<?php
// $Id$

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

/**
 * Implement hook_schema().
 */
function node_schema() {
  $schema['node'] = array(
    'description' => 'The base table for nodes.',
    'fields' => array(
      'nid' => array(
        'description' => 'The primary identifier for a node.',
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE,
      ),
      'vid' => array(
        'description' => 'The current {node_revision}.vid version identifier.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
      ),
      'type' => array(
        'description' => 'The {node_type}.type of this node.',
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
        'default' => '',
      ),
      'language' => array(
        'description' => 'The {languages}.language of this node.',
        'type' => 'varchar',
        'length' => 12,
        'not null' => TRUE,
        'default' => '',
      ),
      'title' => array(
        'description' => 'The title of this node, always treated as non-markup plain text.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
      ),
      'uid' => array(
        'description' => 'The {users}.uid that owns this node; initially, this is the user that created it.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'status' => array(
        'description' => 'Boolean indicating whether the node is published (visible to non-administrators).',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 1,
      ),
      'created' => array(
        'description' => 'The Unix timestamp when the node was created.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'changed' => array(
        'description' => 'The Unix timestamp when the node was most recently saved.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'comment' => array(
        'description' => 'Whether comments are allowed on this node: 0 = no, 1 = closed (read only), 2 = open (read/write).',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'promote' => array(
        'description' => 'Boolean indicating whether the node should be displayed on the front page.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'moderate' => array(
        'description' => 'Previously, a boolean indicating whether the node was "in moderation"; mostly no longer used.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'sticky' => array(
        'description' => 'Boolean indicating whether the node should be displayed at the top of lists in which it appears.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'tnid' => array(
        'description' => 'The translation set id for this node, which equals the node id of the source post in each set.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
      ),
      'translate' => array(
        'description' => 'A boolean indicating whether this translation page needs to be updated.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
    ),
    'indexes' => array(
      'node_changed'        => array('changed'),
      'node_created'        => array('created'),
      'node_moderate'       => array('moderate'),
      'node_frontpage'      => array('promote', 'status', 'sticky', 'created'),
      'node_status_type'    => array('status', 'type', 'nid'),
      'node_title_type'     => array('title', array('type', 4)),
      'node_type'           => array(array('type', 4)),
      'uid'                 => array('uid'),
      'tnid'                => array('tnid'),
      'translate'           => array('translate'),
    ),
    'unique keys' => array(
      'vid' => array('vid'),
    ),
    'foreign keys' => array(
      'vid' => array('node_revision' => 'vid'),
      'uid' => array('users' => 'uid'),
    ),
    'primary key' => array('nid'),
  );

  $schema['node_access'] = array(
    'description' => 'Identifies which realm/grant pairs a user must possess in order to view, update, or delete specific nodes.',
    'fields' => array(
      'nid' => array(
        'description' => 'The {node}.nid this record affects.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
      ),
      'gid' => array(
        'description' => "The grant ID a user must possess in the specified realm to gain this row's privileges on the node.",
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
      ),
      'realm' => array(
        'description' => 'The realm in which the user must possess the grant ID. Each node access node can define one or more realms.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
      ),
      'grant_view' => array(
        'description' => 'Boolean indicating whether a user with the realm/grant pair can view this node.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'size' => 'tiny',
      ),
      'grant_update' => array(
        'description' => 'Boolean indicating whether a user with the realm/grant pair can edit this node.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'size' => 'tiny',
      ),
      'grant_delete' => array(
        'description' => 'Boolean indicating whether a user with the realm/grant pair can delete this node.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
        'size' => 'tiny',
      ),
    ),
    'primary key' => array('nid', 'gid', 'realm'),
    'foreign keys' => array('node' => 'nid'),
  );

  $schema['node_revision'] = array(
    'description' => 'Stores information about each saved version of a {node}.',
    'fields' => array(
      'nid' => array(
        'description' => 'The {node} this version belongs to.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'default' => 0,
      ),
      'vid' => array(
        'description' => 'The primary identifier for this version.',
        'type' => 'serial',
        'unsigned' => TRUE,
        'not null' => TRUE,
      ),
      'uid' => array(
        'description' => 'The {users}.uid that created this version.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'title' => array(
        'description' => 'The title of this version.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
      ),
      'log' => array(
        'description' => 'The log entry explaining the changes in this version.',
        'type' => 'text',
        'not null' => TRUE,
        'size' => 'big',
      ),
      'timestamp' => array(
        'description' => 'A Unix timestamp indicating when this version was created.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'status' => array(
        'description' => 'Boolean indicating whether the node (at the time of this revision) is published (visible to non-administrators).',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 1,
      ),
      'comment' => array(
        'description' => 'Whether comments are allowed on this node (at the time of this revision): 0 = no, 1 = closed (read only), 2 = open (read/write).',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'promote' => array(
        'description' => 'Boolean indicating whether the node (at the time of this revision) should be displayed on the front page.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'moderate' => array(
        'description' => 'Previously, a boolean indicating whether the node (at the time of this revision) was "in moderation"; mostly no longer used.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
      'sticky' => array(
        'description' => 'Boolean indicating whether the node (at the time of this revision) should be displayed at the top of lists in which it appears.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
      ),
    ),
    'indexes' => array(
      'nid' => array('nid'),
      'uid' => array('uid'),
    ),
    'primary key' => array('vid'),
    'foreign keys' => array(
      'node' => 'nid',
      'users' => 'uid'
    ),
  );

