<?php
require_once ('dbutils.php');
require_once ('utilities/Emailer.php');

class Reservation {
	var $dbutils;
	function __construct() {
		$this->dbutils = new DbUtils();
	}
	
	function handleCommand($command) {
		if (!$this->isUserAlreadyLoggedInForPhpAndMayReserve()) {
			echo json_encode(array("status" => "ERROR", "code" => ERROR_RES_NOT_AUTHOTRIZED, "msg" => ERROR_RES_NOT_AUTHOTRIZED_MSG));
		} else {
			if ($command == 'createReservation') {
				$this->createReservation($_POST['day'],$_POST['month'],$_POST['year'],$_POST['start'],$_POST['name'],$_POST['email'],$_POST['persons'],$_POST['duration'],$_POST['phone'],$_POST['remark'],$_POST["tableid"]);
			} else if ($command == 'getReservations') {
				$this->getReservations($_GET['day'],$_GET['month'],$_GET['year']);
			} else if ($command == 'changeReservation') {
				$this->changeReservation($_POST['id'],$_POST['day'],$_POST['month'],$_POST['year'],$_POST['start'],$_POST['name'],$_POST['email'],$_POST['persons'],$_POST['duration'],$_POST['phone'],$_POST['remark'],$_POST["tableid"]);
			} else if ($command == 'delReservation') {
				$this->delReservation($_POST['id']);
			} else if ($command == 'emailConfirmReservation') {
				$this->emailConfirmReservation($_POST['to'],$_POST['msg']);
			}
			else {
				echo "Kommando nicht unterstuetzt.";
			}
		}
	}
	
	function isUserAlreadyLoggedInForPhpAndMayReserve() {
		if(session_id() == '') {
			session_start();
		}
		if (!isset($_SESSION['angemeldet']) || !$_SESSION['angemeldet']) {
			return false;
		} else {
			return ($_SESSION['right_reservation']);
		}
	}
	
	private function createReservation($day,$month,$year,$start,$name,$email,$persons,$duration,$phone,$remark,$tableid) {
		$userid = $_SESSION['userid'];
		date_default_timezone_set(DbUtils::getTimeZone());
		$currentTime = date('Y-m-d H:i:s');
		$scheduledDate = "$year-$month-$day 00:00:00";
		if ($tableid <= 0) {
			$tableid = null;
		}
		
		$pdo = DbUtils::openDbAndReturnPdoStatic();
		try {
			$pdo->beginTransaction();
			
			$sql = "INSERT INTO `%reservations%` (
					`id` , `creator`,`creationdate`,`scheduledate`,`name`,`email`,`starttime`,`duration`,`persons`,`phone`,`remark`,`tableid`)
					VALUES (
					NULL , ?,?,?,?,?,?,?,?,?,?,?)";
			$stmt = $pdo->prepare($this->dbutils->resolveTablenamesInSqlString($sql));
			$stmt->execute(array($userid,$currentTime,$scheduledDate,$name,$email,$start,$duration,$persons,$phone,$remark,$tableid));
			$pdo->commit();
			echo json_encode(array("status" => "OK"));
		}
		catch (PDOException $e) {
			$pdo->rollBack();
			echo json_encode(array("status" => "ERROR", "code" => ERROR_GENERAL_DB_NOT_READABLE, "msg" => ERROR_GENERAL_DB_NOT_READABLE_MSG));
		}
	}
	
	private function changeReservation($id,$day,$month,$year,$start,$name,$email,$persons,$duration,$phone,$remark,$tableid) {
		$userid = $_SESSION['userid'];
		date_default_timezone_set(DbUtils::getTimeZone());
		$currentTime = date('Y-m-d H:i:s');
		$scheduledDate = "$year-$month-$day 00:00:00";
		
		$pdo = DbUtils::openDbAndReturnPdoStatic();
		try {
			$pdo->beginTransaction();
				
