#!/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_partition
short_description: Manage BIG-IP partitions
description:
  - Manage partitions on the BIG-IP.
version_added: "1.0.0"
options:
  name:
    description:
      - Name of the partition.
    type: str
    required: True
  description:
    description:
      - The description to attach to the partition.
    type: str
  route_domain:
    description:
      - The default Route Domain to assign to the partition. If no route domain
        is specified, the default route domain for the system (typically
        zero) will be used only when creating a new partition.
    type: int
  state:
    description:
      - Whether the partition should exist or not.
    type: str
    choices:
      - present
      - absent
    default: present
notes:
  - Requires BIG-IP software version >= 12
extends_documentation_fragment: f5networks.f5_modules.f5
author:
  - Tim Rupp (@caphrim007)
  - Wojciech Wypior (@wojtek0806)
'''

EXAMPLES = r'''
- name: Create partition "foo" using the default route domain
  bigip_partition:
    name: foo
    provider:
      password: secret
      server: lb.mydomain.com
      user: admin
  delegate_to: localhost

- name: Create partition "bar" using a custom route domain
  bigip_partition:
    name: bar
    route_domain: 3
    provider:
      password: secret
      server: lb.mydomain.com
      user: admin
  delegate_to: localhost

- name: Change route domain of partition "foo"
  bigip_partition:
    name: foo
    route_domain: 8
    provider:
      password: secret
      server: lb.mydomain.com
      user: admin
  delegate_to: localhost

- name: Set a description for partition "foo"
  bigip_partition:
    name: foo
    description: Tenant CompanyA
    provider:
      password: secret
      server: lb.mydomain.com
      user: admin
  delegate_to: localhost

- name: Delete the "foo" partition
  bigip_partition:
    name: foo
    state: absent
    provider:
      password: secret
      server: lb.mydomain.com
      user: admin
  delegate_to: localhost
'''

RETURN = r'''
route_domain:
  description: Name of the route domain associated with the partition.
  returned: changed and success
  type: int
  sample: 0
description:
  description: The description of the partition.
  returned: changed and success
  type: str
  sample: Example partition
'''
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.compare import cmp_str_with_none
from ..module_utils.icontrol import tmos_version
from ..module_utils.teem import send_teem


class Parameters(AnsibleF5Parameters):
    api_map = {
        'defaultRouteDomain': 'route_domain',
    }

    api_attributes = [
        'description',
        'defaultRouteDomain',
    ]

    returnables = [
        'description',
        'route_domain',
        'folder_description',
    ]

    updatables = [
        'description',
        'route_domain',
        'folder_description',
    ]


class ApiParameters(Parameters):
    @property
    def description(self):
        if self._values['description'] in [None, 'none']:
            return None
        return self._values['description']


class ModuleParameters(Parameters):
    @property
    def partition(self):
        # Cannot create a partition in a partition, so nullify this
        return None

    @property
    def route_domain(self):
        if self._values['route_domain'] is None:
            return None
        return int(self._values['route_domain'])

    @property
    def description(self):
        if self._values['description'] is None:
            return None
        elif self._values['description'] in ['none', '']:
            return ''
        return self._values['description']


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:
            result = self.__default(param)
            return result

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

    @property
    def description(self):
        if cmp_str_with_none(self.want.description, self.have.description) is None:
            return cmp_str_with_none(self.want.description, self.have.folder_description)
        else:
            return self.want.description


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

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

    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 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.client, self.module, version)
        return result

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

    def create(self):
        self._set_changed_options()
        if self.module.check_mode:
            return True
        self.create_on_device()
        if self.changes.description:
            self.update_folder_on_device()
        if not self.exists():
            raise F5ModuleError("Failed to create the partition.")
        return True

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

    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()
        if self.changes.description:
            self.update_folder_on_device()
        return True

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

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

    def read_current_from_device(self):
        uri = "https://{0}:{1}/mgmt/tm/auth/partition/{2}".format(
            self.client.provider['server'],
            self.client.provider['server_port'],
            self.want.name
        )
        resp = self.client.api.get(uri)
        try:
            response = resp.json()
        except ValueError as ex:
            raise F5ModuleError(str(ex))

        if 'code' in response and response['code'] == 400:
            if 'message' in response:
                raise F5ModuleError(response['message'])
            else:
                raise F5ModuleError(resp.content)
        result = ApiParameters(params=response)
        uri = "https://{0}:{1}/mgmt/tm/sys/folder/~{2}".format(
            self.client.provider['server'],
            self.client.provider['server_port'],
            self.want.name
        )
        resp = self.client.api.get(uri)
        try:
            response = resp.json()
        except ValueError as ex:
            raise F5ModuleError(str(ex))

        if 'code' in response and response['code'] == 400:
            if 'message' in response:
                raise F5ModuleError(response['message'])
            else:
                raise F5ModuleError(resp.content)
        result.update({'folder_description': response.get('description', None)})
        return result

    def exists(self):
        uri = "https://{0}:{1}/mgmt/tm/auth/partition/{2}".format(
            self.client.provider['server'],
            self.client.provider['server_port'],
            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

        errors = [401, 403, 409, 500, 501, 502, 503, 504]

        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
        uri = "https://{0}:{1}/mgmt/tm/auth/partition/".format(
            self.client.provider['server'],
            self.client.provider['server_port'],
        )
        resp = self.client.api.post(uri, json=params)
        try:
            response = resp.json()
        except ValueError as ex:
            raise F5ModuleError(str(ex))

        if 'code' in response and response['code'] in [400, 403, 409]:
            if 'message' in response:
                raise F5ModuleError(response['message'])
            else:
                raise F5ModuleError(resp.content)

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

        if 'code' in response and response['code'] == 400:
            if 'message' in response:
                raise F5ModuleError(response['message'])
            else:
                raise F5ModuleError(resp.content)

    def update_folder_on_device(self):
        params = dict(description=self.changes.description)
        uri = "https://{0}:{1}/mgmt/tm/sys/folder/~{2}".format(
            self.client.provider['server'],
            self.client.provider['server_port'],
            self.want.name
        )
        resp = self.client.api.patch(uri, json=params)
        try:
            response = resp.json()
        except ValueError as ex:
            raise F5ModuleError(str(ex))

        if 'code' in response and response['code'] == 400:
            if 'message' in response:
                raise F5ModuleError(response['message'])
            else:
                raise F5ModuleError(resp.content)

    def remove_from_device(self):
        uri = "https://{0}:{1}/mgmt/tm/auth/partition/{2}".format(
            self.client.provider['server'],
            self.client.provider['server_port'],
            self.want.name
        )
        resp = self.client.api.delete(uri)
        if resp.status == 200:
            return True


class ArgumentSpec(object):
    def __init__(self):
        self.supports_check_mode = True
        argument_spec = dict(
            name=dict(required=True),
            description=dict(),
            route_domain=dict(type='int'),
            state=dict(
                choices=['absent', 'present'],
                default='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()