<?php
// Datenbank-Verbindungsparameter
require_once ('dbutils.php');
require_once ('commonutils.php');

class Bill {
	var $dbutils;

	function __construct() {
		$this->dbutils = new DbUtils();
	}

	function handleCommand($command) {
		if ($command == 'exportCsv') {
			if ($this->hasCurrentUserAdminOrManagerRights()) {
				// yes, we can export the data
				$this->exportCsv($_GET['startMonth'],$_GET['startYear'],$_GET['endMonth'],$_GET['endYear']);			
			} else {
				echo json_encode(array("status" => "ERROR", "code" => ERROR_BILL_NOT_AUTHOTRIZED, "msg" => ERROR_BILL_NOT_AUTHOTRIZED_MSG));
			}
			return;
		}
		if ($command == 'exportCsvOfClosing') {
			if ($this->hasCurrentUserAdminOrManagerRights()) {
				// yes, we can export the data
				$this->exportCsvOfClosing($_GET['closingid']);
			} else {
				echo json_encode(array("status" => "ERROR", "code" => ERROR_MANAGER_NOT_AUTHOTRIZED, "msg" => ERROR_MANAGER_NOT_AUTHOTRIZED_MSG));
			}
			return;
		}
		
		if ($this->hasCurrentUserBillRights()) {
			if ($command == 'getLastBillsWithContent') {
				$this->getLastBillsWithContent();
			} else if ($command == 'cancelBill') {
				$this->cancelBill($_POST['billid'],$_POST['stornocode']);
			} else if ($command == 'doCashAction') {
				$this->doCashAction($_POST['money']);
			} else if ($command == 'getCashOverviewOfUser') {
				$this->getCashOverviewOfUser();
			} else {
				echo "Command not supported.";
			}
		} else {
			echo json_encode(array("status" => "ERROR", "code" => ERROR_BILL_NOT_AUTHOTRIZED, "msg" => ERROR_BILL_NOT_AUTHOTRIZED_MSG));
		}
	}

	// for internal request
	private function hasCurrentUserBillRights() {
		session_start();
		if (!isset($_SESSION['angemeldet']) || !$_SESSION['angemeldet']) {
			// no user logged in
			return false;
		} else {
			return ($_SESSION['right_bill']);
		}
	}
	
	// for internal request
	private function hasCurrentUserAdminOrManagerRights() {
		session_start();
		if (!isset($_SESSION['angemeldet']) || !$_SESSION['angemeldet']) {
			// no user logged in
			return false;
		} else {
			return ($_SESSION['right_manager'] || $_SESSION['is_admin']);
		}
	}
	
	private function billWithId($billid) {
		$pdo = $this->dbutils->openDbAndReturnPdo();
		$pdo->beginTransaction();
		
		$sql = "SELECT content FROM %bill% WHERE id=?";
		$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($sql));
		$stmt->execute(array($billid));
		$row =$stmt->fetchObject();
		if ($row != null) {
			return stripslashes($row->content);
		}
	}
	
	
	// TODO: needed???
	function getBillWithId($billid) {
		echo json_encode($this->billWithId($billid));
	}
	
	/*
	 * insert or take out cash money. The direction done by sign of $money value
	 */
	private function doCashAction($money) {
		// current time
		date_default_timezone_set('Europe/Berlin');
		$currentTime = date('Y-m-d H:i:s');
		
		$pdo = $this->dbutils->openDbAndReturnPdo();
		$pdo->beginTransaction();
		
		$sql = "SELECT sum(brutto) as bruttosum FROM %bill% WHERE closingid is null AND paymentid='1'";
		$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($sql));
		$stmt->execute();
		$row =$stmt->fetchObject();
		if ($row != null) {
			$sum = $row->bruttosum;
			if (is_null($sum)) {
				// no transaction after last closing
				$sum = 0.0;
			}
			if (($sum + floatval($money)) >= 0.0) {
				$userId = $this->getUserId();
				$sql = "INSERT INTO `%bill%` (`id` , `billdate`,`content`,`brutto`,`netto`,`tax`,`tableid`, `status`, `paymentid`,`userid`,`ref`) VALUES ( NULL, ? , ?, ?,?,?, ?, 'c', ?,?,?)";
				$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($sql));
				$stmt->execute(array($currentTime,NULL,$money,$money,'0.00',-1,1,$userId,NULL));
				$pdo->commit();
				echo json_encode(array("status" => "OK"));
			} else {
				echo json_encode(array("status" => "ERROR", "code" => ERROR_BILL_LESS_MONEY_TO_TAKE_OUT, "msg" => ERROR_BILL_LESS_MONEY_TO_TAKE_OUT_MSG));
			}
		} else {
			$pdo->rollBack();
			echo json_encode(array("status" => "ERROR", "code" => ERROR_GENERAL_PAYDESK_SUM, "msg" => ERROR_GENERAL_PAYDESK_SUM_MSG));
			return;
		}
	}
	
