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

: << =cut

=head1 NAME

ina219 - Plugin to measure power consumption.

=head1 NOTES

=head1 AUTHOR

Contributed by Florian Klemenz

=head1 LICENSE

GPLv2

=head1 MAGIC MARKERS

 #%# family=auto
 #%# capabilities=autoconf

=cut

. $MUNIN_LIBDIR/plugins/plugin.sh

if [ "$1" = "autoconf" ]; then
        echo yes
        exit 0
fi

if [ "$1" = "config" ]; then

        echo 'graph_title Power'
        echo 'graph_args --base 1 -l 0 '
        echo 'graph_scale no'
        echo 'graph_vlabel mW'
        echo 'graph_category power'
        echo 'power.label power'
        echo 'power.draw LINE'
        print_warning power
        print_critical power
        exit 0
fi

ROUNDS=5

VOLTAGE=0
CURRENT=0
POWER=0

for i in $(seq ${ROUNDS}); do
    RESULT=$(/usr/bin/ina219)

    VOLTAGE_RAW=$(echo $RESULT | /bin/sed 's/\([0-9]\+\)mV \+\([0-9\.]\+\)mA/\1/')
    VOLTAGE=$(echo "scale=3; $VOLTAGE+$VOLTAGE_RAW" | /usr/bin/bc)

    CURRENT_RAW=$(echo $RESULT | /bin/sed 's/\([0-9]\+\)mV \+\([0-9\.]\+\)mA/\2/')
    CURRENT=$(echo "scale=3; $CURRENT+$CURRENT_RAW" | /usr/bin/bc)

done
    
VOLTAGE=$(echo "scale=3; $VOLTAGE/$ROUNDS" | /usr/bin/bc)
CURRENT=$(echo "scale=3; $CURRENT/$ROUNDS" | /usr/bin/bc)
POWER=$(echo "scale=3; $VOLTAGE*$CURRENT/1000000" | /usr/bin/bc)


echo "power.value $POWER"