#!/usr/bin/python

# Copyright (c) 2018 Catalyst Cloud Ltd.
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

DOCUMENTATION = '''
---
module: loadbalancer
short_description: Add/Delete load balancer from OpenStack Cloud
author: "Lingxian Kong (@lingxiankong)"
description:
  - Add or Remove load balancer from the OpenStack load-balancer
    service(Octavia). Load balancer update is not supported for now.
options:
  name:
    description:
      - Name that has to be given to the load balancer
    required: true
    type: str
  state:
    description:
      - Should the resource be present or absent.
    choices: [present, absent]
    default: present
    type: str
  vip_network:
    description:
      - The name or id of the network for the virtual IP of the load balancer.
        One of I(vip_network), I(vip_subnet), or I(vip_port) must be specified
        for creation.
    type: str
  vip_subnet:
    description:
      - The name or id of the subnet for the virtual IP of the load balancer.
        One of I(vip_network), I(vip_subnet), or I(vip_port) must be specified
        for creation.
    type: str
  vip_port:
    description:
      - The name or id of the load balancer virtual IP port. One of
        I(vip_network), I(vip_subnet), or I(vip_port) must be specified for
        creation.
    type: str
  vip_address:
    description:
      - IP address of the load balancer virtual IP.
    type: str
  public_ip_address:
    description:
      - Public IP address associated with the VIP.
    type: str
  auto_public_ip:
    description:
      - Allocate a public IP address and associate with the VIP automatically.
    type: bool
    default: 'no'
  public_network:
    description:
      - The name or ID of a Neutron external network.
    type: str
  delete_public_ip:
    description:
      - When C(state=absent) and this option is true, any public IP address
        associated with the VIP will be deleted along with the load balancer.
    type: bool
    default: 'no'
  listeners:
    description:
      - A list of listeners that attached to the load balancer.
    suboptions:
      name:
        description:
          - The listener name or ID.
      protocol:
        description:
          - The protocol for the listener.
        default: HTTP
      protocol_port:
        description:
          - The protocol port number for the listener.
        default: 80
      pool:
        description:
          - The pool attached to the listener.
        suboptions:
          name:
            description:
              - The pool name or ID.
          protocol:
            description:
              - The protocol for the pool.
            default: HTTP
          lb_algorithm:
            description:
              - The load balancing algorithm for the pool.
            default: ROUND_ROBIN
          members:
            description:
              - A list of members that added to the pool.
            suboptions:
              name:
                description:
                  - The member name or ID.
              address:
                description:
                  - The IP address of the member.
              protocol_port:
                description:
                  - The protocol port number for the member.
                default: 80
              subnet:
                description:
                  - The name or ID of the subnet the member service is
                    accessible from.
    elements: dict
    type: list
  wait:
    description:
      - If the module should wait for the load balancer to be created or
        deleted.
    type: bool
    default: 'yes'
  timeout:
    description:
      - The amount of time the module should wait.
    default: 180
    type: int
requirements:
    - "python >= 3.6"
    - "openstacksdk"

extends_documentation_fragment:
- openstack.cloud.openstack
'''

RETURN = '''
id:
    description: The load balancer UUID.
    returned: On success when C(state=present)
    type: str
    sample: "39007a7e-ee4f-4d13-8283-b4da2e037c69"
loadbalancer:
    description: Dictionary describing the load balancer.
    returned: On success when C(state=present)
    type: complex
    contains:
        id:
            description: Unique UUID.
            type: str
            sample: "39007a7e-ee4f-4d13-8283-b4da2e037c69"
        name:
            description: Name given to the load balancer.
            type: str
            sample: "lingxian_test"
        vip_network_id:
            description: Network ID the load balancer virtual IP port belongs in.
            type: str
            sample: "f171db43-56fd-41cf-82d7-4e91d741762e"
        vip_subnet_id:
            description: Subnet ID the load balancer virtual IP port belongs in.
            type: str
            sample: "c53e3c70-9d62-409a-9f71-db148e7aa853"
        vip_port_id:
            description: The load balancer virtual IP port ID.
            type: str
            sample: "2061395c-1c01-47ab-b925-c91b93df9c1d"
        vip_address:
            description: The load balancer virtual IP address.
            type: str
            sample: "192.168.2.88"
        public_vip_address:
            description: The load balancer public VIP address.
            type: str
            sample: "10.17.8.254"
        provisioning_status:
            description: The provisioning status of the load balancer.
            type: str
            sample: "ACTIVE"
        operating_status:
            description: The operating status of the load balancer.
            type: str
            sample: "ONLINE"
        is_admin_state_up:
            description: The administrative state of the load balancer.
            type: bool
            sample: true
        listeners:
            description: The associated listener IDs, if any.
            type: list
            sample: [{"id": "7aa1b380-beec-459c-a8a7-3a4fb6d30645"}, {"id": "692d06b8-c4f8-4bdb-b2a3-5a263cc23ba6"}]
        pools:
            description: The associated pool IDs, if any.
            type: list
            sample: [{"id": "27b78d92-cee1-4646-b831-e3b90a7fa714"}, {"id": "befc1fb5-1992-4697-bdb9-eee330989344"}]
'''

