#!/usr/bin/python
#
# This file is part of Ansible
#
# Ansible 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.
#
# Ansible 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 Ansible.  If not, see <http://www.gnu.org/licenses/>.
#

DOCUMENTATION = '''
---
module: nxos_vpc_interface
version_added: "2.2"
short_description: Manages interface VPC configuration
description:
    - Manages interface VPC configuration
extends_documentation_fragment: nxos
author:
    - Jason Edelman (@jedelman8)
    - Gabriele Gerbino (@GGabriele)
notes:
    - Either vpc or peer_link param is required, but not both.
    - C(state)=absent removes whatever VPC config is on a port-channel
      if one exists.
    - Re-assigning a vpc or peerlink from one portchannel to another is not
      supported.  The module will force the user to unconfigure an existing
      vpc/pl before configuring the same value on a new portchannel
options:
    portchannel:
        description:
            - group number of the portchannel that will be configured
        required: true
    vpc:
        description:
            - vpc group/id that will be configured on associated portchannel
        required: false
        default: null
    peer_link:
        description:
            - Set to true/false for peer link config on assoicated portchannel
        required: false
        default: null
    state:
        description:
            - Manages desired state of the resource
        required: true
        choices: ['present','absent']
'''

EXAMPLES = '''
- nxos_vpc_portchannel:
    portchannel=10
    vpc=100
    username: "{{ un }}"
    password: "{{ pwd }}"
    host: "{{ inventory_hostname }}"
'''

RETURN = '''
proposed:
    description: k/v pairs of parameters passed into module
    returned: always
    type: dict
    sample: {"portchannel": "100", "vpc": "10"}
existing:
    description: k/v pairs of existing configuration
    type: dict
    sample: {}
end_state:
    description: k/v pairs of configuration after module execution
    returned: always
    type: dict
    sample:  {"peer-link": false, "portchannel": "100", "vpc": "10"}
updates:
    description: commands sent to the device
    returned: always
    type: list
    sample: ["interface port-channel100", "vpc 10"]
changed:
    description: check to see if a change was made on the device
    returned: always
    type: boolean
    sample: true
'''

# COMMON CODE FOR MIGRATION

import re
import time
import collections
import itertools
import shlex
import json

from ansible.module_utils.basic import AnsibleModule, env_fallback, get_exception
from ansible.module_utils.basic import BOOLEANS_TRUE, BOOLEANS_FALSE
from ansible.module_utils.shell import Shell, ShellError, HAS_PARAMIKO
from ansible.module_utils.netcfg import parse
from ansible.module_utils.urls import fetch_url


DEFAULT_COMMENT_TOKENS = ['#', '!']

class ConfigLine(object):

    def __init__(self, text):
        self.text = text
        self.children = list()
        self.parents = list()
        self.raw = None

    @property
    def line(self):
        line = ['set']
        line.extend([p.text for p in self.parents])
        line.append(self.text)
        return ' '.join(line)

    def __str__(self):
        return self.raw

    def __eq__(self, other):
        if self.text == other.text:
            return self.parents == other.parents

    def __ne__(self, other):
        return not self.__eq__(other)

def ignore_line(text, tokens=None):
    for item in (tokens or DEFAULT_COMMENT_TOKENS):
        if text.startswith(item):
            return True

def get_next(iterable):
    item, next_item = itertools.tee(iterable, 2)
    next_item = itertools.islice(next_item, 1, None)
    return itertools.izip_longest(item, next_item)

def parse(lines, indent, comment_tokens=None):
    toplevel = re.compile(r'\S')
    childline = re.compile(r'^\s*(.+)$')

    ancestors = list()
    config = list()

    for line in str(lines).split('\n'):
        text = str(re.sub(r'([{};])', '', line)).strip()

        cfg = ConfigLine(text)
        cfg.raw = line

        if not text or ignore_line(text, comment_tokens):
            continue

        # handle top level commands
        if toplevel.match(line):
            ancestors = [cfg]

        # handle sub level commands
        else:
            match = childline.match(line)
            line_indent = match.start(1)
            level = int(line_indent / indent)
            parent_level = level - 1

            cfg.parents = ancestors[:level]

            if level > len(ancestors):
                config.append(cfg)
                continue

            for i in range(level, len(ancestors)):
                ancestors.pop()

            ancestors.append(cfg)
            ancestors[parent_level].children.append(cfg)

        config.append(cfg)

    return config


class CustomNetworkConfig(object):

    def __init__(self, indent=None, contents=None, device_os=None):
        self.indent = indent or 1
        self._config = list()
        self._device_os = device_os

        if contents:
            self.load(contents)

