#!/usr/bin/env python3
# -*- coding: utf-8; py-indent-offset: 4 -*-
#
# Author:  Linuxfabrik GmbH, Zurich, Switzerland
# Contact: info (at) linuxfabrik (dot) ch
#          https://www.linuxfabrik.ch/
# License: The Unlicense, see LICENSE file.

# https://github.com/Linuxfabrik/monitoring-plugins/blob/main/CONTRIBUTING.md

"""See the check's README for more details."""

import argparse
import sys

import lib.args
import lib.base
import lib.qts
import lib.txt
import lib.url
import lib.version
from lib.globals import STATE_OK, STATE_UNKNOWN, STATE_WARN

try:
    import xmltodict
except ImportError:
    print('Python module "xmltodict" is not installed.')
    sys.exit(STATE_UNKNOWN)


__author__ = 'Linuxfabrik GmbH, Zurich/Switzerland'
__version__ = '2026040801'

DESCRIPTION = """Checks if firmware updates are available for a QNAP appliance running QTS by querying
the QNAP update API.
Alerts when firmware updates are available."""

DEFAULT_INSECURE = False
DEFAULT_NO_PROXY = False
DEFAULT_TIMEOUT = 6
DEFAULT_USERNAME = 'admin'


def parse_args():
    """Parse command line arguments using argparse."""
    parser = argparse.ArgumentParser(description=DESCRIPTION)

    parser.add_argument(
        '-V',
        '--version',
        action='version',
        version=f'%(prog)s: v{__version__} by {__author__}',
    )

    parser.add_argument(
        '--always-ok',
        help=lib.args.help('--always-ok'),
        dest='ALWAYS_OK',
        action='store_true',
        default=False,
    )

    parser.add_argument(
        '--insecure',
        help=lib.args.help('--insecure'),
        dest='INSECURE',
        action='store_true',
        default=DEFAULT_INSECURE,
    )

    parser.add_argument(
        '--no-proxy',
        help=lib.args.help('--no-proxy'),
        dest='NO_PROXY',
        action='store_true',
        default=DEFAULT_NO_PROXY,
    )

    parser.add_argument(
        '--password',
        help='QTS API password.',
        dest='PASSWORD',
        required=True,
    )

    parser.add_argument(
        '--timeout',
        help=lib.args.help('--timeout') + ' Default: %(default)s (seconds)',
        dest='TIMEOUT',
        type=int,
        default=DEFAULT_TIMEOUT,
    )

    parser.add_argument(
        '--url',
        help='QTS-based appliance URL. Example: `--url=https://192.168.1.1:8080`.',
        dest='URL',
        required=True,
    )

    parser.add_argument(
        '--username',
        help='QTS API username. Default: %(default)s',
        dest='USERNAME',
        default=DEFAULT_USERNAME,
    )

    args, _ = parser.parse_known_args()
    return args


def main():
    """The main function. This is where the magic happens."""

    # parse the command line
    try:
        args = parse_args()
    except SystemExit:
        sys.exit(STATE_UNKNOWN)

    auth_sid = lib.base.coe(lib.qts.get_auth_sid(args))

    # get system information
    url = (
        f'{args.URL}/cgi-bin/management/manaRequest.cgi'
        f'?subfunc=sysinfo&hd=no&multicpu=1&sid={auth_sid}'
    )
    result = lib.base.coe(
        lib.url.fetch(
            url, insecure=args.INSECURE, no_proxy=args.NO_PROXY, timeout=args.TIMEOUT
        )
    )
    data = xmltodict.parse(result)['QDocRoot']
    if data['authPassed'] == '0':
        lib.base.cu('Insufficient permissions.')

    installed_version = data['firmware']['version']
    installed_number = data['firmware']['number']
    installed_build = data['firmware']['build']

    # check for updates
    url = f'{args.URL}/cgi-bin/sys/sysRequest.cgi?subfunc=firm_update&sid={auth_sid}'
    result = lib.base.coe(
        lib.url.fetch(
            url,
            data=data,
            insecure=args.INSECURE,
            no_proxy=args.NO_PROXY,
            timeout=args.TIMEOUT,
        )
    )
    xmldict = xmltodict.parse(result)['QDocRoot']
    if 'newVersion' in xmldict['func']['ownContent']:
        # versions up to 5.0.1
        latest_version = xmldict['func']['ownContent']['newVersion']
    elif 'version' in xmldict['firmware']:
        # version 5.0.1+
        latest_version = xmldict['firmware']['version']
    else:
        lib.base.cu('Version information cannot be determined.')

    if latest_version == 'none':
        latest_version = None
    elif latest_version == 'error' or len(latest_version) == 0:
        lib.base.cu('Got an error from the QNAP API.')

    # build the message
    if lib.version.version('.'.join(installed_version)) >= lib.version.version(
        latest_version
    ):
        lib.base.oao(
            f'QTS v{installed_version}.{installed_number} Build {installed_build} is up to date',
            STATE_OK,
        )
    # over and out
    lib.base.oao(
        (
            f'QTS v{installed_version}.{installed_number}'
            f' Build {installed_build} installed,'
            f' QTS v{latest_version} available'
        ),
        STATE_WARN,
        always_ok=args.ALWAYS_OK,
    )


if __name__ == '__main__':
    try:
        main()
    except Exception:
        lib.base.cu()
