<?php
// $Id$

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

/**
 * Implements hook_schema().
 */
function filter_schema() {
  $schema['filter'] = array(
    'description' => 'Table that maps filters (HTML corrector) to text formats (Filtered HTML).',
    'fields' => array(
      '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.',
      ),
      'name' => array(
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
        'default' => '',
        'description' => 'Name of the filter being referenced.',
      ),
      'weight' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'tiny',
        'description' => 'Weight of filter within format.',
      ),
      'status' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Filter enabled status. (1 = enabled, 0 = disabled)',
      ),
      'settings' => array(
        'type' => 'text',
        'not null' => FALSE,
        'size' => 'big',
        'serialize' => TRUE,
        'description' => 'A serialized array of name value pairs that store the filter settings for the specific format.',
      ),
    ),
    'primary key' => array('format', 'name'),
    'unique keys' => array(
      'fmn' => array('format', 'module', 'name'),
    ),
    'indexes' => array(
      'list' => array('weight', 'module', 'name'),
    ),
  );
  $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).',
        'translatable' => TRUE,
      ),
      'cache' => array(
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'tiny',
        'description' => 'Flag to indicate whether format is cacheable. (1 = cacheable, 0 = not cacheable)',
      ),
      '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'),
    ),
    'indexes' => array(
      'weight' => array('weight'),
    ),
  );

  $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;
}

/**
 * @defgroup updates-6.x-to-7.x Filter updates from 6.x to 7.x
 * @{
 */

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

/**
 * Break out "escape HTML filter" option to its own filter.
 */
function filter_update_7001() {
  $result = db_query("SELECT format FROM {filter_formats}")->fetchCol();
  $insert = db_insert('filters')->fields(array('format', 'module', 'delta', 'weight'));

  foreach ($result as $format_id) {
    // Deprecated constants FILTER_HTML_STRIP = 1 and FILTER_HTML_ESCAPE = 2.
    if (variable_get('filter_html_' . $format_id, 1) == 2) {
      $insert->values(array(
        'format' => $format_id,
        'filter' => 'filter',
        'delta' => 4,
        'weight' => 0,
      ));
    }
    variable_del('filter_html_' . $format_id);
  }

  $insert->execute();
}

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

/**
 * Remove hardcoded numeric deltas from all filters in core.
 */
function filter_update_7003() {
  // Get an array of the renamed filter deltas, organized by module.
  $renamed_deltas = array(
    'filter' => array(
      '0' => 'filter_html',
      '1' => 'filter_autop',
      '2' => 'filter_url',
      '3' => 'filter_htmlcorrector',
      '4' => 'filter_html_escape',
    ),
    'php' => array(
      '0' => 'php_code',
    ),
  );

  // Rename field 'delta' to 'name'.
  db_drop_unique_key('filter', 'fmd');
  db_drop_index('filter', 'list');
  db_change_field('filter', 'delta', 'name',
    array(
      'type' => 'varchar',
      'length' => 32,
      'not null' => TRUE,
      'default' => '',
      'description' => 'Name of the filter being referenced.',
    ),
    array(
      'unique keys' => array(
        'fmn' => array('format', 'module', 'name'),
      ),
      'indexes' => array(
        'list' => array('format', 'weight', 'module', 'name'),
      ),
    )
  );

  // Loop through each filter and make changes to the core filter table.
  foreach ($renamed_deltas as $module => $deltas) {
    foreach ($deltas as $old_delta => $new_delta) {
      db_update('filter')
        ->fields(array('name' => $new_delta))
        ->condition('module', $module)
        ->condition('name', $old_delta)
        ->execute();
    }
  }
}

/**
 * Move filter settings storage into {filter} table.
 *
 * - Remove {filter}.fid.
 * - Add (format, name) as primary key for {filter}.
 * - Add {filter}.status.
 * - Add {filter}.settings.
 */
function filter_update_7004() {
  db_drop_field('filter', 'fid');
  db_add_primary_key('filter', array('format', 'name'));
  db_add_field('filter', 'status',
    array(
      'type' => 'int',
      'not null' => TRUE,
      'default' => 0,
      'description' => 'Filter enabled status. (1 = enabled, 0 = disabled)',
    )
  );
  db_add_field('filter', 'settings',
    array(
      'type' => 'text',
      'not null' => FALSE,
      'size' => 'big',
      'serialize' => TRUE,
      'description' => 'A serialized array of name value pairs that store the filter settings for the specific format.',
    )
  );

  // Enable all existing filters ({filter} contained only enabled previously).
  db_update('filter')
    ->fields(array('status' => '1'))
    ->execute();