EXAMPLES = '''
# Create a load balancer by specifying the VIP subnet.
- openstack.cloud.loadbalancer:
    auth:
      auth_url: https://identity.example.com
      username: admin
      password: passme
      project_name: admin
    state: present
    name: my_lb
    vip_subnet: my_subnet
    timeout: 150

# Create a load balancer by specifying the VIP network and the IP address.
- openstack.cloud.loadbalancer:
    auth:
      auth_url: https://identity.example.com
      username: admin
      password: passme
      project_name: admin
    state: present
    name: my_lb
    vip_network: my_network
    vip_address: 192.168.0.11

# Create a load balancer together with its sub-resources in the 'all in one'
# way. A public IP address is also allocated to the load balancer VIP.
- openstack.cloud.loadbalancer:
    auth:
      auth_url: https://identity.example.com
      username: admin
      password: passme
      project_name: admin
    name: lingxian_test
    state: present
    vip_subnet: kong_subnet
    auto_public_ip: yes
    public_network: public
    listeners:
      - name: lingxian_80
        protocol: TCP
        protocol_port: 80
        pool:
          name: lingxian_80_pool
          protocol: TCP
          members:
            - name: mywebserver1
              address: 192.168.2.81
              protocol_port: 80
              subnet: webserver_subnet
      - name: lingxian_8080
        protocol: TCP
        protocol_port: 8080
        pool:
          name: lingxian_8080-pool
          protocol: TCP
          members:
            - name: mywebserver2
              address: 192.168.2.82
              protocol_port: 8080
    wait: yes
    timeout: 600

# Delete a load balancer(and all its related resources)
- openstack.cloud.loadbalancer:
    auth:
      auth_url: https://identity.example.com
      username: admin
      password: passme
      project_name: admin
    state: absent
    name: my_lb

# Delete a load balancer(and all its related resources) together with the
# public IP address(if any) attached to it.
- openstack.cloud.loadbalancer:
    auth:
      auth_url: https://identity.example.com
      username: admin
      password: passme
      project_name: admin
    state: absent
    name: my_lb
    delete_public_ip: yes
'''

import time

from ansible.module_utils.basic import AnsibleModule
from ansible_collections.openstack.cloud.plugins.module_utils.openstack import (openstack_full_argument_spec,
                                                                                openstack_module_kwargs,
                                                                                openstack_cloud_from_module)


def _wait_for_lb(module, cloud, lb, status, failures, interval=5):
    """Wait for load balancer to be in a particular provisioning status."""
    timeout = module.params['timeout']

    total_sleep = 0
    if failures is None:
        failures = []

    while total_sleep < timeout:
        lb = cloud.load_balancer.find_load_balancer(lb.id)

        if lb:
            if lb.provisioning_status == status:
                return None
            if lb.provisioning_status in failures:
                module.fail_json(
                    msg="Load Balancer %s transitioned to failure state %s" %
                        (lb.id, lb.provisioning_status)
                )
        else:
            if status == "DELETED":
                return None
            else:
                module.fail_json(
                    msg="Load Balancer %s transitioned to DELETED" % lb.id
                )

        time.sleep(interval)
        total_sleep += interval

    module.fail_json(
        msg="Timeout waiting for Load Balancer %s to transition to %s" %
            (lb.id, status)
    )


