#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
Dan Klein, Itay Marom
Cisco Systems, Inc.

Copyright (c) 2015-2015 Cisco Systems, Inc.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
    http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
"""


import cmd
import json
import ast
import argparse
import random
import string
import os
import sys
import tty, termios
import trex_root_path
from common.trex_streams import *
from client.trex_stateless_client import CTRexStatelessClient
from common.text_opts import *
from client_utils.general_utils import user_input, get_current_user

import trex_status
from collections import namedtuple

__version__ = "1.0"

LoadedStreamList = namedtuple('LoadedStreamList', ['loaded', 'compiled'])


def readch(choices=[]):

    fd = sys.stdin.fileno()
    old_settings = termios.tcgetattr(fd)
    try:
        tty.setraw(sys.stdin.fileno())
        while True:
            ch = sys.stdin.read(1)
            if (ord(ch) == 3) or (ord(ch) == 4):
                return None
            if ch in choices:
                return ch
    finally:
        termios.tcsetattr(fd, termios.TCSADRAIN, old_settings)

    return None

class ConfirmMenu(object):
    def __init__ (self, caption):
        self.caption = "{cap} [confirm] : ".format(cap=caption)

    def show(self):
        sys.stdout.write(self.caption)
        input = user_input()
        if input:
            return False
        else:
            # user hit Enter
            return True
        

class CStreamsDB(object):

    def __init__(self):
        self.stream_packs = {}

    def load_streams(self, name, LoadedStreamList_obj):
        if name in self.stream_packs:
            return False
        else:
            self.stream_packs[name] = LoadedStreamList_obj
            return True

    def remove_stream_packs(self, *names):
        removed_streams = []
        for name in names:
            removed = self.stream_packs.pop(name)
            if removed:
                removed_streams.append(name)
        return removed_streams

    def clear(self):
        self.stream_packs.clear()

    def get_loaded_streams_names(self):
        return self.stream_packs.keys()

    def get_stream_pack(self, name):
        return self.stream_packs.get(name)


# multi level cmd menu
class CmdMenu(object):
    def __init__ (self):
        self.menus = []


    def add_menu (self, caption, options):
        menu = {}
        menu['caption'] = caption
        menu['options'] = options
        self.menus.append(menu)

    def show (self):
        cur_level = 0
        print "\n"

        selected_path = []
        for menu in self.menus:
            # show all the options
            print "{0}\n".format(menu['caption'])
            for i, option in enumerate(menu['options']):
                print "{0}. {1}".format(i + 1, option)

            #print "\nPlease select an option: "

            choices = range(0, len(menu['options']))
            choices = [ chr(x + 48) for x in choices]

            print ""
            ch = readch(choices)
            print ""

            if ch == None:
                return None

            selected_path.append(int(ch) - 1)

        return selected_path


class AddStreamMenu(CmdMenu):
    def __init__ (self):
        super(AddStreamMenu, self).__init__()
        self.add_menu('Please select type of stream', ['a', 'b', 'c'])
        self.add_menu('Please select ISG', ['d', 'e', 'f'])

# main console object
class TRexConsole(cmd.Cmd):
    """Trex Console"""

    def __init__(self, stateless_client, verbose):
        cmd.Cmd.__init__(self)

        self.stateless_client = stateless_client

        self.do_connect("")

        self.intro  = "\n-=TRex Console v{ver}=-\n".format(ver=__version__)
        self.intro += "\nType 'help' or '?' for supported actions\n"

        self.verbose = False

        self.postcmd(False, "")

        self.user_streams = {}
        self.streams_db = CStreamsDB()


    # a cool hack - i stole this function and added space
    def completenames(self, text, *ignored):
        dotext = 'do_'+text
        return [a[3:]+' ' for a in self.get_names() if a.startswith(dotext)]


