#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# Copyright (c) 2017 F5 Networks Inc.
# GNU General Public License v3.0 (see COPYING 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': 'certified'}

DOCUMENTATION = r'''
---
module: bigiq_regkey_pool
short_description: Manages registration key pools on BIG-IQ
description:
  - Manages registration key (regkey) pools on a BIG-IQ. These pools function as
    a container in-which you will add lists of registration keys. To add registration
    keys, use the C(bigiq_regkey_license) module.
version_added: 2.5
options:
  name:
    description:
      - Specifies the name of the registration key pool.
      - You must be mindful to name your registration pools unique names. While
        BIG-IQ does not require this, this module does. If you do not do this,
        the behavior of the module is undefined and you may end up putting
        licenses in the wrong registration key pool.
    required: True
  description:
    description:
      - A description to attach to the pool.
  state:
    description:
      - The state of the regkey pool on the system.
      - When C(present), guarantees that the pool exists.
      - When C(absent), removes the pool, and the licenses it contains, from the
        system.
    default: present
    choices:
      - absent
      - present
requirements:
  - BIG-IQ >= 5.3.0
extends_documentation_fragment: f5
author:
  - Tim Rupp (@caphrim007)
'''

EXAMPLES = r'''
- name: Create a registration key (regkey) pool to hold individual device licenses
  bigiq_regkey_pool:
    name: foo-pool
    password: secret
    server: lb.mydomain.com
    state: present
    user: admin
  delegate_to: localhost
'''

RETURN = r'''
description:
  description: New description of the regkey pool.
  returned: changed
  type: string
  sample: My description
'''

from ansible.module_utils.basic import AnsibleModule

try:
    from library.module_utils.network.f5.bigiq import HAS_F5SDK
    from library.module_utils.network.f5.bigiq import F5Client
    from library.module_utils.network.f5.common import F5ModuleError
    from library.module_utils.network.f5.common import AnsibleF5Parameters
    from library.module_utils.network.f5.common import f5_argument_spec
    try:
        from library.module_utils.network.f5.common import iControlUnexpectedHTTPError
    except ImportError:
        HAS_F5SDK = False
except ImportError:
    from ansible.module_utils.network.f5.bigiq import HAS_F5SDK
    from ansible.module_utils.network.f5.bigiq import F5Client
    from ansible.module_utils.network.f5.common import F5ModuleError
    from ansible.module_utils.network.f5.common import AnsibleF5Parameters
    from ansible.module_utils.network.f5.common import f5_argument_spec
    try:
        from ansible.module_utils.network.f5.common import iControlUnexpectedHTTPError
    except ImportError:
        HAS_F5SDK = False


class Parameters(AnsibleF5Parameters):
    api_map = {

    }

    api_attributes = [
        'description'
    ]

    returnables = [
        'description'
    ]

    updatables = [
        'description'
    ]

    def to_return(self):
        result = {}
        try:
            for returnable in self.returnables:
                result[returnable] = getattr(self, returnable)
            result = self._filter_params(result)
        except Exception:
            pass
        return result


class ModuleParameters(Parameters):
    @property
    def uuid(self):
        """Returns UUID of a given name

        Will search for a given name and return the first one returned to us. If no name,
        and therefore no ID, is found, will return the string "none". The string "none"
        is returned because if we were to return the None value, it would cause the
        license loading code to append a None string to the URI; essentially asking the
        remote device for its collection (which we dont want and which would cause the SDK
        to return an False error.

        :return:
        """
        collection = self.client.api.cm.device.licensing.pool.regkey.licenses_s.get_collection()
        resource = next((x for x in collection if x.name == self._values['name']), None)
        if resource:
            return resource.id
        else:
            return "none"


class ApiParameters(Parameters):
    @property
    def uuid(self):
        return self._values['id']


class Changes(Parameters):
    pass


class ReportableChanges(Changes):
    pass


class UsableChanges(Changes):
    pass


class Difference(object):
    def __init__(self, want, have=None):
        self.want = want
        self.have = have

    def compare(self, param):
        try:
            result = getattr(self, param)
            return result
        except AttributeError:
            return self.__default(param)

    def __default(self, param):
        attr1 = getattr(self.want, param)
        try:
            attr2 = getattr(self.have, param)
            if attr1 != attr2:
                return attr1
        except AttributeError:
            return attr1


