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

# Copyright (c) 2017, Eike Frost <ei@kefro.st>
# Copyright (c) 2021, Christophe Gilles <christophe.gilles54@gmail.com>
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or
# https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later
from __future__ import absolute_import, division, print_function
__metaclass__ = type

DOCUMENTATION = '''
---
module: keycloak_authz_authorization_scope

short_description: Allows administration of Keycloak client authorization scopes via Keycloak API

version_added: 6.6.0

description:
    - This module allows the administration of Keycloak client Authorization Scopes via the Keycloak REST
      API. Authorization Scopes are only available if a client has Authorization enabled.

    - This module requires access to the REST API via OpenID Connect; the user connecting and the realm
      being used must have the requisite access rights. In a default Keycloak installation, admin-cli
      and an admin user would work, as would a separate realm definition with the scope tailored
      to your needs and a user having the expected roles.

    - The names of module options are snake_cased versions of the camelCase options used by Keycloak.
      The Authorization Services paths and payloads have not officially been documented by the Keycloak project.
      U(https://www.puppeteers.net/blog/keycloak-authorization-services-rest-api-paths-and-payload/)

attributes:
    check_mode:
        support: full
    diff_mode:
        support: full

options:
    state:
        description:
            - State of the authorization scope.
            - On C(present), the authorization scope will be created (or updated if it exists already).
            - On C(absent), the authorization scope will be removed if it exists.
        choices: ['present', 'absent']
        default: 'present'
        type: str
    name:
        description:
            - Name of the authorization scope to create.
        type: str
        required: true
    display_name:
        description:
            - The display name of the authorization scope.
        type: str
        required: false
    icon_uri:
        description:
            - The icon URI for the authorization scope.
        type: str
        required: false
    client_id:
        description:
            - The C(clientId) of the Keycloak client that should have the authorization scope.
            - This is usually a human-readable name of the Keycloak client.
        type: str
        required: true
    realm:
        description:
            - The name of the Keycloak realm the Keycloak client is in.
        type: str
        required: true

extends_documentation_fragment:
    - community.general.keycloak
    - community.general.attributes

author:
    - Samuli Seppänen (@mattock)
'''

EXAMPLES = '''
- name: Manage Keycloak file:delete authorization scope
  keycloak_authz_authorization_scope:
    name: file:delete
    state: present
    display_name: File delete
    client_id: myclient
    realm: myrealm
    auth_keycloak_url: http://localhost:8080/auth
    auth_username: keycloak
    auth_password: keycloak
    auth_realm: master
'''

RETURN = '''
msg:
    description: Message as to what action was taken.
    returned: always
    type: str

end_state:
    description: Representation of the authorization scope after module execution.
    returned: on success
    type: complex
    contains:
        id:
            description: ID of the authorization scope.
            type: str
            returned: when I(state=present)
            sample: a6ab1cf2-1001-40ec-9f39-48f23b6a0a41
        name:
            description: Name of the authorization scope.
            type: str
            returned: when I(state=present)
            sample: file:delete
        display_name:
            description: Display name of the authorization scope.
            type: str
            returned: when I(state=present)
            sample: File delete
        icon_uri:
            description: Icon URI for the authorization scope.
            type: str
            returned: when I(state=present)
            sample: http://localhost/icon.png

'''

from ansible_collections.community.general.plugins.module_utils.identity.keycloak.keycloak import KeycloakAPI, \
    keycloak_argument_spec, get_token, KeycloakError
from ansible.module_utils.basic import AnsibleModule


def main():
    """
    Module execution

    :return:
    """
    argument_spec = keycloak_argument_spec()

    meta_args = dict(
        state=dict(type='str', default='present',
                   choices=['present', 'absent']),
        name=dict(type='str', required=True),
        display_name=dict(type='str', required=False),
        icon_uri=dict(type='str', required=False),
        client_id=dict(type='str', required=True),
        realm=dict(type='str', required=True)
    )

    argument_spec.update(meta_args)

    module = AnsibleModule(argument_spec=argument_spec,
                           supports_check_mode=True,
                           required_one_of=(
                               [['token', 'auth_realm', 'auth_username', 'auth_password']]),
                           required_together=([['auth_realm', 'auth_username', 'auth_password']]))

    result = dict(changed=False, msg='', end_state={}, diff=dict(before={}, after={}))

