#
#  Copyright (c) 2008 Helmut Merz helmutm@cy55.de
#
#  This program 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.
#
#  This program 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 this program; if not, write to the Free Software
#  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
#

"""
Base/sample controller implementation.

$Id$
"""

from twisted.internet import protocol, reactor, stdio
from twisted.protocols import basic
from zope.interface import implements

from cybertools.agent.base.agent import Master
from cybertools.agent.core.control import SampleController
from cybertools.agent.components import controllers


class CmdlineController(SampleController):

    def setup(self):
        super(CmdlineController, self).setup()
        prot = CmdlineProtocol()
        prot.controller = self
        stdio.StandardIO(prot)

controllers.register(CmdlineController, Master, name='cmdline')


class TelnetController(CmdlineController):

    delimiter = '\r\n'

    def setup(self):
        super(CmdlineController, self).setup()
        port = self.agent.config.controller.telnet.port
        reactor.listenTCP(port, TelnetServerFactory(self))

controllers.register(TelnetController, Master, name='telnet')


class CmdlineProtocol(basic.LineReceiver):

    delimiter = '\n'
    controller = None

    def connectionMade(self):
        self.sendLine("Agent console. Type 'help' for help.")

    def lineReceived(self, line):
        if not line:
            return
        commandParts = line.split()
        command = commandParts[0].lower()
        args = commandParts[1:]
        try:
            method = getattr(self, 'do_' + command)
        except AttributeError, e:
            self.sendLine('Error: no such command.')
        else:
            try:
                method(*args)
            except Exception, e:
                self.sendLine('Error: ' + str(e))

    def do_help(self, command=None):
        if command:
            self.sendLine(getattr(self, 'do_' + command).__doc__)
        else:
            commands = [cmd[3:] for cmd in dir(self) if cmd.startswith('do_')]
            self.sendLine("Valid commands: " +" ".join(commands))

    def do_shutdown(self):
        self.sendLine('Shutting down.')
        reactor.stop()


class TelnetProtocol(CmdlineProtocol):

    delimiter = '\r\n'

    def do_quit(self):
        self.sendLine('Goodbye.')
        self.transport.loseConnection()


class TelnetServerFactory(protocol.ServerFactory):

    def __init__(self, controller):
        self.controller = controller

    def protocol(self, *args, **kw):
        prot = TelnetProtocol(*args, **kw)
        prot.controller = self.controller
        return prot