#!/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.human
import lib.lftest
import lib.nodebb
import lib.txt
from lib.globals import STATE_OK, STATE_UNKNOWN

__author__ = 'Linuxfabrik GmbH, Zurich/Switzerland'
__version__ = '2026050801'

DESCRIPTION = """Monitors NodeBB database statistics via the admin API, including memory usage and
connection counts. Alerts when thresholds are exceeded."""

DEFAULT_CRIT = 95
DEFAULT_INSECURE = False
DEFAULT_NO_PROXY = False
DEFAULT_SERVERITY = 'warn'
DEFAULT_TIMEOUT = 3
DEFAULT_URL = 'http://localhost:4567/forum'
DEFAULT_WARN = 90


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(
        '-c',
        '--critical',
        help=lib.args.help('--critical') + ' Default: >= %(default)s',
        dest='CRIT',
        type=int,
        default=DEFAULT_CRIT,
    )

    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(
        '--severity',
        help='Severity for alerts that do not depend on thresholds. '
        'One of "warn" or "crit". '
        'Default: %(default)s',
        dest='SEVERITY',
        default=DEFAULT_SERVERITY,
        choices=['warn', 'crit'],
    )

    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(
        '-p',
        '--token',
        help='NodeBB API bearer token.',
        dest='TOKEN',
        required=True,
    )

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

    parser.add_argument(
        '-w',
        '--warning',
        help=lib.args.help('--warning') + ' Default: >= %(default)s',
        dest='WARN',
        type=int,
        default=DEFAULT_WARN,
    )

    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)

    # fetch data
    if args.TEST is None:
        result = lib.nodebb.get_data(args, '/api/admin/advanced/database')
    else:
        # do not call the command, put in test data
        import json

        stdout, _stderr, _retc = lib.lftest.test(args.TEST)
        result = json.loads(stdout)

    # init some vars
    msg = ''
    state = STATE_OK
    perfdata = ''

    # analyze data
    fs_used_percent = round(
        float(result['mongo']['fsUsedSize'])
        / float(result['mongo']['fsTotalSize'])
        * 100,
        1,
    )
    db_fs_state = lib.base.get_state(fs_used_percent, args.WARN, args.CRIT)
    state = lib.base.get_worst(state, db_fs_state)
    if not result['mongo']['ok']:
        db_conn_state = lib.base.str2state(args.SEVERITY)
        state = lib.base.get_worst(state, db_conn_state)
    else:
        db_conn_state = STATE_OK

    perfdata += lib.base.get_perfdata(
        'db_collections',
        result['mongo']['collections'],
        _min=0,
    )
    perfdata += lib.base.get_perfdata(
        'db_fs_total',
        result['mongo']['fsTotalSize'],
        uom='B',
        _min=0,
    )
    perfdata += lib.base.get_perfdata(
        'db_fs_used',
        result['mongo']['fsUsedSize'],
        uom='B',
        _min=0,
    )
    perfdata += lib.base.get_perfdata(
        'db_fs_used_percent',
        fs_used_percent,
        uom='%',
        warn=args.WARN,
        crit=args.CRIT,
        _min=0,
        _max=100,
    )
    perfdata += lib.base.get_perfdata(
        'db_indexes',
        result['mongo']['indexes'],
        _min=0,
    )
    perfdata += lib.base.get_perfdata(
        'db_objects',
        result['mongo']['objects'],
        _min=0,
    )

    # build the message
    mongo = result['mongo']
    msg += (
        f'MongoDB "{mongo["db"]}"'
        f'{lib.base.state2str(db_conn_state, prefix=" ")}'
        f': {fs_used_percent}% Disk Usage'
        f' ({lib.human.bytes2human(mongo["fsUsedSize"])}/'
        f'{lib.human.bytes2human(mongo["fsTotalSize"])})'
        f'{lib.base.state2str(db_fs_state, prefix=" ")}'
        f', {mongo["collections"]}'
        f' {lib.txt.pluralize("collection", mongo["collections"])}'
        f', {mongo["indexes"]}'
        f' {lib.txt.pluralize("index", mongo["indexes"], "es")}'
        f', {lib.human.number2human(mongo["objects"])}'
        f' {lib.txt.pluralize("object", mongo["objects"])}'
    )

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


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