#!/usr/bin/python
# -*- coding: utf-8 -*-

# Copyright: (c) 2021, Shreyas Srish (@shrsr) <ssrish@cisco.com>
# GNU General Public License v3.0+ (see LICENSE 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: mso_schema_template_bd_dhcp_policy
short_description: Manage BD DHCP Policy in schema templates
description:
- Manage BD DHCP policies in schema templates on Cisco ACI Multi-Site.
author:
- Shreyas Srish (@shrsr)
options:
  schema:
    description:
    - The name of the schema.
    type: str
    required: yes
  template:
    description:
    - The name of the template to change.
    type: str
    required: yes
  bd:
    description:
    - The name of the BD to manage.
    type: str
    required: yes
  dhcp_policy:
    description:
    - The DHCP Policy
    type: str
    aliases: [ name ]
  version:
    description:
    - The version of DHCP Relay Policy.
    type: int
  dhcp_option_policy:
    description:
    - The DHCP Option Policy.
    type: dict
    suboptions:
      name:
        description:
        - The name of the DHCP Option Policy.
        type: str
        required: yes
      version:
        description:
        - The version of the DHCP Option Policy.
        type: int
        required: yes
  state:
    description:
    - Use C(present) or C(absent) for adding or removing.
    - Use C(query) for listing an object or multiple objects.
    type: str
    choices: [ absent, present, query ]
    default: present
notes:
- This module can only be used on versions of MSO that are 3.1.1h or greater.
extends_documentation_fragment: cisco.mso.modules
'''

EXAMPLES = r'''
- name: Add a new DHCP policy to a BD
  cisco.mso.mso_schema_template_bd_dhcp_policy:
    host: mso_host
    username: admin
    password: SomeSecretPassword
    schema: Schema 1
    template: Template 1
    bd: BD 1
    name: ansible_test
    version: 1
    dhcp_option_policy:
      name: ansible_test_option
      version: 1
    state: present
  delegate_to: localhost

- name: Remove a DHCP policy from a BD
  cisco.mso.mso_schema_template_bd_dhcp_policy:
    host: mso_host
    username: admin
    password: SomeSecretPassword
    schema: Schema 1
    template: Template 1
    bd: BD 1
    name: ansible_test
    version: 1
    state: absent
  delegate_to: localhost

- name: Query a specific BD DHCP Policy
  cisco.mso.mso_schema_template_bd_dhcp_policy:
    host: mso_host
    username: admin
    password: SomeSecretPassword
    schema: Schema 1
    template: Template 1
    bd: BD 1
    name: ansible_test
    state: query
  delegate_to: localhost
  register: query_result

- name: Query all BD DHCP Policies
  cisco.mso.mso_schema_template_bd_dhcp_policy:
    host: mso_host
    username: admin
    password: SomeSecretPassword
    schema: Schema 1
    template: Template 1
    bd: BD 1
    state: query
  delegate_to: localhost
  register: query_result
'''

RETURN = r'''
'''

from ansible.module_utils.basic import AnsibleModule
from ansible_collections.cisco.mso.plugins.module_utils.mso import MSOModule, mso_argument_spec, mso_dhcp_option_spec


def main():
    argument_spec = mso_argument_spec()
    argument_spec.update(
        schema=dict(type='str', required=True),
        template=dict(type='str', required=True),
        bd=dict(type='str', required=True),
        dhcp_policy=dict(type='str', aliases=['name']),
        version=dict(type='int'),
        dhcp_option_policy=dict(type='dict', options=mso_dhcp_option_spec()),
        state=dict(type='str', default='present', choices=['absent', 'present', 'query']),
    )

    module = AnsibleModule(
        argument_spec=argument_spec,
        supports_check_mode=True,
        required_if=[
            ['state', 'absent', ['dhcp_policy']],
            ['state', 'present', ['dhcp_policy', 'version']],
        ],
    )

    schema = module.params.get('schema')
    template = module.params.get('template').replace(' ', '')
    bd = module.params.get('bd')
    dhcp_policy = module.params.get('dhcp_policy')
    dhcp_option_policy = module.params.get('dhcp_option_policy')
    version = module.params.get('version')
    state = module.params.get('state')

    mso = MSOModule(module)

    # Get schema
    schema_id, schema_path, schema_obj = mso.query_schema(schema)

    # Get template
    templates = [t.get('name') for t in schema_obj.get('templates')]
    if template not in templates:
        mso.fail_json(msg="Provided template '{0}' does not exist. Existing templates: {1}".format(template, ', '.join(templates)))
    template_idx = templates.index(template)

    # Get BD
    bds = [b.get('name') for b in schema_obj.get('templates')[template_idx]['bds']]
    if bd not in bds:
        mso.fail_json(msg="Provided BD '{0}' does not exist. Existing BDs: {1}".format(bd, ', '.join(bds)))
    bd_idx = bds.index(bd)

    # Check if DHCP policy already exists
    if dhcp_policy:
        check_policy = mso.get_obj("policies/dhcp/relay", name=dhcp_policy, key="DhcpRelayPolicies")
        if check_policy:
            pass
        else:
            mso.fail_json(msg="DHCP policy '{dhcp_policy}' does not exist".format(dhcp_policy=dhcp_policy))

    # Check if DHCP option policy already exists
    if dhcp_option_policy:
        check_option_policy = mso.get_obj("policies/dhcp/option", name=dhcp_option_policy.get('name'), key="DhcpRelayPolicies")
        if check_option_policy:
            pass
        else:
            mso.fail_json(msg="DHCP option policy '{dhcp_option_policy}' does not exist".format(dhcp_option_policy=dhcp_option_policy.get('name')))

    # Get DHCP policies
    dhcp_policies = [s.get('name') for s in schema_obj.get('templates')[template_idx]['bds'][bd_idx]['dhcpLabels']]
    if dhcp_policy in dhcp_policies:
        dhcp_idx = dhcp_policies.index(dhcp_policy)
        # FIXME: Changes based on index are DANGEROUS
        dhcp_policy_path = '/templates/{0}/bds/{1}/dhcpLabels/{2}'.format(template, bd, dhcp_idx)
        mso.existing = schema_obj.get('templates')[template_idx]['bds'][bd_idx]['dhcpLabels'][dhcp_idx]

    if state == 'query':
        if dhcp_policy is None:
            mso.existing = schema_obj.get('templates')[template_idx]['bds'][bd_idx]['dhcpLabels']
        elif not mso.existing:
            mso.fail_json(msg="DHCP policy not associated with the bd")
        mso.exit_json()

    dhcp_policy_paths = '/templates/{0}/bds/{1}/dhcpLabels'.format(template, bd)
    ops = []

    mso.previous = mso.existing
    if state == 'absent':
        if mso.existing:
            mso.sent = mso.existing = {}
            ops.append(dict(op='remove', path=dhcp_policy_path))

    elif state == 'present':
        payload = dict(
            name=dhcp_policy,
            version=version,
            dhcpOptionLabel=dhcp_option_policy,
        )

        mso.sanitize(payload, collate=True)

        if mso.existing:
            ops.append(dict(op='replace', path=dhcp_policy_path, value=mso.sent))
        else:
            ops.append(dict(op='add', path=dhcp_policy_paths + '/-', value=mso.sent))

        mso.existing = mso.proposed

    if not module.check_mode:
        mso.request(schema_path, method='PATCH', data=ops)

    mso.exit_json()


if __name__ == "__main__":
    main()