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

# Copyright: (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: eos_linkagg
author: Trishna Guha (@trishnaguha)
short_description: (deprecated, removed after 2022-06-01) Manage link aggregation
  groups on Arista EOS network devices
description:
- This module provides declarative management of link aggregation groups on Arista
  EOS network devices.
version_added: 1.0.0
deprecated:
  alternative: eos_lag_interfaces
  why: Updated modules released with more functionality
  removed_at_date: '2022-06-01'
notes:
- Tested against EOS 4.15
options:
  group:
    description:
    - Channel-group number for the port-channel Link aggregation group. Range 1-2000.
  mode:
    description:
    - Mode of the link aggregation group.
    choices:
    - active
    - on
    - passive
  members:
    description:
    - List of members of the link aggregation group.
  min_links:
    description:
    - Minimum number of ports required up before bringing up the link aggregation
      group.
  aggregate:
    description: List of link aggregation definitions.
  state:
    description:
    - State of the link aggregation group.
    default: present
    choices:
    - present
    - absent
  purge:
    description:
    - Purge links not defined in the I(aggregate) parameter.
    default: false
    type: bool
extends_documentation_fragment:
- arista.eos.eos

"""

EXAMPLES = """
- name: create link aggregation group
  arista.eos.eos_linkagg:
    group: 10
    state: present

- name: delete link aggregation group
  arista.eos.eos_linkagg:
    group: 10
    state: absent

- name: set link aggregation group to members
  arista.eos.eos_linkagg:
    group: 200
    min_links: 3
    mode: active
    members:
    - Ethernet0
    - Ethernet1

- name: remove link aggregation group from Ethernet0
  arista.eos.eos_linkagg:
    group: 200
    min_links: 3
    mode: active
    members:
    - Ethernet1

- name: Create aggregate of linkagg definitions
  arista.eos.eos_linkagg:
    aggregate:
    - {group: 3, mode: on, members: [Ethernet1]}
    - {group: 100, mode: passive, min_links: 3, members: [Ethernet2]}

- name: Remove aggregate of linkagg definitions
  arista.eos.eos_linkagg:
    aggregate:
    - {group: 3, mode: on, members: [Ethernet1]}
    - {group: 100, mode: passive, min_links: 3, members: [Ethernet2]}
    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
    - port-channel min-links 5
    - interface Ethernet3
    - channel-group 30 mode on
    - no interface port-channel 30
"""

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.arista.eos.plugins.module_utils.network.eos.eos import (
    get_config,
    load_config,
)
from ansible_collections.arista.eos.plugins.module_utils.network.eos.eos import (
    eos_argument_spec,
)


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


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

    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:
                commands.append("no interface port-channel {0}".format(group))

        elif state == "present":
            cmd = ["interface port-channel {0}".format(group), "end"]
            if not obj_in_have:
                if not group:
                    module.fail_json(msg="group is a required option")
                commands.extend(cmd)

                if min_links != "None":
                    commands.append(
                        "port-channel min-links {0}".format(min_links)
                    )

                if members:
                    for m in members:
                        commands.append("interface {0}".format(m))
                        commands.append(
                            "channel-group {0} mode {1}".format(group, mode)
                        )

            else:
                if members:
                    if "members" not in obj_in_have.keys():
                        for m in members:
                            commands.extend(cmd)
                            commands.append("interface {0}".format(m))
                            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.extend(cmd)
                            commands.append("interface {0}".format(m))
                            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.extend(cmd)
                            commands.append("interface {0}".format(m))
                            commands.append(
                                "no channel-group {0}".format(group)
                            )

    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, required_together=None):
    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]

            module._check_required_together(required_together, item)
            d = item.copy()
            d["group"] = str(d["group"])
            d["min_links"] = str(d["min_links"])

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

    return obj


def parse_mode(group, member, config):
    mode = None

    for line in config.strip().split("!"):
        match_int = re.findall(r"interface {0}\\b".format(member), line, re.M)
        if match_int:
            match = re.search(
                r"channel-group {0} mode (\S+)".format(group), line, re.M
            )
            if match:
                mode = match.group(1)

    return mode


def parse_members(group, config):
    members = []

    for line in config.strip().split("!"):
        match_group = re.findall(
            r"channel-group {0} mode".format(group), line, re.M
        )
        if match_group:
            match = re.search(r"interface (\S+)", line, re.M)
            if match:
                members.append(match.group(1))

    return members


def get_channel(group, module):
    channel = {}
    config = get_config(module, flags=["| section channel-group"])

    for line in config.split("\n"):
        stripped = line.strip()
        match = re.search(r"interface (\S+)", stripped, re.M)

        if match:
            member = match.group(1)
            channel["mode"] = parse_mode(group, member, config)
            channel["members"] = parse_members(group, config)

    return channel


def parse_min_links(group, config):
    min_links = ""

    for line in config.strip().split("!"):
        match_pc = re.findall(
            r"interface Port-Channel{0}\\b".format(group), line, re.M
        )
        if match_pc:
            match = re.search(r"port-channel min-links (\S+)", line, re.M)
            if match:
                min_links = match.group(1)

    return min_links


def map_config_to_obj(module):
    objs = list()
    config = get_config(module, flags=["| section port-channel"])

    for line in config.split("\n"):
        stripped = line.strip()
        match = re.search(r"interface Port-Channel(\S+)", stripped, re.M)
        if match:
            obj = {}
            group = match.group(1)
            obj["group"] = group
            obj["min_links"] = parse_min_links(group, config)
            obj.update(get_channel(group, module))
            objs.append(obj)

    return objs


def main():
    """ main entry point for module execution
    """
    element_spec = dict(
        group=dict(type="int"),
        mode=dict(choices=["active", "on", "passive"]),
        min_links=dict(type="int"),
        members=dict(type="list"),
        state=dict(default="present", choices=["present", "absent"]),
    )

    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(eos_argument_spec)

    required_one_of = [["group", "aggregate"]]
    required_together = [["members", "mode"]]
    mutually_exclusive = [["group", "aggregate"]]
    module = AnsibleModule(
        argument_spec=argument_spec,
        required_one_of=required_one_of,
        required_together=required_together,
        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:
        commit = not module.check_mode
        response = load_config(module, commands, commit=commit)
        if response.get("diff") and module._diff:
            result["diff"] = {"prepared": response.get("diff")}
        result["session_name"] = response.get("session")
        result["changed"] = True

    module.exit_json(**result)


if __name__ == "__main__":
    main()
