<?php

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

/**
 * Implements hook_schema().
 */
function field_schema() {
  // Static (meta) tables.
  $schema['field_config'] = array(
    'fields' => array(
      'id' => array(
        'type' => 'serial',
        'not null' => TRUE,
        'description' => 'The primary identifier for a field',
      ),
      'field_name' => array(
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
        'description' => 'The name of this field. Non-deleted field names are unique, but multiple deleted fields can have the same name.',
      ),
      'type' => array(
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
        'description' => 'The type of this field.',
      ),
     'module' => array(
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
        'default' => '',
        'description' => 'The module that implements the field type.',
      ),
      'active' => array(
        'type' => 'int',
        'size' => 'tiny',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Boolean indicating whether the module that implements the field type is enabled.',
      ),
      'storage_type' => array(
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
        'description' => 'The storage backend for the field.',
      ),
      'storage_module' => array(
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
        'default' => '',
        'description' => 'The module that implements the storage backend.',
      ),
      'storage_active' => array(
        'type' => 'int',
        'size' => 'tiny',
        'not null' => TRUE,
        'default' => 0,
        'description' => 'Boolean indicating whether the module that implements the storage backend is enabled.',
      ),
      'locked' => array(
        'type' => 'int',
        'size' => 'tiny',
        'not null' => TRUE,
        'default' => 0,
        'description' => '@TODO',
      ),
      'data' => array(
        'type' => 'blob',
        'size' => 'big',
        'not null' => TRUE,
        'serialize' => TRUE,
        'description' => 'Serialized data containing the field properties that do not warrant a dedicated column.',
      ),
      'cardinality' => array(
        'type' => 'int',
        'size' => 'tiny',
        'not null' => TRUE,
        'default' => 0,
      ),
      'translatable' => array(
        'type' => 'int',
        'size' => 'tiny',
        'not null' => TRUE,
        'default' => 0,
      ),
      'deleted' => array(
        'type' => 'int',
        'size' => 'tiny',
        'not null' => TRUE,
        'default' => 0,
      ),
    ),
    'primary key' => array('id'),
    'indexes' => array(
      'field_name' => array('field_name'),
      // Used by field_sync_field_status().
      'active' => array('active'),
      'storage_active' => array('storage_active'),
      'deleted' => array('deleted'),
      // Used by field_modules_disabled().
      'module' => array('module'),
      'storage_module' => array('storage_module'),
      'type' => array('type'),
      'storage_type' => array('storage_type'),
    ),
  );
  $schema['field_config_instance'] = array(
    'fields' => array(
      'id' => array(
        'type' => 'serial',
        'not null' => TRUE,
        'description' => 'The primary identifier for a field instance',
      ),
      'field_id' => array(
        'type' => 'int',
        'not null' => TRUE,
        'description' => 'The identifier of the field attached by this instance',
      ),
      'field_name' => array(
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
        'default' => ''
      ),
      'entity_type' => array(
        'type' => 'varchar',
        'length' => 32,
        'not null' => TRUE,
        'default' => ''
      ),
      'bundle' => array(
        'type' => 'varchar',
        'length' => 128,
        'not null' => TRUE,
        'default' => ''
      ),
      'data' => array(
        'type' => 'blob',
        'size' => 'big',
        'not null' => TRUE,
        'serialize' => TRUE,
      ),
      'deleted' => array(
        'type' => 'int',
        'size' => 'tiny',
        'not null' => TRUE,
        'default' => 0,
      ),
    ),
    'primary key' => array('id'),
    'indexes' => array(
      // Used by field_delete_instance().
      'field_name_bundle' => array('field_name', 'entity_type', 'bundle'),
      // Used by field_read_instances().
      'deleted' => array('deleted'),
    ),
  );
  $schema['cache_field'] = drupal_get_schema_unprocessed('system', 'cache');

  return $schema;
}

/**
 * Utility function: create a field by writing directly to the database.
 *
 * This function can be used for databases whose schema is at field module
 * version 7000 or higher.
 *
 * @ingroup update_api
 */
function _update_7000_field_create_field(&$field) {
  // Merge in default values.`
  $field += array(
    'entity_types' => array(),
    'cardinality' => 1,
    'translatable' => FALSE,
    'locked' => FALSE,
    'settings' => array(),
    'indexes' => array(),
    'deleted' => 0,
    'active' => 1,
  );

