<?php
// $Id$

/**
 * @file
 * Enables tracking of recent posts for users.
 */

/**
 * Implementation of hook_help().
 */
function tracker_help($section) {
  switch ($section) {
    case 'admin/help#tracker':
      return t('<p>The tracker module is a handy module for displaying the most recent posts.  By following the <em>recent posts</em> link in the user block, a user may quickly review all recent postings.</p>');
    case 'admin/modules#description':
      return t('Enables tracking of recent posts for users.');
  }
}

/**
 * Implementation of hook_menu().
 */
function tracker_menu($may_cache) {
  global $user;
  $items = array();

  if ($may_cache) {
    $items[] = array('path' => 'tracker', 'title' => t('recent posts'),
      'callback' => 'tracker_page', 'access' => user_access('access content'),
      'weight' => 1);

    if ($user->uid) {
      $items[] = array('path' => 'tracker/all', 'title' => t('all recent posts'),
        'type' => MENU_DEFAULT_LOCAL_TASK);
      $items[] = array('path' => 'tracker/'. $user->uid, 'title' => t('my recent posts'),
        'type' => MENU_LOCAL_TASK);
    }
  }
  else {
    if (arg(0) == 'user' && is_numeric(arg(1))) {
      $items[] = array('path' => 'user/'. arg(1) .'/track', 'title' => t('track'),
          'callback' => 'tracker_track_user', 'access' => user_access('access content'),
          'type' => MENU_LOCAL_TASK);
    }
  }

  return $items;
}

/**
 * Menu callback. Prints a listing of active nodes on the site.
 */
function tracker_track_user() {
  tracker_page(arg(1));
}

/**
 * Menu callback. Prints a listing of active nodes on the site.
 */
function tracker_page($uid = 0) {
  global $user;

  $output .= '';

  if ($uid) {
    $result = pager_query('SELECT DISTINCT(n.nid), n.title, n.type, n.changed, n.uid, u.name, MAX(GREATEST(n.changed, c.timestamp)) AS last_post FROM {node} n '. node_access_join_sql() .' LEFT JOIN {comments} c ON n.nid = c.nid INNER JOIN {users} u ON n.uid = u.uid WHERE n.status = 1 AND '. node_access_where_sql() .' AND (n.uid = %d OR c.uid = %d) GROUP BY n.nid, n.title, n.type, n.changed, n.uid, u.name ORDER BY last_post DESC', 25, 0, 'SELECT COUNT(DISTINCT(n.nid)) FROM {node} n '. node_access_join_sql() .' LEFT JOIN {comments} c ON n.nid = c.nid WHERE n.status = 1 AND '. node_access_where_sql() .' AND (n.uid = %d OR c.uid = %d)', $uid, $uid);
  }
  else {
    $result = pager_query('SELECT DISTINCT(n.nid), n.title, n.type, n.changed, n.uid, u.name, MAX(GREATEST(n.changed, c.timestamp)) AS last_post FROM {node} n '. node_access_join_sql() .' LEFT JOIN {comments} c ON n.nid = c.nid INNER JOIN {users} u ON n.uid = u.uid WHERE n.status = 1 AND '. node_access_where_sql() .' GROUP BY n.nid, n.title, n.type, n.changed, n.uid, u.name ORDER BY last_post DESC', 25, 0, 'SELECT COUNT(DISTINCT(n.nid)) FROM {node} n '. node_access_join_sql() .' WHERE n.status = 1 AND '. node_access_where_sql());
  }

  while ($node = db_fetch_object($result)) {
    // Determine the number of comments:
    $comments = 0;
    if (module_exist('comment') && $all = comment_num_all($node->nid)) {
      $comments = $all;

      if ($new = comment_num_new($node->nid)) {
        $comments .= '<br />';
        $comments .= l(t('%num new', array('%num' => $new)), "node/$node->nid", NULL, NULL, 'new');
      }
    }

    $rows[] = array(
      node_invoke($node->type, 'node_name'),
      l($node->title, "node/$node->nid") .' '. (node_is_new($node->nid, $node->changed) ? theme('mark') : ''),
      format_name($node),
      array('class' => 'replies', 'data' => $comments),
      format_interval(time() - $node->last_post) .' '. t('ago')
    );
  }

  if ($pager = theme('pager', NULL, 25, 0)) {
   $rows[] = array(array('data' => $pager, 'colspan' => 5));
  }

  $header = array(t('Type'), t('Post'), t('Author'), t('Replies'), t('Last post'));

  $output .= '<div id="tracker">';
  $output .= theme('table', $header, $rows);
  $output .= '</div>';

  print theme('page', $output);
}

?>