#!/bin/bash
#
# images_resize Resizing large JPGs in current directory
# Based on: https://shkspr.mobi/blog/2016/12/converting-rar-to-zip-in-linux/
#
# Usage: xxx.sh

echo "Resizing large JPGs in $(pwd)"

MAX_PIXELS=8000000

find . -regextype posix-egrep -regex ".*\.(jpg|JPG|JPEG|jpeg)$" -print0 | while IFS= read -r -d '' f
do
    # Check pixel count before processing
    read -r IMG_W IMG_H < <(~/Applications/magick identify -format "%w %h" "$f" 2>/dev/null)
    if [[ -n "$IMG_W" && -n "$IMG_H" && $((IMG_W * IMG_H)) -le "$MAX_PIXELS" ]]; then
        echo "Skipping $f: ${IMG_W}x${IMG_H} already within limit"
        continue
    fi

    # Get file size before resizing
    SIZE_BEFORE=$(stat -f%z "$f" 2>/dev/null || stat -c%s "$f" 2>/dev/null)

    ~/Applications/magick "$f" -resize "${MAX_PIXELS}@@\>" -sampling-factor 4:2:0 -strip -quality 85%  "$f"

    # Get file size after resizing
    SIZE_AFTER=$(stat -f%z "$f" 2>/dev/null || stat -c%s "$f" 2>/dev/null)

    # Display before/after sizes
    echo "Resized $f: $(numfmt --to=iec-i --suffix=B $SIZE_BEFORE) -> $(numfmt --to=iec-i --suffix=B $SIZE_AFTER)"
done