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

# (c) 2017, Ansible by Red Hat, inc
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

from __future__ import absolute_import, division, print_function

__metaclass__ = type


DOCUMENTATION = """
module: nxos_linkagg
extends_documentation_fragment:
- cisco.nxos.nxos
short_description: (deprecated, removed after 2022-06-01) Manage link
  aggregation groups on Cisco NXOS devices.
description:
- This module provides declarative management of link aggregation groups on Cisco
  NXOS devices.
version_added: 1.0.0
deprecated:
  alternative: nxos_lag_interfaces
  why: Updated modules released with more functionality.
  removed_at_date: '2022-06-01'
author:
- Trishna Guha (@trishnaguha)
notes:
- Tested against NXOSv 7.0(3)I5(1).
- C(state=absent) removes the portchannel config and interface if it already exists.
  If members to be removed are not explicitly passed, all existing members (if any),
  are removed.
- Members must be a list.
- LACP needs to be enabled first if active/passive modes are used.
options:
  group:
    description:
    - Channel-group number for the port-channel Link aggregation group.
    required: true
    type: str
  mode:
    description:
    - Mode for the link aggregation group.
    choices:
    - active
    - on
    - passive
    default: on
    type: str
  min_links:
    description:
    - Minimum number of ports required up before bringing up the link aggregation
      group.
    type: int
  members:
    description:
    - List of interfaces that will be managed in the link aggregation group.
    type: list
  force:
    description:
    - When true it forces link aggregation group members to match what is declared
      in the members param. This can be used to remove members.
    type: bool
    default: no
  aggregate:
    description: List of link aggregation definitions.
    type: list
  state:
    description:
    - State of the link aggregation group.
    default: present
    choices:
    - present
    - absent
    type: str
  purge:
    description:
    - Purge links not defined in the I(aggregate) parameter.
    type: bool
    default: no


"""

EXAMPLES = """
- name: create link aggregation group
  cisco.nxos.nxos_linkagg:
    group: 99
    state: present

- name: delete link aggregation group
  cisco.nxos.nxos_linkagg:
    group: 99
    state: absent

- name: set link aggregation group to members
  cisco.nxos.nxos_linkagg:
    group: 10
    min_links: 3
    mode: active
    members:
    - Ethernet1/2
    - Ethernet1/4

- name: remove link aggregation group from Ethernet1/2
  cisco.nxos.nxos_linkagg:
    group: 10
    min_links: 3
    mode: active
    members:
    - Ethernet1/4

- name: Create aggregate of linkagg definitions
  cisco.nxos.nxos_linkagg:
    aggregate:
    - {group: 3}
    - {group: 100, min_links: 3}

- name: Remove aggregate of linkagg definitions
  cisco.nxos.nxos_linkagg:
    aggregate:
    - {group: 3}
    - {group: 100, min_links: 3}
    state: absent
"""

RETURN = """
commands:
  description: The list of configuration mode commands to send to the device
  returned: always, except for the platforms that use Netconf transport to manage the device.
  type: list
  sample:
    - interface port-channel 30
    - lacp min-links 5
    - interface Ethernet2/1
    - channel-group 30 mode active
    - no interface port-channel 30
"""

import re
from copy import deepcopy

from ansible_collections.cisco.nxos.plugins.module_utils.network.nxos.nxos import (
    get_config,
    load_config,
    run_commands,
)
from ansible_collections.cisco.nxos.plugins.module_utils.network.nxos.nxos import (
    nxos_argument_spec,
)
from ansible_collections.cisco.nxos.plugins.module_utils.network.nxos.nxos import (
    normalize_interface,
)
from ansible.module_utils.basic import AnsibleModule
from ansible_collections.ansible.netcommon.plugins.module_utils.network.common.utils import (
    remove_default_spec,
)


def search_obj_in_list(group, lst):
    for o in lst:
        if o["group"] == group:
            return o


def get_diff(w, obj):
    c = deepcopy(w)
    o = deepcopy(obj)

    if o["group"] == c["group"] and o.get("members") == c.get("members"):
        if "members" in o:
            del o["members"]
        if "members" in c:
            del c["members"]
        diff_dict = dict(set(c.items()) - set(o.items()))
        return diff_dict


