<?php

/**

 * @file

 * Page callbacks for adding, editing, deleting, and revisions management for content.

 */

/**

 * Menu callback; presents the node editing form.

 */

function node_page_edit($node) {

  $type_name = node_type_get_name($node);

  drupal_set_title(t('<em>Edit @type</em> @title', array('@type' => $type_name, '@title' => $node->title)), PASS_THROUGH);

  return drupal_get_form($node->type . '_node_form', $node);

}

/**

 * Page callback: Displays add content links for available content types.

 *

 * Redirects to node/add/[type] if only one content type is available.

 *

 * @see node_menu()

 */

function node_add_page() {

  $item = menu_get_item();

  $content = system_admin_menu_block($item);

  // Bypass the node/add listing if only one content type is available.

  if (count($content) == 1) {

    $item = array_shift($content);

    drupal_goto($item['href']);

  }

  return theme('node_add_list', array('content' => $content));

}

/**

 * Returns HTML for a list of available node types for node creation.

 *

 * @param $variables

 *   An associative array containing:

 *   - content: An array of content types.

 *

 * @ingroup themeable

 */

function theme_node_add_list($variables) {

  $content = $variables['content'];

  $output = '';

  if ($content) {

    $output = '<dl class="node-type-list">';

    foreach ($content as $item) {

      $output .= '<dt>' . l($item['title'], $item['href'], $item['localized_options']) . '</dt>';

      $output .= '<dd>' . filter_xss_admin($item['description']) . '</dd>';

    }

    $output .= '</dl>';

  }

  else {

    $output = '<p>' . t('You have not created any content types yet. Go to the <a href="@create-content">content type creation page</a> to add a new content type.', array('@create-content' => url('admin/structure/types/add'))) . '</p>';

  }

  return $output;

}

/**

 * Returns a node submission form.

 *

 * @param $type

 *   The node type for the submitted node.

 *

 * @return

 *   The themed form.

 */

function node_add($type) {

  global $user;

  $types = node_type_get_types();

  $node = (object) array('uid' => $user->uid, 'name' => (isset($user->name) ? $user->name : ''), 'type' => $type, 'language' => LANGUAGE_NONE);

  drupal_set_title(t('Create @name', array('@name' => $types[$type]->name)), PASS_THROUGH);

  $output = drupal_get_form($type . '_node_form', $node);

  return $output;

}

/**

 * Form validation handler for node_form().

 *

 * @see node_form()

 * @see node_form_submit()

 */

function node_form_validate($form, &$form_state) {

  // $form_state['node'] contains the actual entity being edited, but we must

  // not update it with form values that have not yet been validated, so we

  // create a pseudo-entity to use during validation.

  $node = (object) $form_state['values'];

  node_validate($node, $form, $form_state);

  entity_form_field_validate('node', $form, $form_state);

}

/**

 * Form constructor for the node add/edit form.

 *

 * @see node_form_validate()

 * @see node_form_submit()

 * @see node_form_build_preview()

 * @see node_form_delete_submit()

 * @ingroup forms

 */

function node_form($form, &$form_state, $node) {

  global $user;

  // During initial form build, add the node entity to the form state for use

  // during form building and processing. During a rebuild, use what is in the

  // form state.

  if (!isset($form_state['node'])) {

    if (!isset($node->title)) {

      $node->title = NULL;

    }

    node_object_prepare($node);

    $form_state['node'] = $node;

  }

  else {

    $node = $form_state['node'];

  }

  // Some special stuff when previewing a node.

  if (isset($form_state['node_preview'])) {

    $form['#prefix'] = $form_state['node_preview'];

    $node->in_preview = TRUE;

  }

  else {

    unset($node->in_preview);

  }

  // Identify this as a node edit form.

  // @todo D8: Remove. Modules can implement hook_form_BASE_FORM_ID_alter() now.

  $form['#node_edit_form'] = TRUE;

  $form['#attributes']['class'][] = 'node-form';

  if (!empty($node->type)) {

    $form['#attributes']['class'][] = 'node-' . $node->type . '-form';

  }

  // Basic node information.

  // These elements are just values so they are not even sent to the client.

  foreach (array('nid', 'vid', 'uid', 'created', 'type', 'language') as $key) {

    $form[$key] = array(

      '#type' => 'value',

      '#value' => isset($node->$key) ? $node->$key : NULL,

    );

  }

  // Changed must be sent to the client, for later overwrite error checking.

  $form['changed'] = array(

    '#type' => 'hidden',

    '#default_value' => isset($node->changed) ? $node->changed : NULL,

  );

  // Invoke hook_form() to get the node-specific bits. Can't use node_invoke(),

  // because hook_form() needs to be able to receive $form_state by reference.

