#!/usr/bin/python
# Copyright (c) 2016, Tomas Karasek <tom.to.the.k@gmail.com>
# Copyright (c) 2016, Matt Baldwin <baldwin@stackpointcloud.com>
# Copyright (c) 2016, Thibaud Morel l'Horset <teebes@gmail.com>
# GNU General Public License v3.0+ (see LICENSES/GPL-3.0-or-later.txt or https://www.gnu.org/licenses/gpl-3.0.txt)
# SPDX-License-Identifier: GPL-3.0-or-later

from __future__ import annotations


DOCUMENTATION = r"""
module: packet_device

short_description: Manage a bare metal server in the Packet Host

description:
  - Manage a bare metal server in the Packet Host (a "device" in the API terms).
  - When the machine is created it can optionally wait for public IP address, or for active state.
  - This module has a dependency on packet >= 1.0.
  - API is documented at U(https://www.packet.net/developers/api/devices).
author:
  - Tomas Karasek (@t0mk) <tom.to.the.k@gmail.com>
  - Matt Baldwin (@baldwinSPC) <baldwin@stackpointcloud.com>
  - Thibaud Morel l'Horset (@teebes) <teebes@gmail.com>

extends_documentation_fragment:
  - community.general.attributes

attributes:
  check_mode:
    support: none
  diff_mode:
    support: none

options:
  auth_token:
    description:
      - Packet API token. You can also supply it in environment variable E(PACKET_API_TOKEN).
    type: str

  count:
    description:
      - The number of devices to create. Count number can be included in hostname using the C(%d) string formatter.
    default: 1
    type: int

  count_offset:
    description:
      - From which number to start the count.
    default: 1
    type: int

  device_ids:
    description:
      - List of device IDs on which to operate.
    type: list
    elements: str

  tags:
    description:
      - List of device tags.
      - Currently implemented only for device creation.
    type: list
    elements: str
    version_added: '0.2.0'

  facility:
    description:
      - Facility slug for device creation. See Packet API for current list - U(https://www.packet.net/developers/api/facilities/).
    type: str

  features:
    description:
      - Dict with "features" for device creation. See Packet API docs for details.
    type: dict

  hostnames:
    description:
      - A hostname of a device, or a list of hostnames.
      - If given string or one-item list, you can use the C("%d") Python string format to expand numbers from O(count).
      - If only one hostname, it might be expanded to list if O(count)>1.
    aliases: [name]
    type: list
    elements: str

  locked:
    description:
      - Whether to lock a created device.
    default: false
    aliases: [lock]
    type: bool

  operating_system:
    description:
      - OS slug for device creation. See Packet API for current list - U(https://www.packet.net/developers/api/operatingsystems/).
    type: str

  plan:
    description:
      - Plan slug for device creation. See Packet API for current list - U(https://www.packet.net/developers/api/plans/).
    type: str

  project_id:
    description:
      - ID of project of the device.
    required: true
    type: str

  state:
    description:
      - Desired state of the device.
      - If set to V(present) (the default), the module call returns immediately after the device-creating HTTP request successfully
        returns.
      - If set to V(active), the module call blocks until all the specified devices are in state active due to the Packet
        API, or until O(wait_timeout).
    choices: [present, absent, active, inactive, rebooted]
    default: present
    type: str

  user_data:
    description:
      - Userdata blob made available to the machine.
    type: str

  wait_for_public_IPv:
    description:
      - Whether to wait for the instance to be assigned a public IPv4/IPv6 address.
      - If set to V(4), it waits until IPv4 is assigned to the instance.
      - If set to V(6), it waits until public IPv6 is assigned to the instance.
    choices: [4, 6]
    type: int

  wait_timeout:
    description:
      - How long (seconds) to wait either for automatic IP address assignment, or for the device to reach the V(active) state.
      - If O(wait_for_public_IPv) is set and O(state=active), the module waits for both events consequently, applying the
        timeout twice.
    default: 900
    type: int

  ipxe_script_url:
    description:
      - URL of custom iPXE script for provisioning.
      - More about custom iPXE for Packet devices at U(https://help.packet.net/technical/infrastructure/custom-ipxe).
    type: str
    default: ''

  always_pxe:
    description:
      - Persist PXE as the first boot option.
      - Normally, the PXE process happens only on the first boot. Set this arg to have your device continuously boot to iPXE.
    default: false
    type: bool


requirements:
  - "packet-python >= 1.35"
"""

EXAMPLES = r"""
# All the examples assume that you have your Packet API token in environment variable PACKET_API_TOKEN.
# You can also pass it to the auth_token parameter of the module instead.

