<?php

/**

 * @file

 * Install, update and uninstall functions for the comment module.

 */

/**

 * Implements hook_uninstall().

 */

function comment_uninstall() {

  // Delete comment_body field.

  field_delete_field('comment_body');

  // Remove variables.

  variable_del('comment_block_count');

  $node_types = array_keys(node_type_get_types());

  foreach ($node_types as $node_type) {

    field_attach_delete_bundle('comment', 'comment_node_' . $node_type);

    variable_del('comment_' . $node_type);

    variable_del('comment_anonymous_' . $node_type);

    variable_del('comment_controls_' . $node_type);

    variable_del('comment_default_mode_' . $node_type);

    variable_del('comment_default_order_' . $node_type);

    variable_del('comment_default_per_page_' . $node_type);

    variable_del('comment_form_location_' . $node_type);

    variable_del('comment_preview_' . $node_type);

    variable_del('comment_subject_field_' . $node_type);

  }

}

/**

 * Implements hook_enable().

 */

function comment_enable() {

  // Insert records into the node_comment_statistics for nodes that are missing.

  $query = db_select('node', 'n');

  $query->leftJoin('node_comment_statistics', 'ncs', 'ncs.nid = n.nid');

  $query->addField('n', 'created', 'last_comment_timestamp');

  $query->addField('n', 'uid', 'last_comment_uid');

  $query->addField('n', 'nid');

  $query->addExpression('0', 'comment_count');

  $query->addExpression('NULL', 'last_comment_name');

  $query->isNull('ncs.comment_count');

  db_insert('node_comment_statistics')

    ->from($query)

    ->execute();

}

/**

 * Implements hook_modules_enabled().

 *

 * Creates comment body fields for node types existing before the comment module

 * is enabled. We use hook_modules_enabled() rather than hook_enable() so we can

 * react to node types of existing modules, and those of modules being enabled

 * both before and after comment module in the loop of module_enable().

 *

 * There is a separate comment bundle for each node type to allow for

 * per-node-type customization of comment fields. Each one of these bundles

 * needs a comment body field instance. A comment bundle is needed even for

 * node types whose comments are disabled by default, because individual nodes

 * may override that default.

 *

 * @see comment_node_type_insert()

 */

function comment_modules_enabled($modules) {

  // Only react if comment module is one of the modules being enabled.

  // hook_node_type_insert() is used to create body fields while the comment

  // module is enabled.

  if (in_array('comment', $modules)) {

    // Ensure that the list of node types reflects newly enabled modules.

    node_types_rebuild();

    // Create comment body fields for each node type, if needed.

    foreach (node_type_get_types() as $type => $info) {

      _comment_body_field_create($info);

    }

  }

}

/**

 * Implements hook_update_dependencies().

 */

function comment_update_dependencies() {

  // comment_update_7005() creates the comment body field and therefore must

  // run after all Field modules have been enabled, which happens in

  // system_update_7027().

  $dependencies['comment'][7005] = array(

    'system' => 7027,

  );

  // comment_update_7006() needs to query the {filter_format} table to get a

  // list of existing text formats, so it must run after filter_update_7000(),

  // which creates that table.

  $dependencies['comment'][7006] = array(

    'filter' => 7000,

  );

  return $dependencies;

}

/**

 * @addtogroup updates-6.x-to-7.x

 * @{

 */

/**

 * Rename comment display setting variables.

 */

function comment_update_7000() {

  $types = _update_7000_node_get_types();

  foreach ($types as $type => $type_object) {

    variable_del('comment_default_order' . $type);

    // Drupal 6 had four display modes:

    // - COMMENT_MODE_FLAT_COLLAPSED = 1

    // - COMMENT_MODE_FLAT_EXPANDED = 2

    // - COMMENT_MODE_THREADED_COLLAPSED = 3

    // - COMMENT_MODE_THREADED_EXPANDED = 4

    //

    // Drupal 7 doesn't support collapsed/expanded modes anymore, so we

    // migrate all the flat modes to COMMENT_MODE_FLAT (0) and all the threaded

    // modes to COMMENT_MODE_THREADED (1).

