#!/bin/sh

FILES="$*"

_error() {
    printf "error: %s\n" "$1"
}

DCRAW="${DCRAW:=dcraw}"
if ! command -v "$DCRAW" >/dev/null 2>&1; then
    _error "dcraw is not in PATH"
fi

MAGICK="${MAGICK:=convert}"
if ! command -v "$MAGICK" >/dev/null 2>&1; then
    _error "magick is not in PATH"
fi

IDENTIFY="${IDENTIFY:=identify}"
if ! command -v "$IDENTIFY" >/dev/null 2>&1; then
    _error "identify is not in PATH"
fi

DCRAW_OPTS="$DCRAW_OPTS -w"   # Use camera white balance, if possible
DCRAW_OPTS="$DCRAW_OPTS -q 3" # Set the interpolation quality
DCRAW_OPTS="$DCRAW_OPTS -T"   # Write TIFF instead of PPM
DCRAW_OPTS="$DCRAW_OPTS -6"   # Write 16-bit instead of 8-bit

MAGICK_OPTS="$MAGICK_OPTS -auto-orient" # Uses EXIF setting 'Orientation'
MAGICK_OPTS="$MAGICK_OPTS -noise 1"     # Denoise
MAGICK_OPTS="$MAGICK_OPTS -blur 0x0.5"
MAGICK_OPTS="$MAGICK_OPTS -sharpen 0.2x5"
MAGICK_OPTS="$MAGICK_OPTS -sigmoidal-contrast 6x35%"
MAGICK_OPTS="$MAGICK_OPTS -quality 90"
MAGICK_OPTS="$MAGICK_OPTS -define jpeg:extent=250kb"
MAGICK_OPTS="$MAGICK_OPTS \
    -channel R -evaluate multiply 0.995 \
    -channel B -evaluate multiply 1.005 \
    -channel RGB +channel" # Remove chromatic aberration

for f in $FILES; do
    $DCRAW $DCRAW_OPTS $f

    WIDTH="$($IDENTIFY -format "%w" ${f%.*}.tiff)"
    HEIGHT="$($IDENTIFY -format "%h" ${f%.*}.tiff)"

    if [ "$WIDTH" -ge "$HEIGHT" ]; then
        MAGICK_OPTS="$MAGICK_OPTS -resize x1080"
    else
        MAGICK_OPTS="$MAGICK_OPTS -resize 1080x"
    fi

    $MAGICK $MAGICK_OPTS ${f%.*}.tiff ${f%.*}.jpg
    rm "${f%.*}.tiff"
done