import serial.tools.list_ports
import sys, getopt
import time


def main(argv):
    cmd = 'GETSTATE'
    print("USBCaseControl starting up...")
    try:
        opts, args = getopt.getopt(argv,"hc:",["cmd="])
    except getopt.GetoptError as err:
        print(err)
        sys.exit(2)
    for opt, arg in opts:
        if opt == '-h':
            print("USBCaseControl.py --cmd <command>")
            sys.exit()
        elif opt in ("-c", "--cmd"):
            cmd = arg            
    ports = serial.tools.list_ports.comports()
    for port, desc, hwid in sorted(ports):
        if "Arduino Leonardo" in desc:
            print("{}: {} [{}]".format(port, desc, hwid))
            finalport=port
    ser = serial.Serial(finalport, 9600, timeout=0,parity=serial.PARITY_EVEN, rtscts=1)
    print("Calling command: {} on Port {}".format(cmd,port))
    ser.write(cmd.encode('utf_8'))
    time.sleep(2)
    out = ser.read(100)
    print("Command return: {}".format(out.decode(encoding="utf_8", errors="ignore")))

if __name__ == "__main__":
   main(sys.argv[1:])