<?php

/**
 * @file
 * Sample hooks demonstrating usage in Webform.
 */

/**
 * @defgroup webform_hooks Webform Module Hooks
 * @{
 * Webform's hooks enable other modules to intercept events within Webform, such
 * as the completion of a submission or adding validation. Webform's hooks also
 * allow other modules to provide additional components for use within forms.
 */

/**
 * Define callbacks that can be used as select list options.
 *
 * When users create a select component, they may select a pre-built list of
 * certain options. Webform core provides a few of these lists such as the
 * United States, countries of the world, and days of the week. This hook
 * provides additional lists that may be utilized.
 *
 * @see webform_options_example()
 * @see hook_webform_select_options_info_alter()
 *
 * @return array
 *   An array of callbacks that can be used for select list options. This array
 *   should be keyed by the "name" of the pre-defined list. The values should
 *   be an array with the following additional keys:
 *     - title: The translated title for this list.
 *     - options callback: The name of a function implementing
 *       callback_webform_options() that will return the list.
 *     - options arguments: Any additional arguments to send to the callback.
 *     - file: Optional. The file containing the options callback, relative to
 *       the module root.
 */
function hook_webform_select_options_info() {
  $items = array();

  $items['days'] = array(
    'title' => t('Days of the week'),
    'options callback' => 'webform_options_days',
    'file' => 'includes/webform.options.inc',
  );

  return $items;
}

/**
 * Alter the list of select list options provided by Webform and other modules.
 *
 * @see hook_webform_select_options_info()
 */
function hook_webform_select_options_info_alter(&$items) {
  // Remove the days of the week options.
  unset($items['days']);
}

/**
 * Define a list of options that Webform may use in a select component.
 *
 * Callback for hook_webform_select_options_info().
 *
 * @param $component
 *   The Webform component array for the select component being displayed.
 * @param $flat
 *   Boolean value indicating whether the returned list needs to be a flat array
 *   of key => value pairs. Select components support up to one level of
 *   nesting, but when results are displayed, the list needs to be returned
 *   without the nesting.
 * @param $arguments
 *   The "options arguments" specified in hook_webform_select_options_info().
 *
 * @return array
 *   An array of key => value pairs suitable for a select list's #options
 *   FormAPI property.
 */
function callback_webform_options($component, $flat, $arguments) {
  $options = array(
    'one' => t('Pre-built option one'),
    'two' => t('Pre-built option two'),
    'three' => t('Pre-built option three'),
  );

  return $options;
}

/**
 * Respond to the loading of Webform submissions.
 *
 * @param $submissions
 *   An array of Webform submissions that are being loaded, keyed by the
 *   submission ID. Modifications to the submissions are done by reference.
 */
function hook_webform_submission_load(&$submissions) {
  foreach ($submissions as $sid => $submission) {
    $submissions[$sid]->new_property = 'foo';
  }
}

/**
 * Respond to the creation of a new submission from form values.
 *
 * This hook is called when a user has completed a submission to initialize the
 * submission object. After this object has its values populated, it will be
 * saved by webform_submission_insert(). Note that this hook is only called for
 * new submissions, not for submissions being edited. If responding to the
 * saving of all submissions, it's recommended to use
 * hook_webform_submission_presave().
 *
 * @param $submission
 *   The submission object that has been created.
 * @param $node
 *   The Webform node for which this submission is being saved.
 * @param $account
 *   The user account that is creating the submission.
 * @param $form_state
 *   The contents of form state that is the basis for this submission.
 *
 * @see webform_submission_create()
 */
function hook_webform_submission_create_alter(&$submission, &$node, &$account, &$form_state) {
  $submission->new_property = TRUE;
}

/**
 * Modify a Webform submission, prior to saving it in the database.
 *
 * @param $node
 *   The Webform node on which this submission was made.
 * @param $submission
 *   The Webform submission that is about to be saved to the database.
 */
function hook_webform_submission_presave($node, &$submission) {
  // Update some component's value before it is saved.
  $component_id = 4;
  $submission->data[$component_id][0] = 'foo';
}

/**
 * Respond to a Webform submission being inserted.
 *
 * Note that this hook is called after a submission has already been saved to
 * the database. If needing to modify the submission prior to insertion, use
 * hook_webform_submission_presave().
 *
 * @param $node
 *   The Webform node on which this submission was made.
 * @param $submission
 *   The Webform submission that was just inserted into the database.
 */
function hook_webform_submission_insert($node, $submission) {
  // Insert a record into a 3rd-party module table when a submission is added.
  db_insert('mymodule_table')
    ->fields(array(
      'nid' => $node->nid,
      'sid' => $submission->sid,
      'foo' => 'foo_data',
    ))
    ->execute();
}

/**
 * Respond to a Webform submission being updated.
 *
 * Note that this hook is called after a submission has already been saved to
 * the database. If needing to modify the submission prior to updating, use
 * hook_webform_submission_presave().
 *
 * @param $node
 *   The Webform node on which this submission was made.
 * @param $submission
 *   The Webform submission that was just updated in the database.
 */
function hook_webform_submission_update($node, $submission) {
  // Update a record in a 3rd-party module table when a submission is updated.
  db_update('mymodule_table')
    ->fields(array(
      'foo' => 'foo_data',
    ))
    ->condition('nid', $node->nid)
    ->condition('sid', $submission->sid)
    ->execute();
}

/**
 * Respond to a Webform submission being deleted.
 *
 * @param $node
 *   The Webform node on which this submission was made.
 * @param $submission
 *   The Webform submission that was just deleted from the database.
 */
function hook_webform_submission_delete($node, $submission) {
  // Delete a record from a 3rd-party module table when a submission is deleted.
  db_delete('mymodule_table')
    ->condition('nid', $node->nid)
    ->condition('sid', $submission->sid)
    ->execute();
}

