#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright (C) 2019 tribe29 GmbH - License: GNU General Public License v2
# This file is part of Checkmk (https://checkmk.com). It is subject to the terms and
# conditions defined in the file COPYING, which is part of this source code package.

# Example output of multi-unit stack (SS5500-EL, etc):
# SNMPv2-SMI::enterprises.43.45.1.6.1.1.1.3.65536 = Gauge32: 11
#
# Example outpout of multi-slot switche (SS8800 etc):
# SNMPv2-SMI::enterprises.43.45.1.6.1.1.1.3.0 = Gauge32: 11
# [...]
# SNMPv2-SMI::enterprises.43.45.1.6.1.1.1.3.12 = Gauge32: 16
# SNMPv2-SMI::enterprises.43.45.1.6.1.1.1.3.13 = Gauge32: 16

# Reasonably low warning and crit levels
switch_cpu_default_levels = (50, 75)


# We do not want to use the end OID as item since.
# We prefer "Switch 1 CPU 1" over "65537"...
def h3c_lanswitch_cpu_genitem(item):
    # decide switch class here (stacked or standalone/modular)
    cpuid = int(item)

    # if we have a cpuid lower than (hopefully) 256 it is not hashed with a unit ID
    if cpuid < 256:
        switchid = 1
        cputype = "Slot"
        cpunum = cpuid

    # othwise, if above 64k it is a known stackable switch
    elif cpuid >= 65536:
        switchid = cpuid // 65536
        cputype = "CPU"
        cpunum = cpuid % 65536

    # if we end up here 3com has added another hash method.
    else:
        switchid = 1
        cputype = "Unknown"
        cpunum = cpuid
    return "Switch %d %s %d" % (switchid, cputype, cpunum)


def inventory_h3c_lanswitch_cpu(info):
    return [(h3c_lanswitch_cpu_genitem(line[0]), "switch_cpu_default_levels") for line in info]


def check_h3c_lanswitch_cpu(item, params, info):
    warn, crit = params
    for line in info:
        if h3c_lanswitch_cpu_genitem(line[0]) == item:
            util = int(line[1])
            infotext = "average usage was %d%% over last 5 minutes." % util
            perfdata = [("usage", util, warn, crit, 0, 100)]

            if util > crit:
                return (2, infotext, perfdata)
            elif util > warn:
                return (1, infotext, perfdata)
            return (0, infotext, perfdata)

    return (3, "%s not found" % item)


check_info["h3c_lanswitch_cpu"] = (
    check_h3c_lanswitch_cpu,
    "CPU Utilization %s",
    1,
    inventory_h3c_lanswitch_cpu,
)

snmp_info["h3c_lanswitch_cpu"] = (
    ".1.3.6.1.4.1.43.45.1.6.1.1.1",
    [OID_END, "3"],  # 5-min average load.
)

# just a rough match that will handle most devices.
snmp_scan_functions["h3c_lanswitch_cpu"] = lambda oid: "3com s" in oid(".1.3.6.1.2.1.1.1.0").lower()