    $setting = variable_get('comment_default_mode_' . $type, 4);

    if ($setting == 3 || $setting == 4) {

      variable_set('comment_default_mode_' . $type, 1);

    }

    else {

      variable_set('comment_default_mode_' . $type, 0);

    }

    // There were only two comment modes in the past:

    // - 1 was 'required' previously, convert into DRUPAL_REQUIRED (2).

    // - 0 was 'optional' previously, convert into DRUPAL_OPTIONAL (1).

    $preview = variable_get('comment_preview_' . $type, 1) ? 2 : 1;

    variable_set('comment_preview_' . $type, $preview);

  }

}

/**

 * Change comment status from published being 0 to being 1

 */

function comment_update_7001() {

  // Choose a temporary status value different from the existing status values.

  $tmp_status = db_query('SELECT MAX(status) FROM {comments}')->fetchField() + 1;

  $changes = array(

    0 => $tmp_status,

    1 => 0,

    $tmp_status => 1,

  );

  foreach ($changes as $old => $new) {

    db_update('comments')

      ->fields(array('status' => $new))

      ->condition('status', $old)

      ->execute();

  }

}

/**

 * Rename {comments} table to {comment} and upgrade it.

 */

function comment_update_7002() {

  db_rename_table('comments', 'comment');

  // Add user-related indexes. These may already exist from Drupal 6.

  if (!db_index_exists('comment', 'comment_uid')) {

    db_add_index('comment', 'comment_uid', array('uid'));

    db_add_index('node_comment_statistics', 'last_comment_uid', array('last_comment_uid'));

  }

  // Create a language column.

  db_add_field('comment', 'language', array(

    'type' => 'varchar',

    'length' => 12,

    'not null' => TRUE,

    'default' => '',

  ));

  db_add_index('comment', 'comment_nid_language', array('nid', 'language'));

}

/**

 * Split {comment}.timestamp into 'created' and 'changed', improve indexing on {comment}.

 */

function comment_update_7003() {

  // Drop the old indexes.

  db_drop_index('comment', 'status');

  db_drop_index('comment', 'pid');

  // Create a created column.

  db_add_field('comment', 'created', array(

    'type' => 'int',

    'not null' => TRUE,

    'default' => 0,

  ));

  // Rename the timestamp column to changed.

  db_change_field('comment', 'timestamp', 'changed', array(

    'type' => 'int',

    'not null' => TRUE,

    'default' => 0,

  ));

  // Migrate the data.

  // @todo db_update() should support this.

  db_query('UPDATE {comment} SET created = changed');

  // Recreate the indexes.

  // The 'comment_num_new' index is optimized for comment_num_new()

  // and comment_new_page_count().

  db_add_index('comment', 'comment_num_new', array('nid', 'status', 'created', 'cid', 'thread'));

  db_add_index('comment', 'comment_pid_status', array('pid', 'status'));

}

/**

 * Upgrade the {node_comment_statistics} table.

 */

function comment_update_7004() {

  db_add_field('node_comment_statistics', 'cid', array(

    'type' => 'int',

    'not null' => TRUE,

    'default' => 0,

    'description' => 'The {comment}.cid of the last comment.',

  ));

  db_add_index('node_comment_statistics', 'cid', array('cid'));

  // The comment_count index may have been added in Drupal 6.

  if (!db_index_exists('node_comment_statistics', 'comment_count')) {

    // Add an index on the comment_count.

    db_add_index('node_comment_statistics', 'comment_count', array('comment_count'));

  }

}

/**

 * Create the comment_body field.

 */

function comment_update_7005() {

  // Create comment body field.

  $field = array(

    'field_name' => 'comment_body',

    'type' => 'text_long',

    'module' => 'text',

    'entity_types' => array(

      'comment',

    ),

    'settings' => array(),

    'cardinality' => 1,

  );

  _update_7000_field_create_field($field);

  // Add the field to comments for all existing bundles.

