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

# (c) 2018, Simon Dodsley (simon@purestorage.com)
# 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': 'community'}

DOCUMENTATION = r'''
---
module: purefa_ntp
version_added: '1.0.0'
short_description: Configure Pure Storage FlashArray NTP settings
description:
- Set or erase NTP configuration for Pure Storage FlashArrays.
author:
- Pure Storage Ansible Team (@sdodsley) <pure-ansible-team@purestorage.com>
options:
  state:
    description:
    - Create or delete NTP servers configuration
    type: str
    default: present
    choices: [ absent, present ]
  ntp_servers:
    type: list
    elements: str
    description:
    - A list of up to 4 alternate NTP servers. These may include IPv4,
      IPv6 or FQDNs. Invalid IP addresses will cause the module to fail.
      No validation is performed for FQDNs.
    - If more than 4 servers are provided, only the first 4 unique
      nameservers will be used.
    - if no servers are given a default of I(0.pool.ntp.org) will be used.
extends_documentation_fragment:
- purestorage.flasharray.purestorage.fa
'''

EXAMPLES = r'''
- name: Delete exisitng NTP server entries
  purefa_ntp:
    state: absent
    fa_url: 10.10.10.2
    api_token: e31060a7-21fc-e277-6240-25983c6c4592

- name: Set array NTP servers
  purefa_ntp:
    state: present
    ntp_servers:
      - "0.pool.ntp.org"
      - "1.pool.ntp.org"
      - "2.pool.ntp.org"
      - "3.pool.ntp.org"
    fa_url: 10.10.10.2
    api_token: e31060a7-21fc-e277-6240-25983c6c4592
'''

RETURN = r'''
'''

from ansible.module_utils.basic import AnsibleModule
from ansible_collections.purestorage.flasharray.plugins.module_utils.purefa import get_system, purefa_argument_spec


def _is_cbs(array, is_cbs=False):
    """Is the selected array a Cloud Block Store"""
    model = array.get(controllers=True)[0]['model']
    is_cbs = bool('CBS' in model)
    return is_cbs


def remove(duplicate):
    final_list = []
    for num in duplicate:
        if num not in final_list:
            final_list.append(num)
    return final_list


def delete_ntp(module, array):
    """Delete NTP Servers"""
    changed = True
    if not module.check_mode:
        if array.get(ntpserver=True)['ntpserver'] != []:
            try:
                array.set(ntpserver=[])
            except Exception:
                module.fail_json(msg='Deletion of NTP servers failed')
    module.exit_json(changed=changed)


def create_ntp(module, array):
    """Set NTP Servers"""
    changed = True
    if not module.check_mode:
        if not module.params['ntp_servers']:
            module.params['ntp_servers'] = ['0.pool.ntp.org']
        try:
            array.set(ntpserver=module.params['ntp_servers'][0:4])
        except Exception:
            module.fail_json(msg='Update of NTP servers failed')
    module.exit_json(changed=changed)


def main():
    argument_spec = purefa_argument_spec()
    argument_spec.update(dict(
        ntp_servers=dict(type='list', elements='str'),
        state=dict(type='str', default='present', choices=['absent', 'present']),
    ))

    required_if = [['state', 'present', ['ntp_servers']]]

    module = AnsibleModule(argument_spec,
                           required_if=required_if,
                           supports_check_mode=True)

    array = get_system(module)
    if _is_cbs(array):
        module.warn('NTP settings are not necessary for a CBS array - ignoring...')
        module.exit_json(changed=False)

    if module.params['state'] == 'absent':
        delete_ntp(module, array)
    else:
        module.params['ntp_servers'] = remove(module.params['ntp_servers'])
        if sorted(array.get(ntpserver=True)['ntpserver']) != sorted(module.params['ntp_servers'][0:4]):
            create_ntp(module, array)

    module.exit_json(changed=False)


if __name__ == '__main__':
    main()
