#!/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


ANSIBLE_METADATA = {
    "metadata_version": "1.1",
    "status": ["preview"],
    "supported_by": "network",
}

DOCUMENTATION = """
---
module: vyos_vlan
version_added: "2.5"
author: "Trishna Guha (@trishnaguha)"
short_description: Manage VLANs on VyOS network devices
description:
  - This module provides declarative management of VLANs
    on VyOS network devices.
notes:
  - Tested against VYOS 1.1.7
options:
  name:
    description:
      - Name of the VLAN.
  address:
    description:
      - Configure Virtual interface address.
  vlan_id:
    description:
      - ID of the VLAN. Range 0-4094.
    required: true
  interfaces:
    description:
      - List of interfaces that should be associated to the VLAN.
    required: true
  associated_interfaces:
    description:
      - This is a intent option and checks the operational state of the for given vlan C(name)
        for associated interfaces. If the value in the C(associated_interfaces) does not match with
        the operational state of vlan on device it will result in failure.
    version_added: "2.5"
  delay:
    description:
      - Delay the play should wait to check for declarative intent params values.
    default: 10
  aggregate:
    description: List of VLANs definitions.
  purge:
    description:
      - Purge VLANs not defined in the I(aggregate) parameter.
    default: no
    type: bool
  state:
    description:
      - State of the VLAN configuration.
    default: present
    choices: ['present', 'absent']
extends_documentation_fragment: vyos
"""

EXAMPLES = """
- name: Create vlan
  vyos_vlan:
    vlan_id: 100
    name: vlan-100
    interfaces: eth1
    state: present

- name: Add interfaces to VLAN
  vyos_vlan:
    vlan_id: 100
    interfaces:
      - eth1
      - eth2

- name: Configure virtual interface address
  vyos_vlan:
    vlan_id: 100
    interfaces: eth1
    address: 172.26.100.37/24

- name: vlan interface config + intent
  vyos_vlan:
    vlan_id: 100
    interfaces: eth0
    associated_interfaces:
    - eth0

- name: vlan intent check
  vyos_vlan:
    vlan_id: 100
    associated_interfaces:
    - eth3
    - eth4

- name: Delete vlan
  vyos_vlan:
    vlan_id: 100
    interfaces: eth1
    state: absent
"""

RETURN = """
commands:
  description: The list of configuration mode commands to send to the device
  returned: always
  type: list
  sample:
    - set interfaces ethernet eth1 vif 100 description VLAN 100
    - set interfaces ethernet eth1 vif 100 address 172.26.100.37/24
    - delete interfaces ethernet eth1 vif 100
"""
import re
import time

from copy import deepcopy

from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.network.common.utils import remove_default_spec
from ansible_collections.vyos.vyos.plugins.module_utils.network.vyos.vyos import (
    load_config,
    run_commands,
)

from ansible_collections.vyos.vyos.plugins.module_utils.network.vyos.vyos import (
    vyos_argument_spec,
)


def search_obj_in_list(vlan_id, lst):
    obj = list()
    for o in lst:
        if o["vlan_id"] == vlan_id:
            obj.append(o)
    return obj


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

    for w in want:
        vlan_id = w["vlan_id"]
        name = w["name"]
        address = w["address"]
        state = w["state"]
        interfaces = w["interfaces"]

        obj_in_have = search_obj_in_list(vlan_id, have)

        if state == "absent":
            if obj_in_have:
                for obj in obj_in_have:
                    for i in obj["interfaces"]:
                        commands.append(
                            "delete interfaces ethernet {0} vif {1}".format(i, vlan_id)
                        )

        elif state == "present":
            if not obj_in_have:
                if w["interfaces"] and w["vlan_id"]:
                    for i in w["interfaces"]:
                        cmd = "set interfaces ethernet {0} vif {1}".format(i, vlan_id)
                        if w["name"]:
                            commands.append(cmd + " description {0}".format(name))
                        elif w["address"]:
                            commands.append(cmd + " address {0}".format(address))
                        else:
                            commands.append(cmd)

    if purge:
        for h in have:
            obj_in_want = search_obj_in_list(h["vlan_id"], want)
            if not obj_in_want:
                for i in h["interfaces"]:
                    commands.append(
                        "delete interfaces ethernet {0} vif {1}".format(i, h["vlan_id"])
                    )

    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()

            if not d["vlan_id"]:
                module.fail_json(msg="vlan_id is required")

            d["vlan_id"] = str(d["vlan_id"])
            module._check_required_one_of(module.required_one_of, item)

            obj.append(d)
    else:
        obj.append(
            {
                "vlan_id": str(module.params["vlan_id"]),
                "name": module.params["name"],
                "address": module.params["address"],
                "state": module.params["state"],
                "interfaces": module.params["interfaces"],
                "associated_interfaces": module.params["associated_interfaces"],
            }
        )

    return obj


def map_config_to_obj(module):
    objs = []
    interfaces = list()

    output = run_commands(module, "show interfaces")
    lines = output[0].strip().splitlines()[3:]

    for l in lines:
        splitted_line = re.split(r"\s{2,}", l.strip())
        obj = {}

        eth = splitted_line[0].strip("'")
        if eth.startswith("eth"):
            obj["interfaces"] = []
            if "." in eth:
                interface = eth.split(".")[0]
                obj["interfaces"].append(interface)
                obj["vlan_id"] = eth.split(".")[-1]
            else:
                obj["interfaces"].append(eth)
                obj["vlan_id"] = None

            if splitted_line[1].strip("'") != "-":
                obj["address"] = splitted_line[1].strip("'")

            if len(splitted_line) > 3:
                obj["name"] = splitted_line[3].strip("'")
            obj["state"] = "present"
            objs.append(obj)

    return objs


def check_declarative_intent_params(want, module, result):

    have = None
    obj_interface = list()
    is_delay = False

    for w in want:
        if w.get("associated_interfaces") is None:
            continue

        if result["changed"] and not is_delay:
            time.sleep(module.params["delay"])
            is_delay = True

        if have is None:
            have = map_config_to_obj(module)

        obj_in_have = search_obj_in_list(w["vlan_id"], have)
        if obj_in_have:
            for obj in obj_in_have:
                obj_interface.extend(obj["interfaces"])

    for w in want:
        if w.get("associated_interfaces") is None:
            continue
        for i in w["associated_interfaces"]:
            if (set(obj_interface) - set(w["associated_interfaces"])) != set([]):
                module.fail_json(
                    msg="Interface {0} not configured on vlan {1}".format(
                        i, w["vlan_id"]
                    )
                )


def main():
    """ main entry point for module execution
    """
    element_spec = dict(
        vlan_id=dict(type="int"),
        name=dict(),
        address=dict(),
        interfaces=dict(type="list"),
        associated_interfaces=dict(type="list"),
        delay=dict(default=10, type="int"),
        state=dict(default="present", choices=["present", "absent"]),
    )

    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),
        purge=dict(default=False, type="bool"),
    )

    argument_spec.update(element_spec)
    argument_spec.update(vyos_argument_spec)

    required_one_of = [
        ["vlan_id", "aggregate"],
        ["aggregate", "interfaces", "associated_interfaces"],
    ]

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

    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
        load_config(module, commands, commit=commit)
        result["changed"] = True

    check_declarative_intent_params(want, module, result)

    module.exit_json(**result)


if __name__ == "__main__":
    main()