#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# (c) 2015, René Moser <mail@renemoser.net>
#
# This file is part of Ansible
#
# Ansible is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# Ansible is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with Ansible. If not, see <http://www.gnu.org/licenses/>.

DOCUMENTATION = '''
---
module: cs_instance
short_description: Manages instances and virtual machines on Apache CloudStack based clouds.
description:
    - Deploy, start, update, scale, restart, stop and destroy instances.
version_added: '2.0'
author: "René Moser (@resmo)"
options:
  name:
    description:
      - Host name of the instance. C(name) can only contain ASCII letters.
    required: true
  display_name:
    description:
      - Custom display name of the instances.
    required: false
    default: null
  group:
    description:
      - Group in where the new instance should be in.
    required: false
    default: null
  state:
    description:
      - State of the instance.
    required: false
    default: 'present'
    choices: [ 'deployed', 'started', 'stopped', 'restarted', 'destroyed', 'expunged', 'present', 'absent' ]
  service_offering:
    description:
      - Name or id of the service offering of the new instance.
      - If not set, first found service offering is used.
    required: false
    default: null
  template:
    description:
      - Name or id of the template to be used for creating the new instance.
      - Required when using C(state=present).
      - Mutually exclusive with C(ISO) option.
    required: false
    default: null
  iso:
    description:
      - Name or id of the ISO to be used for creating the new instance.
      - Required when using C(state=present).
      - Mutually exclusive with C(template) option.
    required: false
    default: null
  hypervisor:
    description:
      - Name the hypervisor to be used for creating the new instance.
      - Relevant when using C(state=present), but only considered if not set on ISO/template.
      - If not set or found on ISO/template, first found hypervisor will be used.
    required: false
    default: null
    choices: [ 'KVM', 'VMware', 'BareMetal', 'XenServer', 'LXC', 'HyperV', 'UCS', 'OVM' ]
  keyboard:
    description:
      - Keyboard device type for the instance.
    required: false
    default: null
    choices: [ 'de', 'de-ch', 'es', 'fi', 'fr', 'fr-be', 'fr-ch', 'is', 'it', 'jp', 'nl-be', 'no', 'pt', 'uk', 'us' ]
  networks:
    description:
      - List of networks to use for the new instance.
    required: false
    default: []
    aliases: [ 'network' ]
  ip_address:
    description:
      - IPv4 address for default instance's network during creation.
    required: false
    default: null
  ip6_address:
    description:
      - IPv6 address for default instance's network.
    required: false
    default: null
  ip_to_networks:
    description:
      - "List of mappings in the form {'network': NetworkName, 'ip': 1.2.3.4}"
      - Mutually exclusive with C(networks) option.
    required: false
    default: null
    aliases: [ 'ip_to_network' ]
  disk_offering:
    description:
      - Name of the disk offering to be used.
    required: false
    default: null
  disk_size:
    description:
      - Disk size in GByte required if deploying instance from ISO.
    required: false
    default: null
  root_disk_size:
    description:
      - Root disk size in GByte required if deploying instance with KVM hypervisor and want resize the root disk size at startup (need CloudStack >= 4.4, cloud-initramfs-growroot installed and enabled in the template)
    required: false
    default: null
  security_groups:
    description:
      - List of security groups the instance to be applied to.
    required: false
    default: []
    aliases: [ 'security_group' ]
  domain:
    description:
      - Domain the instance is related to.
    required: false
    default: null
  account:
    description:
      - Account the instance is related to.
    required: false
    default: null
  project:
    description:
      - Name of the project the instance to be deployed in.
    required: false
    default: null
  zone:
    description:
      - Name of the zone in which the instance shoud be deployed.
      - If not set, default zone is used.
    required: false
    default: null
  ssh_key:
    description:
      - Name of the SSH key to be deployed on the new instance.
    required: false
    default: null
  affinity_groups:
    description:
      - Affinity groups names to be applied to the new instance.
    required: false
    default: []
    aliases: [ 'affinity_group' ]
  user_data:
    description:
      - Optional data (ASCII) that can be sent to the instance upon a successful deployment.
      - The data will be automatically base64 encoded.
      - Consider switching to HTTP_POST by using C(CLOUDSTACK_METHOD=post) to increase the HTTP_GET size limit of 2KB to 32 KB.
    required: false
    default: null
  force:
    description:
      - Force stop/start the instance if required to apply changes, otherwise a running instance will not be changed.
    required: false
    default: false
  tags:
    description:
      - List of tags. Tags are a list of dictionaries having keys C(key) and C(value).
      - "If you want to delete all tags, set a empty list e.g. C(tags: [])."
    required: false
    default: null
  poll_async:
    description:
      - Poll async jobs until job has finished.
    required: false
    default: true
extends_documentation_fragment: cloudstack
'''

