"""
Copyright 2017 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/>.
"""

"""
Testing various connectivity failures for VPLS.

CASE1: Startup.
CASE2: Load VPLS topology and configurations from demo script.
CASE50: Initial connectivity test.
CASE100: Bring down 1 host at a time and test connectivity.
CASE200: Bring down 1 switch at a time and test connectivity.
CASE300: Stop 1 ONOS node at a time and test connectivity.
CASE310: Kill 1 ONOS node at a time and test connectivity.
CASE400: Bring down 1 link at a time and test connectivity.
"""

class VPLSfailsafe:

    def __init__( self ):
        self.default = ''


    def CASE1( self, main ):
        """
        CASE1 is to compile ONOS and push it to the test machines

        Startup sequence:
        cell <name>
        onos-verify-cell
        NOTE: temporary - onos-remove-raft-logs
        onos-uninstall
        start mininet
        git pull
        mvn clean install
        onos-package
        onos-install -f
        onos-wait-for-start
        start cli sessions
        start tcpdump
        """
        import imp
        import time
        import json
        try:
            from tests.dependencies.ONOSSetup import ONOSSetup
            main.testSetUp = ONOSSetup()
        except ImportError:
            main.log.error( "ONOSSetup not found. exiting the test" )
            main.cleanAndExit()
        main.testSetUp.envSetupDescription()
        stepResult = main.FALSE
        try:
            # load some variables from the params file
            cellName = main.params[ 'ENV' ][ 'cellName' ]
            main.timeSleep = int( main.params[ 'RETRY' ][ 'sleep' ] )
            main.numAttempts = int( main.params[ 'RETRY' ][ 'attempts' ] )
            main.apps = main.params[ 'ENV' ][ 'cellApps' ]

            ofPort = main.params[ 'CTRL' ][ 'port' ]
            stepResult = main.testSetUp.envSetup()
        except Exception as e:
            main.testSetUp.envSetupException( e )
        main.testSetUp.evnSetupConclusion( stepResult )

        main.testSetUp.ONOSSetUp( main.Mininet1, main.Cluster,
                                  cellName=cellName )

        main.step( "Starting Mininet" )
        # scp topo file to mininet
        # TODO: move to params?
        topoName = "vpls"
        topoFile = "vpls.py"
        filePath = main.ONOSbench.home + "/tools/test/topos/"
        main.ONOSbench.scp( main.Mininet1,
                            filePath + topoFile,
                            main.Mininet1.home,
                            direction="to" )
        topo = " --custom " + main.Mininet1.home + topoFile + " --topo " + topoName
        args = " --switch ovs,protocols=OpenFlow13"
        for ctrl in main.Cluster.active():
            args += " --controller=remote,ip=" + ctrl.ipAddress
        mnCmd = "sudo mn" + topo + args
        mnResult = main.Mininet1.startNet( mnCmd=mnCmd )
        utilities.assert_equals( expect=main.TRUE, actual=mnResult,
                                 onpass="Mininet Started",
                                 onfail="Error starting Mininet" )


        main.step( "Activate apps defined in the params file" )
        # get data from the params
        apps = main.params.get( 'apps' )
        if apps:
            apps = apps.split( ',' )
            main.log.warn( apps )
            activateResult = True
            for app in apps:
                main.Cluster.active( 0 ).CLI.app( app, "Activate" )
            # TODO: check this worked
            time.sleep( SLEEP )  # wait for apps to activate
            for app in apps:
                state = main.Cluster.active( 0 ).CLI.appStatus( app )
                if state == "ACTIVE":
                    activateResult = activateResult and True
                else:
                    main.log.error( "{} is in {} state".format( app, state ) )
                    activateResult = False
            utilities.assert_equals( expect=True,
                                     actual=activateResult,
                                     onpass="Successfully activated apps",
                                     onfail="Failed to activate apps" )
        else:
            main.log.warn( "No apps were specified to be loaded after startup" )

