<?php

/**
 * @file
 * Main module file for override_node_options.
 *
 * Allow users to override the default publishing options for nodes they can
 * edit without giving them the 'administer nodes' permission.
 */

/**
 * Implements hook_permission().
 */
function override_node_options_permission() {
  // Global permissions which apply to all node types.
  $permissions = array(
    'administer override node options' => array(
      'title' => t('Administer override node options.'),
    ),
  );

  $show_perms = variable_get('override_node_options_permissions', array('general', 'specific'));
  if (in_array('general', $show_perms, TRUE)) {
    $permissions += array(
      'override all published option' => array(
        'title' => t('Override published option for all node types.'),
      ),
      'override all promote to front page option' => array(
        'title' => t('Override promote to front page option for all node types.'),
      ),
      'override all sticky option' => array(
        'title' => t('Override sticky option for all node types.'),
      ),
      'override all revision option' => array(
        'title' => t('Override revision option for all node types.'),
      ),
      'enter all revision log entry' => array(
        'title' => t('Enter revision log entry for all node types.'),
      ),
      'override all authored on option' => array(
        'title' => t('Override authored on option for all node types.'),
      ),
      'override all authored by option' => array(
        'title' => t('Override authored by option for all node types.'),
      ),
    );
    if (module_exists('comment')) {
      $permissions += array(
        'override all comment setting option' => array(
          'title' => t('Override comment setting option for all node types.'),
        ),
      );
    }
  }

  if (in_array('specific', $show_perms, TRUE)) {
    // Generate override node permissions for all applicable node types.
    foreach (node_permissions_get_configured_types() as $type) {
      $permissions += override_node_options_list_permissions($type);
    }
  }

  return $permissions;
}

/**
 * Helper function to generate override node permission list for a given type.
 *
 * @param string $type
 *   The machine-readable name of the node type.
 *
 * @return array
 *   An array of permission names and description.
 */
function override_node_options_list_permissions($type, $name = NULL) {
  if (!$name) {
    $name = node_type_get_name($type);
  }
  $type = check_plain($type);

  $permissions = array(
    "override $type published option" => array(
      'title' => t('Override %type_name published option.', array('%type_name' => $name)),
    ),
    "override $type promote to front page option" => array(
      'title' => t('Override %type_name promote to front page option.', array('%type_name' => $name)),
    ),
    "override $type sticky option" => array(
      'title' => t('Override %type_name sticky option.', array('%type_name' => $name)),
    ),
    "override $type revision option" => array(
      'title' => t('Override %type_name revision option.', array('%type_name' => $name)),
    ),
    "enter $type revision log entry" => array(
      'title' => t('Enter %type_name revision log entry.', array('%type_name' => $name)),
    ),
    "override $type authored on option" => array(
      'title' => t('Override %type_name authored on option.', array('%type_name' => $name)),
    ),
    "override $type authored by option" => array(
      'title' => t('Override %type_name authored by option.', array('%type_name' => $name)),
    ),
  );

  if (module_exists('comment')) {
    $permissions += array(
      "override $type comment setting option" => array(
        'title' => t('Override %type_name comment setting option.', array('%type_name' => $name)),
      ),
    );
  }

  return $permissions;
}

/**
 * Implements hook_menu().
 */
function override_node_options_menu() {
  $items['admin/config/content/override-node-options'] = array(
    'title' => 'Override Node Options Settings',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('override_node_options_settings_form'),
    'access arguments' => array('administer override node options'),
    'type' => MENU_NORMAL_ITEM,
  );

  return $items;
}

/**
 * Settings form.
 */
function override_node_options_settings_form($form, &$form_values) {
  $form = array();

  $form['override_node_options_permissions'] = array(
    '#type' => 'checkboxes',
    '#title' => t('Provide the following permissions:'),
    '#options' => array(
      'general' => t('General permissions, accross all node types'),
      'specific' => t('Specific permissions, for each individual node type'),
    ),
    '#default_value' => variable_get('override_node_options_permissions', array('general', 'specific')),
  );

  $form['#submit'][] = 'override_node_options_settings_form_submit';

  return system_settings_form($form);
}

/**
 * Submit handler for settings form.
 */
function override_node_options_settings_form_submit(&$form, &$form_state) {
  // Get old perms to compare.
  $old_perms = variable_get('override_node_options_permissions', array('general', 'specific'));
  $new_perms = $form_state['values']['override_node_options_permissions'];

