#!/bin/bash

# use newer version of imagick
export PATH=/home/www-lp/workspaces/bin:${PATH}

MIN_WIDTH=500
MIN_HEIGHT=500
MAX_WIDTH=3000
MAX_HEIGHT=3000
SRC_HOME=/home/www-lp/www/images/image
OUTPUT_HOME=/home/www-lp/www/images-${MIN_WIDTH}x${MIN_HEIGHT}--${MAX_WIDTH}x${MAX_HEIGHT}/image

smartresize() 
{
  filename="$1"
  geometry="$2"
  output_dir="$3"
  mogrify -path "$output_dir" -filter Triangle -define filter:support=2 -thumbnail $geometry -unsharp 0.25x0.08+8.3+0.045 -dither None -posterize 136 -quality 82 -define jpeg:fancy-upsampling=off -define png:compression-filter=5 -define png:compression-level=9 -define png:compression-strategy=1 -define png:exclude-chunk=all -interlace none -colorspace sRGB "$filename"
}

total=$(cd $SRC_HOME; find . -type f | wc -l)
count=0
IFS=$(echo -en "\n\b")
for f in $(cd $SRC_HOME; find . -type f)
do
  basename_filename=$(basename $f)
  filename="${SRC_HOME}/$f"
  wxh=$(identify -format "%[fx:w]x%[fx:h]" "$filename" 2>/dev/null)
  if [ ! -z "$wxh" ]
  then
    output_dir=$(dirname "${OUTPUT_HOME}/$f")
    [ -d $output_dir ] || mkdir -p $output_dir
    crc=$(cat $filename | sum)
    crc_file=$output_dir/.${basename_filename}.original-crc
    if [ "$crc" != "$(cat $crc_file 2>/dev/null)" ]
	# crc of original file has changed
    then
      w=${wxh/x*/}
      h=${wxh/*x/}
      if [ $w -gt ${MAX_WIDTH} -o $h -gt ${MAX_HEIGHT} ]
      then
        smartresize "$filename" ${MAX_WIDTH}x${MAX_HEIGHT} "$output_dir"
      elif [ $w -lt ${MIN_WIDTH} -o $h -lt ${MIN_HEIGHT} ]
      then
        # geometry option flag '^' used to resize the image based on the smallest fitting dimension
        smartresize "$filename" ${MIN_WIDTH}x${MIN_HEIGHT}^ "$output_dir"
      else
		[ -f $output_dir/$f ] && /bin/rm -f $output_dir/$f
        ln "$filename" "$output_dir"
      fi
      echo $crc > $crc_file # store sum of original picture to avoid unnecessary reprocessing of file
    fi
  fi
  count=$((count+1))
  # python -c "print '%02.02f%%' % (float($count)/$total*100)"
done

echo Done