# Copyright (c) 2019 Hetzner Cloud GmbH <info@hetzner-cloud.de>
# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)

DOCUMENTATION = r"""
    name: hcloud
    author:
      - Lukas Kaemmerling (@lkaemmerling)
    short_description: Ansible dynamic inventory plugin for the Hetzner Cloud.
    requirements:
      - python-dateutil >= 2.7.5
      - requests >=2.20
    description:
        - Reads inventories from the Hetzner Cloud API.
        - Uses a YAML configuration file that ends with hcloud.(yml|yaml).
    extends_documentation_fragment:
        - constructed
        - inventory_cache
    options:
        plugin:
            description: marks this as an instance of the "hcloud" plugin
            required: true
            choices: ["hcloud", "hetzner.hcloud.hcloud"]
        token:
            description: The Hetzner Cloud API Token.
            required: false
        group:
            description: The group all servers are automatically added to.
            default: hcloud
            type: str
            required: false
        token_env:
            description: Environment variable to load the Hetzner Cloud API Token from.
            default: HCLOUD_TOKEN
            type: str
            required: false
        connect_with:
            description: |
              Connect to the server using the value from this field. This sets the `ansible_host`
              variable to the value indicated, if that value is available. If you need further
              customization, like falling back to private ipv4 if the server has no public ipv4,
              you can use `compose` top-level key.
            default: public_ipv4
            type: str
            choices:
                - public_ipv4
                - public_ipv6
                - hostname
                - ipv4_dns_ptr
                - private_ipv4
        locations:
          description: Populate inventory with instances in this location.
          default: []
          type: list
          elements: str
          required: false
        types:
          description: Populate inventory with instances with this type.
          default: []
          type: list
          elements: str
          required: false
        images:
          description: Populate inventory with instances with this image name, only available for system images.
          default: []
          type: list
          elements: str
          required: false
        label_selector:
          description: Populate inventory with instances with this label.
          default: ""
          type: str
          required: false
        network:
          description: Populate inventory with instances which are attached to this network name or ID.
          default: ""
          type: str
          required: false
        status:
          description: Populate inventory with instances with this status.
          default: []
          type: list
          elements: str
          required: false
"""

EXAMPLES = r"""
plugin: hcloud
locations:
  - nbg1
types:
  - cx11
status:
  - running

# Group by a location with prefix e.g. "hcloud_location_nbg1"
# and image_os_flavor without prefix and separator e.g. "ubuntu"
# and status with prefix e.g. "server_status_running"
keyed_groups:
  - key: location
    prefix: hcloud_location
  - key: image_os_flavor
    separator: ""
  - key: status
    prefix: server_status
"""

import os
import sys
from ipaddress import IPv6Network
from typing import List, Optional, Tuple

from ansible.errors import AnsibleError
from ansible.inventory.manager import InventoryData
from ansible.module_utils.common.text.converters import to_native
from ansible.plugins.inventory import BaseInventoryPlugin, Cacheable, Constructable

from ..module_utils.hcloud import HAS_DATEUTIL, HAS_REQUESTS
from ..module_utils.vendor import hcloud
from ..module_utils.vendor.hcloud.servers import Server
from ..module_utils.version import version

if sys.version_info >= (3, 11):
    # The typed dicts are only used to help development and we prefer not requiring
    # the additional typing-extensions dependency
    from typing import NotRequired, TypedDict

    class InventoryPrivateNetwork(TypedDict):
        id: int
        name: str
        ip: str

    class InventoryServer(TypedDict):
        id: int
        name: str
        status: str
        type: str
        architecture: str

        # Datacenter
        datacenter: str
        location: str

        # Server Type
        server_type: NotRequired[str]

        # Labels
        labels: dict[str, str]

        # Network
        ipv4: NotRequired[str]
        ipv6: NotRequired[str]
        ipv6_network: NotRequired[str]
        ipv6_network_mask: NotRequired[str]
        private_ipv4: NotRequired[str]
        private_networks: list[InventoryPrivateNetwork]

