#! /bin/sh
resize=0
thumb=0
quality=85

showHelp() {
	echo "-------------------------------------"
	echo " resize images and create thumbnails "
	echo "-------------------------------------"
	echo "Usage: `basename $0` -r #x# -t -f <folder|file>"
	echo ""
	echo "Options:"
	echo " -r #x#   = Rescale the image. WIDTHxHEIGHT. Optional."
	echo " -q #     = Specify the JPEG quality. Optional. Default is 85%."
	echo " -t       = Create 120x120 thumbnails"
	echo " -h       = Show this help."
	echo ""
	echo "Example:"
	echo " `basename $0` -r 1024x768 -f ~/Sites/webphotos"
}

verifyResult () {
	if [ $1 -ne 0 ]; then
		echo "Error during last operation. Exiting"
		exit $1
	fi
}

GetSize () {
# get file size of passed file var
	/usr/local/bin/du -sh "${1}" | awk '{print $1}'
}

GetType () {
# get file type of passed file var
	file "${1}" | awk -F : '{print $2}' | awk '{print $1}'
}

makeThumb() {
	echo -n "Making Thumbnail for ${1}..."
	convert -quality 60 -size 120x120 "${1}" -resize 120x120 +profile "*" "thumbs/${1}"
	echo "done"
}

rescaleImg() {
	echo -n "Rescaling Image ${1}: "
	oldsize=$(GetSize "${1}")
	echo -n "${oldsize} -> "
	mogrify -size ${2} -resize ${2} -quality ${3} +profile "*" "${1}"
	newsize=$(GetSize "${1}")
	echo "${newsize}"
}

if [ $# -eq 0 ] ; then
	echo "No valid arguments"
	showHelp
	exit
elif [ $1 = "-h" ] ; then
	showHelp
	exit
fi

while [ $# -ne 0 ]; do
	if [ $# -eq 0 ] ; then
		echo "No valid arguments"
		showHelp
		exit
	elif [ $1 = "-h" ] ; then
		showHelp
		exit
	elif [ $1 = "-r" ] ; then
		resize=1
		scale=${2}
		shift
		shift
	elif [ $1 = "-q" ] ; then
		quality=${2}
		shift
		shift
	elif [ $1 = "-t" ] ; then
		thumb=1
		shift
	else
	while [ $# -ne 0 ]; do
		folder=${1}
		filetype=$(GetType "${folder}")
		if [ $filetype = "JPEG" ]; then
			(verifyResult $?)
			if [ ${thumb} -eq 1 ] ; then
				mkdir -p "thumbs"
				(makeThumb "${folder}")
				(verifyResult $?)
			fi
			if [ ${resize} -eq 1 ] ; then
				(rescaleImg "${folder}" ${scale} ${quality})
				(verifyResult $?)
			fi
		elif [ $filetype = "directory" ]; then
			cd "${folder}"
			(verifyResult $?)
			if [ ${thumb} -eq 1 ] ; then
				mkdir -p "thumbs"
				(verifyResult $?)
			fi
			for wfile in *
			do
				isjpeg=$(GetType "${wfile}")
				if [ $isjpeg = "JPEG" ]; then
					if [ ${thumb} -eq 1 ] ; then
						(makeThumb "${wfile}")
						(verifyResult $?)
					fi
					if [ ${resize} -eq 1 ] ; then
						(rescaleImg "${wfile}" "${scale}")
						(verifyResult $?)
					fi
				fi
			done
		fi
		shift
		done
	fi
done