# A script for offline creation of Piwigo thumbnails and alternate sized files.
#
# Easily expanded for more sizes, defined for default thumbnail, square, and medium sizes.
# Requires djpeg, pnmscale, and cjpeg which are found in the libjpeg/libturbojpeg package.
#
# Only processes jpg/jpeg files, please feel free to expand and share back.
#
# Directory assumptions: run from the piwigo/upload folder. Will iterate over years, months,
# and days but makes no attempt to crawl any further structure.
#
# The script assumes that the _data/i/upload/ directory exists and is referenced in BASE but
# will create the thumbnail directories as needed. Explicit or relative paths should work fine.
#
# If you manipulate the tree structure while the script is running, you own the broken results.
#
# I use the commandline ./makeThumbs.sh | tee thumb.txt for logging purposes. If you wish to speed
# the script up simply remove or comment out the echo lines.
#
# credits to https://www.cyberciti.biz/tips/howto-linux-creating-a-image-thumbnails-from-shell-prompt.html
# for the initial code

TYPES="*.jpg *.jpeg"
BASE=$(pwd)"/../_data/i/upload/"   # must be terminated with trailing "/"

for y in */; do
    echo "Processing uploads from year $y"
    cd $y
    if [ ! -d "$BASE$y" ]; then
        echo "Creating data directory $BASE$y"
        mkdir "$BASE$y"
    fi

    for m in */; do
        echo "Processing uploads from $y$m"
        cd $m
        if [ ! -d "$BASE$y$m" ]; then
            echo "Creating data directory $BASE$y$m"
            mkdir "$BASE$y$m"
        fi
        for d in */; do
            echo "Processing uploads from $y$m$d"
            cd $d
            if [ ! -d "$BASE$y$m$d" ]; then
                echo "Creating data directory $BASE$y$m$d"
                mkdir "$BASE$y$m$d"
            fi
               for f in $TYPES
               do
                 [ -f "$f" ] || continue
                 
                 NAME="${f%.*}"
                 EXTENSION="${f##*.}"
                 DIR=$BASE$y$m$d
                 TN=$NAME"-th."$EXTENSION
                 SQ=$NAME"-sq."$EXTENSION
                 ME=$NAME"-me."$EXTENSION
                 
                 echo "Checking "$(pwd)"/"$f
                 if [ ! -f $DIR$TN ]; then
                    FN=$DIR$TN
                    echo "Creating "$FN
                    djpeg $f | pnmscale -width 144 | cjpeg -optimize -progressiv -quality 75 > $FN
                 fi

                 if [ ! -f $DIR$SQ ]; then
                    FN=$DIR$SQ
                    echo "Creating "$FN
                    djpeg $f | pnmscale -xysize 120 120 | cjpeg -optimize -progressiv -quality 75 > $FN
                 fi

                 if [ ! -f $DIR$ME ]; then
                    FN=$DIR$ME
                    echo "Creating "$FN
                    djpeg $f | pnmscale -xysize 792 594 | cjpeg -optimize -progressiv -quality 95 > $FN
                 fi
               done
           cd ..
        done
        cd ..
    done
    cd ..
done