    @property
    def items(self):
        return self._config

    @property
    def lines(self):
        lines = list()
        for item, next_item in get_next(self.items):
            if next_item is None:
                lines.append(item.line)
            elif not next_item.line.startswith(item.line):
                lines.append(item.line)
        return lines

    def __str__(self):
        text = ''
        for item in self.items:
            if not item.parents:
                expand = self.get_section(item.text)
                text += '%s\n' % self.get_section(item.text)
        return str(text).strip()

    def load(self, contents):
        self._config = parse(contents, indent=self.indent)

    def load_from_file(self, filename):
        self.load(open(filename).read())

    def get(self, path):
        if isinstance(path, basestring):
            path = [path]
        for item in self._config:
            if item.text == path[-1]:
                parents = [p.text for p in item.parents]
                if parents == path[:-1]:
                    return item

    def search(self, regexp, path=None):
        regex = re.compile(r'^%s' % regexp, re.M)

        if path:
            parent = self.get(path)
            if not parent or not parent.children:
                return
            children = [c.text for c in parent.children]
            data = '\n'.join(children)
        else:
            data = str(self)

        match = regex.search(data)
        if match:
            if match.groups():
                values = match.groupdict().values()
                groups = list(set(match.groups()).difference(values))
                return (groups, match.groupdict())
            else:
                return match.group()

    def findall(self, regexp):
        regexp = r'%s' % regexp
        return re.findall(regexp, str(self))

    def expand(self, obj, items):
        block = [item.raw for item in obj.parents]
        block.append(obj.raw)

        current_level = items
        for b in block:
            if b not in current_level:
                current_level[b] = collections.OrderedDict()
            current_level = current_level[b]
        for c in obj.children:
            if c.raw not in current_level:
                current_level[c.raw] = collections.OrderedDict()

    def to_lines(self, section):
        lines = list()
        for entry in section[1:]:
            line = ['set']
            line.extend([p.text for p in entry.parents])
            line.append(entry.text)
            lines.append(' '.join(line))
        return lines

    def to_block(self, section):
        return '\n'.join([item.raw for item in section])

    def get_section(self, path):
        try:
            section = self.get_section_objects(path)
            if self._device_os == 'junos':
                return self.to_lines(section)
            return self.to_block(section)
        except ValueError:
            return list()

    def get_section_objects(self, path):
        if not isinstance(path, list):
            path = [path]
        obj = self.get_object(path)
        if not obj:
            raise ValueError('path does not exist in config')
        return self.expand_section(obj)

    def expand_section(self, configobj, S=None):
        if S is None:
            S = list()
        S.append(configobj)
        for child in configobj.children:
            if child in S:
                continue
            self.expand_section(child, S)
        return S

    def flatten(self, data, obj=None):
        if obj is None:
            obj = list()
        for k, v in data.items():
            obj.append(k)
            self.flatten(v, obj)
        return obj

    def get_object(self, path):
        for item in self.items:
            if item.text == path[-1]:
                parents = [p.text for p in item.parents]
                if parents == path[:-1]:
                    return item

    def get_children(self, path):
        obj = self.get_object(path)
        if obj:
            return obj.children

    def difference(self, other, path=None, match='line', replace='line'):
        updates = list()

        config = self.items
        if path:
            config = self.get_children(path) or list()

        if match == 'line':
            for item in config:
                if item not in other.items:
                    updates.append(item)

