#!/usr/bin/python
#
# Copyright (c) 2019 Zim Kalinowski, <zikalino@microsoft.com>
#
# 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 = '''
---
module: azure_rm_devtestlabvirtualnetwork
version_added: "0.1.2"
short_description: Manage Azure DevTest Lab Virtual Network instance
description:
    - Create, update and delete instance of Azure DevTest Lab Virtual Network.

options:
    resource_group:
        description:
            - The name of the resource group.
        required: True
        type: str
    lab_name:
        description:
            - The name of the lab.
        required: True
        type: str
    name:
        description:
            - The name of the virtual network.
        required: True
        type: str
    location:
        description:
            - The location of the resource.
        type: str
    description:
        description:
            - The description of the virtual network.
        type: str
    state:
        description:
            - Assert the state of the Virtual Network.
            - Use C(present) to create or update an Virtual Network and C(absent) to delete it.
        type: str
        default: present
        choices:
            - absent
            - present

extends_documentation_fragment:
    - azure.azcollection.azure
    - azure.azcollection.azure_tags

author:
    - Zim Kalinowski (@zikalino)

'''

EXAMPLES = '''
- name: Create (or update) Virtual Network
  azure_rm_devtestlabvirtualnetwork:
    resource_group: myResourceGroup
    lab_name: mylab
    name: myvn
    description: My Lab Virtual Network
'''

RETURN = '''
id:
    description:
        - The identifier of the resource.
    returned: always
    type: str
    sample: "/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/resourcegroups/testrg/providers/microsoft.devtestlab/
             mylab/mylab/virtualnetworks/myvn"
external_provider_resource_id:
    description:
        - The identifier of external virtual network.
    returned: always
    type: str
    sample: "/subscriptions/xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx/resourceGroups/testrg/providers/Microsoft.Network/vi
             rtualNetworks/myvn"
'''

from ansible_collections.azure.azcollection.plugins.module_utils.azure_rm_common import AzureRMModuleBase

try:
    from azure.core.polling import LROPoller
    from azure.core.exceptions import ResourceNotFoundError
    from azure.mgmt.devtestlabs import DevTestLabsClient
except ImportError:
    # This is handled in azure_rm_common
    pass


class Actions:
    NoAction, Create, Update, Delete = range(4)


class AzureRMDevTestLabVirtualNetwork(AzureRMModuleBase):
    """Configuration class for an Azure RM Virtual Network resource"""

    def __init__(self):
        self.module_arg_spec = dict(
            resource_group=dict(
                type='str',
                required=True
            ),
            lab_name=dict(
                type='str',
                required=True
            ),
            name=dict(
                type='str',
                required=True
            ),
            location=dict(
                type='str'
            ),
            description=dict(
                type='str'
            ),
            state=dict(
                type='str',
                default='present',
                choices=['present', 'absent']
            )
        )

        self.resource_group = None
        self.lab_name = None
        self.name = None
        self.virtual_network = {}

        self.results = dict(changed=False)
        self.mgmt_client = None
        self.state = None
        self.to_do = Actions.NoAction

        super(AzureRMDevTestLabVirtualNetwork, self).__init__(derived_arg_spec=self.module_arg_spec,
                                                              supports_check_mode=True,
                                                              supports_tags=True)

    def exec_module(self, **kwargs):
        """Main module execution method"""

        for key in list(self.module_arg_spec.keys()) + ['tags']:
            if hasattr(self, key):
                setattr(self, key, kwargs[key])
            elif kwargs[key] is not None:
                self.virtual_network[key] = kwargs[key]

        response = None

        self.mgmt_client = self.get_mgmt_svc_client(DevTestLabsClient,
                                                    base_url=self._cloud_environment.endpoints.resource_manager,
                                                    api_version='2018-10-15')

        resource_group = self.get_resource_group(self.resource_group)
        if self.virtual_network.get('location') is None:
            self.virtual_network['location'] = resource_group.location

