# -*- coding: utf-8 -*-
#
# Copyright (C) 2014 GNS3 Technologies Inc.
#
# 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 3 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, see <http://www.gnu.org/licenses/>.

"""
Handles commands typed in the GNS3 console.
"""

import os
import sys
import cmd
import struct
from .qt import sip

from .node import Node
from .qt import QtCore
from .version import __version__

import logging
log = logging.getLogger(__name__)


class ConsoleCmd(cmd.Cmd):

    def do_env(self, args):
        """
        Show the environment variables used by GNS3.
        """

        for key, val in os.environ.items():
            print("{}={}".format(key, val))

    def do_version(self, args):
        """
        Show the version of GNS3 and its dependencies.
        """

        compiled = ""
        if hasattr(sys, "frozen"):
            compiled = "(compiled)"
        print("GNS3 version is {} {}".format(__version__, compiled))
        print("Python version is {}.{}.{} ({}-bit) with {} encoding".format(sys.version_info[0],
                                                                            sys.version_info[1],
                                                                            sys.version_info[2],
                                                                            struct.calcsize("P") * 8,
                                                                            sys.getdefaultencoding()))
        print("Qt version is {}".format(QtCore.QT_VERSION_STR))

        print("PyQt version is {}".format(QtCore.PYQT_VERSION_STR))
        print("SIP version is {}".format(sip.SIP_VERSION_STR))

    def do_start(self, args):
        """
        Start all or a specific device(s)
        start {/all | device1 [device2] ...}
        """

        if '?' in args or args.strip() == "":
            print(self.do_start.__doc__)
            return

        devices = args.split()
        if '/all' in devices:
            for node in self._topology.nodes():
                if hasattr(node, "start") and node.initialized():
                    node.start()
        else:
            for device in devices:
                for node in self._topology.nodes():
                    if node.name() == device:
                        if hasattr(node, "start") and node.initialized():
                            node.start()
                        else:
                            print("{} cannot be started".format(device))
                        break

    def do_stop(self, args):
        """
        Stop all or a specific device(s)
        stop {/all | device1 [device2] ...}
        """

        if '?' in args or args.strip() == "":
            print(self.do_stop.__doc__)
            return

        devices = args.split()
        if '/all' in devices:
            for node in self._topology.nodes():
                if hasattr(node, "stop") and node.initialized():
                    node.stop()
        else:
            for device in devices:
                for node in self._topology.nodes():
                    if node.name() == device:
                        if hasattr(node, "stop") and node.initialized():
                            node.stop()
                        else:
                            print("{} cannot be stopped".format(device))
                        break

    def do_suspend(self, args):
        """
        Suspend all or a specific device(s)
        suspend {/all | device1 [device2] ...}
        """

        if '?' in args or args.strip() == "":
            print(self.do_suspend.__doc__)
            return

        devices = args.split()
        if '/all' in devices:
            for node in self._topology.nodes():
                if hasattr(node, "suspend") and node.initialized():
                    node.suspend()
        else:
            for device in devices:
                for node in self._topology.nodes():
                    if node.name() == device:
                        if hasattr(node, "suspend") and node.initialized():
                            node.suspend()
                        else:
                            print("{} cannot be suspended".format(device))
                        break

    def do_reload(self, args):
        """
        Reload all or a specific device(s)
        reload {/all | device1 [device2] ...}
        """

        if '?' in args or args.strip() == "":
            print(self.do_reload.__doc__)
            return

        devices = args.split()
        if '/all' in devices:
            for node in self._topology.nodes():
                if hasattr(node, "reload") and node.initialized():
                    node.reload()
        else:
            for device in devices:
                for node in self._topology.nodes():
                    if node.name() == device:
                        if hasattr(node, "reload") and node.initialized():
                            node.reload()
                        else:
                            print("{} cannot be reloaded".format(device))
                        break

    def do_console(self, args):
        """
        Console to all or a specific device(s)
        console {/all | device1 [device2] ...}
        """

        if '?' in args or args.strip() == "":
            print(self.do_console.__doc__)
            return

        devices = args.split()
        if '/all' in devices:
            for node in self._topology.nodes():
                if hasattr(node, "console") and node.initialized() and node.status() == Node.started:
                    self._start_console(node)
        else:
            for device in devices:
                for node in self._topology.nodes():
                    if node.name() == device:
                        if hasattr(node, "console") and node.initialized() and node.status() == Node.started:
                            self._start_console(node)
                        else:
                            print("Cannot console to {}".format(device))
                        break

    def do_log(self, args):
        """
        Log a message

        log level message
        """

        args = args.split()
        if len(args) == 0:
            return
        level = args.pop(0)
        if level == "info":
            log.info(" ".join(args))
        elif level == "warning":
            log.warning(" ".join(args))
        else:
            log.error(" ".join(args))

    def _start_console(self, node):
        """
        Starts a console application for a specific node.

        :param node: Node instance
        """

        console_port = node.console()
        from .telnet_console import nodeTelnetConsole
        nodeTelnetConsole(node, console_port)

    def do_debug(self, args):
        """
        Activate or deactivate debugging messages
        debug [level] (0, 1 or 2).
        """

        if '?' in args or args.strip() == "":
            print(self.do_debug.__doc__)
            return

        root = logging.getLogger()

        if len(args) == 1:
            level = int(args[0])
            if level == 0:
                print("Deactivating debugging")
                root.setLevel(logging.INFO)
            else:
                print("Activating debugging")
                root.setLevel(logging.DEBUG)
            from .main_window import MainWindow
            MainWindow.instance().setSettings({"debug_level": level})
        else:
            print(self.do_debug.__doc__)

    def _show_device(self, params):
        """
        Handles the 'show device' command.

        :param params: list of parameters
        """

        if len(params) == 1:
            # print out all the device info
            for node in self._topology.nodes():
                if hasattr(node, "info"):
                    print(node.info())

        elif len(params) >= 2:
            # this is a 'show device <device_name>'
            params.pop(0)
            for param in params:
                node_name = param
                found = False
                for node in self._topology.nodes():
                    if hasattr(node, "info") and node.name() == node_name:
                        print(node.info())
                        found = True
                        break

                if found is False:
                    print("{}: no such device".format(node_name))
                    continue

    def do_show(self, args):
        """
        Show detail information about every device in current lab:
        show device

        Show detail information about a device:
        show device <device_name>
        """

        if '?' in args or args.strip() == "":
            print(self.do_show.__doc__)
            return

        params = args.split()
        if params[0] == "device":
            self._show_device(params)
        else:
            print(self.do_show.__doc__)

    def do_help(self, args):
        """
        Get help on commands
        'help' or '?' with no arguments prints a list of commands for which help is available
        'help <command>' or '? <command>' gives help on <command>
        """

        cmd.Cmd.do_help(self, args)