def map_obj_to_commands(updates, module):
    commands = list()
    want, have = updates
    purge = module.params["purge"]
    force = module.params["force"]

    for w in want:
        group = w["group"]
        mode = w["mode"]
        min_links = w["min_links"]
        members = w.get("members") or []
        state = w["state"]
        del w["state"]

        obj_in_have = search_obj_in_list(group, have)

        if state == "absent":
            if obj_in_have:
                members_to_remove = list(
                    set(obj_in_have["members"]) - set(members)
                )
                if members_to_remove:
                    for m in members_to_remove:
                        commands.append("interface {0}".format(m))
                        commands.append(
                            "no channel-group {0}".format(obj_in_have["group"])
                        )
                        commands.append("exit")
                commands.append("no interface port-channel {0}".format(group))

        elif state == "present":
            if not obj_in_have:
                commands.append("interface port-channel {0}".format(group))
                if min_links != "None":
                    commands.append("lacp min-links {0}".format(min_links))
                commands.append("exit")
                if members:
                    for m in members:
                        commands.append("interface {0}".format(m))
                        if force:
                            commands.append(
                                "channel-group {0} force mode {1}".format(
                                    group, mode
                                )
                            )
                        else:
                            commands.append(
                                "channel-group {0} mode {1}".format(
                                    group, mode
                                )
                            )

            else:
                if members:
                    if not obj_in_have["members"]:
                        for m in members:
                            commands.append(
                                "interface port-channel {0}".format(group)
                            )
                            commands.append("exit")
                            commands.append("interface {0}".format(m))
                            if force:
                                commands.append(
                                    "channel-group {0} force mode {1}".format(
                                        group, mode
                                    )
                                )
                            else:
                                commands.append(
                                    "channel-group {0} mode {1}".format(
                                        group, mode
                                    )
                                )

                    elif set(members) != set(obj_in_have["members"]):
                        missing_members = list(
                            set(members) - set(obj_in_have["members"])
                        )
                        for m in missing_members:
                            commands.append(
                                "interface port-channel {0}".format(group)
                            )
                            commands.append("exit")
                            commands.append("interface {0}".format(m))
                            if force:
                                commands.append(
                                    "channel-group {0} force mode {1}".format(
                                        group, mode
                                    )
                                )
                            else:
                                commands.append(
                                    "channel-group {0} mode {1}".format(
                                        group, mode
                                    )
                                )

                        superfluous_members = list(
                            set(obj_in_have["members"]) - set(members)
                        )
                        for m in superfluous_members:
                            commands.append(
                                "interface port-channel {0}".format(group)
                            )
                            commands.append("exit")
                            commands.append("interface {0}".format(m))
                            commands.append(
                                "no channel-group {0}".format(group)
                            )

                    else:
                        diff = get_diff(w, obj_in_have)
                        if diff and "mode" in diff:
                            mode = diff["mode"]
                            for i in members:
                                commands.append("interface {0}".format(i))
                                if force:
                                    commands.append(
                                        "channel-group {0} force mode {1}".format(
                                            group, mode
                                        )
                                    )
                                else:
                                    commands.append(
                                        "channel-group {0} mode {1}".format(
                                            group, mode
                                        )
                                    )

    if purge:
        for h in have:
            obj_in_want = search_obj_in_list(h["group"], want)
            if not obj_in_want:
                commands.append(
                    "no interface port-channel {0}".format(h["group"])
                )

    return commands


def map_params_to_obj(module):
    obj = []
    aggregate = module.params.get("aggregate")
    if aggregate:
        for item in aggregate:
            for key in item:
                if item.get(key) is None:
                    item[key] = module.params[key]

            d = item.copy()
            d["group"] = str(d["group"])
            d["min_links"] = str(d["min_links"])
            if d["members"]:
                d["members"] = [normalize_interface(i) for i in d["members"]]

            obj.append(d)
    else:
        members = None
        if module.params["members"]:
            members = [
                normalize_interface(i) for i in module.params["members"]
            ]

        obj.append(
            {
                "group": str(module.params["group"]),
                "mode": module.params["mode"],
                "min_links": str(module.params["min_links"]),
                "members": members,
                "state": module.params["state"],
            }
        )

