#!/usr/bin/python

# Copyright (c) 2015 Hewlett-Packard Development Company, L.P.
#
# This module 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.
#
# This software 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 this software.  If not, see <http://www.gnu.org/licenses/>.

try:
    import shade
    HAS_SHADE = True
except ImportError:
    HAS_SHADE = False

DOCUMENTATION = '''
---
module: os_subnets_facts
short_description: Retrieve facts about one or more OpenStack subnets.
version_added: "2.0"
author: "Davide Agnello (@dagnello)"
description:
    - Retrieve facts about one or more subnets from OpenStack.
requirements:
    - "python >= 2.6"
    - "shade"
options:
   subnet:
     description:
        - Name or ID of the subnet
     required: false
   filters:
     description:
        - A dictionary of meta data to use for further filtering.  Elements of
          this dictionary may be additional dictionaries.
     required: false
extends_documentation_fragment: openstack
'''

EXAMPLES = '''
- name: Gather facts about previously created subnets
  os_subnets_facts:
    auth:
      auth_url: https://your_api_url.com:9000/v2.0
      username: user
      password: password
      project_name: someproject

- name: Show openstack subnets
  debug:
    var: openstack_subnets

- name: Gather facts about a previously created subnet by name
  os_subnets_facts:
    auth:
      auth_url: https://your_api_url.com:9000/v2.0
      username: user
      password: password
      project_name: someproject
    name: subnet1

- name: Show openstack subnets
  debug:
    var: openstack_subnets

- name: Gather facts about a previously created subnet with filter
  # Note: name and filters parameters are not mutually exclusive
  os_subnets_facts:
    auth:
      auth_url: https://your_api_url.com:9000/v2.0
      username: user
      password: password
      project_name: someproject
    filters:
      tenant_id: 55e2ce24b2a245b09f181bf025724cbe

- name: Show openstack subnets
  debug:
    var: openstack_subnets
'''

RETURN = '''
openstack_subnets:
    description: has all the openstack facts about the subnets
    returned: always, but can be null
    type: complex
    contains:
        id:
            description: Unique UUID.
            returned: success
            type: string
        name:
            description: Name given to the subnet.
            returned: success
            type: string
        network_id:
            description: Network ID this subnet belongs in.
            returned: success
            type: string
        cidr:
            description: Subnet's CIDR.
            returned: success
            type: string
        gateway_ip:
            description: Subnet's gateway ip.
            returned: success
            type: string
        enable_dhcp:
            description: DHCP enable flag for this subnet.
            returned: success
            type: bool
        ip_version:
            description: IP version for this subnet.
            returned: success
            type: int
        tenant_id:
            description: Tenant id associated with this subnet.
            returned: success
            type: string
        dns_nameservers:
            description: DNS name servers for this subnet.
            returned: success
            type: list of strings
        allocation_pools:
            description: Allocation pools associated with this subnet.
            returned: success
            type: list of dicts
'''

def main():

    argument_spec = openstack_full_argument_spec(
        name=dict(required=False, default=None),
        filters=dict(required=False, type='dict', default=None)
    )
    module = AnsibleModule(argument_spec)

    if not HAS_SHADE:
        module.fail_json(msg='shade is required for this module')

    try:
        cloud = shade.openstack_cloud(**module.params)
        subnets = cloud.search_subnets(module.params['name'],
                                         module.params['filters'])
        module.exit_json(changed=False, ansible_facts=dict(
            openstack_subnets=subnets))

    except shade.OpenStackCloudException as e:
        module.fail_json(msg=str(e))

# this is magic, see lib/ansible/module_common.py
from ansible.module_utils.basic import *
from ansible.module_utils.openstack import *
if __name__ == '__main__':
    main()