<?php

/**
 * @file TrackDirectorsDAO.inc.php
 *
 * Copyright (c) 2000-2008 John Willinsky
 * Distributed under the GNU GPL v2. For full terms see the file docs/COPYING.
 *
 * @package conference
 * @class TrackDirectorsDAO
 *
 * Class for DAO relating tracks to directors.
 *
 * $Id: TrackDirectorsDAO.inc.php,v 1.8 2008/04/04 17:06:45 asmecher Exp $
 */

class TrackDirectorsDAO extends DAO {
	/**
	 * Insert a new track director.
	 * @param $schedConfId int
	 * @param $trackId int
	 * @param $userId int
	 */
	function insertDirector($schedConfId, $trackId, $userId) {
		return $this->update(
			'INSERT INTO track_directors
				(sched_conf_id, track_id, user_id)
				VALUES
				(?, ?, ?)',
			array(
				$schedConfId,
				$trackId,
				$userId
			)
		);
	}

	/**
	 * Delete a track director.
	 * @param $schedConfId int
	 * @param $trackId int
	 * @param $userId int
	 */
	function deleteDirector($schedConfId, $trackId, $userId) {
		return $this->update(
			'DELETE FROM track_directors WHERE sched_conf_id = ? AND track_id = ? AND user_id = ?',
			array(
				$schedConfId,
				$trackId,
				$userId
			)
		);
	}

	/**
	 * Retrieve a list of tracks assigned to the specified user.
	 * @param $schedConfId int
	 * @param $userId int
	 * @return array matching Tracks
	 */
	function &getTracksByUserId($schedConfId, $userId) {
		$tracks = array();

		$trackDao = &DAORegistry::getDAO('TrackDAO');

		$result = &$this->retrieve(
			'SELECT t.* FROM tracks t, track_directors td WHERE t.track_id = td.track_id AND t.sched_conf_id = ? AND td.user_id = ?',
			array($schedConfId, $userId)
		);

		while (!$result->EOF) {
			$tracks[] = &$trackDao->_returnTrackFromRow($result->GetRowAssoc(false));
			$result->moveNext();
		}

		$result->Close();
		unset($result);

		return $tracks;
	}

	/**
	 * Retrieve a list of all track directors assigned to the specified track.
	 * @param $schedConfId int
	 * @param $trackId int
	 * @return array matching Users
	 */
	function &getDirectorsByTrackId($schedConfId, $trackId) {
		$users = array();

		$userDao = &DAORegistry::getDAO('UserDAO');

		$result = &$this->retrieve(
			'SELECT u.* FROM users AS u, track_directors AS e WHERE u.user_id = e.user_id AND e.sched_conf_id = ? AND e.track_id = ? ORDER BY last_name, first_name',
			array($schedConfId, $trackId)
		);

		while (!$result->EOF) {
			$users[] = &$userDao->_returnUserFromRow($result->GetRowAssoc(false));
			$result->moveNext();
		}

		$result->Close();
		unset($result);

		return $users;
	}

	/**
	 * Retrieve a list of all track directors not assigned to the specified track.
	 * @param $schedConfId int
	 * @param $trackId int
	 * @return array matching Users
	 */
	function &getDirectorsNotInTrack($schedConfId, $trackId) {
		$users = array();

		$userDao = &DAORegistry::getDAO('UserDAO');

		$result = &$this->retrieve(
			'SELECT	u.*
			FROM	users u
				LEFT JOIN roles r ON (r.user_id = u.user_id)
				LEFT JOIN track_directors e ON (e.user_id = u.user_id AND e.sched_conf_id = r.sched_conf_id AND e.track_id = ?)
			WHERE	r.sched_conf_id = ? AND
				r.role_id = ? AND
				e.track_id IS NULL
			ORDER BY last_name, first_name',
			array($trackId, $schedConfId, ROLE_ID_TRACK_DIRECTOR)
		);

		while (!$result->EOF) {
			$users[] = &$userDao->_returnUserFromRow($result->GetRowAssoc(false));
			$result->moveNext();
		}

		$result->Close();
		unset($result);

		return $users;
	}

	/**
	 * Delete all track directors for a specified track in a scheduled conference.
	 * @param $trackId int
	 * @param $schedConfId int
	 */
	function deleteDirectorsByTrackId($trackId, $schedConfId = null) {
		if (isset($schedConfId)) return $this->update(
			'DELETE FROM track_directors WHERE sched_conf_id = ? AND track_id = ?',
			array($schedConfId, $trackId)
		);
		else return $this->update(
			'DELETE FROM track_directors WHERE track_id = ?',
			$trackId
		);
	}

	/**
	 * Delete all track directors for a specified scheduled conference.
	 * @param $schedConfId int
	 */
	function deleteDirectorsBySchedConfId($schedConfId) {
		return $this->update(
			'DELETE FROM track_directors WHERE sched_conf_id = ?', $schedConfId
		);
	}

	/**
	 * Delete all track assignments for the specified user.
	 * @param $userId int
	 * @param $schedConfId int optional, include assignments only in this scheduled conference
	 * @param $trackId int optional, include only this track
	 */
	function deleteDirectorsByUserId($userId, $schedConfId  = null, $trackId = null) {
		return $this->update(
			'DELETE FROM track_directors WHERE user_id = ?' . (isset($schedConfId) ? ' AND sched_conf_id = ?' : '') . (isset($trackId) ? ' AND track_id = ?' : ''),
			isset($schedConfId) && isset($trackId) ? array($userId, $schedConfId, $trackId)
			: (isset($schedConfId) ? array($userId, $schedConfId)
			: (isset($trackId) ? array($userId, $trackId) : $userId))
		);
	}

	/**
	 * Check if a user is assigned to a specified track.
	 * @param $schedConfId int
	 * @param $trackId int
	 * @param $userId int
	 * @return boolean
	 */
	function directorExists($schedConfId, $trackId, $userId) {
		$result = &$this->retrieve(
			'SELECT COUNT(*) FROM track_directors WHERE sched_conf_id = ? AND track_id = ? AND user_id = ?', array($schedConfId, $trackId, $userId)
		);
		$returner = isset($result->fields[0]) && $result->fields[0] == 1 ? true : false;

		$result->Close();
		unset($result);

		return $returner;
	}
}

?>