#!/usr/bin/env python
"""
Created on 24-Oct-2012
Copyright 2012 Open Networking Foundation (ONF)

Please refer questions to either the onos test mailing list at <onos-test@onosproject.org>,
the System Testing Plans and Results wiki page at <https://wiki.onosproject.org/x/voMg>,
or the System Testing Guide page at <https://wiki.onosproject.org/x/WYQg>

    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 re

from drivers.component import Component


class CLI( Component ):

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

    def checkPrompt( self ):
        for key in self.options:
            if key == "prompt" and self.options[ 'prompt' ] is not None:
                self.prompt = self.options[ 'prompt' ]
                break

    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 ]
        self.checkPrompt()

        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 -X -p ' +
                self.port +
                ' ' +
                self.user_name +
                '@' +
                self.ip_address +
                ' -o ServerAliveInterval=120 -o TCPKeepAlive=yes',
                env={ "TERM": "vt100" },
                maxread=1000000 )
        else:
            self.handle = pexpect.spawn(
                'ssh -X ' +
                self.user_name +
                '@' +
                self.ip_address +
                ' -o ServerAliveInterval=120 -o TCPKeepAlive=yes',
                env={ "TERM": "vt100" },
                maxread=1000000,
                timeout=60 )

        # set tty window size
        self.handle.setwinsize( 24, 250 )

        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>',
                                      'Permission denied, please try again.',
                                      self.prompt ],
                                    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:  # Password required
                if self.pwd:
                    main.log.info(
                            "ssh connection asked for password, gave password" )
                else:
                    main.log.info( "Server asked for password, but none was "
                                    "given in the .topo file. Trying "
                                    "no password." )
                    self.pwd = ""
                self.handle.sendline( self.pwd )
                j = self.handle.expect( [
                                        'password:|Password:',
                                        'Permission denied, please try again.',
                                        self.prompt,
                                        pexpect.EOF,
                                        pexpect.TIMEOUT ],
                                        120 )
                if j != 2:
                    main.log.error( "Incorrect Password" )
                    return main.FALSE
            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:  # Incorrect Password
                main.log.error( "Incorrect Password" )
                return main.FALSE
            elif i == 7:  # Prompt
                main.log.info( "Password not required logged in" )

        self.handle.sendline( "" )
        self.handle.expect( self.prompt )
        self.handle.sendline( "cd" )
        self.handle.expect( self.prompt )
        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.
        logCmd => log the command executed if True

        It will return output of command exection.
        """
        result = super( CLI, self ).execute( self )
        defaultPrompt = '.*[$>\#]'
        args = utilities.parse_args( [ "CMD",
                                       "TIMEOUT",
                                       "PROMPT",
                                       "MORE",
                                       "LOGCMD" ],
                                     **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,
                                      "^:$" ],
                                    timeout=timeoutVar )
        if index == 0:
            self.LASTRSP = self.LASTRSP + \
                self.handle.before + self.handle.after
            if not args[ "LOGCMD" ] is False:
                main.log.info( "Executed :" + str( cmd ) +
                               " \t\t Expected Prompt '" + str( expectPrompt ) +
                               "' Found" )
        elif index == 1:
            self.LASTRSP = self.LASTRSP + self.handle.before
            self.handle.send( args[ "MORE" ] )
            main.log.info(
                "Found More screen to go , Sending a key to proceed" )
            indexMore = self.handle.expect(
                [ "--More--", expectPrompt ], timeout=timeoutVar )
            while indexMore == 0:
                main.log.info(
                    "Found anoother More screen to go , Sending a key to proceed" )
                self.handle.send( args[ "MORE" ] )
                indexMore = self.handle.expect(
                    [ "--More--", expectPrompt ], timeout=timeoutVar )
                self.LASTRSP = self.LASTRSP + self.handle.before
        elif index == 2:
            main.log.error( "Command not found" )
            self.LASTRSP = self.LASTRSP + self.handle.before
        elif index == 3:
            main.log.error( "Expected Prompt not found, Time Out!!" )
            main.log.error( expectPrompt )
            self.LASTRSP = self.LASTRSP + self.handle.before
            return self.LASTRSP
        elif index == 4:
            self.LASTRSP = self.LASTRSP + self.handle.before
            # self.handle.send( args[ "MORE" ] )
            self.handle.sendcontrol( "D" )
            main.log.info(
                "Found More screen to go, Sending a key to proceed" )
            indexMore = self.handle.expect(
                [ "^:$", 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( "\n" )

