import unittest
import uuid
import serial
import time


class Qserial(unittest.TestCase):
    params = None
    __port = None
    __baudrate = None
    __resultlist = None  # resultlist is a python list of python dictionaries

    # varlist: port, baudrate
    def __init__(self, testname, testfunc, varlist):
        self.params = varlist
        super(Qserial, self).__init__(testfunc)
        if "port" in varlist:
            self.__port = varlist["port"]
        else:
            raise Exception('port param inside Qserial must be defined')

        if "baudrate" in varlist:
            self.__baudrate = varlist["baudrate"]
        else:
            raise Exception('baudrate param inside Qserial must be defined')
        self._testMethodDoc = testname
        self.__resultlist = []

        # open serial connection
        self.__serial = serial.Serial(self.__port, self.__baudrate, timeout=1)

    def __del__(self):
        self.__serial.close()

    def execute(self):
        # generate a random uuid
        test_uuid = str(uuid.uuid4()).encode()
        # clean serial port
        self.__serial.flushInput()
        self.__serial.flushOutput()
        # send the uuid through serial port
        self.__serial.write(test_uuid)
        time.sleep(0.05)  # there might be a small delay
        if self.__serial.inWaiting() == 0:
            self.fail("failed: port {} wait timeout exceded".format(self.__port))
        else:
            # check if what it was sent is equal to what has been received
            if self.__serial.readline() != test_uuid:
                self.fail("failed: port {} write/read mismatch".format(self.__port))

    def getresults(self):
        return self.__resultlist

    def gettextresult(self):
        return ""