			$sql = "UPDATE `%reservations%` SET creator=?,creationdate=?,scheduledate=?,name=?,email=?,starttime=?,duration=?,persons=?,phone=?,remark=?,tableid=? WHERE id=?";
			CommonUtils::execSql($pdo, $sql, array($userid,$currentTime,$scheduledDate,$name,$email,$start,$duration,$persons,$phone,$remark,$tableid,$id));
			$pdo->commit();
			echo json_encode(array("status" => "OK"));
		}
		catch (PDOException $e) {
			$pdo->rollBack();
			echo json_encode(array("status" => "ERROR", "code" => ERROR_GENERAL_DB_NOT_READABLE, "msg" => ERROR_GENERAL_DB_NOT_READABLE_MSG));
		}
	}
	
	private function delReservation($id) {
		$pdo = DbUtils::openDbAndReturnPdoStatic();
		try {
			$pdo->beginTransaction();
			$sql = "DELETE FROM `%reservations%` WHERE id=?";
			CommonUtils::execSql($pdo, $sql, array($id));
			$pdo->commit();
			echo json_encode(array("status" => "OK"));
		}
		catch (PDOException $e) {
			$pdo->rollBack();
			echo json_encode(array("status" => "ERROR", "code" => ERROR_GENERAL_DB_NOT_READABLE, "msg" => ERROR_GENERAL_DB_NOT_READABLE_MSG));
		}
	}
	
	private function emailConfirmReservation($toEmail,$msg) {
		// first find sender email
		$pdo = $this->dbutils->openDbAndReturnPdo();

		$msg = str_replace("\n", "\r\n", $msg);
	
		$topictxt = "Reservierungsbestätigung\r\n";
	
		if (Emailer::sendEmail($pdo, $msg, $toEmail, $topictxt)) {
			echo json_encode("OK");
		} else {
			echo json_encode("ERROR");
		}
	}
	
	private function getReservations($day,$month,$year) {
		$pdo = DbUtils::openDbAndReturnPdoStatic();
		
		// REM* the many sortings in the sql allow the sorting by time, room-sort and table-sort
		$sql = "SELECT R.id,U.username as username,creationdate,scheduledate,starttime,name,email,persons,duration,phone,remark,tableid, ";
		$sql .= "IF(tableid is null,'-1',(SELECT RO.id as roomid FROM %room% RO,%resttables% T WHERE T.id=tableid AND T.roomid=RO.id)) as roomid, ";
		$sql .= "IF(tableid is null,'-1',(SELECT RO.sorting as roomsorting FROM %room% RO,%resttables% T WHERE T.id=tableid AND T.roomid=RO.id)) as roomsorting, ";
		$sql .= "IF(tableid is null,'-1',(SELECT T.sorting as tablesorting FROM %room% RO,%resttables% T WHERE T.id=tableid AND T.roomid=RO.id)) as tablesorting ";
		$sql .= "FROM %reservations% R,%user% U ";
		$sql .= "WHERE DATE(scheduledate)=? AND R.creator=U.id ";
		$timeSortedReservations = $this->getReservationsCore($pdo,$day,$month,$year,$sql . " ORDER BY starttime,roomsorting,tablesorting");
		
		// REM* and now by table
		$sql = "SELECT DISTINCT R.tableid as tableid,ROOM.id as roomid,ROOM.sorting as roomsorting,T.sorting as tablesorting FROM %reservations% R,%room% ROOM,%resttables% T ";
		$sql .= " WHERE DATE(scheduledate)=? AND tableid is not null AND tableid >= '0' ";
		$sql .= " AND R.tableid = T.id AND T.roomid=ROOM.id ";
		$sql .= " ORDER BY ROOM.sorting,T.sorting ";
		$day = sprintf("%02s", $day);
		$month = sprintf("%02s", $month);
		$scheduledDate = "$year-$month-$day";
		$allTablesOfResAtThatDate = CommonUtils::fetchSqlAll($pdo, $sql, array($scheduledDate));
		$byTables = array();
		
