# -*- coding: utf-8 -*-
'''
Management of OpenStack Keystone Endpoints
==========================================

.. versionadded:: 2018.3.0

:depends: shade
:configuration: see :py:mod:`salt.modules.keystoneng` for setup instructions

Example States

.. code-block:: yaml

    create endpoint:
      keystone_endpoint.present:
        - name: public
        - url: https://example.org:9292
        - region: RegionOne
        - service_name: glance

    destroy endpoint:
      keystone_endpoint.absent:
        - name: public
        - url: https://example.org:9292
        - region: RegionOne
        - service_name: glance

    create multiple endpoints:
      keystone_endpoint.absent:
        - names:
            - public
            - admin
            - internal
        - url: https://example.org:9292
        - region: RegionOne
        - service_name: glance
'''

from __future__ import absolute_import, unicode_literals, print_function

__virtualname__ = 'keystone_endpoint'


def __virtual__():
    if 'keystoneng.endpoint_get' in __salt__:
        return __virtualname__
    return (False, 'The keystoneng execution module failed to load: shade python module is not available')


def _common(ret, name, service_name, kwargs):
    '''
    Returns: tuple whose first element is a bool indicating success or failure
             and the second element is either a ret dict for salt or an object
    '''
    if 'interface' not in kwargs and 'public_url' not in kwargs:
        kwargs['interface'] = name
    service = __salt__['keystoneng.service_get'](name_or_id=service_name)

    if not service:
        ret['comment'] = 'Cannot find service'
        ret['result'] = False
        return (False, ret)

    filters = kwargs.copy()
    filters.pop('enabled', None)
    filters.pop('url', None)
    filters['service_id'] = service.id
    kwargs['service_name_or_id'] = service.id
    endpoints = __salt__['keystoneng.endpoint_search'](filters=filters)

    if len(endpoints) > 1:
        ret['comment'] = "Multiple endpoints match criteria"
        ret['result'] = False
        return ret
    endpoint = endpoints[0] if endpoints else None
    return (True, endpoint)


def present(name, service_name, auth=None, **kwargs):
    '''
    Ensure an endpoint exists and is up-to-date

    name
        Interface name

    url
        URL of the endpoint

    service_name
        Service name or ID

    region
        The region name to assign the endpoint

    enabled
        Boolean to control if endpoint is enabled
    '''
    ret = {'name': name,
           'changes': {},
           'result': True,
           'comment': ''}

    kwargs = __utils__['args.clean_kwargs'](**kwargs)

    __salt__['keystoneng.setup_clouds'](auth)

    success, val = _, endpoint = _common(ret, name, service_name, kwargs)
    if not success:
        return val

    if not endpoint:
        if __opts__['test'] is True:
            ret['result'] = None
            ret['changes'] = kwargs
            ret['comment'] = 'Endpoint will be created.'
            return ret

        # NOTE(SamYaple): Endpoints are returned as a list which can contain
        # several items depending on the options passed
        endpoints = __salt__['keystoneng.endpoint_create'](**kwargs)
        if len(endpoints) == 1:
            ret['changes'] = endpoints[0]
        else:
            for i, endpoint in enumerate(endpoints):
                ret['changes'][i] = endpoint
        ret['comment'] = 'Created endpoint'
        return ret

    changes = __salt__['keystoneng.compare_changes'](endpoint, **kwargs)
    if changes:
        if __opts__['test'] is True:
            ret['result'] = None
            ret['changes'] = changes
            ret['comment'] = 'Endpoint will be updated.'
            return ret

        kwargs['endpoint_id'] = endpoint.id
        __salt__['keystoneng.endpoint_update'](**kwargs)
        ret['changes'].update(changes)
        ret['comment'] = 'Updated endpoint'

    return ret


def absent(name, service_name, auth=None, **kwargs):
    '''
    Ensure an endpoint does not exists

    name
        Interface name

    url
        URL of the endpoint

    service_name
        Service name or ID

    region
        The region name to assign the endpoint
    '''
    ret = {'name': name,
           'changes': {},
           'result': True,
           'comment': ''}

    __salt__['keystoneng.setup_clouds'](auth)

    success, val = _, endpoint = _common(ret, name, service_name, kwargs)
    if not success:
        return val

    if endpoint:
        if __opts__['test'] is True:
            ret['result'] = None
            ret['changes'] = {'id': endpoint.id}
            ret['comment'] = 'Endpoint will be deleted.'
            return ret

        __salt__['keystoneng.endpoint_delete'](id=endpoint.id)
        ret['changes']['id'] = endpoint.id
        ret['comment'] = 'Deleted endpoint'

    return ret