#!/bin/bash
PATH=/usr/bin

nmc_host='apc.jasomill.at'
style=""

function write_amps {
    damps="$1"
    amps="$(printf '%s.%s' "$((damps / 10))" "$((damps % 10))")"
    oamps="$(printf '⏦ %s A|%s' "$amps" "$style")"
    echo "$oamps"
}

apc_damps=
apc_status_summary=
apc_status=
while read -r i; do
    key="${i%%.0 = *}"
    key="${key#ups}"
    value="${i#* = }"
    if [ "$key" == 'HighPrecOutputCurrent' ]; then
        apc_damps="${value%% *}"
    fi
    if [ -z "$apc_status" ]; then
        apc_status_summary="$i"
    fi
    apc_status="$(printf '%s\n%s = %s' "$apc_status" "$key" "$value")"
done < <(snmpwalk -m PowerNet-MIB -Le -v 2c -c public -OQ -Os -CE upsBasicConfigNumDevices "$nmc_host" ups)
if [ -n "$apc_damps" ]; then
    write_amps "$apc_damps"
elif [ -n "$apc_status_summary" ]; then
    echo "$apc_status_summary|$style color=red"
else
    echo "(no status)|$style color=red"
fi
printf -- "---\nhttps://%s/|color=blue href=\"https://%s/\"%s" "$nmc_host" "$nmc_host" "$apc_status"