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<?php
/*
 * Laconica - a distributed open-source microblogging tool
 * Copyright (C) 2008, Controlez-Vous, Inc.
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

if (!defined('LACONICA')) { exit(1); }

class SupAction extends Action {
	
	function handle($args) {
		
		parent::handle($args);
		
		$seconds = $this->trimmed('seconds');
		
		if (!$seconds) {
			$seconds = 15;
		}

		$updates = $this->get_updates($seconds);
		
		header('Content-Type: application/json; charset=utf-8');
		
		print json_encode(array('updated_time' => date('c'),
								'since_time' => date('c', time() - $seconds),
								'available_periods' => $this->available_periods(),
								'period' => $seconds,
								'updates' => $updates));
	}
	
	function available_periods() {
		static $periods = array(86400, 43200, 21600, 7200,
								3600, 1800,	600, 300, 120,
								60, 30, 15); 
		$available = array();
		foreach ($periods as $period) {
			$available[$period] = common_local_url('sup',
												   array('seconds' => $period));
		}
		
		return $available;
	}
	
	function get_updates($seconds) {
		$notice = new Notice();

		# XXX: cache this. Depends on how big this protocol becomes;
		# Re-doing this query every 15 seconds isn't the end of the world.

		$notice->query('SELECT profile_id, max(id) AS max_id ' .
					   'FROM notice ' .
					   'WHERE created > (now() - ' . $seconds . ') ' .
					   'GROUP BY profile_id');
		
		$updates = array();
		
		while ($notice->fetch()) {
			$updates[] = array($notice->profile_id, $notice->max_id);
		}
		
		return $updates;
	}
	
	function is_readonly() {
		return true;
	}
}