#!/usr/bin/python
# -*- coding: utf-8 -*-
# Copyright: (c) 2018, Abhijeet Kasurde <akasurde@redhat.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: vmware_host_dns_facts
short_description: Gathers facts about an ESXi host's DNS configuration information
description:
- This module can be used to gather facts about an ESXi host's DNS configuration information when ESXi hostname or Cluster name is given.
- All parameters and VMware object names are case sensitive.
version_added: '2.5'
author:
- Abhijeet Kasurde (@akasurde)
notes:
- Tested on vSphere 6.5
requirements:
- python >= 2.6
- PyVmomi
options:
  cluster_name:
    description:
    - Name of the cluster from which the ESXi host belong to.
    - If C(esxi_hostname) is not given, this parameter is required.
  esxi_hostname:
    description:
    - ESXi hostname to gather facts from.
    - If C(cluster_name) is not given, this parameter is required.
extends_documentation_fragment: vmware.documentation
'''

EXAMPLES = r'''
- name: Gather DNS facts about all ESXi Host in given Cluster
  vmware_host_dns_facts:
    hostname: '{{ vcenter_hostname }}'
    username: '{{ vcenter_username }}'
    password: '{{ vcenter_password }}'
    cluster_name: cluster_name

- name: Gather DNS facts about ESXi Host
  vmware_host_dns_facts:
    hostname: '{{ vcenter_hostname }}'
    username: '{{ vcenter_username }}'
    password: '{{ vcenter_password }}'
    esxi_hostname: '{{ esxi_hostname }}'
'''

RETURN = r'''
drs_rule_facts:
    description: metadata about DNS config from given cluster / host system
    returned: always
    type: dict
    sample: {
                "DC0_C0_H0": {
                    "dhcp": true,
                    "domain_name": "localdomain",
                    "host_name": "localhost",
                    "ip_address": [
                        "8.8.8.8"
                    ],
                    "search_doamin": [
                        "localdomain"
                    ],
                    "virtual_nic_device": "vmk0"
                }
            }
'''

from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.vmware import vmware_argument_spec, PyVmomi


class VmwareDnsFactsManager(PyVmomi):
    def __init__(self, module):
        super(VmwareDnsFactsManager, self).__init__(module)
        cluster_name = self.params.get('cluster_name', None)
        esxi_host_name = self.params.get('esxi_hostname', None)
        self.hosts = []
        if cluster_name:
            cluster_obj = self.find_cluster_by_name(cluster_name=cluster_name)
            if cluster_obj:
                self.hosts = [host for host in cluster_obj.host]
            else:
                module.fail_json(changed=False, msg="Cluster '%s' not found" % cluster_name)
        elif esxi_host_name:
            esxi_host_obj = self.find_hostsystem_by_name(host_name=esxi_host_name)
            if esxi_host_obj:
                self.hosts = [esxi_host_obj]
            else:
                module.fail_json(changed=False, msg="ESXi '%s' not found" % esxi_host_name)

    def gather_dns_facts(self):
        hosts_facts = {}
        for host in self.hosts:
            host_facts = {}
            dns_config = host.config.network.dnsConfig
            host_facts['dhcp'] = dns_config.dhcp
            host_facts['virtual_nic_device'] = dns_config.virtualNicDevice
            host_facts['host_name'] = dns_config.hostName
            host_facts['domain_name'] = dns_config.domainName
            host_facts['ip_address'] = [ip for ip in dns_config.address]
            host_facts['search_doamin'] = [domain for domain in dns_config.searchDomain]
            hosts_facts[host.name] = host_facts
        return hosts_facts


def main():
    argument_spec = vmware_argument_spec()
    argument_spec.update(
        cluster_name=dict(type='str', required=False),
        esxi_hostname=dict(type='str', required=False),
    )

    module = AnsibleModule(
        argument_spec=argument_spec,
        required_one_of=[
            ['cluster_name', 'esxi_hostname'],
        ]
    )

    vmware_dns_config = VmwareDnsFactsManager(module)
    module.exit_json(changed=False, hosts_dns_facts=vmware_dns_config.gather_dns_facts())


if __name__ == "__main__":
    main()
