#!/usr/bin/python3.7
"""Programmatically configure Aviat INUes using their undocumented protocol."""

# import os
import sys
from dataclasses import dataclass
# import socket
import telnetlib
import csv
import threading
import argparse
try:
    import queue
except ImportError:
    import Queue as queue

PORT = 26000
NEXT = 1
WORKERS = 5

NET_MASK = "255.255.0.0"
GATEWAY = "10.250.0.0.255.255.0.0.0.172.16.0.1"
OLD_SUBNET = "192.168"
NEW_SUBNET = "172.16"
VLAN = 4095

ARG_PARSER = argparse.ArgumentParser(
    description='Scriptable configuration of Aviat Eclipse INUes.')
ARG_PARSER.add_argument('csv')

@dataclass
class INUeCommand():
    """Command to be sent to an INUe, including the context and possible value"""
    context: str
    command: str
    position: int = 0
    value: int = None
    reverse: bool = False

    def __post_init__(self):
        if self.reverse:
            self.position, self.value = self.value, self.position

    def get_context(self):
        """Get the context of the command, ready to send."""
        print ("contextid %s\n" % self.context).encode('ascii')
        return ("contextid %s\n" % self.context).encode('ascii')

    def get_command(self):
        """Get the command, as either a get or set, based on the value."""
        if self.value:
            return ('set %s %s %s\n' % (self.command, self.position, self.value)).encode('ascii')
        else:
            return ('get %s %s\n' % (self.command, self.position)).encode('ascii')

def send_config(telnet, inue_command):
    """Send a config command to an INUe via a supplied telnet connection."""
    # telnet.write(("contextid %s\n" % context).encode('ascii'))
    telnet.write(inue_command.get_context())
    telnet.read_until(b'Command Executed.  Status unknown.\n')

    # if inue_command.value:
    #     telnet.write(('set %s %s %s\n' %
    #                   (command, position, value)).encode('ascii'))
    # else:
    #     telnet.write(('get %s %s\n' % (command, position)).encode('ascii'))
    telnet.write(inue_command.get_command())
    response = telnet.read_until(b'\n').split()
    if response[0].decode() == inue_command.command:
        return response[-1]
    else:
        return False


def commit_save(telnet):
    """Save and commit the config changes, via a supplied telnet connection."""
    send_config(telnet, INUeCommand("Terminal_I", "configCommitSave", 0, 1))
    send_config(telnet, INUeCommand("Terminal_I", "configCommitSwitch", 0, 1))
    # send_config(telnet, "Terminal_I", "configCommitSave", 0, 1)
    # send_config(telnet, "Terminal_I", "configCommitSwitch", 0, 1)


class Worker(threading.Thread):
    """Class for worker threads which will process INUEs."""

    def __init__(self, inues, passed, failed):
        self.__inues = inues
        self.__passed = passed
        self.__failed = failed
        threading.Thread.__init__(self)

    def run(self):
        while True:
            inue = self.__inues.get()
            if inue is None:
                print('Here')
                self.__passed.put(None)
                self.__failed.put(None)
                break

            new_ip = inue.replace(OLD_SUBNET, NEW_SUBNET)

            rstp_dac = 0

            try:
                with telnetlib.Telnet(inue, PORT) as telnet:
                    for slot in range(1, 9):
                        if send_config(telnet,
                                       INUeCommand("Slot%s_I" % slot, "ceConfigBridgeStpMode")):
                            rstp_dac = slot

                    if not rstp_dac:
                        self.__failed.put(inue)
                        continue

                commands = [
                    INUeCommand("Slot%s_I" % slot, "ceConfigNmsVid", 0, VLAN),
                    INUeCommand("Terminal_I", "ipConfigAdEntAddress", slot + 1, new_ip),
                    INUeCommand("Terminal_I", "ipConfigAdEntelnetET_MASK", slot + 1, NET_MASK),
                    INUeCommand("Terminal_I", "ipConfigAutoroutingOspfEnable", slot + 1, 2),
                    INUeCommand("Terminal_I", "ipCidrRouteIfIndex", slot + 48, GATEWAY, True),
                ]

                fail = False

                for command in commands:
                    if not send_config(telnet, command):
                        self.__failed.put(inue)
                        fail = True
                        continue

                if fail:
                    continue

                commit_save(telnet)

            except OSError:
                self.__failed.put(inue)
                continue

            try:
                with telnetlib.Telnet(new_ip, PORT) as telnet:
                    self.__passed.put(new_ip)
            except OSError:
                FAILED_QUEUE.put(inue)
                continue


def input_inues():
    """Load list of INUEs from CSV file."""
    with open(INFILEPATH, 'r', newline='') as in_file:
        csv_reader = csv.DictReader(in_file)

        for row in csv_reader:
            INUE_QUEUE.put(row['IP Address'])
        in_file.close()

    #pylint: disable=unused-variable,redefined-outer-name
    for worker in range(WORKERS):
        INUE_QUEUE.put(None)


def failed_output():
    """Output a list of failed INUEs to standard out."""
    count = WORKERS

    # with open('/tmp/sc200.csv', 'w', newline='') as outFile:
    #     csvWriter = csv.DictWriter(outFile, fieldnames=fieldNames,
    #         delimiter=',', quotechar='"',
    #         quoting=csv.QUOTE_MINIMAL)

    #     csvWriter.writeheader()

    print('Failed:')

    while 1:
        inue = FAILED_QUEUE.get()
        if inue is None:
            if count > 1:
                count -= 1
                # print(Count)
            else:
                break
        else:
            print(inue)


def passed_output():
    """Output a list of successfully modified INUes into a CSV file."""
    count = WORKERS

    field_names = ['IP Address']
    with open('/tmp/aviat.csv', 'w', newline='') as out_file:
        csv_writer = csv.DictWriter(out_file, fieldnames=field_names,
                                    delimiter=',', quotechar='"',
                                    quoting=csv.QUOTE_MINIMAL)

        csv_writer.writeheader()

        while 1:
            inue = PASSED_QUEUE.get()
            if inue is None:
                if count > 1:
                    count -= 1
                else:
                    break
            else:
                csv_writer.writerow({"IP Address": inue})

        out_file.close()


INUE_QUEUE = queue.Queue(0)
PASSED_QUEUE = queue.Queue(0)
FAILED_QUEUE = queue.Queue(0)

# for i in range(WORKERS):
#    Worker(INUE_QUEUE, PASSED_QUEUE, FAILED_QUEUE).start()

# for INUE in sys.argv:
#   if NEXT:
#     NEXT=0
#   else:
#     INUE_QUEUE.put(INUE)

# for i in range(WORKERS):
#   INUE_QUEUE.put(None)

INFILEPATH = sys.argv[1]

input_inues()

for worker in range(WORKERS):
    Worker(INUE_QUEUE, PASSED_QUEUE, FAILED_QUEUE).start()

if threading.current_thread() is not threading.main_thread():
    sys.exit(0)

passed_output()
failed_output()

sys.exit(0)