#!/usr/bin/env python3

# SPDX-FileCopyrightText: © 2021 Open Networking Foundation <support@opennetworking.org>
# SPDX-License-Identifier: Apache-2.0

# utils.py
# The utility functions shared among nbhelper objects

import argparse
import logging
import re
import sys

import requests
import pynetbox

from ruamel import yaml

# Initialize module-level variables
netboxapi = None
netbox_config = None
netbox_version = None

# create shared logger
logging.basicConfig()
logger = logging.getLogger("nbh")


def initialize(extra_args):
    """
    Initialize the NBHelper module, the extra_args is required, it contains the
    NetBox API url, API token, and the name of site
    """
    global netboxapi, netbox_config, netbox_version

    args = parse_cli_args(extra_args)
    netbox_config = yaml.safe_load(args.settings.read())

    for require_args in ["api_endpoint", "token", "tenant_name"]:
        if not netbox_config.get(require_args):
            logger.error("The require argument: %s was not set. Stop.", require_args)
            sys.exit(1)

    netboxapi = pynetbox.api(
        netbox_config["api_endpoint"], token=netbox_config["token"], threading=True,
    )

    if not netbox_config.get("validate_certs", True):
        session = requests.Session()
        session.verify = False
        netboxapi.http_session = session

    netbox_version = netboxapi.version

    return args


def parse_cli_args(extra_args):
    """
    parse CLI arguments.  Can add extra arguments with a option:kwargs dict
    """

    parser = argparse.ArgumentParser(description="Netbox")

    # Positional args
    parser.add_argument(
        "settings",
        type=argparse.FileType("r"),
        help="YAML Ansible inventory file w/NetBox API token",
    )

    parser.add_argument(
        "--debug", action="store_true", help="Print additional debugging information"
    )

    for ename, ekwargs in extra_args.items():
        parser.add_argument(ename, **ekwargs)

    args = parser.parse_args()
    log_level = logging.DEBUG if args.debug else logging.INFO
    logger.setLevel(log_level)

    return args


def check_name_dns(name):

    badchars = re.search("[^a-z0-9.-]", name.lower(), re.ASCII)

    if badchars:
        logger.error(
            "DNS name '%s' has one or more invalid characters: '%s'",
            name,
            badchars.group(0),
        )
        sys.exit(1)

    return name.lower()


def clean_name_dns(name):
    return re.sub("[^a-z0-9.-]", "-", name.lower(), 0, re.ASCII)


def apply_as_router(output_yaml):
    """ Add the router-specific value for output structure """

    output_yaml.setdefault("netprep_router", True)
    output_yaml.setdefault("tftpd_files", ["undionly.kpxe"])
    output_yaml.setdefault(
        "vhosts", [{"name": "default", "default_server": True, "autoindex": True}]
    )
    output_yaml.setdefault("acme_username", "www-data")

    return output_yaml


class AttrDict(dict):
    def __init__(self, *args, **kwargs):
        super().__init__(*args, **kwargs)
        self.__dict__ = self