        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, userName, ipAddress, filePath, dstPath, pwd="",
                    direction="from" ):
        """
        Definition:
            Execute scp command in linux to copy to/from a remote host
        Required:
            str userName - User name of the remote host
            str ipAddress - IP address of the remote host
            str filePath - File path including the file it self
            str dstPath - Destination path
        Optional:
            str pwd - Password of the host
            str direction - Direction of the scp, default to "from" which means
                            copy "from" the remote machine to local machine,
                            while "to" means copy "to" the remote machine from
                            local machine
        """
        returnVal = main.TRUE
        ssh_newkey = 'Are you sure you want to continue connecting'
        refused = "ssh: connect to host " + \
                  ipAddress + " port 22: Connection refused"

        if direction == "from":
            cmd = 'scp ' + str( userName ) + '@' + str( ipAddress ) + ':' + \
                  str( filePath ) + ' ' + str( dstPath )
        elif direction == "to":
            cmd = 'scp ' + str( filePath ) + ' ' + str( userName ) + \
                  '@' + str( ipAddress ) + ':' + str( dstPath )
        else:
            main.log.debug( "Wrong direction using secure copy command!" )
            return main.FALSE

        main.log.info( "Sending: " + cmd )
        self.handle.sendline( cmd )
        i = 0
        while i < 2:
            i = self.handle.expect( [
                                ssh_newkey,
                                'password:',
                                "100%",
                                refused,
                                "No such file or directory",
                                "Permission denied",
                                self.prompt,
                                pexpect.EOF,
                                pexpect.TIMEOUT ],
                                120 )
            if i == 0:  # ask for ssh key confirmation
                main.log.info( "ssh key confirmation received, sending yes" )
                self.handle.sendline( 'yes' )
            elif i == 1:  # Asked for ssh password
                main.log.info( "ssh connection asked for password, gave password" )
                self.handle.sendline( pwd )
            elif i == 2:  # File finished transfering
                main.log.info( "Secure copy successful" )
                returnVal = main.TRUE
            elif i == 3:  # Connection refused
                main.log.error(
                    "ssh: connect to host " +
                    ipAddress +
                    " port 22: Connection refused" )
                returnVal = main.FALSE
            elif i == 4:  # File Not found
                main.log.error( "No such file found" )
                returnVal = main.FALSE
            elif i == 5:  # Permission denied
                main.log.error( "Permission denied. Check folder permissions" )
                returnVal = main.FALSE
            elif i == 6:  # prompt returned
                return returnVal
            elif i == 7:  # EOF
                main.log.error( "Pexpect.EOF found!!!" )
                main.cleanAndExit()
            elif i == 8:  # timeout
                main.log.error(
                    "No route to the Host " +
                    userName +
                    "@" +
                    ipAddress )
                returnVal = main.FALSE
        self.handle.expect( self.prompt )
        return returnVal

    def scp( self, remoteHost, filePath, dstPath, direction="from" ):
        """
        Definition:
            Execute scp command in linux to copy to/from a remote host
        Required:
            * remoteHost - Test ON component to be parsed
            str filePath - File path including the file it self
            str dstPath - Destination path
        Optional:
            str direction - Direction of the scp, default to "from" which means
                            copy "from" the remote machine to local machine,
                            while "to" means copy "to" the remote machine from
                            local machine
        """
        return self.secureCopy( remoteHost.user_name,
                                remoteHost.ip_address,
                                filePath,
                                dstPath,
                                pwd=remoteHost.pwd,
                                direction=direction )

    def sshToNode( self, ipAddress, uName="sdn", pwd="rocks" ):
        ssh_newkey = 'Are you sure you want to continue connecting'
        refused = "ssh: connect to host " + ipAddress + " port 22: Connection refused"
        handle = pexpect.spawn( 'ssh -X ' +
                                uName +
                                '@' +
                                ipAddress,
                                env={ "TERM": "vt100" },
                                maxread=1000000,
                                timeout=60 )

        # set tty window size
        handle.setwinsize( 24, 250 )

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

        handle.sendline( "" )
        handle.expect( self.prompt )
        handle.sendline( "cd" )
        handle.expect( self.prompt )

        main.log.info( "Successfully ssh to " + ipAddress + "." )
        return handle

    def exitFromSsh( self, handle, ipAddress ):
        try:
            handle.sendline( "logout" )
            handle.expect( "closed." )
            main.log.info( "Successfully closed ssh connection from " + ipAddress )
        except pexpect.EOF:
            main.log.error( "Failed to close the connection from " + ipAddress )
        try:
            # check that this component handle still works
            self.handle.sendline( "" )
            self.handle.expect( self.prompt )
        except pexpect.EOF:
            main.log.error( self.handle.before )
            main.log.error( "EOF after closing ssh connection" )

    def folderSize( self, path, size='10', unit='M', ignoreRoot=True ):
        """
        Run `du -h` on the folder path and verifies the folder(s) size is
        less than the given size. Note that if multiple subdirectories are
        present, the result will be the OR of all the individual subdirectories.