# Creating devices

- name: Create 1 device
  hosts: localhost
  tasks:
    - community.general.packet_device:
        project_id: 89b497ee-5afc-420a-8fb5-56984898f4df
        hostnames: myserver
        tags: ci-xyz
        operating_system: ubuntu_16_04
        plan: baremetal_0
        facility: sjc1

# Create the same device and wait until it is in state "active", (when it is
# ready for other API operations). Fail if the device is not "active" in
# 10 minutes.

- name: Create device and wait up to 10 minutes for active state
  hosts: localhost
  tasks:
    - community.general.packet_device:
        project_id: 89b497ee-5afc-420a-8fb5-56984898f4df
        hostnames: myserver
        operating_system: ubuntu_16_04
        plan: baremetal_0
        facility: sjc1
        state: active
        wait_timeout: 600

- name: Create 3 ubuntu devices called server-01, server-02 and server-03
  hosts: localhost
  tasks:
    - community.general.packet_device:
        project_id: 89b497ee-5afc-420a-8fb5-56984898f4df
        hostnames: server-%02d
        count: 3
        operating_system: ubuntu_16_04
        plan: baremetal_0
        facility: sjc1

- name: Create 3 coreos devices with userdata, wait until they get IPs and then wait for SSH
  hosts: localhost
  tasks:
    - name: Create 3 devices and register their facts
      community.general.packet_device:
        hostnames: [coreos-one, coreos-two, coreos-three]
        operating_system: coreos_stable
        plan: baremetal_0
        facility: ewr1
        locked: true
        project_id: 89b497ee-5afc-420a-8fb5-56984898f4df
        wait_for_public_IPv: 4
        user_data: |
          #cloud-config
          ssh_authorized_keys:
            - {{ lookup('file', 'my_packet_sshkey') }}
          coreos:
            etcd:
              discovery: https://discovery.etcd.io/6a28e078895c5ec737174db2419bb2f3
              addr: $private_ipv4:4001
              peer-addr: $private_ipv4:7001
            fleet:
              public-ip: $private_ipv4
            units:
              - name: etcd.service
                command: start
              - name: fleet.service
                command: start
      register: newhosts

    - name: Wait for ssh
      ansible.builtin.wait_for:
        delay: 1
        host: "{{ item.public_ipv4 }}"
        port: 22
        state: started
        timeout: 500
      with_items: "{{ newhosts.devices }}"


# Other states of devices

- name: Remove 3 devices by uuid
  hosts: localhost
  tasks:
    - community.general.packet_device:
        project_id: 89b497ee-5afc-420a-8fb5-56984898f4df
        state: absent
        device_ids:
          - 1fb4faf8-a638-4ac7-8f47-86fe514c30d8
          - 2eb4faf8-a638-4ac7-8f47-86fe514c3043
          - 6bb4faf8-a638-4ac7-8f47-86fe514c301f
"""

RETURN = r"""
devices:
  description: Information about each device that was processed.
  type: list
  sample:
    - "hostname": "my-server.com"
      "id": "2a5122b9-c323-4d5c-b53c-9ad3f54273e7"
      "public_ipv4": "147.229.15.12"
      "private-ipv4": "10.0.15.12"
      "tags": []
      "locked": false
      "state": "provisioning"
      "public_ipv6": "2604:1380:2:5200::3"
  returned: success
"""


import os
import re
import time
import uuid
import traceback

from ansible.module_utils.basic import AnsibleModule

HAS_PACKET_SDK = True
try:
    import packet
except ImportError:
    HAS_PACKET_SDK = False


