#!/usr/bin/python
# -*- coding: utf-8 -*-
#
# (c) 2015, Darren Worrall <darren@iweb.co.uk>
# (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_loadbalancer_rule
short_description: Manages load balancer rules on Apache CloudStack based clouds.
description:
    - Add, update and remove load balancer rules.
version_added: '2.0'
author:
    - "Darren Worrall (@dazworrall)"
    - "René Moser (@resmo)"
options:
  name:
    description:
      - The name of the load balancer rule.
    required: true
  description:
    description:
      - The description of the load balancer rule.
    required: false
    default: null
  algorithm:
    description:
      - Load balancer algorithm
      - Required when using C(state=present).
    required: false
    choices: [ 'source', 'roundrobin', 'leastconn' ]
    default: 'source'
  private_port:
    description:
      - The private port of the private ip address/virtual machine where the network traffic will be load balanced to.
      - Required when using C(state=present).
      - Can not be changed once the rule exists due API limitation.
    required: false
    default: null
  public_port:
    description:
      - The public port from where the network traffic will be load balanced from.
      - Required when using C(state=present).
      - Can not be changed once the rule exists due API limitation.
    required: true
    default: null
  ip_address:
    description:
      - Public IP address from where the network traffic will be load balanced from.
    required: true
    aliases: [ 'public_ip' ]
  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
  cidr:
    description:
      - CIDR (full notation) to be used for firewall rule if required.
    required: false
    default: null
  protocol:
    description:
      - The protocol to be used on the load balancer
    required: false
    default: null
  project:
    description:
      - Name of the project the load balancer IP address is related to.
    required: false
    default: null
  state:
    description:
      - State of the rule.
    required: true
    default: 'present'
    choices: [ 'present', 'absent' ]
  domain:
    description:
      - Domain the rule is related to.
    required: false
    default: null
  account:
    description:
      - Account the rule is related to.
    required: false
    default: null
  zone:
    description:
      - Name of the zone in which the rule shoud be created.
      - If not set, default zone is used.
    required: false
    default: null
extends_documentation_fragment: cloudstack
'''

EXAMPLES = '''
# Create a load balancer rule
- local_action:
    module: cs_loadbalancer_rule
    name: balance_http
    public_ip: 1.2.3.4
    algorithm: leastconn
    public_port: 80
    private_port: 8080

# update algorithm of an existing load balancer rule
- local_action:
    module: cs_loadbalancer_rule
    name: balance_http
    public_ip: 1.2.3.4
    algorithm: roundrobin
    public_port: 80
    private_port: 8080

# Delete a load balancer rule
- local_action:
    module: cs_loadbalancer_rule
    name: balance_http
    public_ip: 1.2.3.4
    state: absent
'''

RETURN = '''
---
id:
  description: UUID of the rule.
  returned: success
  type: string
  sample: a6f7a5fc-43f8-11e5-a151-feff819cdc9f
zone:
  description: Name of zone the rule is related to.
  returned: success
  type: string
  sample: ch-gva-2
project:
  description: Name of project the rule is related to.
  returned: success
  type: string
  sample: Production
account:
  description: Account the rule is related to.
  returned: success
  type: string
  sample: example account
domain:
  description: Domain the rule is related to.
  returned: success
  type: string
  sample: example domain
algorithm:
  description: Load balancer algorithm used.
  returned: success
  type: string
  sample: "source"
cidr:
  description: CIDR to forward traffic from.
  returned: success
  type: string
  sample: ""
name:
  description: Name of the rule.
  returned: success
  type: string
  sample: "http-lb"
description:
  description: Description of the rule.
  returned: success
  type: string
  sample: "http load balancer rule"
protocol:
  description: Protocol of the rule.
  returned: success
  type: string
  sample: "tcp"
public_port:
  description: Public port.
  returned: success
  type: string
  sample: 80
private_port:
  description: Private IP address.
  returned: success
  type: string
  sample: 80
public_ip:
  description: Public IP address.
  returned: success
  type: string
  sample: "1.2.3.4"
tags:
  description: List of resource tags associated with the rule.
  returned: success
  type: dict
  sample: '[ { "key": "foo", "value": "bar" } ]'
state:
  description: State of the rule.
  returned: success
  type: string
  sample: "Add"
'''

