#!/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_l2_interface
extends_documentation_fragment:
- cisco.nxos.nxos
short_description: (deprecated, removed after 2022-06-01) Manage Layer-2
  interface on Cisco NXOS devices.
description:
- This module provides declarative management of Layer-2 interface on Cisco NXOS devices.
version_added: 1.0.0
deprecated:
  alternative: nxos_l2_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).
options:
  name:
    description:
    - Full name of the interface excluding any logical unit number, i.e. Ethernet1/1.
    required: true
    aliases:
    - interface
  mode:
    description:
    - Mode in which interface needs to be configured.
    choices:
    - access
    - trunk
  access_vlan:
    description:
    - Configure given VLAN in access port. If C(mode=access), used as the access VLAN
      ID.
  native_vlan:
    description:
    - Native VLAN to be configured in trunk port. If C(mode=trunk), used as the trunk
      native VLAN ID.
  trunk_vlans:
    description:
    - List of VLANs to be configured in trunk port. If C(mode=trunk), used as the
      VLAN range to ADD or REMOVE from the trunk.
    aliases:
    - trunk_add_vlans
  trunk_allowed_vlans:
    description:
    - List of allowed VLANs in a given trunk port. If C(mode=trunk), these are the
      only VLANs that will be configured on the trunk, i.e. "2-10,15".
  aggregate:
    description:
    - List of Layer-2 interface definitions.
  state:
    description:
    - Manage the state of the Layer-2 Interface configuration.
    default: present
    choices:
    - present
    - absent
    - unconfigured


"""

EXAMPLES = """
- name: Ensure Eth1/5 is in its default l2 interface state
  cisco.nxos.nxos_l2_interface:
    name: Ethernet1/5
    state: unconfigured

- name: Ensure Eth1/5 is configured for access vlan 20
  cisco.nxos.nxos_l2_interface:
    name: Ethernet1/5
    mode: access
    access_vlan: 20

- name: Ensure Eth1/5 only has vlans 5-10 as trunk vlans
  cisco.nxos.nxos_l2_interface:
    name: Ethernet1/5
    mode: trunk
    native_vlan: 10
    trunk_vlans: 5-10

- name: Ensure eth1/5 is a trunk port and ensure 2-50 are being tagged (doesn't mean
    others aren't also being tagged)
  cisco.nxos.nxos_l2_interface:
    name: Ethernet1/5
    mode: trunk
    native_vlan: 10
    trunk_vlans: 2-50

- name: Ensure these VLANs are not being tagged on the trunk
  cisco.nxos.nxos_l2_interface:
    name: Ethernet1/5
    mode: trunk
    trunk_vlans: 51-4094
    state: absent

- name: Aggregate Configure interfaces for access_vlan with aggregate
  cisco.nxos.nxos_l2_interface:
    aggregate:
    - {name: Ethernet1/2, access_vlan: 6}
    - {name: Ethernet1/7, access_vlan: 15}
    mode: access
"""

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 eth1/5
    - switchport access vlan 20
"""

from copy import deepcopy

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


def get_interface_mode(name, module):
    """Gets current mode of interface: layer2 or layer3
    Args:
        device (Device): This is the device object of an NX-API enabled device
            using the Device class within device.py
        interface (string): full name of interface, i.e. Ethernet1/1,
            loopback10, port-channel20, vlan20
    Returns:
        str: 'layer2' or 'layer3'
    """
    command = "show interface {0} | json".format(name)
    intf_type = get_interface_type(name)
    mode = "unknown"
    interface_table = {}

    try:
        body = run_commands(module, [command])[0]
        interface_table = body["TABLE_interface"]["ROW_interface"]
    except (KeyError, AttributeError, IndexError):
        return mode

    if interface_table:
        # HACK FOR NOW
        if intf_type in ["ethernet", "portchannel"]:
            mode = str(interface_table.get("eth_mode", "layer3"))
            if mode in ["access", "trunk"]:
                mode = "layer2"
            if mode == "routed":
                mode = "layer3"
        elif intf_type == "loopback" or intf_type == "svi":
            mode = "layer3"
    return mode