        elif match == 'strict':
            if path:
                current = other.get_children(path) or list()
            else:
                current = other.items

            for index, item in enumerate(config):
                try:
                    if item != current[index]:
                        updates.append(item)
                except IndexError:
                    updates.append(item)

        elif match == 'exact':
            if path:
                current = other.get_children(path) or list()
            else:
                current = other.items

            if len(current) != len(config):
                updates.extend(config)
            else:
                for ours, theirs in itertools.izip(config, current):
                    if ours != theirs:
                        updates.extend(config)
                        break

        if self._device_os == 'junos':
            return updates

        diffs = collections.OrderedDict()
        for update in updates:
            if replace == 'block' and update.parents:
                update = update.parents[-1]
            self.expand(update, diffs)

        return self.flatten(diffs)

    def replace(self, replace, text=None, regex=None, parents=None,
            add_if_missing=False, ignore_whitespace=False):
        match = None

        parents = parents or list()
        if text is None and regex is None:
            raise ValueError('missing required arguments')

        if not regex:
            regex = ['^%s$' % text]

        patterns = [re.compile(r, re.I) for r in to_list(regex)]

        for item in self.items:
            for regexp in patterns:
                if ignore_whitespace is True:
                    string = item.text
                else:
                    string = item.raw
                if regexp.search(item.text):
                    if item.text != replace:
                        if parents == [p.text for p in item.parents]:
                            match = item
                            break

        if match:
            match.text = replace
            indent = len(match.raw) - len(match.raw.lstrip())
            match.raw = replace.rjust(len(replace) + indent)

        elif add_if_missing:
            self.add(replace, parents=parents)


    def add(self, lines, parents=None):
        """Adds one or lines of configuration
        """

        ancestors = list()
        offset = 0
        obj = None

        ## global config command
        if not parents:
            for line in to_list(lines):
                item = ConfigLine(line)
                item.raw = line
                if item not in self.items:
                    self.items.append(item)

        else:
            for index, p in enumerate(parents):
                try:
                    i = index + 1
                    obj = self.get_section_objects(parents[:i])[0]
                    ancestors.append(obj)

                except ValueError:
                    # add parent to config
                    offset = index * self.indent
                    obj = ConfigLine(p)
                    obj.raw = p.rjust(len(p) + offset)
                    if ancestors:
                        obj.parents = list(ancestors)
                        ancestors[-1].children.append(obj)
                    self.items.append(obj)
                    ancestors.append(obj)

            # add child objects
            for line in to_list(lines):
                # check if child already exists
                for child in ancestors[-1].children:
                    if child.text == line:
                        break
                else:
                    offset = len(parents) * self.indent
                    item = ConfigLine(line)
                    item.raw = line.rjust(len(line) + offset)
                    item.parents = ancestors
                    ancestors[-1].children.append(item)
                    self.items.append(item)


def argument_spec():
    return dict(
        # config options
        running_config=dict(aliases=['config']),
        save_config=dict(type='bool', default=False, aliases=['save'])
    )
nxos_argument_spec = argument_spec()


NET_PASSWD_RE = re.compile(r"[\r\n]?password: $", re.I)

NET_COMMON_ARGS = dict(
    host=dict(required=True),
    port=dict(type='int'),
    username=dict(fallback=(env_fallback, ['ANSIBLE_NET_USERNAME'])),
    password=dict(no_log=True, fallback=(env_fallback, ['ANSIBLE_NET_PASSWORD'])),
    ssh_keyfile=dict(fallback=(env_fallback, ['ANSIBLE_NET_SSH_KEYFILE']), type='path'),
    transport=dict(default='cli', choices=['cli', 'nxapi']),
    use_ssl=dict(default=False, type='bool'),
    validate_certs=dict(default=True, type='bool'),
    provider=dict(type='dict'),
    timeout=dict(default=10, type='int')
)

NXAPI_COMMAND_TYPES = ['cli_show', 'cli_show_ascii', 'cli_conf', 'bash']

NXAPI_ENCODINGS = ['json', 'xml']

