<?php
/* For licensing terms, see /license.txt */

/**
 * Dropbox module for Chamilo
 * Classes for the dropbox module.
 *
 * 3 classes have been defined:
 * - Dropbox_Work:
 * 		. id
 * 		. uploader_id	=> who sent it
 * 		. uploaderName
 * 		. filename		=> name of file stored on the server
 * 		. filesize
 * 		. title			=> name of file returned to user. This is the original name of the file
 * 							except when the original name contained spaces. In that case the spaces
 * 							will be replaced by _
 * 		. description
 * 		. author
 * 		. upload_date	=> date when file was first sent
 * 		. last_upload_date => date when file was last sent
 *  	. isOldWork 	=> has the work already been uploaded before
 *
 *      . feedback_date  => date of most recent feedback
 *      . feedback      => feedback text (or HTML?)
 *
 * - Dropbox_SentWork extends Dropbox_Work
 * 		. recipients	=> array of ["id"]["name"] lists the recipients of the work
 *
 * - Dropbox_Person:
 * 		. userId
 * 		. receivedWork 	=> array of Dropbox_Work objects
 * 		. sentWork 		=> array of Dropbox_SentWork objects
 * 		. isCourseTutor
 * 		. isCourseAdmin
 * 		. _orderBy		=> private property used for determining the field by which the works have to be ordered
 *
 * @version 1.30
 * @copyright 2004
 * @author Jan Bols <jan@ivpv.UGent.be>
 * with contributions by René Haentjens <rene.haentjens@UGent.be>
 * @package chamilo.dropbox
 */
class Dropbox_Work
{
    public $id;
    public $uploader_id;
    public $uploaderName;
    public $filename;
    public $filesize;
    public $title;
    public $description;
    public $author;
    public $upload_date;
    public $last_upload_date;
    public $isOldWork;
    public $feedback_date, $feedback;

    /**
     * Constructor calls private functions to create a new work or retreive an existing work from DB
     * depending on the number of parameters
     *
     * @param unknown_type $arg1
     * @param unknown_type $arg2
     * @param unknown_type $arg3
     * @param unknown_type $arg4
     * @param unknown_type $arg5
     * @param unknown_type $arg6
     * @return Dropbox_Work
     */
    public function Dropbox_Work($arg1, $arg2 = null, $arg3 = null, $arg4 = null, $arg5 = null, $arg6 = null)
    {
        if (func_num_args() > 1) {
            $this->_createNewWork($arg1, $arg2, $arg3, $arg4, $arg5, $arg6);
        } else {
            $this->_createExistingWork($arg1);
        }
    }

	/**
	 * private function creating a new work object
	 *
	 * @param int $uploader_id
	 * @param string $title
	 * @param string $description
	 * @param string $author
	 * @param string $filename
	 * @param int $filesize
	 *
	 * @todo 	$author was originally a field but this has now been replaced by the first and lastname of the uploader (to prevent anonymous uploads)
	 * 			As a consequence this parameter can be removed
	 */
	public function _createNewWork($uploader_id, $title, $description, $author, $filename, $filesize)
    {
        $_user = api_get_user_info();
        $dropbox_cnf = getDropboxConf();

        // Fill in the properties
        $this->uploader_id = intval($uploader_id);
        $this->uploaderName = getUserNameFromId($this->uploader_id);
        $this->filename = $filename;
        $this->filesize = $filesize;
        $this->title = $title;
        $this->description = $description;
        $this->author = api_get_person_name($_user['firstName'], $_user['lastName']);
        $this->last_upload_date = api_get_utc_datetime();
        $course_id = api_get_course_int_id();