def interface_is_portchannel(name, module):
    """Checks to see if an interface is part of portchannel bundle
    Args:
        interface (str): full name of interface, i.e. Ethernet1/1
    Returns:
        True/False based on if interface is a member of a portchannel bundle
    """
    intf_type = get_interface_type(name)

    if intf_type == "ethernet":
        command = "show interface {0} | json".format(name)
        try:
            body = run_commands(module, [command])[0]
            interface_table = body["TABLE_interface"]["ROW_interface"]
        except (KeyError, AttributeError, IndexError):
            interface_table = None

        if interface_table:
            state = interface_table.get("eth_bundle")
            if state:
                return True
            else:
                return False

    return False


def get_switchport(port, module):
    """Gets current config of L2 switchport
    Args:
        device (Device): This is the device object of an NX-API enabled device
            using the Device class within device.py
        port (str): full name of interface, i.e. Ethernet1/1
    Returns:
        dictionary with k/v pairs for L2 vlan config
    """

    command = "show interface {0} switchport | json".format(port)

    try:
        body = run_commands(module, [command])[0]
        sp_table = body["TABLE_interface"]["ROW_interface"]
    except (KeyError, AttributeError, IndexError):
        sp_table = None

    if sp_table:
        key_map = {
            "interface": "name",
            "oper_mode": "mode",
            "switchport": "switchport",
            "access_vlan": "access_vlan",
            "access_vlan_name": "access_vlan_name",
            "native_vlan": "native_vlan",
            "native_vlan_name": "native_vlan_name",
            "trunk_vlans": "trunk_vlans",
        }
        sp = apply_key_map(key_map, sp_table)
        return sp

    else:
        return {}


def remove_switchport_config_commands(name, existing, proposed, module):
    mode = proposed.get("mode")
    commands = []
    command = None

    if mode == "access":
        av_check = existing.get("access_vlan") == proposed.get("access_vlan")
        if av_check:
            command = "no switchport access vlan {0}".format(
                existing.get("access_vlan")
            )
            commands.append(command)

    elif mode == "trunk":
        existing_vlans = existing.get("trunk_vlans_list")
        proposed_vlans = proposed.get("trunk_vlans_list")
        vlans_to_remove = set(proposed_vlans).intersection(existing_vlans)

        if vlans_to_remove:
            proposed_allowed_vlans = proposed.get("trunk_allowed_vlans")
            remove_trunk_allowed_vlans = proposed.get(
                "trunk_vlans", proposed_allowed_vlans
            )
            command = "switchport trunk allowed vlan remove {0}".format(
                remove_trunk_allowed_vlans
            )
            commands.append(command)

        native_check = existing.get("native_vlan") == proposed.get(
            "native_vlan"
        )
        if native_check and proposed.get("native_vlan"):
            command = "no switchport trunk native vlan {0}".format(
                existing.get("native_vlan")
            )
            commands.append(command)

    if commands:
        commands.insert(0, "interface " + name)
    return commands


def get_switchport_config_commands(name, existing, proposed, module):
    """Gets commands required to config a given switchport interface
    """

    proposed_mode = proposed.get("mode")
    existing_mode = existing.get("mode")
    commands = []
    command = None

    if proposed_mode != existing_mode:
        if proposed_mode == "trunk":
            command = "switchport mode trunk"
        elif proposed_mode == "access":
            command = "switchport mode access"

    if command:
        commands.append(command)

    if proposed_mode == "access":
        av_check = str(existing.get("access_vlan")) == str(
            proposed.get("access_vlan")
        )
        if not av_check:
            command = "switchport access vlan {0}".format(
                proposed.get("access_vlan")
            )
            commands.append(command)

    elif proposed_mode == "trunk":
        tv_check = existing.get("trunk_vlans_list") == proposed.get(
            "trunk_vlans_list"
        )

        if not tv_check:
            if proposed.get("allowed"):
                command = "switchport trunk allowed vlan {0}".format(
                    proposed.get("trunk_allowed_vlans")
                )
                commands.append(command)