EXAMPLES = '''
# Create a instance from an ISO
# NOTE: Names of offerings and ISOs depending on the CloudStack configuration.
- local_action:
    module: cs_instance
    name: web-vm-1
    iso: Linux Debian 7 64-bit
    hypervisor: VMware
    project: Integration
    zone: ch-zrh-ix-01
    service_offering: 1cpu_1gb
    disk_offering: PerfPlus Storage
    disk_size: 20
    networks:
      - Server Integration
      - Sync Integration
      - Storage Integration

# For changing a running instance, use the 'force' parameter
- local_action:
    module: cs_instance
    name: web-vm-1
    display_name: web-vm-01.example.com 
    iso: Linux Debian 7 64-bit
    service_offering: 2cpu_2gb
    force: yes

# Create or update a instance on Exoscale's public cloud
- local_action:
    module: cs_instance
    name: web-vm-1
    template: Linux Debian 7 64-bit
    service_offering: Tiny
    ssh_key: john@example.com
    tags:
      - { key: admin, value: john }
      - { key: foo,   value: bar }

# Create an instance with multiple interfaces specifying the IP addresses
- local_action:
    module: cs_instance
    name: web-vm-1
    template: Linux Debian 7 64-bit
    service_offering: Tiny
    ip_to_networks:
      - {'network': NetworkA, 'ip': '10.1.1.1'}
      - {'network': NetworkB, 'ip': '192.168.1.1'}

# Ensure a instance has stopped
- local_action: cs_instance name=web-vm-1 state=stopped

# Ensure a instance is running
- local_action: cs_instance name=web-vm-1 state=started

# Remove a instance
- local_action: cs_instance name=web-vm-1 state=absent
'''

RETURN = '''
---
id:
  description: UUID of the instance.
  returned: success
  type: string
  sample: 04589590-ac63-4ffc-93f5-b698b8ac38b6
name:
  description: Name of the instance.
  returned: success
  type: string
  sample: web-01
display_name:
  description: Display name of the instance.
  returned: success
  type: string
  sample: web-01
group:
  description: Group name of the instance is related.
  returned: success
  type: string
  sample: web
created:
  description: Date of the instance was created.
  returned: success
  type: string
  sample: 2014-12-01T14:57:57+0100
password_enabled:
  description: True if password setting is enabled.
  returned: success
  type: boolean
  sample: true
password:
  description: The password of the instance if exists.
  returned: success
  type: string
  sample: Ge2oe7Do
ssh_key:
  description: Name of SSH key deployed to instance.
  returned: success
  type: string
  sample: key@work
domain:
  description: Domain the instance is related to.
  returned: success
  type: string
  sample: example domain
account:
  description: Account the instance is related to.
  returned: success
  type: string
  sample: example account
project:
  description: Name of project the instance is related to.
  returned: success
  type: string
  sample: Production
default_ip:
  description: Default IP address of the instance.
  returned: success
  type: string
  sample: 10.23.37.42
public_ip:
  description: Public IP address with instance via static NAT rule.
  returned: success
  type: string
  sample: 1.2.3.4
iso:
  description: Name of ISO the instance was deployed with.
  returned: success
  type: string
  sample: Debian-8-64bit
template:
  description: Name of template the instance was deployed with.
  returned: success
  type: string
  sample: Debian-8-64bit
service_offering:
  description: Name of the service offering the instance has.
  returned: success
  type: string
  sample: 2cpu_2gb
zone:
  description: Name of zone the instance is in.
  returned: success
  type: string
  sample: ch-gva-2
state:
  description: State of the instance.
  returned: success
  type: string
  sample: Running
security_groups:
  description: Security groups the instance is in.
  returned: success
  type: list
  sample: '[ "default" ]'
affinity_groups:
  description: Affinity groups the instance is in.
  returned: success
  type: list
  sample: '[ "webservers" ]'
tags:
  description: List of resource tags associated with the instance.
  returned: success
  type: dict
  sample: '[ { "key": "foo", "value": "bar" } ]'
hypervisor:
  description: Hypervisor related to this instance.
  returned: success
  type: string
  sample: KVM
instance_name:
  description: Internal name of the instance (ROOT admin only).
  returned: success
  type: string
  sample: i-44-3992-VM
'''

import base64

try:
    from cs import CloudStack, CloudStackException, read_config
    has_lib_cs = True
except ImportError:
    has_lib_cs = False

