#!/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_portforward
short_description: Manages port forwarding rules on Apache CloudStack based clouds.
description:
    - Create, update and remove port forwarding rules.
version_added: '2.0'
author: "René Moser (@resmo)"
options:
  ip_address:
    description:
      - Public IP address the rule is assigned to.
    required: true
  vm:
    description:
      - Name of virtual machine which we make the port forwarding rule for.
      - Required if C(state=present).
    required: false
    default: null
  state:
    description:
      - State of the port forwarding rule.
    required: false
    default: 'present'
    choices: [ 'present', 'absent' ]
  protocol:
    description:
      - Protocol of the port forwarding rule.
    required: false
    default: 'tcp'
    choices: [ 'tcp', 'udp' ]
  public_port:
    description:
      - Start public port for this rule.
    required: true
  public_end_port:
    description:
      - End public port for this rule.
      - If not specified equal C(public_port).
    required: false
    default: null
  private_port:
    description:
      - Start private port for this rule.
    required: true
  private_end_port:
    description:
      - End private port for this rule.
      - If not specified equal C(private_port).
    required: false
    default: null
  open_firewall:
    description:
      - Whether the firewall rule for public port should be created, while creating the new rule.
      - Use M(cs_firewall) for managing firewall rules.
    required: false
    default: false
  vm_guest_ip:
    description:
      - VM guest NIC secondary IP address for the port forwarding rule.
    required: false
    default: false
  domain:
    description:
      - Domain the C(vm) is related to.
    required: false
    default: null
  account:
    description:
      - Account the C(vm) is related to.
    required: false
    default: null
  project:
    description:
      - Name of the project the C(vm) is located in.
    required: false
    default: null
  zone:
    description:
      - Name of the zone in which the virtual machine is in.
      - If not set, default zone is used.
    required: false
    default: null
  poll_async:
    description:
      - Poll async jobs until job has finished.
    required: false
    default: true
extends_documentation_fragment: cloudstack
'''

EXAMPLES = '''
# 1.2.3.4:80 -> web01:8080
- local_action:
    module: cs_portforward
    ip_address: 1.2.3.4
    vm: web01
    public_port: 80
    private_port: 8080

# forward SSH and open firewall
- local_action:
    module: cs_portforward
    ip_address: '{{ public_ip }}'
    vm: '{{ inventory_hostname }}'
    public_port: '{{ ansible_ssh_port }}'
    private_port: 22
    open_firewall: true

# forward DNS traffic, but do not open firewall
- local_action:
    module: cs_portforward
    ip_address: 1.2.3.4
    vm: '{{ inventory_hostname }}'
    public_port: 53
    private_port: 53
    protocol: udp

# remove ssh port forwarding
- local_action:
    module: cs_portforward
    ip_address: 1.2.3.4
    public_port: 22
    private_port: 22
    state: absent
'''

RETURN = '''
---
id:
  description: UUID of the public IP address.
  returned: success
  type: string
  sample: a6f7a5fc-43f8-11e5-a151-feff819cdc9f
ip_address:
  description: Public IP address.
  returned: success
  type: string
  sample: 1.2.3.4
protocol:
  description: Protocol.
  returned: success
  type: string
  sample: tcp
private_port:
  description: Start port on the virtual machine's IP address.
  returned: success
  type: int
  sample: 80
private_end_port:
  description: End port on the virtual machine's IP address.
  returned: success
  type: int
public_port:
  description: Start port on the public IP address.
  returned: success
  type: int
  sample: 80
public_end_port:
  description: End port on the public IP address.
  returned: success
  type: int
  sample: 80
tags:
  description: Tags related to the port forwarding.
  returned: success
  type: list
  sample: []
vm_name:
  description: Name of the virtual machine.
  returned: success
  type: string
  sample: web-01
vm_display_name:
  description: Display name of the virtual machine.
  returned: success
  type: string
  sample: web-01
vm_guest_ip:
  description: IP of the virtual machine.
  returned: success
  type: string
  sample: 10.101.65.152
'''

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 AnsibleCloudStackPortforwarding(AnsibleCloudStack):

    def __init__(self, module):
        super(AnsibleCloudStackPortforwarding, self).__init__(module)
        self.returns = {
            'virtualmachinedisplayname':    'vm_display_name',
            'virtualmachinename':           'vm_name',
            'ipaddress':                    'ip_address',
            'vmguestip':                    'vm_guest_ip',
            'publicip':                     'public_ip',
            'protocol':                     'protocol',
        }
        # these values will be casted to int
        self.returns_to_int = {
            'publicport':       'public_port',
            'publicendport':    'public_end_port',
            'privateport':      'private_port',
            'privateendport':   'private_end_port',
        }
        self.portforwarding_rule = None
        self.vm_default_nic = None


    def get_vm_guest_ip(self):
        vm_guest_ip = self.module.params.get('vm_guest_ip')
        default_nic = self.get_vm_default_nic()

        if not vm_guest_ip:
            return default_nic['ipaddress']

        for secondary_ip in default_nic['secondaryip']:
            if vm_guest_ip == secondary_ip['ipaddress']:
                return vm_guest_ip
        self.module.fail_json(msg="Secondary IP '%s' not assigned to VM" % vm_guest_ip)


    def get_vm_default_nic(self):
        if self.vm_default_nic:
            return self.vm_default_nic

        nics = self.cs.listNics(virtualmachineid=self.get_vm(key='id'))
        if nics:
            for n in nics['nic']:
                if n['isdefault']:
                    self.vm_default_nic = n
                    return self.vm_default_nic
        self.module.fail_json(msg="No default IP address of VM '%s' found" % self.module.params.get('vm'))


