<?php
/**
 * @file
 * Provide custom breadcrumbs for views pages.
 */
module_load_include('inc', 'custom_breadcrumbs', 'custom_breadcrumbs.admin');
module_load_include('inc', 'custom_breadcrumbs', 'custom_breadcrumbs_common');

/**
 * Implements hook_cb_breadcrumb_info().
 *
 * @return an array with elements:
 *   'table' indicating the db_table to load the breadcrumb from,
 *   'field' a unique field of the database table used to identify the breadcrumb,
 *   'type' a string used for indicating the breadcrumb type on the admin list,
 *   'name_constructor' a function which generates the breadcrumb name from the breadcrumb.
 */
function custom_breadcrumbs_views_cb_breadcrumb_info() {
  $breadcrumb_type_info = array();
  $breadcrumb_type_info['views'] = array(
    'table' => 'custom_breadcrumbs_views',
    'field' => 'views_path',
    'type' => 'views',
    'name_constructor' => '_custom_breadcrumbs_views_breadcrumb_name',
  );
  return $breadcrumb_type_info;
}

/**
 * Constructs a default name to display in the admin screen.
 *
 * @param $breadcrumb
 *   The breadcrumb object.
 *
 * @return
 *   A text string that will be used as the breadcrumb name.
 */
function _custom_breadcrumbs_views_breadcrumb_name($breadcrumb) {
  if (isset($breadcrumb->views_path)) {
    return $breadcrumb->views_path;
  }
}

/**
 * Implements hook_menu().
 */
function custom_breadcrumbs_views_menu() {
  $items = array();

  $items['admin/structure/custom_breadcrumbs/views/add'] = array(
    'title' => 'Views',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('custom_breadcrumbs_views_form', 'views'),
    'access callback' => 'user_access',
    'access arguments' => array('administer custom breadcrumbs'),
    'type' => MENU_LOCAL_TASK,
    'weight' => 5,
  );

  $items['admin/structure/custom_breadcrumbs/views/edit'] = array(
    'title' => 'Edit custom breadcrumb for views',
    'page callback' => 'drupal_get_form',
    'page arguments' => array('custom_breadcrumbs_views_form', 'views'),
    'access callback' => 'user_access',
    'access arguments' => array('administer custom breadcrumbs'),
    'type' => MENU_CALLBACK,
  );
  return $items;
}

/**
 * Implements hook_views_pre_render().
 */
function custom_breadcrumbs_views_views_pre_render(&$view) {
  // Don't really do anything with the view. This is just a pretense to insert a breadcrumb.
  global $language;
  $languages = array(
    'language' => $language->language,
    'all' => '',
  );

  $curpath = drupal_get_normal_path($_GET['q']);
  // Check to see if the view path matches the current path.
  foreach ($view->display as $id => $display) {
    // Identify allowed displays for breadcrumb replacement.
    if (!_custom_breadcrumbs_allowed_display($display)) {
      continue;
    }
    $viewpath = _custom_breadcrumbs_construct_view_path($display);
    if (_custom_breadcrumbs_match_path($curpath, $viewpath)) {
      $loadpath = $display->display_options['path'];
      $breadcrumbs = custom_breadcrumbs_load_breadcrumbs('custom_breadcrumbs_views', NULL, array('views_path' => $loadpath), $languages);
      if (!empty($breadcrumbs)) {
        if ($breadcrumb = custom_breadcrumbs_select_breadcrumb($breadcrumbs, array('view' => $view))) {
          // Select breadcrumb for the matching display with the greatest number of explicit arguments.
          $num = substr_count($breadcrumb->views_path, '%');
          if (!isset($max) || (isset($max) && ($num > $max))) {
            $max = $num;
            $candidate = $breadcrumb;
            $max_id = $id;
          }
        }
      }
    }
  }
  if (isset($candidate)) {
    $objs = _custom_breadcrumbs_views_token_types($view->display[$max_id]);
    $objs['view'] = $view;
    if (!isset($objs['node']) && isset($view->result[0]->nid)) {
      $node = node_load($view->result[0]->nid);
      $objs['node'] = $node;
    }
    custom_breadcrumbs_set_breadcrumb($candidate, $objs);
    return;
  }
  if (variable_get('custom_breadcrumbs_set_menu_breadcrumb', FALSE) && (!custom_breadcrumbs_exclude_path())) {
    // If a views breadcrumb has not been defined for this view, then use the default menu structure.
    custom_breadcrumbs_set_menu_breadcrumb();
  }
}

/**
 * Form builder; Displays an edit form for a views breadcrumb.
 *
 * @param $type
 *   The type of custom breadcrumb to edit.
 *
 * @ingroup forms
 * @see custom_breadcrumbs_form_validate()
 * @see custom_breadcrumbs_form_submit()
 */
function custom_breadcrumbs_views_form($form, &$form_state, $type) {
  $form = array();
  $breadcrumb = NULL;
  $bid = arg(5);
  if (isset($bid)) {
    drupal_set_title(t('Edit Custom Breadcrumb for View'));
    $breadcrumbs = custom_breadcrumbs_load_breadcrumbs('custom_breadcrumbs_views', NULL, array('bid' => $bid));
    $breadcrumb = array_pop($breadcrumbs);
  }
  else {
    drupal_set_title(t('Add Custom Breadcrumb for View'));
  }
  $options = array();
  $views =  views_get_all_views();
  foreach ($views as $view) {
    if (!isset($view->disabled) || (isset($view->disabled) && !$view->disabled)) {
      foreach ($view->display as $display) {
        if (_custom_breadcrumbs_allowed_display($display)) {
          $name = $display->display_options['path'];
          $options[$name] = $name;
        }
      }
    }
  }
  $form['views_path'] = array(
    '#type' => 'select',
    '#title' => t('Views Path'),
    '#required' => TRUE,
    '#options' => $options,
    '#description' => t('The path to the view that this custom breadcrumb trail will apply to.'),
    '#default_value' => isset($breadcrumb->views_path) ? $breadcrumb->views_path : NULL,
    '#weight' => -10,
  );
  // Store information needed to save this breadcrumb.
  $form['#module'] = 'custom_breadcrumbs_views';
  $form['#infokey'] = 'views';
  $form += custom_breadcrumbs_common_form_elements($bid, $breadcrumb);
  $form['visibility_php']['#description'] = t('Determine whether this breadcrumb should be displayed by using a PHP snippet to return TRUE or FALSE. Do not use opening and closing php tags.');
  $form['#submit'][] = 'custom_breadcrumbs_form_submit';
  $form['#validate'][] = 'custom_breadcrumbs_form_validate';

  return $form;
}