		foreach($allTablesOfResAtThatDate as $tableRes) {
			$sql = "SELECT R.id,U.username as creator,creationdate,scheduledate,starttime as start,name as guest,email,persons,duration,(starttime + duration) as endhour,";
			$sql .= " phone,remark,tableid,'" . $tableRes["roomid"] . "' as roomid ";
			$sql .= "FROM %reservations% R,%user% U ";
			$sql .= "WHERE DATE(scheduledate)=? AND R.creator=U.id AND tableid=? ";
			$sql .= "ORDER BY starttime";
			$allResOfThatTable = CommonUtils::fetchSqlAll($pdo, $sql, array($scheduledDate,$tableRes["tableid"]));
			$byTables[] = array("tableid" => $tableRes["tableid"],"roomid" => $tableRes["roomid"], "reservations" => $allResOfThatTable);
		}
		// REM* these were all reservations by table at the given date. Let's add all reservations without a table assignment
		$sql = "SELECT R.id,U.username as creator,creationdate,scheduledate,starttime as start,name as guest,email,persons,duration,(starttime + duration) as endhour,";
		$sql .= " phone,remark,'-1' as tableid,'-1' as roomid ";
		$sql .= "FROM %reservations% R,%user% U ";
		$sql .= "WHERE DATE(scheduledate)=? AND R.creator=U.id AND (tableid is null OR tableid='-1') ";
		$sql .= "ORDER BY starttime";
		$allResOfUndefinedTable = CommonUtils::fetchSqlAll($pdo, $sql, array($scheduledDate));
		if (count($allResOfUndefinedTable) > 0) {
			$byTables[] = array("tableid" => '-1',"roomid" => '-1', "reservations" => $allResOfUndefinedTable);
		}

		$msg = array("bytimes" => $timeSortedReservations,"bytables" => $byTables);
		
		// REM* now attach a list of rooms and tables to select for new reservations
		$tableoverview = self::gettablesoverview($pdo);
		
		echo json_encode(array("status" => "OK", "msg" => $msg,"tableoverview" => $tableoverview));
	}
	
	private function getReservationsCore($pdo,$day,$month,$year,$sql) {
		$day = sprintf("%02s", $day);
		$month = sprintf("%02s", $month);
		
		$scheduledDate = "$year-$month-$day";
		
		try {
			$pdo = DbUtils::openDbAndReturnPdoStatic();
			
			$result = CommonUtils::fetchSqlAll($pdo, $sql, array($scheduledDate));

			$resArray = array();
	
			foreach($result as $row) {
				$datetimeparts = explode(" ",$row['scheduledate']);
				$thedate = $datetimeparts[0];
				$thedateparts = explode("-",$thedate);
				$resArray[] = array(
						"id" => $row['id'],
						"creator" => $row['username'],
						"creationdate" => $row['creationdate'],
						"day" => $thedateparts[2],
						"month" => $thedateparts[1],
						"year" => $thedateparts[0],
						"start" => $row['starttime'],
						"guest" => $row['name'],
						"email" => $row['email'],
						"persons" => $row['persons'],
						"duration" => $row['duration'],
						"phone" => $row['phone'],
						"remark" => $row['remark'],
						"roomid" => $row['roomid'],
						"tableid" => $row['tableid']
						);
			}
			return $resArray;
		}
		catch (PDOException $e) {
			return array();
		}
	}
	
	private static function gettablesoverview($pdo) {
		try {
			$tableoverview = array();
			// REM* get only the rooms with not removed tables (active flag is ignored because it may be that the room is active at date for reservation)
			$sql = "SELECT R.id as roomid,R.roomname as roomname,IFNULL(R.abbreviation,'') as abbreviation from %room% R WHERE R.removed is null HAVING (SELECT COUNT(id) FROM %resttables% T WHERE T.roomid=R.id AND T.removed is null) > 0 ORDER BY sorting";

			$rooms = CommonUtils::fetchSqlAll($pdo, $sql);
			foreach($rooms as $aRoom) {
				$sql = "SELECT id,tableno as tablename FROM %resttables% WHERE roomid=? ORDER BY sorting";
				$tablesOfRoom = CommonUtils::fetchSqlAll($pdo, $sql, array($aRoom['roomid']));
				$tableoverview[$aRoom['roomid']] = array("roomid" => $aRoom['roomid'], "roomname" => $aRoom["roomname"],"roomabbreviation" => $aRoom["abbreviation"], "tables" => $tablesOfRoom);
			}
			return $tableoverview;
		} catch (Exception $ex) {
			return array();
		}
	}
}