# import cloudstack common
from ansible.module_utils.cloudstack import *


class AnsibleCloudStackInstance(AnsibleCloudStack):

    def __init__(self, module):
        super(AnsibleCloudStackInstance, self).__init__(module)
        self.returns = {
            'group':                'group',
            'hypervisor':           'hypervisor',
            'instancename':         'instance_name',
            'publicip':             'public_ip',
            'passwordenabled':      'password_enabled',
            'password':             'password',
            'serviceofferingname':  'service_offering',
            'isoname':              'iso',
            'templatename':         'template',
            'keypair':              'ssh_key',
            'securitygroup':        'security_group',
        }
        self.instance = None
        self.template = None
        self.iso = None


    def get_service_offering_id(self):
        service_offering = self.module.params.get('service_offering')

        service_offerings = self.cs.listServiceOfferings()
        if service_offerings:
            if not service_offering:
                return service_offerings['serviceoffering'][0]['id']

            for s in service_offerings['serviceoffering']:
                if service_offering in [ s['name'], s['id'] ]:
                    return s['id']
        self.module.fail_json(msg="Service offering '%s' not found" % service_offering)


    def get_template_or_iso(self, key=None):
        template = self.module.params.get('template')
        iso = self.module.params.get('iso')

        if not template and not iso:
            self.module.fail_json(msg="Template or ISO is required.")

        args                = {}
        args['account']     = self.get_account(key='name')
        args['domainid']    = self.get_domain(key='id')
        args['projectid']   = self.get_project(key='id')
        args['zoneid']      = self.get_zone(key='id')
        args['isrecursive'] = True

        if template:
            if self.template:
                return self._get_by_key(key, self.template)

            args['templatefilter'] = 'executable'
            templates = self.cs.listTemplates(**args)
            if templates:
                for t in templates['template']:
                    if template in [ t['displaytext'], t['name'], t['id'] ]:
                        self.template = t
                        return self._get_by_key(key, self.template)
            self.module.fail_json(msg="Template '%s' not found" % template)

        elif iso:
            if self.iso:
                return self._get_by_key(key, self.iso)
            args['isofilter'] = 'executable'
            isos = self.cs.listIsos(**args)
            if isos:
                for i in isos['iso']:
                    if iso in [ i['displaytext'], i['name'], i['id'] ]:
                        self.iso = i
                        return self._get_by_key(key, self.iso)
            self.module.fail_json(msg="ISO '%s' not found" % iso)


    def get_disk_offering_id(self):
        disk_offering = self.module.params.get('disk_offering')

        if not disk_offering:
            return None

        disk_offerings = self.cs.listDiskOfferings()
        if disk_offerings:
            for d in disk_offerings['diskoffering']:
                if disk_offering in [ d['displaytext'], d['name'], d['id'] ]:
                    return d['id']
        self.module.fail_json(msg="Disk offering '%s' not found" % disk_offering)


    def get_instance(self):
        instance = self.instance
        if not instance:
            instance_name = self.module.params.get('name')

            args                = {}
            args['account']     = self.get_account(key='name')
            args['domainid']    = self.get_domain(key='id')
            args['projectid']   = self.get_project(key='id')
            # Do not pass zoneid, as the instance name must be unique across zones.
            instances = self.cs.listVirtualMachines(**args)
            if instances:
                for v in instances['virtualmachine']:
                    if instance_name in [ v['name'], v['displayname'], v['id'] ]:
                        self.instance = v
                        break
        return self.instance

    def get_iptonetwork_mappings(self):
        network_mappings = self.module.params.get('ip_to_networks')
        if network_mappings is None:
            return

        if network_mappings and self.module.params.get('networks'):
            self.module.fail_json(msg="networks and ip_to_networks are mutually exclusive.")