NAME_RE = r"({0}|{0}{1}*{0})".format(r"[a-zA-Z0-9]", r"[a-zA-Z0-9\-]")
HOSTNAME_RE = rf"({NAME_RE}\.)*{NAME_RE}$"
MAX_DEVICES = 100

PACKET_DEVICE_STATES = (
    "queued",
    "provisioning",
    "failed",
    "powering_on",
    "active",
    "powering_off",
    "inactive",
    "rebooting",
)

PACKET_API_TOKEN_ENV_VAR = "PACKET_API_TOKEN"


ALLOWED_STATES = ["absent", "active", "inactive", "rebooted", "present"]


def serialize_device(device):
    """
    Standard representation for a device as returned by various tasks::

        {
            'id': 'device_id'
            'hostname': 'device_hostname',
            'tags': [],
            'locked': false,
            'state': 'provisioning',
            'ip_addresses': [
                {
                    "address": "147.75.194.227",
                    "address_family": 4,
                    "public": true
                },
                {
                    "address": "2604:1380:2:5200::3",
                    "address_family": 6,
                    "public": true
                },
                {
                    "address": "10.100.11.129",
                    "address_family": 4,
                    "public": false
                }
            ],
            "private_ipv4": "10.100.11.129",
            "public_ipv4": "147.75.194.227",
            "public_ipv6": "2604:1380:2:5200::3",
        }

    """
    device_data = {}
    device_data["id"] = device.id
    device_data["hostname"] = device.hostname
    device_data["tags"] = device.tags
    device_data["locked"] = device.locked
    device_data["state"] = device.state
    device_data["ip_addresses"] = [
        {
            "address": addr_data["address"],
            "address_family": addr_data["address_family"],
            "public": addr_data["public"],
        }
        for addr_data in device.ip_addresses
    ]
    # Also include each IPs as a key for easier lookup in roles.
    # Key names:
    # - public_ipv4
    # - public_ipv6
    # - private_ipv4
    # - private_ipv6 (if there is one)
    for ipdata in device_data["ip_addresses"]:
        if ipdata["public"]:
            if ipdata["address_family"] == 6:
                device_data["public_ipv6"] = ipdata["address"]
            elif ipdata["address_family"] == 4:
                device_data["public_ipv4"] = ipdata["address"]
        elif not ipdata["public"]:
            if ipdata["address_family"] == 6:
                # Packet doesn't give public ipv6 yet, but maybe one
                # day they will
                device_data["private_ipv6"] = ipdata["address"]
            elif ipdata["address_family"] == 4:
                device_data["private_ipv4"] = ipdata["address"]
    return device_data


def is_valid_hostname(hostname):
    return re.match(HOSTNAME_RE, hostname) is not None


def is_valid_uuid(myuuid):
    try:
        val = uuid.UUID(myuuid, version=4)
    except ValueError:
        return False
    return str(val) == myuuid


def listify_string_name_or_id(s):
    if "," in s:
        return s.split(",")
    else:
        return [s]


def get_hostname_list(module):
    # hostname is a list-typed param, so I guess it should return list
    # (and it does, in Ansible 2.2.1) but in order to be defensive,
    # I keep here the code to convert an eventual string to list
    hostnames = module.params.get("hostnames")
    count = module.params.get("count")
    count_offset = module.params.get("count_offset")
    if isinstance(hostnames, str):
        hostnames = listify_string_name_or_id(hostnames)
    if not isinstance(hostnames, list):
        raise Exception(f"name {hostnames} is not convertible to list")

