#!/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_dns
version_added: '1.0.0'
short_description: Configure FlashArray DNS settings
description:
- Set or erase configuration for the DNS settings.
- Nameservers provided will overwrite any existing nameservers.
author:
- Pure Storage Ansible Team (@sdodsley) <pure-ansible-team@purestorage.com>
options:
  state:
    description:
    - Set or delete directory service configuration
    default: present
    type: str
    choices: [ absent, present ]
  domain:
    description:
    - Domain suffix to be appended when perofrming DNS lookups.
    type: str
  nameservers:
    description:
    - List of up to 3 unique DNS server IP addresses. These can be
      IPv4 or IPv6 - No validation is done of the addresses is performed.
    type: list
    elements: str
extends_documentation_fragment:
- purestorage.flasharray.purestorage.fa
"""

EXAMPLES = r"""
- name: Delete exisitng DNS settings
  purestorage.flasharray.purefa_dns:
    state: absent
    fa_url: 10.10.10.2
    api_token: e31060a7-21fc-e277-6240-25983c6c4592

- name: Set DNS settings
  purestorage.flasharray.purefa_dns:
    domain: purestorage.com
    nameservers:
      - 8.8.8.8
      - 8.8.4.4
    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 remove(duplicate):
    final_list = []
    for num in duplicate:
        if num not in final_list:
            final_list.append(num)
    return final_list


def delete_dns(module, array):
    """Delete DNS settings"""
    changed = False
    current_dns = array.get_dns()
    if current_dns["domain"] == "" and current_dns["nameservers"] == [""]:
        module.exit_json(changed=changed)
    else:
        try:
            changed = True
            if not module.check_mode:
                array.set_dns(domain="", nameservers=[])
        except Exception:
            module.fail_json(msg="Delete DNS settigs failed")
    module.exit_json(changed=changed)


def create_dns(module, array):
    """Set DNS settings"""
    changed = False
    current_dns = array.get_dns()
    if current_dns["domain"] != module.params["domain"] or sorted(
        module.params["nameservers"]
    ) != sorted(current_dns["nameservers"]):
        try:
            changed = True
            if not module.check_mode:
                array.set_dns(
                    domain=module.params["domain"],
                    nameservers=module.params["nameservers"][0:3],
                )
        except Exception:
            module.fail_json(msg="Set DNS settings failed: Check configuration")
    module.exit_json(changed=changed)


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

    required_if = [("state", "present", ["domain", "nameservers"])]

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

    state = module.params["state"]
    array = get_system(module)

    if state == "absent":
        delete_dns(module, array)
    elif state == "present":
        module.params["nameservers"] = remove(module.params["nameservers"])
        create_dns(module, array)
    else:
        module.exit_json(changed=False)


if __name__ == "__main__":
    main()