CLI_PROMPTS_RE = [
    re.compile(r'[\r\n]?[a-zA-Z]{1}[a-zA-Z0-9-]*[>|#|%](?:\s*)$'),
    re.compile(r'[\r\n]?[a-zA-Z]{1}[a-zA-Z0-9-]*\(.+\)#(?:\s*)$')
]

CLI_ERRORS_RE = [
    re.compile(r"% ?Error"),
    re.compile(r"^% \w+", re.M),
    re.compile(r"% ?Bad secret"),
    re.compile(r"invalid input", re.I),
    re.compile(r"(?:incomplete|ambiguous) command", re.I),
    re.compile(r"connection timed out", re.I),
    re.compile(r"[^\r\n]+ not found", re.I),
    re.compile(r"'[^']' +returned error code: ?\d+"),
    re.compile(r"syntax error"),
    re.compile(r"unknown command")
]


def to_list(val):
    if isinstance(val, (list, tuple)):
        return list(val)
    elif val is not None:
        return [val]
    else:
        return list()


class Nxapi(object):

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

        # sets the module_utils/urls.py req parameters
        self.module.params['url_username'] = module.params['username']
        self.module.params['url_password'] = module.params['password']

        self.url = None
        self._nxapi_auth = None

    def _get_body(self, commands, command_type, encoding, version='1.0', chunk='0', sid=None):
        """Encodes a NXAPI JSON request message
        """
        if isinstance(commands, (list, set, tuple)):
            commands = ' ;'.join(commands)

        if encoding not in NXAPI_ENCODINGS:
            msg = 'invalid encoding, received %s, exceped one of %s' % \
                    (encoding, ','.join(NXAPI_ENCODINGS))
            self.module_fail_json(msg=msg)

        msg = {
            'version': version,
            'type': command_type,
            'chunk': chunk,
            'sid': sid,
            'input': commands,
            'output_format': encoding
        }
        return dict(ins_api=msg)

    def connect(self):
        host = self.module.params['host']
        port = self.module.params['port']

        if self.module.params['use_ssl']:
            proto = 'https'
            if not port:
                port = 443
        else:
            proto = 'http'
            if not port:
                port = 80

        self.url = '%s://%s:%s/ins' % (proto, host, port)

    def send(self, commands, command_type='cli_show_ascii', encoding='json'):
        """Send commands to the device.
        """
        clist = to_list(commands)

        if command_type not in NXAPI_COMMAND_TYPES:
            msg = 'invalid command_type, received %s, exceped one of %s' % \
                    (command_type, ','.join(NXAPI_COMMAND_TYPES))
            self.module_fail_json(msg=msg)

        data = self._get_body(clist, command_type, encoding)
        data = self.module.jsonify(data)

        headers = {'Content-Type': 'application/json'}
        if self._nxapi_auth:
            headers['Cookie'] = self._nxapi_auth

        response, headers = fetch_url(self.module, self.url, data=data,
                headers=headers, method='POST')

        self._nxapi_auth = headers.get('set-cookie')

        if headers['status'] != 200:
            self.module.fail_json(**headers)

        response = self.module.from_json(response.read())
        result = list()

        output = response['ins_api']['outputs']['output']
        for item in to_list(output):
            if item['code'] != '200':
                self.module.fail_json(**item)
            else:
                result.append(item['body'])

        return result


class Cli(object):

    def __init__(self, module):
        self.module = module
        self.shell = None

    def connect(self, **kwargs):
        host = self.module.params['host']
        port = self.module.params['port'] or 22

        username = self.module.params['username']
        password = self.module.params['password']
        timeout = self.module.params['timeout']
        key_filename = self.module.params['ssh_keyfile']

        allow_agent = (key_filename is not None) or (key_filename is None and password is None)

        try:
            self.shell = Shell(kickstart=False, prompts_re=CLI_PROMPTS_RE,
                    errors_re=CLI_ERRORS_RE)
            self.shell.open(host, port=port, username=username,
                    password=password, key_filename=key_filename,
                    allow_agent=allow_agent, timeout=timeout)
        except ShellError:
            e = get_exception()
            msg = 'failed to connect to %s:%s - %s' % (host, port, str(e))
            self.module.fail_json(msg=msg)

    def send(self, commands, encoding='text'):
        try:
            return self.shell.send(commands)
        except ShellError:
            e = get_exception()
            self.module.fail_json(msg=e.message, commands=commands)


class NetworkModule(AnsibleModule):

    def __init__(self, *args, **kwargs):
        super(NetworkModule, self).__init__(*args, **kwargs)
        self.connection = None
        self._config = None
        self._connected = False