class ModuleManager(object):
    def __init__(self, *args, **kwargs):
        self.module = kwargs.get('module', None)
        self.client = kwargs.get('client', None)
        self.want = ModuleParameters(client=self.client, params=self.module.params)
        self.have = ApiParameters()
        self.changes = UsableChanges()

    def _set_changed_options(self):
        changed = {}
        for key in Parameters.returnables:
            if getattr(self.want, key) is not None:
                changed[key] = getattr(self.want, key)
        if changed:
            self.changes = UsableChanges(params=changed)

    def _update_changed_options(self):
        diff = Difference(self.want, self.have)
        updatables = Parameters.updatables
        changed = dict()
        for k in updatables:
            change = diff.compare(k)
            if change is None:
                continue
            else:
                if isinstance(change, dict):
                    changed.update(change)
                else:
                    changed[k] = change
        if changed:
            self.changes = Changes(params=changed)
            return True
        return False

    def should_update(self):
        result = self._update_changed_options()
        if result:
            return True
        return False

    def exec_module(self):
        changed = False
        result = dict()
        state = self.want.state

        try:
            if state == "present":
                changed = self.present()
            elif state == "absent":
                changed = self.absent()
        except iControlUnexpectedHTTPError as e:
            raise F5ModuleError(str(e))

        reportable = ReportableChanges(params=self.changes.to_return())
        changes = reportable.to_return()
        result.update(**changes)
        result.update(dict(changed=changed))
        self._announce_deprecations(result)
        return result

    def _announce_deprecations(self, result):
        warnings = result.pop('__warnings', [])
        for warning in warnings:
            self.module.deprecate(
                msg=warning['msg'],
                version=warning['version']
            )

    def present(self):
        if self.exists():
            return self.update()
        else:
            return self.create()

    def exists(self):
        result = self.client.api.cm.device.licensing.pool.regkey.licenses_s.licenses.exists(
            id=self.want.uuid
        )
        return result

    def update(self):
        self.have = self.read_current_from_device()
        if not self.should_update():
            return False
        if self.module.check_mode:
            return True
        self.update_on_device()
        return True

    def remove(self):
        if self.module.check_mode:
            return True
        self.remove_from_device()
        if self.exists():
            raise F5ModuleError("Failed to delete the resource.")
        return True

    def create(self):
        self._set_changed_options()
        if self.module.check_mode:
            return True
        self.create_on_device()
        return True

    def create_on_device(self):
        params = self.want.api_params()
        self.client.api.cm.device.licensing.pool.regkey.licenses_s.licenses.create(
            name=self.want.name,
            **params
        )

    def update_on_device(self):
        params = self.changes.api_params()
        resource = self.client.api.cm.device.licensing.pool.regkey.licenses_s.licenses.load(
            id=self.want.uuid
        )
        resource.modify(**params)

    def absent(self):
        if self.exists():
            return self.remove()
        return False

    def remove_from_device(self):
        resource = self.client.api.cm.device.licensing.pool.regkey.licenses_s.licenses.load(
            id=self.want.uuid
        )
        if resource:
            resource.delete()

    def read_current_from_device(self):
        resource = self.client.api.cm.device.licensing.pool.regkey.licenses_s.licenses.load(
            id=self.want.uuid
        )
        result = resource.attrs
        return ApiParameters(params=result)


class ArgumentSpec(object):
    def __init__(self):
        self.supports_check_mode = True
        argument_spec = dict(
            name=dict(required=True),
            description=dict(),
            state=dict(
                default='present',
                choices=['absent', 'present']
            )
        )
        self.argument_spec = {}
        self.argument_spec.update(f5_argument_spec)
        self.argument_spec.update(argument_spec)


def main():
    spec = ArgumentSpec()

    module = AnsibleModule(
        argument_spec=spec.argument_spec,
        supports_check_mode=spec.supports_check_mode
    )
    if not HAS_F5SDK:
        module.fail_json(msg="The python f5-sdk module is required")

    try:
        client = F5Client(**module.params)
        mm = ModuleManager(module=module, client=client)
        results = mm.exec_module()
        module.exit_json(**results)
    except F5ModuleError as e:
        module.fail_json(msg=str(e))


if __name__ == '__main__':
    main()
