<?php
// $Id$

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

/**
 * Implementation of hook_schema().
 */
function filter_schema() {
  $schema['filter'] = array(
    'description' => 'Table that maps filters (HTML corrector) to text formats (Filtered HTML).',
    'fields' => array(
      'fid' => array(
        'type' => 'serial',
        'not null' => TRUE,
        'description' => 'Primary Key: Auto-incrementing filter ID.',
      ),
      'format' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Foreign key: The {filter_format}.format to which this filter is assigned.',
      ),
      'module' => array(
        'type' => 'varchar',
        'length' => 64,
        'not null' => TRUE,
        'default' => '',
        'description' => 'The origin module of the filter.',
      ),
      'delta' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'tiny',
        'description' => 'ID to identify which filter within module is being referenced.',
      ),
      'weight' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'tiny',
        'description' => 'Weight of filter within format.',
      )
    ),
    'primary key' => array('fid'),
    'unique keys' => array(
      'fmd' => array('format', 'module', 'delta'),
    ),
    'indexes' => array(
      'list' => array('format', 'weight', 'module', 'delta'),
    ),
  );
  $schema['filter_format'] = array(
    'description' => 'Stores text formats: custom groupings of filters, such as Filtered HTML.',
    'fields' => array(
      'format' => array(
        'type' => 'serial',
        'not null' => TRUE,
        'description' => 'Primary Key: Unique ID for format.',
      ),
      'name' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Name of the text format (Filtered HTML).',
      ),
      'roles' => array(
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
        'description' => 'A comma-separated string of roles; references {role}.rid.', // This is bad since you can't use joins, nor index.
      ),
      'cache' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'tiny',
        'description' => 'Flag to indicate whether format is cachable. (1 = cachable, 0 = not cachable)',
      ),
      'weight' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'tiny',
        'description' => 'Weight of text format to use when listing.',
      )
    ),
    'primary key' => array('format'),
    'unique keys' => array(
      'name' => array('name'),
    ),
  );

  $schema['cache_filter'] = drupal_get_schema_unprocessed('system', 'cache');
  $schema['cache_filter']['description'] = 'Cache table for the Filter module to store already filtered pieces of text, identified by text format and md5 hash of the text.';

  return $schema;
}

/**
 * Add a weight column to the filter formats table.
 */
function filter_update_7000() {
  $ret = array();
  db_add_field($ret, 'filter_formats', 'weight', array('type' => 'int', 'not null' => TRUE, 'default' => 0, 'size' => 'tiny'));
  return $ret;
}

/**
 * Break out "escape HTML filter" option to its own filter.
 */
function filter_update_7001() {
  $ret = array();
  $result = db_query("SELECT format FROM {filter_formats}");
  foreach ($result as $format) {
    // Deprecated constants FILTER_HTML_STRIP = 1 and FILTER_HTML_ESCAPE = 2.
    if (variable_get('filter_html_' . $format->format, 1) == 2) {
      $ret[] = update_sql("INSERT INTO {filters} (format, module, delta, weight) VALUES (" . $format->format . ", 'filter', 4, 0)");
    }
    variable_del('filter_html_' . $format->format);
  }
  return $ret;
}

/**
 * Rename {filters} table to {filter} and {filter_formats} table to {filter_format}.
 */
function filter_update_7002() {
  $ret = array();
  db_rename_table($ret, 'filters', 'filter');
  db_rename_table($ret, 'filter_formats', 'filter_format');
  return $ret;
}