        // Check if object exists already. If it does, the old object is used
        // with updated information (authors, description, upload_date)
        $this->isOldWork = false;
		$sql = "SELECT id, upload_date FROM ".$dropbox_cnf['tbl_file']."
				WHERE c_id = $course_id AND filename = '".Database::escape_string($this->filename)."'";
        $result = Database::query($sql);
		$res = Database::fetch_array($result);
		if ($res) {
			$this->isOldWork = true;
		}
		// Insert or update the dropbox_file table and set the id property
		if ($this->isOldWork) {
			$this->id = $res['id'];
			$this->upload_date = $res['upload_date'];
		    $sql = "UPDATE ".$dropbox_cnf["tbl_file"]." SET
					filesize			= '".Database::escape_string($this->filesize)."' ,
					title 				= '".Database::escape_string($this->title)."',
					description 		= '".Database::escape_string($this->description)."',
					author 				= '".Database::escape_string($this->author)."',
					last_upload_date 	= '".Database::escape_string($this->last_upload_date)."'
					WHERE c_id = $course_id AND id='".Database::escape_string($this->id)."'";
			Database::query($sql);
		} else {
			$this->upload_date = $this->last_upload_date;
			$sql = "INSERT INTO ".$dropbox_cnf['tbl_file']." (c_id, uploader_id, filename, filesize, title, description, author, upload_date, last_upload_date, session_id)
				VALUES ( $course_id,
						'".Database::escape_string($this->uploader_id)."'
						, '".Database::escape_string($this->filename)."'
						, '".Database::escape_string($this->filesize)."'
						, '".Database::escape_string($this->title)."'
						, '".Database::escape_string($this->description)."'
						, '".Database::escape_string($this->author)."'
						, '".Database::escape_string($this->upload_date)."'
						, '".Database::escape_string($this->last_upload_date)."'
						, ".api_get_session_id()."
						)";

        	Database::query($sql);
			$this->id = Database::insert_id(); // Get automatically inserted id
		}

        $sql = "SELECT count(file_id) as count FROM ".$dropbox_cnf['tbl_person']."
				WHERE c_id = $course_id AND file_id = '".Database::escape_string($this->id)."' AND user_id = ".$this->uploader_id;
        $result = Database::query($sql);
        $row = Database::fetch_array($result);
        if ($row['count'] == 0) {

            // Insert entries into person table
            $sql = "INSERT INTO ".$dropbox_cnf['tbl_person']." (c_id, file_id, user_id)
                    VALUES ($course_id,
                            '".Database::escape_string($this->id)."'
                            , '".Database::escape_string($this->uploader_id)."'
                            )";
            Database::query($sql);
        }
	}

	/**
	 * private function creating existing object by retreiving info from db
	 *
	 * @param int $id
	 */
	public function _createExistingWork($id)
    {
	    $course_id = api_get_course_int_id();
        $dropbox_cnf = getDropboxConf();

        $action = isset($_GET['action']) ? $_GET['action'] : null;

		// Do some sanity checks
		$id	= intval($id);

		// Get the data from DB
		$sql = "SELECT uploader_id, filename, filesize, title, description, author, upload_date, last_upload_date, cat_id
				FROM ".$dropbox_cnf['tbl_file']."
				WHERE c_id = $course_id AND id = '".Database::escape_string($id)."'";
        $result = Database::query($sql);
		$res = Database::fetch_array($result, 'ASSOC');

		// Check if uploader is still in Chamilo system
		$uploader_id = stripslashes($res['uploader_id']);
		$uploaderName = getUserNameFromId($uploader_id);
		if (!$uploaderName) {
			//deleted user
			$this->uploader_id = -1;
			$this->uploaderName = get_lang('Unknown', '');
		} else {
			$this->uploader_id = $uploader_id;
			$this->uploaderName = $uploaderName;
		}

		// Fill in properties
		$this->id = $id;
		$this->filename = stripslashes($res['filename']);
		$this->filesize = stripslashes($res['filesize']);
		$this->title = stripslashes($res['title']);
		$this->description = stripslashes($res['description']);
		$this->author = stripslashes($res['author']);
		$this->upload_date = stripslashes($res['upload_date']);
		$this->last_upload_date = stripslashes($res['last_upload_date']);
		$this->category = $res['cat_id'];

		// Getting the feedback on the work.
		if ($action == 'viewfeedback' AND $this->id == $_GET['id']) {
			$feedback2 = array();
			$sql_feedback = "SELECT * FROM ".$dropbox_cnf['tbl_feedback']." WHERE c_id = $course_id AND file_id='".$id."' ORDER BY feedback_id ASC";
			$result = Database::query($sql_feedback);
			while ($row_feedback = Database::fetch_array($result)) {
				$row_feedback['feedback'] = Security::remove_XSS($row_feedback['feedback']);
				$feedback2[] = $row_feedback;
			}
			$this->feedback2= $feedback2;
		}
	}
}

class Dropbox_SentWork extends Dropbox_Work
{
	public $recipients;	//array of ['id']['name'] arrays