  // @todo hook_form() implementations are unable to add #validate or #submit

  //   handlers to the form buttons below. Remove hook_form() entirely.

  $function = node_type_get_base($node) . '_form';

  if (function_exists($function) && ($extra = $function($node, $form_state))) {

    $form = array_merge_recursive($form, $extra);

  }

  // If the node type has a title, and the node type form defined no special

  // weight for it, we default to a weight of -5 for consistency.

  if (isset($form['title']) && !isset($form['title']['#weight'])) {

    $form['title']['#weight'] = -5;

  }

  // @todo D8: Remove. Modules should access the node using $form_state['node'].

  $form['#node'] = $node;

  $form['additional_settings'] = array(

    '#type' => 'vertical_tabs',

    '#weight' => 99,

  );

  // Add a log field if the "Create new revision" option is checked, or if the

  // current user has the ability to check that option.

  $form['revision_information'] = array(

    '#type' => 'fieldset',

    '#title' => t('Revision information'),

    '#collapsible' => TRUE,

    // Collapsed by default when "Create new revision" is unchecked

    '#collapsed' => !$node->revision,

    '#group' => 'additional_settings',

    '#attributes' => array(

      'class' => array('node-form-revision-information'),

    ),

    '#attached' => array(

      'js' => array(drupal_get_path('module', 'node') . '/node.js'),

    ),

    '#weight' => 20,

    '#access' => $node->revision || user_access('administer nodes'),

  );

  $form['revision_information']['revision'] = array(

    '#type' => 'checkbox',

    '#title' => t('Create new revision'),

    '#default_value' => $node->revision,

    '#access' => user_access('administer nodes'),

  );

  // Check the revision log checkbox when the log textarea is filled in.

  // This must not happen if "Create new revision" is enabled by default, since

  // the state would auto-disable the checkbox otherwise.

  if (!$node->revision) {

    $form['revision_information']['revision']['#states'] = array(

      'checked' => array(

        'textarea[name="log"]' => array('empty' => FALSE),

      ),

    );

  }

  $form['revision_information']['log'] = array(

    '#type' => 'textarea',

    '#title' => t('Revision log message'),

    '#rows' => 4,

    '#default_value' => !empty($node->log) ? $node->log : '',

    '#description' => t('Provide an explanation of the changes you are making. This will help other authors understand your motivations.'),

  );

  // Node author information for administrators

  $form['author'] = array(

    '#type' => 'fieldset',

    '#access' => user_access('administer nodes'),

    '#title' => t('Authoring information'),

    '#collapsible' => TRUE,

    '#collapsed' => TRUE,

    '#group' => 'additional_settings',

    '#attributes' => array(

      'class' => array('node-form-author'),

    ),

    '#attached' => array(

      'js' => array(

        drupal_get_path('module', 'node') . '/node.js',

        array(

          'type' => 'setting',

          'data' => array('anonymous' => variable_get('anonymous', t('Anonymous'))),

        ),

      ),

    ),

    '#weight' => 90,

  );

  $form['author']['name'] = array(

    '#type' => 'textfield',

    '#title' => t('Authored by'),

    '#maxlength' => 60,

    '#autocomplete_path' => 'user/autocomplete',

    '#default_value' => !empty($node->name) ? $node->name : '',

    '#weight' => -1,

    '#description' => t('Leave blank for %anonymous.', array('%anonymous' => variable_get('anonymous', t('Anonymous')))),

  );

  $form['author']['date'] = array(

    '#type' => 'textfield',

    '#title' => t('Authored on'),

    '#maxlength' => 25,

    '#description' => t('Format: %time. The date format is YYYY-MM-DD and %timezone is the time zone offset from UTC. Leave blank to use the time of form submission.', array('%time' => !empty($node->date) ? date_format(date_create($node->date), 'Y-m-d H:i:s O') : format_date($node->created, 'custom', 'Y-m-d H:i:s O'), '%timezone' => !empty($node->date) ? date_format(date_create($node->date), 'O') : format_date($node->created, 'custom', 'O'))),

    '#default_value' => !empty($node->date) ? $node->date : '',

  );

  // Node options for administrators

  $form['options'] = array(

    '#type' => 'fieldset',

    '#access' => user_access('administer nodes'),

    '#title' => t('Publishing options'),

    '#collapsible' => TRUE,

    '#collapsed' => TRUE,

    '#group' => 'additional_settings',

    '#attributes' => array(

      'class' => array('node-form-options'),

    ),

    '#attached' => array(

      'js' => array(drupal_get_path('module', 'node') . '/node.js'),

    ),

    '#weight' => 95,

  );

  $form['options']['status'] = array(

    '#type' => 'checkbox',

    '#title' => t('Published'),

    '#default_value' => $node->status,

  );

  $form['options']['promote'] = array(

    '#type' => 'checkbox',

    '#title' => t('Promoted to front page'),

    '#default_value' => $node->promote,

  );

  $form['options']['sticky'] = array(

    '#type' => 'checkbox',

    '#title' => t('Sticky at top of lists'),

    '#default_value' => $node->sticky,

  );

  // Add the buttons.

