#!/bin/bash
# -*- sh -*-

# Munin plugin for TEMPer

. "${MUNIN_LIBDIR}/plugins/plugin.sh"

set -o nounset

# path to pcsensor
pcsensor=${pcsensor:-/usr/local/bin/pcsensor}

# device number
device=${device:-0}

# need calibration
#   example:
#     env.cdef  temperature,1.0287,*,0.85,-
cdef=${cdef:-temperature} 

retry=${retry:-1}

autoconf() {
    echo 'no'
}

config() {
    cat <<EOF
graph_title TEMPer
graph_category sensors
graph_scale no
graph_vlabel Temp C
graph_args --base 1000 
EOF

    "$pcsensor" | awk '$2 == '"$device"' { print $3 }' |
    while read -r label
    do
        echo "${label}.label ${label}"
        echo "${label}.cdef ${cdef}"

        if [ "$label" = 'humidity' ]; then
            echo "${label}.draw AREA"
            echo "graph_order humidity temperature"
        else
            echo "${label}.draw LINE"
        fi
    done
}

fetch() {
    local value i

    i=0
    while [ "$i" -le "$retry" ];
    do 
        value=$( "$pcsensor" | awk '$2 == '"$device"' { print $4 }' )

        if [ -n "$value" ];then
            break
        fi

        i=$(( i + 1 ))
        sleep 5
    done

    echo "temperature.value ${value}"
}

# Main
case ${1:-} in
autoconf)
    autoconf
    ;;
config)
    config
    [ "${MUNIN_CAP_DIRTYCONFIG:-}" = "1" ] && fetch
    ;;
*)
    fetch
    ;;
esac

exit 0