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#!/bin/env python

import os

import sys

import logging as log

import getopt

import atexit

import time

from CanPktHandlerBase import CanPktHandlerBase

from CanPktHandler1 import CanPktHandler1

from NodeIfBase import NodeIfBase

from NodeIfCanStim import NodeIfCanStim

from NodeIfSerial import NodeIfSerial

from NodeIfTCP import NodeIfTCP

from DaemonConfig import DaemonConfig

daemonApp = None

class CanDaemon():

    cfg = None

    nodeIf = None

    ifNotifier = None

    terminated = False

    command_list = []

    command_map = {}

    CMDLIST_NAME = 0

    CMDLIST_HANDLER = 1

    CMDLIST_PARAMINFO = 2

    CMDLIST_HELP = 3

    logHelp = 'usage:\t log [options]\n\n' \

              '\t options:\n' \

              '\t level <num>, where: 0 < num < 3\n'

    stateHelp = 'usage: state [name/add/rem]'

    filterHelp = 'usage: filter [name/add/rem]'

    addifHelp = 'usage: addif [name] [options]'

    addbridgeHelp = 'usage: addbridge [interface names]'

    tcpdHelp = 'usage: tcpd [start/stop/configure] [options]'

    tlsdHelp = 'usage: tlsd [start/stop/configure] [options]'

    canctldHelp = 'usage: canctld [start/stop/configure] [options]'

    simHelp = 'usage: sim [record/play/add/rem/save/load] [options]'

    help_command_map = {}

    logOptions = {}

    ifOptions = {}

    bridgeOptions = {}

    tcpdOptions = {}

    tlsdOptions = {}

    canctldOptions = {}

    simOptions = {}

    logValidOptions = {'level' : ['range', 0, 3]}

    ifValidOptions = {'type' : ['alt', 'serial','udp']}

    ifSerialOptions = {'' : []}

    ifCanStimOptions = {'' : []}

    ifTelnetOptions = {'' : []}

    ifTcpTlsOptions = {'' : []}

    ifUDPOptions = {'' : []}

    bridgeValidOptions = {'' : ['']}

    tcpdValidOptions = {'' : []}

    tlsdValidOptions = {'' : []}

    canctldValidOptions = {'' : []}

    simValidOptions = {'' : []}

    def __init__ (self):

        self.command_list = [['help', self.helpCmd, '', 'display help'],

                       ['log', self.logCmd, '<options>', 'log control: \"help log\"'],

                       ['exec', self.execCmd, '<filename>', 'run command listing\n'],

                       ['filter', self.filterCmd, '<cmd>', 'filter commands: \"help filter\"'],

                       ['state', self.stateCmd, '<cmd>', 'state commands: \"help state\"\n'],

                       ['addif', self.ifAddCmd, '<options>', 'add interface: \"help addif\"'],

                       ['remif', self.ifRemCmd, '<name>', 'remove interface'],

                       ['ifup', self.ifUpCmd, '<name>', 'bring up interface'],

                       ['ifdown', self.ifDownCmd, '<name>', 'bring down interface\n'],

                       ['addbrigde', self.addBridgeCmd, '<options>', 'add bridge: \"help addbridge\"'],

                       ['rembridge', self.remBridgeCmd, '<id>', 'remove bridge\n'],

                       ['tcpd', self.tcpdCmd, '<cmd>', 'tcpd server control: \"help tcpd\"'],

                       ['tlsd', self.tlsdCmd, '<cmd>', 'tlsd server control: \"help tlsd\"'],

                       ['canctld', self.canCtldCmd, '<cmd>', 'canctld server control: \"help canctld\"\n'],

                       ['status', self.statusCmd, '', 'show daemon status'],

                       ['stats', self.statsCmd, '', 'show statistics\n'],

                       ['nodelist', self.nodesCmd, '', 'list can nodes'],

                       ['filterlist', self.filterlistCmd, '', 'list active filters\n'],

                       ['sim', self.simCmd, '<cmd>', 'simulator commands: \"help sim\"']]

        index = 0

        for cmd in self.command_list:

            self.command_map[cmd[0]] = index

            index += 1

        self.help_command_map = {'log' : self.logHelp,

                                'filter' : self.filterHelp,

                                'state' : self.stateHelp,

                                'addif' : self.addifHelp,

                                'addbridge' : self.addbridgeHelp,

                                'tcpd' : self.tcpdHelp,

                                'tlsd' : self.tlsdHelp,

                                'canctld' : self.canctldHelp,

                                'sim' : self.simHelp}

        self.cfg = DaemonConfig()

    class IfNotifier():

