import types
import errno
import paramiko
import sys
import time
from FiberHome import FiberHome
from Furukawa import Furukawa
from Huawei import Huawei
from ZTE import ZTE
from OLTBase import OLTBase
from ObjectConnection import ObjectConnection


class ObjectSsh(ObjectConnection):

    def __init__(self):
        ObjectConnection.__init__(self)
        self.stdin = None
        self.stdout = None

    def connect(self):
        """
        Connect by ssh to olt
        """
        if self.brand.upper() == ZTE.__name__.upper():
            self.olt = ZTE(self.model, False)
        elif self.brand.upper() == FiberHome.__name__.upper():
            self.olt = FiberHome(self.model, False)
        elif self.brand.upper() == Furukawa.__name__.upper():
            self.olt = Furukawa(self.model, False)
        elif self.brand.upper() == Huawei.__name__.upper():
            self.olt = Huawei(self.model, False)
        else:
            self.olt = OLTBase(None, False)
        ssh = paramiko.SSHClient()
        ssh.load_system_host_keys()
        ssh.set_missing_host_key_policy(paramiko.AutoAddPolicy())
        ssh.connect(hostname=self.hostname, port=self.port, username=self.user, password=self.password,
                    allow_agent=False, look_for_keys=False)
        chan = ssh.invoke_shell()
        self.stdin = chan.makefile('wb')
        self.stdout = chan.makefile('r')
        # wait to olt to initialice terminal
        self.read_data(self.olt.get_expected_initial())
        if self.file_name is not None:
            self.connection_file()
        elif self.data is not None:
            self.connection_data()
        else:
            self.connection_old()
        while self.QUIT:
            # send quit to terminal until exit confirmation
            self.command_quit(self.olt.get_write_exit())
        self.stdin.close()
        self.stdout.close()
        ssh.close()
        self.save_log()
        exit(self.RUN_OK)

    def command_enable(self, command):
        """
        Check's if the command is enable and execute then
        :param command:
        :return: Return True if enable otherwise False
        """
        if command.lower() == self.olt.get_write_enable().lower():
            if self.olt.run_enable():
                self.stdin.write(self.olt.get_write_enable() + self.NEW_LINE_UNIX)
                if self.olt.run_enable_password():
                    self.read_data(self.olt.get_expected_enable_password())
                    self.stdin.write(self.password_enable + self.NEW_LINE_UNIX)
                self.read_data(self.olt.get_expected_cardinal())
            return True
        return False

    def command_quit(self, command):
        """
        Check's if the command is quit and execute then
        :param command:
        :return: Return True if enable otherwise False
        """
        if command.lower() == self.olt.get_write_exit().lower():
            try:
                self.stdin.write(self.olt.get_write_exit() + self.NEW_LINE_UNIX)
                position = self.read_data([self.olt.get_expected_cardinal(), self.olt.get_expected_exit()])
                if position == 2:
                    # quit terminal
                    self.stdin.write(self.olt.get_write_exit_confirmation() + self.NEW_LINE_UNIX)
                    self.stdin.flush()
                    self.QUIT = False
            # except self.tn.error, e:
            except IOError, e:
                if e.errno == errno.EPIPE:
                    self.QUIT = False
            return True
        return False

    def command_execute(self, command, expected):
        """
        Check's the command
        :param command:
        :param expected: Expected string to stop listening
        """
        self.command_print(command)
        if not self.command_enable(command) and not self.command_quit(command):
            command = command.rstrip(self.NEW_LINE_WINDOWS).rstrip(self.NEW_LINE_UNIX)
            if command.__len__() > 0:
                self.stdin.write(command + self.NEW_LINE_UNIX)
                self.stdin.flush()
                self.read_data(expected)

    def read_data(self, character):
        """
        Read channel waiting parameter character
        :param character: The character
        """
        buffer_size = 1024
        all_data = ""
        stop = False
        position = 1
        if isinstance(character, types.StringType):
            character = [character]
        while not self.stdout.channel.exit_status_ready() and not stop:
            all_data += self.stdout.channel.recv(buffer_size)
            while self.stdout.channel.recv_ready():
                all_data += self.stdout.channel.recv(buffer_size)
            nc = 1
            for ch in character:
                if ch in all_data:
                    stop = True
                    position = nc
                    break
                nc += 1
        print(str(all_data))
        self.all_data = self.all_data + str(all_data)
        return position

    def connection_old(self):
        """
        Old method
        """
        while 1:
            line = sys.stdin.readline()
            if not line:
                break
            self.command_execute(line, self.olt.get_expected_cardinal())
            time.sleep(1)
            if not self.QUIT:
                return

    def connection_data(self):
        """
        Recive data separeted by ;
        """
        # $(sed ':a;N;$!ba;s/\n/;/g' file)
        content = self.data.split(";")
        for line in content:
            self.command_execute(line, self.olt.get_expected_cardinal())
            if not self.QUIT:
                return

    def connection_file(self):
        """
        Execute command from file
        """
        with open(self.file_name) as f:
            content = f.readlines()
            for line in content:
                self.command_execute(line, self.olt.get_expected_cardinal())
                if not self.QUIT:
                    return