#!/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

ANSIBLE_METADATA = {'status': ['preview'],
                    'supported_by': 'community',
                    'version': '1.0'}

DOCUMENTATION = '''
---
module: os_user
short_description: Manage OpenStack Identity Users
extends_documentation_fragment: openstack
version_added: "2.0"
description:
    - Manage OpenStack Identity users. Users can be created,
      updated or deleted using this module. A user will be updated
      if I(name) matches an existing user and I(state) is present.
      The value for I(name) cannot be updated without deleting and
      re-creating the user.
options:
   name:
     description:
        - Username for the user
     required: true
   password:
     description:
        - Password for the user
     required: false
     default: None
   update_password:
     required: false
     default: always
     choices: ['always', 'on_create']
     version_added: "2.3"
     description:
        - C(always) will attempt to update password.  C(on_create) will only
          set the password for newly created users.
   email:
     description:
        - Email address for the user
     required: false
     default: None
   default_project:
     description:
        - Project name or ID that the user should be associated with by default
     required: false
     default: None
   domain:
     description:
        - Domain to create the user in if the cloud supports domains
     required: false
     default: None
   enabled:
     description:
        - Is the user enabled
     required: false
     default: True
   state:
     description:
       - Should the resource be present or absent.
     choices: [present, absent]
     default: present
requirements:
    - "python >= 2.6"
    - "shade"
'''

EXAMPLES = '''
# Create a user
- os_user:
    cloud: mycloud
    state: present
    name: demouser
    password: secret
    email: demo@example.com
    domain: default
    default_project: demo

# Delete a user
- os_user:
    cloud: mycloud
    state: absent
    name: demouser

# Create a user but don't update password if user exists
- os_user:
    cloud: mycloud
    state: present
    name: demouser
    password: secret
    update_password: on_create
    email: demo@example.com
    domain: default
    default_project: demo
'''


RETURN = '''
user:
    description: Dictionary describing the user.
    returned: On success when I(state) is 'present'
    type: dictionary
    contains:
        default_project_id:
            description: User default project ID. Only present with Keystone >= v3.
            type: string
            sample: "4427115787be45f08f0ec22a03bfc735"
        domain_id:
            description: User domain ID. Only present with Keystone >= v3.
            type: string
            sample: "default"
        email:
            description: User email address
            type: string
            sample: "demo@example.com"
        id:
            description: User ID
            type: string
            sample: "f59382db809c43139982ca4189404650"
        name:
            description: User name
            type: string
            sample: "demouser"
'''

def _needs_update(params_dict, user):
    for k, v in params_dict.items():
        if k not in ('password', 'update_password') and user[k] != v:
            return True

    # We don't get password back in the user object, so assume any supplied
    # password is a change.
    if (params_dict['password'] is not None and
            params_dict['update_password'] == 'always'):
        return True

    return False

def _get_domain_id(cloud, domain):
    try:
        # We assume admin is passing domain id
        domain_id = cloud.get_domain(domain)['id']
    except:
        # If we fail, maybe admin is passing a domain name.
        # Note that domains have unique names, just like id.
        try:
            domain_id = cloud.search_domains(filters={'name': domain})[0]['id']
        except:
            # Ok, let's hope the user is non-admin and passing a sane id
            domain_id = domain

    return domain_id

def _get_default_project_id(cloud, default_project):
    project = cloud.get_project(default_project)
    if not project:
        module.fail_json(msg='Default project %s is not valid' % default_project)

    return project['id']

def main():

    argument_spec = openstack_full_argument_spec(
        name=dict(required=True),
        password=dict(required=False, default=None),
        email=dict(required=False, default=None),
        default_project=dict(required=False, default=None),
        domain=dict(required=False, default=None),
        enabled=dict(default=True, type='bool'),
        state=dict(default='present', choices=['absent', 'present']),
        update_password=dict(default='always', choices=['always',
                                                        'on_create']),
    )

    module_kwargs = openstack_module_kwargs()
    module = AnsibleModule(
        argument_spec,
        **module_kwargs)

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

    name = module.params['name']
    password = module.params['password']
    email = module.params['email']
    default_project = module.params['default_project']
    domain = module.params['domain']
    enabled = module.params['enabled']
    state = module.params['state']
    update_password = module.params['update_password']

    try:
        cloud = shade.openstack_cloud(**module.params)
        user = cloud.get_user(name)

        domain_id = None
        if domain:
            opcloud = shade.operator_cloud(**module.params)
            domain_id = _get_domain_id(opcloud, domain)

        if state == 'present':
            if update_password in ('always', 'on_create'):
                if not password:
                    msg = ("update_password is %s but a password value is "
                          "missing") % update_password
                    self.fail_json(msg=msg)
            default_project_id = None
            if default_project:
                default_project_id = _get_default_project_id(cloud, default_project)

            if user is None:
                user = cloud.create_user(
                    name=name, password=password, email=email,
                    default_project=default_project_id, domain_id=domain_id,
                    enabled=enabled)
                changed = True
            else:
                params_dict = {'email': email, 'enabled': enabled,
                               'password': password,
                               'update_password': update_password}
                if domain_id is not None:
                    params_dict['domain_id'] = domain_id
                if default_project_id is not None:
                    params_dict['default_project_id'] = default_project_id

                if _needs_update(params_dict, user):
                    if update_password == 'always':
                        user = cloud.update_user(
                            user['id'], password=password, email=email,
                            default_project=default_project_id,
                            domain_id=domain_id, enabled=enabled)
                    else:
                        user = cloud.update_user(
                            user['id'], email=email,
                            default_project=default_project_id,
                            domain_id=domain_id, enabled=enabled)
                    changed = True
                else:
                    changed = False
            module.exit_json(changed=changed, user=user)

        elif state == 'absent':
            if user is None:
                changed=False
            else:
                cloud.delete_user(user['id'])
                changed=True
            module.exit_json(changed=changed)

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

from ansible.module_utils.basic import *
from ansible.module_utils.openstack import *


if __name__ == '__main__':
    main()
