""":term:`GSO` settings.

Ensuring that the required parameters are set correctly. An example file ``oss-params-example.json`` is present in the
:term:`GSO` package itself.
"""

import ipaddress
import json
import logging
import os
from pathlib import Path

from pydantic import BaseSettings, NonNegativeInt

logger = logging.getLogger(__name__)


class GeneralParams(BaseSettings):
    """General parameters for a :term:`GSO` configuration file."""

    public_hostname: str
    """The hostname that :term:`GSO` is publicly served at, used for building the callback URL that the provisioning
    proxy uses."""
    isis_high_metric: int


class CeleryParams(BaseSettings):
    """Parameters for Celery."""

    broker_url: str
    result_backend: str
    timezone: str = "Europe/Amsterdam"
    enable_utc: bool = True
    result_expires: int = 3600


class InfoBloxParams(BaseSettings):
    """Parameters related to InfoBlox."""

    scheme: str
    wapi_version: str
    host: str
    username: str
    password: str


class V4Netmask(NonNegativeInt):
    """A valid netmask for an IPv4 network or address."""

    le = 32


class V6Netmask(NonNegativeInt):
    """A valid netmask for an IPv6 network or address."""

    le = 128


class V4NetworkParams(BaseSettings):
    """A set of parameters that describe an IPv4 network in InfoBlox."""

    containers: list[ipaddress.IPv4Network]
    networks: list[ipaddress.IPv4Network]
    mask: V4Netmask


class V6NetworkParams(BaseSettings):
    """A set of parameters that describe an IPv6 network in InfoBlox."""

    containers: list[ipaddress.IPv6Network]
    networks: list[ipaddress.IPv6Network]
    mask: V6Netmask


class ServiceNetworkParams(BaseSettings):
    """Parameters for InfoBlox.

    The parameters describe IPv4 and v6 networks, and the corresponding domain name that should be used as a suffix.
    """

    V4: V4NetworkParams
    V6: V6NetworkParams
    domain_name: str
    dns_view: str
    network_view: str


class IPAMParams(BaseSettings):
    """A set of parameters related to :term:`IPAM`."""

    INFOBLOX: InfoBloxParams
    LO: ServiceNetworkParams
    TRUNK: ServiceNetworkParams
    GEANT_IP: ServiceNetworkParams
    SI: ServiceNetworkParams
    LT_IAS: ServiceNetworkParams


class MonitoringSNMPV2Params(BaseSettings):
    """Parameters related to SNMPv2."""

    community: str


class MonitoringSNMPV3Params(BaseSettings):
    """Parameters related to SNMPv3."""

    authlevel: str
    authname: str
    authpass: str
    authalgo: str
    cryptopass: str
    cryptoalgo: str


class MonitoringLibreNMSParams(BaseSettings):
    """Parameters related to LibreNMS."""

    base_url: str
    token: str


class SNMPParams(BaseSettings):
    """Parameters for SNMP in LibreNMS."""

    v2c: MonitoringSNMPV2Params
    #: .. versionadded :: 2.0
    #:    Support for :term:`SNMP` v3 will get added in a later version of :term:`GSO`. Parameters are optional for now.
    v3: MonitoringSNMPV3Params | None


class MonitoringParams(BaseSettings):
    """Parameters related to the monitoring."""

    LIBRENMS: MonitoringLibreNMSParams
    SNMP: SNMPParams


class ProvisioningProxyParams(BaseSettings):
    """Parameters for the provisioning proxy."""

    scheme: str
    api_base: str
    #:  .. deprecated:: 0.1
    #:     Not used anymore, may be left out from config file.
    auth: str | None
    api_version: int


class NetBoxParams(BaseSettings):
    """Parameters for NetBox."""

    token: str
    api: str


class EmailParams(BaseSettings):
    """Parameters for the email service."""

    # TODO: Use more strict types after we've migrated to Pydantic 2.x
    from_address: str
    smtp_host: str
    smtp_port: int
    starttls_enabled: bool
    smtp_username: str | None
    smtp_password: str | None


class OSSParams(BaseSettings):
    """The set of parameters required for running :term:`GSO`."""

    GENERAL: GeneralParams
    IPAM: IPAMParams
    NETBOX: NetBoxParams
    MONITORING: MonitoringParams
    PROVISIONING_PROXY: ProvisioningProxyParams
    CELERY: CeleryParams
    THIRD_PARTY_API_KEYS: dict[str, str]
    EMAIL: EmailParams


def load_oss_params() -> OSSParams:
    """Look for ``OSS_PARAMS_FILENAME`` in the environment and load the parameters from that file."""
    with Path(os.environ["OSS_PARAMS_FILENAME"]).open(encoding="utf-8") as file:
        return OSSParams(**json.loads(file.read()))


if __name__ == "__main__":
    logger.debug(load_oss_params())