $block['module'], $block['delta'], 'body'), $block['body']['value'], array('format' => $block['body']['format']));
    }
    else {
      i18n_string_remove(array('blocks', $block['module'], $block['delta'], 'body'));
    }
  }
}

/**
 * Implements hook_form_FORMID_alter().
 *
 * Adds node specific submit handler to delete custom block form.
 *
 * @see block_custom_block_delete()
 */
function i18n_block_form_block_custom_block_delete_alter(&$form, &$form_state) {
  $form['#submit'][] = 'i18n_block_form_block_custom_block_delete_submit';
}

/**
 * Form submit handler for custom block delete form.
 *
 * @see node_form_block_custom_block_delete_alter()
 */
function i18n_block_form_block_custom_block_delete_submit($form, &$form_state) {
  db_delete('i18n_block_language')
    ->condition('module', 'block')
    ->condition('delta', $form_state['values']['bid'])
    ->execute();
  // Remove related strings
  module_invoke('i18n_strings', 'remove',
    array('blocks', 'block', $form_state['values']['bid']),
    array('title', 'body')
  );
}

/**
 * Translate block.
 *
 * @param $block
 *   Core block object
 */
function i18n_block_translate_block($block) {
  if (!empty($block->content) && $localizable) {
    $block->content = i18n_string_text("blocks:$block->module:$block->delta:body", $block->content);
  }
  // If it has a custom title, localize it
  if (!empty($block->title) && $block->title != '<none>') {
    // Check plain here to allow module generated titles to keep any markup.
    $block->subject = i18n_string_plain("blocks:$block->module:$block->delta:title", $block->subject);
  }
  return $block;
}