  // Clean up saved permissions.
  $role_names = user_roles();
  $revoke = array();

  if (!in_array('specific', $new_perms, TRUE) && in_array('specific', $old_perms, TRUE)) {
    $alert = TRUE;
    $permissions = array();
    foreach (node_permissions_get_configured_types() as $type) {
      $permissions += override_node_options_list_permissions($type);
    }

    foreach ($permissions as $permission => $description) {
      $revoke[$permission] = FALSE;
    }

    // Be sure to clear the cache.
    cache_clear_all();
  }

  if (!in_array('general', $new_perms, TRUE) && in_array('general', $old_perms, TRUE)) {
    $alert = TRUE;
    $revoke = array(
      'override all published option' => FALSE,
      'override all promote to front page option' => FALSE,
      'override all sticky option' => FALSE,
      'override all revision option' => FALSE,
      'enter all revision log entry' => FALSE,
      'override all authored on option' => FALSE,
      'override all authored by option' => FALSE,
    );
    if (module_exists('comment')) {
      $revoke['override all comment setting option'] = FALSE;
    }
  }

  // Any specific grants not used anymore need to be deleted.
  if (!empty($revoke)) {
    foreach ($role_names as $rid => $name) {
      user_role_change_permissions($rid, $revoke);
    }
  }

  // Set a helpful message.
  $message = 'Configuration saved.';
  $arguments = array();
  $status = 'status';

  if ($alert) {
    if (user_access('administer permissions')) {
      $arguments = array('!permissions' => l(t('the permissions page'), 'admin/config/people/permissions', array('fragment' => 'module-override_node_options')));
      $message .= t(' Please visit !permissions and double check access.');
      $status = 'warning';
    }
    else {
      $message .= t(' Please visit the permissions page and double check access.');
    }
  }

  drupal_set_message(t($message, $arguments), $status);
}


/**
 * Implements hook_form_alter().
 */
function override_node_options_form_alter(&$form, &$form_state, $form_id) {
  if (!empty($form['#node_edit_form']) && !user_access('administer nodes')) {
    // Get a copy of the current node object.
    $node = $form['#node'];

    // Add access to the 'Revision information: log message' field.
    $form['revision_information']['log']['#access'] = user_access('enter ' . $node->type . ' revision log entry') || user_access('enter all revision log entry');

    // Add access to the 'Revision information' fieldset.
    $form['revision_information']['revision']['#access'] = user_access('override ' . $node->type . ' revision option') || user_access('override all revision option');
    $form['revision_information']['#access'] = element_get_visible_children($form['revision_information']);

    // Add access to the 'Authoring information' fieldset.
    $form['author']['name']['#access'] = user_access('override ' . $node->type . ' authored by option') || user_access('override all authored by option');
    $form['author']['date']['#access'] = user_access('override ' . $node->type . ' authored on option') || user_access('override all authored on option');
    if (array_key_exists('#access', $form['author'])) {
      $form['author']['#access'] |= element_get_visible_children($form['author']);
    }
    else {
      $form['author']['#access'] = element_get_visible_children($form['author']);
    }

    // Add access to the 'Publishing options' fieldset.
    $form['options']['status']['#access'] = user_access(sprintf('override %s published option', $node->type));
    $form['options']['promote']['#access'] = user_access(sprintf('override %s promote to front page option', $node->type));
    $form['options']['sticky']['#access'] = user_access(sprintf('override %s sticky option', $node->type));

    // If access is granted for promote or sticky, show (but disable) status.
    // This keeps core's JS working, and correctly populates the vertical tab.
    if ($form['options']['status']['#access'] == FALSE && ($form['options']['promote']['#access'] || $form['options']['sticky']['#access'])) {
      $form['options']['status']['#access'] = TRUE;
      $form['options']['status']['#disabled'] = TRUE;
    }

    $form['options']['status']['#access'] = user_access('override ' . $node->type . ' published option') || user_access('override all published option');
    $form['options']['promote']['#access'] = user_access('override ' . $node->type . ' promote to front page option') || user_access('override all promote to front page option');
    $form['options']['sticky']['#access'] = user_access('override ' . $node->type . ' sticky option') || user_access('override all sticky option');
    if (array_key_exists('#access', $form['options'])) {
      $form['options']['#access'] |= element_get_visible_children($form['options']);
    }
    else {
      $form['options']['#access'] = element_get_visible_children($form['options']);
    }

    // Add access to the 'Comment settings' fieldset.
    if (module_exists('comment') && isset($form['comment_settings'])) {
      $form['comment_settings']['#access'] |= user_access('override ' . $node->type . ' comment setting option') || user_access('override all comment setting option');
    }

    if (!empty($form['#node_edit_form']) && !user_access('administer nodes')) {
      $form['author']['#attached']['js'][1]['data']['anonymous'] = $form['author']['name']['#default_value'];
    }
  }
}