#!/bin/bash

case "$1" in A|a)

if [[ -f /tmp/channels ]]
        #find freqence
        then rm -rf /tmp/channles
fi
## use frequence table
for names in us-bcast us-cable us-cable-hrc us-cable-irc japan-bcast japan-cable europe-west europe-east italy newzealand australia ireland france china-bcast southafrica argentina australia-optus

do
exec ivtv-tune -t$names -l |awk '{print $2}' >> /tmp/channels
done

## if thers duplicated freqences sort it out :)
sort -u -o /tmp/channels /tmp/channels
echo "Please wait"
#numbers of freqences
numbers=`wc -l /tmp/channels |awk '{print $1}'`

for ((i=1; i<="$numbers"; i++))
do Channels[$i]=`cat /tmp/channels | sed -n ""$i"p"`

        if [[ `ivtv-tune -f${Channels[$i]} | grep -c "De"` = "1" ]]
        then echo "we got a signal @: ${Channels[$i]} Khz"
        sleep 1
        fi
done
;;
        M|m)
if [[ "$2" < "/dev/null" ]]
        then echo -e "I need a min freq to start with\n Ex: $0 M 50000 800000"
        exit 1;
fi

if [[ "$3" < "/dev/null" ]]
        then echo -e "I need a max freq to stop at Ex: $0 M $2 800000"
        exit 1;
fi

MIN_FREQ="$2"
MAX_FREQ="$3"


#make a freqence step of 250 Khz
for (( i="$MIN_FREQ" ; i<= "$MAX_FREQ" ; i+=250))
do
# make Khz to Mhz
freq=$(bc << EOF
scale = 3
($i/1000)
EOF
)

## check if we got a signal detected with ivtv-tune
if [[ `ivtv-tune -f $freq | grep -c "De"` = "1" ]]
        then echo "we got a signal @: ${i} Khz"
fi
done
;;
        *)
        echo "use $0 A or $0 M"
;;