	/*
	 * User may ask what money he should have in his pocket by serving the guests. If the inserts and 
	 * take outs are in in his waiter paydesk then this value is of interest, too. Return both.
	 */
	function getCashOverviewOfUser() {
		$userId = $this->getUserId();
		
		// without cash insert and cash takeout
		$onlyCashByGuests = 0.0;
		$pdo = $this->dbutils->openDbAndReturnPdo();
		$sql = "SELECT sum(brutto) as sumtotal FROM %bill% WHERE closingid is null AND status is null AND paymentid=1 AND userid='$userId'";
		$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($sql));
		$stmt->execute();
		$row =$stmt->fetchObject();
		if ($row != null) {
			if ($row->sumtotal != null) {
				$onlyCashByGuests = $row->sumtotal;
			}
		}
		
		// with cash
		$cashByGuestsAndInsertTakeOut = 0.0;
		$sql = "SELECT sum(brutto) as sumtotal FROM %bill% WHERE closingid is null AND paymentid='1' AND userid='$userId' AND (status is null OR status ='c')";
		$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($sql));
		$stmt->execute();
		$row =$stmt->fetchObject();
		if ($row != null) {
			if ($row->sumtotal != null) {
				$cashByGuestsAndInsertTakeOut = $row->sumtotal;
			}
		}
		echo json_encode(array("guestmoney" => $onlyCashByGuests, "total" => $cashByGuestsAndInsertTakeOut));
	}
	
	function getLastBillsWithContent() {
		$commonUtils = new CommonUtils();
		$sql = "SELECT id,billdate,brutto,tableid,closingid,status FROM %bill% WHERE tableid >= '0' AND status is null ORDER BY billdate DESC LIMIT 20;";
		$dbresult = $this->dbutils->performSqlCommand($sql);
		
		$resultarray = array();
		while ($zeile = mysqli_fetch_array( $dbresult, MYSQL_ASSOC))
		{
			$theId = $zeile['id'];
			$theHtmlContentOfBill = $this->billWithId($theId);
			$date = new DateTime($zeile['billdate']);
			$shortdate = $date->format('H:i');
			$closingID = $zeile['closingid'];
			$isClosed = (is_null($closingID) ? 0 : 1);
			$arr = array("id" => $theId,
					"longdate" => $zeile['billdate'],
					"shortdate" => $shortdate,
					"brutto" => $zeile['brutto'],
					"tablename" => $commonUtils->getTableNameFromId($zeile['tableid']),
					"billcontent" => $theHtmlContentOfBill,
					"isClosed" => $isClosed
			);
			$resultarray[] = $arr;
		}
		mysqli_free_result( $dbresult );
		
		echo json_encode(array("status" => "OK", "code" => OK, "msg" => $resultarray));
	}

	private function getUserId() {
		if(session_id() == '') {
			session_start();
		}
		return $_SESSION['userid'];
	}
	
	/*
	 * Cancel a bill - set all queue items to not paid and drop the bill entry
	 */
	private function cancelBill($billid,$stornocode) {
		// current time
		date_default_timezone_set('Europe/Berlin');
		$currentTime = date('Y-m-d H:i:s');
		
		// check if stornocode is correct
		$sql = "SELECT setting FROM %config% WHERE name='stornocode'";
		$dbresult = $this->dbutils->performSqlCommand($sql);
		$numberOfVals = mysqli_num_rows($dbresult);
		if ($numberOfVals != 1) {
			// stornocode not fixed
			mysqli_free_result( $dbresult );
			echo json_encode(array("status" => "ERROR", "code" => ERROR_BILL_NOT_STORNO_CODE, "msg" => ERROR_BILL_NOT_STORNO_CODE_MSG));
			return;
		}
		