        main.step( "Set ONOS configurations" )
        config = main.params.get( 'ONOS_Configuration' )
        if config:
            main.log.debug( config )
            checkResult = main.TRUE
            for component in config:
                for setting in config[ component ]:
                    value = config[ component ][ setting ]
                    check = main.Cluster.active( 0 ).CLI.setCfg( component, setting, value )
                    main.log.info( "Value was changed? {}".format( main.TRUE == check ) )
                    checkResult = check and checkResult
            utilities.assert_equals( expect=main.TRUE,
                                     actual=checkResult,
                                     onpass="Successfully set config",
                                     onfail="Failed to set config" )
        else:
            main.log.warn( "No configurations were specified to be changed after startup" )

        main.step( "App Ids check" )
        appCheck = main.Cluster.command( "appToIDCheck", returnBool=True )
        if appCheck != True:
            main.log.warn( main.Cluster.active( 0 ).CLI.apps() )
            main.log.warn( main.Cluster.active( 0 ).CLI.appIDs() )
        utilities.assert_equals( expect=True, actual=appCheck,
                                 onpass="App Ids seem to be correct",
                                 onfail="Something is wrong with app Ids" )

    def CASE2( self, main ):
        """
        Load and test vpls configurations from json configuration file
        """
        import os.path
        from tests.USECASE.VPLS.dependencies import vpls

        main.vpls = vpls
        pprint = main.ONOSrest1.pprint
        hosts = int( main.params[ 'vpls' ][ 'hosts' ] )
        SLEEP = int( main.params[ 'SLEEP' ][ 'netcfg' ] )

        main.step( "Discover hosts using pings" )
        for i in range( 1, hosts + 1 ):
            src = "h" + str( i )
            for j in range( 1, hosts + 1 ):
                if j == i:
                    continue
                dst = "h" + str( j )
            pingResult = main.Mininet1.pingHost( SRC=src, TARGET=dst )

        main.step( "Load VPLS configurations" )
        fileName = main.params[ 'DEPENDENCY' ][ 'topology' ]
        app = main.params[ 'vpls' ][ 'name' ]

        loadVPLSResult = main.ONOSbench.onosNetCfg( main.Cluster.active( 0 ).ipAddress, "", fileName )
        utilities.assert_equals( expect=main.TRUE,
                                 actual=loadVPLSResult,
                                 onpass="Loaded vpls configuration.",
                                 onfail="Failed to load vpls configuration.")

        # Time for netcfg to load data
        time.sleep( SLEEP )

        main.step( "Check VPLS configurations" )
        # 'Master' copy of test configuration
        try:
            with open( os.path.expanduser( fileName ) ) as dataFile:
                originalCfg = json.load( dataFile )
                main.vplsConfig = originalCfg[ 'apps' ].get( app ).get( 'vpls' ).get( 'vplsList' )
        except Exception as e:
            main.log.error( "Error loading config file: {}".format( e ) )
        if main.vplsConfig:
            result = True
        else:
            result = False
        utilities.assert_equals( expect=True,
                                 actual=result,
                                 onpass="Check vpls configuration succeeded.",
                                 onfail="Check vpls configuration failed." )

        main.step( "Check interface configurations" )
        result = False
        getPorts = utilities.retry( f=main.ONOSrest1.getNetCfg,
                                    retValue=False,
                                    kwargs={ "subjectClass" : "ports" },
                                    sleep=SLEEP )
        onosCfg = pprint( getPorts )
        sentCfg = pprint( originalCfg.get( "ports" ) )

        if onosCfg == sentCfg:
            main.log.info( "ONOS interfaces NetCfg matches what was sent" )
            result = True
        else:
            main.log.error( "ONOS interfaces NetCfg doesn't match what was sent" )
            main.log.debug( "ONOS config: {}".format( onosCfg ) )
            main.log.debug( "Sent config: {}".format( sentCfg ) )
        utilities.assert_equals( expect=True,
                                 actual=result,
                                 onpass="Net Cfg added for interfaces",
                                 onfail="Net Cfg not added for interfaces" )