        # subnet overrides for virtual network and subnet created by default
        template = "/subscriptions/{0}/resourceGroups/{1}/providers/Microsoft.Network/virtualNetworks/{2}/subnets/{3}"
        subnet_id = template.format(self.subscription_id,
                                    self.resource_group,
                                    self.name,
                                    self.name + "Subnet")
        self.virtual_network['subnet_overrides'] = [{
            'resource_id': subnet_id,
            'lab_subnet_name': self.name + "Subnet",
            'use_in_vm_creation_permission': 'Allow',
            'use_public_ip_address_permission': 'Allow'
        }]

        old_response = self.get_virtualnetwork()

        if not old_response:
            self.log("Virtual Network instance doesn't exist")
            if self.state == 'absent':
                self.log("Old instance didn't exist")
            else:
                self.to_do = Actions.Create
        else:
            self.log("Virtual Network instance already exists")
            if self.state == 'absent':
                self.to_do = Actions.Delete
            elif self.state == 'present':
                if self.virtual_network.get('description') is not None and self.virtual_network.get('description') != old_response.get('description'):
                    self.to_do = Actions.Update

        if (self.to_do == Actions.Create) or (self.to_do == Actions.Update):
            self.log("Need to Create / Update the Virtual Network instance")
            self.results['changed'] = True
            if self.check_mode:
                return self.results
            response = self.create_update_virtualnetwork()
            self.log("Creation / Update done")
        elif self.to_do == Actions.Delete:
            self.log("Virtual Network instance deleted")
            self.results['changed'] = True
            if self.check_mode:
                return self.results
            self.delete_virtualnetwork()
            # This currently doesn't work as there is a bug in SDK / Service
            if isinstance(response, LROPoller):
                response = self.get_poller_result(response)
        else:
            self.log("Virtual Network instance unchanged")
            self.results['changed'] = False
            response = old_response

        if self.state == 'present':
            self.results.update({
                'id': response.get('id', None),
                'external_provider_resource_id': response.get('external_provider_resource_id', None)
            })
        return self.results

    def create_update_virtualnetwork(self):
        '''
        Creates or updates Virtual Network with the specified configuration.

        :return: deserialized Virtual Network instance state dictionary
        '''
        self.log("Creating / Updating the Virtual Network instance {0}".format(self.name))

        try:
            response = self.mgmt_client.virtual_networks.begin_create_or_update(resource_group_name=self.resource_group,
                                                                                lab_name=self.lab_name,
                                                                                name=self.name,
                                                                                virtual_network=self.virtual_network)
            if isinstance(response, LROPoller):
                response = self.get_poller_result(response)

        except Exception as exc:
            self.log('Error attempting to create the Virtual Network instance.')
            self.fail("Error creating the Virtual Network instance: {0}".format(str(exc)))
        return response.as_dict()

    def delete_virtualnetwork(self):
        '''
        Deletes specified Virtual Network instance in the specified subscription and resource group.

        :return: True
        '''
        self.log("Deleting the Virtual Network instance {0}".format(self.name))
        try:
            response = self.mgmt_client.virtual_networks.begin_delete(resource_group_name=self.resource_group,
                                                                      lab_name=self.lab_name,
                                                                      name=self.name)
        except Exception as e:
            self.log('Error attempting to delete the Virtual Network instance.')
            self.fail("Error deleting the Virtual Network instance: {0}".format(str(e)))

        return True

    def get_virtualnetwork(self):
        '''
        Gets the properties of the specified Virtual Network.

        :return: deserialized Virtual Network instance state dictionary
        '''
        self.log("Checking if the Virtual Network instance {0} is present".format(self.name))
        found = False
        try:
            response = self.mgmt_client.virtual_networks.get(resource_group_name=self.resource_group,
                                                             lab_name=self.lab_name,
                                                             name=self.name)
            found = True
            self.log("Response : {0}".format(response))
            self.log("Virtual Network instance : {0} found".format(response.name))
        except ResourceNotFoundError as e:
            self.log('Did not find the Virtual Network instance.')
        if found is True:
            return response.as_dict()

        return False


def main():
    """Main execution"""
    AzureRMDevTestLabVirtualNetwork()


if __name__ == '__main__':
    main()