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 AnsibleCloudStackLBRule(AnsibleCloudStack):

    def __init__(self, module):
        super(AnsibleCloudStackLBRule, self).__init__(module)
        self.returns = {
            'publicip': 'public_ip',
            'algorithm': 'algorithm',
            'cidrlist': 'cidr',
            'protocol': 'protocol',
        }
        # these values will be casted to int
        self.returns_to_int = {
            'publicport': 'public_port',
            'privateport': 'private_port',
        }


    def get_rule(self, **kwargs):
        rules = self.cs.listLoadBalancerRules(**kwargs)
        if rules:
            return rules['loadbalancerrule'][0]


    def _get_common_args(self):
        return {
            'account': self.get_account(key='name'),
            'domainid': self.get_domain(key='id'),
            'projectid': self.get_project(key='id'),
            'zoneid': self.get_zone(key='id'),
            'publicipid': self.get_ip_address(key='id'),
            'name': self.module.params.get('name'),
        }


    def present_lb_rule(self):
        missing_params = []
        for required_params in [
            'algorithm',
            'private_port',
            'public_port',
        ]:
            if not self.module.params.get(required_params):
                missing_params.append(required_params)
        if missing_params:
            self.module.fail_json(msg="missing required arguments: %s" % ','.join(missing_params))

        args = self._get_common_args()
        rule = self.get_rule(**args)
        if rule:
            rule = self._update_lb_rule(rule)
        else:
            rule = self._create_lb_rule(rule)

        if rule:
            rule = self.ensure_tags(resource=rule, resource_type='LoadBalancer')
        return rule


    def _create_lb_rule(self, rule):
        self.result['changed'] = True
        if not self.module.check_mode:
            args = self._get_common_args()
            args['algorithm']   = self.module.params.get('algorithm')
            args['privateport'] = self.module.params.get('private_port')
            args['publicport']  = self.module.params.get('public_port')
            args['cidrlist']    = self.module.params.get('cidr')
            args['description'] = self.module.params.get('description')
            args['protocol']    = self.module.params.get('protocol')
            res = self.cs.createLoadBalancerRule(**args)
            if 'errortext' in res:
                self.module.fail_json(msg="Failed: '%s'" % res['errortext'])

            poll_async = self.module.params.get('poll_async')
            if poll_async:
                rule = self.poll_job(res, 'loadbalancer')
        return rule


    def _update_lb_rule(self, rule):
        args                = {}
        args['id']          = rule['id']
        args['algorithm']   = self.module.params.get('algorithm')
        args['description'] = self.module.params.get('description')
        if self.has_changed(args, rule):
            self.result['changed'] = True
            if not self.module.check_mode:
                res = self.cs.updateLoadBalancerRule(**args)
                if 'errortext' in res:
                    self.module.fail_json(msg="Failed: '%s'" % res['errortext'])

                poll_async = self.module.params.get('poll_async')
                if poll_async:
                    rule = self.poll_job(res, 'loadbalancer')
        return rule


    def absent_lb_rule(self):
        args = self._get_common_args()
        rule = self.get_rule(**args)
        if rule:
            self.result['changed'] = True
        if rule and not self.module.check_mode:
            res = self.cs.deleteLoadBalancerRule(id=rule['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:
                res = self._poll_job(res, 'loadbalancer')
        return rule


def main():
    argument_spec = cs_argument_spec()
    argument_spec.update(dict(
        name = dict(required=True),
        description = dict(default=None),
        algorithm = dict(choices=['source', 'roundrobin', 'leastconn'], default='source'),
        private_port = dict(type='int', default=None),
        public_port = dict(type='int', default=None),
        protocol = dict(default=None),
        state = dict(choices=['present', 'absent'], default='present'),
        ip_address = dict(required=True, aliases=['public_ip']),
        cidr = dict(default=None),
        project = dict(default=None),
        open_firewall = dict(type='bool', default=False),
        tags = dict(type='list', aliases=['tag'], default=None),
        zone = dict(default=None),
        domain = dict(default=None),
        account = 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_lb_rule = AnsibleCloudStackLBRule(module)

        state = module.params.get('state')
        if state in ['absent']:
            rule = acs_lb_rule.absent_lb_rule()
        else:
            rule = acs_lb_rule.present_lb_rule()

        result = acs_lb_rule.get_result(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()