        Arguments:
        path - A string containing the path supplied to the du command
        size - The number portion of the file size that the results will be compared to
        unit - The unit portion of the file size that the results will be compared to
        ignoreRoot - If True, will ignore the "root" of the path supplied to du. I.E. will ignore `.`

        Returns True if the folder(s) size(s) are less than SIZE UNITS, else returns False
        """
        sizeRe = r'(?P<number>\d+\.*\d*)(?P<unit>\D)'
        unitsList = [ 'K', 'M', 'G', 'T', 'P', 'E', 'Z', 'Y' ]
        try:
            # make sure we convert units if size is too big
            size = float( size )
            if size >= 1000:
                size = size / 1000
                unit = unitsList[ unitsList.index( unit + 1 ) ]
            cmdStr = "du -h " + path
            self.handle.sendline( cmdStr )
            self.handle.expect( self.prompt )
            output = self.handle.before
            assert "cannot access" not in output
            assert "command not found" not in output
            main.log.debug( output )
            lines = [ line for line in output.split( '\r\n' ) ]
            retValue = True
            if ignoreRoot:
                lastIndex = -2
            else:
                lastIndex = -1
            for line in lines[ 1:lastIndex ]:
                parsed = line.split()
                sizeMatch = parsed[ 0 ]
                folder = parsed[ 1 ]
                match = re.search( sizeRe, sizeMatch )
                num = match.group( 'number' )
                unitMatch = match.group( 'unit' )
                if unitsList.index( unitMatch ) < unitsList.index( unit ):
                    retValue &= True
                elif unitsList.index( unitMatch ) == unitsList.index( unit ):
                    if float( num ) < float( size ):
                        retValue &= True
                    else:
                        retValue &= False
                elif unitsList.index( unitMatch ) > unitsList.index( unit ):
                    retValue &= False
            return retValue
        except AssertionError:
            main.log.error( self.name + ": Could not execute command: " + output )
            return False
        except ValueError as e:
            main.log.error( self.name + ": Error parsing output: " + output )
            main.log.error( e )
            return False
        except pexpect.TIMEOUT:
            main.log.exception( self.name + ": TIMEOUT exception found" )
            main.log.error( self.name + ":    " + self.handle.before )
            return False
        except pexpect.EOF:
            main.log.error( self.name + ": EOF exception found" )
            main.log.error( self.name + ":    " + self.handle.before )
            main.cleanAndExit()

    def setEnv( self, variable, value=None ):
        """
        Sets the environment variable to the given value for the current shell session.
        If value is None, will unset the variable.

        Required Arguments:
        variable - The name of the environment variable to set.

        Optional Arguments:
        value - The value to set the variable to. ( Defaults to None, which unsets the variable )

        Returns True if no errors are detected else returns False
        """
        try:
            if value:
                cmd = "export {}={}".format( variable, value )
            else:
                cmd = "unset {}".format( variable )
            self.handle.sendline( cmd )
            self.handle.expect( self.prompt )
            main.log.debug( self.handle.before )
            return True
        except AssertionError:
            main.log.error( self.name + ": Could not execute command: " + output )
            return False
        except pexpect.TIMEOUT:
            main.log.exception( self.name + ": TIMEOUT exception found" )
            main.log.error( self.name + ":    " + self.handle.before )
            return False
        except pexpect.EOF:
            main.log.error( self.name + ": EOF exception found" )
            main.log.error( self.name + ":    " + self.handle.before )
            main.cleanAndExit()

    def exitFromCmd( self, expect, retry=10 ):
        """
        Call this function when sending ctrl+c is required to kill the current
        command. It will retry multiple times until the running command is
        completely killed and expected string is returned from the handle.
        Required:
            expect: expected string or list of strings which indicates that the
                    previous command was killed successfully.
        Optional:
            retry: maximum number of ctrl+c that will be sent.
        """
        expect = [ expect ] if isinstance( expect, str ) else expect
        try:
            while retry >= 0:
                main.log.debug( self.name + ": sending ctrl+c to kill the command" )
                self.handle.send( "\x03" )
                i = self.handle.expect( expect + [ pexpect.TIMEOUT ], timeout=3 )
                main.log.debug( self.handle.before )
                if i < len( expect ):
                    main.log.debug( self.name + ": successfully killed the command" )
                    return main.TRUE
                retry -= 1
            main.log.warn( self.name + ": failed to kill the command" )
            return main.FALSE
        except pexpect.EOF:
            main.log.error( self.name + ": EOF exception found" )
            main.log.error( self.name + ":     " + self.handle.before )
            return main.FALSE
        except Exception:
            main.log.exception( self.name + ": Uncaught exception!" )
            return main.FALSE

    def cleanOutput( self, output, debug=False ):
        """
        Clean ANSI characters from output
        """
        ansiEscape = re.compile(r'\x1B(?:[@-Z\\-_]|\[[0-?]*[ -/]*[@-~])')
        cleaned = ansiEscape.sub( '', output )
        if debug:
            main.log.debug( self.name + ": cleanOutput:" )
            main.log.debug( self.name + ": " + repr( cleaned ) )
        return cleaned