		$zeile = mysqli_fetch_array( $dbresult, MYSQL_ASSOC);
		$stornocodeInDb = $zeile['setting'];
		
		mysqli_free_result( $dbresult );
		if ($stornocode != $stornocodeInDb) {
			echo json_encode(array("status" => "ERROR", "code" => ERROR_BILL_WRONG_STORNO_CODE, "msg" => ERROR_BILL_WRONG_STORNO_CODE_MSG));
			return;
		}
		
		if (!is_numeric($billid)) {
			// this may be an attack...
			echo json_encode(array("status" => "ERROR", "code" => ERROR_BILL_WRONG_NUMERIC_VALUE, "msg" => ERROR_BILL_WRONG_NUMERIC_VALUE_MSG));
			return;
		}
		
		// Do transactional cancel
		
		$pdo = $this->dbutils->openDbAndReturnPdo();
		$pdo->beginTransaction();
		
		// is the bill already closed? In this case no cancel is allowed!
		$sql = "SELECT content,brutto,netto,tax,tableid,closingid,status,paymentid FROM %bill% WHERE id=?";
		$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($sql));
		$stmt->execute(array($billid));
		$row =$stmt->fetchObject();
		$closingId = null;
		if ($row != null) {
			$closingId = $row->closingid;
			
			// save the next data for a copy!
			$content = $row->content;
			$brutto = $row->brutto;
			$netto = $row->netto;
			$tax = $row->tax;
			$tableid = $row->tableid;
			$status = $row->status;
			$paymentid = $row->paymentid;
		}
		
		if (!is_null($closingId) || ($status == 's') || ($status == 'x')) {
			// no cancel possible anymore!
			$pdo->rollBack();
			if (($status == 's') || ($status == 'x')) {
				echo json_encode(array("status" => "ERROR", "code" => ERROR_BILL_ALREADY_CANCELLED, "msg" => ERROR_BILL_ALREADY_CANCELLED_MSG));
			} else {
				echo json_encode(array("status" => "ERROR", "code" => ERROR_BILL_ALREADY_CLOSED, "msg" => ERROR_BILL_ALREADY_CLOSED_MSG));
			}
			
			return;
		}
		
		// 0. find the queueitems that are related to that bill
		$sql = "SELECT id FROM %queue% WHERE billid=?";
		$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($sql));
		$stmt->execute(array($billid));
		$result = $stmt->fetchAll();
		$queueIdArray = array();
		
		foreach($result as $row) {
			$queueIdArray[] = $row['id'];
		}
		
		// 1. clear connection between queue item and bill
		$sql = "UPDATE %queue% SET paidtime=null WHERE billid=?";
		$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($sql));
		$stmt->execute(array($billid));
		
		// 2. copy bill with negativ brutto as part of storno
		$userIdOfStornoUser = $this->getUserId();
		$stornval = 0.0 - floatval($brutto);
		$stornonettoval = 0.0 - floatval($netto);
		$sql = "INSERT INTO `%bill%` (`id` , `billdate`,`content`,`brutto`,`netto`,`tax`,`tableid`, `status`, `paymentid`,`userid`,`ref`) VALUES ( NULL, ? , ?, ?, ?,?,?, 's', ?,?,?)";
		$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($sql));
		$stmt->execute(array($currentTime,$content,$stornval,$stornonettoval,$tax,$tableid,$paymentid,$userIdOfStornoUser,$billid));
		$refIdOfStornoEntry = $pdo->lastInsertId();
		
		// 3. mark bill as part of storno
		$sql = "UPDATE %bill% SET status='x', closingid=null, ref=? WHERE id=?";
		$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($sql));
		$stmt->execute(array($refIdOfStornoEntry,$billid));

		// 4. now put the queue items into the billproducts so that later storno is evaluable
		foreach ($queueIdArray as $aQueueid) {
			$billProdsSql = "INSERT INTO `%billproducts%` (`queueid` , `billid`) VALUES ( ?,?)";
			$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($billProdsSql));
			$stmt->execute(array($aQueueid,$refIdOfStornoEntry));
		}

		$pdo->commit();
		// end of transactional cancel
		
		echo json_encode(array("status" => "OK", "code" => OK));
		return;
	}
	
	private function exportCsv($startMonth,$startYear,$endMonth,$endYear) {
		$this->exportCsv_bin($startMonth,$startYear,$endMonth,$endYear,null);
	}
	
