<?php

/**
 * @file
 * Provides Skinr integration with Panels.
 *
 * NOTE: When panels are stored in code, rather than DB, we run into lack of
 *   context problems. See the below link for a workaround. This is a limitation
 *   with the Panels module.
 *
 * @link http://drupal.org/node/1160924 Undefined property: stdClass::$did in panels_skinr_preprocess_index_handler() @endlink
 * @link http://drupal.org/node/1292662 Workaround for undefined property: stdClass::$did in panels_skinr_preprocess_index_handler() @endlink
 */

/**
 * Implements hook_skinr_api().
 */
function skinr_panels_skinr_api_2() {
  return array();
}

/**
 * Implements hook_theme_registry_alter().
 *
 * Re-order preprocess functions to prioritize skinr_ui_preprocess, which adds
 * contextual links, over template_preprocess_HOOK functions. This fixes a
 * problem with the way panels handles contextual links.
 */
function skinr_panels_theme_registry_alter(&$theme_registry) {
  $preprocess_functions = array();
  foreach ($theme_registry['panels_pane']['preprocess functions'] as $function) {
    if ($function == 'skinr_ui_preprocess' || $function == 'skinr_panels_preprocess') {
      continue;
    }

    $preprocess_functions[] = $function;

    if ($function == 'template_preprocess') {
      // Insert our preprocess function right after template_preprocess to give it priority over template_preprocess_HOOK functions.
      $preprocess_functions[] = 'skinr_panels_preprocess';
      $preprocess_functions[] = 'skinr_ui_preprocess';
    }
  }
  $theme_registry['panels_pane']['preprocess functions'] = $preprocess_functions;

  // Add a preprocess function to theme_links(). This is a total hack.
  $theme_registry['links']['preprocess functions'][] = 'skinr_panels_preprocess_links';
}

/**
 * Implements hook_preprocess().
 */
function skinr_panels_preprocess(&$variables, $hook) {
  if ($hook == 'panels_pane' && user_access('edit skin settings')) {

    // Get contextual links.
    $contextual_links = array();
    $counter = 0;
    $array_elements = skinr_invoke_all('skinr_elements', $variables, $hook, 'contextual_links');
    $module = 'panels';
    $elements = $array_elements[$module];

    foreach ($elements as $element) {
      $contextual_links['skinr-' .  $module . '-' . $counter++] = array(
        'admin/structure/skinr/edit/nojs', array($module, $element),
      );
    }
    if (!empty($contextual_links)) {
      // Need to set contextual links through  Skinr API so we have a valid, and
      // consistent, link title. It's also used in our hook_preprocess_links()
      // hack.
      _skinr_ui_set_contextual_links($hook, $contextual_links);

      // Render links.
      $element = array(
        '#type' => 'contextual_links',
        '#contextual_links' => $contextual_links,
      );
      $element = contextual_pre_render_links($element);

      // Add in the Skinr links.
      if (isset($variables['content']->admin_links) && is_array($variables['content']->admin_links)) {
        $variables['content']->admin_links += $element['#links'];
      }
      else {
        $variables['content']->admin_links = $element['#links'];
      }
    }
  }
}

/**
 * Implements hook_preprocess_links().
 *
 * This hack is panels on panel pages only.
 */
function skinr_panels_preprocess_links(&$variables, $hook) {
  if (isset($variables['links'][0]['title']) && $variables['links'][0]['title'] == t('Edit @type', array('@type' => 'Panel')) && user_access('edit skin settings')) {
    // Get contextual links.
    $contextual_links = skinr_ui_get_contextual_links();
    if (isset($contextual_links['panels_pane'])) {
      $contextual_links = $contextual_links['panels_pane'];

      // Render links.
      $element = array(
        '#type' => 'contextual_links',
        '#contextual_links' => $contextual_links,
      );
      $element = contextual_pre_render_links($element);

      // Hack in the Skinr links.
      $variables['links'] += $element['#links'];
    }
  }
}