    # set verbose on / off
    def do_verbose (self, line):
        '''Shows or set verbose mode\n'''
        if line == "":
            print "\nverbose is " + ("on\n" if self.verbose else "off\n")

        elif line == "on":
            self.verbose = True
            self.stateless_client.set_verbose(True)
            print green("\nverbose set to on\n")

        elif line == "off":
            self.verbose = False
            self.stateless_client.set_verbose(False)
            print green("\nverbose set to off\n")

        else:
            print magenta("\nplease specify 'on' or 'off'\n")

    # query the server for registered commands
    def do_query_server(self, line):
        '''query the RPC server for supported remote commands\n'''

        res_ok, msg = self.stateless_client.get_supported_cmds()
        if not res_ok:
            print format_text("[FAILED]\n", 'red', 'bold')
            return
        print "\nRPC server supports the following commands:\n"
        for func in msg:
            if func:
                print func
        print ''
        print format_text("[SUCCESS]\n", 'green', 'bold')
        return

    def do_ping (self, line):
        '''Pings the RPC server\n'''

        print "\n-> Pinging RPC server"

        res_ok, msg = self.stateless_client.ping()
        if res_ok:
            print format_text("[SUCCESS]\n", 'green', 'bold')
        else:
            print "\n*** " + msg + "\n"
            return

    def do_force_acquire (self, line):
        '''Acquires ports by force\n'''

        self.do_acquire(line, True)

    def complete_force_acquire(self, text, line, begidx, endidx):
        return self.port_auto_complete(text, line, begidx, endidx, acquired=False)

    def extract_port_ids_from_line(self, line):
        return {int(x) for x in line.split()}

    def parse_ports_from_line (self, line):
        port_list = set()
        if line:
            for port_id in line.split(' '):
                if (not port_id.isdigit()) or (int(port_id) < 0) or (int(port_id) >= self.stateless_client.get_port_count()):
                    print "Please provide a list of ports separated by spaces between 0 and {0}".format(self.stateless_client.get_port_count() - 1)
                    return None

                port_list.add(int(port_id))

            port_list = list(port_list)

        else:
            port_list = [i for i in xrange(0, self.stateless_client.get_port_count())]

        return port_list

    def do_acquire(self, line, force=False):
        '''Acquire ports\n'''

        # make sure that the user wants to acquire all
        args = line.split()
        if len(args) < 1:
            print magenta("Please provide a list of ports separated by spaces, or specify 'all' to acquire all available ports")
            return

        if args[0] == "all":
            ask = ConfirmMenu('Are you sure you want to acquire all ports ? ')
            rc = ask.show()
            if rc == False:
                print yellow("[ABORTED]\n")
                return
            else:
                port_list = self.stateless_client.get_port_ids()
        else:
            port_list = self.extract_port_ids_from_line(line)

        # rc, resp_list = self.stateless_client.take_ownership(port_list, force)
        try:
            res_ok, log = self.stateless_client.acquire(port_list, force)
            self.prompt_response(log)
            if not res_ok:
                print format_text("[FAILED]\n", 'red', 'bold')
                return
            print format_text("[SUCCESS]\n", 'green', 'bold')
        except ValueError as e:
            print magenta(str(e))
            print format_text("[FAILED]\n", 'red', 'bold')


    def port_auto_complete(self, text, line, begidx, endidx, acquired=True, active=False):
        if acquired:
            if not active:
                ret_list = [x
                            for x in map(str, self.stateless_client.get_acquired_ports())
                            if x.startswith(text)]
            else:
                ret_list = [x
                            for x in map(str, self.stateless_client.get_active_ports())
                            if x.startswith(text)]
        else:
            ret_list = [x
                        for x in map(str, self.stateless_client.get_port_ids())
                        if x.startswith(text)]
        ret_list.append("all")
        return ret_list


    def complete_acquire(self, text, line, begidx, endidx):
        return self.port_auto_complete(text, line, begidx, endidx, acquired=False)

    def do_release (self, line):
        '''Release ports\n'''

