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

# Copyright (C) 2017 Lenovo, Inc.
# (c) 2017, Ansible by Red Hat, inc
# 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/>.
#
# Module to send VLAN commands to Lenovo Switches
# Overloading aspect of vlan creation in a range is pending
# Lenovo Networking


from __future__ import absolute_import, division, print_function
__metaclass__ = type


DOCUMENTATION = '''
---
module: cnos_vlan
author: "Anil Kumar Mureleedharan(@amuraleedhar)"
short_description: Manage VLANs on CNOS network devices
description:
  - This module provides declarative management of VLANs
    on Lenovo CNOS network devices.
notes:
  - Tested against CNOS 10.8.1
options:
  name:
    description:
      - Name of the VLAN.
  vlan_id:
    description:
      - ID of the VLAN. Range 1-4094.
    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 interfaces on device it will result in failure.
  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', 'active', 'suspend']
'''

EXAMPLES = """
- name: Create vlan
  community.network.cnos_vlan:
    vlan_id: 100
    name: test-vlan
    state: present

- name: Add interfaces to VLAN
  community.network.cnos_vlan:
    vlan_id: 100
    interfaces:
      - Ethernet1/33
      - Ethernet1/44

- name: Check if interfaces is assigned to VLAN
  community.network.cnos_vlan:
    vlan_id: 100
    associated_interfaces:
      - Ethernet1/33
      - Ethernet1/44

- name: Delete vlan
  community.network.cnos_vlan:
    vlan_id: 100
    state: absent
"""

RETURN = """
commands:
  description: The list of configuration mode commands to send to the device
  returned: always
  type: list
  sample:
    - vlan 100
    - name test-vlan
"""

import re
import time

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.community.network.plugins.module_utils.network.cnos.cnos import load_config, run_commands
from ansible_collections.community.network.plugins.module_utils.network.cnos.cnos import debugOutput, check_args
from ansible_collections.community.network.plugins.module_utils.network.cnos.cnos import cnos_argument_spec
from ansible.module_utils._text import to_text


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


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']
        interfaces = w['interfaces']
        state = w['state']

        obj_in_have = search_obj_in_list(vlan_id, have)

        if state == 'absent':
            if obj_in_have:
                commands.append('no vlan {0}'.format(vlan_id))

        elif state == 'present':
            if not obj_in_have:
                commands.append('vlan {0}'.format(vlan_id))
                if name:
                    commands.append('name {0}'.format(name))

                if interfaces:
                    for i in interfaces:
                        commands.append('interface {0}'.format(i))
                        commands.append('switchport mode access')
                        commands.append('switchport access vlan {0}'.format(vlan_id))

            else:
                if name:
                    if name != obj_in_have['name']:
                        commands.append('vlan {0}'.format(vlan_id))
                        commands.append('name {0}'.format(name))

                if interfaces:
                    if not obj_in_have['interfaces']:
                        for i in interfaces:
                            commands.append('vlan {0}'.format(vlan_id))
                            commands.append('interface {0}'.format(i))
                            commands.append('switchport mode access')
                            commands.append('switchport access vlan {0}'.format(vlan_id))

                    elif set(interfaces) != set(obj_in_have['interfaces']):
                        missing_interfaces = list(set(interfaces) - set(obj_in_have['interfaces']))
                        for i in missing_interfaces:
                            commands.append('vlan {0}'.format(vlan_id))
                            commands.append('interface {0}'.format(i))
                            commands.append('switchport mode access')
                            commands.append('switchport access vlan {0}'.format(vlan_id))

                        superfluous_interfaces = list(set(obj_in_have['interfaces']) - set(interfaces))
                        for i in superfluous_interfaces:
                            commands.append('vlan {0}'.format(vlan_id))
                            commands.append('interface {0}'.format(i))
                            commands.append('switchport mode access')
                            commands.append('no switchport access vlan')
        else:
            commands.append('vlan {0}'.format(vlan_id))
            if name:
                commands.append('name {0}'.format(name))
            commands.append('state {0}'.format(state))

    if purge:
        for h in have:
            obj_in_want = search_obj_in_list(h['vlan_id'], want)
            if not obj_in_want and h['vlan_id'] != '1':
                commands.append('no vlan {0}'.format(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()
            d['vlan_id'] = str(d['vlan_id'])

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

    return obj


def parse_to_logical_rows(out):
    relevant_data = False
    cur_row = []
    for line in out.splitlines():
        if not line:
            """Skip empty lines."""
            continue
        if '0' < line[0] <= '9':
            """Line starting with a number."""
            if len(cur_row) > 0:
                yield cur_row
                cur_row = []  # Reset it to hold a next chunk
            relevant_data = True
        if relevant_data:
            data = line.strip().split('(')
            cur_row.append(data[0])
    yield cur_row


def parse_to_obj(logical_rows):
    first_row = logical_rows[0]
    rest_rows = logical_rows[1:]
    vlan_data = first_row.split()
    obj = {}
    obj['vlan_id'] = vlan_data[0]
    obj['name'] = vlan_data[1]
    obj['state'] = vlan_data[2]
    obj['interfaces'] = rest_rows
    return obj


def parse_vlan_brief(vlan_out):
    return [parse_to_obj(r) for r in parse_to_logical_rows(vlan_out)]


def map_config_to_obj(module):
    return parse_vlan_brief(run_commands(module, ['show vlan brief'])[0])


def check_declarative_intent_params(want, module, result):

    have = None
    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)

        for i in w['associated_interfaces']:
            obj_in_have = search_obj_in_list(w['vlan_id'], have)
            if obj_in_have and 'interfaces' in obj_in_have and i not in obj_in_have['interfaces']:
                module.fail_json(msg="Interface %s not configured on vlan %s" % (i, w['vlan_id']))


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

    aggregate_spec = deepcopy(element_spec)
    aggregate_spec['vlan_id'] = 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(cnos_argument_spec)

    required_one_of = [['vlan_id', 'aggregate']]
    mutually_exclusive = [['vlan_id', '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:
            load_config(module, commands)
        result['changed'] = True

    check_declarative_intent_params(want, module, result)

    module.exit_json(**result)


if __name__ == '__main__':
    main()