    @property
    def connected(self):
        return self._connected

    @property
    def config(self):
        if not self._config:
            self._config = self.get_config()
        return self._config

    def _load_params(self):
        super(NetworkModule, self)._load_params()
        provider = self.params.get('provider') or dict()
        for key, value in provider.items():
            if key in NET_COMMON_ARGS:
                if self.params.get(key) is None and value is not None:
                    self.params[key] = value

    def connect(self):
        cls = globals().get(str(self.params['transport']).capitalize())
        try:
            self.connection = cls(self)
        except TypeError:
            e = get_exception()
            self.fail_json(msg=e.message)

        self.connection.connect()

        if self.params['transport'] == 'cli':
            self.connection.send('terminal length 0')

        self._connected = True

    def configure(self, commands):
        commands = to_list(commands)
        if self.params['transport'] == 'cli':
            return self.configure_cli(commands)
        else:
            return self.execute(commands, command_type='cli_conf')

    def configure_cli(self, commands):
        commands = to_list(commands)
        commands.insert(0, 'configure')
        responses = self.execute(commands)
        responses.pop(0)
        return responses

    def execute(self, commands, **kwargs):
        if not self.connected:
            self.connect()
        return self.connection.send(commands, **kwargs)

    def disconnect(self):
        self.connection.close()
        self._connected = False

    def parse_config(self, cfg):
        return parse(cfg, indent=2)

    def get_config(self):
        cmd = 'show running-config'
        if self.params.get('include_defaults'):
            cmd += ' all'
        response = self.execute(cmd)
        return response[0]


def get_module(**kwargs):
    """Return instance of NetworkModule
    """
    argument_spec = NET_COMMON_ARGS.copy()
    if kwargs.get('argument_spec'):
        argument_spec.update(kwargs['argument_spec'])
    kwargs['argument_spec'] = argument_spec

    module = NetworkModule(**kwargs)

    if module.params['transport'] == 'cli' and not HAS_PARAMIKO:
        module.fail_json(msg='paramiko is required but does not appear to be installed')

    return module


def custom_get_config(module, include_defaults=False):
    config = module.params['running_config']
    if not config:
        cmd = 'show running-config'
        if module.params['include_defaults']:
            cmd += ' all'
        if module.params['transport'] == 'nxapi':
            config = module.execute([cmd], command_type='cli_show_ascii')[0]
        else:
            config = module.execute([cmd])[0]

    return CustomNetworkConfig(indent=2, contents=config)

def load_config(module, candidate):
    config = custom_get_config(module)

    commands = candidate.difference(config)
    commands = [str(c).strip() for c in commands]

    save_config = module.params['save_config']

    result = dict(changed=False)

    if commands:
        if not module.check_mode:
            module.configure(commands)
            if save_config:
                module.config.save_config()

        result['changed'] = True
        result['updates'] = commands

    return result
# END OF COMMON CODE

def execute_config_command(commands, module):
    try:
        output = module.configure(commands)
    except ShellError:
        clie = get_exception()
        module.fail_json(msg='Error sending CLI commands',
                         error=str(clie), commands=commands)
    return output


def get_cli_body_ssh(command, response, module):
    """Get response for when transport=cli.  This is kind of a hack and mainly
    needed because these modules were originally written for NX-API.  And
    not every command supports "| json" when using cli/ssh.
    """
    if '^' == response[0]:
        body = []
    elif 'running' in command or 'xml' in response[0]:
        body = response
    else:
        try:
            body = [json.loads(response[0])]
        except ValueError:
            module.fail_json(msg='Command does not support JSON output',
                             command=command)
    return body


