#!/bin/bash
#
# zip_images_resize Resizing large JPGs in ZIPs
# Based on: https://shkspr.mobi/blog/2016/12/converting-rar-to-zip-in-linux/
#
# Usage: xxx.sh file [file ...]

echo "Resizing large JPGs in ZIPs"

# Use RAM disk for temporary files.
WORKDIR="/dev/shm/"

for INFILE in "$@"; do
    # Absolute path to old file
    #OLDFILE=`realpath "${INFILE}"`
    OUTFILE="${INFILE%.zip}-compress.zip"

    if [ ! -e "${OUTFILE}" ]; then
        rm "${OUTFILE}"
    fi
    # Set name for the temp dir. This directory will be created under WORKDIR
    TEMPDIR=`mktemp -p "$WORKDIR" -d`

    # Create a temporary folder for unRARed files
    echo "Extracting $INFILE"
    
    # extract files from zip
    unzip  "$INFILE"  -d "$TEMPDIR" # -j to junk directories

    # resize
    #convert '${TEMPDIR}/*.jpg' -set filename:fn '%[basename]' -resize 2800000@@\> -sampling-factor 4:2:0 -strip -quality 85% -colorspace RGB '%[filename:fn].jpg'

    pushd "$TEMPDIR"
    ~/images_resize.sh
    popd

    # Zip the files with no compression
    7z a -tzip -mx=0 "$OUTFILE" "${TEMPDIR}/*"

    if [ $? -ne 0 ]; then
        echo Exiting
        exit 1
    fi


    # Alternative. MUCH SLOWER, but better compression
    # 7z a -mm=Deflate -mfb=258 -mpass=15 -r "$NEWNAME" *

    # Preserve file modification time
    touch -r "$INFILE" "$OUTFILE"
    rm "$INFILE"
    mv "$OUTFILE" "$INFILE"

    # Delete the temporary directory
    rm -r "$TEMPDIR"

    # OPTIONAL. Safe-remove the old file
    #gio trash "$OLDFILE"

done

echo "Conversion Done"