/**
 * Provide a list of actions that can be executed on a submission.
 *
 * Some actions are displayed in the list of submissions such as edit, view, and
 * delete. All other actions are displayed only when viewing the submission.
 * These additional actions may be specified in this hook. Examples included
 * directly in the Webform module include PDF, print, and resend e-mails. Other
 * modules may extend this list by using this hook.
 *
 * @param $node
 *   The Webform node on which this submission was made.
 * @param $submission
 *   The Webform submission on which the actions may be performed.
 *
 * @return array
 *   List of action.
 */
function hook_webform_submission_actions($node, $submission) {
  $actions = array();

  if (webform_results_access($node)) {
    $actions['myaction'] = array(
      'title' => t('Do my action'),
      'href' => 'node/' . $node->nid . '/submission/' . $submission->sid . '/myaction',
      'query' => drupal_get_destination(),
    );
  }

  return $actions;
}

/**
 * Modify the draft to be presented for editing.
 *
 * When drafts are enabled for the webform, by default, a pre-existing draft is
 * presented when the webform is displayed to that user. To allow multiple
 * drafts, implement this alter function to set the $sid to NULL, or use your
 * application's business logic to determine whether a new draft or which of
 * the pre-existing drafts should be presented.
 *
 * @param int $sid
 *   The id of the most recent submission to be presented for editing. Change
 *    to a different draft's sid or set to NULL for a new draft.
 * @param array $context
 *   Array of context with indices 'nid' and 'uid'.
 */
function hook_webform_draft_alter(&$sid, array $context) {
  if ($_GET['newdraft']) {
    $sid = NULL;
  }
}

/**
 * Alter the display of a Webform submission.
 *
 * This function applies to both e-mails sent by Webform and normal display of
 * submissions when viewing through the administrative interface.
 *
 * @param $renderable
 *   The Webform submission in a renderable array, similar to FormAPI's
 *   structure. This variable must be passed in by-reference. Important
 *   properties of this array include #node, #submission, #email, and #format,
 *   which can be used to find the context of the submission that is being
 *   rendered.
 */
function hook_webform_submission_render_alter(&$renderable) {
  // Remove page breaks from sent e-mails.
  if (isset($renderable['#email'])) {
    foreach (element_children($renderable) as $key) {
      if ($renderable[$key]['#component']['type'] == 'pagebreak') {
        unset($renderable[$key]);
      }
    }
  }
}

/**
 * Modify a loaded Webform component.
 *
 * IMPORTANT: This hook does not actually exist because components are loaded
 * in bulk as part of webform_node_load(). Use hook_node_load() to modify loaded
 * components when the node is loaded. This example is provided merely to point
 * to hook_node_load().
 *
 * @see hook_nodeapi()
 * @see webform_node_load()
 */
function hook_webform_component_load() {
  // This hook does not exist. Instead use hook_node_load().
}

/**
 * Modify a Webform component before it is saved to the database.
 *
 * Note that most of the time this hook is not necessary, because Webform will
 * automatically add data to the component based on the component form. Using
 * hook_form_alter() will be sufficient in most cases.
 *
 * @param $component
 *   The Webform component being saved.
 *
 * @see hook_form_alter()
 * @see webform_component_edit_form()
 */
function hook_webform_component_presave(&$component) {
  $component['extra']['new_option'] = 'foo';
}

/**
 * Respond to a Webform component being inserted into the database.
 */
function hook_webform_component_insert($component) {
  // Insert a record into a 3rd-party module table when a component is inserted.
  db_insert('mymodule_table')
    ->fields(array(
      'nid' => $component['nid'],
      'cid' => $component['cid'],
      'foo' => 'foo_data',
    ))
    ->execute();
}

/**
 * Respond to a Webform component being updated in the database.
 */
function hook_webform_component_update($component) {
  // Update a record in a 3rd-party module table when a component is updated.
  db_update('mymodule_table')
    ->fields(array(
      'foo' => 'foo_data',
    ))
    ->condition('nid', $component['nid'])
    ->condition('cid', $component['cid'])
    ->execute();
}

/**
 * Respond to a Webform component being deleted.
 */
function hook_webform_component_delete($component) {
  // Delete a record in a 3rd-party module table when a component is deleted.
  db_delete('mymodule_table')
    ->condition('nid', $component['nid'])
    ->condition('cid', $component['cid'])
    ->execute();
}

/**
 * Alter the entire analysis before rendering to the page on the Analysis tab.
 *
 * This alter hook allows modification of the entire analysis of a node's
 * Webform results. The resulting analysis is displayed on the Results ->
 * Analysis tab on the Webform.
 *
 * @param array $analysis
 *   A Drupal renderable array, passed by reference, containing the entire
 *   contents of the analysis page. This typically will contain the following
 *   two major keys:
 *   - form: The form for configuring the shown analysis.
 *   - components: The list of analyses for each analysis-enabled component
 *     for the node. Each keyed by its component ID.
 */
function hook_webform_analysis_alter(array &$analysis) {
  $node = $analysis['#node'];

  // Add an additional piece of information to every component's analysis:
  foreach (element_children($analysis['components']) as $cid) {
    $component = $node->components[$cid];
    $analysis['components'][$cid]['chart'] = array(
      '#markup' => t('Chart for the @name component', array('@name' => $component['name'])),
    );
  }
}

