#!/bin/sh
#
# @package      hubzero-mw-session
# @file         screenshot
# @author       Rick Kennell <kennell@purdue.edu>
# @author       Nicholas J. Kisseberth <nkissebe@purdue.edu>
# @copyright    Copyright (c) 2008-2015 HUBzero Foundation, LLC.
# @license      http://opensource.org/licenses/MIT MIT
#
# Copyright (c) 2008-2015 HUBzero Foundation, LLC.
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
# THE SOFTWARE.
#
# HUBzero is a registered trademark of HUBzero Foundation, LLC.
#

# @TODO: A custom xwd screenshot utility would be beneficial
#        which writes out to a useful file format natively

PATH=/usr/bin:/bin
export PATH

if [ "$1" = "" ]
then
	time=$(date +%Y-%m-%d-%H%M%S)
	xwd -root | xwdtopnm | pnmtopng > /tmp/screenshot-${time}.png
	exportfile -d /tmp/screenshot-${time}.png
else

	dirname=`dirname $1`
	basename=`basename $1`
	if [ "$dirname" = "" ]
	then
		exit 1
	fi
	if [ "$basename" = "" ]
	then
		exit 2
	fi

	if [ -f "$1" ]
	then
		if [ $(( $(date +%s) - $(stat -L --format %Y "$1") )) -lt 60 ]
		then
			echo "$1 is newer than 60 seconds"
			exit 0
		fi
	fi

	tmpfile=`mktemp --tmpdir=$dirname $basename-XXXXXXXXXX`
	if [ "$tmpfile" = "" ]
	then
		exit 3
	fi
	# we don't redirect directly to the target file because
        # it leaves us with 1-5 seconds of missing screenshot
        # data as bash truncates the file before even starting
        # the pipeline. cp keeps inode same (might be beneficial
        # but not relied upon as far as I know)
	xwd -silent -root | xwdtopnm | pnmtopng > $tmpfile
        cp $tmpfile $1
        rm $tmpfile
fi
