import unittest
import sh
import re


class Qwifi(unittest.TestCase):
    __serverip = None
    __numbytestx = None
    __bind = None
    __bwexpected = None
    __port = None
    params = None

    # varlist content: serverip, bwexpected, port, (optional)bind
    def __init__(self, testname, testfunc, varlist):
        self.params = varlist
        super(Qwifi, self).__init__(testfunc)
        if "serverip" in varlist:
            self.__serverip = varlist["serverip"]
        else:
            raise Exception('serverip param inside Qwifi have been be defined')
        if "bwexpected" in varlist:
            self.__bwexpected = varlist["bwexpected"]
        else:
            raise Exception('OKBW param inside Qwifi must be defined')
        if "port" in varlist:
            self.__port = varlist["port"]
        else:
            raise Exception('port param inside Qwifi must be defined')
        if "bind" in varlist:
            self.__bind = varlist["bind"]
        else:
            self.__bind = None
        self.__numbytestx = "10M"
        self._testMethodDoc = testname

    def execute(self):
        # check if the board is connected to the router by wifi
        p = sh.iw("wlan0", "link")
        if p.exit_code == 0:
            # get the first line of the output stream
            out1 = p.stdout.decode('ascii').splitlines()[0]
            if out1 != "Not connected.":
                # check if the board has ip in the wlan0 interface
                p = sh.ifconfig("wlan0")
                if p.exit_code == 0:
                    # check if wlan0 has an IP
                    result = re.search(
                        'inet addr:(?!127\.0{1,3}\.0{1,3}\.0{0,2}1$)((25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)',
                        p.stdout.decode('ascii'))
                    if result:
                        # execute iperf command against the server
                        if self.__bind is None:
                            p = sh.iperf("-c", self.__serverip, "-x", "CMSV", "-n", self.__numbytestx, "-f", "m", "-p",
                                         self.__port)
                        else:
                            p = sh.iperf("-c", self.__serverip, "-x", "CMSV", "-n", self.__numbytestx, "-f", "m", "-p",
                                         self.__port, "-B", self.__bind)
                        # check if it was executed succesfully
                        if p.exit_code == 0:
                            if p.stdout == "":
                                self.fail("failed: error executing iperf command")
                            # analyze output string
                            # split by lines
                            lines = p.stdout.splitlines()
                            # get first line
                            dat = lines[1].decode('ascii')
                            # search for the BW value
                            a = re.search("\d+(\.\d)? Mbits/sec", dat)
                            b = a.group().split()
                            bwreal = b[0]

                            # check if BW is in the expected range
                            self.failUnless(float(bwreal) > float(self.__bwexpected) * 0.9,
                                            "failed: speed is lower than spected. Speed(MB/s)" + str(bwreal))
                        else:
                            self.fail("failed: could not complete iperf command")
                    else:
                        self.fail("failed: wlan0 interface doesn't have any ip address.")
                else:
                    self.fail("failed: could not complete ifconfig command.")
            else:
                self.fail("failed: wifi module is not connected to the router.")
        else:
            self.fail("failed: couldn't execute iw command")