#!/bin/bash

instance=asd
auth='-u user:pass'
curl="curl $auth"
remote='https://push.example.net/'
snrduration=10

if ! lsusb -d '0bda:2838' > /dev/null; then
    echo "no RTL-SDR found" 2> /dev/null
    exit 0
fi

mkdir -p /tmp/samples/

get_power() {
	rtl_power -f $1:$2:20k -c 0.3 -1 -i 3 2> /dev/null| \
		cut -d, -f7-|tr , '\n'|awk '{sum += $1; lines+=1; } END {print sum/lines }'
}

do_station() {
	freq=$1
	station=$2
	start=$((freq - 100000))
	end=$((freq + 100000))
	shortfreq=$(bc <<< "scale=1; $freq/1000000")

	power=$(get_power $start $end)
	cat <<EOF | $curl --data-binary @- "$remote/metrics/job/radio/instance/$instance/freq/$shortfreq/modulation/fm/station/$station"
#TYPE radio_power gauge
#HELP radio_power valore assoluto
radio_power $power
EOF
}


snr() {
	freq=$1
	station=$2
	shortfreq=$(bc <<< "scale=1; $freq/1000000")
	timeout -s INT $snrduration rtl_fm -g 50 -f "$freq" -M wfm -s 180k -E deemp | \
	       	sox -traw -r180k -es -b16 -c1 -V1 - -t ogg - | \
	       	pee "sponge /tmp/samples/$station.ogg" "sox - -n stats" "sox - -n stat" 2>&1 | \
		grep -vw -e Bit-depth -e NaN | grep -E '[0-9]$' |
		sed -e 's/\([^ ]\)  *\([-0-9]\)/\1=\2/;s/  */ /;s/^/radio_sox_/'| \
		tr ' ' _|tr -d '():' | \
		tr = ' ' | \
		while read line
		do
			echo $line | $curl --data-binary @- "$remote/metrics/job/radio/instance/$instance/freq/$shortfreq/modulation/fm/station/$station"
		done

	}

#(
#	if !  flock -n 9 ; then
#echo 'Error: sdr locked'
#exit 1
#fi

	do_station 87900000 ror
	do_station 87600000 rai1
	do_station 98400000 rai3
	do_station 102100000 freccia
	do_station 88100000 elle
	snr 87900000 ror
	snr 102100000 freccia
	snr 98400000 rai3
#	flock -u 9
#) 9> /var/lock/sdr.lock

# rds_out=$(./rds_check)
# ret=$?
# if [[ "$ret" -ne 3 ]]; then
#     echo -e "$(date +%s)\\t$ret\t$rds_out" >> "$datadir/rds.csv"
# fi