#!/usr/bin/env python
"""
Created on 24-Oct-2012

author:s: Anil Kumar ( anilkumar.s@paxterrasolutions.com ),
          Raghav Kashyap( raghavkashyap@paxterrasolutions.com )


    TestON is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 2 of the License, or
    ( at your option ) any later version.

    TestON is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with TestON.  If not, see <http://www.gnu.org/licenses/>.


"""
import pexpect
import struct
import fcntl
import os
import sys
import signal
import sys
import re
sys.path.append( "../" )

from drivers.component import Component


class CLI( Component ):

    """
        This will define common functions for CLI included.
    """
    def __init__( self ):
        super( Component, self ).__init__()

    def connect( self, **connectargs ):
        """
           Connection will establish to the remote host using ssh.
           It will take user_name ,ip_address and password as arguments<br>
           and will return the handle.
        """
        for key in connectargs:
            vars( self )[ key ] = connectargs[ key ]

        connect_result = super( CLI, self ).connect()
        ssh_newkey = 'Are you sure you want to continue connecting'
        refused = "ssh: connect to host " + \
            self.ip_address + " port 22: Connection refused"
        if self.port:
            self.handle = pexpect.spawn(
                'ssh -p ' +
                self.port +
                ' ' +
                self.user_name +
                '@' +
                self.ip_address,
                env={ "TERM": "xterm-mono" },
                maxread=50000 )
        else:
            self.handle = pexpect.spawn(
                'ssh -X ' +
                self.user_name +
                '@' +
                self.ip_address,
                env={ "TERM": "xterm-mono" },
                maxread=1000000,
                timeout=60 )

        self.handle.logfile = self.logfile_handler
        i = 5
        while i == 5:
            i = self.handle.expect( [
                                    ssh_newkey,
                                    'password:|Password:',
                                    pexpect.EOF,
                                    pexpect.TIMEOUT,
                                    refused,
                                    'teston>',
                                    '>|#|\$' ],
                		    120 )
            if i == 0:  #Accept key, then expect either a password prompt or access 
                main.log.info( "ssh key confirmation received, send yes" )
                self.handle.sendline( 'yes' )
                i = 5  #Run the loop again 
                continue 
            if i == 1:
                if self.pwd:
                    main.log.info(
                        "ssh connection asked for password, gave password" )
                    self.handle.sendline( self.pwd )
                    self.handle.expect( '>|#|\$' )
                else:
                    # FIXME: TestON does not support a username having no
                    #        password
                    main.log.error( "Server asked for password, but none was "
                                    "given in the .topo file" )
                    main.exit()
            elif i == 2:
                main.log.error( "Connection timeout" )
                return main.FALSE
            elif i == 3:  # timeout
                main.log.error(
                    "No route to the Host " +
                    self.user_name +
                    "@" +
                    self.ip_address )
                return main.FALSE
            elif i == 4:
                main.log.error(
                    "ssh: connect to host " +
                    self.ip_address +
                    " port 22: Connection refused" )
                return main.FALSE
            elif i == 6:
                main.log.info( "Password not required logged in" )

        self.handle.sendline( "" )
        self.handle.expect( '>|#|\$' )
        return self.handle

    def disconnect( self ):
        result = super( CLI, self ).disconnect( self )
        result = main.TRUE
        # self.execute( cmd="exit",timeout=120,prompt="(.*)" )

    def execute( self, **execparams ):
        """
        It facilitates the command line execution of a given command. It has arguments as :
        cmd => represents command to be executed,
        prompt => represents expect command prompt or output,
        timeout => timeout for command execution,
        more => to provide a key press if it is on.

        It will return output of command exection.
        """
        result = super( CLI, self ).execute( self )
        defaultPrompt = '.*[$>\#]'
        args = utilities.parse_args( [
				     "CMD",
                                     "TIMEOUT",
                                     "PROMPT",
                                     "MORE" ],
            			     **execparams )

        expectPrompt = args[ "PROMPT" ] if args[ "PROMPT" ] else defaultPrompt
        self.LASTRSP = ""
        timeoutVar = args[ "TIMEOUT" ] if args[ "TIMEOUT" ] else 10
        cmd = ''
        if args[ "CMD" ]:
            cmd = args[ "CMD" ]
        else:
            return 0
        if args[ "MORE" ] is None:
            args[ "MORE" ] = " "
        self.handle.sendline( cmd )
        self.lastCommand = cmd
        index = self.handle.expect( [
				    expectPrompt,
                                    "--More--",
                                    'Command not found.',
                                    pexpect.TIMEOUT,
                                    "^:$" ],
            			    timeout=timeoutVar )
        if index == 0:
            self.LASTRSP = self.LASTRSP + \
                self.handle.before + self.handle.after
            main.log.info(
                "Executed :" + str(
                    cmd ) + " \t\t Expected Prompt '" + str(
                        expectPrompt) + "' Found" )
        elif index == 1:
            self.LASTRSP = self.LASTRSP + self.handle.before
            self.handle.send( args[ "MORE" ] )
            main.log.info(
                "Found More screen to go , Sending a key to proceed" )
            indexMore = self.handle.expect(
                [ "--More--", expectPrompt ], timeout=timeoutVar )
            while indexMore == 0:
                main.log.info(
                    "Found anoother More screen to go , Sending a key to proceed" )
                self.handle.send( args[ "MORE" ] )
                indexMore = self.handle.expect(
                    [ "--More--", expectPrompt ], timeout=timeoutVar )
                self.LASTRSP = self.LASTRSP + self.handle.before
        elif index == 2:
            main.log.error( "Command not found" )
            self.LASTRSP = self.LASTRSP + self.handle.before
        elif index == 3:
            main.log.error( "Expected Prompt not found , Time Out!!" )
            main.log.error( expectPrompt )
            return "Expected Prompt not found , Time Out!!"