        # Image
        image_id: int
        image_name: str
        image_os_flavor: str

        # Ansible
        ansible_host: str

else:
    InventoryServer = dict


class InventoryModule(BaseInventoryPlugin, Constructable, Cacheable):
    NAME = "hetzner.hcloud.hcloud"

    inventory: InventoryData

    def _configure_hcloud_client(self):
        self.token_env = self.get_option("token_env")
        self.templar.available_variables = self._vars
        self.api_token = self.templar.template(self.get_option("token"), fail_on_undefined=False) or os.getenv(
            self.token_env
        )
        if self.api_token is None:
            raise AnsibleError(
                "Please specify a token, via the option token, via environment variable HCLOUD_TOKEN "
                "or via custom environment variable set by token_env option."
            )

        self.endpoint = os.getenv("HCLOUD_ENDPOINT") or "https://api.hetzner.cloud/v1"

        self.client = hcloud.Client(
            token=self.api_token,
            api_endpoint=self.endpoint,
            application_name="ansible-inventory",
            application_version=version,
        )

    def _test_hcloud_token(self):
        try:
            # We test the API Token against the location API, because this is the API with the smallest result
            # and not controllable from the customer.
            self.client.locations.get_all()
        except hcloud.APIException:
            raise AnsibleError("Invalid Hetzner Cloud API Token.")

    def _get_servers(self):
        if len(self.get_option("label_selector")) > 0:
            self.servers = self.client.servers.get_all(label_selector=self.get_option("label_selector"))
        else:
            self.servers = self.client.servers.get_all()

    def _filter_servers(self):
        if self.get_option("network"):
            network = self.templar.template(self.get_option("network"), fail_on_undefined=False) or self.get_option(
                "network"
            )
            try:
                self.network = self.client.networks.get_by_name(network)
                if self.network is None:
                    self.network = self.client.networks.get_by_id(network)
            except hcloud.APIException:
                raise AnsibleError("The given network is not found.")

            tmp = []
            for server in self.servers:
                for server_private_network in server.private_net:
                    if server_private_network.network.id == self.network.id:
                        tmp.append(server)
            self.servers = tmp

        if self.get_option("locations"):
            tmp = []
            for server in self.servers:
                if server.datacenter.location.name in self.get_option("locations"):
                    tmp.append(server)
            self.servers = tmp

        if self.get_option("types"):
            tmp = []
            for server in self.servers:
                if server.server_type.name in self.get_option("types"):
                    tmp.append(server)
            self.servers = tmp

        if self.get_option("images"):
            tmp = []
            for server in self.servers:
                if server.image is not None and server.image.os_flavor in self.get_option("images"):
                    tmp.append(server)
            self.servers = tmp

        if self.get_option("status"):
            tmp = []
            for server in self.servers:
                if server.status in self.get_option("status"):
                    tmp.append(server)
            self.servers = tmp

    def _build_inventory_server(self, server: Server) -> InventoryServer:
        server_dict: InventoryServer = {}
        server_dict["id"] = server.id
        server_dict["name"] = to_native(server.name)
        server_dict["status"] = to_native(server.status)
        server_dict["type"] = to_native(server.server_type.name)
        server_dict["architecture"] = to_native(server.server_type.architecture)

        # Network
        if server.public_net.ipv4:
            server_dict["ipv4"] = to_native(server.public_net.ipv4.ip)

        if server.public_net.ipv6:
            server_dict["ipv6"] = to_native(self._first_ipv6_address(server.public_net.ipv6.ip))
            server_dict["ipv6_network"] = to_native(server.public_net.ipv6.network)
            server_dict["ipv6_network_mask"] = to_native(server.public_net.ipv6.network_mask)

        server_dict["private_networks"] = [
            {"id": v.network.id, "name": to_native(v.network.name), "ip": to_native(v.ip)} for v in server.private_net
        ]

        if self.get_option("network"):
            for server_private_network in server.private_net:
                # Set private_ipv4 if user filtered for one network
                if server_private_network.network.id == self.network.id:
                    server_dict["private_ipv4"] = to_native(server_private_network.ip)

        # Server Type
        if server.server_type is not None:
            server_dict["server_type"] = to_native(server.server_type.name)

        # Datacenter
        server_dict["datacenter"] = to_native(server.datacenter.name)
        server_dict["location"] = to_native(server.datacenter.location.name)

        # Image
        if server.image is not None:
            server_dict["image_id"] = server.image.id
            server_dict["image_os_flavor"] = to_native(server.image.os_flavor)
            server_dict["image_name"] = to_native(server.image.name or server.image.description)