        # Run a bunch of checks to verify functionality based on configs
        vpls.verify( main )

        # This is to avoid a race condition in pushing netcfg's.
        main.step( "Loading vpls configuration in case any configuration was missed." )
        loadVPLSResult = main.ONOSbench.onosNetCfg( main.Cluster.active( 0 ).ipAddress, "", fileName )
        utilities.assert_equals( expect=main.TRUE,
                                 actual=loadVPLSResult,
                                 onpass="Loaded vpls configuration.",
                                 onfail="Failed to load vpls configuration." )


    def CASE50( self, main ):
        """
        Initial connectivity check
        """
        main.case( "Check connectivity before running all other tests." )

        # Check connectivity before running all other tests
        connectCheckResult = main.vpls.testConnectivityVpls( main )
        utilities.assert_equals( expect=main.TRUE, actual=connectCheckResult,
                                 onpass="Connectivity is as expected.",
                                 onfail="Connectivity is NOT as expected." )


    def CASE100( self, main ):
        """
        Bring down 1 host at a time and test connectivity
        """
        assert vpls, "vpls not defined"

        main.case( "Bring down one host at a time and test connectivity." )
        result = main.TRUE

        for i in range( 1, hosts + 1 ):

            stri = str( i )

            # Bring host down
            main.step( "Kill link between s" + stri + " and h" + stri + "." )
            linkDownResult = main.Mininet1.link( END1="s" + stri, END2="h" + stri, OPTION="down" )

            # Check if link was successfully down'd
            utilities.assert_equals( expect=main.TRUE, actual=linkDownResult,
                                     onpass="Link down successful.",
                                     onfail="Failed to bring link down." )
            result = result and linkDownResult

            # Check connectivity
            connectivityResult = vpls.testConnectivityVpls( main, blacklist=[ "h" + stri ] )
            result = result and connectivityResult

            # Bring host up
            main.step( "Re-adding link between s" + stri + " and h" + stri + "." )
            linkUpResult = main.Mininet1.link( END1="s" + stri, END2="h" + stri, OPTION="up" )

            # Check if link was successfully re-added
            utilities.assert_equals( expect=main.TRUE, actual=linkUpResult,
                                     onpass="Link up successful.",
                                     onfail="Failed to bring link up." )
            result = result and linkUpResult

            # Discover host using ping
            main.step( "Discover h" + stri + " using ping." )
            main.Mininet1.pingHost( SRC="h" + stri, TARGET="h" + str( ( i % hosts ) + 1 ) )

            # Check connectivity
            connectivityResult = vpls.testConnectivityVpls( main )
            result = result and connectivityResult

        utilities.assert_equals( expect=main.TRUE, actual=result,
                                 onpass="Connectivity is as expected.",
                                 onfail="Connectivity is NOT as expected.")

    def CASE200( self, main ):
        """
        Bring down 1 switch at a time and test connectivity
        """
        assert vpls, "vpls not defined"

        main.case( "Bring down one switch at a time and test connectivity." )
        links = main.Mininet1.getLinks( )  # Obtain links here
        result = main.TRUE

        for i in range( 5, hosts + 1 ):

            stri = str( i )

            # Bring switch down
            main.step( "Delete s" + stri + ".")
            delSwitchResult = main.Mininet1.delSwitch( sw="s" + stri )

            # Check if switch was deleted
            utilities.assert_equals( expect=main.TRUE, actual=delSwitchResult,
                                     onpass="Successfully deleted switch.",
                                     onfail="Failed to delete switch." )
            result = result and delSwitchResult

            # Check connectivity
            connectivityResult = vpls.testConnectivityVpls( main, blacklist=[ "h" + stri ] )
            result = result and connectivityResult

            # Bring switch up
            main.step( "Add s" + stri + ".")
            addSwitchResult = main.Mininet1.addSwitch( sw="s" + stri )