        elif index == 4:
            self.LASTRSP = self.LASTRSP + self.handle.before
            # self.handle.send( args[ "MORE" ] )
            self.handle.sendcontrol( "D" )
            main.log.info(
                "Found More screen to go , Sending a key to proceed" )
            indexMore = self.handle.expect(
                [ "^:$", expectPrompt ], timeout=timeoutVar )
            while indexMore == 0:
                main.log.info(
                    "Found another More screen to go , Sending a key to proceed" )
                self.handle.sendcontrol( "D" )
                indexMore = self.handle.expect(
                    [ "^:$", expectPrompt ], timeout=timeoutVar )
                self.LASTRSP = self.LASTRSP + self.handle.before

        main.last_response = self.remove_contol_chars( self.LASTRSP )
        return self.LASTRSP

    def remove_contol_chars( self, response ):
        # RE_XML_ILLEGAL = '([\u0000-\u0008\u000b-\u000c\u000e-\u001f\ufffe-\uffff])|([%s-%s][^%s-%s])|([^%s-%s][%s-%s])|([%s-%s]$)|(^[%s-%s])'%( unichr( 0xd800 ),unichr( 0xdbff ),unichr( 0xdc00 ),unichr( 0xdfff ),unichr( 0xd800 ),unichr( 0xdbff ),unichr( 0xdc00 ),unichr( 0xdfff ),unichr( 0xd800 ),unichr( 0xdbff ),unichr( 0xdc00 ),unichr( 0xdfff ) )
        # response = re.sub( RE_XML_ILLEGAL, "\n", response )
        response = re.sub( r"[\x01-\x1F\x7F]", "", response )
        # response = re.sub( r"\[\d+\;1H", "\n", response )
        response = re.sub( r"\[\d+\;\d+H", "", response )
        return response

    def runAsSudoUser( self, handle, pwd, default ):

        i = handle.expect( [ ".ssword:*", default, pexpect.EOF ] )
        if i == 0:
            handle.sendline( pwd )
            handle.sendline( "\r" )

        if i == 1:
            handle.expect( default )

        if i == 2:
            main.log.error( "Unable to run as Sudo user" )

        return handle

    def onfail( self ):
        if 'onfail' in main.componentDictionary[ self.name ]:
            commandList = main.componentDictionary[
                self.name ][ 'onfail' ].split( "," )
            for command in commandList:
                response = self.execute(
                    cmd=command,
                    prompt="(.*)",
                    timeout=120 )

    def secureCopy( self, user_name, ip_address, filepath, pwd, dst_path ):

        # scp openflow@192.168.56.101:/home/openflow/sample
        # /home/paxterra/Desktop/
        """
           Connection will establish to the remote host using ssh.
           It will take user_name ,ip_address and password as arguments<br>
           and will return the handle.
        """
        ssh_newkey = 'Are you sure you want to continue connecting'
        refused = "ssh: connect to host " + \
            ip_address + " port 22: Connection refused"
        
	cmd = 'scp ' + str( user_name ) + '@' + str( ip_address ) + ':' + \
	      str( filepath ) + ' ' + str(dst_path )

        main.log.info( "Sending: " + cmd )
        self.handle = pexpect.spawn( cmd )
        i = self.handle.expect( [
				ssh_newkey,
                              	'password:',
                              	pexpect.EOF,
                              	pexpect.TIMEOUT,
                              	refused ],
            			120 )

        if i == 0:
            main.log.info( "ssh key confirmation received, send yes" )
            self.handle.sendline( 'yes' )
            i = self.handle.expect( [ ssh_newkey, 'password:', pexpect.EOF ] )
        if i == 1:
            main.log.info( "ssh connection asked for password, gave password" )
            self.handle.sendline( pwd )
            # self.handle.expect( user_name )

        elif i == 2:
            main.log.error( "Connection timeout" )
            pass
        elif i == 3:  # timeout
            main.log.error(
                "No route to the Host " +
                user_name +
                "@" +
                ip_address )
            return main.FALSE
        elif i == 4:
            main.log.error(
                "ssh: connect to host " +
                ip_address +
                " port 22: Connection refused" )
            return main.FALSE

        self.handle.sendline( "" )
        self.handle.expect( "$" )
        print self.handle.before

        return self.handle