    # Obtain access token, initialize API
    try:
        connection_header = get_token(module.params)
    except KeycloakError as e:
        module.fail_json(msg=str(e))

    kc = KeycloakAPI(module, connection_header)

    # Convenience variables
    state = module.params.get('state')
    name = module.params.get('name')
    display_name = module.params.get('display_name')
    icon_uri = module.params.get('icon_uri')
    client_id = module.params.get('client_id')
    realm = module.params.get('realm')

    # Get the "id" of the client based on the usually more human-readable
    # "clientId"
    cid = kc.get_client_id(client_id, realm=realm)
    if not cid:
        module.fail_json(msg='Invalid client %s for realm %s' %
                         (client_id, realm))

    # Get current state of the Authorization Scope using its name as the search
    # filter. This returns False if it is not found.
    before_authz_scope = kc.get_authz_authorization_scope_by_name(
        name=name, client_id=cid, realm=realm)

    # Generate a JSON payload for Keycloak Admin API. This is needed for
    # "create" and "update" operations.
    desired_authz_scope = {}
    desired_authz_scope['name'] = name
    desired_authz_scope['displayName'] = display_name
    desired_authz_scope['iconUri'] = icon_uri

    # Add "id" to payload for modify operations
    if before_authz_scope:
        desired_authz_scope['id'] = before_authz_scope['id']

    # Ensure that undefined (null) optional parameters are presented as empty
    # strings in the desired state. This makes comparisons with current state
    # much easier.
    for k, v in desired_authz_scope.items():
        if not v:
            desired_authz_scope[k] = ''

    # Do the above for the current state
    if before_authz_scope:
        for k in ['displayName', 'iconUri']:
            if k not in before_authz_scope:
                before_authz_scope[k] = ''

    if before_authz_scope and state == 'present':
        changes = False
        for k, v in desired_authz_scope.items():
            if before_authz_scope[k] != v:
                changes = True
                # At this point we know we have to update the object anyways,
                # so there's no need to do more work.
                break

        if changes:
            if module._diff:
                result['diff'] = dict(before=before_authz_scope, after=desired_authz_scope)

            if module.check_mode:
                result['changed'] = True
                result['msg'] = 'Authorization scope would be updated'
                module.exit_json(**result)
            else:
                kc.update_authz_authorization_scope(
                    payload=desired_authz_scope, id=before_authz_scope['id'], client_id=cid, realm=realm)
                result['changed'] = True
                result['msg'] = 'Authorization scope updated'
        else:
            result['changed'] = False
            result['msg'] = 'Authorization scope not updated'

        result['end_state'] = desired_authz_scope
    elif not before_authz_scope and state == 'present':
        if module._diff:
            result['diff'] = dict(before={}, after=desired_authz_scope)

        if module.check_mode:
            result['changed'] = True
            result['msg'] = 'Authorization scope would be created'
            module.exit_json(**result)
        else:
            kc.create_authz_authorization_scope(
                payload=desired_authz_scope, client_id=cid, realm=realm)
            result['changed'] = True
            result['msg'] = 'Authorization scope created'
            result['end_state'] = desired_authz_scope
    elif before_authz_scope and state == 'absent':
        if module._diff:
            result['diff'] = dict(before=before_authz_scope, after={})

        if module.check_mode:
            result['changed'] = True
            result['msg'] = 'Authorization scope would be removed'
            module.exit_json(**result)
        else:
            kc.remove_authz_authorization_scope(
                id=before_authz_scope['id'], client_id=cid, realm=realm)
            result['changed'] = True
            result['msg'] = 'Authorization scope removed'
    elif not before_authz_scope and state == 'absent':
        result['changed'] = False
    else:
        module.fail_json(msg='Unable to determine what to do with authorization scope %s of client %s in realm %s' % (
            name, client_id, realm))

    module.exit_json(**result)


if __name__ == '__main__':
    main()