    def get_portforwarding_rule(self):
        if not self.portforwarding_rule:
            protocol            = self.module.params.get('protocol')
            public_port         = self.module.params.get('public_port')
            public_end_port     = self.get_or_fallback('public_end_port', 'public_port')
            private_port        = self.module.params.get('private_port')
            private_end_port    = self.get_or_fallback('private_end_port', 'private_port')

            args = {}
            args['ipaddressid'] = self.get_ip_address(key='id')
            args['projectid'] = self.get_project(key='id')
            portforwarding_rules = self.cs.listPortForwardingRules(**args)

            if portforwarding_rules and 'portforwardingrule' in portforwarding_rules:
                for rule in portforwarding_rules['portforwardingrule']:
                    if protocol == rule['protocol'] \
                        and public_port == int(rule['publicport']):
                        self.portforwarding_rule = rule
                        break
        return self.portforwarding_rule


    def present_portforwarding_rule(self):
        portforwarding_rule = self.get_portforwarding_rule()
        if portforwarding_rule:
            portforwarding_rule = self.update_portforwarding_rule(portforwarding_rule)
        else:
            portforwarding_rule = self.create_portforwarding_rule()
        return portforwarding_rule


    def create_portforwarding_rule(self):
        args = {}
        args['protocol']            = self.module.params.get('protocol')
        args['publicport']          = self.module.params.get('public_port')
        args['publicendport']       = self.get_or_fallback('public_end_port', 'public_port')
        args['privateport']         = self.module.params.get('private_port')
        args['privateendport']      = self.get_or_fallback('private_end_port', 'private_port')
        args['openfirewall']        = self.module.params.get('open_firewall')
        args['vmguestip']           = self.get_vm_guest_ip()
        args['ipaddressid']         = self.get_ip_address(key='id')
        args['virtualmachineid']    = self.get_vm(key='id')

        portforwarding_rule = None
        self.result['changed'] = True
        if not self.module.check_mode:
            portforwarding_rule = self.cs.createPortForwardingRule(**args)
            poll_async = self.module.params.get('poll_async')
            if poll_async:
                portforwarding_rule = self._poll_job(portforwarding_rule, 'portforwardingrule')
        return portforwarding_rule


    def update_portforwarding_rule(self, portforwarding_rule):
        args = {}
        args['protocol']            = self.module.params.get('protocol')
        args['publicport']          = self.module.params.get('public_port')
        args['publicendport']       = self.get_or_fallback('public_end_port', 'public_port')
        args['privateport']         = self.module.params.get('private_port')
        args['privateendport']      = self.get_or_fallback('private_end_port', 'private_port')
        args['vmguestip']           = self.get_vm_guest_ip()
        args['ipaddressid']         = self.get_ip_address(key='id')
        args['virtualmachineid']    = self.get_vm(key='id')

        if self._has_changed(args, portforwarding_rule):
            self.result['changed'] = True
            if not self.module.check_mode:
                # API broken in 4.2.1?, workaround using remove/create instead of update
                # portforwarding_rule = self.cs.updatePortForwardingRule(**args)
                self.absent_portforwarding_rule()
                portforwarding_rule = self.cs.createPortForwardingRule(**args)
                poll_async = self.module.params.get('poll_async')
                if poll_async:
                    portforwarding_rule = self._poll_job(portforwarding_rule, 'portforwardingrule')
        return portforwarding_rule


    def absent_portforwarding_rule(self):
        portforwarding_rule = self.get_portforwarding_rule()

        if portforwarding_rule:
            self.result['changed'] = True
            args = {}
            args['id'] = portforwarding_rule['id']

            if not self.module.check_mode:
                res = self.cs.deletePortForwardingRule(**args)
                poll_async = self.module.params.get('poll_async')
                if poll_async:
                    self._poll_job(res, 'portforwardingrule')
        return portforwarding_rule


    def get_result(self, portforwarding_rule):
        super(AnsibleCloudStackPortforwarding, self).get_result(portforwarding_rule)
        if portforwarding_rule:
            # Bad bad API does not always return int when it should.
            for search_key, return_key in self.returns_to_int.iteritems():
                if search_key in portforwarding_rule:
                    self.result[return_key] = int(portforwarding_rule[search_key])
        return self.result


def main():
    argument_spec = cs_argument_spec()
    argument_spec.update(dict(
        ip_address = dict(required=True),
        protocol= dict(choices=['tcp', 'udp'], default='tcp'),
        public_port = dict(type='int', required=True),
        public_end_port = dict(type='int', default=None),
        private_port = dict(type='int', required=True),
        private_end_port = dict(type='int', default=None),
        state = dict(choices=['present', 'absent'], default='present'),
        open_firewall = dict(type='bool', default=False),
        vm_guest_ip = dict(default=None),
        vm = dict(default=None),
        zone = dict(default=None),
        domain = dict(default=None),
        account = dict(default=None),
        project = dict(default=None),
        poll_async = dict(type='bool', default=True),
    ))

    module = AnsibleModule(
        argument_spec=argument_spec,
        required_together=cs_required_together(),
        supports_check_mode=True
    )

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

    try:
        acs_pf = AnsibleCloudStackPortforwarding(module)
        state = module.params.get('state')
        if state in ['absent']:
            pf_rule = acs_pf.absent_portforwarding_rule()
        else:
            pf_rule = acs_pf.present_portforwarding_rule()

        result = acs_pf.get_result(pf_rule)

    except CloudStackException as 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()