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

# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
"""Control Univention Corporate Registry."""

from __future__ import (absolute_import, division, print_function)

__metaclass__ = type

ANSIBLE_METADATA = {"metadata_version": "1.1", "status": ["preview"], "supported_by": "community"}

DOCUMENTATION = """
---
module: ucr
short_description: Manage variables in univention configuration registry.
version_added: 1.1.0
description:
  - "This module allows to manage variables inside the univention configuration registry
    on a univention corporate server (UCS)."
options:
  path:
    description:
      - Path for the variable
    aliases:
      - name
    required: True
    type: str
  value:
    description:
      - New value of the variable
    required: False
    type: str
    default: ""
  state:
    required: False
    default: "present"
    choices: ["present", "absent"]
    type: str
    description:
      - Whether the variable should be exist or not.
author:
  - Robert Kaussow (@xoxys)
"""

EXAMPLES = """
# Set variable to force https in ucs frontend
- name: Force https
  ucr:
    path: apache2/force_https
    value: yes

# Allow another user as root to login as ssh
- name: Add ssh user
  ucr:
    path: auth/sshd/user/myuser
    value: yes
"""

RETURN = """
original_message:
  description: The original name param that was passed in
  type: str
  returned: success
message:
  description: The output message that the sample module generates
  type: str
  returned: success
"""

from ansible.module_utils.basic import AnsibleModule

try:
    from univention.config_registry import ConfigRegistry
    from univention.config_registry.frontend import ucr_update
    HAS_UNIVENTION = True
except ImportError:
    HAS_UNIVENTION = False


def get_variable(ucr, path):
    ucr.load()
    return ucr.get(path) if path in ucr else None


def set_variable(ucr, path, value, result):  # noqa
    org_value = get_variable(ucr, path)
    ucr_update(ucr, {path: value})
    new_value = get_variable(ucr, path)
    return org_value != new_value


def dry_variable(ucr, path, value, result):  # noqa
    org_value = get_variable(ucr, path)
    return org_value != value


def main():
    module_args = dict(
        path=dict(type="str", required=True, aliases=["name"]),
        value=dict(type="str", required=False, default=""),
        state=dict(default="present", choices=["present", "absent"], type="str")
    )

    required_if = [["state", "present", ["value"]]]

    module = AnsibleModule(
        argument_spec=module_args, supports_check_mode=True, required_if=required_if
    )

    if not HAS_UNIVENTION:
        module.fail_json(msg="univention required for this module")

    ucr = ConfigRegistry()

    result = dict(changed=False, original_message="", message="")

    path = module.params["path"]
    value = module.params["value"]
    if module.params["state"] == "present" and (value is None or value == "None"):
        value = ""
    elif module.params["state"] == "absent":
        value = None

    if not module.check_mode:
        result["changed"] = set_variable(ucr, path, value, result)
    else:
        result["changed"] = dry_variable(ucr, path, value, result)

    module.exit_json(**result)


if __name__ == "__main__":
    main()