        # if line:
        #     port_list = self.parse_ports_from_line(line)
        # else:
        #     port_list = self.stateless_client.get_owned_ports()
        args = line.split()
        if len(args) < 1:
            print "Please provide a list of ports separated by spaces, or specify 'all' to acquire all available ports"
        if args[0] == "all":
            ask = ConfirmMenu('Are you sure you want to release all acquired ports? ')
            rc = ask.show()
            if rc == False:
                print yellow("[ABORTED]\n")
                return
            else:
                port_list = self.stateless_client.get_acquired_ports()
        else:
            port_list = self.extract_port_ids_from_line(line)

        try:
            res_ok, log = self.stateless_client.release(port_list)
            self.prompt_response(log)
            if not res_ok:
                print format_text("[FAILED]\n", 'red', 'bold')
                return
            print format_text("[SUCCESS]\n", 'green', 'bold')
        except ValueError as e:
            print magenta(str(e))
            print format_text("[FAILED]\n", 'red', 'bold')
            return

    def complete_release(self, text, line, begidx, endidx):
        return self.port_auto_complete(text, line, begidx, endidx)

    def do_connect (self, line):
        '''Connects to the server\n'''

        if line == "":
            res_ok, msg = self.stateless_client.connect()
        else:
            sp = line.split()
            if (len(sp) != 2):
                print "\n[usage] connect [server] [port] or without parameters\n"
                return

            res_ok, msg = self.stateless_client.connect(sp[0], sp[1])

        if res_ok:
            print format_text("[SUCCESS]\n", 'green', 'bold')
        else:
            print "\n*** " + msg + "\n"
            print format_text("[FAILED]\n", 'red', 'bold')
            return

        self.supported_rpc = self.stateless_client.get_supported_cmds().data

    def do_rpc (self, line):
        '''Launches a RPC on the server\n'''

        if line == "":
            print "\nUsage: [method name] [param dict as string]\n"
            print "Example: rpc test_add {'x': 12, 'y': 17}\n"
            return

        sp = line.split(' ', 1)
        method = sp[0]

        params = None
        bad_parse = False
        if len(sp) > 1:

            try:
                params = ast.literal_eval(sp[1])
                if not isinstance(params, dict):
                    bad_parse = True

            except ValueError as e1:
                bad_parse = True
            except SyntaxError as e2:
                bad_parse = True

        if bad_parse:
            print "\nValue should be a valid dict: '{0}'".format(sp[1])
            print "\nUsage: [method name] [param dict as string]\n"
            print "Example: rpc test_add {'x': 12, 'y': 17}\n"
            return

        res_ok, msg = self.stateless_client.transmit(method, params)
        if res_ok:
            print "\nServer Response:\n\n" + pretty_json(json.dumps(msg)) + "\n"
        else:
            print "\n*** " + msg + "\n"
            #print "Please try 'reconnect' to reconnect to server"


    def complete_rpc (self, text, line, begidx, endidx):
        return [x
                for x in self.supported_rpc
                if x.startswith(text)]

    def do_status (self, line):
        '''Shows a graphical console\n'''

        if not self.stateless_client.is_connected():
            print "Not connected to server\n"
            return

        self.do_verbose('off')
        trex_status.show_trex_status(self.stateless_client)

    def do_quit(self, line):
        '''Exit the client\n'''
        return True

    def do_disconnect (self, line):
        '''Disconnect from the server\n'''
        if not self.stateless_client.is_connected():
            print "Not connected to server\n"
            return

        res_ok, msg = self.stateless_client.disconnect()
        if res_ok:
            print format_text("[SUCCESS]\n", 'green', 'bold')
        else:
            print msg + "\n"

    def do_whoami (self, line):
        '''Prints console user name\n'''
        print "\n" + self.stateless_client.user + "\n"

    def postcmd(self, stop, line):
        if self.stateless_client.is_connected():
            self.prompt = "TRex > "
        else:
            self.supported_rpc = None
            self.prompt = "TRex (offline) > "

        return stop

    def default(self, line):
        print "'{0}' is an unrecognized command. type 'help' or '?' for a list\n".format(line)