            # Check if switch was added
            utilities.assert_equals( expect=main.TRUE, actual=addSwitchResult,
                                     onpass="Successfully added switch.",
                                     onfail="Failed to add switch.")
            result = result and addSwitchResult

            # Reconnect links
            main.step( "Reconnecting links on s" + stri + ".")
            for j in links:
                if ( j[ 'node1' ] == "s" + stri and j[ 'node2' ][ 0 ] == "s" ) or \
                   ( j[ 'node2' ] == "s" + stri and j[ 'node1' ][ 0 ] == "s" ):
                    main.Mininet1.addLink( str( j[ 'node1' ] ), str( j[ 'node2' ] ) )

            # Discover host using ping
            main.Mininet1.pingHost( SRC="h" + stri, TARGET="h" + str( ( i % hosts ) + 1 ) )

            # Check connectivity
            connectivityResult = vpls.testConnectivityVpls( main )
            result = result and connectivityResult


        utilities.assert_equals( expect=main.TRUE,
                                 actual=result,
                                 onpass="Connectivity is as expected.",
                                 onfail="Connectivity is NOT as expected." )

    def CASE300( self, main ):
        """
        Stop 1 ONOS node at a time and test connectivity
        """
        from tests.USECASE.VPLS.dependencies import vpls
        from tests.HA.dependencies.HA import HA
        assert vpls, "vpls not defined"

        main.HA = HA()
        main.case( "Stop one ONOS node at a time and test connectivity." )

        result = main.TRUE

        for i in range( 0, main.Cluster.numCtrls ):

            stri = str( i )

            ip_address = main.Cluster.active( i ).ipAddress

            # Stop an ONOS node: i
            main.step( "Stop ONOS node " + stri + ".")
            stopResult = main.ONOSbench.onosStop( ip_address )
            main.Cluster.runningNodes[ i ].active = False

            utilities.assert_equals( expect=main.TRUE, actual=stopResult,
                                     onpass="ONOS nodes stopped successfully.",
                                     onfail="ONOS nodes NOT successfully stopped." )

            # Check connectivity
            connectivityResult = vpls.testConnectivityVpls( main, isNodeUp=False )
            result = result and connectivityResult

            # Restart ONOS node
            main.step( "Restart ONOS node " + stri + " and checking status of restart.")
            startResult = main.ONOSbench.onosStart( ip_address )

            utilities.assert_equals( expect=main.TRUE, actual=startResult,
                                     onpass="ONOS nodes started successfully.",
                                     onfail="ONOS nodes NOT successfully started." )
            result = result and startResult

            # Check if ONOS is up yet
            main.log.info( "Checking if ONOS node " + stri + " is up." )
            upResult = main.ONOSbench.isup( ip_address )

            utilities.assert_equals( expect=main.TRUE, actual=upResult,
                                     onpass="ONOS successfully restarted.",
                                     onfail="ONOS did NOT successfully restart." )

            # Restart CLI
            main.log.info( "Restarting ONOS node " + stri + "'s main.CLI." )
            cliResults = main.Cluster.active( 0 ).CLI.startOnosCli( ip_address )
            main.Cluster.runningNodes[ i ].active = True

            utilities.assert_equals( expect=main.TRUE, actual=cliResults,
                                     onpass="ONOS CLI successfully restarted.",
                                     onfail="ONOS CLI did NOT successfully restart." )

            # Run some basic checks to see if ONOS node truly has succesfully restarted:

            # Checking if all nodes appear with status READY using 'nodes' command
            main.step( "Checking ONOS nodes." )
            nodeResults = utilities.retry( main.HA.nodesCheck,
                                           False,
                                           args=[ main.Cluster.runningNodes ],
                                           sleep=main.timeSleep,
                                           attempts=main.numAttempts )

            utilities.assert_equals( expect=True, actual=nodeResults,
                                     onpass="Nodes check successful.",
                                     onfail="Nodes check NOT successful." )