def main():
    argument_spec = openstack_full_argument_spec(
        name=dict(required=True),
        state=dict(default='present', choices=['absent', 'present']),
        vip_network=dict(required=False),
        vip_subnet=dict(required=False),
        vip_port=dict(required=False),
        vip_address=dict(required=False),
        listeners=dict(type='list', default=[], elements='dict'),
        public_ip_address=dict(required=False, default=None),
        auto_public_ip=dict(required=False, default=False, type='bool'),
        public_network=dict(required=False),
        delete_public_ip=dict(required=False, default=False, type='bool'),
    )
    module_kwargs = openstack_module_kwargs()
    module = AnsibleModule(argument_spec, **module_kwargs)
    sdk, cloud = openstack_cloud_from_module(module)

    vip_network = module.params['vip_network']
    vip_subnet = module.params['vip_subnet']
    vip_port = module.params['vip_port']
    listeners = module.params['listeners']
    public_vip_address = module.params['public_ip_address']
    allocate_fip = module.params['auto_public_ip']
    delete_fip = module.params['delete_public_ip']
    public_network = module.params['public_network']

    vip_network_id = None
    vip_subnet_id = None
    vip_port_id = None

    try:
        changed = False
        lb = cloud.load_balancer.find_load_balancer(
            name_or_id=module.params['name'])

        if module.params['state'] == 'present':
            if not lb:
                if not (vip_network or vip_subnet or vip_port):
                    module.fail_json(
                        msg="One of vip_network, vip_subnet, or vip_port must "
                            "be specified for load balancer creation"
                    )

                if vip_network:
                    network = cloud.get_network(vip_network)
                    if not network:
                        module.fail_json(
                            msg='network %s is not found' % vip_network
                        )
                    vip_network_id = network.id
                if vip_subnet:
                    subnet = cloud.get_subnet(vip_subnet)
                    if not subnet:
                        module.fail_json(
                            msg='subnet %s is not found' % vip_subnet
                        )
                    vip_subnet_id = subnet.id
                if vip_port:
                    port = cloud.get_port(vip_port)
                    if not port:
                        module.fail_json(
                            msg='port %s is not found' % vip_port
                        )
                    vip_port_id = port.id

                lb = cloud.load_balancer.create_load_balancer(
                    name=module.params['name'],
                    vip_network_id=vip_network_id,
                    vip_subnet_id=vip_subnet_id,
                    vip_port_id=vip_port_id,
                    vip_address=module.params['vip_address'],
                )
                changed = True

            if not listeners and not module.params['wait']:
                module.exit_json(
                    changed=changed,
                    loadbalancer=lb.to_dict(),
                    id=lb.id
                )

            _wait_for_lb(module, cloud, lb, "ACTIVE", ["ERROR"])

            for listener_def in listeners:
                listener_name = listener_def.get("name")
                pool_def = listener_def.get("pool")

                if not listener_name:
                    module.fail_json(msg='listener name is required')

                listener = cloud.load_balancer.find_listener(
                    name_or_id=listener_name
                )

                if not listener:
                    _wait_for_lb(module, cloud, lb, "ACTIVE", ["ERROR"])

                    protocol = listener_def.get("protocol", "HTTP")
                    protocol_port = listener_def.get("protocol_port", 80)

                    listener = cloud.load_balancer.create_listener(
                        name=listener_name,
                        loadbalancer_id=lb.id,
                        protocol=protocol,
                        protocol_port=protocol_port,
                    )
                    changed = True

                # Ensure pool in the listener.
                if pool_def:
                    pool_name = pool_def.get("name")
                    members = pool_def.get('members', [])

                    if not pool_name:
                        module.fail_json(msg='pool name is required')

                    pool = cloud.load_balancer.find_pool(name_or_id=pool_name)

                    if not pool:
                        _wait_for_lb(module, cloud, lb, "ACTIVE", ["ERROR"])

                        protocol = pool_def.get("protocol", "HTTP")
                        lb_algorithm = pool_def.get("lb_algorithm",
                                                    "ROUND_ROBIN")

                        pool = cloud.load_balancer.create_pool(
                            name=pool_name,
                            listener_id=listener.id,
                            protocol=protocol,
                            lb_algorithm=lb_algorithm
                        )
                        changed = True