        network_names = [n['network'] for n in network_mappings]
        ids = self.get_network_ids(network_names)
        res = []
        for i, data in enumerate(network_mappings):
            res.append({'networkid': ids[i], 'ip': data['ip']})
        return res

    def get_network_ids(self, network_names=None):
        if network_names is None:
            network_names = self.module.params.get('networks')

        if not network_names:
            return None

        args                = {}
        args['account']     = self.get_account(key='name')
        args['domainid']    = self.get_domain(key='id')
        args['projectid']   = self.get_project(key='id')
        args['zoneid']      = self.get_zone(key='id')

        networks = self.cs.listNetworks(**args)
        if not networks:
            self.module.fail_json(msg="No networks available")

        network_ids = []
        network_displaytexts = []
        for network_name in network_names:
            for n in networks['network']:
                if network_name in [ n['displaytext'], n['name'], n['id'] ]:
                    network_ids.append(n['id'])
                    network_displaytexts.append(n['name'])
                    break

        if len(network_ids) != len(network_names):
            self.module.fail_json(msg="Could not find all networks, networks list found: %s" % network_displaytexts)

        return network_ids


    def present_instance(self):
        instance = self.get_instance()
        if not instance:
            instance = self.deploy_instance()
        else:
            instance = self.update_instance(instance)

        # In check mode, we do not necessarely have an instance
        if instance:
            instance = self.ensure_tags(resource=instance, resource_type='UserVm')

        return instance


    def get_user_data(self):
        user_data = self.module.params.get('user_data')
        if user_data:
            user_data = base64.b64encode(user_data)
        return user_data


    def deploy_instance(self):
        self.result['changed'] = True
        networkids = self.get_network_ids()
        if networkids is not None:
            networkids = ','.join(networkids)

        args                        = {}
        args['templateid']          = self.get_template_or_iso(key='id')
        args['zoneid']              = self.get_zone(key='id')
        args['serviceofferingid']   = self.get_service_offering_id()
        args['account']             = self.get_account(key='name')
        args['domainid']            = self.get_domain(key='id')
        args['projectid']           = self.get_project(key='id')
        args['diskofferingid']      = self.get_disk_offering_id()
        args['networkids']          = networkids
        args['iptonetworklist']     = self.get_iptonetwork_mappings()
        args['userdata']            = self.get_user_data()
        args['keyboard']            = self.module.params.get('keyboard')
        args['ipaddress']           = self.module.params.get('ip_address')
        args['ip6address']          = self.module.params.get('ip6_address')
        args['name']                = self.module.params.get('name')
        args['displayname']         = self.get_or_fallback('display_name', 'name')
        args['group']               = self.module.params.get('group')
        args['keypair']             = self.module.params.get('ssh_key')
        args['size']                = self.module.params.get('disk_size')
        args['rootdisksize']        = self.module.params.get('root_disk_size')
        args['securitygroupnames']  = ','.join(self.module.params.get('security_groups'))
        args['affinitygroupnames']  = ','.join(self.module.params.get('affinity_groups'))

        template_iso = self.get_template_or_iso()
        if 'hypervisor' not in template_iso:
            args['hypervisor'] = self.get_hypervisor()

        instance = None
        if not self.module.check_mode:
            instance = self.cs.deployVirtualMachine(**args)

            if 'errortext' in instance:
                self.module.fail_json(msg="Failed: '%s'" % instance['errortext'])

            poll_async = self.module.params.get('poll_async')
            if poll_async:
                instance = self._poll_job(instance, 'virtualmachine')
        return instance


    def update_instance(self, instance):
        args_service_offering                       = {}
        args_service_offering['id']                 = instance['id']
        args_service_offering['serviceofferingid']  = self.get_service_offering_id()

        args_instance_update                        = {}
        args_instance_update['id']                  = instance['id']
        args_instance_update['group']               = self.module.params.get('group')
        args_instance_update['displayname']         = self.get_or_fallback('display_name', 'name')
        args_instance_update['userdata']            = self.get_user_data()
        args_instance_update['ostypeid']            = self.get_os_type(key='id')

        args_ssh_key                                = {}
        args_ssh_key['id']                          = instance['id']
        args_ssh_key['keypair']                     = self.module.params.get('ssh_key')
        args_ssh_key['projectid']                   = self.get_project(key='id')
        
        if self._has_changed(args_service_offering, instance) or \
           self._has_changed(args_instance_update, instance) or \
           self._has_changed(args_ssh_key, instance):
 
            force = self.module.params.get('force')
            instance_state = instance['state'].lower()
            
            if instance_state == 'stopped' or force:
                self.result['changed'] = True
                if not self.module.check_mode:

