#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2016 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/>.
#

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


DOCUMENTATION = '''
---
module: ovirt_tags_facts
short_description: Retrieve facts about one or more oVirt/RHV tags
author: "Ondra Machacek (@machacekondra)"
version_added: "2.3"
description:
    - "Retrieve facts about one or more oVirt/RHV tags."
notes:
    - "This module creates a new top-level C(ovirt_tags) fact, which
       contains a list of tags"
options:
    name:
      description:
        - "Name of the tag which should be listed."
    vm:
      description:
        - "Name of the VM, which tags should be listed."
    host:
      description:
        - "Name of the host, which tags should be listed."
extends_documentation_fragment: ovirt
'''

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

# Gather facts about all tags, which names start with C(tag):
- ovirt_tags_facts:
    name: tag*
- debug:
    var: tags

# Gather facts about all tags, which are assigned to VM C(postgres):
- ovirt_tags_facts:
    vm: postgres
- debug:
    var: tags

# Gather facts about all tags, which are assigned to host C(west):
- ovirt_tags_facts:
    host: west
- debug:
    var: tags
'''

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

import fnmatch
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,
    search_by_name,
)


def main():
    argument_spec = ovirt_facts_full_argument_spec(
        name=dict(default=None),
        host=dict(default=None),
        vm=dict(default=None),
    )
    module = AnsibleModule(argument_spec)
    check_sdk(module)

    try:
        auth = module.params.pop('auth')
        connection = create_connection(auth)
        tags_service = connection.system_service().tags_service()
        tags = []
        all_tags = tags_service.list()
        if module.params['name']:
            tags.extend([
                t for t in all_tags
                if fnmatch.fnmatch(t.name, module.params['name'])
            ])
        if module.params['host']:
            hosts_service = connection.system_service().hosts_service()
            host = search_by_name(hosts_service, module.params['host'])
            if host is None:
                raise Exception("Host '%s' was not found." % module.params['host'])
            tags.extend([
                tag for tag in hosts_service.host_service(host.id).tags_service().list()
            ])
        if module.params['vm']:
            vms_service = connection.system_service().vms_service()
            vm = search_by_name(vms_service, module.params['vm'])
            if vm is None:
                raise Exception("Vm '%s' was not found." % module.params['vm'])
            tags.extend([
                tag for tag in vms_service.vm_service(vm.id).tags_service().list()
            ])

        if not (module.params['vm'] or module.params['host'] or module.params['name']):
            tags = all_tags

        module.exit_json(
            changed=False,
            ansible_facts=dict(
                ovirt_tags=[
                    get_dict_of_struct(
                        struct=t,
                        connection=connection,
                        fetch_nested=module.params['fetch_nested'],
                        attributes=module.params['nested_attributes'],
                    ) for t in tags
                ],
            ),
        )
    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()