def execute_show(cmds, module, command_type=None):
    try:
        if command_type:
            response = module.execute(cmds, command_type=command_type)
        else:
            response = module.execute(cmds)
    except ShellError:
        clie = get_exception()
        module.fail_json(msg='Error sending {0}'.format(cmds),
                         error=str(clie))
    return response


def execute_show_command(command, module, command_type='cli_show'):
    if module.params['transport'] == 'cli':
        command += ' | json'
        cmds = [command]
        response = execute_show(cmds, module)
        body = get_cli_body_ssh(command, response, module)
    elif module.params['transport'] == 'nxapi':
        cmds = [command]
        body = execute_show(cmds, module, command_type=command_type)

    return body


def flatten_list(command_lists):
    flat_command_list = []
    for command in command_lists:
        if isinstance(command, list):
            flat_command_list.extend(command)
        else:
            flat_command_list.append(command)
    return flat_command_list


def get_portchannel_list(module):
    command = 'show port-channel summary'
    portchannels = []
    pc_list = []

    body = execute_show_command(command, module)

    try:
        pc_list = body[0]['TABLE_channel']['ROW_channel']
    except (KeyError, AttributeError):
        return portchannels

    if pc_list:
        if isinstance(pc_list, dict):
            pc_list = [pc_list]

        for pc in pc_list:
            portchannels.append(pc['group'])

    return portchannels


def get_existing_portchannel_to_vpc_mappings(module):
    command = 'show vpc brief'
    pc_vpc_mapping = {}

    body = execute_show_command(command, module)

    try:
        vpc_table = body[0]['TABLE_vpc']['ROW_vpc']
    except (KeyError, AttributeError, TypeError):
        vpc_table = None

    if vpc_table:
        if isinstance(vpc_table, dict):
            vpc_table = [vpc_table]

        for vpc in vpc_table:
            pc_vpc_mapping[str(vpc['vpc-id'])] = str(vpc['vpc-ifindex'])

    return pc_vpc_mapping


def peer_link_exists(module):
    found = False
    run = get_vpc_running_config(module)

    vpc_list = run.split('\n')
    for each in vpc_list:
        if 'peer-link' in each:
            found = True
    return found


def get_vpc_running_config(module):
    command = 'show running section vpc'
    body = execute_show_command(command, module,
                                command_type='cli_show_ascii')[0]

    return body


def get_active_vpc_peer_link(module):
    command = 'show vpc brief'
    peer_link = None
    body = execute_show_command(command, module)
    try:
        peer_link = body[0]['TABLE_peerlink']['ROW_peerlink']['peerlink-ifindex']
    except (KeyError, AttributeError):
        return peer_link

    return peer_link


def get_portchannel_vpc_config(module, portchannel):
    command = 'show vpc brief'
    peer_link_pc = None
    peer_link = False
    vpc = ""
    pc = ""
    config = {}

    body = execute_show_command(command, module)

    try:
        table = body[0]['TABLE_peerlink']['ROW_peerlink']
    except (KeyError, AttributeError, TypeError):
        table = {}

    if table:
        peer_link_pc = table.get('peerlink-ifindex', None)

    if peer_link_pc:
        plpc = str(peer_link_pc[2:])
        if portchannel == plpc:
            config['portchannel'] = portchannel
            config['peer-link'] = True
            config['vpc'] = vpc

    mapping = get_existing_portchannel_to_vpc_mappings(module)

    for existing_vpc, port_channel in mapping.iteritems():
        port_ch = str(port_channel[2:])
        if port_ch == portchannel:
            pc = port_ch
            vpc = str(existing_vpc)

            config['portchannel'] = pc
            config['peer-link'] = peer_link
            config['vpc'] = vpc

    return config


def get_commands_to_config_vpc_interface(portchannel, delta, config_value, existing):
    commands = []