	/**
	 * Constructor calls private functions to create a new work or retreive an existing work from DB
	 * depending on the number of parameters
	 *
	 * @param unknown_type $arg1
	 * @param unknown_type $arg2
	 * @param unknown_type $arg3
	 * @param unknown_type $arg4
	 * @param unknown_type $arg5
	 * @param unknown_type $arg6
	 * @param unknown_type $arg7
	 * @return Dropbox_SentWork
	 */
	function Dropbox_SentWork($arg1, $arg2 = null, $arg3 = null, $arg4 = null, $arg5 = null, $arg6 = null, $arg7 = null)
    {
		if (func_num_args() > 1) {
		    $this->_createNewSentWork($arg1, $arg2, $arg3, $arg4, $arg5, $arg6, $arg7);
		} else {
			$this->_createExistingSentWork($arg1);
		}
	}

	/**
	 * private function creating a new SentWork object
	 *
	 * @param int $uploader_id
	 * @param string $title
	 * @param string $description
	 * @param string $author
	 * @param string $filename
	 * @param int $filesize
	 * @param array $recipient_ids
	 */
	public function _createNewSentWork($uploader_id, $title, $description, $author, $filename, $filesize, $recipient_ids)
    {
        $dropbox_cnf = getDropboxConf();
        $_course = api_get_course_info();

		// Call constructor of Dropbox_Work object
		$this->Dropbox_Work($uploader_id, $title, $description, $author, $filename, $filesize);

		$course_id = api_get_course_int_id();

		// Do sanity checks on recipient_ids array & property fillin
		// The sanity check for ex-coursemembers is already done in base constructor
		settype($uploader_id, 'integer') or die(get_lang('GeneralError').' (code 208)'); // Set $uploader_id to correct type

		$justSubmit = false;
		if ( is_int($recipient_ids)) {
			$justSubmit = true;
			$recipient_ids = array($recipient_ids + $this->id);
		} elseif ( count($recipient_ids) == 0) {
			$justSubmit = true;
			$recipient_ids = array($uploader_id);
		}

		if (! is_array($recipient_ids) || count($recipient_ids) == 0) {
			die(get_lang('GeneralError').' (code 209)');
		}

		foreach ($recipient_ids as $rec) {
			if (empty($rec)) die(get_lang('GeneralError').' (code 210)');
			//if (!isCourseMember($rec)) die(); //cannot sent document to someone outside of course
				//this check is done when validating submitted data
			$this->recipients[] = array('id' => $rec, 'name' => getUserNameFromId($rec));
		}

        $table_post = $dropbox_cnf['tbl_post'];
        $table_person = $dropbox_cnf['tbl_person'];
        $session_id = api_get_session_id();
        $uploader_id = $this->uploader_id;
        $user  = api_get_user_id();
		// Insert data in dropbox_post and dropbox_person table for each recipient
		foreach ($this->recipients as $rec) {
            $file_id = (int)$this->id;
            $user_id = (int)$rec['id'];
			$sql = "INSERT INTO $table_post (c_id, file_id, dest_user_id, session_id)
                    VALUES ($course_id, $file_id, $user_id, $session_id)";
	        $result = Database::query($sql);
            // If work already exists no error is generated

            /**
             * Poster is already added when work is created - not so good to split logic
             */
            if ($user_id != $user) {
                // Insert entries into person table
                $sql = "INSERT INTO $table_person (c_id, file_id, user_id)
                        VALUES ($course_id, $file_id, $user_id)";

                // Do not add recipient in person table if mailing zip or just upload.
                if (!$justSubmit) {
                    $result = Database::query($sql);	// If work already exists no error is generated
                }
            }

			// Update item_property table for each recipient
			if (($ownerid = $this->uploader_id) > $dropbox_cnf['mailingIdBase']) {
			    $ownerid = getUserOwningThisMailing($ownerid);
			}
			if (($recipid = $rec["id"]) > $dropbox_cnf['mailingIdBase']) {
			    $recipid = $ownerid;  // mailing file recipient = mailing id, not a person
			}
			api_item_property_update($_course, TOOL_DROPBOX, $this->id, 'DropboxFileAdded', $ownerid, null, $recipid) ;
		}
	}

