import unittest
import sh
import re
import json


class Qwifi(unittest.TestCase):
    __serverip = None
    __numbytestx = None
    __bwexpected = None
    __port = None
    params = None
    __bwreal = None
    __resultlist = None  # resultlist is a python list of python dictionaries

    # varlist content: serverip, bwexpected, port
    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')
        self.__numbytestx = "10M"
        self._testMethodDoc = testname
        self.__resultlist = []

    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
                        try:
                            p = sh.iperf3("-c", self.__serverip, "-n", self.__numbytestx, "-f", "m", "-p", self.__port,
                                          "-J", _timeout=30)
                        except sh.TimeoutException:
                            self.fail("failed: iperf timeout reached")

                        # check if it was executed succesfully
                        if p.exit_code == 0:
                            if p.stdout == "":
                                self.fail("failed: error executing iperf command")
                            # analyze output string
                            data = json.loads(p.stdout.decode('ascii'))
                            self.__bwreal = float(data['end']['sum_received']['bits_per_second']) / 1024 / 1024
                            # save result file
                            with open('/mnt/station_ramdisk/wifi-iperf3.json', 'w') as outfile:
                                json.dump(data, outfile, indent=4)
                            outfile.close()
                            self.__resultlist.append(
                                {
                                    "description": "iperf3 output",
                                    "filepath": "/mnt/station_ramdisk/wifi-iperf3.json",
                                    "mimetype": "application/json"
                                }
                            )

                            # check if BW is in the expected range
                            if self.__bwreal < float(self.__bwexpected):
                                self.fail("failed: speed is lower than expected. Speed(Mbits/s): " + str(self.__bwreal))
                        else:
                            self.fail("failed: could not complete iperf3 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: could not execute iw command")

    def getresults(self):
        return self.__resultlist

    def gettextresult(self):
        return ""