#!/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 sys  # pylint: disable=C0413

import lib.base  # pylint: disable=C0413
from lib.globals import (STATE_CRIT, STATE_OK,  # pylint: disable=C0413
                          STATE_UNKNOWN, STATE_WARN)

try:
    import psutil  # pylint: disable=C0413
except ImportError:
    print('Python module "psutil" is not installed.')
    sys.exit(STATE_UNKNOWN)


__author__ = 'Linuxfabrik GmbH, Zurich/Switzerland'
__version__ = '2025020401'

DESCRIPTION = 'Return hardware fans speed. Fan speed is expressed in RPM (rounds per minute).'

DEFAULT_WARN  = 10000      # RPM
DEFAULT_CRIT  = 20000      # RPM


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(
        '-c', '--critical',
        help='Set the critical threshold for fan speed in RPM. Default: %(default)s',
        dest='CRIT',
        type=int,
        default=DEFAULT_CRIT,
    )

    parser.add_argument(
        '-w', '--warning',
        help='Set the warning threshold for fan speed in RPM. Default: %(default)s',
        dest='WARN',
        type=int,
        default=DEFAULT_WARN,
    )

    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)

    if not hasattr(psutil, 'sensors_fans'):
        lib.base.cu('Platform not supported.')

    # fetch data
    fans = psutil.sensors_fans()
    if not fans:
        lib.base.oao('No fans detected.', STATE_OK, always_ok=args.ALWAYS_OK)

    msg = ''
    state = STATE_OK
    perfdata = ''

    for name, entries in fans.items():
        msg += '{}: '.format(name)
        for entry in entries:
            perfdata += lib.base.get_perfdata('{}_{}'.format(name, entry.label).replace(' ', '_').lower(), entry.current, None, args.WARN, args.CRIT, 0, None)
            sensor_state = lib.base.get_state(entry.current, args.WARN, args.CRIT, 'ge')
            msg += '{} = {} RPM{}, '.format(entry.label or name, entry.current, lib.base.state2str(sensor_state, prefix=' (', suffix=')'))
            state = lib.base.get_worst(state, sensor_state)
        msg = msg[:-2] + '; '

    # over and out
    lib.base.oao(msg[:-2], state, perfdata, always_ok=args.ALWAYS_OK)


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