#!/usr/lib64/linuxfabrik-monitoring-plugins/venv/bin/python
# -*- 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 re
import sys

import lib.args
import lib.base
import lib.huawei_pacific
import lib.lftest
import lib.txt
from lib.globals import STATE_CRIT, STATE_OK, STATE_UNKNOWN, STATE_WARN

__author__ = 'Linuxfabrik GmbH, Zurich/Switzerland'
__version__ = '2026081103'

DESCRIPTION = """Checks the status of all fans on a Huawei OceanStor Pacific storage system via the
REST API (/hwm/fan endpoint). Alerts when any fan reports a non-normal status.
Supports extended reporting via --lengthy."""

DEFAULT_CACHE_EXPIRE = 15  # minutes
DEFAULT_INSECURE = True
DEFAULT_NO_MATCH_SEVERITY = 'ok'
DEFAULT_NO_PROXY = False
DEFAULT_SCOPE = '0'
DEFAULT_TIMEOUT = 3

# Fields `--match` is applied to.
MATCH_FIELDS = ('frame_sn', 'name', 'node')


def parse_args():
    """Parse command line arguments using argparse."""
    parser = argparse.ArgumentParser(
        description=DESCRIPTION,
        epilog=lib.args.epilog(__file__),
        formatter_class=lib.args.HelpFormatter,
    )

    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(
        '--cache-expire',
        help=lib.args.help('--cache-expire') + ' Default: %(default)s',
        dest='CACHE_EXPIRE',
        type=int,
        default=DEFAULT_CACHE_EXPIRE,
    )

    parser.add_argument(
        '--ignore',
        help='Skip fans. '
        + lib.args.help('--ignore-regex')
        + ' The regex is anchored at the start of the string (Python `re.match`) and is '
        'matched against `frame_sn`, `name`, `node`, so prefix with `.*` to match anywhere.',
        dest='IGNORE',
        action='append',
        default=None,
    )

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

    parser.add_argument(
        '--lengthy',
        help=lib.args.help('--lengthy'),
        dest='LENGTHY',
        action='store_true',
        default=False,
    )

    parser.add_argument(
        '--no-insecure',
        help=lib.args.help('--no-insecure'),
        dest='INSECURE',
        action='store_false',
        default=DEFAULT_INSECURE,
    )

    parser.add_argument(
        '--match',
        help='Limit to fans. '
        + lib.args.help('--match')
        + ' The regex is anchored at the start of the string (Python `re.match`) and is '
        'matched against `frame_sn`, `name`, `node`, so prefix with `.*` to match anywhere.',
        dest='MATCH',
        action='append',
        default=None,
    )

    parser.add_argument(
        '--no-match-severity',
        help=lib.args.help('--no-match-severity') + ' Default: %(default)s',
        dest='NO_MATCH_SEVERITY',
        choices=['ok', 'warn', 'crit', 'unknown'],
        default=DEFAULT_NO_MATCH_SEVERITY,
    )

    parser.add_argument(
        '--no-perfdata',
        help=lib.args.help('--no-perfdata'),
        dest='NO_PERFDATA',
        action='store_true',
        default=False,
    )

    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='Huawei OceanStor Pacific API password.',
        dest='PASSWORD',
    )

    parser.add_argument(
        '--password-file',
        help=lib.args.help('--password-file'),
        dest='PASSWORD_FILE',
    )

    parser.add_argument(
        '--scope',
        help='Huawei OceanStor Pacific API scope.',
        dest='SCOPE',
        default=DEFAULT_SCOPE,
    )

    parser.add_argument(
        '--test',
        help=lib.args.help('--test'),
        dest='TEST',
        type=lib.args.csv,
    )

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

    parser.add_argument(
        '-u',
        '--url',
        help='Huawei OceanStor Pacific API URL.',
        dest='URL',
        required=True,
    )

    parser.add_argument(
        '--username',
        help='Huawei OceanStor Pacific API username.',
        dest='USERNAME',
        required=True,
    )

    parser.add_argument(
        '-v',
        '--verbose',
        help=lib.args.help('--verbose')
        + ' Appends what every API request returned, so the appliance\'s own answers '
        'can be read while working out how it reports something. Session tokens are '
        'redacted. The output is as long as those answers are, so this is a debugging '
        'aid rather than something to leave switched on.',
        dest='VERBOSE',
        action='store_true',
        default=False,
    )

    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)

    if args.PASSWORD_FILE:
        args.PASSWORD = lib.args.load_secret(args.PASSWORD_FILE)
    if not args.PASSWORD:
        lib.base.cu('Provide the API password via --password or --password-file.')

