#!/usr/bin/python
# -*- coding: utf-8 -*-
# Copyright: (c) 2015, VMware, Inc.
# Copyright: (c) 2018, Ansible Project
# 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_maintenancemode
short_description: Place a host into maintenance mode
description:
    - This module can be used for placing a ESXi host into maintenance mode.
    - Support for VSAN compliant maintenance mode when selected.
author:
- "Jay Jahns <jjahns@vmware.com>"
- "Abhijeet Kasurde (@akasurde)"
version_added: "2.1"
notes:
    - Tested on vSphere 5.5, 6.0 and 6.5
requirements:
    - "python >= 2.6"
    - PyVmomi
options:
    esxi_hostname:
        description:
            - Name of the host as defined in vCenter.
        required: True
    vsan:
        description:
            - Specify which VSAN compliant mode to enter.
        choices:
            - 'ensureObjectAccessibility'
            - 'evacuateAllData'
            - 'noAction'
        required: False
        aliases: [ 'vsan_mode' ]
    evacuate:
        description:
            - If set to C(True), evacuate all powered off VMs.
        default: False
        required: False
        type: bool
    timeout:
        description:
            - Specify a timeout for the operation.
        required: False
        default: 0
    state:
        description:
            - Enter or exit maintenance mode.
        choices:
            - present
            - absent
        default: present
        required: False
extends_documentation_fragment: vmware.documentation
'''

EXAMPLES = '''
- name: Enter VSAN-Compliant Maintenance Mode
  vmware_maintenancemode:
    hostname: vc_host
    username: vc_user
    password: vc_pass
    esxi_hostname: esxi.host.example
    vsan: ensureObjectAccessibility
    evacuate: yes
    timeout: 3600
    state: present
'''

RETURN = '''
hostsystem:
    description: Name of vim reference
    returned: always
    type: string
    sample: "'vim.HostSystem:host-236'"
hostname:
    description: Name of host in vCenter
    returned: always
    type: string
    sample: "esxi.local.domain"
status:
    description: Action taken
    returned: always
    type: string
    sample: "ENTER"
'''

try:
    from pyVmomi import vim
except ImportError:
    pass

from ansible.module_utils.basic import AnsibleModule
from ansible.module_utils.vmware import PyVmomi, TaskError, vmware_argument_spec, wait_for_task
from ansible.module_utils._text import to_native


class VmwareMaintenanceMgr(PyVmomi):
    def __init__(self, module):
        super(VmwareMaintenanceMgr, self).__init__(module)
        self.esxi_hostname = self.module.params.get('esxi_hostname')
        self.vsan = self.module.params.get('vsan', None)
        self.host = self.find_hostsystem_by_name(host_name=self.esxi_hostname)
        if not self.host:
            self.module.fail_json(msg='Host %s not found in vCenter' % self.esxi_hostname)

    def EnterMaintenanceMode(self):
        if self.host.runtime.inMaintenanceMode:
            self.module.exit_json(changed=False,
                                  hostsystem=str(self.host),
                                  hostname=self.esxi_hostname,
                                  status='NO_ACTION',
                                  msg='Host %s already in maintenance mode' % self.esxi_hostname)

        spec = vim.host.MaintenanceSpec()

        if self.vsan:
            spec.vsanMode = vim.vsan.host.DecommissionMode()
            spec.vsanMode.objectAction = self.vsan

        try:
            task = self.host.EnterMaintenanceMode_Task(self.module.params['timeout'],
                                                       self.module.params['evacuate'],
                                                       spec)

            success, result = wait_for_task(task)

            self.module.exit_json(changed=success,
                                  hostsystem=str(self.host),
                                  hostname=self.esxi_hostname,
                                  status='ENTER',
                                  msg='Host %s entered maintenance mode' % self.esxi_hostname)

        except TaskError as e:
            self.module.fail_json(msg='Host %s failed to enter maintenance mode due to %s' % (self.esxi_hostname, to_native(e)))

    def ExitMaintenanceMode(self):
        if not self.host.runtime.inMaintenanceMode:
            self.module.exit_json(changed=False,
                                  hostsystem=str(self.host),
                                  hostname=self.esxi_hostname,
                                  status='NO_ACTION',
                                  msg='Host %s not in maintenance mode' % self.esxi_hostname)

        try:
            task = self.host.ExitMaintenanceMode_Task(self.module.params['timeout'])

            success, result = wait_for_task(task)

            self.module.exit_json(changed=success,
                                  hostsystem=str(self.host),
                                  hostname=self.esxi_hostname,
                                  status='EXIT',
                                  msg='Host %s exited maintenance mode' % self.esxi_hostname)
        except TaskError as e:
            self.module.fail_json(msg='Host %s failed to exit maintenance mode due to %s' % (self.esxi_hostname, to_native(e)))


def main():
    spec = vmware_argument_spec()
    spec.update(dict(esxi_hostname=dict(type='str', required=True),
                     vsan=dict(type='str',
                               choices=['ensureObjectAccessibility',
                                        'evacuateAllData',
                                        'noAction'],
                               aliases=['vsan_mode'],
                               ),
                     evacuate=dict(type='bool', default=False),
                     timeout=dict(default=0, type='int'),
                     state=dict(required=False, default='present', choices=['present', 'absent'])
                     )
                )

    module = AnsibleModule(argument_spec=spec)

    host_maintenance_mgr = VmwareMaintenanceMgr(module=module)

    if module.params['state'] == 'present':
        host_maintenance_mgr.EnterMaintenanceMode()
    elif module.params['state'] == 'absent':
        host_maintenance_mgr.ExitMaintenanceMode()


if __name__ == '__main__':
    main()