        # Labels
        server_dict["labels"] = dict(server.labels)

        try:
            server_dict["ansible_host"] = self._get_server_ansible_host(server)
        except AnsibleError as exception:
            # Log warning that for this host can not be connected to, using the
            # method specified in `connect_with`. Users might use `compose` to
            # override the connection method, or implement custom logic, so we
            # do not need to abort if nothing matched.
            self.display.v(f"[hcloud] {exception}", server.name)

        return server_dict

    def _get_server_ansible_host(self, server):
        if self.get_option("connect_with") == "public_ipv4":
            if server.public_net.ipv4:
                return to_native(server.public_net.ipv4.ip)
            else:
                raise AnsibleError("Server has no public ipv4, but connect_with=public_ipv4 was specified")

        if self.get_option("connect_with") == "public_ipv6":
            if server.public_net.ipv6:
                return to_native(self._first_ipv6_address(server.public_net.ipv6.ip))
            else:
                raise AnsibleError("Server has no public ipv6, but connect_with=public_ipv6 was specified")

        elif self.get_option("connect_with") == "hostname":
            # every server has a name, no need to guard this
            return to_native(server.name)

        elif self.get_option("connect_with") == "ipv4_dns_ptr":
            if server.public_net.ipv4:
                return to_native(server.public_net.ipv4.dns_ptr)
            else:
                raise AnsibleError("Server has no public ipv4, but connect_with=ipv4_dns_ptr was specified")

        elif self.get_option("connect_with") == "private_ipv4":
            if self.get_option("network"):
                for server_private_network in server.private_net:
                    if server_private_network.network.id == self.network.id:
                        return to_native(server_private_network.ip)

            else:
                raise AnsibleError("You can only connect via private IPv4 if you specify a network")

    def _first_ipv6_address(self, network):
        return next(IPv6Network(network).hosts())

    def verify_file(self, path):
        """Return the possibly of a file being consumable by this plugin."""
        return super().verify_file(path) and path.endswith(("hcloud.yaml", "hcloud.yml"))

    def _get_cached_result(self, path, cache) -> Tuple[List[Optional[InventoryServer]], bool]:
        # false when refresh_cache or --flush-cache is used
        if not cache:
            return None, False

        # get the user-specified directive
        if not self.get_option("cache"):
            return None, False

        cache_key = self.get_cache_key(path)
        try:
            cached_result = self._cache[cache_key]
        except KeyError:
            # if cache expires or cache file doesn"t exist
            return None, False

        return cached_result, True

    def _update_cached_result(self, path, cache, result: List[InventoryServer]):
        if not self.get_option("cache"):
            return

        cache_key = self.get_cache_key(path)
        # We weren't explicitly told to flush the cache, and there's already a cache entry,
        # this means that the result we're being passed came from the cache.  As such we don't
        # want to "update" the cache as that could reset a TTL on the cache entry.
        if cache and cache_key in self._cache:
            return

        self._cache[cache_key] = result

    def parse(self, inventory, loader, path, cache=True):
        super().parse(inventory, loader, path, cache)

        if not HAS_REQUESTS:
            raise AnsibleError("The Hetzner Cloud dynamic inventory plugin requires requests.")
        if not HAS_DATEUTIL:
            raise AnsibleError("The Hetzner Cloud dynamic inventory plugin requires python-dateutil.")

        self._read_config_data(path)
        self._configure_hcloud_client()
        self._test_hcloud_token()

        self.servers, cached = self._get_cached_result(path, cache)
        if not cached:
            self._get_servers()
            self._filter_servers()
            self.servers = [self._build_inventory_server(server) for server in self.servers]

        # Add a top group
        self.inventory.add_group(group=self.get_option("group"))

        for server in self.servers:
            self.inventory.add_host(server["name"], group=self.get_option("group"))
            for key, value in server.items():
                self.inventory.set_variable(server["name"], key, value)

            # Use constructed if applicable
            strict = self.get_option("strict")

            # Composed variables
            self._set_composite_vars(
                self.get_option("compose"),
                self.inventory.get_host(server["name"]).get_vars(),
                server["name"],
                strict=strict,
            )

            # Complex groups based on jinja2 conditionals, hosts that meet the conditional are added to group
            self._add_host_to_composed_groups(
                self.get_option("groups"),
                {},
                server["name"],
                strict=strict,
            )

            # Create groups based on variable values and add the corresponding hosts to it
            self._add_host_to_keyed_groups(
                self.get_option("keyed_groups"),
                {},
                server["name"],
                strict=strict,
            )

        self._update_cached_result(path, cache, self.servers)