                    # Ensure members in the pool
                    for member_def in members:
                        member_name = member_def.get("name")
                        if not member_name:
                            module.fail_json(msg='member name is required')

                        member = cloud.load_balancer.find_member(member_name,
                                                                 pool.id)

                        if not member:
                            _wait_for_lb(module, cloud, lb, "ACTIVE",
                                         ["ERROR"])

                            address = member_def.get("address")
                            if not address:
                                module.fail_json(
                                    msg='member address for member %s is '
                                        'required' % member_name
                                )

                            subnet_id = member_def.get("subnet")
                            if subnet_id:
                                subnet = cloud.get_subnet(subnet_id)
                                if not subnet:
                                    module.fail_json(
                                        msg='subnet %s for member %s is not '
                                            'found' % (subnet_id, member_name)
                                    )
                                subnet_id = subnet.id

                            protocol_port = member_def.get("protocol_port", 80)

                            member = cloud.load_balancer.create_member(
                                pool,
                                name=member_name,
                                address=address,
                                protocol_port=protocol_port,
                                subnet_id=subnet_id
                            )
                            changed = True

            # Associate public ip to the load balancer VIP. If
            # public_vip_address is provided, use that IP, otherwise, either
            # find an available public ip or create a new one.
            fip = None
            orig_public_ip = None
            new_public_ip = None
            if public_vip_address or allocate_fip:
                ips = cloud.network.ips(
                    port_id=lb.vip_port_id,
                    fixed_ip_address=lb.vip_address
                )
                ips = list(ips)
                if ips:
                    orig_public_ip = ips[0]
                    new_public_ip = orig_public_ip.floating_ip_address

            if public_vip_address and public_vip_address != orig_public_ip:
                fip = cloud.network.find_ip(public_vip_address)
                if not fip:
                    module.fail_json(
                        msg='Public IP %s is unavailable' % public_vip_address
                    )

                # Release origin public ip first
                cloud.network.update_ip(
                    orig_public_ip,
                    fixed_ip_address=None,
                    port_id=None
                )

                # Associate new public ip
                cloud.network.update_ip(
                    fip,
                    fixed_ip_address=lb.vip_address,
                    port_id=lb.vip_port_id
                )

                new_public_ip = public_vip_address
                changed = True
            elif allocate_fip and not orig_public_ip:
                fip = cloud.network.find_available_ip()
                if not fip:
                    if not public_network:
                        module.fail_json(msg="Public network is not provided")

                    pub_net = cloud.network.find_network(public_network)
                    if not pub_net:
                        module.fail_json(
                            msg='Public network %s not found' %
                                public_network
                        )
                    fip = cloud.network.create_ip(
                        floating_network_id=pub_net.id
                    )

                cloud.network.update_ip(
                    fip,
                    fixed_ip_address=lb.vip_address,
                    port_id=lb.vip_port_id
                )

                new_public_ip = fip.floating_ip_address
                changed = True

            # Include public_vip_address in the result.
            lb = cloud.load_balancer.find_load_balancer(name_or_id=lb.id)
            lb_dict = lb.to_dict()
            lb_dict.update({"public_vip_address": new_public_ip})

            module.exit_json(
                changed=changed,
                loadbalancer=lb_dict,
                id=lb.id
            )
        elif module.params['state'] == 'absent':
            changed = False
            public_vip_address = None

            if lb:
                if delete_fip:
                    ips = cloud.network.ips(
                        port_id=lb.vip_port_id,
                        fixed_ip_address=lb.vip_address
                    )
                    ips = list(ips)
                    if ips:
                        public_vip_address = ips[0]

                # Deleting load balancer with `cascade=False` does not make
                # sense because the deletion will always fail if there are
                # sub-resources.
                cloud.load_balancer.delete_load_balancer(lb, cascade=True)
                changed = True

                if module.params['wait']:
                    _wait_for_lb(module, cloud, lb, "DELETED", ["ERROR"])

            if delete_fip and public_vip_address:
                cloud.network.delete_ip(public_vip_address)
                changed = True

            module.exit_json(changed=changed)
    except sdk.exceptions.OpenStackCloudException as e:
        module.fail_json(msg=str(e), extra_data=e.extra_data)


if __name__ == "__main__":
    main()