  // Set storage.
  $field['storage'] = array(
    'type' => 'field_sql_storage',
    'settings' => array(),
    'module' => 'field_sql_storage',
    'active' => 1,
  );

  // Fetch the field schema to initialize columns and indexes. The field module
  // is not guaranteed to be loaded at this point.
  module_load_install($field['module']);
  $schema = (array) module_invoke($field['module'], 'field_schema', $field);
  $schema += array('columns' => array(), 'indexes' => array());
  // 'columns' are hardcoded in the field type.
  $field['columns'] = $schema['columns'];
  // 'indexes' can be both hardcoded in the field type, and specified in the
  // incoming $field definition.
  $field['indexes'] += $schema['indexes'];

  // The serialized 'data' column contains everything from $field that does not
  // have its own column and is not automatically populated when the field is
  // read.
  $data = $field;
  unset($data['columns'], $data['field_name'], $data['type'], $data['active'], $data['module'], $data['storage_type'], $data['storage_active'], $data['storage_module'], $data['locked'], $data['cardinality'], $data['deleted']);
  // Additionally, do not save the 'bundles' property populated by
  // field_info_field().
  unset($data['bundles']);

  // Write the field to the database.
  $record = array(
    'field_name' => $field['field_name'],
    'type' => $field['type'],
    'module' => $field['module'],
    'active' => (int) $field['active'],
    'storage_type' => $field['storage']['type'],
    'storage_module' => $field['storage']['module'],
    'storage_active' => (int) $field['storage']['active'],
    'locked' => (int) $field['locked'],
    'data' => serialize($data),
    'cardinality' => $field['cardinality'],
    'translatable' => (int) $field['translatable'],
    'deleted' => (int) $field['deleted'],
  );
  // We don't use drupal_write_record() here because it depends on the schema.
  $field['id'] = db_insert('field_config')
    ->fields($record)
    ->execute();

  // Create storage for the field.
  field_sql_storage_field_storage_create_field($field);
}

/**
 * Utility function: delete a field stored in SQL storage directly from the database.
 *
 * To protect user data, this function can only be used to delete fields once
 * all information it stored is gone. Delete all data from the
 * field_data_$field_name table before calling by either manually issuing
 * delete queries against it or using _update_7000_field_delete_instance().
 *
 * This function can be used for databases whose schema is at field module
 * version 7000 or higher.
 *
 * @param $field_name
 *   The field name to delete.
 *
 * @ingroup update_api
 */
function _update_7000_field_delete_field($field_name) {
  $table_name = 'field_data_' . $field_name;
  if (db_select($table_name)->range(0, 1)->countQuery()->execute()->fetchField()) {
    $t = get_t();
    throw new Exception($t('This function can only be used to delete fields without data'));
  }
  // Delete all instances.
  db_delete('field_config_instance')
    ->condition('field_name', $field_name)
    ->execute();

  // Nuke field data and revision tables.
  db_drop_table($table_name);
  db_drop_table('field_revision_' . $field_name);

  // Delete the field.
  db_delete('field_config')
    ->condition('field_name', $field_name)
    ->execute();
}


/**
 * Utility function: delete an instance and all its data of a field stored in SQL Storage.
 *
 * BEWARE: this function deletes user data from the field storage tables.
 *
 * This function is valid for a database schema version 7000.
 *
 * @ingroup update_api
 */
function _update_7000_field_delete_instance($field_name, $entity_type, $bundle) {
  // Delete field instance configuration data.
  db_delete('field_config_instance')
    ->condition('field_name', $field_name)
    ->condition('entity_type', $entity_type)
    ->condition('bundle', $bundle)
    ->execute();

  // Nuke data.
  db_delete('field_data_' . $field_name)
    ->condition('entity_type', $entity_type)
    ->condition('bundle', $bundle)
    ->execute();
  db_delete('field_revision_' . $field_name)
    ->condition('entity_type', $entity_type)
    ->condition('bundle', $bundle)
    ->execute();
}

