<?php
/**
 * @file
 * Facebook-specific views arguments, filters, etc...
 */
function fb_views_views_api() {
  return array(
    'api' => 2,
    'path' => drupal_get_path('module', 'fb_views'),
  );
}

function fb_views_views_handlers() {
  $path = drupal_get_path('module', 'fb_views');
  return array(
    'handlers' => array(

      // fields
      'fb_views_handler_profile_pic' => array(
        'parent' => 'views_handler_field',
        'path' => $path,
      ),

      // filters
      'fb_views_handler_filter_friends' => array(
        'parent' => 'views_handler_filter_boolean_operator',
        'path' => $path,
      ),
      'fb_views_handler_filter_profile_tab' => array(
        'parent' => 'views_handler_filter_boolean_operator',
        'path' => $path,
      ),

      // arguments
      'fb_views_handler_author_is_friend' => array(
        'parent' => 'views_handler_argument_user_uid',
        'path' => $path,
      ),
    ),
  );
}

function fb_views_views_data() {
  // The fb_user_app table allows us to associate a node author's uid to a
  // facebook id.
  // Will be present if fb_user.module is used.
  // This might need to be improved to take the apikey into account (for sites that host more than one app.)
  $data['fb_user_app'] = array(
    'table' => array(
      'group' => t('Drupal for Facebook'),
      'join' => array(
        'node' => array(
          'left_field' => 'uid',
          'field' => 'uid',
        ),
        'users' => array(
          'left_field' => 'uid',
          'field' => 'uid',
        ),
      ),
    ),
    'picture' => array(
      'real field' => 'fbu',
      'title' => t('Picture'),
      'field' => array('handler' => 'fb_views_handler_profile_pic'),
      'help' => t('FBML to show a picture on Facebook Connect or Canvas pages.'),
    ),
    'fb_user_author' => array(
      'real field' => 'fbu',
      'title' => t('Author is friend'),
      'argument' => array('handler' => 'fb_views_handler_author_is_friend'),
      'help' => t('Limit results to Facebook friends of a user.'),
    ),
    'fb_views_filter_friends' => array(
      'real field' => 'fbu', // Does this do anything?
      'title' => t('Friend of current user'),
      'filter' => array('handler' => 'fb_views_handler_filter_friends'),
      'help' => t('Limit results to friends of the current user.  This filter will succeed when users are logged into Facebook Connect or Canvas pages.'),
    ),
  );

  // Authmap is the definitive link between a drupal account and facebook user id (fbu)
  $data['authmap'] = array(
    'table' => array(
      'group' => t('Drupal for Facebook'),
      'join' => array(
        'node' => array(
          'left_field' => 'uid',
          'field' => 'uid',
        ),
        'users' => array(
          'left_field' => 'uid',
          'field' => 'uid',
        ),
      ),
    ),
    'fb_views_filter_profile_tab' => array(
      'title' => t('Profile Tab Owner'),
      'filter' => array('handler' => 'fb_views_handler_filter_profile_tab'),
      'help' => t('Limit results to profile tab user.  Only works on Facebook Profile Tabs.'),
    ),
  );
  
  return $data;
}

// BIG TODO: the following views hooks are for views 1.  The style plugins are not yet converted to Views 2.


/**
 * Introduce a theme style that mimics a facebook discussion board.
 * 
 * To use: make a theme which provides a page view, and select view type
 * 'Facebook Discussion'.  Then under Fields, include Node: Title, Node:
 * Created Time, Node: Author Name, Comment: Count, Comment: Last Comment
 * Author, Comment: Last Comment Time.
 * 
 * It may not look exactly like a facebook discussion, but comes close.
 */
function fb_views_views_style_plugins() {
  $items = array();
  $items['fb_discussion'] = array(
    'name' => t('Facebook Discussion'),
    'theme' => 'views_fb_discussion',
    'summary_theme' => 'views_summary',
    'needs_table_header' => TRUE,
    'needs_fields' => TRUE, // without this, table header will not be built
  );
  $items['fb_teasers'] = array(
    'name' => t('Facebook Teaser List'),
    'theme' => 'views_fb_teasers',
    'summary_theme' => 'views_summary',
    'needs_table_header' => TRUE,
    'needs_fields' => TRUE, // without this, table header will not be built
  );
  return $items;
}

function theme_views_fb_discussion($view, $nodes, $type) {
  //drupal_set_message("theme_views_fb_discussion, type is '$type'" . print_r($view, 1) . dprint_r($nodes, 1));  // debug
  
  if ($type == 'page') {
    // use tablesort code to generate the sort links.
    $sorts = array();
    $ts = tablesort_init($view->table_header);
    foreach ($view->table_header as $cell) {
      $th = tablesort_header($cell, $view->table_header, $ts);
      $sorts[] = $th['data'];
    }
    $output .= theme('sortable_header_links', $sorts);
    