                    # Ensure VM has stopped
                    instance = self.stop_instance()
                    instance = self._poll_job(instance, 'virtualmachine')
                    self.instance = instance

                    # Change service offering
                    if self._has_changed(args_service_offering, instance):
                        res = self.cs.changeServiceForVirtualMachine(**args_service_offering)
                        if 'errortext' in res:
                            self.module.fail_json(msg="Failed: '%s'" % res['errortext'])
                        instance = res['virtualmachine']
                        self.instance = instance

                    # Update VM
                    if self._has_changed(args_instance_update, instance):
                        res = self.cs.updateVirtualMachine(**args_instance_update)
                        if 'errortext' in res:
                            self.module.fail_json(msg="Failed: '%s'" % res['errortext'])
                        instance = res['virtualmachine']
                        self.instance = instance

                    # Reset SSH key
                    if self._has_changed(args_ssh_key, instance):
                        instance = self.cs.resetSSHKeyForVirtualMachine(**args_ssh_key)
                        if 'errortext' in instance:
                            self.module.fail_json(msg="Failed: '%s'" % instance['errortext'])

                        instance = self._poll_job(instance, 'virtualmachine')
                        self.instance = instance

                    # Start VM again if it was running before
                    if instance_state == 'running':
                        instance = self.start_instance()
        return instance


    def absent_instance(self):
        instance = self.get_instance()
        if instance:
            if instance['state'].lower() not in ['expunging', 'destroying', 'destroyed']:
                self.result['changed'] = True
                if not self.module.check_mode:
                    res = self.cs.destroyVirtualMachine(id=instance['id'])

                    if 'errortext' in res:
                        self.module.fail_json(msg="Failed: '%s'" % res['errortext'])

                    poll_async = self.module.params.get('poll_async')
                    if poll_async:
                        instance = self._poll_job(res, 'virtualmachine')
        return instance


    def expunge_instance(self):
        instance = self.get_instance()
        if instance:
            res = {}
            if instance['state'].lower() in [ 'destroying', 'destroyed' ]:
                self.result['changed'] = True
                if not self.module.check_mode:
                    res = self.cs.destroyVirtualMachine(id=instance['id'], expunge=True)

            elif instance['state'].lower() not in [ 'expunging' ]:
                self.result['changed'] = True
                if not self.module.check_mode:
                    res = self.cs.destroyVirtualMachine(id=instance['id'], expunge=True)

            if res and 'errortext' in res:
                self.module.fail_json(msg="Failed: '%s'" % res['errortext'])

            poll_async = self.module.params.get('poll_async')
            if poll_async:
                res = self._poll_job(res, 'virtualmachine')
        return instance


    def stop_instance(self):
        instance = self.get_instance()
        if not instance:
            self.module.fail_json(msg="Instance named '%s' not found" % self.module.params.get('name'))

        if instance['state'].lower() in ['stopping', 'stopped']:
            return instance

        if instance['state'].lower() in ['starting', 'running']:
            self.result['changed'] = True
            if not self.module.check_mode:
                instance = self.cs.stopVirtualMachine(id=instance['id'])

                if 'errortext' in instance:
                    self.module.fail_json(msg="Failed: '%s'" % instance['errortext'])

                poll_async = self.module.params.get('poll_async')
                if poll_async:
                    instance = self._poll_job(instance, 'virtualmachine')
        return instance


    def start_instance(self):
        instance = self.get_instance()
        if not instance:
            self.module.fail_json(msg="Instance named '%s' not found" % module.params.get('name'))

        if instance['state'].lower() in ['starting', 'running']:
            return instance

        if instance['state'].lower() in ['stopped', 'stopping']:
            self.result['changed'] = True
            if not self.module.check_mode:
                instance = self.cs.startVirtualMachine(id=instance['id'])

                if 'errortext' in instance:
                    self.module.fail_json(msg="Failed: '%s'" % instance['errortext'])

                poll_async = self.module.params.get('poll_async')
                if poll_async:
                    instance = self._poll_job(instance, 'virtualmachine')
        return instance


    def restart_instance(self):
        instance = self.get_instance()
        if not instance:
            module.fail_json(msg="Instance named '%s' not found" % self.module.params.get('name'))

        if instance['state'].lower() in [ 'running', 'starting' ]:
            self.result['changed'] = True
            if not self.module.check_mode:
                instance = self.cs.rebootVirtualMachine(id=instance['id'])