/**
 * Alter data when displaying an analysis on that component.
 *
 * This hook modifies the data from an individual component's analysis results.
 * It can be used to add additional analysis, or to modify the existing results.
 * If needing to alter the entire set of analyses rather than an individual
 * component, hook_webform_analysis_alter() may be used instead.
 *
 * @param array $data
 *   An array containing the result of a components analysis hook, passed by
 *   reference. This is passed directly from a component's
 *   _webform_analysis_component() function. See that hook for more information
 *   on this value.
 * @param object $node
 *   The node object that contains the component being analyzed.
 * @param array $component
 *   The Webform component array whose analysis results are being displayed.
 *
 * @see _webform_analysis_component()
 * @see hook_webform_analysis_alter()
 */
function hook_webform_analysis_component_data_alter(array &$data, $node, array $component) {
  if ($component['type'] === 'textfield') {
    // Do not display rows that contain a zero value.
    foreach ($data as $row_number => $row_data) {
      if ($row_data[1] === 0) {
        unset($data[$row_number]);
      }
    }
  }
}

/**
 * Alter a Webform submission's header when exported.
 */
function hook_webform_csv_header_alter(&$header, $component) {
  // Use the machine name for component headers, but only for the webform
  // with node 5 and components that are text fields.
  if ($component['nid'] == 5 && $component['type'] == 'textfield') {
    $header[2] = $component['form_key'];
  }
}

/**
 * Alter a Webform submission's data when exported.
 */
function hook_webform_csv_data_alter(&$data, $component, $submission) {
  // If a value of a field was left blank, use the value from another
  // field.
  if ($component['cid'] == 1 && empty($data)) {
    $data = $submission->data[2]['value'][0];
  }
}

/**
 * Define components to Webform.
 *
 * @return array
 *   An array of components, keyed by machine name. Required properties are
 *   "label" and "description". The "features" array defines which capabilities
 *   the component has, such as being displayed in e-mails or csv downloads.
 *   A component like "markup" for example would not show in these locations.
 *   The possible features of a component include:
 *
 *     - csv
 *     - email
 *     - email_address
 *     - email_name
 *     - required
 *     - conditional
 *     - spam_analysis
 *     - group
 *     - private
 *
 *   Note that most of these features do not indicate the default state, but
 *   determine if the component can have this property at all. Setting
 *   "required" to TRUE does not mean that a component's fields will always be
 *   required, but instead give the option to the administrator to choose the
 *   requiredness. See the example implementation for details on how these
 *   features may be set.
 *
 *   An optional "file" may be specified to be loaded when the component is
 *   needed. A set of callbacks will be established based on the name of the
 *   component. All components follow the pattern:
 *
 *   _webform_[callback]_[component]
 *
 *   Where [component] is the name of the key of the component and [callback] is
 *   any of the following:
 *
 *     - defaults
 *     - edit
 *     - render
 *     - display
 *     - submit
 *     - delete
 *     - help
 *     - theme
 *     - analysis
 *     - table
 *     - csv_headers
 *     - csv_data
 *
 *   See the sample component implementation for details on each one of these
 *   callbacks.
 *
 * @see webform_components()
 */
function hook_webform_component_info() {
  $components = array();

  $components['textfield'] = array(
    'label' => t('Textfield'),
    'description' => t('Basic textfield type.'),
    'features' => array(
      // This component includes an analysis callback. Defaults to TRUE.
      'analysis' => TRUE,

      // Add content to CSV downloads. Defaults to TRUE.
      'csv' => TRUE,

      // This component supports default values. Defaults to TRUE.
      'default_value' => FALSE,

      // This component supports a description field. Defaults to TRUE.
      'description' => FALSE,

      // Show this component in e-mailed submissions. Defaults to TRUE.
      'email' => TRUE,

      // Allow this component to be used as an e-mail FROM or TO address.
      // Defaults to FALSE.
      'email_address' => FALSE,

      // Allow this component to be used as an e-mail SUBJECT or FROM name.
      // Defaults to FALSE.
      'email_name' => TRUE,

      // This component may be toggled as required or not. Defaults to TRUE.
      'required' => TRUE,

      // This component supports a title attribute. Defaults to TRUE.
      'title' => FALSE,

      // This component has a title that can be toggled as displayed or not.
      'title_display' => TRUE,

      // This component has a title that can be displayed inline.
      'title_inline' => TRUE,

      // If this component can be used as a conditional SOURCE. All components
      // may always be displayed conditionally, regardless of this setting.
      // Defaults to TRUE.
      'conditional' => TRUE,

      // If this component allows other components to be grouped within it
      // (like a fieldset or tabs). Defaults to FALSE.
      'group' => FALSE,

      // If this component can be used for SPAM analysis.
      'spam_analysis' => FALSE,

      // If this component saves a file that can be used as an e-mail
      // attachment. Defaults to FALSE.
      'attachment' => FALSE,

      // If this component reflects a time range and should use labels such as
      // "Before" and "After" when exposed as filters in Views module.
      'views_range' => FALSE,

      // Set this to FALSE if this component cannot be used as a private
      // component. If this is not FALSE, in your implementation of
      // _webform_defaults_COMPONENT(), set ['extra']['private'] property to
      // TRUE or FALSE.
      'private' => FALSE,
    ),

    // Specify the conditional behaviour of this component.
    // Examples are 'string', 'date', 'time', 'numeric', 'select'.
    // Defaults to 'string'.
    'conditional_type' => 'string',

    'file' => 'components/textfield.inc',
  );

  return $components;
}

/**
 * Alter the list of available Webform components.
 *
 * @param $components
 *   A list of existing components as defined by hook_webform_component_info().
 *
 * @see hook_webform_component_info()
 */
function hook_webform_component_info_alter(&$components) {
  // Completely remove a component.
  unset($components['grid']);

  // Change the name of a component.
  $components['textarea']['label'] = t('Text box');
}