    def do_help (self, line):
        '''Shows This Help Screen\n'''
        if line:
            try:
                func = getattr(self, 'help_' + line)
            except AttributeError:
                try:
                    doc = getattr(self, 'do_' + line).__doc__
                    if doc:
                        self.stdout.write("%s\n"%str(doc))
                        return
                except AttributeError:
                    pass
                self.stdout.write("%s\n"%str(self.nohelp % (line,)))
                return
            func()
            return

        print "\nSupported Console Commands:"
        print "----------------------------\n"

        cmds =  [x[3:] for x in self.get_names() if x.startswith("do_")]
        for cmd in cmds:
            if cmd == "EOF":
                continue

            try:
                doc = getattr(self, 'do_' + cmd).__doc__
                if doc:
                    help = str(doc)
                else:
                    help = "*** Undocumented Function ***\n"
            except AttributeError:
                help = "*** Undocumented Function ***\n"

            print "{:<30} {:<30}".format(cmd + " - ", help)

    def do_stream_db_add(self, line):
        '''Loads a YAML stream list serialization into user console \n'''
        args = line.split()
        if len(args) >= 2:
            name = args[0]
            yaml_path = args[1]
            try:
                multiplier = args[2]
            except IndexError:
                multiplier = 1
            stream_list = CStreamList()
            loaded_obj = stream_list.load_yaml(yaml_path, multiplier)
            # print self.stateless_client.pretty_json(json.dumps(loaded_obj))
            try:
                compiled_streams = stream_list.compile_streams()
                res_ok = self.streams_db.load_streams(name, LoadedStreamList(loaded_obj,
                                                                             [StreamPack(v.stream_id, v.stream.dump())
                                                                              for k, v in compiled_streams.items()]))
                if res_ok:
                    print green("Stream pack '{0}' loaded and added successfully\n".format(name))
                else:
                    print magenta("Picked name already exist. Please pick another name.\n")
            except Exception as e:
                print "adding new stream failed due to the following error:\n", str(e)
                print format_text("[FAILED]\n", 'red', 'bold')

            return
        else:
            print magenta("please provide load name and YAML path, separated by space.\n"
                          "Optionally, you may provide a third argument to specify multiplier.\n")

    @staticmethod
    def tree_autocomplete(text):
        dir = os.path.dirname(text)
        if dir:
            path = dir
        else:
            path = "."
        start_string = os.path.basename(text)
        return [x
                for x in os.listdir(path)
                if x.startswith(start_string)]


    def complete_stream_db_add(self, text, line, begidx, endidx):
        arg_num = len(line.split()) - 1
        if arg_num == 2:
            return TRexConsole.tree_autocomplete(line.split()[-1])
        else:
            return [text]

    def do_stream_db_show(self, line):
        '''Shows the loaded stream list named [name] \n'''
        args = line.split()
        if args:
            list_name = args[0]
            try:
                stream = self.streams_db.get_stream_pack(list_name)#user_streams[list_name]
                if len(args) >= 2 and args[1] == "full":
                    print pretty_json(json.dumps(stream.compiled))
                else:
                    print pretty_json(json.dumps(stream.loaded))
            except KeyError as e:
                print "Unknown stream list name provided"
        else:
            print "Available stream packs:\n{0}".format(', '.join(sorted(self.streams_db.get_loaded_streams_names())))

    def complete_stream_db_show(self, text, line, begidx, endidx):
        return [x
                for x in self.streams_db.get_loaded_streams_names()
                if x.startswith(text)]

    def do_stream_db_remove(self, line):
        '''Removes a single loaded stream packs from loaded stream pack repository\n'''
        args = line.split()
        if args:
            removed_streams = self.streams_db.remove_stream_packs(*args)
            if removed_streams:
                print green("The following stream packs were removed:")
                print bold(", ".join(sorted(removed_streams)))
                print format_text("[SUCCESS]\n", 'green', 'bold')
            else:
                print red("No streams were removed. Make sure to provide valid stream pack names.")
        else:
            print magenta("Please provide stream pack name(s), separated with spaces.")

