#!/usr/bin/env sh
set -e # exit on failure
IFS=$(printf '\n\t') # smarter ifs

jxl=0
if file "$1" | grep 'JPEG XL'; then
    jxl="$1"
    out=$(mktemp --suffix=.jpg)
    djxl "$1" "$out"
    shift
    set -- "$out" "$@"
fi

test "$RATIOW" || RATIOW=16
test "$RATIOH" || RATIOH=9
imagew=$(identify -format %w "$1")
des_ratio=$(printf '3 k %u %u / p' "$RATIOW" "$RATIOH" | dc)

des_height=$(printf '1 k %u %f / p' "$imagew" "$des_ratio" | dc | cut -d. -f1)
outfile="$(dirname "$1")/tran_$(basename "$1")"

jpegtran -crop "$imagew"x"$des_height" -outfile "$outfile" "$1"

if [ "$jxl" != 0 ]; then
    cjxl -e 8 "$outfile" "tran_$jxl"
    rm "$outfile" "$1"
fi