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//
// Find topic id if user requested a newer
// or older topic
//
if ( isset($HTTP_GET_VARS['view']) && empty($HTTP_GET_VARS[POST_POST_URL]) )
{
	if ( $HTTP_GET_VARS['view'] == 'newest' )
	{
		if ( isset($HTTP_COOKIE_VARS[$board_config['cookie_name'] . '_sid']) || isset($HTTP_GET_VARS['sid']) )
		{
			$session_id = isset($HTTP_COOKIE_VARS[$board_config['cookie_name'] . '_sid']) ? $HTTP_COOKIE_VARS[$board_config['cookie_name'] . '_sid'] : $HTTP_GET_VARS['sid'];

			if (!preg_match('/^[A-Za-z0-9]*$/', $session_id)) 
			{
				$session_id = '';
			}

			if ( $session_id )
			{
				$sql = "SELECT p.post_id
					FROM " . POSTS_TABLE . " p, " . SESSIONS_TABLE . " s,  " . USERS_TABLE . " u
					WHERE s.session_id = '$session_id'
						AND u.user_id = s.session_user_id
						AND p.topic_id = $topic_id
						AND p.post_time >= u.user_lastvisit
					ORDER BY p.post_time ASC
					LIMIT 1";
				if ( !($result = $db->sql_query($sql)) )
				{
					message_die(GENERAL_ERROR, 'Could not obtain newer/older topic information', '', __LINE__, __FILE__, $sql);
				}

				if ( !($row = $db->sql_fetchrow($result)) )
				{
					message_die(GENERAL_MESSAGE, 'No_new_posts_last_visit');
				}

				$post_id = $row['post_id'];

				if (isset($HTTP_GET_VARS['sid']))
				{
					redirect("viewtopic.$phpEx?sid=$session_id&" . POST_POST_URL . "=$post_id#$post_id");
				}
				else
				{
					redirect("viewtopic.$phpEx?" . POST_POST_URL . "=$post_id#$post_id");
				}
			}
		}

		redirect(append_sid("viewtopic.$phpEx?" . POST_TOPIC_URL . "=$topic_id", true));
	}
	else if ( $HTTP_GET_VARS['view'] == 'next' || $HTTP_GET_VARS['view'] == 'previous' )
	{
		$sql_condition = ( $HTTP_GET_VARS['view'] == 'next' ) ? '>' : '<';
		$sql_ordering = ( $HTTP_GET_VARS['view'] == 'next' ) ? 'ASC' : 'DESC';

		$sql = "SELECT t.topic_id
			FROM " . TOPICS_TABLE . " t, " . TOPICS_TABLE . " t2
			WHERE
				t2.topic_id = $topic_id
				AND t.forum_id = t2.forum_id
				AND t.topic_moved_id = 0
				AND t.topic_last_post_id $sql_condition t2.topic_last_post_id
			ORDER BY t.topic_last_post_id $sql_ordering
			LIMIT 1";
		if ( !($result = $db->sql_query($sql)) )
		{
			message_die(GENERAL_ERROR, "Could not obtain newer/older topic information", '', __LINE__, __FILE__, $sql);
		}

		if ( $row = $db->sql_fetchrow($result) )
		{
			$topic_id = intval($row['topic_id']);
		}
		else
		{
			$message = ( $HTTP_GET_VARS['view'] == 'next' ) ? 'No_newer_topics' : 'No_older_topics';
			message_die(GENERAL_MESSAGE, $message);
		}
	}
}