# Copyright (C) 2009-2011 Canonical Ltd.
# Copyright (C) 2012 Hewlett-Packard Development Company, L.P.
#
# Author: Marc Cluet <marc.cluet@canonical.com>
# Based on code by Scott Moser <scott.moser@canonical.com>
# Author: Juerg Haefliger <juerg.haefliger@hp.com>
#
# This file is part of cloud-init. See LICENSE file for license information.

""" Mcollective: Install, configure and start mcollective"""

import errno
import io
from textwrap import dedent

# Used since this can maintain comments
# and doesn't need a top level section
from configobj import ConfigObj

from cloudinit import log as logging
from cloudinit import subp, 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

PUBCERT_FILE = "/etc/mcollective/ssl/server-public.pem"
PRICERT_FILE = "/etc/mcollective/ssl/server-private.pem"
SERVER_CFG = "/etc/mcollective/server.cfg"

LOG = logging.getLogger(__name__)

MODULE_DESCRIPTION = """\
This module installs, configures and starts mcollective. If the ``mcollective``
key is present in config, then mcollective will be installed and started.

Configuration for ``mcollective`` can be specified in the ``conf`` key under
``mcollective``. Each config value consists of a key value pair and will be
written to ``/etc/mcollective/server.cfg``. The ``public-cert`` and
``private-cert`` keys, if present in conf may be used to specify the public and
private certificates for mcollective. Their values will be written to
``/etc/mcollective/ssl/server-public.pem`` and
``/etc/mcollective/ssl/server-private.pem``.

.. note::
    The ec2 metadata service is readable by non-root users.
    If security is a concern, use include-once and ssl urls.
"""

distros = ["all"]

meta: MetaSchema = {
    "id": "cc_mcollective",
    "name": "Mcollective",
    "title": "Install, configure and start mcollective",
    "description": MODULE_DESCRIPTION,
    "distros": distros,
    "examples": [
        dedent(
            """\
            # Provide server private and public key and provide the following
            # config settings in /etc/mcollective/server.cfg:
            # loglevel: debug
            # plugin.stomp.host: dbhost

            # WARNING WARNING WARNING
            # The ec2 metadata service is a network service, and thus is
            # readable by non-root users on the system
            # (ie: 'ec2metadata --user-data')
            # If you want security for this, please use include-once + SSL urls
            mcollective:
              conf:
                loglevel: debug
                plugin.stomp.host: dbhost
                public-cert: |
                    -------BEGIN CERTIFICATE--------
                    <cert data>
                    -------END CERTIFICATE--------
                private-cert: |
                    -------BEGIN CERTIFICATE--------
                    <cert data>
                    -------END CERTIFICATE--------
            """
        ),
    ],
    "frequency": PER_INSTANCE,
    "activate_by_schema_keys": ["mcollective"],
}

__doc__ = get_meta_doc(meta)
LOG = logging.getLogger(__name__)


def configure(
    config,
    server_cfg=SERVER_CFG,
    pubcert_file=PUBCERT_FILE,
    pricert_file=PRICERT_FILE,
):
    # Read server.cfg (if it exists) values from the
    # original file in order to be able to mix the rest up.
    try:
        old_contents = util.load_file(server_cfg, quiet=False, decode=False)
        mcollective_config = ConfigObj(io.BytesIO(old_contents))
    except IOError as e:
        if e.errno != errno.ENOENT:
            raise
        else:
            LOG.debug(
                "Did not find file %s (starting with an empty config)",
                server_cfg,
            )
            mcollective_config = ConfigObj()
    for (cfg_name, cfg) in config.items():
        if cfg_name == "public-cert":
            util.write_file(pubcert_file, cfg, mode=0o644)
            mcollective_config["plugin.ssl_server_public"] = pubcert_file
            mcollective_config["securityprovider"] = "ssl"
        elif cfg_name == "private-cert":
            util.write_file(pricert_file, cfg, mode=0o600)
            mcollective_config["plugin.ssl_server_private"] = pricert_file
            mcollective_config["securityprovider"] = "ssl"
        else:
            if isinstance(cfg, str):
                # Just set it in the 'main' section
                mcollective_config[cfg_name] = cfg
            elif isinstance(cfg, (dict)):
                # Iterate through the config items, create a section if
                # it is needed and then add/or create items as needed
                if cfg_name not in mcollective_config.sections:
                    mcollective_config[cfg_name] = {}
                for (o, v) in cfg.items():
                    mcollective_config[cfg_name][o] = v
            else:
                # Otherwise just try to convert it to a string
                mcollective_config[cfg_name] = str(cfg)

    try:
        # We got all our config as wanted we'll copy
        # the previous server.cfg and overwrite the old with our new one
        util.copy(server_cfg, "%s.old" % (server_cfg))
    except IOError as e:
        if e.errno == errno.ENOENT:
            # Doesn't exist to copy...
            pass
        else:
            raise

    # Now we got the whole (new) file, write to disk...
    contents = io.BytesIO()
    mcollective_config.write(contents)
    util.write_file(server_cfg, contents.getvalue(), mode=0o644)


def handle(name: str, cfg: Config, cloud: Cloud, args: list) -> None:

    # If there isn't a mcollective key in the configuration don't do anything
    if "mcollective" not in cfg:
        LOG.debug(
            "Skipping module named %s, no 'mcollective' key in configuration",
            name,
        )
        return

    mcollective_cfg = cfg["mcollective"]

    # Start by installing the mcollective package ...
    cloud.distro.install_packages(("mcollective",))

    # ... and then update the mcollective configuration
    if "conf" in mcollective_cfg:
        configure(config=mcollective_cfg["conf"])

    # restart mcollective to handle updated config
    subp.subp(["service", "mcollective", "restart"], capture=False)


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