            else:
                existing_vlans = existing.get("trunk_vlans_list")
                proposed_vlans = proposed.get("trunk_vlans_list")
                vlans_to_add = set(proposed_vlans).difference(existing_vlans)
                if vlans_to_add:
                    command = "switchport trunk allowed vlan add {0}".format(
                        proposed.get("trunk_vlans")
                    )
                    commands.append(command)

        native_check = str(existing.get("native_vlan")) == str(
            proposed.get("native_vlan")
        )
        if not native_check and proposed.get("native_vlan"):
            command = "switchport trunk native vlan {0}".format(
                proposed.get("native_vlan")
            )
            commands.append(command)

    if commands:
        commands.insert(0, "interface " + name)
    return commands


def is_switchport_default(existing):
    """Determines if switchport has a default config based on mode
    Args:
        existing (dict): existing switchport configuration from Ansible mod
    Returns:
        boolean: True if switchport has OOB Layer 2 config, i.e.
           vlan 1 and trunk all and mode is access
    """

    c1 = str(existing["access_vlan"]) == "1"
    c2 = str(existing["native_vlan"]) == "1"
    c3 = existing["trunk_vlans"] == "1-4094"
    c4 = existing["mode"] == "access"

    default = c1 and c2 and c3 and c4

    return default


def default_switchport_config(name):
    commands = []
    commands.append("interface " + name)
    commands.append("switchport mode access")
    commands.append("switch access vlan 1")
    commands.append("switchport trunk native vlan 1")
    commands.append("switchport trunk allowed vlan all")
    return commands


def vlan_range_to_list(vlans):
    result = []
    if vlans:
        for part in vlans.split(","):
            if part == "none":
                break
            if "-" in part:
                a, b = part.split("-")
                a, b = int(a), int(b)
                result.extend(range(a, b + 1))
            else:
                a = int(part)
                result.append(a)
        return numerical_sort(result)
    return result


def get_list_of_vlans(module):

    command = "show vlan | json"
    vlan_list = []

    try:
        body = run_commands(module, [command])[0]
        vlan_table = body["TABLE_vlanbrief"]["ROW_vlanbrief"]
    except (KeyError, AttributeError, IndexError):
        return []

    if isinstance(vlan_table, list):
        for vlan in vlan_table:
            vlan_list.append(str(vlan["vlanshowbr-vlanid-utf"]))
    else:
        vlan_list.append("1")

    return vlan_list


def numerical_sort(string_int_list):
    """Sorts list of strings/integers that are digits in numerical order.
    """

    as_int_list = []
    as_str_list = []
    for vlan in string_int_list:
        as_int_list.append(int(vlan))
    as_int_list.sort()
    for vlan in as_int_list:
        as_str_list.append(str(vlan))
    return as_str_list


def apply_key_map(key_map, table):
    new_dict = {}
    for key, value in table.items():
        new_key = key_map.get(key)
        if new_key:
            new_dict[new_key] = str(value)
    return new_dict


def apply_value_map(value_map, resource):
    for key, value in value_map.items():
        resource[key] = value[resource.get(key)]
    return resource


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 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()
            obj.append(d)
    else:
        obj.append(
            {
                "name": module.params["name"],
                "mode": module.params["mode"],
                "access_vlan": module.params["access_vlan"],
                "native_vlan": module.params["native_vlan"],
                "trunk_vlans": module.params["trunk_vlans"],
                "trunk_allowed_vlans": module.params["trunk_allowed_vlans"],
                "state": module.params["state"],
            }
        )

    return obj


def main():
    """ main entry point for module execution
    """
    element_spec = dict(
        name=dict(type="str", aliases=["interface"]),
        mode=dict(choices=["access", "trunk"]),
        access_vlan=dict(type="str"),
        native_vlan=dict(type="str"),
        trunk_vlans=dict(type="str", aliases=["trunk_add_vlans"]),
        trunk_allowed_vlans=dict(type="str"),
        state=dict(
            choices=["absent", "present", "unconfigured"], default="present"
        ),
    )

    aggregate_spec = deepcopy(element_spec)