	/**
	 * private function creating existing object by retreiving info from db
	 *
	 * @param unknown_type $id
	 */
	function _createExistingSentWork ($id)
    {
        $dropbox_cnf = getDropboxConf();
        $id = intval($id);

		$course_id = api_get_course_int_id();

		// Call constructor of Dropbox_Work object
		$this->Dropbox_Work($id);

		// Fill in recipients array
		$this->recipients = array();
		$sql = "SELECT dest_user_id, feedback_date, feedback
				FROM ".$dropbox_cnf['tbl_post']."
				WHERE c_id = $course_id AND file_id='".Database::escape_string($id)."'";
        $result = Database::query($sql);
		while ($res = Database::fetch_array($result, 'ASSOC')) {

			// Check for deleted users
			$dest_user_id = $res['dest_user_id'];
			$user_info = api_get_user_info($dest_user_id);
			//$this->category = $res['cat_id'];
			if (!$user_info) {
				$this->recipients[] = array('id' => -1, 'name' => get_lang('Unknown', ''));
			} else {
				$this->recipients[] = array(
                    'id' => $dest_user_id,
                    'name' => $user_info['complete_name'],
                    'user_id' => $dest_user_id,
				    'feedback_date' => $res['feedback_date'],
                    'feedback' => $res['feedback']);
			}
		}
	}
}

class Dropbox_Person
{
	// The receivedWork and the sentWork arrays are sorted.
	public $receivedWork;	// an array of Dropbox_Work objects
	public $sentWork;		// an array of Dropbox_SentWork objects

	public $userId = 0;
	public $isCourseAdmin = false;
	public $isCourseTutor = false;
	public $_orderBy = '';	// private property that determines by which field

	/**
	 * Constructor for recreating the Dropbox_Person object
	 *
	 * @param int $userId
	 * @param bool $isCourseAdmin
	 * @param bool $isCourseTutor
	 * @return Dropbox_Person
	 */
	function Dropbox_Person($userId, $isCourseAdmin, $isCourseTutor) {
	    $course_id = api_get_course_int_id();

		// Fill in properties
		$this->userId           = $userId;
		$this->isCourseAdmin    = $isCourseAdmin;
		$this->isCourseTutor    = $isCourseTutor;
		$this->receivedWork     = array();
		$this->sentWork         = array();

		// Note: perhaps include an ex coursemember check to delete old files

		$session_id = api_get_session_id();
		$condition_session = api_get_session_condition($session_id);

		$post_tbl = Database::get_course_table(TABLE_DROPBOX_POST);
		$person_tbl = Database::get_course_table(TABLE_DROPBOX_PERSON);
		$file_tbl = Database::get_course_table(TABLE_DROPBOX_FILE);

        // Find all entries where this person is the recipient
		$sql = "SELECT DISTINCT r.file_id, r.cat_id
                FROM $post_tbl r INNER JOIN $person_tbl p
                    ON (r.file_id = p.file_id AND r.c_id = $course_id AND p.c_id = $course_id )
                WHERE
                     p.user_id = ".intval($this->userId)." AND
                     r.dest_user_id = ".intval($this->userId)." $condition_session ";

        $result = Database::query($sql);
		while ($res = Database::fetch_array($result)) {
			$temp = new Dropbox_Work($res['file_id']);
			$temp->category = $res['cat_id'];
			$this->receivedWork[] = $temp;
		}
		// Find all entries where this person is the sender/uploader
        $sql = "SELECT DISTINCT f.id
				FROM $file_tbl f INNER JOIN $person_tbl p
				ON (f.id = p.file_id AND f.c_id = $course_id AND p.c_id = $course_id)
                WHERE
                    f.uploader_id 	= '".Database::escape_string($this->userId)."' AND
                    p.user_id       = '".Database::escape_string($this->userId)."'
                    $condition_session
                ";
        $result = Database::query($sql);
		while ($res = Database::fetch_array($result)) {
			$this->sentWork[] = new Dropbox_SentWork($res['id']);
		}
	}