    # set default values for append parameters that were not specified
    if args.IGNORE is None:
        args.IGNORE = []
    if args.MATCH is None:
        args.MATCH = []

    if not args.URL.startswith('http'):
        lib.base.cu('--url parameter has to start with "http://" or https://".')

    # fetch data
    if args.TEST is None:
        # the hardware endpoint is node-scoped: enumerate the cluster nodes and
        # query the fans on all of them
        nodes = lib.huawei_pacific.get_cluster_nodes(args)
        result = lib.huawei_pacific.get_data(
            'hwm/fan',
            args,
            payload={'server_list': [node['management_ip'] for node in nodes]},
        )
    else:
        # do not call the API, put in test data. Each API call has its own fixture
        # suffix, so the fixture file names describe what they contain.
        test_base = args.TEST[0]
        nodes = (
            lib.lftest.test_json(args.TEST, f'{test_base}-servers').get('data') or []
        )
        result = lib.lftest.test_json(args.TEST, f'{test_base}-fans')

    # The hardware endpoint names the chassis by its serial number only, so the node an
    # operator would go and look at has to come from the cluster listing.
    node_names = lib.huawei_pacific.get_node_names_by_ip(nodes)

    # no valuable result?
    lib.huawei_pacific.assert_ok(result, 'the fans')

    # A cluster always has fans, so an empty list is a query that
    # never reached them rather than an inventory that is genuinely empty.
    # Reporting OK here would hide the fault behind a green check.
    if not result.get('data'):
        lib.base.oao(
            f'{args.URL} reported no fans.'
            ' Verify that the API user is allowed to query them.',
            STATE_UNKNOWN,
        )

    # init some vars
    msg = ''
    state = STATE_OK
    perfdata = ''
    compiled_match_regex = [
        lib.base.coe(item) for item in lib.txt.compile_regex(args.MATCH, '--match')
    ]
    compiled_ignore_regex = [
        lib.base.coe(item)
        for item in lib.txt.compile_regex(args.IGNORE, '--ignore')
    ]

    # analyze data
    table_data = []
    for fan in result.get('data') or []:
        if args.MATCH and not any(
            lib.base.coe(lib.txt.match_regex(pattern, str(fan.get(field, ''))))
            for pattern in compiled_match_regex
            for field in MATCH_FIELDS
        ):
            continue

        if args.IGNORE and any(
            lib.base.coe(lib.txt.match_regex(pattern, str(fan.get(field, ''))))
            for pattern in compiled_ignore_regex
            for field in MATCH_FIELDS
        ):
            continue

        fan['node'] = next(
            (
                node_names[ip]
                for ip in fan.get('management_ips') or []
                if ip in node_names
            ),
            '--',
        )

        fan_state = lib.huawei_pacific.get_component_status_state(
            fan.get('status')
        )
        state = lib.base.get_worst(state, fan_state)

        frame_sn = fan.get('frame_sn', '')
        label = re.sub(r'\W+', '_', f'{frame_sn}_{fan.get("name", "")}')
        perfdata += lib.base.get_perfdata(
            f'{label}_status',
            0 if fan_state == STATE_OK else 1,
            crit=1,
            _min=0,
            _max=1,
        )

        fan['state'] = lib.base.state2str(fan_state, empty_ok=False)
        table_data.append(fan)

    # The appliance listed fans and the filter selected none of them.
    if not table_data and args.MATCH:
        lib.base.oao(
            f'No fans matched `{", ".join(args.MATCH)}`.',
            lib.base.str2state(args.NO_MATCH_SEVERITY),
            always_ok=args.ALWAYS_OK,
            no_perfdata=args.NO_PERFDATA,
        )

    # build the message
    if state == STATE_CRIT:
        msg += 'There are critical errors.'
    elif state == STATE_WARN:
        msg += 'There are warnings.'
    else:
        msg += 'Everything is ok.'
    msg += '\n\n'

    # build table output
    if table_data:
        if args.LENGTHY:
            keys = ['node', 'frame_sn', 'name', 'status', 'state']
            headers = ['Node', 'Chassis SN', 'Name', 'Status', 'State']
        else:
            keys = ['node', 'name', 'status', 'state']
            headers = ['Node', 'Name', 'Status', 'State']
        msg += lib.base.get_table(
            table_data, keys, header=headers, missing='--', hide_empty=True
        )
    else:
        msg += 'Nothing checked.'

    if args.VERBOSE:
        msg += '\n\n' + lib.huawei_pacific.format_responses()

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


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