/**
 * Alter the list of Webform component default values.
 *
 * @param $defaults
 *   A list of component defaults as defined by _webform_defaults_COMPONENT().
 * @param $type
 *   The component type whose defaults are being provided.
 *
 * @see _webform_defaults_component()
 */
function hook_webform_component_defaults_alter(&$defaults, $type) {
  // Alter a default for all component types.
  $defaults['required'] = 1;

  // Add a default for a new field added via hook_form_alter() or
  // hook_form_FORM_ID_alter() for all component types.
  $defaults['extra']['added_field'] = t('Added default value');

  // Add or alter defaults for specific component types:
  switch ($type) {
    case 'select':
      $defaults['extra']['optrand'] = 1;
      break;

    case 'textfield':
    case 'textarea':
      $defaults['extra']['another_added_field'] = t('Another added default value');
  }
}

/**
 * Alter access to a Webform submission.
 *
 * @param $node
 *   The Webform node on which this submission was made.
 * @param $submission
 *   The Webform submission.
 * @param $op
 *   The operation to be performed on the submission. Possible values are:
 *   - "view"
 *   - "edit"
 *   - "delete"
 *   - "list"
 * @param $account
 *   A user account object.
 *
 * @return bool
 *   TRUE if the current user has access to submission,
 *   or FALSE otherwise.
 */
function hook_webform_submission_access($node, $submission, $op = 'view', $account = NULL) {
  switch ($op) {
    case 'view':
      return TRUE;

    case 'edit':
      return FALSE;

    case 'delete':
      return TRUE;

    case 'list':
      return TRUE;
  }
}

/**
 * Determine if a user has access to see the results of a webform.
 *
 * Note in addition to the view access to the results granted here, the $account
 * must also have view access to the Webform node in order to see results.
 * Access via this hook is in addition (adds permission) to the standard
 * webform access.
 *
 * @param $node
 *   The Webform node to check access on.
 * @param $account
 *   The user account to check access on.
 *
 * @return bool
 *   TRUE or FALSE if the user can access the webform results.
 *
 * @see webform_results_access()
 */
function hook_webform_results_access($node, $account) {
  // Let editors view results of unpublished webforms.
  if ($node->status == 0 && in_array('editor', $account->roles)) {
    return TRUE;
  }
  else {
    return FALSE;
  }
}

/**
 * Determine if a user has access to clear the results of a webform.
 *
 * Access via this hook is in addition (adds permission) to the standard
 * webform access (delete all webform submissions).
 *
 * @param object $node
 *   The Webform node to check access on.
 * @param object $account
 *   The user account to check access on.
 *
 * @return bool
 *   TRUE or FALSE if the user can access the webform results.
 *
 * @see webform_results_clear_access()
 */
function hook_webform_results_clear_access($node, $account) {
  return user_access('my additional access', $account);
}

/**
 * Overrides the node_access and user_access permissions.
 *
 * Overrides the node_access and user_access permission to access and edit
 * webform components, e-mails, conditions, and form settings.
 *
 * Return NULL to defer to other modules. If all implementations defer, then
 * access to the node's EDIT tab plus 'edit webform components' permission
 * determines access. To grant access, return TRUE; to deny access, return
 * FALSE. If more than one implementation return TRUE/FALSE, all must be TRUE
 * to grant access.
 *
 * In this way, access to the EDIT tab of the node may be decoupled from
 * access to the WEBFORM tab. When returning TRUE, consider all aspects of
 * access as this will be the only test. For example, 'return TRUE;' would grant
 * annonymous access to creating webform components, which seldom be desired.
 *
 * @param object $node
 *   The Webform node to check access on.
 * @param object $account
 *   The user account to check access on.
 *
 * @return bool|null
 *   TRUE or FALSE if the user can access the webform results, or NULL if
 *   access should be deferred to other implementations of this hook or
 *   node_access('update') plus user_access('edit webform components').
 *
 * @see webform_node_update_access()
 */
function hook_webform_update_access($node, $account) {
  // Allow anyone who can see webform_editable_by_user nodes and who has
  // 'my webform component edit access' permission to see, edit, and delete the
  // webform components, e-mails, conditionals, and form settings.
  if ($node->type == 'webform_editable_by_user') {
    return node_access('view', $node, $account) && user_access('my webform component edit access', $account);
  }
}

/**
 * Return an array of files associated with the component.
 *
 * The output of this function will be used to attach files to e-mail messages.
 *
 * @param $component
 *   A Webform component array.
 * @param $value
 *   An array of information containing the submission result, directly
 *   correlating to the webform_submitted_data database schema.
 *
 * @return array
 *   An array of files, each file is an array with following keys:
 *     - filepath: The relative path to the file.
 *     - filename: The name of the file including the extension.
 *     - filemime: The mimetype of the file.
 *   This will result in an array looking something like this:
 *
 * @code
 *   array[0] => array(
 *     'filepath' => '/sites/default/files/attachment.txt',
 *     'filename' => 'attachment.txt',
 *     'filemime' => 'text/plain',
 *   );
 * @endcode
 */
function _webform_attachments_component($component, $value) {
  $files = array();
  $files[] = (array) file_load($value[0]);
  return $files;
}

/**
 * Alter default settings for a newly created webform node.
 *
 * @param array $defaults
 *   Default settings for a newly created webform node as defined by
 *   webform_node_defaults().
 *
 * @see webform_node_defaults()
 */
function hook_webform_node_defaults_alter(array &$defaults) {
  $defaults['allow_draft'] = '1';
}

/**
 * Add additional fields to submission data downloads.
 *
 * @return array
 *   Keys and titles for default submission information.
 *
 * @see hook_webform_results_download_submission_information_data()
 */
function hook_webform_results_download_submission_information_info() {
  return array(
    'field_key_1' => t('Field Title 1'),
    'field_key_2' => t('Field Title 2'),
  );
}