        """ Used by if threads to send messages to the main program thread """

        parent = None

        UNDEFINED = 0

        TERMINATE = 1

        def __init__(self, parent):

            self.parent = parent

        def notify(self, msg):

            if msg == self.TERMINATE:

                print 'Main terminate notify'

            else:

                print 'UNDEFINED NOTIFY'

    def __rightAdjust(self, refstr, str):

        spcstr = ''

        endpos = 25-len(refstr)

        for i in range(1,endpos):

            if i == endpos-5:

                spcstr += ':'

            else:

                spcstr += ' '

        return (spcstr+str)

    def helpCmd(self, *args):

        try:

            args = args[0]

        except:

            args = []

        if len(args) < 1:

            quitStr = 'quit, exit'

            print quitStr, self.__rightAdjust(quitStr, 'shutdown pyCanDaemon')

            for cmd in self.command_list:

                cmdstr = cmd[self.CMDLIST_NAME] + ' ' + cmd[self.CMDLIST_PARAMINFO]

                print cmdstr, \

                      self.__rightAdjust(cmdstr, cmd[self.CMDLIST_HELP])

        elif len(args) < 2:

            subCmd = args[0]

            if self.help_command_map.has_key(subCmd):

                print self.help_command_map[subCmd]

            else:

                print 'no help for ' + subCmd

        else:

            print 'usage: help [topic]'

    def filterCmd(self, *args):

        try:

            args = args[0]

        except:

            args = []

        log.debug('filterCmd ' + str(args))

        if len(args) < 2:

            print 'Invalid arguments\n' + self.filterHelp

            return

        cmd = args[0]

        filterName = args[1]

        # FIXME: verify 

        if cmd == 'add':

            print 'Importing filter: ' + filterName

            self.cfg.filterCfg.importFilter(filterName)

        elif cmd == 'rem' or cmd == 'remove':

            print 'Deleting filter: ' + filterName

            # FIXME: actually delete

            raise 'Not implemented'

    def stateCmd(self, *args):

        try:

            args = args[0]

        except:

            args = []

        log.debug('stateCmd ' + str(args))

        if len(args) < 2:

            print 'Invalid arguments\n' + self.stateHelp

            return

        cmd = args[0]

        spaceName = args[1]

        # FIXME: verify 

        if cmd == 'add':

            print 'Importing state space: ' + spaceName

            self.cfg.stateSpaceCfg.importSpace(spaceName)

        elif cmd == 'rem' or cmd == 'remove':

            print 'Deleting state space: ' + spaceName

            # FIXME: actually delete statespace

            raise 'Not implemented'

    def ifAddCmd(self, *args):

        raise 'not implemented'

    def ifRemCmd(self, *args):

        raise 'not implemented'

    def ifUpCmd(self, *args):

        raise 'not implemented'

    def ifDownCmd(self, *args):

        raise 'not implemented'

    def addBridgeCmd(self, *args):

        raise 'not implemented'

    def remBridgeCmd(self, *args):

        raise 'not implemented'

    def tcpdCmd(self, *args):

        raise 'not implemented'

    def tlsdCmd(self, *args):

        raise 'not implemented'

    def canCtldCmd(self, *args):

        raise 'not implemented'

    def statusCmd(self, *args):

        raise 'not implemented'

    def statsCmd(self, *args):

        raise 'not implemented'

    def nodesCmd(self, *args):

        raise 'not implemented'

    def filterlistCmd(self, *args):

        raise 'not implemented'

    def simCmd(self, *args):

        raise 'not implemented'

    def logCmd(self, *args):

        raise 'not implemented'

    def execCmd(self, *args):

        raise 'not implemented'

    def parseCommand(self, cmdstr):