  $form['actions'] = array('#type' => 'actions');

  $form['actions']['submit'] = array(

    '#type' => 'submit',

    '#access' => variable_get('node_preview_' . $node->type, DRUPAL_OPTIONAL) != DRUPAL_REQUIRED || (!form_get_errors() && isset($form_state['node_preview'])),

    '#value' => t('Save'),

    '#weight' => 5,

    '#submit' => array('node_form_submit'),

  );

  $form['actions']['preview'] = array(

    '#access' => variable_get('node_preview_' . $node->type, DRUPAL_OPTIONAL) != DRUPAL_DISABLED,

    '#type' => 'submit',

    '#value' => t('Preview'),

    '#weight' => 10,

    '#submit' => array('node_form_build_preview'),

  );

  if (!empty($node->nid) && node_access('delete', $node)) {

    $form['actions']['delete'] = array(

      '#type' => 'submit',

      '#value' => t('Delete'),

      '#weight' => 15,

      '#submit' => array('node_form_delete_submit'),

    );

  }

  // This form uses a button-level #submit handler for the form's main submit

  // action. node_form_submit() manually invokes all form-level #submit handlers

  // of the form. Without explicitly setting #submit, Form API would auto-detect

  // node_form_submit() as submit handler, but that is the button-level #submit

  // handler for the 'Save' action. To maintain backwards compatibility, a

  // #submit handler is auto-suggested for custom node type modules.

  $form['#validate'][] = 'node_form_validate';

  if (!isset($form['#submit']) && function_exists($node->type . '_node_form_submit')) {

    $form['#submit'][] = $node->type . '_node_form_submit';

  }

  $form += array('#submit' => array());

  field_attach_form('node', $node, $form, $form_state, entity_language('node', $node));

  return $form;

}

/**

 * Form submission handler for node_form().

 *

 * Handles the 'Delete' button on the node form.

 *

 * @see node_form()

 * @see node_form_validate()

 */

function node_form_delete_submit($form, &$form_state) {

  $destination = array();

  if (isset($_GET['destination'])) {

    $destination = drupal_get_destination();

    unset($_GET['destination']);

  }

  $node = $form['#node'];

  $form_state['redirect'] = array('node/' . $node->nid . '/delete', array('query' => $destination));

}

/**

 * Form submission handler for node_form().

 *

 * Handles the 'Preview' button on the node form.

 *

 * @see node_form()

 * @see node_form_validate()

 */

function node_form_build_preview($form, &$form_state) {

  $node = node_form_submit_build_node($form, $form_state);

  $form_state['node_preview'] = node_preview($node);

  $form_state['rebuild'] = TRUE;

}

/**

 * Generates a node preview.

 *

 * @param $node

 *   The node to preview.

 *

 * @return

 *   An HTML-formatted string of a node preview.

 *

 * @see node_form_build_preview()

 */

function node_preview($node) {

  // Clone the node before previewing it to prevent the node itself from being

  // modified.

  $cloned_node = clone $node;

  if (node_access('create', $cloned_node) || node_access('update', $cloned_node)) {

    _field_invoke_multiple('load', 'node', array($cloned_node->nid => $cloned_node));

    // Load the user's name when needed.

    if (isset($cloned_node->name)) {

      // The use of isset() is mandatory in the context of user IDs, because

      // user ID 0 denotes the anonymous user.

      if ($user = user_load_by_name($cloned_node->name)) {

        $cloned_node->uid = $user->uid;

        $cloned_node->picture = $user->picture;

      }

      else {

        $cloned_node->uid = 0; // anonymous user

      }

    }

    elseif ($cloned_node->uid) {

      $user = user_load($cloned_node->uid);

      $cloned_node->name = $user->name;

      $cloned_node->picture = $user->picture;

    }

    $cloned_node->changed = REQUEST_TIME;

    $nodes = array($cloned_node->nid => $cloned_node);

    // Display a preview of the node.

    if (!form_get_errors()) {

      $cloned_node->in_preview = TRUE;

      $output = theme('node_preview', array('node' => $cloned_node));

      unset($cloned_node->in_preview);

    }

    drupal_set_title(t('Preview'), PASS_THROUGH);

    return $output;

  }