/**
 * Return values for submission data download fields.
 *
 * @param $token
 *   The name of the token being replaced.
 * @param $submission
 *   The data for an individual submission from webform_get_submissions().
 * @param array $options
 *   A list of options that define the output format. These are generally passed
 *   through from the GUI interface.
 * @param $serial_start
 *   The starting position for the Serial column in the output.
 * @param $row_count
 *   The number of the row being generated.
 *
 * @return string
 *   Value for requested submission information field.
 *
 * @see hook_webform_results_download_submission_information_info()
 */
function hook_webform_results_download_submission_information_data($token, $submission, array $options, $serial_start, $row_count) {
  switch ($token) {
    case 'field_key_1':
      return 'Field Value 1';

    case 'field_key_2':
      return 'Field Value 2';
  }
}

/**
 * Alter the query that will produce the list of submission IDs to be
 * downloaded.
 *
 * @param object $query
 *   The query object that is being built up to provide the list of submission
 *   IDs.
 *
 * @see webform_download_sids_query()
 */
function hook_webform_download_sids_query_alter(&$query) {
  global $user;

  // check if component value matches a node ID and author of that node.
  $query->join('webform_submitted_data', 'wsd', 'ws.sid = wsd.sid');
  $query->condition('wsd.cid', 2);
  $query->join('node', 'n', 'wsd.data = n.nid');
  $query->condition('n.uid', $user->uid);
}

/**
 * @}
 */

/**
 * @defgroup webform_component Sample Webform Component
 * @{
 * In each of these examples, the word "component" should be replaced with the,
 * name of the component type (such as textfield or select). These are not
 * actual hooks, but instead samples of how Webform integrates with its own
 * built-in components.
 */

/**
 * Specify the default properties of a component.
 *
 * @return array
 *   An array defining the default structure of a component.
 */
function _webform_defaults_component() {
  return array(
    'name' => '',
    'form_key' => NULL,
    'required' => 0,
    'pid' => 0,
    'weight' => 0,
    'extra' => array(
      'options' => '',
      'questions' => '',
      'optrand' => 0,
      'qrand' => 0,
      'description' => '',
      'description_above' => FALSE,
      'private' => FALSE,
      'analysis' => TRUE,
    ),
  );
}

/**
 * Generate the form for editing a component.
 *
 * Create a set of form elements to be displayed on the form for editing this
 * component. Use care naming the form items, as this correlates directly to the
 * database schema. The component "Name" and "Description" fields are added to
 * every component type and are not necessary to specify here (although they
 * may be overridden if desired).
 *
 * @param array $component
 *   A Webform component array.
 * @param array $form
 *   The form array.
 * @param array $form_state
 *   The form state array.
 *
 * @return array
 *   Return $form with whatever changes are desired.
 */
function _webform_edit_component(array $component, array $form, array $form_state) {
  // Disabling the description if not wanted.
  $form['description']['#access'] = FALSE;

  // Most options are stored in the "extra" array, which stores any settings
  // unique to a particular component type.
  $form['extra']['options'] = array(
    '#type' => 'textarea',
    '#title' => t('Options'),
    '#default_value' => $component['extra']['options'],
    '#description' => t('Key-value pairs may be entered separated by pipes. i.e. safe_key|Some readable option') . ' ' . theme('webform_token_help'),
    '#cols' => 60,
    '#rows' => 5,
    '#weight' => -3,
    '#required' => TRUE,
  );
  return $form;
}

/**
 * Render a Webform component to be part of a form.
 *
 * @param $component
 *   A Webform component array.
 * @param $value
 *   If editing an existing submission or resuming a draft, this will contain
 *   an array of values to be shown instead of the default in the component
 *   configuration. This value will always be an array, keyed numerically for
 *   each value saved in this field.
 * @param $filter
 *   Whether or not to filter the contents of descriptions and values when
 *   rendering the component. Values need to be unfiltered to be editable by
 *   Form Builder.
 * @param $submission
 *   The submission from which this component is being rendered. Usually not
 *   needed. Used by _webform_render_date() to validate using the submission's
 *   completion date.
 *
 * @return array
 *   $form_item
 *
 * @see _webform_client_form_add_component()
 */
function _webform_render_component($component, $value = NULL, $filter = TRUE, $submission = NULL) {
  $form_item = array(
    '#type' => 'textfield',
    '#title' => $filter ? webform_filter_xss($component['name']) : $component['name'],
    '#required' => $component['required'],
    '#weight' => $component['weight'],
    '#description'   => $filter ? webform_filter_descriptions($component['extra']['description']) : $component['extra']['description'],
    '#default_value' => $filter ? webform_replace_tokens($component['value']) : $component['value'],
    '#theme_wrappers' => array('webform_element'),
  );

  if (isset($value)) {
    $form_item['#default_value'] = $value[0];
  }

  return $form_item;
}

/**
 * Allow modules to modify a webform component that will be rendered in a form.
 *
 * @param array $element
 *   The display element as returned by _webform_render_component().
 * @param array $component
 *   A Webform component array.
 *
 * @see _webform_render_component()
 */
function hook_webform_component_render_alter(array &$element, array &$component) {
  if ($component['cid'] == 10) {
    $element['#title'] = 'My custom title';
    $element['#default_value'] = 42;
  }
}

