#!/bin/bash
# Usage: convert_multipage_library_to_fml.sh [--validate] {srcroot} {destroot}

if [ "$1" = "-validate" ]; then
	validate=true
	shift
fi

SRC=$1
DEST=$2

function usage(){
	msg=$1
	echo "ERROR: $msg"
	echo "Usage: convert_multipage_library_to_fml.sh {srcroot} {destroot}"
	exit 1
}

if [ ! -d "${SRC}" ]; then
	usage "Source directory is required"
fi
if [ ! -d "${DEST}" ]; then
	usage "Destination directory is required"
fi

if [ "${SRC}" = "${DEST}" ]; then
	usage "Source and destination may not be the same directory"
fi

echo "=== Processing source multipage documents from: ${SRC} ==="
prevdt=""
cvtargs="-density 300 -alpha off"
find "${SRC}" -type f | while read file; do
	doctype=`dirname "$file"`
	doctype=`basename "$doctype"`
	out="${DEST}/${doctype}"
	fn=`basename "$file"`
	extn="${fn##*.}"
	fn="${fn%.*}"
	outfn="${out}/${fn}-%04d.pdf"
	if [ "${prevdt}" != "${doctype}" ]; then
		echo ">>> $doctype"
	fi
	prevdt="${doctype}"
	echo "    SRC $file"
	echo "     => $outfn"
	#echo "fn: ${fn} extn: ${extn}"

	ok=`echo "$extn" | awk '/pdf|PDF|tif|tiff|TIF|TIFF/ {print $0; next}'`

	if [ "$ok" = "" ]; then
		echo "*** ERROR The input file '$file' is not a pdf or TIFF file"
		continue
	fi

#	validate (only)
	if [ "$validate" = "true" ]; then
		continue
	fi

#	create the output root
	mkdir -p "$out"
#   and the FML sub-dirs
	mkdir -p "$out/first"
	mkdir -p "$out/middle"
	mkdir -p "$out/last"

#	do the conversion
	convert ${cvtargs} "${file}" "${outfn}"

#	move pages to fml
	first=true
	last=""
	ls "${out}"/"${fn}"-*.pdf | (while read converted; do
		if [ $first = true ]; then
			mv "$converted" "$out/first"
			first=false
		else
			mv "$converted" "$out/middle"
			base=`basename "$converted"`
			last="$out/middle/$base"
		fi
	done

	if [ "$last" != "" ]; then
		mv "$last" "$out/last"
	fi
	)
	
done

exit 0;