#!/bin/bash

# if given no arguments, or flag args, then start wincd.  otherwise, we're
# being _called_ by wincd, so don't start it again!

WINCD_ARGS="-p 10 -z 2 -c -n 12 -s $0"
case $1 in

    -*|"")
    	echo "starting \"wincd $WINCD_ARGS $* & \""
    	wincd $WINCD_ARGS $* &
	echo "wincd is pid $!"
	exit 0
	;;

    *)	#single non-flag argument, must be the imagename
	if [ $# = 1 ]
	then
	    curimage=$1
	fi
    	;;
esac

if [ ! "$curimage" ]
then
	echo usage: $0 winc-args >&2
	echo or >&2
	echo usage: $0 image-filename >&2
	exit 1
fi

if [ ! -f "$curimage" ]
then
	echo $0: no such image-file: $curimage >&2
	exit 1
fi

# how much smaller should the thumbnails be?
# (set to null for no thumbnail images)
THUMBSCALE=0.375

#how many images total will we save?
KEEPFILES=10

#if we set NUMNAMES to null, no pretty names will be kept.
#NUMNAMES=12
NUMNAMES=

# the images will all be kept in IMAGEDIR
IMAGEDIR=/home/atmos2/rdewitt/HTML/camera/tmp

#if NUMNAMES is non-null, we'll keep symlinks to the N most
# recent images, and the symlinks will be named like so:
IMAGEPRETTYNAME=current		# plus ".jpg"
THUMBPRETTYNAME=thumb		# plus ".jpg"


#the real image and filenames will be like "img-DayHH:MM.jpg"
imagepref=img-
thumbpref=thmb-

# picture is take at approximately ${now}
now=$(date +%a%T)

# construct the final filenames
jpgimage=${IMAGEDIR}/${imagepref}${now}.jpg
thumbimage=${IMAGEDIR}/${thumbpref}${now}.jpg

cjpeg <$curimage >$jpgimage
[ "$THUMBSCALE" ] && pnmscale $THUMBSCALE $curimage | cjpeg >$thumbimage
rm $curimage

# list all the images, and remove any that are too old,
# i.e. any that are from $KEEPFILES+1 on up
KEEPFILES=$((KEEPFILES + 1))
rm -f $(ls -t ${IMAGEDIR}/${imagepref}*.jpg | 
				sed -n ${KEEPFILES}',$'p) 2>/dev/null
[ "$THUMBSCALE" ] &&
	rm -f $(ls -t ${IMAGEDIR}/${thumbpref}*.jpg |
				sed -n ${KEEPFILES}',$'p) 2>/dev/null

if [ ! "$NUMNAMES" ]
then
    exit 0
fi

# relink all the "well-known" names
# create a new suffix "", "1", "2", etc.
sufx=
count=0
for f in $(ls -t ${IMAGEDIR}/${imagepref}*.jpg | sed ${NUMNAMES}q )
do
    ln -s -f $f ${IMAGEDIR}/$IMAGEPRETTYNAME$sufx.jpg
    if [ "$sufx" ]
    then
	count=$((count + 1))
    else
	count=1
    fi
    sufx="-$count"
done

[ "$THUMBSCALE" ] || exit

sufx=
count=0
for f in $(ls -t ${IMAGEDIR}/${thumbpref}*.jpg | sed ${NUMNAMES}q )
do
    ln -s -f $f ${IMAGEDIR}/$THUMBPRETTYNAME$sufx.jpg
    if [ "$sufx" ]
    then
	count=$((count + 1))
    else
	count=1
    fi
    sufx="-$count"
done