	/**
	 * This private method is used by the usort function in  the
	 * orderSentWork and orderReceivedWork methods.
	 * It compares 2 work-objects by 1 of the properties of that object, dictated by the
	 * private property _orderBy
	 *
	 * @param unknown_type $a
	 * @param unknown_type $b
	 * @return -1, 0 or 1 dependent of the result of the comparison.
	 */
	function _cmpWork($a, $b)
    {
		$sort = $this->_orderBy;
		$aval = $a->$sort;
		$bval = $b->$sort;
		if ($sort == 'recipients') {  // The recipients property is an array so we do the comparison based on the first item of the recipients array
		    $aval = $aval[0]['name'];
			$bval = $bval[0]['name'];
		}
		if ($sort == 'filesize') {    // Filesize is not a string, so we use other comparison technique
			return $aval < $bval ? -1 : 1;
		} elseif ($sort == 'title') { // Natural order for sorting titles is more "human-friendly"
			return api_strnatcmp($aval, $bval);
		} else {
		    return api_strcasecmp($aval, $bval);
		}
	}

	/**
	 * A method that sorts the objects in the sentWork array, dependent on the $sort parameter.
	 * $sort can be lastDate, firstDate, title, size, ...
	 *
	 * @param unknown_type $sort
	 */
	function orderSentWork($sort)
    {
		switch($sort) {
			case 'lastDate':
				$this->_orderBy = 'last_upload_date';
				break;
			case 'firstDate':
				$this->_orderBy = 'upload_date';
				break;
			case 'title':
				$this->_orderBy = 'title';
				break;
			case 'size':
				$this->_orderBy = 'filesize';
				break;
			case 'author':
				$this->_orderBy = 'author';
				break;
			case 'recipient':
				$this->_orderBy = 'recipients';
				break;
			default:
				$this->_orderBy = 'last_upload_date';
		}

		usort($this->sentWork, array($this, '_cmpWork'));
	}

	/**
	 * method that sorts the objects in the receivedWork array, dependent on the $sort parameter.
	 * $sort can be lastDate, firstDate, title, size, ...
	 * @param unknown_type $sort
	 */
	function orderReceivedWork($sort) {
		switch($sort) {
			case 'lastDate':
				$this->_orderBy = 'last_upload_date';
				break;
			case 'firstDate':
				$this->_orderBy = 'upload_date';
				break;
			case 'title':
				$this->_orderBy = 'title';
				break;
			case 'size':
				$this->_orderBy = 'filesize';
				break;
			case 'author':
				$this->_orderBy = 'author';
				break;
			case 'sender':
				$this->_orderBy = 'uploaderName';
				break;
			default:
				$this->_orderBy = 'last_upload_date';
		}

		usort($this->receivedWork, array($this, '_cmpWork'));
	}

	/**
	 * Deletes all the received work of this person
	 */
	function deleteAllReceivedWork () {
	    $course_id = api_get_course_int_id();
        $dropbox_cnf = getDropboxConf();
		// Delete entries in person table concerning received works
		foreach ($this->receivedWork as $w) {
			Database::query("DELETE FROM ".$dropbox_cnf['tbl_person']." WHERE c_id = $course_id AND user_id='".$this->userId."' AND file_id='".$w->id."'");
		}
		removeUnusedFiles();	// Check for unused files
	}

	/**
	 * Deletes all the received categories and work of this person
	 */
	function deleteReceivedWorkFolder($id)
    {
        $dropbox_cnf = getDropboxConf();
        $course_id = api_get_course_int_id();

		$id = intval($id);
		$sql = "DELETE FROM ".$dropbox_cnf['tbl_file']." WHERE c_id = $course_id AND cat_id = '".$id."' ";
		if (!Database::query($sql)) return false;
		$sql = "DELETE FROM ".$dropbox_cnf['tbl_category']." WHERE c_id = $course_id AND cat_id = '".$id."' ";
		if (!Database::query($sql)) return false;
		$sql = "DELETE FROM ".$dropbox_cnf['tbl_post']." WHERE c_id = $course_id AND cat_id = '".$id."' ";
		if (!Database::query($sql)) return false;
		return true;
	}

	/**
	 * Deletes a received dropbox file of this person with id=$id
	 *
	 * @param integer $id
	 */
	function deleteReceivedWork($id)
    {
	    $course_id = api_get_course_int_id();
        $dropbox_cnf = getDropboxConf();
		$id = intval($id);