    $output .= theme('fb_discussion_nodes', $view, $nodes);
  }
  elseif ($type == 'block') {
    // If were displaying in a block, its most likely the profile page, where
    // all styles have to be inline.  So here we do our best to mimic the
    // block view of a facebook discussion.
    foreach ($nodes as $data) {
      $reply_count = format_plural($data->node_comment_statistics_comment_count+1, '1 post', '@count posts');

      $output .= '<div style="padding: 10px 20px 10px 5px; border-bottom: 1px solid #cccccc;">';
      $output .= '<div style="font-weight: bold; font-size: 10px;">' . l($data->node_title, 'node/' . $data->nid, array(), NULL, NULL, FALSE) . "</div><div style=\"font-size: 9px;\"><span style=\"color: #333333;\">$reply_count</span><span style=\"color: #888888; margin-left: 5px;\">Updated " . format_interval(time() - $data->node_comment_statistics_last_comment_timestamp) . " ago.</span></div>\n";
      $output .= "</div>\n";
    }
  }
  return $output;
}

function theme_sortable_header_links($items = array()) {
  if (!empty($items)) {
    $output .= "<ul class=\"links sortable_header_links\">";
    $output .= "<li class=\"first\">" . t('Sort by') . '</li>';
    foreach ($items as $item) {
      $output .= '<li>' . $item . '</li>';
    }
    $output .= "</ul>";
  }
  return $output;
}

function theme_fb_discussion_nodes($view, $items = array()) {
  $fields = _views_get_fields();
  if (!empty($items)) {
    foreach ($items as $item) {
      $out = array();
      $row = array();
      foreach ($view->field as $field) {
        if ($fields[$field['id']]['visible'] !== FALSE) {
          $out[$field['field']] = views_theme_field('views_handle_field', $field['queryname'], $fields, $field, $item, $view);
        }
      }

      $reply_count = format_plural($item->node_comment_statistics_comment_count + 1, '1 post', '@count posts');

      // Title link, reply count and created date
      $row[] = array(
        'class' => 'fb_discussion_topic',
        'data' => '<div class="title">' . $out['title'] . '</div>' .
        '<div class="info"><span class="post">' . $reply_count . '.</span>&nbsp;<span class="created">' .
        t('Created !time', array('!time' => $out['created'])) . '.</span></div>');
      // Most recent reply info
      $row[] = array(
        'class' => 'fb_discussion_reply',
        'data' => '<div class="author">'.
        t('Latest post by !name',
          array('!name' => $out['last_comment_name'])) .
        '</div><div class="timestamp">' . $out['last_comment_timestamp'] . '</div>');
      $rows[] = $row;
    }
    if (count($rows)) {
      $output = theme('table', array(), $rows,
                      array('class' => 'fb_discussion'));
    }
  }
  return $output;
}


function theme_views_fb_teasers($view, $nodes, $type) {
  //drupal_set_message("theme_views_fb_teasers, type is '$type'" . print_r($view, 1) . dprint_r($nodes, 1));  // debug

  // If were displaying in a block, its most likely the profile page, where
  // all styles have to be inline.  So here we do our best to mimic the
  // block view of a facebook discussion.
  foreach ($nodes as $data) {
    $node = node_load($data->nid);
    $output .= '<div style="padding: 10px 20px 10px 5px; border-bottom: 1px solid #cccccc;">';
    $output .= '<div style="font-weight: bold; font-size: 10px;">' .
      l($node->title, 'node/' . $data->nid, array(), NULL, NULL, FALSE) .
      "</div>";
    $node = node_build_content($node, TRUE, FALSE);
    $output .= drupal_render($node->content);
    $output .= "</div>\n";
  }
  return $output;
}