<?php
/**
 * Implementation of a document in the document management system
 *
 * @category   DMS
 * @package    SeedDMS_Core
 * @license    GPL2
 * @author     Markus Westphal, Malcolm Cowe, Matteo Lucarelli,
 *             Uwe Steinmann <uwe@steinmann.cx>
 * @copyright  Copyright (C) 2002-2005 Markus Westphal, 2006-2008 Malcolm Cowe,
 *             2010 Matteo Lucarelli, 2010 Uwe Steinmann
 * @version    Release: @package_version@
 */

/**
 * Class to represent a download link in the document management system
 *
 * Download links are access rights to a particular document version.
 *
 * @category   DMS
 * @package    SeedDMS_Core
 * @author     Uwe Steinmann <uwe@steinmann.cx>
 * @copyright  Copyright (C) 2016 Uwe Steinmann
 * @version    Release: @package_version@
 */
class SeedDMS_Core_DownloadLink { /* {{{ */
	/**
	 * @var integer unique id of object
	 */
	protected $_id;

	/**
	 * @var object document belonging to link
	 */
	protected $_document;

	/**
	 * @var integer version of document
	 */
	protected $_version;

	/**
	 * @var object user owning the document link
	 */
	protected $_user;

	/**
	 * @var string hash of document link
	 */
	protected $_hash;

	/**
	 * @var date date till links valid
	 */
	protected $_valid;

	/**
	 * @var object back reference to document management system
	 */
	public $_dms;

	function __construct($id, $document, $version, $user, $hash, $valid) { /* {{{ */
		$this->_id = $id;
		$this->_dms = null;
		$this->_document = $document;
		$this->_version = $version;
		$this->_user = $user;
		$this->_hash = $hash;
		$this->_valid = $valid;
	} /* }}} */

	private static function __getInstance($queryStr, $dms) { /* {{{ */
		$db = $dms->getDB();
		$resArr = $db->getResultArray($queryStr);
		if (is_bool($resArr) && $resArr == false)
			return false;
		if (count($resArr) != 1)
			return false;
		$resArr = $resArr[0];

		$document = $dms->getDocument($resArr['document']);
		$user = $dms->getUser($resArr['userID']);

		$classname = $dms->getClassname('downloadlink');
		$downloadlink = new $classname($resArr["id"], $document, $resArr["version"], $user, $resArr["hash"], $resArr["valid"]);
		$downloadlink->setDMS($dms);
		return $downloadlink;
	} /* }}} */

	private static function __getAllInstances($queryStr, $dms) { /* {{{ */
		$db = $dms->getDB();
		$resArr = $db->getResultArray($queryStr);
		if (is_bool($resArr) && $resArr == false)
			return false;

		$downloadlinks = array();
		foreach($resArr as $rec) {
			$document = $dms->getDocument($rec['document']);
			$user = $dms->getUser($rec['userID']);

			$classname = $dms->getClassname('downloadlink');
			$downloadlink = new $classname($rec["id"], $document, $rec["version"], $user, $rec["hash"], $rec["valid"]);
			$downloadlink->setDMS($dms);
			$downloadlinks[] = $downloadlink;
		}
		return $downloadlinks;
	} /* }}} */

	public static function getInstance($id, $dms) { /* {{{ */
		$queryStr = "SELECT * FROM `tblDownloadLinks` WHERE `id` = " . (int) $id;
		return self::__getInstance($queryStr, $dms);
	} /* }}} */

	public static function getInstanceByHash($hash, $dms) { /* {{{ */
		$queryStr = "SELECT * FROM `tblDownloadLinks` WHERE `hash` = " . $db->qstr($hash);
		return self::__getInstance($queryStr, $dms);
	} /* }}} */

	public static function getAllInstances($user, $version, $dms) { /* {{{ */
		$queryStr = "SELECT * FROM `tblDownloadLinks`";
		if($user || $version) {
			$queryStr .= " WHERE";
			if($user) {
				$queryStr .= " `userID` = " . (int) $user->getID();
				if($version) {
					$queryStr .= " AND `version` = " . (int) $version;
				}
			} else {
				$queryStr .= " `version` = " . (int) $version;
			}
		}
		return self::__getAllInstances($queryStr, $dms);
	} /* }}} */

	/*
	 * Set dms this object belongs to.
	 *
	 * Each object needs a reference to the dms it belongs to. It will be
	 * set when the object is created.
	 * The dms has a references to the currently logged in user
	 * and the database connection.
	 *
	 * @param object $dms reference to dms
	 */
	function setDMS($dms) { /* {{{ */
		$this->_dms = $dms;
	} /* }}} */

	/**
	 * Return owner of document link
	 *
	 * @return object owner of document link as an instance of {@link SeedDMS_Core_User}
	 */
	function getUser() { /* {{{ */
		return $this->_user;
	} /* }}} */

	/**
	 * Return hash of document link
	 *
	 * @return string hash of link
	 */
	function getHash() { /* {{{ */
		return $this->_hash;
	} /* }}} */

	/**
	 * Remove a download link
	 *
	 * @return boolean true on success, otherwise false
	 */
	function remove() { /* {{{ */
		$db = $this->_dms->getDB();

		$queryStr = "DELETE FROM `tblDownloadLinks` WHERE `id` = " . $this->_id;
		if (!$db->getResult($queryStr)) {
			return false;
		}

		return true;
	} /* }}} */

} /* }}} */