import sys
import serial
import logging
import konfig
import time
from mysql.connector import connect, Error
from time import sleep

Log_Format = "%(levelname)s %(module)s:%(lineno)d %(asctime)s - %(message)s"
logging.basicConfig(stream=sys.stdout, format = Log_Format, level=logging.INFO)
logger = logging.getLogger()
comeTimeID = 0
def checksum(data):
    checksum = 0;
    len = int(data[1:3])
    if(len < 99):
        for i in range(1, len+3):
            checksum = checksum ^ ord(data[i:i+1])
            #print(str(i)+":"+str(data[i:i+1])+" "+hex(ord(data[i:i+1])))
    return checksum & 0xFF;


def writeCmd(cmd,data):
    length = str(len(data)+1).zfill(2)
    msg = '#'+ length + cmd + data
    cs = str(checksum(str.encode(msg))).zfill(3)
    #print("Len: "+str(len(data)+1))
    #print("MEssage: "+msg+" CS: "+cs)
    con.write(str.encode(msg+cs+"\n"))

def getMaID(id):
    comeTimeID = 0
    try:
        with connect(**konfig.datenbank()) as connection:
            with connection.cursor() as cursor:
                cursor.execute("SELECT id FROM user WHERE rfid = '"+str(id[0:8])+"';")
                maid = cursor.fetchone()
                connection.commit()
                if maid == None:
                    writeCmd('M',"NeuerTag "+str(id[0:8]))
                    logger.warning("Employee not found rfID: %s",str(id[0:8]))
                else:
                    cursor.execute("SELECT id FROM zeiten WHERE ma_id = "+maid[0]+" AND DATE(kommen) = DATE(NOW()) AND gehen = '1990-01-01 00:00:00';")
                    cometime = cursor.fetchone()
                    connection.commit()
                    if cometime == None:
                        writeCmd('C',"")
                        cursor.execute("INSERT INTO zeiten (kommen, gehen, ma_id) VALUES (NOW(), '1990-01-01 00:00:00', "+maid[0]+")")
                        connection.commit()
                    else:
                        writeCmd('G',"")
                        return str(cometime[0])

    except:
        writeCmd('M',"Datenbankverbindung\n\rfehlgeschlagen")
        logger.warning("DB connection failed!")


#con = serial.Serial("COM7",115200,timeout=2,parity=serial.PARITY_NONE, dsrdtr=False)
#con.write('#')
#con.write('\n')
#sleep(2)
#writeCmd("T",str(int(time.time())))
#print(con.read_all())
con = None
while True:
    try:
        if(con == None):
            con = serial.Serial("COM7",115200,timeout=2,parity=serial.PARITY_NONE, dsrdtr=False)
            print("Reconnecting")
            sleep(2)
            writeCmd("T",str(int(time.time())))
        line=con.readline()
        if len(line) > 10:
            logger.info("MSG: "+str(line)+" "+str(line[3:4]))
            if(line[3:4] == b'I'):
                logger.info("TAG!")
                cometimeID = getMaID(line[4:4+8])
            elif(line[3:4] == b'P'):
                logger.info("PAUSE!")
                pause = str(line(4,4+3))
                if(cometimeID != None):
                    try:
                        with connect(**konfig.datenbank()) as connection:
                            with connection.cursor() as cursor:
                                cursor.execute("UPDATE zeiten SET gehen = NOW(), pause_mins="+pause+" WHERE id = "+cometimeID)
                                maid = cursor.fetchone()
                                connection.commit()
                                writeCmd('P',"")
                    except:
                        writeCmd('M',"Eintragen\n\rfehlgeschlagen")
                        logger.warning("Could not update entry with Go time")
    except:
        if(not(con == None)):
            con.close()
            con = None
            logger.warning("Disconnecting")
        time.sleep(2)