            # All apps that are present are active
            main.log.info( "Checking if apps are active." )
            compareAppsResult = vpls.compareApps( main )
            utilities.assert_equals( expect=main.TRUE,
                                     actual=compareAppsResult,
                                     onpass="Apps are the same across all nodes.",
                                     onfail="Apps are NOT the same across all nodes." )
            result = result and compareAppsResult

            # Check connectivity
            connectivityResult = vpls.testConnectivityVpls( main )
            result = result and connectivityResult

        utilities.assert_equals( expect=main.TRUE,
                                 actual=result,
                                 onpass="Connectivity is as expected.",
                                 onfail="Connectivity is NOT as expected." )


    def CASE310( self, main ):
        """
        Kill 1 ONOS node at a time and test connectivity
        """
        assert vpls, "vpls not defined"

        main.case( "Kill one ONOS node at a time and test connectivity." )
        killSleep = int( main.params[ 'SLEEP' ][ 'killnode' ] )
        result = main.TRUE

        for i in range( 0, main.Cluster.numCtrls ):

            # Kill an ONOS node
            main.step( "Killing ONOS node " + str( i + 1 ) + "." )
            killresult = main.ONOSbench.onosKill( main.Cluster.active( i ).ipAddress )

            # Check if ONOS node has been successfully killed
            utilities.assert_equals( expect=main.TRUE, actual=killresult,
                                     onpass="ONOS node killed successfully.",
                                     onfail="ONOS node NOT successfully killed." )

            main.step( "Waiting for ONOS to restart." )
            main.log.info( "Sleeping for " + str( killSleep ) + " seconds..." )
            time.sleep( killSleep )

            # Check connectivity
            connectivityResult = vpls.testConnectivityVpls( main )
            result = result and connectivityResult

        utilities.assert_equals( expect=main.TRUE,
                                 actual=result,
                                 onpass="Connectivity is as expected.",
                                 onfail="Connectivity is NOT as expected.")


    def CASE400( self, main ):
        """
        Bring down 1 link at a time and test connectivity
        """
        assert vpls, "vpls not defined"


        main.case( "Bring down one link at a time and test connectivity." )

        result = main.TRUE

        for link in main.Mininet1.getLinks():
            nodes = [ link[ 'node1' ], link[ 'node2' ] ]

            # Bring down a link
            main.step( "Bring down link: " + nodes[ 0 ] + " to " + nodes[ 1 ] )
            delLinkResult = main.Mininet1.link( END1=nodes[ 0 ], END2=nodes[ 1 ], OPTION="down" )

            # Check if the link has successfully been brought down
            utilities.assert_equals( expect=main.TRUE, actual=delLinkResult,
                                     onpass="Successfully deleted link.",
                                     onfail="Failed to delete link." )
            result = result and delLinkResult

            # Add removed host to blacklist if necessary
            blacklist = []
            for l in nodes:
                if l[ 0 ] == 'h':
                    blacklist.append( l )

            # Check intent states, then connectivity
            connectivityResult = vpls.testConnectivityVpls( main, blacklist )
            result = result and connectivityResult

            # Re-add the link
            main.step( "Adding link: " + nodes[ 0 ] + " to " + nodes[ 1 ] + "." )
            addLinkResult = main.Mininet1.link( END1=nodes[ 0 ], END2=nodes[ 1 ], OPTION="up" )

            # Check if the link has successfully been added
            utilities.assert_equals( expect=main.TRUE, actual=addLinkResult,
                                     onpass="Successfully added link.",
                                     onfail="Failed to delete link." )
            result = result and addLinkResult

            main.log.debug( main.timeSleep )
            time.sleep( main.timeSleep )

            # Check intent states, then connectivity
            connectivityResult = vpls.testConnectivityVpls( main )
            result = result and connectivityResult

        utilities.assert_equals( expect=main.TRUE,
                                 actual=result,
                                 onpass="Connectivity is as expected.",
                                 onfail="Connectivity is NOT as expected." )