#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2016 Red Hat, Inc.
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

ANSIBLE_METADATA = {'metadata_version': '1.1',
                    'status': ['preview'],
                    'supported_by': 'community'}


DOCUMENTATION = '''
---
module: ovirt_host_facts
short_description: Retrieve facts about one or more oVirt/RHV hosts
author: "Ondra Machacek (@machacekondra)"
version_added: "2.3"
description:
    - "Retrieve facts about one or more oVirt/RHV hosts."
notes:
    - "This module creates a new top-level C(ovirt_hosts) fact, which
       contains a list of hosts."
options:
    pattern:
      description:
        - "Search term which is accepted by oVirt/RHV search backend."
        - "For example to search host X from datacenter Y use following pattern:
           name=X and datacenter=Y"
    all_content:
      description:
        - "If I(true) all the attributes of the hosts should be
           included in the response."
      default: False
      version_added: "2.7"
      type: bool
    cluster_version:
      description:
        - "Filter the hosts based on the cluster version."
      type: str
      version_added: "2.8"

extends_documentation_fragment: ovirt_facts
'''

EXAMPLES = '''
# Examples don't contain auth parameter for simplicity,
# look at ovirt_auth module to see how to reuse authentication:

# Gather facts about all hosts which names start with C(host) and
# belong to data center C(west):
- ovirt_host_facts:
    pattern: name=host* and datacenter=west
- debug:
    var: ovirt_hosts
# All hosts with cluster version 4.2:
- ovirt_host_facts:
    pattern: name=host*
    cluster_version: "4.2"
- debug:
    var: ovirt_hosts
'''

RETURN = '''
ovirt_hosts:
    description: "List of dictionaries describing the hosts. Host attributes are mapped to dictionary keys,
                  all hosts attributes can be found at following url: http://ovirt.github.io/ovirt-engine-api-model/master/#types/host."
    returned: On success.
    type: list
'''

import traceback

from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.ovirt import (
    check_sdk,
    create_connection,
    get_dict_of_struct,
    ovirt_facts_full_argument_spec,
)


def get_filtered_hosts(cluster_version, hosts, connection):
    # Filtering by cluster version returns only those which have same cluster version as input
    filtered_hosts = []
    for host in hosts:
        cluster = connection.follow_link(host.cluster)
        cluster_version_host = str(cluster.version.major) + '.' + str(cluster.version.minor)
        if cluster_version_host == cluster_version:
            filtered_hosts.append(host)
    return filtered_hosts


def main():
    argument_spec = ovirt_facts_full_argument_spec(
        pattern=dict(default='', required=False),
        all_content=dict(default=False, type='bool'),
        cluster_version=dict(default=None, type='str'),
    )
    module = AnsibleModule(argument_spec)

    check_sdk(module)

    try:
        auth = module.params.pop('auth')
        connection = create_connection(auth)
        hosts_service = connection.system_service().hosts_service()
        hosts = hosts_service.list(
            search=module.params['pattern'],
            all_content=module.params['all_content']
        )
        cluster_version = module.params.get('cluster_version')
        if cluster_version is not None:
            hosts = get_filtered_hosts(cluster_version, hosts, connection)
        module.exit_json(
            changed=False,
            ansible_facts=dict(
                ovirt_hosts=[
                    get_dict_of_struct(
                        struct=c,
                        connection=connection,
                        fetch_nested=module.params.get('fetch_nested'),
                        attributes=module.params.get('nested_attributes'),
                    ) for c in hosts
                ],
            ),
        )
    except Exception as e:
        module.fail_json(msg=str(e), exception=traceback.format_exc())
    finally:
        connection.close(logout=auth.get('token') is None)


if __name__ == '__main__':
    main()
