#!/usr/bin/env bash
#
# Copyright (c) 2019 Mike Centola <mcentola@appliedengdesign.com>
#
# Please make sure the paths below are correct.
# Alternatively you can put them in $0.conf, meaning if you've named
# this script gpsd.sh then it must go in gpsd.sh.conf .
#
#
################################################################
# Don't change anything unless you know what are you doing     #
################################################################

BIN_GPIPE='/usr/bin/env gpspipe'
BIN_GREP='/usr/bin/env grep'
BIN_PYTHON='/usr/bin/env python'

# Check for config file
CONFIG=$0".conf"
if [ -f $CONFIG ]; then
    . $CONFIG
fi

# Create Temp File
TMPFILE=$(mktemp)
trap "rm -f $TMPFILE" 0 2 3 15

# Write GPSPIPE Data to Temp File
$BIN_GPIPE -w -n 10 > $TMPFILE

# Parse Temp file for GPSD Data
VERSION=`cat $TMPFILE | $BIN_GREP -m 1 "VERSION" | $BIN_PYTHON -c 'import sys,json;print json.load(sys.stdin)["rev"]'`
GPSDMODE=`cat $TMPFILE | $BIN_GREP -m 1 "mode" | $BIN_PYTHON -c 'import sys,json;print json.load(sys.stdin)["mode"]'`
HDOP=`cat $TMPFILE | $BIN_GREP -m 1 "hdop" | $BIN_PYTHON -c 'import sys,json;print json.load(sys.stdin)["hdop"]'`
VDOP=`cat $TMPFILE | $BIN_GREP -m 1 "vdop" | $BIN_PYTHON -c 'import sys,json;print json.load(sys.stdin)["vdop"]'`
LAT=`cat $TMPFILE | $BIN_GREP -m 1 "lat" | $BIN_PYTHON -c 'import sys,json;print json.load(sys.stdin)["lat"]'`
LONG=`cat $TMPFILE | $BIN_GREP -m 1 "lon" | $BIN_PYTHON -c 'import sys,json;print json.load(sys.stdin)["lon"]'`
ALT=`cat $TMPFILE | $BIN_GREP -m 1 "alt" | $BIN_PYTHON -c 'import sys,json;print json.load(sys.stdin)["alt"]'`
SATS=`cat $TMPFILE | $BIN_GREP -m 1 "SKY" | $BIN_PYTHON -c 'import sys,json;print len(json.load(sys.stdin)["satellites"])'`
SATSUSED=`cat $TMPFILE | $BIN_GREP -m 1 "SKY" | $BIN_PYTHON -c 'import sys,json;print len([sat for sat in json.load(sys.stdin)["satellites"] if sat["used"]])'`

# Output info for SNMP Extend
echo '{"data":{"mode":"'$GPSDMODE'", "hdop":"'$HDOP'", "vdop":"'$VDOP'", "latitude":"'$LAT'", "longitude":"'$LONG'", "altitude":"'$ALT'", "satellites":"'$SATS'", "satellites_used":"'$SATSUSED'"}, "error":"0", "errorString":"", "version":"'$VERSION'"}'

rm $TMPFILE