  $generic_instance = array(

    'entity_type' => 'comment',

    'label' => t('Comment'),

    'settings' => array(

      'text_processing' => 1,

    ),

    'required' => TRUE,

    'display' => array(

      'default' => array(

        'label' => 'hidden',

        'type' => 'text_default',

        'weight' => 0,

        'settings' => array(),

        'module' => 'text',

      ),

    ),

    'widget' => array(

      'type' => 'text_textarea',

      'settings' => array(

        'rows' => 5,

      ),

      'weight' => 0,

      'module' => 'text',

    ),

    'description' => '',

  );

  $types = _update_7000_node_get_types();

  foreach ($types as $type => $type_object) {

    $instance = $generic_instance;

    $instance['bundle'] = 'comment_node_' . $type;

    _update_7000_field_create_instance($field, $instance);

  }

}

/**

 * Migrate data from the comment field to field storage.

 */

function comment_update_7006(&$sandbox) {

  // This is a multipass update. First set up some comment variables.

  if (empty($sandbox['total'])) {

    $comments = (bool) db_query_range('SELECT 1 FROM {comment}', 0, 1)->fetchField();

    $sandbox['types'] = array();

    if ($comments) {

      $sandbox['types'] = array_keys(_update_7000_node_get_types());

    }

    $sandbox['total'] = count($sandbox['types']);

  }

  if (!empty($sandbox['types'])) {

    $type = array_shift($sandbox['types']);

    $query = db_select('comment', 'c');

    $query->innerJoin('node', 'n', 'c.nid = n.nid AND n.type = :type', array(':type' => $type));

    $query->addField('c', 'cid', 'entity_id');

    $query->addExpression("'comment_node_$type'", 'bundle');

    $query->addExpression("'comment'", 'entity_type');

    $query->addExpression('0', 'deleted');

    $query->addExpression("'" . LANGUAGE_NONE . "'", 'language');

    $query->addExpression('0', 'delta');

    $query->addField('c', 'comment', 'comment_body_value');

    $query->addField('c', 'format', 'comment_body_format');

    db_insert('field_data_comment_body')

      ->from($query)

      ->execute();

    $sandbox['#finished'] = 1 - count($sandbox['types']) / $sandbox['total'];

  }

  // On the last pass of the update, $sandbox['types'] will be empty.

  if (empty($sandbox['types'])) {

    // Update the comment body text formats. For an explanation of these

    // updates, see the code comments in user_update_7010().

    db_update('field_data_comment_body')

      ->fields(array('comment_body_format' => NULL))

      ->condition('comment_body_value', '')

      ->condition('comment_body_format', 0)

      ->execute();

    $existing_formats = db_query("SELECT format FROM {filter_format}")->fetchCol();

    $default_format = variable_get('filter_default_format', 1);

    db_update('field_data_comment_body')

      ->fields(array('comment_body_format' => $default_format))

      ->isNotNull('comment_body_format')

      ->condition('comment_body_format', $existing_formats, 'NOT IN')

      ->execute();

    // Finally, remove the old comment data.

    db_drop_field('comment', 'comment');

    db_drop_field('comment', 'format');

  }

}

/**

 * @} End of "addtogroup updates-6.x-to-7.x".

 */

/**

 * @addtogroup updates-7.x-extra

 * @{

 */

/**

 * Add an index to the created column.

 */

function comment_update_7007() {

  db_add_index('comment', 'comment_created', array('created'));

}

/**

 * Update database to match Drupal 7 schema.

 */

function comment_update_7008() {

  // Update default status to 1.

  db_change_field('comment', 'status', 'status', array(

    'type' => 'int',

    'unsigned' => TRUE,

    'not null' => TRUE,

    'default' => 1,

    'size' => 'tiny',

  ));

  // Realign indexes.

  db_drop_index('comment', 'comment_status_pid');

  db_add_index('comment', 'comment_status_pid', array('pid', 'status'));

  db_drop_index('comment', 'comment_pid_status');

  db_drop_index('comment', 'nid');

}

/**

 * Change the last_comment_timestamp column description.

 */

function comment_update_7009() {

  db_change_field('node_comment_statistics', 'last_comment_timestamp', 'last_comment_timestamp', array(

    'type' => 'int',

    'not null' => TRUE,

    'default' => 0,

    'description' => 'The Unix timestamp of the last comment that was posted within this node, from {comment}.changed.',

  ));

}

/**

 * @} End of "addtogroup updates-7.x-extra".

 */

/**

 * Implements hook_schema().

