import unittest
from test.helpers.amper import Amper


class Qamper(unittest.TestCase):
    params = None
    __resultlist = None  # resultlist is a python list of python dictionaries
    dummytest = False

    # varlist: undercurrent, overcurrent
    def __init__(self, testname, testfunc, varlist):
        self.params = varlist
        super(Qamper, self).__init__(testfunc)

        if "undercurrent" in varlist:
            self._undercurrent = varlist["undercurrent"]
        else:
            raise Exception('undercurrent param inside Qamp must be defined')
        if "overcurrent" in varlist:
            self._overcurrent = varlist["overcurrent"]
        else:
            raise Exception('overcurrent param inside Qamp must be defined')
        self._testMethodDoc = testname
        self.__resultlist = []
        if "dummytest" in varlist:
            self.dummytest = varlist["dummytest"]

    def saveresultinfile(self, currentvalue):
        # save result in a file
        with open('/mnt/station_ramdisk/amper.txt', 'w') as outfile:
            n = outfile.write("Current: {} A".format(currentvalue))
        outfile.close()
        self.__resultlist.append(
            {
                "description": "Amperimeter values",
                "filepath": "/mnt/station_ramdisk/amper.txt",
                "mimetype": "text/plain"
            }
        )

    def execute(self):
        if self.dummytest:
            self.current = "0.0"
            self.saveresultinfile(self.current)
            return

        amp = Amper()
        # open serial connection
        if not amp.open():
            self.fail("Error: can not open a serial port")
        # check if the amperimeter is connected and working
        # 2 ATTEMTS
        if not amp.hello():
            if not amp.hello():
                self.fail("Error: can not communicate")
        # get current value (in Amperes)
        self.current = amp.getCurrent()
        # save result in a file
        self.saveresultinfile(self.current)
        # close serial connection
        amp.close()
        # Check current range
        if float(self.current) > float(self._overcurrent):
            # Overcurrent detected
            self.fail("failed: Overcurrent detected ( {} )".format(self.current))
        elif float(self.current) < float(self._undercurrent):
            # Undercurrent detected
            self.fail("failed: Undercurrent detected ( {} )".format(self.current))

    def getresults(self):
        return self.__resultlist

    def gettextresult(self):
        return "{} A".format(self.current)