    # at this point, hostnames is a list
    hostnames = [h.strip() for h in hostnames]

    if len(hostnames) > 1 and count > 1:
        _msg = (
            "If you set count>1, you should only specify one hostname with the %d formatter, not a list of hostnames."
        )
        raise Exception(_msg)

    if len(hostnames) == 1 and count > 0:
        hostname_spec = hostnames[0]
        count_range = range(count_offset, count_offset + count)
        if re.search(r"%\d{0,2}d", hostname_spec):
            hostnames = [hostname_spec % i for i in count_range]
        elif count > 1:
            hostnames = [f"{hostname_spec}{i:02}" for i in count_range]

    for hn in hostnames:
        if not is_valid_hostname(hn):
            raise Exception(f"Hostname '{hn}' does not seem to be valid")

    if len(hostnames) > MAX_DEVICES:
        raise Exception(f"You specified too many hostnames, max is {MAX_DEVICES}")
    return hostnames


def get_device_id_list(module):
    device_ids = module.params.get("device_ids")

    if isinstance(device_ids, str):
        device_ids = listify_string_name_or_id(device_ids)

    device_ids = [di.strip() for di in device_ids]

    for di in device_ids:
        if not is_valid_uuid(di):
            raise Exception(f"Device ID '{di}' does not seem to be valid")

    if len(device_ids) > MAX_DEVICES:
        raise Exception(f"You specified too many devices, max is {MAX_DEVICES}")
    return device_ids


def create_single_device(module, packet_conn, hostname):
    for param in ("hostnames", "operating_system", "plan"):
        if not module.params.get(param):
            raise Exception(f"{param} parameter is required for new device.")
    project_id = module.params.get("project_id")
    plan = module.params.get("plan")
    tags = module.params.get("tags")
    user_data = module.params.get("user_data")
    facility = module.params.get("facility")
    operating_system = module.params.get("operating_system")
    locked = module.params.get("locked")
    ipxe_script_url = module.params.get("ipxe_script_url")
    always_pxe = module.params.get("always_pxe")
    if operating_system != "custom_ipxe":
        for param in ("ipxe_script_url", "always_pxe"):
            if module.params.get(param):
                raise Exception(f"{param} parameter is not valid for non custom_ipxe operating_system.")

    device = packet_conn.create_device(
        project_id=project_id,
        hostname=hostname,
        tags=tags,
        plan=plan,
        facility=facility,
        operating_system=operating_system,
        userdata=user_data,
        locked=locked,
        ipxe_script_url=ipxe_script_url,
        always_pxe=always_pxe,
    )
    return device


def refresh_device_list(module, packet_conn, devices):
    device_ids = [d.id for d in devices]
    new_device_list = get_existing_devices(module, packet_conn)
    return [d for d in new_device_list if d.id in device_ids]


def wait_for_devices_active(module, packet_conn, watched_devices):
    wait_timeout = module.params.get("wait_timeout")
    wait_timeout = time.time() + wait_timeout
    refreshed = watched_devices
    while wait_timeout > time.time():
        refreshed = refresh_device_list(module, packet_conn, watched_devices)
        if all(d.state == "active" for d in refreshed):
            return refreshed
        time.sleep(5)
    timed_out_devices = [d.hostname for d in refreshed if d.state != "active"]
    raise Exception(f'Waiting for state "active" timed out for devices: {timed_out_devices}')


def wait_for_public_IPv(module, packet_conn, created_devices):
    def has_public_ip(addr_list, ip_v):
        return any(a["public"] and a["address_family"] == ip_v and a["address"] for a in addr_list)

    def all_have_public_ip(ds, ip_v):
        return all(has_public_ip(d.ip_addresses, ip_v) for d in ds)

    address_family = module.params.get("wait_for_public_IPv")

    wait_timeout = module.params.get("wait_timeout")
    wait_timeout = time.time() + wait_timeout
    while wait_timeout > time.time():
        refreshed = refresh_device_list(module, packet_conn, created_devices)
        if all_have_public_ip(refreshed, address_family):
            return refreshed
        time.sleep(5)

    raise Exception(
        f"Waiting for IPv{address_family} address timed out. Hostnames: {[d.hostname for d in created_devices]}"
    )


def get_existing_devices(module, packet_conn):
    project_id = module.params.get("project_id")
    return packet_conn.list_devices(project_id, params={"per_page": MAX_DEVICES})


def get_specified_device_identifiers(module):
    if module.params.get("device_ids"):
        device_id_list = get_device_id_list(module)
        return {"ids": device_id_list, "hostnames": []}
    elif module.params.get("hostnames"):
        hostname_list = get_hostname_list(module)
        return {"hostnames": hostname_list, "ids": []}


