#!/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': 'community'}

DOCUMENTATION = r'''
---
module: bigip_service_policy
short_description: Manages service policies on a BIG-IP.
description:
  - Service policies allow you to configure timers and port misuse rules,
    if enabled, on a per rule or per context basis.
version_added: 2.6
options:
  name:
    description:
      - Name of the service policy.
    required: True
  description:
    description:
      - Description of the service policy.
  timer_policy:
    description:
      - The timer policy to attach to the service policy.
  port_misuse_policy:
    description:
      - The port misuse policy to attach to the service policy.
      - Requires that C(afm) be provisioned to use. If C(afm) is not provisioned, this parameter
        will be ignored.
  state:
    description:
      - Whether the resource should exist or not.
    default: present
    choices:
      - present
      - absent
  partition:
    description:
      - Device partition to manage resources on.
    default: Common
extends_documentation_fragment: f5
author:
  - Tim Rupp (@caphrim007)
'''

EXAMPLES = r'''
- name: Create a service policy
  bigip_service_policy:
    name: foo
    timer_policy: timer1
    port_misuse_policy: misuse1
    timer_policy_enabled: yes
    port_misuse_policy_enabled: yes
    password: secret
    server: lb.mydomain.com
    state: present
    user: admin
  delegate_to: localhost
'''

RETURN = r'''
timer_policy:
  description: The new timer policy attached to the resource.
  returned: changed
  type: string
  sample: /Common/timer1
port_misuse_policy:
  description: The new port misuse policy attached to the resource.
  returned: changed
  type: string
  sample: /Common/misuse1
description:
  description: New description of the resource.
  returned: changed
  type: string
  sample: My service policy description
'''

from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.basic import env_fallback

try:
    from library.module_utils.network.f5.bigip import HAS_F5SDK
    from library.module_utils.network.f5.bigip 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 cleanup_tokens
    from library.module_utils.network.f5.common import fq_name
    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.bigip import HAS_F5SDK
    from ansible.module_utils.network.f5.bigip 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 cleanup_tokens
    from ansible.module_utils.network.f5.common import fq_name
    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 = {
        'portMisusePolicy': 'port_misuse_policy',
        'timerPolicy': 'timer_policy'
    }

    api_attributes = [
        'description', 'timerPolicy', 'portMisusePolicy'
    ]

    returnables = [
        'description', 'timer_policy', 'port_misuse_policy'
    ]

    updatables = [
        'description', 'timer_policy', 'port_misuse_policy'
    ]


class ApiParameters(Parameters):
    pass


class ModuleParameters(Parameters):
    @property
    def timer_policy(self):
        if self._values['timer_policy'] is None:
            return None
        if self._values['timer_policy'] == '':
            return ''
        return fq_name(self.partition, self._values['timer_policy'])

    @property
    def port_misuse_policy(self):
        if self._values['port_misuse_policy'] is None:
            return None
        if self._values['port_misuse_policy'] == '':
            return ''
        return fq_name(self.partition, self._values['port_misuse_policy'])


class Changes(Parameters):
    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 UsableChanges(Changes):
    pass


class ReportableChanges(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(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 = UsableChanges(params=changed)
            return True
        return False

    def module_provisioned(self, module):
        resource = self.client.api.tm.sys.dbs.db.load(
            name='provisioned.cpu.{0}'.format(module)
        )
        if int(resource.value) == 0:
            return False
        return True

    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.client.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.tm.net.service_policys.service_policy.exists(
            name=self.want.name,
            partition=self.want.partition
        )
        return result

    def update(self):
        self.have = self.read_current_from_device()
        if not self.should_update():
            return False
        if self.want.port_misuse_policy:
            if not self.module_provisioned('afm'):
                raise F5ModuleError(
                    "To configure a 'port_misuse_policy', you must have AFM provisioned."
                )
        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.want.port_misuse_policy:
            if not self.module_provisioned('afm'):
                raise F5ModuleError(
                    "To configure a 'port_misuse_policy', you must have AFM provisioned."
                )
        if self.module.check_mode:
            return True
        self.create_on_device()
        return True

    def create_on_device(self):
        params = self.changes.api_params()
        self.client.api.tm.net.service_policys.service_policy.create(
            name=self.want.name,
            partition=self.want.partition,
            **params
        )

    def update_on_device(self):
        params = self.changes.api_params()
        resource = self.client.api.tm.net.service_policys.service_policy.load(
            name=self.want.name,
            partition=self.want.partition
        )
        resource.modify(**params)

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

    def remove_from_device(self):
        resource = self.client.api.tm.net.service_policys.service_policy.load(
            name=self.want.name,
            partition=self.want.partition
        )
        if resource:
            resource.delete()

    def read_current_from_device(self):
        resource = self.client.api.tm.net.service_policys.service_policy.load(
            name=self.want.name,
            partition=self.want.partition
        )
        result = resource.attrs
        return ApiParameters(params=result)


class ArgumentSpec(object):
    def __init__(self):
        self.supports_check_mode = True
        argument_spec = dict(
            name=dict(),
            description=dict(),
            timer_policy=dict(),
            port_misuse_policy=dict(),
            state=dict(
                default='present',
                choices=['absent', 'present']
            ),
            partition=dict(
                default='Common',
                fallback=(env_fallback, ['F5_PARTITION'])
            )
        )
        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()
        cleanup_tokens(client)
        module.exit_json(**results)
    except F5ModuleError as ex:
        cleanup_tokens(client)
        module.fail_json(msg=str(ex))


if __name__ == '__main__':
    main()