    def do_stream_db_clear(self, line):
        '''Clears all loaded stream packs from loaded stream pack repository\n'''
        self.streams_db.clear()
        print format_text("[SUCCESS]\n", 'green', 'bold')


    def complete_stream_db_remove(self, text, line, begidx, endidx):
        return [x
                for x in self.streams_db.get_loaded_streams_names()
                if x.startswith(text)]


    def do_attach(self, line):
        '''Assign loaded stream pack into specified ports on TRex\n'''
        args = line.split()
        if len(args) >= 2:
            stream_pack_name = args[0]
            stream_list = self.streams_db.get_stream_pack(stream_pack_name) #user_streams[args[0]]
            if not stream_list:
                print "Provided stream list name '{0}' doesn't exists.".format(stream_pack_name)
                print format_text("[FAILED]\n", 'red', 'bold')
                return
            if args[0] == "all":
                ask = ConfirmMenu('Are you sure you want to release all acquired ports? ')
                rc = ask.show()
                if rc == False:
                    print yellow("[ABORTED]\n")
                    return
                else:
                    port_list = self.stateless_client.get_acquired_ports()
            else:
                port_list = self.extract_port_ids_from_line(' '.join(args[1:]))
            owned = set(self.stateless_client.get_acquired_ports())
            try:
                if set(port_list).issubset(owned):
                    res_ok, log = self.stateless_client.add_stream_pack(port_list, *stream_list.compiled)
                    # res_ok, msg = self.stateless_client.add_stream(port_list, stream_list.compiled)
                    self.prompt_response(log)
                    if not res_ok:
                        print format_text("[FAILED]\n", 'red', 'bold')
                        return
                    print format_text("[SUCCESS]\n", 'green', 'bold')
                    return
                else:
                    print "Not all desired ports are acquired.\n" \
                          "Acquired ports are: {acq}\n" \
                          "Requested ports:    {req}\n" \
                          "Missing ports:      {miss}".format(acq=list(owned),
                                                              req=port_list,
                                                              miss=list(set(port_list).difference(owned)))
                    print format_text("[FAILED]\n", 'red', 'bold')
            except ValueError as e:
                print magenta(str(e))
                print format_text("[FAILED]\n", 'red', 'bold')
        else:
            print magenta("Please provide list name and ports to attach to, "
                          "or specify 'all' to attach all owned ports.\n")

    def complete_attach(self, text, line, begidx, endidx):
        arg_num = len(line.split()) - 1
        if arg_num == 1:
            # return optional streams packs
            if line.endswith(" "):
                return self.port_auto_complete(text, line, begidx, endidx)
            return [x
                    for x in self.streams_db.get_loaded_streams_names()
                    if x.startswith(text)]
        elif arg_num >= 2:
            # return optional ports to attach to
            return self.port_auto_complete(text, line, begidx, endidx)
        else:
            return [text]

    def prompt_response(self, response_obj):
        resp_list = response_obj if isinstance(response_obj, list) else [response_obj]
        def format_return_status(return_status):
            if return_status:
                return green("OK")
            else:
                return red("FAIL")

        for response in resp_list:
            response_str = "{id:^3} - {msg} ({stat})".format(id=response.id,
                                                             msg=response.msg,
                                                             stat=format_return_status(response.success))
            print response_str
        return

    def do_remove_all_streams(self, line):
        '''Acquire ports\n'''

        # make sure that the user wants to acquire all
        args = line.split()
        if len(args) < 1:
            print magenta("Please provide a list of ports separated by spaces, "
                          "or specify 'all' to remove from all acquired ports")
            return
        if args[0] == "all":
            ask = ConfirmMenu('Are you sure you want to remove all stream packs from all acquired ports? ')
            rc = ask.show()
            if rc == False:
                print yellow("[ABORTED]\n")
                return
            else:
                port_list = self.stateless_client.get_acquired_ports()
        else:
            port_list = self.extract_port_ids_from_line(line)

