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# Copyright (C) 2013 Craig Tracey
# Copyright (C) 2013 Hewlett-Packard Development Company, L.P.
#
# Author: Craig Tracey <craigtracey@gmail.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

"""Resolv Conf: configure resolv.conf"""

from logging import Logger
from textwrap import dedent

from cloudinit import log as logging
from cloudinit import templater, util
from cloudinit.cloud import Cloud
from cloudinit.config import Config
from cloudinit.config.schema import MetaSchema, get_meta_doc
from cloudinit.settings import PER_INSTANCE

LOG = logging.getLogger(__name__)

RESOLVE_CONFIG_TEMPLATE_MAP = {
    "/etc/resolv.conf": "resolv.conf",
    "/etc/systemd/resolved.conf": "systemd.resolved.conf",
}

MODULE_DESCRIPTION = """\
Unless manually editing :file:`/etc/resolv.conf` is the correct way to manage
nameserver information on your operating system, you do not want to use
this module. Many distros have moved away from manually editing ``resolv.conf``
so please verify that this is the preferred nameserver management method for
your distro before using this module.

Note that using :ref:`network_config` is preferred, rather than using this
module, when possible.

This module is intended to manage resolv.conf in environments where early
configuration of resolv.conf is necessary for further bootstrapping and/or
where configuration management such as puppet or chef own DNS configuration.

When using a :ref:`datasource_config_drive` and a RHEL-like system,
resolv.conf will also be managed automatically due to the available
information provided for DNS servers in the :ref:`network_config_v2` format.
For those that wish to have different settings, use this module.

In order for the ``resolv_conf`` section to be applied, ``manage_resolv_conf``
must be set ``true``.

.. note::
    For Red Hat with sysconfig, be sure to set PEERDNS=no for all DHCP
    enabled NICs.
"""

meta: MetaSchema = {
    "id": "cc_resolv_conf",
    "name": "Resolv Conf",
    "title": "Configure resolv.conf",
    "description": MODULE_DESCRIPTION,
    "distros": [
        "alpine",
        "fedora",
        "mariner",
        "opensuse",
        "opensuse-leap",
        "opensuse-microos",
        "opensuse-tumbleweed",
        "photon",
        "rhel",
        "sle_hpc",
        "sle-micro",
        "sles",
    ],
    "frequency": PER_INSTANCE,
    "examples": [
        dedent(
            """\
            manage_resolv_conf: true
            resolv_conf:
              nameservers:
                - 8.8.8.8
                - 8.8.4.4
              searchdomains:
                - foo.example.com
                - bar.example.com
              domain: example.com
              sortlist:
                - 10.0.0.1/255
                - 10.0.0.2
              options:
                rotate: true
                timeout: 1
            """
        )
    ],
    "activate_by_schema_keys": ["manage_resolv_conf"],
}

__doc__ = get_meta_doc(meta)


def generate_resolv_conf(template_fn, params, target_fname):
    flags = []
    false_flags = []

    if "options" in params:
        for key, val in params["options"].items():
            if isinstance(val, bool):
                if val:
                    flags.append(key)
                else:
                    false_flags.append(key)

    for flag in flags + false_flags:
        del params["options"][flag]

    if not params.get("options"):
        params["options"] = {}

    params["flags"] = flags
    LOG.debug("Writing resolv.conf from template %s", template_fn)
    templater.render_to_file(template_fn, target_fname, params)


def handle(
    name: str, cfg: Config, cloud: Cloud, log: Logger, args: list
) -> None:
    """
    Handler for resolv.conf

    @param name: The module name "resolv-conf" from cloud.cfg
    @param cfg: A nested dict containing the entire cloud config contents.
    @param cloud: The L{CloudInit} object in use.
    @param log: Pre-initialized Python logger object to use for logging.
    @param args: Any module arguments from cloud.cfg
    """
    if "manage_resolv_conf" not in cfg:
        log.debug(
            "Skipping module named %s,"
            " no 'manage_resolv_conf' key in configuration",
            name,
        )
        return

    if not util.get_cfg_option_bool(cfg, "manage_resolv_conf", False):
        log.debug(
            "Skipping module named %s,"
            " 'manage_resolv_conf' present but set to False",
            name,
        )
        return

    if "resolv_conf" not in cfg:
        log.warning("manage_resolv_conf True but no parameters provided!")
        return

    try:
        template_fn = cloud.get_template_filename(
            RESOLVE_CONFIG_TEMPLATE_MAP[cloud.distro.resolve_conf_fn]
        )
    except KeyError:
        log.warning("No template found, not rendering resolve configs")
        return

    generate_resolv_conf(
        template_fn=template_fn,
        params=cfg["resolv_conf"],
        target_fname=cloud.distro.resolve_conf_fn,
    )
    return


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