#!/bin/bash

while read line; do
prev=$line
done < ./status

number=$1
drive=/dev/scd$number



group0=( $number $prev )

case $number in ( 0 | 1 ) group=1; z=25; f=47;;
		( 2 | 3 ) group=2; z=40; f=38;;
		( 4 | 5 ) group=3; z=50; f=32;;
		( 6 | 7 ) group=4; z=60; f=24;;
		( 8 | 9 ) group=5; z=70; f=17;;
	      ( 10 | 11 ) group=6; z=74; f=8;;
		
esac

case $prev in ( 0 | 1 ) groupp=1;;
	      ( 2 | 3 ) groupp=2;;
	      ( 4 | 5 ) groupp=3;;
	      ( 6 | 7 ) groupp=4;;
	      ( 8 | 9 ) groupp=5;;
	      ( 10 | 11 ) groupp=6;;
		
esac

# echo current group ${#grp[*]}

if [[ $number != $prev ]] && [[ $group == $groupp ]];
then
echo "collision!"
echo close $prev and open $number 
# python step.py $f; sleep 2; python step.py $z Z
eject /dev/scd$prev -ts; eject /dev/scd$number 
elif [[ $number == $prev ]];
then
echo "same?"
else
echo "no collision"
echo open $number and close $prev
eject /dev/scd$number -s; 
eject /dev/scd$prev -ts &
python step.py $z Z; sleep 1; python step.py $f;
fi

# echo temp array ${group0[*]}

echo $drive goes open
echo $number > ./status