        # rc, resp_list = self.stateless_client.take_ownership(port_list, force)
        try:
            res_ok, log = self.stateless_client.remove_all_streams(port_list)
            self.prompt_response(log)
            if not res_ok:
                print format_text("[FAILED]\n", 'red', 'bold')
                return
            print format_text("[SUCCESS]\n", 'green', 'bold')
        except ValueError as e:
            print magenta(str(e))
            print format_text("[FAILED]\n", 'red', 'bold')

    def complete_remove_all_streams(self, text, line, begidx, endidx):
        return self.port_auto_complete(text, line, begidx, endidx)

    def do_start_traffic(self, line):
        '''Start pre-submitted traffic in specified ports on TRex\n'''
        # make sure that the user wants to acquire all
        args = line.split()
        if len(args) < 1:
            print magenta("Please provide a list of ports separated by spaces, "
                          "or specify 'all' to start traffic on all acquired ports")
            return
        if args[0] == "all":
            ask = ConfirmMenu('Are you sure you want to start traffic at all acquired ports? ')
            rc = ask.show()
            if rc == False:
                print yellow("[ABORTED]\n")
                return
            else:
                port_list = self.stateless_client.get_acquired_ports()
        else:
            port_list = self.extract_port_ids_from_line(line)

        try:
            res_ok, log = self.stateless_client.start_traffic(port_list)
            self.prompt_response(log)
            if not res_ok:
                print format_text("[FAILED]\n", 'red', 'bold')
                return
            print format_text("[SUCCESS]\n", 'green', 'bold')
        except ValueError as e:
            print magenta(str(e))
            print format_text("[FAILED]\n", 'red', 'bold')

    def complete_start_traffic(self, text, line, begidx, endidx):
        return self.port_auto_complete(text, line, begidx, endidx)

    def do_stop_traffic(self, line):
        '''Stop active traffic in specified ports on TRex\n'''
        # make sure that the user wants to acquire all
        args = line.split()
        if len(args) < 1:
            print magenta("Please provide a list of ports separated by spaces, "
                          "or specify 'all' to stop traffic on all acquired ports")
            return
        if args[0] == "all":
            ask = ConfirmMenu('Are you sure you want to start traffic at all acquired ports? ')
            rc = ask.show()
            if rc == False:
                print yellow("[ABORTED]\n")
                return
            else:
                port_list = self.stateless_client.get_active_ports()
        else:
            port_list = self.extract_port_ids_from_line(line)

        try:
            res_ok, log = self.stateless_client.stop_traffic(port_list)
            self.prompt_response(log)
            if not res_ok:
                print format_text("[FAILED]\n", 'red', 'bold')
                return
            print format_text("[SUCCESS]\n", 'green', 'bold')
        except ValueError as e:
            print magenta(str(e))
            print format_text("[FAILED]\n", 'red', 'bold')

    def complete_stop_traffic(self, text, line, begidx, endidx):
        return self.port_auto_complete(text, line, begidx, endidx, active=True)

    # aliasing
    do_exit = do_EOF = do_q = do_quit

def setParserOptions():
    parser = argparse.ArgumentParser(prog="trex_console.py")

    parser.add_argument("-s", "--server", help = "TRex Server [default is localhost]",
                        default = "localhost",
                        type = str)

    parser.add_argument("-p", "--port", help = "TRex Server Port  [default is 5050]\n",
                        default = 5050,
                        type = int)

    parser.add_argument("-z", "--pub", help = "TRex Async Publisher Port  [default is 4500]\n",
                        default = 4500,
                        type = int)

    parser.add_argument("-u", "--user", help = "User Name  [default is currently logged in user]\n",
                        default = get_current_user(),
                        type = str)

    parser.add_argument("--verbose", dest="verbose",
                        action="store_true", help="Switch ON verbose option. Default is: OFF.",
                        default = False)

    return parser

def main():
    parser = setParserOptions()
    options = parser.parse_args()

    # Stateless client connection
    stateless_client = CTRexStatelessClient(options.user, options.server, options.port, options.pub)

    # console
    try:
        console = TRexConsole(stateless_client, options.verbose)
        console.cmdloop()
    except KeyboardInterrupt as e:
        print "\n\n*** Caught Ctrl + C... Exiting...\n\n"
        return

if __name__ == '__main__':
    main()