#!/usr/bin/env sh

USER=$(head -n 1 "${HOME}/.env")
AUTHPASS=$(tail -n 1 "${HOME}/.env")
RRDFILES="${HOME}/rrdtool"
IMAGES="${HOME}/rrdimages"
WATERMARK="moonshadow.dev"
RRDTOOL="/usr/local/bin/rrdtool"
UPTIME=$(cat /tmp/uptime.txt)
NOW=$(date "+%Y-%m-%d %H:%M:%S %Z" | sed 's/:/\\:/g')

if ! test -f "${RRDFILES}/cpu.rrd"; then
    echo "Creating ${RRDFILES}/cpu.rrd"
    ${RRDTOOL} create "${RRDFILES}"/cpu.rrd --step 300 DS:ds0:GAUGE:600:U:U RRA:MAX:0.5:1:20000
fi

CPU_LOAD=$(snmp walk -l authPriv -u "$USER" -A "$AUTHPASS" -X "$AUTHPASS" -a SHA-256 localhost hrProcessorLoad.1 | awk '{print $4}')

${RRDTOOL} update "${RRDFILES}"/cpu.rrd N:"${CPU_LOAD}"

${RRDTOOL} graph "${IMAGES}"/cpu.png \
    --start -43200 \
    --title "moonshadow.dev - CPU" \
    --vertical-label "% CPU Used" \
    --watermark "${WATERMARK}" \
    DEF:CPU="${RRDFILES}"/cpu.rrd:ds0:AVERAGE \
    AREA:CPU#FFCC00 \
    LINE2:CPU#CC0033:"CPU" \
    GPRINT:CPU:MAX:"Max\:%2.2lf %s" \
    GPRINT:CPU:AVERAGE:"Average\:%2.2lf %s" \
    GPRINT:CPU:LAST:" Current\:%2.2lf %s\n" \
    COMMENT:"\\n" \
    COMMENT:"  SUM CPU Load / Active Cores = % CPU Used\n" \
    COMMENT:"  Up for ${UPTIME} at ${NOW}"