#!/bin/bash
#  Copyright (c) 2013 Christoph von Thuelen
#
#  Author: Christoph von Thuelen  <Christoph AT von-Thuelen DOT de>
#
#  This program is free software; you can redistribute it and/or
#  modify it under the terms of the GNU General Public License as
#  published by the Free Software Foundation; either version 2 of the
#  License, or (at your option) any later version.
#
#  This program is distributed in the hope that it will be useful,
#  but WITHOUT ANY WARRANTY; without even the implied warranty of
#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
#  GNU General Public License for more details.
#
#  Following tools are required to do the job:
#  * sane-utils
#  * libtiff-tools
#  * imagemagick
#  * pdftk
#  * usbreset (workaround for Epson Perfection V300 Photo ;-) )

# config parameters
SCANAREA="-l 0 -t 0 -x 210 -y 297"    # app. DIN-A4 scan area
COUNTER=1                             # page counter, starting at page "1"
OUTPUTFILE="scan"                     # filename
MYSCANNER=epkowa                      # my scanner: Epson Perfection V300 Photo aka "epkowa"
CANSHOWPROGRESS=1                     # it is able to show the scan progress during scan

# Check some tools we need ...
if [ ! -f /usr/bin/tiff2pdf ]
then
  echo "ERROR - tiff2pdf is not installed. Please install libtiff-tools"
  exit 1
fi
if [ ! -f /usr/bin/scanimage ]
then
  echo "Error - scanimage is not installed.. Please install sane-utils"
  exit 1
fi
if [ ! -f /usr/bin/pdftk ]
then
  echo "Error - pdftk is not installed. Please install pdftk"
  exit 1
fi
if [ ! -f /usr/bin/convert ]
then
  echo "Error - convert is not installed. Please install imagemagick"
  exit 1
fi

function help {
  echo "Usage: `basename $0` -m {binary,gray,color} -r [resolution in dpi] -o <outputfile>"
  echo " -m: Scan mode can be: binary, gray or color"
  echo " -r: Resolution in dpi"
  echo " -o: Output file name w/o \".pdf\""
exit 1
}

# Show help text
if [ $# -eq "0" ]; then
  help
elif [ $1 = "--help" -o $1 = "-help" -o $1 = "-?" -o $1 = "-h" ]; then
  help
fi

# read options
while getopts ":m:r:o:" Option
do
  case $Option in
    m) SCANMODE=$OPTARG ;;
    r) RESOLUTION=$OPTARG ;;
    o) OUTPUTFILE=$OPTARG ;;
  esac
done

# scan images
if [ -f $OUTPUTFILE.pdf ]; then
    echo "Error - Output file: $OUTPUTFILE already exists!"
    exit 1
else
  echo "Batch mode, Output file: $OUTPUTFILE"
  scanimage -d $MYSCANNER --format tiff --mode $SCANMODE $SCANAREA --resolution $RESOLUTION $PROGRESS --batch --batch-prompt
  while [ -f out$COUNTER.tif ]; do
    # tiff2pdf -z out$COUNTER.tif -o out$COUNTER.pdf
    convert out$COUNTER.tif out$COUNTER.jpg
    convert out$COUNTER.jpg out$COUNTER.pdf
    COUNTER=$[COUNTER+1]
  done

  #concatinate scanned images to one single pdf
  pdftk out*.pdf cat output $OUTPUTFILE.pdf

  ## clean up
  rm out*.tif
  rm out*.pdf

  ## workaround for reset Epson Perfection V300 Photo scanner after batch scan
  DEVICE=`lsusb | grep -i epson | cut -d' ' -f 4| cut -d: -f1`
  BUS=`lsusb | grep -i epson | cut -d' ' -f 2`
  echo "BUS: $BUS, DEVICE: $DEVICE"
  usbreset /dev/bus/usb/$BUS/$DEVICE
fi
exit 0