#!/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

DOCUMENTATION = r'''
---
module: bigip_device_group_member
short_description: Manages members in a device group
description:
  - Manages members in a device group. Members in a device group can only
    be added or removed, never updated. This is because the members are
    identified by unique name values and changing that name would invalidate
    the uniqueness.
version_added: "1.0.0"
options:
  name:
    description:
      - Specifies the name of the device that you want to add to the
        device group. Often this will be the hostname of the device.
        This member must be trusted by the device already. Trusting
        can be done with the C(bigip_device_trust) module and the
        C(peer_hostname) option to that module.
    type: str
    required: True
  device_group:
    description:
      - The device group to which you want to add the member.
    type: str
    required: True
  state:
    description:
      - When C(present), ensures the device group member exists.
      - When C(absent), ensures the device group member is removed.
    type: str
    choices:
      - present
      - absent
    default: present
extends_documentation_fragment: f5networks.f5_modules.f5
author:
  - Tim Rupp (@caphrim007)
  - Wojciech Wypior (@wojtek0806)
'''

EXAMPLES = r'''
- name: Add the current device to the "device_trust_group" device group
  bigip_device_group_member:
    name: "{{ inventory_hostname }}"
    device_group: device_trust_group
    provider:
      password: secret
      server: lb.mydomain.com
      user: admin
  delegate_to: localhost

- name: Add the hosts in the current scope to "device_trust_group"
  bigip_device_group_member:
    name: "{{ item }}"
    device_group: device_trust_group
    provider:
      password: secret
      server: lb.mydomain.com
      user: admin
  loop: "{{ hostvars.keys() }}"
  run_once: true
  delegate_to: localhost
'''

RETURN = r'''
# only common fields returned
'''
from datetime import datetime
from ansible.module_utils.basic import AnsibleModule

from ..module_utils.bigip import F5RestClient
from ..module_utils.common import (
    F5ModuleError, AnsibleF5Parameters, f5_argument_spec
)
from ..module_utils.icontrol import tmos_version
from ..module_utils.teem import send_teem


class Parameters(AnsibleF5Parameters):
    api_map = {}

    api_attributes = []

    returnables = []

    updatables = []


class ApiParameters(Parameters):
    pass


class ModuleParameters(Parameters):
    pass


class Changes(Parameters):
    def to_return(self):
        result = {}
        try:
            for returnable in self.returnables:
                change = getattr(self, returnable)
                if isinstance(change, dict):
                    result.update(change)
                else:
                    result[returnable] = change
            result = self._filter_params(result)
        except Exception:
            raise
        return result


class UsableChanges(Changes):
    pass


class ReportableChanges(Changes):
    pass


class Difference(object):
    pass


class ModuleManager(object):
    def __init__(self, *args, **kwargs):
        self.module = kwargs.get('module', None)
        self.client = F5RestClient(**self.module.params)
        self.want = Parameters(params=self.module.params)
        self.have = None
        self.changes = Changes()

    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 = Changes(params=changed)

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

    def exec_module(self):
        start = datetime.now().isoformat()
        version = tmos_version(self.client)
        changed = False
        result = dict()
        state = self.want.state

        if state == "present":
            changed = self.present()
        elif state == "absent":
            changed = self.absent()

        reportable = ReportableChanges(params=self.changes.to_return())
        changes = reportable.to_return()
        result.update(**changes)
        result.update(dict(changed=changed))
        self._announce_deprecations(result)
        send_teem(start, self.module, version)
        return result

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

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

    def create(self):
        self._set_changed_options()
        if self.module.check_mode:
            return True
        self.create_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 remove the member from the device group.")
        return True

    def exists(self):
        errors = [401, 403, 409, 500, 501, 502, 503, 504]
        uri = "https://{0}:{1}/mgmt/tm/cm/device-group/{2}/devices/{3}".format(
            self.client.provider['server'],
            self.client.provider['server_port'],
            self.want.device_group,
            self.want.name
        )
        resp = self.client.api.get(uri)
        try:
            response = resp.json()
        except ValueError as ex:
            raise F5ModuleError(str(ex))

        if resp.status == 404 or 'code' in response and response['code'] == 404:
            return False
        if resp.status in [200, 201] or 'code' in response and response['code'] in [200, 201]:
            return True

        if resp.status in errors or 'code' in response and response['code'] in errors:
            if 'message' in response:
                raise F5ModuleError(response['message'])
            else:
                raise F5ModuleError(resp.content)

    def create_on_device(self):
        params = self.changes.api_params()
        params['name'] = self.want.name
        params['partition'] = self.want.partition
        uri = "https://{0}:{1}/mgmt/tm/cm/device-group/{2}/devices/".format(
            self.client.provider['server'],
            self.client.provider['server_port'],
            self.want.device_group
        )
        resp = self.client.api.post(uri, json=params)
        try:
            response = resp.json()
        except ValueError as ex:
            raise F5ModuleError(str(ex))

        if resp.status in [200, 201] or 'code' in response and response['code'] in [200, 201]:
            return True
        raise F5ModuleError(resp.content)

    def remove_from_device(self):
        uri = "https://{0}:{1}/mgmt/tm/cm/device-group/{2}/devices/{3}".format(
            self.client.provider['server'],
            self.client.provider['server_port'],
            self.want.device_group,
            self.want.name
        )
        response = self.client.api.delete(uri)
        if response.status == 200:
            return True
        raise F5ModuleError(response.content)


class ArgumentSpec(object):
    def __init__(self):
        self.supports_check_mode = True
        argument_spec = dict(
            name=dict(required=True),
            device_group=dict(required=True),
            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
    )

    try:
        mm = ModuleManager(module=module)
        results = mm.exec_module()
        module.exit_json(**results)
    except F5ModuleError as ex:
        module.fail_json(msg=str(ex))


if __name__ == '__main__':
    main()