def act_on_devices(module, packet_conn, target_state):
    specified_identifiers = get_specified_device_identifiers(module)
    existing_devices = get_existing_devices(module, packet_conn)
    changed = False
    create_hostnames = []
    if target_state in ["present", "active", "rebooted"]:
        # states where we might create non-existing specified devices
        existing_devices_names = [ed.hostname for ed in existing_devices]
        create_hostnames = [hn for hn in specified_identifiers["hostnames"] if hn not in existing_devices_names]

    process_devices = [
        d
        for d in existing_devices
        if (d.id in specified_identifiers["ids"]) or (d.hostname in specified_identifiers["hostnames"])
    ]

    if target_state != "present":
        _absent_state_map = {}
        for s in PACKET_DEVICE_STATES:
            _absent_state_map[s] = packet.Device.delete

        state_map = {
            "absent": _absent_state_map,
            "active": {"inactive": packet.Device.power_on, "provisioning": None, "rebooting": None},
            "inactive": {"active": packet.Device.power_off},
            "rebooted": {
                "active": packet.Device.reboot,
                "inactive": packet.Device.power_on,
                "provisioning": None,
                "rebooting": None,
            },
        }

        # First do non-creation actions, it might be faster
        for d in process_devices:
            if d.state == target_state:
                continue
            if d.state in state_map[target_state]:
                api_operation = state_map[target_state].get(d.state)
                if api_operation is not None:
                    api_operation(d)
                    changed = True
            else:
                _msg = f"I don't know how to process existing device {d.hostname} from state {d.state} to state {target_state}"
                raise Exception(_msg)

    # At last create missing devices
    created_devices = []
    if create_hostnames:
        created_devices = [create_single_device(module, packet_conn, n) for n in create_hostnames]
        if module.params.get("wait_for_public_IPv"):
            created_devices = wait_for_public_IPv(module, packet_conn, created_devices)
        changed = True

    processed_devices = created_devices + process_devices
    if target_state == "active":
        processed_devices = wait_for_devices_active(module, packet_conn, processed_devices)

    return {"changed": changed, "devices": [serialize_device(d) for d in processed_devices]}


def main():
    module = AnsibleModule(
        argument_spec=dict(
            auth_token=dict(default=os.environ.get(PACKET_API_TOKEN_ENV_VAR), no_log=True),
            count=dict(type="int", default=1),
            count_offset=dict(type="int", default=1),
            device_ids=dict(type="list", elements="str"),
            facility=dict(),
            features=dict(type="dict"),
            hostnames=dict(type="list", elements="str", aliases=["name"]),
            tags=dict(type="list", elements="str"),
            locked=dict(type="bool", default=False, aliases=["lock"]),
            operating_system=dict(),
            plan=dict(),
            project_id=dict(required=True),
            state=dict(choices=ALLOWED_STATES, default="present"),
            user_data=dict(),
            wait_for_public_IPv=dict(type="int", choices=[4, 6]),
            wait_timeout=dict(type="int", default=900),
            ipxe_script_url=dict(default=""),
            always_pxe=dict(type="bool", default=False),
        ),
        required_one_of=[
            (
                "device_ids",
                "hostnames",
            )
        ],
        mutually_exclusive=[
            ("hostnames", "device_ids"),
            ("count", "device_ids"),
            ("count_offset", "device_ids"),
        ],
    )

    if not HAS_PACKET_SDK:
        module.fail_json(msg="packet required for this module")

    if not module.params.get("auth_token"):
        _fail_msg = f"if Packet API token is not in environment variable {PACKET_API_TOKEN_ENV_VAR}, the auth_token parameter is required"
        module.fail_json(msg=_fail_msg)

    auth_token = module.params.get("auth_token")

    packet_conn = packet.Manager(auth_token=auth_token)

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

    try:
        module.exit_json(**act_on_devices(module, packet_conn, state))
    except Exception as e:
        module.fail_json(msg=f"failed to set device state {state}, error: {e}", exception=traceback.format_exc())


if __name__ == "__main__":
    main()