/**
 * Display the result of a submission for a component.
 *
 * The output of this function will be displayed under the "Results" tab then
 * "Submissions". This should output the saved data in some reasonable manner.
 *
 * @param $component
 *   A Webform component array.
 * @param $value
 *   An array of information containing the submission result, directly
 *   correlating to the webform_submitted_data database table schema.
 * @param $format
 *   Either 'html' or 'text'. Defines the format that the content should be
 *   returned as. Make sure that returned content is run through check_plain()
 *   or other filtering functions when returning HTML.
 * @param $submission
 *   The submission. Used to generate tokens.
 *
 * @return array
 *   A renderable element containing at the very least these properties:
 *    - #title
 *    - #weight
 *    - #component
 *    - #format
 *    - #value
 *   Webform also uses #theme_wrappers to output the end result to the user,
 *   which will properly format the label and content for use within an e-mail
 *   (such as wrapping the text) or as HTML (ensuring consistent output).
 */
function _webform_display_component($component, $value, $format = 'html', $submission = array()) {
  return array(
    '#title' => $component['name'],
    '#weight' => $component['weight'],
    '#theme' => 'webform_display_textfield',
    '#theme_wrappers' => $format == 'html' ? array('webform_element') : array('webform_element_text'),
    '#post_render' => array('webform_element_wrapper'),
    '#field_prefix' => $component['extra']['field_prefix'],
    '#field_suffix' => $component['extra']['field_suffix'],
    '#component' => $component,
    '#format' => $format,
    '#value' => isset($value[0]) ? $value[0] : '',
  );
}

/**
 * Allow modules to modify a "display only" webform component.
 *
 * @param array $element
 *   The display element as returned by _webform_display_component().
 * @param array $component
 *   A Webform component array.
 *
 * @see _webform_display_component()
 */
function hook_webform_component_display_alter(array &$element, array &$component) {
  if ($component['cid'] == 10) {
    $element['#title'] = 'My custom title';
    $element['#default_value'] = 42;
  }
}

/**
 * Performs the conditional action set on an implemented component.
 *
 * Setting the form element allows form validation functions to see the value
 * that webform has set for the given component.
 *
 * @param array $component
 *   The webform component array whose value is being set for the currently-
 *   edited submission.
 * @param array $element
 *   The form element currently being set.
 * @param array $form_state
 *   The form's state.
 * @param string $value
 *   The value to be set, as defined in the conditional action.
 */
function _webform_action_set_component(array $component, array &$element, array &$form_state, $value) {
  $element['#value'] = $value;
  form_set_value($element, $value, $form_state);
}

/**
 * A hook for changing the input values before saving to the database.
 *
 * Webform expects a component to consist of a single field, or a single array
 * of fields. If you have a component that requires a deeper form tree
 * you must flatten the data into a single array using this callback
 * or by setting #parents on each field to avoid data loss and/or unexpected
 * behavior.
 *
 * Note that Webform will save the result of this function directly into the
 * database.
 *
 * @param $component
 *   A Webform component array.
 * @param $value
 *   The POST data associated with the user input.
 *
 * @return array
 *   An array of values to be saved into the database. Note that this should be
 *   a numerically keyed array.
 */
function _webform_submit_component($component, $value) {
  // Clean up a phone number into 123-456-7890 format.
  if ($component['extra']['phone_number']) {
    $number = preg_replace('/[^0-9]/', '', $value[0]);
    if (strlen($number) == 7) {
      $number = substr($number, 0, 3) . '-' . substr($number, 3, 4);
    }
    else {
      $number = substr($number, 0, 3) . '-' . substr($number, 3, 3) . '-' . substr($number, 6, 4);
    }
  }

  $value[0] = $number;
  return $value;
}

/**
 * Delete operation for a component or submission.
 *
 * @param $component
 *   A Webform component array.
 * @param $value
 *   An array of information containing the submission result, directly
 *   correlating to the webform_submitted_data database schema.
 */
function _webform_delete_component($component, $value) {
  // Delete corresponding files when a submission is deleted.
  if (!empty($value[0]) && ($file = webform_get_file($value[0]))) {
    file_usage_delete($file, 'webform');
    file_delete($file);
  }
}

/**
 * Module specific instance of hook_help().
 *
 * This allows each Webform component to add information into hook_help().
 */
function _webform_help_component($section) {
  switch ($section) {
    case 'admin/config/content/webform#grid_description':
      return t('Allows creation of grid questions, denoted by radio buttons.');
  }
}

/**
 * Module specific instance of hook_theme().
 *
 * This allows each Webform component to add information into hook_theme(). If
 * you specify a file to include, you must define the path to the module that
 * this file belongs to.
 */
function _webform_theme_component() {
  return array(
    'webform_grid' => array(
      'render element' => 'element',
      'file' => 'components/grid.inc',
      'path' => drupal_get_path('module', 'webform'),
    ),
    'webform_display_grid' => array(
      'render element' => 'element',
      'file' => 'components/grid.inc',
      'path' => drupal_get_path('module', 'webform'),
    ),
  );
}

/**
 * Calculate and returns statistics about results for this component.
 *
 * This takes into account all submissions to this webform. The output of this
 * function will be displayed under the "Results" tab then "Analysis".
 *
 * @param $component
 *   An array of information describing the component, directly correlating to
 *   the webform_component database schema.
 * @param $sids
 *   An optional array of submission IDs (sid). If supplied, the analysis will
 *   be limited to these sids.
 * @param $single
 *   Boolean flag determining if the details about a single component are being
 *   shown. May be used to provided detailed information about a single
 *   component's analysis, such as showing "Other" options within a select list.
 * @param $join
 *   An optional SelectQuery object to be used to join with the submissions
 *   table to restrict the submissions being analyzed.
 *
 * @return array
 *   An array containing one or more of the following keys:
 *   - table_rows: If this component has numeric data that can be represented in
 *     a grid, return the values here. This array assumes a 2-dimensional
 *     structure, with the first value being a label and subsequent values
 *     containing a decimal or integer.
 *   - table_header: If this component has more than a single set of values,
 *     include a table header so each column can be labeled.
 *   - other_data: If your component has non-numeric data to include, such as
 *     a description or link, include that in the other_data array. Each item
 *     may be a string or an array of values that matches the number of columns
 *     in the table_header property.
 *   At the very least, either table_rows or other_data should be provided.
 *   Note that if you want your component's analysis to be available by default
 *   without the user specifically enabling it, you must set
 *   $component['extra']['analysis'] = TRUE in your
 *   _webform_defaults_component() callback.
 *
 * @see _webform_defaults_component()
 */
function _webform_analysis_component($component, $sids = array(), $single = FALSE, $join = NULL) {
  // Generate the list of options and questions.
  $options = _webform_select_options_from_text($component['extra']['options'], TRUE);
  $questions = _webform_select_options_from_text($component['extra']['questions'], TRUE);

