import sh
import unittest
import time
import re


class Qrtc(unittest.TestCase):
    params = None
    __rtc = None

    def __init__(self, testname, testfunc, varlist):
        self.params = varlist
        super(Qrtc, self).__init__(testfunc)
        if "rtc" in varlist:
            self.__rtc = varlist["rtc"]
        else:
            raise Exception('rtc param inside Qrtc must be defined')
        self._testMethodDoc = testname

    def execute(self):
        # get time from RTC peripheral
        p = sh.hwclock("-f", self.__rtc)
        if p.exit_code == 0:
            time1 = re.search("([01]?[0-9]{1}|2[0-3]{1})[:][0-5]{1}[0-9]{1}[:][0-5]{1}[0-9]{1}",
                              p.stdout.decode('ascii'))
            time.sleep(1)
            # get time from RTC another time
            p = sh.hwclock("-f", self.__rtc)
            if p.exit_code == 0:
                time2 = re.search("([01]?[0-9]{1}|2[0-3]{1})[:][0-5]{1}[0-9]{1}[:][0-5]{1}[0-9]{1}",
                                  p.stdout.decode('ascii'))
                # check if the seconds of both times are different
                if time1 == time2:
                    self.fail("failed: RTC is not running")
            else:
                self.fail("failed: couldn't execute hwclock command 2nd time")
        else:
            self.fail("failed: couldn't execute hwclock command")