  // Move filter settings from system variables into {filter}.settings.
  $filters = db_query("SELECT * FROM {filter} WHERE module = :name", array(':name' => 'filter'));
  foreach ($filters as $filter) {
    $settings = array();
    if ($filter->name == 'filter_html') {
      if ($setting = variable_get("allowed_html_{$filter->format}", NULL)) {
        $settings['allowed_html'] = $setting;
        variable_del("allowed_html_{$filter->format}");
      }
      if ($setting = variable_get("filter_html_help_{$filter->format}", NULL)) {
        $settings['filter_html_help'] = $setting;
        variable_del("filter_html_help_{$filter->format}");
      }
      if ($setting = variable_get("filter_html_nofollow_{$filter->format}", NULL)) {
        $settings['filter_html_nofollow'] = $setting;
        variable_del("filter_html_nofollow_{$filter->format}");
      }
    }
    elseif ($filter->name == 'filter_url') {
      if ($setting = variable_get("filter_url_length_{$filter->format}", NULL)) {
        $settings['filter_url_length'] = $setting;
        variable_del("filter_url_length_{$filter->format}");
      }
    }
    if (!empty($settings)) {
      db_update('filter')
        ->fields(array('settings' => serialize($settings)))
        ->condition('format', $filter->format)
        ->condition('name', $filter->name)
        ->execute();
    }
  }
}

/**
 * Integrate text formats with the user permissions system.
 *
 * This function converts text format role assignments to use the new text
 * format permissions introduced in Drupal 7, creates a fallback (plain text)
 * format that is available to all users, and explicitly sets the text format
 * in cases that used to rely on a single site-wide default.
 */
function filter_update_7005() {

  // Move role data from the filter system to the user permission system.
  $all_roles = array_keys(user_roles());
  $default_format = variable_get('filter_default_format', 1);
  $result = db_query("SELECT * FROM {filter_format}");
  foreach ($result as $format) {
    // We need to assign the default format to all roles (regardless of what
    // was stored in the database) to preserve the behavior of the site at the
    // moment of the upgrade.
    $format_roles = ($format->format == $default_format ? $all_roles : explode(',', $format->roles));
    foreach ($format_roles as $format_role) {
      if (in_array($format_role, $all_roles)) {
        user_role_grant_permissions($format_role, array(filter_permission_name($format)));
      }
    }
  }

  // Drop the roles field from the {filter_format} table.
  db_drop_field('filter_format', 'roles');

  // Add a fallback text format which outputs plain text and appears last on
  // the list for all users. Generate a unique name for it, starting with
  // "Plain text".
  $start_name = 'Plain text';
  $format_name = $start_name;
  while ($format = db_query('SELECT format FROM {filter_format} WHERE name = :name', array(':name' => $format_name))->fetchField()) {
    $id = empty($id) ? 1 : $id + 1;
    $format_name = $start_name . ' ' . $id;
  }
  $fallback_format = new stdClass();
  $fallback_format->name = $format_name;
  $fallback_format->cache = 1;
  $fallback_format->weight = 1;
  // This format should output plain text, so we escape all HTML and apply the
  // line break filter only.
  $fallback_format->filters = array(
    'filter_html_escape' => array('status' => 1),
    'filter_autop' => array('status' => 1),
  );
  filter_format_save($fallback_format);
  variable_set('filter_fallback_format', $fallback_format->format);
  drupal_set_message('A new <em>Plain text</em> format has been created which will be available to all users. You can configure this text format on the <a href="' . url('admin/config/content/formats/' . $fallback_format->format) . '">text format configuration page</a>.');

  // Move the former site-wide default text format to the top of the list, so
  // that it continues to be the default text format for all users.
  db_update('filter_format')
    ->fields(array('weight' => -1))
    ->condition('format', $default_format)
    ->execute();

  // It was previously possible for a value of "0" to be stored in database
  // tables to indicate that a particular piece of text should be filtered
  // using the default text format. Therefore, we have to convert all such
  // instances (in Drupal core) to explicitly use the appropriate format.
  // Note that the update of the node body field is handled separately, in
  // node_update_7006().
  foreach (array('block_custom', 'comment') as $table) {
    if (db_table_exists($table)) {
      db_update($table)
        ->fields(array('format' => $default_format))
        ->condition('format', 0)
        ->execute();
    }
  }

  // We do not delete the 'filter_default_format' variable, since other modules
  // may need it in their update functions.
  // @todo This variable can be deleted in Drupal 8.
}

/**
 * Remove the 'format' column from 'list' index on {filter}.
 */
function filter_update_7006() {
  db_drop_index('filter', 'list');
  db_add_index('filter', 'list', array('weight', 'module', 'name'));
}

/**
 * @} End of "defgroup updates-6.x-to-7.x"
 * The next series of updates should start at 8000.
 */