#!/bin/bash

cd $1

if [ "$2"x != ""x ] ; then
    EXT="$2"
fi

CHECKSUMS="sha1 md5" # sha512 sha256 

for SUM in $CHECKSUMS; do
	UPSUM=`echo $SUM | tr 'a-z' 'A-Z'`
	FILE=$UPSUM"SUMS"$EXT
	echo "Clearing $FILE"
	:> $FILE
done

# 2 calls to find here to get the ordering right - we *really* want to
# get the jigdo files first
for file in `find * -name \*.jigdo` `find * -name \*.iso`; do
    case $file in
        *.jigdo)
            iso=${file%%.jigdo}.iso
            JIGDO=1
            ;;
        *.iso)
            iso=$file
            JIGDO=0
            ;;
        *)
            echo "Found unexpected file $file!"
            exit 1
            ;;
    esac

	for SUM in $CHECKSUMS; do
		UPSUM=`echo $SUM | tr 'a-z' 'A-Z'`
		FILE=$UPSUM"SUMS"$EXT
		CMD="$SUM"sum

		grep -q $iso $FILE
		if [ $? -ne 0 ] ; then
			CKSUM=""
			if [ "$JIGDO" == 1 ] ; then
				CKSUM=`zcat -f $file | grep -i "Image Hex $CMD" | \
                       awk '{print $5}'`
			fi
			if [ "$CKSUM"x != ""x ] ; then
				echo "$CKSUM  $iso" >> $FILE
			else
				echo "No Jigdo help for $SUM, doing it the long way with $CMD"
				$CMD $iso >> $FILE
				grep $iso $FILE
			fi
		fi

	done
done