 */

function comment_schema() {

  $schema['comment'] = array(

    'description' => 'Stores comments and associated data.',

    'fields' => array(

      'cid' => array(

        'type' => 'serial',

        'not null' => TRUE,

        'description' => 'Primary Key: Unique comment ID.',

      ),

      'pid' => array(

        'type' => 'int',

        'not null' => TRUE,

        'default' => 0,

        'description' => 'The {comment}.cid to which this comment is a reply. If set to 0, this comment is not a reply to an existing comment.',

      ),

      'nid' => array(

        'type' => 'int',

        'not null' => TRUE,

        'default' => 0,

        'description' => 'The {node}.nid to which this comment is a reply.',

      ),

      'uid' => array(

        'type' => 'int',

        'not null' => TRUE,

        'default' => 0,

        'description' => 'The {users}.uid who authored the comment. If set to 0, this comment was created by an anonymous user.',

      ),

      'subject' => array(

        'type' => 'varchar',

        'length' => 64,

        'not null' => TRUE,

        'default' => '',

        'description' => 'The comment title.',

      ),

      'hostname' => array(

        'type' => 'varchar',

        'length' => 128,

        'not null' => TRUE,

        'default' => '',

        'description' => "The author's host name.",

      ),

      'created' => array(

        'type' => 'int',

        'not null' => TRUE,

        'default' => 0,

        'description' => 'The time that the comment was created, as a Unix timestamp.',

      ),

      'changed' => array(

        'type' => 'int',

        'not null' => TRUE,

        'default' => 0,

        'description' => 'The time that the comment was last edited, as a Unix timestamp.',

      ),

      'status' => array(

        'type' => 'int',

        'unsigned' => TRUE,

        'not null' => TRUE,

        'default' => 1,

        'size' => 'tiny',

        'description' => 'The published status of a comment. (0 = Not Published, 1 = Published)',

      ),

      'thread' => array(

        'type' => 'varchar',

        'length' => 255,

        'not null' => TRUE,

        'description' => "The vancode representation of the comment's place in a thread.",

      ),

      'name' => array(

        'type' => 'varchar',

        'length' => 60,

        'not null' => FALSE,

        'description' => "The comment author's name. Uses {users}.name if the user is logged in, otherwise uses the value typed into the comment form.",

      ),

      'mail' => array(

        'type' => 'varchar',

        'length' => 64,

        'not null' => FALSE,

        'description' => "The comment author's e-mail address from the comment form, if user is anonymous, and the 'Anonymous users may/must leave their contact information' setting is turned on.",

      ),

      'homepage' => array(

        'type' => 'varchar',

        'length' => 255,

        'not null' => FALSE,

        'description' => "The comment author's home page address from the comment form, if user is anonymous, and the 'Anonymous users may/must leave their contact information' setting is turned on.",

      ),

      'language' => array(

        'description' => 'The {languages}.language of this comment.',

        'type' => 'varchar',

        'length' => 12,

        'not null' => TRUE,

        'default' => '',

      ),

    ),

    'indexes' => array(

      'comment_status_pid' => array('pid', 'status'),

      'comment_num_new' => array('nid', 'status', 'created', 'cid', 'thread'),

      'comment_uid' => array('uid'),

      'comment_nid_language' => array('nid', 'language'),

      'comment_created' => array('created'),

    ),

    'primary key' => array('cid'),

    'foreign keys' => array(

      'comment_node' => array(

        'table' => 'node',

        'columns' => array('nid' => 'nid'),

      ),

      'comment_author' => array(

        'table' => 'users',

        'columns' => array('uid' => 'uid'),

      ),

    ),

  );

  $schema['node_comment_statistics'] = array(

    'description' => 'Maintains statistics of node and comments posts to show "new" and "updated" flags.',

    'fields' => array(

      'nid' => array(

        'type' => 'int',

        'unsigned' => TRUE,

        'not null' => TRUE,

        'default' => 0,

        'description' => 'The {node}.nid for which the statistics are compiled.',

      ),

      'cid' => array(

        'type' => 'int',

        'not null' => TRUE,

        'default' => 0,

        'description' => 'The {comment}.cid of the last comment.',