	/*
	 * Method to export data of a special closing
	 */
	private function exportCsvOfClosing($closingid) {
		$this->exportCsv_bin(null,null,null,null,$closingid);
	}
	
	private function exportCsv_bin($startMonth,$startYear,$endMonth,$endYear,$onlyClosingId) {
		if ($onlyClosingId == null) {
			if ($startMonth < 10) {
				$startMonth = "0" . $startMonth;
			}
			if ($endMonth < 10) {
				$endMonth = "0" . $endMonth;
			}
			$startDate = $startYear . "-" . $startMonth . "-01 00:00:00";
			// now find last day of month of end date!
			$endDate = $endYear . "-" . $endMonth . "-01";
			$lastdayOfMonth = date("t", strtotime($endDate));
			$endDate = $endYear . "-" . $endMonth . "-" . $lastdayOfMonth . " 23:59:59";
		}
		
		$file_name = "datenexport.csv";
		header("Content-type: text/x-csv");
		header("Content-Disposition: attachment; filename=$file_name");
		header("Cache-Control: must-revalidate, post-check=0, pre-check=0");
		header("Pragma: no-cache");
		header("Expires: 0");
		if ($onlyClosingId == null) {
			echo("Bonid;Bondatum;Brutto;Netto;MwSt;Status;Referenzbon-ID;Benutzerid;Benutzername;Tageslosung-ID; Tageslosung-Datum; Zahlungsart; Tageslosung-Bemerkung\n");
		} else {
			// closing id is know - do not output unnecessary info
			echo("Bonid;Bondatum;Brutto;Netto;MwSt;Status;Referenzbon-ID;Benutzerid;Benutzername;Zahlungsart\n");
		}
		
		// first get the billids for that closing
		$billIdsForThatClosing = array();
		$sql = "SELECT DISTINCT %bill%.id,billdate,brutto,netto,tax,status,closingdate,remark,%bill%.closingid,%payment%.name,userid,ref,username FROM %bill%,%closing%,%payment%,%user% ";
		$sql .= "WHERE closingid is not null AND %bill%.closingid=%closing%.id ";
		$sql .= " AND %bill%.paymentid=%payment%.id ";
		if ($onlyClosingId == null) {
			// search for time span
			$sql .= " AND %bill%.billdate BETWEEN '$startDate' AND '$endDate' ";
		} else {
			// search for a special closing id
			$sql .= " AND closingid='$onlyClosingId' ";
		}
	
		$sql .= " AND %bill%.userid = %user%.id ";
		$sql .= "ORDER BY billdate";
		
		$dbresult = $this->dbutils->performSqlCommand($sql);
		
		$retValues = array();
		
		while ($zeile = mysqli_fetch_array( $dbresult, MYSQL_ASSOC)) {
			$billid = $zeile['id'];
			$billdate = $zeile['billdate'];
			$brutto = str_replace(".",",",$zeile['brutto']);
			$netto = str_replace(".",",",$zeile['netto']);
			$tax = str_replace(".",",",$zeile['tax']);
			$status = $zeile['status'];
			if ($status == 'x') {
				$status = "nachher storniert";
			} else if ($status == 's') {
				$status = "Stornierungsbuchung";
			} else if ($status == 'c') {
				$status = "Bareinlage/-entnahme";
			} else {
				$status = "";
			}
			$ref = ($zeile['ref'] == null ? "" : $zeile['ref']);
			$userid = $zeile['userid'];
			$username = $zeile['username'];
			$closingid = $zeile['closingid'];
			$closingdate = $zeile['closingdate'];
			$remark = '"' . addslashes($zeile['remark']) . '"';
			$paymentname = '"' . addslashes($zeile['name']) . '"';
			if ($billid == null) {
				$billid = "-";
			}
			
			if ($onlyClosingId == null) {
				echo "$billid ; $billdate; $brutto; $netto; $tax; $status; $ref; $userid; $username ; $closingid; $closingdate; $paymentname; $remark\n";
			} else {
				echo "$billid ; $billdate; $brutto; $netto; $tax; $status; $ref; $userid; $username ; $paymentname\n";
			}
		}
		mysqli_free_result( $dbresult );
	}
}
?>