  // Generate a lookup table of results.
  $query = db_select('webform_submitted_data', 'wsd')
    ->fields('wsd', array('no', 'data'))
    ->condition('nid', $component['nid'])
    ->condition('cid', $component['cid'])
    ->condition('data', '', '<>')
    ->groupBy('no')
    ->groupBy('data');
  $query->addExpression('COUNT(sid)', 'datacount');

  if (count($sids)) {
    $query->condition('sid', $sids, 'IN');
  }

  if ($join) {
    $query->innerJoin($join, 'ws2_', 'wsd.sid = ws2_.sid');
  }

  $result = $query->execute();
  $counts = array();
  foreach ($result as $data) {
    $counts[$data->no][$data->data] = $data->datacount;
  }

  // Create an entire table to be put into the returned row.
  $rows = array();
  $header = array('');

  // Add options as a header row.
  foreach ($options as $option) {
    $header[] = $option;
  }

  // Add questions as each row.
  foreach ($questions as $qkey => $question) {
    $row = array($question);
    foreach ($options as $okey => $option) {
      $row[] = !empty($counts[$qkey][$okey]) ? $counts[$qkey][$okey] : 0;
    }
    $rows[] = $row;
  }

  $other = array();
  $other[] = l(t('More information'), 'node/' . $component['nid'] . '/webform-results/analysis/' . $component['cid']);

  return array(
    'table_header' => $header,
    'table_rows' => $rows,
    'other_data' => $other,
  );
}

/**
 * Return the result of a component value for display in a table.
 *
 * The output of this function will be displayed under the "Results" tab then
 * "Table".
 *
 * @param $component
 *   A Webform component array.
 * @param $value
 *   An array of information containing the submission result, directly
 *   correlating to the webform_submitted_data database schema.
 *
 * @return string
 *   Textual output formatted for human reading.
 */
function _webform_table_component($component, $value) {
  $questions = array_values(_webform_component_options($component['extra']['questions']));
  $output = '';
  // Set the value as a single string.
  if (is_array($value)) {
    foreach ($value as $item => $value) {
      if ($value !== '') {
        $output .= $questions[$item] . ': ' . check_plain($value) . '<br />';
      }
    }
  }
  else {
    $output = check_plain(!isset($value['0']) ? '' : $value['0']);
  }
  return $output;
}

/**
 * Return the header for this component to be displayed in a CSV file.
 *
 * The output of this function will be displayed under the "Results" tab then
 * "Download".
 *
 * @param $component
 *   A Webform component array.
 * @param $export_options
 *   An array of options that may configure export of this field.
 *
 * @return array
 *   An array of data to be displayed in the first three rows of a CSV file, not
 *   including either prefixed or trailing commas.
 */
function _webform_csv_headers_component($component, $export_options) {
  $header = array();
  $header[0] = array('');
  $header[1] = array($export_options['header_keys'] ? $component['form_key'] : $component['name']);
  $items = _webform_component_options($component['extra']['questions']);
  $count = 0;
  foreach ($items as $key => $item) {
    // Empty column per sub-field in main header.
    if ($count != 0) {
      $header[0][] = '';
      $header[1][] = '';
    }
    // The value for this option.
    $header[2][] = $item;
    $count++;
  }

  return $header;
}

/**
 * Format the submitted data of a component for CSV downloading.
 *
 * The output of this function will be displayed under the "Results" tab then
 * "Download".
 *
 * @param $component
 *   A Webform component array.
 * @param $export_options
 *   An array of options that may configure export of this field.
 * @param $value
 *   An array of information containing the submission result, directly
 *   correlating to the webform_submitted_data database schema.
 *
 * @return array
 *   An array of items to be added to the CSV file. Each value within the array
 *   will be another column within the file. This function is called once for
 *   every row of data.
 */
function _webform_csv_data_component($component, $export_options, $value) {
  $questions = array_keys(_webform_select_options($component['extra']['questions']));
  $return = array();
  foreach ($questions as $key => $question) {
    $return[] = isset($value[$key]) ? $value[$key] : '';
  }
  return $return;
}

/**
 * Fix the view field(s) that are automatically generated for number components.
 *
 * Provides each component the opportunity to adjust how this component is
 * displayed in a view as a field in a view table. For example, a component may
 * modify how it responds to click-sorting. Or it may add additional fields,
 * such as a grid component having a column for each question.
 *
 * @param array $component
 *   A Webform component array.
 * @param array $fields
 *   An array of field-definition arrays. Will be passed one field definition,
 *   which may be modified. Additional fields may be added to the array.
 *
 * @return array
 *   The modified $fields array.
 */
function _webform_view_field_component(array $component, array $fields) {
  foreach ($fields as &$field) {
    $field['webform_datatype'] = 'number';
  }
  return $fields;
}

