#!/usr/bin/python
# -*- coding: utf-8 -*-

# (c) 2015, Joseph Callen <jcallen () csc.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


ANSIBLE_METADATA = {'metadata_version': '1.1',
                    'status': ['preview'],
                    'supported_by': 'community'}


DOCUMENTATION = '''
---
module: vmware_vm_vss_dvs_migrate
short_description: Migrates a virtual machine from a standard vswitch to distributed
description:
    - Migrates a virtual machine from a standard vswitch to distributed
version_added: 2.0
author: "Joseph Callen (@jcpowermac)"
notes:
    - Tested on vSphere 5.5
requirements:
    - "python >= 2.6"
    - PyVmomi
options:
    vm_name:
        description:
            - Name of the virtual machine to migrate to a dvSwitch
        required: True
    dvportgroup_name:
        description:
            - Name of the portgroup to migrate to the virtual machine to
        required: True
extends_documentation_fragment: vmware.documentation
'''

EXAMPLES = '''
- name: Migrate VCSA to vDS
  local_action:
    module: vmware_vm_vss_dvs_migrate
    hostname: vcenter_ip_or_hostname
    username: vcenter_username
    password: vcenter_password
    vm_name: virtual_machine_name
    dvportgroup_name: distributed_portgroup_name
'''

try:
    from pyVmomi import vim, vmodl
    HAS_PYVMOMI = True
except ImportError:
    HAS_PYVMOMI = False

from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.vmware import (HAS_PYVMOMI, connect_to_api, get_all_objs,
                                         vmware_argument_spec, wait_for_task)


class VMwareVmVssDvsMigrate(object):
    def __init__(self, module):
        self.module = module
        self.content = connect_to_api(module)
        self.vm = None
        self.vm_name = module.params['vm_name']
        self.dvportgroup_name = module.params['dvportgroup_name']

    def process_state(self):
        vm_nic_states = {
            'absent': self.migrate_network_adapter_vds,
            'present': self.state_exit_unchanged,
        }

        vm_nic_states[self.check_vm_network_state()]()

    def find_dvspg_by_name(self):
        vmware_distributed_port_group = get_all_objs(self.content, [vim.dvs.DistributedVirtualPortgroup])
        for dvspg in vmware_distributed_port_group:
            if dvspg.name == self.dvportgroup_name:
                return dvspg
        return None

    def find_vm_by_name(self):
        virtual_machines = get_all_objs(self.content, [vim.VirtualMachine])
        for vm in virtual_machines:
            if vm.name == self.vm_name:
                return vm
        return None

    def migrate_network_adapter_vds(self):
        vm_configspec = vim.vm.ConfigSpec()
        nic = vim.vm.device.VirtualEthernetCard.DistributedVirtualPortBackingInfo()
        port = vim.dvs.PortConnection()
        devicespec = vim.vm.device.VirtualDeviceSpec()

        pg = self.find_dvspg_by_name()

        if pg is None:
            self.module.fail_json(msg="The standard portgroup was not found")

        dvswitch = pg.config.distributedVirtualSwitch
        port.switchUuid = dvswitch.uuid
        port.portgroupKey = pg.key
        nic.port = port

        for device in self.vm.config.hardware.device:
            if isinstance(device, vim.vm.device.VirtualEthernetCard):
                devicespec.device = device
                devicespec.operation = vim.vm.device.VirtualDeviceSpec.Operation.edit
                devicespec.device.backing = nic
                vm_configspec.deviceChange.append(devicespec)

        task = self.vm.ReconfigVM_Task(vm_configspec)
        changed, result = wait_for_task(task)
        self.module.exit_json(changed=changed, result=result)

    def state_exit_unchanged(self):
        self.module.exit_json(changed=False)

    def check_vm_network_state(self):
        try:
            self.vm = self.find_vm_by_name()

            if self.vm is None:
                self.module.fail_json(msg="A virtual machine with name %s does not exist" % self.vm_name)
            for device in self.vm.config.hardware.device:
                if isinstance(device, vim.vm.device.VirtualEthernetCard):
                    if isinstance(device.backing, vim.vm.device.VirtualEthernetCard.DistributedVirtualPortBackingInfo):
                        return 'present'
            return 'absent'
        except vmodl.RuntimeFault as runtime_fault:
            self.module.fail_json(msg=runtime_fault.msg)
        except vmodl.MethodFault as method_fault:
            self.module.fail_json(msg=method_fault.msg)


def main():

    argument_spec = vmware_argument_spec()
    argument_spec.update(dict(vm_name=dict(required=True, type='str'),
                              dvportgroup_name=dict(required=True, type='str')))

    module = AnsibleModule(argument_spec=argument_spec, supports_check_mode=False)
    if not HAS_PYVMOMI:
        module.fail_json(msg='pyvmomi is required for this module')

    vmware_vmnic_migrate = VMwareVmVssDvsMigrate(module)
    vmware_vmnic_migrate.process_state()


if __name__ == '__main__':
    main()