    # 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)
    )

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

    module = AnsibleModule(
        argument_spec=argument_spec,
        mutually_exclusive=[
            ["access_vlan", "trunk_vlans"],
            ["access_vlan", "native_vlan"],
            ["access_vlan", "trunk_allowed_vlans"],
        ],
        supports_check_mode=True,
    )

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

    want = map_params_to_obj(module)
    for w in want:
        name = w["name"]
        mode = w["mode"]
        access_vlan = w["access_vlan"]
        state = w["state"]
        trunk_vlans = w["trunk_vlans"]
        native_vlan = w["native_vlan"]
        trunk_allowed_vlans = w["trunk_allowed_vlans"]

        args = dict(
            name=name,
            mode=mode,
            access_vlan=access_vlan,
            native_vlan=native_vlan,
            trunk_vlans=trunk_vlans,
            trunk_allowed_vlans=trunk_allowed_vlans,
        )

        proposed = dict((k, v) for k, v in args.items() if v is not None)

        name = name.lower()

        if mode == "access" and state == "present" and not access_vlan:
            module.fail_json(
                msg="access_vlan param is required when mode=access && state=present"
            )

        if mode == "trunk" and access_vlan:
            module.fail_json(
                msg="access_vlan param not supported when using mode=trunk"
            )

        current_mode = get_interface_mode(name, module)

        # Current mode will return layer3, layer2, or unknown
        if current_mode == "unknown" or current_mode == "layer3":
            module.fail_json(
                msg="Ensure interface is configured to be a L2"
                "\nport first before using this module. You can use"
                "\nthe nxos_interface module for this."
            )

        if interface_is_portchannel(name, module):
            module.fail_json(
                msg="Cannot change L2 config on physical "
                "\nport because it is in a portchannel. "
                "\nYou should update the portchannel config."
            )

        # existing will never be null for Eth intfs as there is always a default
        existing = get_switchport(name, module)

        # Safeguard check
        # If there isn't an existing, something is wrong per previous comment
        if not existing:
            module.fail_json(
                msg="Make sure you are using the FULL interface name"
            )

        if trunk_vlans or trunk_allowed_vlans:
            if trunk_vlans:
                trunk_vlans_list = vlan_range_to_list(trunk_vlans)
            elif trunk_allowed_vlans:
                trunk_vlans_list = vlan_range_to_list(trunk_allowed_vlans)
                proposed["allowed"] = True

            existing_trunks_list = vlan_range_to_list(
                (existing["trunk_vlans"])
            )

            existing["trunk_vlans_list"] = existing_trunks_list
            proposed["trunk_vlans_list"] = trunk_vlans_list

        current_vlans = get_list_of_vlans(module)

        if state == "present":
            if access_vlan and access_vlan not in current_vlans:
                module.fail_json(
                    msg="You are trying to configure a VLAN"
                    " on an interface that\ndoes not exist on the "
                    " switch yet!",
                    vlan=access_vlan,
                )
            elif native_vlan and native_vlan not in current_vlans:
                module.fail_json(
                    msg="You are trying to configure a VLAN"
                    " on an interface that\ndoes not exist on the "
                    " switch yet!",
                    vlan=native_vlan,
                )
            else:
                command = get_switchport_config_commands(
                    name, existing, proposed, module
                )
                commands.append(command)
        elif state == "unconfigured":
            is_default = is_switchport_default(existing)
            if not is_default:
                command = default_switchport_config(name)
                commands.append(command)
        elif state == "absent":
            command = remove_switchport_config_commands(
                name, existing, proposed, module
            )
            commands.append(command)

        if trunk_vlans or trunk_allowed_vlans:
            existing.pop("trunk_vlans_list")
            proposed.pop("trunk_vlans_list")

    cmds = flatten_list(commands)
    if cmds:
        if module.check_mode:
            module.exit_json(changed=True, commands=cmds)
        else:
            result["changed"] = True
            load_config(module, cmds)
            if "configure" in cmds:
                cmds.pop(0)

    result["commands"] = cmds
    result["warnings"] = warnings

    module.exit_json(**result)


if __name__ == "__main__":
    main()
