#! /bin/sh

if [ "$1" = "-d" ]
then
	DEVICE="${2:-/dev/dvd}"
	shift
	shift
else
	DEVICE="/dev/dvd"
fi

getsum() {
  # now as some dvd's share label,lets checksum the dir
  mkdir /tmp/.dvd.$$
  mount ${1:-/dev/dvd} /tmp/.dvd.$$
  cd /tmp/.dvd.$$
  sum=`find . -ls | md5sum`
  set $sum ""
  cd /tmp
  umount /tmp/.dvd.$$
  rmdir /tmp/.dvd.$$
  echo $1
}

getid() {
  id="`mplayer -dvd-device "$DEVICE" -dvd 99 2>&1 > /dev/null | grep 'Using CSS Key-cache dir'`"
  id=`set "" $id && basename $6`

  if [ "$id" = "DVDVOLUME" ]
  then
    sum=`getsum $DEVICE`
    echo "$id.$sum"
  else
    echo "$id"
  fi

}

id=`getid`
echo "$id"

TRACKFILE=$HOME/.dvd/$id
if [ ! -f "$TRACKFILE" ]
then TRACKFILE=/usr/share/dvd/$id
fi
if [ -f $TRACKFILE ]
then TRACKS=`cat $TRACKFILE`
else TRACKS="$*"
fi

mplayer -alang en -dvd-device "$DEVICE" -vo xv -fs -zoom -dvd ${TRACKS:-1}
echo $TRACKFILE