/**
 * Modify the how a view was expanded to show all the components.
 *
 * This alter function is only called when the view is actually modified. It
 * provides modules an opportunity to alter the changes that webform made to
 * the view.
 *
 * This hook is called from webform_views_pre_view. If another module also
 * changes views by implementing this same views hook, the relative order of
 * execution of the two implementations will depend upon the module weights of
 * the two modules. Using hook_webform_view_alter instead guarantees an
 * opportunity to modify the view AFTER webform.
 *
 * @param object $view
 *   The view object.
 * @param string $display_id
 *   The display_id that was expanded by webform.
 * @param array $args
 *   The arguments that were passed to the view.
 */
function hook_webform_view_alter($view, $display_id, array $args) {
  // Don't show component with cid == 4.
  $fields = $view->get_items('field', $display_id);
  foreach ($fields as $id => $field) {
    if (isset($field['webform_cid']) && $field['webform_cid'] == 4) {
      unset($fields[$id]);
    }
  }
  $view->display[$display_id]->handler->set_option('fields', $fields);
}

/**
 * Modify the list of mail systems that are capable of sending HTML email.
 *
 * @param array &$systems
 *   An array of mail system class names.
 */
function hook_webform_html_capable_mail_systems_alter(array &$systems) {
  if (module_exists('my_module')) {
    $systems[] = 'MyModuleMailSystem';
  }
}

/**
 * Define a list of webform exporters.
 *
 * @return array
 *   A list of the available exporters provided by the module.
 *
 * @see webform_webform_exporters()
 */
function hook_webform_exporters() {
  $exporters = array(
    'webform_exporter_custom' => array(
      'title' => t('Webform exporter name'),
      'description' => t('The description for this exporter.'),
      'handler' => 'webform_exporter_custom',
      'file' => drupal_get_path('module', 'yourmodule') . '/includes/webform_exporter_custom.inc',
      'weight' => 10,
    ),
  );

  return $exporters;
}

/**
 * Modify the list of webform exporters definitions.
 *
 * @param array &$exporters
 *   A list of all available webform exporters.
 */
function hook_webform_exporters_alter(array &$exporters) {
  $exporters['excel']['handler'] = 'customized_excel_exporter';
  $exporters['excel']['file'] = drupal_get_path('module', 'yourmodule') . '/includes/customized_excel_exporter.inc';
}

/**
 * Declare conditional types and their operators.
 *
 * Each conditional type defined here may then be referenced in
 * hook_webform_component_info(). For each type this hook also declares a set of
 * operators that may be applied to a component of this conditional type in
 * conditionals.
 *
 * @return array
 *   A 2-dimensional array of operator configurations. The configurations are
 *   keyed first by their conditional type then by operator key. Each operator
 *   declaration is an array with the following keys:
 *   - label: Translated label for this operator that is shown in the UI.
 *   - comparison callback: A callback for server-side evaluation.
 *   - js comparison callback: A JavaScript callback for client-side evaluation.
 *     The callback will be looked for in the Drupal.webform object.
 *   - form callback (optional): A form callback that allows configuring
 *     additional parameters for this operator. Default:
 *     'webform_conditional_operator_text'.
 *
 * @see hook_webform_component_info()
 * @see callback_webform_conditional_comparision_operator()
 * @see callback_webform_conditional_rule_value_form()
 */
function hook_webform_conditional_operator_info() {
  $operators = array();
  $operators['string']['not_equal'] = array(
    'label' => t('is not'),
    'comparison callback' => 'webform_conditional_operator_string_not_equal',
    'js comparison callback' => 'conditionalOperatorStringNotEqual',
  );
  return $operators;
}

/**
 * Alter the list of operators and conditional types.
 *
 * @param array $operators
 *   A data structure as described in hook_webform_conditional_operator_info().
 *
 * @see hook_webform_conditional_operator_info()
 */
function hook_webform_conditional_operators_alter(array &$operators) {
  $operators['string']['not_equal']['label'] = t('not equal');
}

/**
 * Evaluate the operator for a given set of values.
 *
 * This function will be called two times with potentially different kinds of
 * values: Once in _webform_client_form_validate() before any of the validate
 * handlers or the _webform_submit_COMPONENT() callback is called, and once in
 * webform_client_form_pages() after those handlers have been called.
 *
 * @param array $input_values
 *   The values received from the browser.
 * @param mixed $rule_value
 *   The value as configured in the form callback.
 * @param array $component
 *   The component for which we are evaluating the operator.
 *
 * @return bool
 *   The operation result.
 */
function callback_webfom_conditional_comparison_operator(array $input_values, $rule_value, array $component) {
  foreach ($input_values as $value) {
    if (strcasecmp($value, $rule_value)) {
      return TRUE;
    }
  }
  return FALSE;
}

/**
 * Define a form element that configures your operator.
 *
 * @param object $node
 *   The node for which the conditionals are being configured.
 *
 * @return string|string[]
 *   Either a single rendered form element or a rendered form element per
 *   component (keyed by cid). Make sure that none of the rendered strings
 *   contains any HTML IDs as the form element will be rendered multiple times.
 *   The JavaScript will take care of adding the appropriate name attributes.
 *
 * @see _webform_conditional_expand_value_forms()
 */
function callback_webform_conditional_rule_value_form($node) {
  $forms = [];
  foreach ($node->webform['components'] as $cid => $component) {
    if (webform_component_property($component['type'], 'conditional_type') == 'newsletter') {
      $element = [
        '#type' => 'select',
        '#options' => [
          'yes' => t('Opt-in'),
          'no' => t('No opt-in'),
        ],
      ];
      $forms[$cid] = drupal_render($element);
    }
  }
  return $forms;
}

/**
 * @}
 */