    if delta.get('peer-link') is False and existing.get('peer-link') is True:
        command = 'no vpc peer-link'
        commands.append('no vpc peer-link')
        commands.insert(0, 'interface port-channel{0}'.format(portchannel))

    elif delta.get('peer-link') or not existing.get('vpc'):
        command = 'vpc {0}'.format(config_value)
        commands.append(command)
        commands.insert(0, 'interface port-channel{0}'.format(portchannel))

    return commands


def main():
    argument_spec = dict(
            portchannel=dict(required=True, type='str'),
            vpc=dict(required=False, type='str'),
            peer_link=dict(required=False, type='bool'),
            state=dict(choices=['absent', 'present'], default='present'),
    )
    module = get_module(argument_spec=argument_spec,
                        mutually_exclusive=[['vpc', 'peer_link']],
                        supports_check_mode=True)

    portchannel = module.params['portchannel']
    vpc = module.params['vpc']
    peer_link = module.params['peer_link']
    state = module.params['state']

    changed = False
    args = {'portchannel': portchannel, 'vpc': vpc, 'peer-link': peer_link}
    active_peer_link = None

    if portchannel not in get_portchannel_list(module):
        module.fail_json(msg="The portchannel you are trying to make a"
                             " VPC or PL is not created yet. "
                             "Create it first!")
    if vpc:
        mapping = get_existing_portchannel_to_vpc_mappings(module)

        if vpc in mapping.keys() and portchannel != mapping[vpc].strip('Po'):
            module.fail_json(msg="This vpc is already configured on "
                                 "another portchannel.  Remove it first "
                                 "before trying to assign it here. ",
                             existing_portchannel=mapping[vpc])

        for vpcid, existing_pc in mapping.iteritems():
            if portchannel == existing_pc.strip('Po') and vpcid != vpc:
                module.fail_json(msg="This portchannel already has another"
                                     " VPC configured.  Remove it first "
                                     "before assigning this one",
                                 existing_vpc=vpcid)

        if peer_link_exists(module):
            active_peer_link = get_active_vpc_peer_link(module)
            if active_peer_link[-2:] == portchannel:
                module.fail_json(msg="That port channel is the current "
                                     "PEER LINK.  Remove it if you want it"
                                     " to be a VPC")
        config_value = vpc

    elif peer_link is not None:
        if peer_link_exists(module):
            active_peer_link = get_active_vpc_peer_link(module)[2::]
            if active_peer_link != portchannel:
                if peer_link:
                    module.fail_json(msg="A peer link already exists on"
                                         " the device.  Remove it first",
                                     current_peer_link='Po{0}'.format(
                                     active_peer_link))
        config_value = 'peer-link'


    proposed = dict((k, v) for k, v in args.iteritems() if v is not None)
    existing = get_portchannel_vpc_config(module, portchannel)
    end_state = existing
    commands = []

    if state == 'present':
        delta = dict(set(proposed.iteritems()).difference(existing.iteritems()))
        if delta:
            command = get_commands_to_config_vpc_interface(
                portchannel,
                delta,
                config_value,
                existing
                )
            commands.append(command)

    elif state == 'absent':
        if existing.get('vpc'):
            command = ['no vpc']
            commands.append(command)
        elif existing.get('peer-link'):
            command = ['no vpc peer-link']
            commands.append(command)
        if commands:
            commands.insert(0, ['interface port-channel{0}'.format(portchannel)])

    cmds = flatten_list(commands)
    if cmds:
        if module.check_mode:
            module.exit_json(changed=True, commands=cmds)
        else:
            changed = True
            output = execute_config_command(cmds, module)
            if module.params['transport'] == 'cli':
                output = ' '.join(output)
                if 'error' in output.lower():
                    module.fail_json(msg=output.replace('\n', ''))
            end_state = get_portchannel_vpc_config(module, portchannel)

    results = {}
    results['proposed'] = proposed
    results['existing'] = existing
    results['end_state'] = end_state
    results['updates'] = cmds
    results['changed'] = changed

    module.exit_json(**results)


if __name__ == '__main__':
    main()