  $schema['node_type'] = array(
    'description' => 'Stores information about all defined {node} types.',
    'fields' => array(
      'type' => array(
        'description' => 'The machine-readable name of this type.',
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
      ),
      'name' => array(
        'description' => 'The human-readable name of this type.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
      ),
      'base' => array(
        'description' => 'The base string used to construct callbacks corresponding to this node type.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
      ),
      'description' => array(
        'description' => 'A brief description of this type.',
        'type' => 'text',
        'not null' => TRUE,
        'size' => 'medium',
      ),
      'help' => array(
        'description' => 'Help information shown to the user when creating a {node} of this type.',
        'type' => 'text',
        'not null' => TRUE,
        'size' => 'medium',
      ),
      'has_title' => array(
        'description' => 'Boolean indicating whether this type uses the {node}.title field.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'size' => 'tiny',
      ),
      'title_label' => array(
        'description' => 'The label displayed for the title field on the edit form.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
      ),
      'has_body' => array(
        'description' => 'Boolean indicating whether this type has the body field attached.',
        'type' => 'int',
        'unsigned' => TRUE,
        'not null' => TRUE,
        'size' => 'tiny',
      ),
      'body_label' => array(
        'description' => 'The label displayed for the body field on the edit form.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
      ),
      'custom' => array(
        'description' => 'A boolean indicating whether this type is defined by a module (FALSE) or by a user via Add content type (TRUE).',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'tiny',
      ),
      'modified' => array(
        'description' => 'A boolean indicating whether this type has been modified by an administrator; currently not used in any way.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'tiny',
      ),
      'locked' => array(
        'description' => 'A boolean indicating whether the administrator can change the machine name of this type.',
        'type' => 'int',
        'not null' => TRUE,
        'default' => 0,
        'size' => 'tiny',
      ),
      'orig_type' => array(
        'description' => 'The original machine-readable name of this node type. This may be different from the current type name if the locked field is 0.',
        'type' => 'varchar',
        'length' => 255,
        'not null' => TRUE,
        'default' => '',
      ),
    ),
    'primary key' => array('type'),
  );

  return $schema;
}

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

/**
 * Fix node type 'module' attribute to avoid name-space conflicts.
 */
function node_update_7000() {
  $ret = array();

  $ret[] = update_sql("UPDATE {node_type} SET module = 'node_content' WHERE module = 'node'");
  db_change_field($ret, 'node_type', 'module', 'base', array('type' => 'varchar', 'length' => 255, 'not null' => TRUE));

  return $ret;
}

/**
 * Rename {node_revisions} table to {node_revision}.
 */
function node_update_7001() {
  $ret = array();
  db_rename_table($ret, 'node_revisions', 'node_revision');
  return $ret;
}

/**
 * Extend the node_promote_status index to include all fields required for the node page query.
 */
function node_update_7002() {
  $ret = array();
  db_drop_index($ret, 'node', 'node_promote_status');
  db_add_index($ret, 'node', 'node_frontpage', array('promote', 'status', 'sticky', 'created'));
  return $ret;
}

/**
 * Remove the node_counter if the statistics module is uninstalled.
 */
function node_update_7003() {
  $ret = array();
  if (drupal_get_installed_schema_version('statistics') == SCHEMA_UNINSTALLED) {
    db_drop_table($ret, 'node_counter');
  }
  return $ret;
}

/**
 * Extend the existing default preview and teaser settings to all node types.
 */
function node_update_7004() {
  // Get original settings and all types.
  $original_length = variable_get('teaser_length', 600);
  $original_preview = variable_get('node_preview', 0);

  // Map old preview setting to new values order.
  $original_preview ? $original_preview = 2 : $original_preview = 1;
  node_type_clear();
  $type_list = node_type_get_types();

