#!/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/>.
#
from __future__ import absolute_import, division, print_function

__metaclass__ = type
DOCUMENTATION = """
module: ios_l2_interface
extends_documentation_fragment:
- cisco.ios.ios
short_description: (deprecated, removed after 2022-06-01) Manage Layer-2 interface
  on Cisco IOS devices.
description:
- This module provides declarative management of Layer-2 interfaces on Cisco IOS devices.
version_added: 1.0.0
deprecated:
  alternative: ios_l2_interfaces
  why: Newer and updated modules released with more functionality in Ansible 2.9
  removed_at_date: '2022-06-01'
author:
- Nathaniel Case (@Qalthos)
options:
  name:
    description:
    - Full name of the interface excluding any logical unit number, i.e. GigabitEthernet0/1.
    required: true
    aliases:
    - interface
  mode:
    description:
    - Mode in which interface needs to be configured.
    default: access
    choices:
    - access
    - trunk
  access_vlan:
    description:
    - Configure given VLAN in access port. If C(mode=access), used as the access 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.
  native_vlan:
    description:
    - Native VLAN to be configured in trunk port. If C(mode=trunk), used as the trunk
      native VLAN ID.
  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 GigabitEthernet0/5 is in its default l2 interface state
  ios.ios_l2_interface:
    name: GigabitEthernet0/5
    state: unconfigured
- name: Ensure GigabitEthernet0/5 is configured for access vlan 20
  ios.ios_l2_interface:
    name: GigabitEthernet0/5
    mode: access
    access_vlan: 20
- name: Ensure GigabitEthernet0/5 only has vlans 5-10 as trunk vlans
  ios.ios_l2_interface:
    name: GigabitEthernet0/5
    mode: trunk
    native_vlan: 10
    trunk_allowed_vlans: 5-10
- name: Ensure GigabitEthernet0/5 is a trunk port and ensure 2-50 are being tagged
    (doesn't mean others aren't also being tagged)
  ios.ios_l2_interface:
    name: GigabitEthernet0/5
    mode: trunk
    native_vlan: 10
    trunk_vlans: 2-50
- name: Ensure these VLANs are not being tagged on the trunk
  ios.ios_l2_interface:
    name: GigabitEthernet0/5
    mode: trunk
    trunk_vlans: 51-4094
    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 GigabitEthernet0/5
    - switchport access vlan 20
"""
import re
from copy import deepcopy
from ansible.module_utils.basic import AnsibleModule
from ansible_collections.ansible.netcommon.plugins.module_utils.network.common.utils import (
    remove_default_spec,
)
from ansible_collections.cisco.ios.plugins.module_utils.network.ios.ios import (
    load_config,
    run_commands,
)
from ansible_collections.cisco.ios.plugins.module_utils.network.ios.ios import (
    ios_argument_spec,
)


def get_interface_type(interface):
    intf_type = "unknown"
    if interface.upper()[:2] in (
        "ET",
        "GI",
        "FA",
        "TE",
        "FO",
        "HU",
        "TWE",
        "TW",
    ):
        intf_type = "ethernet"
    elif interface.upper().startswith("VL"):
        intf_type = "svi"
    elif interface.upper().startswith("LO"):
        intf_type = "loopback"
    elif interface.upper()[:2] in ("MG", "MA"):
        intf_type = "management"
    elif interface.upper().startswith("PO"):
        intf_type = "portchannel"
    elif interface.upper().startswith("NV"):
        intf_type = "nve"
    return intf_type


def is_switchport(name, module):
    intf_type = get_interface_type(name)
    if intf_type in ("ethernet", "portchannel"):
        config = run_commands(
            module, ["show interface {0} switchport".format(name)]
        )[0]
        match = re.search("Switchport: Enabled", config)
        return bool(match)
    return False


def interface_is_portchannel(name, module):
    if get_interface_type(name) == "ethernet":
        config = run_commands(module, ["show run interface {0}".format(name)])[
            0
        ]
        if any(c in config for c in ["channel group", "channel-group"]):
            return True
    return False


def get_switchport(name, module):
    config = run_commands(
        module, ["show interface {0} switchport".format(name)]
    )[0]
    mode = re.search("Administrative Mode: (?:.* )?(\\w+)$", config, re.M)
    access = re.search("Access Mode VLAN: (\\d+)", config)
    native = re.search("Trunking Native Mode VLAN: (\\d+)", config)
    trunk = re.search("Trunking VLANs Enabled: (.+)$", config, re.M)
    if mode:
        mode = mode.group(1)
    if access:
        access = access.group(1)
    if native:
        native = native.group(1)
    if trunk:
        trunk = trunk.group(1)
    if trunk == "ALL":
        trunk = "1-4094"
    switchport_config = {
        "interface": name,
        "mode": mode,
        "access_vlan": access,
        "native_vlan": native,
        "trunk_vlans": trunk,
    }
    return switchport_config


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":
        # Supported Remove Scenarios for trunk_vlans_list
        # 1) Existing: 1,2,3 Proposed: 1,2,3 - Remove all
        # 2) Existing: 1,2,3 Proposed: 1,2   - Remove 1,2 Leave 3
        # 3) Existing: 1,2,3 Proposed: 2,3   - Remove 2,3 Leave 1
        # 4) Existing: 1,2,3 Proposed: 4,5,6 - None removed.
        # 5) Existing: None  Proposed: 1,2,3 - None removed.
        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.lower() == "none":
                break
            if part:
                if "-" in part:
                    start, stop = (int(i) for i in part.split("-"))
                    result.extend(range(start, stop + 1))
                else:
                    result.append(int(part))
    return sorted(result)


def get_list_of_vlans(module):
    config = run_commands(module, ["show vlan"])[0]
    vlans = set()
    lines = config.strip().splitlines()
    for line in lines:
        line_parts = line.split()
        if line_parts:
            try:
                int(line_parts[0])
            except ValueError:
                continue
            vlans.add(line_parts[0])
    return list(vlans)


def flatten_list(commands):
    flat_list = []
    for command in commands:
        if isinstance(command, list):
            flat_list.extend(command)
        else:
            flat_list.append(command)
    return flat_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]
            obj.append(item.copy())
    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"),
        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(ios_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, "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"
            )
        if not is_switchport(name, module):
            module.fail_json(
                msg="""Ensure interface is configured to be a L2
port first before using this module. You can use
the ios_interface module for this."""
            )
        if interface_is_portchannel(name, module):
            module.fail_json(
                msg="""Cannot change L2 config on physical
port because it is in a portchannel.
You 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
does 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
does 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
    module.exit_json(**result)


if __name__ == "__main__":
    main()