    return obj


def parse_min_links(module, group):
    min_links = None

    flags = ["| section interface.port-channel{0}".format(group)]
    config = get_config(module, flags=flags)
    match = re.search(r"lacp min-links (\S+)", config, re.M)
    if match:
        min_links = match.group(1)

    return min_links


def parse_mode(module, m):
    mode = None

    flags = ["| section interface.{0}".format(m)]
    config = get_config(module, flags=flags)
    match = re.search(
        r"channel-group [0-9]+ (force )?mode (\S+)", config, re.M
    )
    if match:
        mode = match.group(2)

    return mode


def get_members(channel):
    members = []
    if "TABLE_member" in channel.keys():
        interfaces = channel["TABLE_member"]["ROW_member"]
    else:
        return list()

    if isinstance(interfaces, dict):
        members.append(normalize_interface(interfaces.get("port")))
    elif isinstance(interfaces, list):
        for i in interfaces:
            members.append(normalize_interface(i.get("port")))

    return members


def parse_members(output, group):
    channels = output["TABLE_channel"]["ROW_channel"]

    if isinstance(channels, list):
        for channel in channels:
            if channel["group"] == group:
                members = get_members(channel)
    elif isinstance(channels, dict):
        if channels["group"] == group:
            members = get_members(channels)
    else:
        return list()

    return members


def parse_channel_options(module, output, channel):
    obj = {}

    group = channel["group"]
    obj["group"] = str(group)
    obj["min_links"] = parse_min_links(module, group)
    members = parse_members(output, group)
    obj["members"] = members
    for m in members:
        obj["mode"] = parse_mode(module, m)

    return obj


def map_config_to_obj(module):
    objs = list()
    output = run_commands(module, ["show port-channel summary | json"])[0]
    if not output:
        return list()

    try:
        channels = output["TABLE_channel"]["ROW_channel"]
    except (TypeError, KeyError):
        return objs

    if channels:
        if isinstance(channels, list):
            for channel in channels:
                obj = parse_channel_options(module, output, channel)
                objs.append(obj)

        elif isinstance(channels, dict):
            obj = parse_channel_options(module, output, channels)
            objs.append(obj)

    return objs


def main():
    """ main entry point for module execution
    """
    element_spec = dict(
        group=dict(type="str"),
        mode=dict(
            required=False,
            choices=["on", "active", "passive"],
            default="on",
            type="str",
        ),
        min_links=dict(required=False, default=None, type="int"),
        members=dict(required=False, default=None, type="list"),
        force=dict(required=False, default=False, type="bool"),
        state=dict(
            required=False, choices=["absent", "present"], default="present"
        ),
    )

    aggregate_spec = deepcopy(element_spec)
    aggregate_spec["group"] = dict(required=True)

    # remove default in aggregate spec, to handle common arguments
    remove_default_spec(aggregate_spec)

    argument_spec = dict(
        aggregate=dict(type="list", elements="dict", options=aggregate_spec),
        purge=dict(default=False, type="bool"),
    )

    argument_spec.update(element_spec)
    argument_spec.update(nxos_argument_spec)

    required_one_of = [["group", "aggregate"]]
    mutually_exclusive = [["group", "aggregate"]]
    module = AnsibleModule(
        argument_spec=argument_spec,
        required_one_of=required_one_of,
        mutually_exclusive=mutually_exclusive,
        supports_check_mode=True,
    )

    warnings = list()
    result = {"changed": False}
    if warnings:
        result["warnings"] = warnings

    want = map_params_to_obj(module)
    have = map_config_to_obj(module)

    commands = map_obj_to_commands((want, have), module)
    result["commands"] = commands

    if commands:
        if not module.check_mode:
            resp = load_config(module, commands, True)
            if resp:
                for item in resp:
                    if item:
                        if isinstance(item, dict):
                            err_str = item["clierror"]
                        else:
                            err_str = item
                        if "cannot add" in err_str.lower():
                            module.fail_json(msg=err_str)
        result["changed"] = True

    module.exit_json(**result)


if __name__ == "__main__":
    main()
