<?php

/**
 * Implements hook_facetapi_widgets().
 */
function facetapi_collapsible_facetapi_widgets() {
  return array(
    'collapsible' => array(
      'handler' => array(
        'label' => t('Collapsible Links'),
        'class' => 'FacetapiCollapsible',
        'query types' => array('term', 'date'),
      ),
    ),
  );
}

/**
 * Implements hook_theme_registry_alter().
 */
function facetapi_collapsible_theme_registry_alter(&$theme_registry) {
  // FacetAPI Collapsible only needs to inject or wrap these theming functions with additional markup.
  // When replacing the theme funciton, we need to save the origial array and invoke the original theming
  // function in ours. This allows compatibility with other modules and themes that have existing overrides.
  foreach (array('facetapi_title', 'facetapi_link_inactive', 'facetapi_link_active') as $theme_function) {
    $theme_registry['facetapi_collapsible_' . $theme_function . '_original'] = $theme_registry[$theme_function];
    $theme_registry[$theme_function]['function'] = 'facetapi_collapsible_' . $theme_function;
  }
}

/**
 * Implements theme_facetapi_link_title().
 */
function facetapi_collapsible_facetapi_title($variables) {
  return theme('facetapi_collapsible_facetapi_title_original', $variables) . '<span class="toggle"></span>';
}

/**
 * Implements theme_facetapi_link_inactive().
 */
function facetapi_collapsible_facetapi_link_inactive($variables) {
  return '<div class="facetapi-facet facetapi-inactive">'. theme('facetapi_collapsible_facetapi_link_inactive_original', $variables) .'</div>';
}

/**
 * Implements theme_facetapi_link_active().
 */
function facetapi_collapsible_facetapi_link_active($variables) {
  return '<div class="facetapi-facet facetapi-active">' . theme('facetapi_collapsible_facetapi_link_active_original', $variables) . '</div>';
}

/**
 * Implements hook_block_view_alter().
 */
function facetapi_collapsible_block_view_alter($data, $block) {
  if (isset($data['content']['#facet'])) {
    $settings = $data['content']['#settings'];
    if (is_object($settings) && isset($settings->settings) && $settings->settings['widget'] == 'collapsible') {
      facetapi_collapsible_static($block->delta);
    }
  }
}

/**
 * Function that manages a static array of the block deltas that contain
 * collapsible facets.
 */
function facetapi_collapsible_static($delta = NULL) {
  $facetapi_collapsible = &drupal_static(__FUNCTION__, array());
  if ($delta) {
    // Add the given delta to our array of collapsible facets.
    $facetapi_collapsible[] = $delta;
  }
  return $facetapi_collapsible;
}


/**
 * Implements hook_preprocess_block().
 */
function facetapi_collapsible_preprocess_block(&$variables) {
  $collapsible_facets = facetapi_collapsible_static();
  if (in_array($variables['block']->delta, $collapsible_facets)) {
    $variables['classes_array'][] = 'facetapi-collapsible';
  }
}