<?php
// $Id$

/**
 * Implementation of hook_install().
 */
function search_install() {
  // Create tables.
  drupal_install_schema('search');
}

/**
 * Implementation of hook_uninstall().
 */
function search_uninstall() {
  // Remove tables.
  drupal_uninstall_schema('search');

  variable_del('minimum_word_size');
  variable_del('overlap_cjk');
  variable_del('search_cron_limit');
}

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

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

  $schema['search_total'] = array(
    'description' => t('Stores search totals for words.'),
    'fields' => array(
      'word' => array(
        'description' => t('Primary Key: Unique word in the search index.'),
        'type' => 'varchar',
        'length' => 50,
        'not null' => TRUE,
        'default' => '',
      ),
      'count' => array(
        'description' => t("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'),
  );

  $schema['search_node_links'] = array(
    'description' => t('Stores items (like nodes) that link to other nodes, used to improve search scores for nodes that are frequently linked to.'),
    'fields' => array(
      'sid' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => t('The {search_dataset}.sid of the searchable item containing the link to the node.'),
      ),
      'type' => array(
        'type' => 'varchar',
        'length' => 16,
        'not null' => TRUE,
        'default' => '',
        'description' => t('The {search_dataset}.type of the searchable item containing the link to the node.'),
      ),
      'nid' => array(
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'description' => t('The {node}.nid that this item links to.'),
      ),
      'caption' => array(
        'type' => 'text',
        'size' => 'big',
        'not null' => FALSE,
        'description' => t('The text used to link to the {node}.nid.'),
      ),
    ),
    'primary key' => array('sid', 'type', 'nid'),
    'indexes' => array(
      'nid' => array('nid'),
    ),
  );

  return $schema;
}