  // Apply original settings to all types.
  foreach ($type_list as $type => $object) {
    variable_set('teaser_length_' . $type, $original_length);
    variable_set('node_preview_' . $type, $original_preview);
  }
  // Delete old variable but leave 'teaser_length' for aggregator module upgrade.
  variable_del('node_preview');

  return array();
}

/**
 * Add status/comment/promote/moderate and sticky columns to the {node_revision} table.
 */
function node_update_7005() {
  $ret = array();
  foreach(array('status', 'comment', 'promote', 'moderate', 'sticky') as $column) {
    db_add_field($ret, 'node_revision', $column, array(
      'type' => 'int',
      'not null' => TRUE,
      'default' => 0,
    ));
  }
  return $ret;
}

/**
 * Convert body and teaser from node properties to fields, and migrate status/comment/promote/moderate and sticky columns to the {node_revision} table.
 */
function node_update_7006(&$context) {
  $ret = array('#finished' => 0);

  // Get node type info for every invocation.
  node_type_clear();
  $node_types = node_type_get_types();

  if (!isset($context['total'])) {
    // Initial invocation.

    // Re-save node types to create body field instances.
    foreach ($node_types as $type => $info) {
      if ($info->has_body) {
        node_type_save($info);
      }
    }

    // Initialize state for future calls.
    $context['last'] = 0;
    $context['count'] = 0;

    $query = db_select('node', 'n');
    $query->join('node_revision', 'nr', 'n.vid = nr.vid');
    $context['total'] = $query->countQuery()->execute()->fetchField();
  }
  else {
    // Subsequent invocations.

    $found = FALSE;
    if ($context['total']) {
      // Operate on every revision of every node (whee!), in batches.
      $batch_size = 50;
      $query = db_select('node', 'n');
      $nr = $query->innerJoin('node_revision', 'nr', 'n.vid = nr.vid');
      $revisions = $query
        ->fields('n', array('type', 'status', 'comment', 'promote', 'moderate', 'sticky'))
        ->fields($nr)
        ->condition('nr.vid', $context['last'], '>')
        ->orderBy('nr.vid', 'ASC')
        ->execute();

      // Load each reversion of each node, set up 'body'
      // appropriately, and save the node's field data.  Note that
      // node_load() will not return the body or teaser values from
      // {node_revision} because those columns have been removed from the
      // schema structure in memory (but not yet from the database),
      // so we get the values from the explicit query of the table
      // instead.
      foreach ($revisions as $revision) {
        $found = TRUE;

        if ($node_types[$revision->type]->has_body) {
          $node = (object) array(
            'nid' => $revision->nid,
            'vid' => $revision->vid,
            'type' => $revision->type,
          );
          if (!empty($revision->teaser) && $revision->teaser != text_summary($revision->body)) {
            $node->body[0]['summary'] = $revision->teaser;
          }
          // Do this after text_summary() above.
          $break = '<!--break-->';
          if (substr($revision->body, 0, strlen($break)) == $break) {
            $revision->body = substr($revision->body, strlen($break));
          }
          $node->body[0]['value'] = $revision->body;
          $node->body[0]['format'] = $revision->format;
          // This is a core update and no contrib modules are enabled yet, so
          // we can assume default field storage for a faster update.
          field_sql_storage_field_storage_write('node', $node, FIELD_STORAGE_INSERT, array());
        }

        // Migrate the status columns to the {node_revision} table.
        db_update('node_revision')
          ->fields(array(
            'vid' => $revision->vid,
            'status' => $revision->status,
            'comment' => $revision->comment,
            'promote' => $revision->promote,
            'moderate' => $revision->moderate,
            'sticky' => $revision->sticky,
          ))
          ->condition('vid', $revision->vid)
          ->execute();

        $context['last'] = $revision->vid;
        $context['count'] += 1;

        if (--$batch_size == 0) {
          break;
        }
      }

      $ret['#finished'] = min(0.99, $context['count'] / $context['total']);
    }

    if (!$found) {
      // All nodes are processed.
      $ret[] = array('success' => TRUE, 'query' => "{$context['total']} node body and teaser properties migrated to the 'body' field.");

      // Remove the now-obsolete body info from node_revision.
      db_drop_field($ret, 'node_revision', 'body');
      db_drop_field($ret, 'node_revision', 'teaser');
      db_drop_field($ret, 'node_revision', 'format');

      // We're done.
      $ret['#finished'] = 1;
    }
  }

  return $ret;
}

/**
 * Remove column min_word_count.
 */
function node_update_7007() {
  $ret = array();
  db_drop_field($ret, 'node_type', 'min_word_count');
  return $ret;
}

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