        incmd = cmdstr.strip()

        cmd = incmd.split(' ')

        if len(cmd[0]) < 2:

            return

        cmd[0] = cmd[0].lower()

        if cmd[0] == 'quit' or cmd[0] == 'exit':

            self.terminated = True

        elif self.command_map.has_key(cmd[0]):

            self.command_list[self.command_map[cmd[0]]][self.CMDLIST_HANDLER](cmd[1:])

        else:

            print 'unknown command: ' + cmd[0]

    def exitHelper(self):

        if self.nodeIf is not None and self.nodeIf.running():

            self.nodeIf.stop()

    def exceptHelper(self, type, value, tb):

        import traceback

        traceback.print_exception(type, value, tb)

        print '\nException in main program, shutting down threads'

        self.terminated = True

        self.exitHelper()

 #       sys.exit(-1)

    def run(self):

        try:

            myPath = os.path.dirname(__file__)

            os.chdir(myPath)

        except:

            return

        print 'INIT: Start logging'

        log.basicConfig(level=log.DEBUG)

        """command parameters only dictate verbosity and use of config file"""

        print 'INIT: Get config options from command line / config file'

        try:

            opts, args = getopt.getopt(sys.argv[1:], "ho:v", ["help", "output="])

        except getopt.GetoptError:

            print 'Invalid usage'

            usage()

            sys.exit(2)

     #   output = None

     #   verbose = False

        for o, a in opts:

            if o == "-v":

                pass

     #           verbose = True

            if o in ("-h", "--help"):

                usage()

                sys.exit()

            if o in ("-o", "--output"):

                pass

    #            output = a

        """load config defaults, or last config if exists"""

        """run startup.cfg"""

#        print 'INIT: Loading filters and spaces'

#       self.cfg.filterCfg.importFilter('DefaultFilter')

#       self.cfg.stateSpaceCfg.importSpace('DefaultStateSpace')

#        self.cfg.stateSpaceCfg.loadSpaces()

#        self.cfg.filterCfg.loadFilters()

#        self.cfg.setupFilterBindings()

#        self.cfg.setupFilterChain()

#        print 'INIT: Starting selected can interface'

#        ''' nodeif thread launch '''

        self.ifNotifier = self.IfNotifier(self)

        pktHandler = CanPktHandler1(self.cfg)

#        

#        ifConfig = NodeIfCanStim.DEFAULT_CONFIG

#        self.nodeIf = NodeIfCanStim(ifConfig, pktHandler, self.ifNotifier)

# #       ifConfig = NodeIfSerial.DEFAULT_CONFIG

        ifConfig = NodeIfTCP.DEFAULT_CONFIG

#    

        atexit.register(self.exitHelper)

        sys.excepthook = self.exceptHelper

        self.nodeIf = NodeIfTCP(pktHandler, self.ifNotifier ,None)

#       self.nodeIf = NodeIfSerial(pktHandler, ifConfig)

#        

        if not self.nodeIf.start():

            print 'FATAL: Failed to initialize node interface.'

            print 'This may indicate that the interface is unavailable, ' \

                  'or that you do not have permission to access it.'

            sys.exit(-1)

        print 'Initialize/gather info on connected can nodes and load associated state'

        print 'Start selected TCP and UDP server(s)'

        # server threads launch

        print 'CanDaemon v1 ready'

        print 'Enter command or type \"help\" for a list of commands'

        while not self.terminated:

            input = raw_input('> ')

            self.parseCommand(input)

        print 'Shutdown'

#        if self.nodeIf.running():

#            print 'Stopping If thread'

#            self.nodeIf.stop()

#        self.cfg.stateSpaceCfg.saveSpaces()

#        self.cfg.filterCfg.saveFilters()

        print 'Waiting 0.1..'

        time.sleep(0.1) # wait for threads

        print 'Terminating'

        sys.exit(0) # will except if there are threads remaining

#---------------------------------------------------------------------------

def main():

    daemonApp = CanDaemon()

#    install_thread_excepthook()

    daemonApp.run()

#---------------------------------------------------------------------------

if __name__ == '__main__':

    __name__ = 'Main'

    main()