                if 'errortext' in instance:
                    self.module.fail_json(msg="Failed: '%s'" % instance['errortext'])

                poll_async = self.module.params.get('poll_async')
                if poll_async:
                    instance = self._poll_job(instance, 'virtualmachine')

        elif instance['state'].lower() in [ 'stopping', 'stopped' ]:
            instance = self.start_instance()
        return instance


    def get_result(self, instance):
        super(AnsibleCloudStackInstance, self).get_result(instance)
        if instance:
            if 'securitygroup' in instance:
                security_groups = []
                for securitygroup in instance['securitygroup']:
                    security_groups.append(securitygroup['name'])
                self.result['security_groups'] = security_groups
            if 'affinitygroup' in instance:
                affinity_groups = []
                for affinitygroup in instance['affinitygroup']:
                    affinity_groups.append(affinitygroup['name'])
                self.result['affinity_groups'] = affinity_groups
            if 'nic' in instance:
                for nic in instance['nic']:
                    if nic['isdefault']:
                        self.result['default_ip'] = nic['ipaddress']
        return self.result

def main():
    module = AnsibleModule(
        argument_spec = dict(
            name = dict(required=True),
            display_name = dict(default=None),
            group = dict(default=None),
            state = dict(choices=['present', 'deployed', 'started', 'stopped', 'restarted', 'absent', 'destroyed', 'expunged'], default='present'),
            service_offering = dict(default=None),
            template = dict(default=None),
            iso = dict(default=None),
            networks = dict(type='list', aliases=[ 'network' ], default=None),
            ip_to_networks = dict(type='list', aliases=['ip_to_network'], default=None),
            ip_address = dict(defaul=None),
            ip6_address = dict(defaul=None),
            disk_offering = dict(default=None),
            disk_size = dict(type='int', default=None),
            root_disk_size = dict(type='int', default=None),
            keyboard = dict(choices=['de', 'de-ch', 'es', 'fi', 'fr', 'fr-be', 'fr-ch', 'is', 'it', 'jp', 'nl-be', 'no', 'pt', 'uk', 'us'], default=None),
            hypervisor = dict(choices=['KVM', 'VMware', 'BareMetal', 'XenServer', 'LXC', 'HyperV', 'UCS', 'OVM'], default=None),
            security_groups = dict(type='list', aliases=[ 'security_group' ], default=[]),
            affinity_groups = dict(type='list', aliases=[ 'affinity_group' ], default=[]),
            domain = dict(default=None),
            account = dict(default=None),
            project = dict(default=None),
            user_data = dict(default=None),
            zone = dict(default=None),
            ssh_key = dict(default=None),
            force = dict(choices=BOOLEANS, default=False),
            tags = dict(type='list', aliases=[ 'tag' ], default=None),
            poll_async = dict(choices=BOOLEANS, default=True),
            api_key = dict(default=None),
            api_secret = dict(default=None, no_log=True),
            api_url = dict(default=None),
            api_http_method = dict(choices=['get', 'post'], default='get'),
            api_timeout = dict(type='int', default=10),
        ),
        mutually_exclusive = (
            ['template', 'iso'],
        ),
        required_together = (
            ['api_key', 'api_secret', 'api_url'],
        ),
        supports_check_mode=True
    )

    if not has_lib_cs:
        module.fail_json(msg="python library cs required: pip install cs")

    try:
        acs_instance = AnsibleCloudStackInstance(module)

        state = module.params.get('state')

        if state in ['absent', 'destroyed']:
            instance = acs_instance.absent_instance()

        elif state in ['expunged']:
            instance = acs_instance.expunge_instance()

        elif state in ['present', 'deployed']:
            instance = acs_instance.present_instance()

        elif state in ['stopped']:
            instance = acs_instance.stop_instance()

        elif state in ['started']:
            instance = acs_instance.start_instance()

        elif state in ['restarted']:
            instance = acs_instance.restart_instance()

        if instance and 'state' in instance and instance['state'].lower() == 'error':
            module.fail_json(msg="Instance named '%s' in error state." % module.params.get('name'))

        result = acs_instance.get_result(instance)

    except CloudStackException, e:
        module.fail_json(msg='CloudStackException: %s' % str(e))

    module.exit_json(**result)

# import module snippets
from ansible.module_utils.basic import *
if __name__ == '__main__':
    main()