#!/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  # pylint: disable=C0413
import json  # pylint: disable=C0413
import sys  # pylint: disable=C0413

import lib.args  # pylint: disable=C0413
import lib.base  # pylint: disable=C0413
import lib.grassfish  # pylint: disable=C0413
import lib.human  # pylint: disable=C0413
import lib.lftest  # pylint: disable=C0413
from lib.globals import (STATE_OK, STATE_UNKNOWN,  # pylint: disable=C0413
                          STATE_WARN)

__author__ = 'Linuxfabrik GmbH, Zurich/Switzerland'
__version__ = '2025021501'

DESCRIPTION = """Alerts if no more Grassfish licenses are available, using the Grassfish API.
                 You must provide both the Grassfish hostname and a Grassfish token for this
                 check to work."""

DEFAULT_API_VERSION = '1.12'
DEFAULT_INSECURE = False
DEFAULT_NO_PROXY = False
DEFAULT_PORT = '443'
DEFAULT_TIMEOUT = 8
DEFAULT_URL = '/gv2/webservices/API'


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

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

    parser.add_argument(
        '--always-ok',
        help='Always returns OK.',
        dest='ALWAYS_OK',
        action='store_true',
        default=False,
    )

    parser.add_argument(
        '--api-version',
        help='Grassfish API Version. '
             'Default: %(default)s',
        dest='API_VERSION',
        default=DEFAULT_API_VERSION,
    )

    parser.add_argument(
        '-H', '--hostname',
        help='Grassfish hostname. '
             'Default: %(default)s',
        dest='HOSTNAME',
        required=True,
    )

    parser.add_argument(
        '--insecure',
        help='This option explicitly allows to perform "insecure" SSL connections. '
             'Default: %(default)s',
        dest='INSECURE',
        action='store_true',
        default=DEFAULT_INSECURE,
    )

    parser.add_argument(
        '--no-proxy',
        help='Do not use a proxy. '
             'Default: %(default)s',
        dest='NO_PROXY',
        action='store_true',
        default=DEFAULT_NO_PROXY,
    )

    parser.add_argument(
        '--port',
        help='Grassfish port. '
             'Default: %(default)s',
        dest='PORT',
        type=int,
        default=DEFAULT_PORT,
    )

    parser.add_argument(
        '--test',
        help='For unit tests. Needs "path-to-stdout-file,path-to-stderr-file,expected-retc".',
        dest='TEST',
        type=lib.args.csv,
    )

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

    parser.add_argument(
        '--token',
        help='Grassfish API token',
        dest='TOKEN',
        required=True,
    )

    parser.add_argument(
        '-u', '--url',
        help='Grassfish API URL. '
             'Default: %(default)s',
        dest='URL',
        default=DEFAULT_URL,
    )

    return parser.parse_args()


def main():
    """The main function. Hier spielt die Musik.
    """

    # parse the command line, exit with UNKNOWN if it fails
    try:
        args = parse_args()
    except SystemExit:
        sys.exit(STATE_UNKNOWN)

    # fetch data
    if args.TEST is None:
        result = lib.base.coe(lib.grassfish.fetch_json(
            args.TOKEN,
            args.HOSTNAME,
            args.PORT,
            args.URL,
            args.API_VERSION,
            'Licenses',
            insecure=args.INSECURE,
            no_proxy=args.NO_PROXY,
            timeout=args.TIMEOUT,
        ))
    else:
        # do not call the command, put in test data
        stdout, stderr, retc = lib.lftest.test(args.TEST)
        result = json.loads(stdout)

    # init some vars
    msg = ''
    state = STATE_OK
    perfdata = ''
    table_data = []

    # analyze data
    for lic in result:
        used = lic['TotalCount'] - lic['AvailableCount']
        if lic['AvailableCount'] == 0:
            lic_state = STATE_WARN
            msg += '{}, '.format(lic['Type'])
        else:
            lic_state = STATE_OK

        state = lib.base.get_worst(state, lic_state)
        table_data.append({
            'type': lic['Type'],
            'usage': '{}/{} ({} available{})'.format(
                used,
                lic['TotalCount'],
                lic['AvailableCount'],
                lib.base.state2str(lic_state, prefix=' '),
            )
        })
        perfdata += lib.base.get_perfdata('grassfish_lic_{}_used'.format(lic['Type'].lower()), used, None, None, None, 0, lic['TotalCount']) # pylint: disable=C0301

    # build the message
    if table_data:
        keys = [
            'type',
            'usage',
        ]
        headers = [
            'License Type',
            'Usage',
        ]

    if state == STATE_OK:
        msg = 'Everything is ok.\n\n'
    else:
        msg = 'No more licenses available: {}\n\n'.format(msg[:-2])
    msg += lib.base.get_table(table_data, keys, header=headers)

    # over and out
    lib.base.oao(msg, state, perfdata, always_ok=args.ALWAYS_OK)


if __name__ == '__main__':
    try:
        main()
    except Exception:   # pylint: disable=W0703
        lib.base.cu()