		// index check
		$found = false;
		foreach ($this->receivedWork as $w) {
			if ($w->id == $id) {
			   $found = true;
			   break;
			}
		}

		if (!$found) {
			if (!$this->deleteReceivedWorkFolder($id)) {
				die(get_lang('GeneralError').' (code 216)');
			}
		}
		// Delete entries in person table concerning received works
        $sql = "DELETE FROM ".$dropbox_cnf['tbl_person']." WHERE c_id = $course_id AND user_id = '".$this->userId."' AND file_id ='".$id."'";
		Database::query($sql);
		removeUnusedFiles();	// Check for unused files
	}

	/**
	 * Deletes all the sent dropbox files of this person
	 */
	function deleteAllSentWork()
    {
	    $course_id = api_get_course_int_id();
        $dropbox_cnf = getDropboxConf();
		//delete entries in person table concerning sent works
		foreach ($this->sentWork as $w) {
			Database::query("DELETE FROM ".$dropbox_cnf['tbl_person']." WHERE c_id = $course_id AND user_id='".$this->userId."' AND file_id='".$w->id."'");
			removeMoreIfMailing($w->id);
		}
		removeUnusedFiles();	// Check for unused files
	}

	/**
	 * Deletes a sent dropbox file of this person with id=$id
	 *
	 * @param unknown_type $id
	 */
	function deleteSentWork($id)
    {
	    $course_id = api_get_course_int_id();
        $dropbox_cnf = getDropboxConf();

		$id = intval($id);

		// index check
		$found = false;
		foreach ($this->sentWork as $w) {
			if ($w->id == $id) {
			   $found = true;
			   break;
			}
		}
		if (!$found) {
			if (!$this->deleteReceivedWorkFolder($id)) {
				die(get_lang('GeneralError').' (code 219)');
			}
		}
		//$file_id = $this->sentWork[$index]->id;
		// Delete entries in person table concerning sent works
		Database::query("DELETE FROM ".$dropbox_cnf['tbl_person']." WHERE c_id = $course_id AND user_id='".$this->userId."' AND file_id='".$id."'");
		removeMoreIfMailing($id);
		removeUnusedFiles();	// Check for unused files
	}

	/**
	 * Updates feedback for received work of this person with id=$id
	 *
	 * @param unknown_type $id
	 * @param unknown_type $text
	 */
	function updateFeedback($id, $text)
    {
	    $course_id = api_get_course_int_id();
        $_course = api_get_course_info();
        $dropbox_cnf = getDropboxConf();

		$id = intval($id);

		// index check
		$found = false;
		$wi = -1;
		foreach ($this->receivedWork as $w) {
			$wi++;
			if ($w->id == $id){
			   $found = true;
			   break;
			}  // foreach (... as $wi -> $w) gives error 221! (no idea why...)
		}
		if (!$found) {
			die(get_lang('GeneralError').' (code 221)');
		}

		$feedback_date = date('Y-m-d H:i:s', time());
		$this->receivedWork[$wi]->feedback_date = $feedback_date;
		$this->receivedWork[$wi]->feedback = $text;

		Database::query("UPDATE ".$dropbox_cnf['tbl_post']." SET feedback_date='".
		    Database::escape_string($feedback_date)."', feedback='".Database::escape_string($text).
		    "' WHERE c_id = $course_id AND dest_user_id='".$this->userId."' AND file_id='".$id."'");

		// Update item_property table

		if (($ownerid = $this->receivedWork[$wi]->uploader_id) > $dropbox_cnf['mailingIdBase']) {
		    $ownerid = getUserOwningThisMailing($ownerid);
		}
		api_item_property_update($_course, TOOL_DROPBOX, $this->receivedWork[$wi]->id, 'DropboxFileUpdated', $this->userId, null, $ownerid) ;

	}

	/**
	 * Filter the received work
	 * @param string $type
	 * @param string $value
	 */
	function filter_received_work($type, $value)
    {
        $dropbox_cnf = getDropboxConf();
    	$new_received_work = array();
		foreach ($this->receivedWork as $work) {
			switch ($type) {
				case 'uploader_id':
					if ($work->uploader_id == $value ||
						($work->uploader_id > $dropbox_cnf['mailingIdBase'] && getUserOwningThisMailing($work->uploader_id) == $value)) {
						$new_received_work[] = $work;
					}
					break;
				default:
					$new_received_work[] = $work;
			}
		}
		$this->receivedWork = $new_received_work;
	}
}