/**
 * Utility function: fetch all the field definitions from the database.
 *
 * Warning: unlike the field_read_fields() API function, this function returns
 * all fields by default, including deleted and inactive fields, unless
 * specified otherwise in the $conditions parameter.
 *
 * @param $conditions
 *   An array of conditions to limit the select query to.
 * @param $key
 *   The name of the field property the return array is indexed by. Using
 *   anything else than 'id' might cause incomplete results if the $conditions
 *   do not filter out deleted fields.
 *
 * @return
 *   An array of fields matching $conditions, keyed by the property specified
 *   by the $key parameter.
 *
 * @ingroup update_api
 */
function _update_7000_field_read_fields(array $conditions = array(), $key = 'id') {
  $fields = array();
  $query = db_select('field_config', 'fc', array('fetch' => PDO::FETCH_ASSOC))
    ->fields('fc');
  foreach ($conditions as $column => $value) {
    $query->condition($column, $value);
  }
  foreach ($query->execute() as $record) {
    $field = unserialize($record['data']);
    $field['id'] = $record['id'];
    $field['field_name'] = $record['field_name'];
    $field['type'] = $record['type'];
    $field['module'] = $record['module'];
    $field['active'] = $record['active'];
    $field['storage']['type'] = $record['storage_type'];
    $field['storage']['module'] = $record['storage_module'];
    $field['storage']['active'] = $record['storage_active'];
    $field['locked'] = $record['locked'];
    $field['cardinality'] = $record['cardinality'];
    $field['translatable'] = $record['translatable'];
    $field['deleted'] = $record['deleted'];

    $fields[$field[$key]] = $field;
  }
  return $fields;
}

/**
 * Utility function: write a field instance directly to the database.
 *
 * This function can be used for databases whose schema is at field module
 * version 7000 or higher.
 *
 * @ingroup update_api
 */
function _update_7000_field_create_instance($field, &$instance) {
  // Merge in defaults.
  $instance += array(
    'field_id' => $field['id'],
    'field_name' => $field['field_name'],
    'deleted' => 0,
  );

  // The serialized 'data' column contains everything from $instance that does
  // not have its own column and is not automatically populated when the
  // instance is read.
  $data = $instance;
  unset($data['id'], $data['field_id'], $data['field_name'], $data['entity_type'], $data['bundle'], $data['deleted']);

  $record = array(
    'field_id' => $instance['field_id'],
    'field_name' => $instance['field_name'],
    'entity_type' => $instance['entity_type'],
    'bundle' => $instance['bundle'],
    'data' => serialize($data),
    'deleted' => (int) $instance['deleted'],
  );
  $instance['id'] = db_insert('field_config_instance')
    ->fields($record)
    ->execute();
}

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

/**
 * Field update version placeholder.
 */
function field_update_7000() {
  // Some update helper functions (such as _update_7000_field_create_field())
  // modify the database directly. They can be used safely only if the database
  // schema matches the field module schema established for Drupal 7.0 (i.e.
  // version 7000). This function exists solely to set the schema version to
  // 7000, so that update functions calling those helpers can do so safely
  // by declaring a dependency on field_update_7000().
}

/**
 * Fix fields definitions created during the d6 to d7 upgrade path.
 */
function field_update_7001() {
  $fields = _update_7000_field_read_fields();
  foreach ($fields as $field) {
    // _update_7000_field_create_field() was broken in d7 RC2, and the fields
    // created during a d6 to d7 upgrade do not correcly store the 'index'
    // entry. See http://drupal.org/node/996160.

    module_load_install($field['module']);
    $schema = (array) module_invoke($field['module'], 'field_schema', $field);
    $schema += array('indexes' => array());
    // 'indexes' can be both hardcoded in the field type, and specified in the
    // incoming $field definition.
    $field['indexes'] += $schema['indexes'];

    // Place the updated entries in the existing serialized 'data' column.
    $data = db_query("SELECT data FROM {field_config} WHERE id = :id", array(':id' => $field['id']))->fetchField();
    $data = unserialize($data);
    $data['columns'] = $field['columns'];
    $data['indexes'] = $field['indexes'];

    // Save the new data.
    $query = db_update('field_config')
      ->condition('id', $field['id'])
      ->fields(array('data' => serialize($data)))
      ->execute();
  }
}

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

/**
 * @addtogroup updates-7.x-extra
 * @{
 */

/**
 * Split the all-inclusive field_bundle_settings variable per bundle.
 */
function field_update_7002() {
  $settings = variable_get('field_bundle_settings', array());
  if ($settings) {
    foreach ($settings as $entity_type => $entity_type_settings) {
      foreach ($entity_type_settings as $bundle => $bundle_settings) {
        variable_set('field_bundle_settings_' . $entity_type . '__' . $bundle, $bundle_settings);
      }
    }
    variable_del('field_bundle_settings');
  }
}

/**
 * Add the FieldInfo class to the class registry.
 */
function field_update_7003() {
  // Empty update to force a rebuild of the registry.
}

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