<?php

/**
 * @file
 * Install, update, and uninstall functions for the Search module.
 */

/**
 * Implements hook_schema().
 */
function search_schema() {
  $schema['search_dataset'] = array(
    'description' => 'Stores items that will be searched.',
    'fields' => array(
      'sid' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Search item ID, e.g. node ID for nodes.',
      ),
      'langcode' => array(
        'type' => 'varchar',
        'length' => '12',
        'not null' => TRUE,
        'description' => 'The {languages}.langcode of the item variant.',
        'default' => '',
      ),
      'type' => array(
        'type' => 'varchar',
        'length' => 16,
        'not null' => TRUE,
        'description' => 'Type of item, e.g. node.',
      ),
      'data' => array(
        'type' => 'text',
        'not null' => TRUE,
        'size' => 'big',
        'description' => 'List of space-separated words from the item.',
      ),
      'reindex' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Set to force node reindexing.',
      ),
    ),
    'primary key' => array('sid', 'langcode', 'type'),
  );

  $schema['search_index'] = array(
    'description' => 'Stores the search index, associating words, items and scores.',
    'fields' => array(
      'word' => array(
        'type' => 'varchar',
        'length' => 50,
        'not null' => TRUE,
        'default' => '',
        'description' => 'The {search_total}.word that is associated with the search item.',
      ),
      'sid' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => 'The {search_dataset}.sid of the searchable item to which the word belongs.',
      ),
      'langcode' => array(
        'type' => 'varchar',
        'length' => '12',
        'not null' => TRUE,
        'description' => 'The {languages}.langcode of the item variant.',
        'default' => '',
      ),
      'type' => array(
        'type' => 'varchar',
        'length' => 16,
        'not null' => TRUE,
        'description' => 'The {search_dataset}.type of the searchable item to which the word belongs.',
      ),
      'score' => array(
        'type' => 'float',
        'not null' => FALSE,
        'description' => 'The numeric score of the word, higher being more important.',
      ),
    ),
    'indexes' => array(
      'sid_type' => array('sid', 'langcode', 'type'),
    ),
    'foreign keys' => array(
      'search_dataset' => array(
        'table' => 'search_dataset',
        'columns' => array(
          'sid' => 'sid',
          'langcode' => 'langcode',
          'type' => 'type',
        ),
      ),
    ),
    'primary key' => array('word', 'sid', 'langcode', 'type'),
  );

  $schema['search_total'] = array(
    'description' => 'Stores search totals for words.',
    'fields' => array(
      'word' => array(
        'description' => 'Primary Key: Unique word in the search index.',
        'type' => 'varchar',
        'length' => 50,
        'not null' => TRUE,
        'default' => '',
      ),
      'count' => array(
        'description' => "The count of the word in the index using Zipf's law to equalize the probability distribution.",
        'type' => 'float',
        'not null' => FALSE,
      ),
    ),
    'primary key' => array('word'),
  );

  return $schema;
}

/**
 * Update search module to use the configuration system.
 *
 * @ingroup config_upgrade
 */
function search_update_8000() {
  // Run this first so the config is sure to be empty.
  _search_update_8000_modules_mapto_plugins(array('user' => 'user_search', 'node' => 'node_search'));
  $active_plugins = \Drupal::config('search.settings')->get('active_plugins');
  update_variables_to_config('search.settings', array(
   'minimum_word_size' => 'index.minimum_word_size',
   'overlap_cjk' => 'index.overlap_cjk',
   'search_cron_limit' => 'index.cron_limit',
   'search_tag_weights' => 'index.tag_weights',
   'search_and_or_limit' => 'and_or_limit',
  ));
  // update_variables_to_config() merges in all the default values from the YAML
  // file, so we need re-save the list of active plugins we found.
  \Drupal::config('search.settings')->set('active_plugins', $active_plugins)->save();
}

/**
 * Update search module variables to plugin IDs.
 *
 * This function may also be called by contributed modules that implement a
 * search plugin that is an update of a hook_search_info() implementation.
 */
function _search_update_8000_modules_mapto_plugins(array $map) {
  $active_modules = update_variable_get('search_active_modules', array('node', 'user'));
  $config = \Drupal::config('search.settings');
  $active_plugins = $config->get('active_plugins');
  foreach($active_modules as $idx => $module) {
    if (isset($map[$module])) {
      $plugin_id = $map[$module];
      $active_plugins[$plugin_id] = $plugin_id;
      unset($active_modules[$idx]);
    }
  }
  $config->set('active_plugins', $active_plugins);
  if ($active_modules) {
    update_variable_set('search_active_modules', $active_modules);
  }
  else {
    update_variable_del('search_active_modules');
  }
  $default_module = update_variable_get('search_default_module', 'node');
  if (isset($map[$default_module])) {
    $config->set('default_plugin', $map[$default_module]);
    update_variable_del('search_default_module');
  }
  $config->save();
}

/**
 * Adds the langcode field and indexes to {search_dataset} and {search_index}.
 */
function search_update_8001() {
  // In order to upgrade the existing entries to have the correct langcode we
  // need to recreate search data through running cron.
  db_truncate('search_dataset');
  db_truncate('search_index');
  // This table is no longer used.
  db_drop_table('search_node_links');

  // Add the fields and indexes.
  db_drop_primary_key('search_dataset');
  db_add_field('search_dataset', 'langcode', array(
    'type' => 'varchar',
    'length' => '12',
    'not null' => TRUE,
    'description' => 'The {languages}.langcode of the item variant.',
    'default' => '',
  ));
  db_add_primary_key('search_dataset', array('sid', 'langcode', 'type'));

  db_drop_primary_key('search_index');
  db_drop_index('search_index', 'sid_type');
  db_add_field('search_index', 'langcode', array(
    'type' => 'varchar',
    'length' => '12',
    'not null' => TRUE,
    'description' => 'The {languages}.langcode of the item variant.',
    'default' => '',
  ),
  array(
    'indexes' => array(
      'sid_type' => array('sid', 'langcode', 'type'),
    ),
  ));
  db_add_primary_key('search_index', array('word', 'sid', 'langcode', 'type'));
}