#!/bin/sh

## @file
## @brief This is a helper script that rotates image files according to the metadata
##
## Requirements: ImageMagick, exiftran, exiv2
##

GQ_METADATA_DIR="$HOME/.local/share/geeqie/metadata"

gq_exiftran()
{
	if ! [ -x "$(command -v exiftran)" ]
	then
		zenity --title="Geeqie rotate" --info --text="Exiftran is not installed" --window-icon=/usr/local/share/pixmaps/geeqie.png 2> /dev/null
		exit 0
	fi

	exiftran "$@"
}

gq_exiv2()
{
	if ! [ -x "$(command -v exiv2)" ]
	then
		zenity --title="Geeqie rotate" --info --text="Exiv2 is not installed" --window-icon=/usr/local/share/pixmaps/geeqie.png 2> /dev/null
		exit 0
	fi

	exiv2 "$@"
}

gq_mogrify()
{
	if ! [ -x "$(command -v mogrify)" ]
	then
		zenity --title="Geeqie rotate" --info --text="ImageMagick is not installed" --window-icon=/usr/local/share/pixmaps/geeqie.png 2> /dev/null
		exit 0
	fi

	mogrify "$@"
}

rotate()
{
	ext=$(echo "${1##*.}" | tr "[:upper:]" "[:lower:]")
	[ "$ext" = "" ] && return 1 #no extension

	gq_metadata="$GQ_METADATA_DIR/$1.gq.xmp"
	if [ -f "$gq_metadata" ]
	then
		gq_orientation=$(gq_exiv2 -PXkv "$gq_metadata" | grep Xmp.tiff.Orientation | sed -e "s|Xmp.tiff.Orientation *||")
		# shellcheck disable=2181
		[ $? != 0 ] && exit 1
	else
		gq_orientation=
	fi

	case "$ext" in
		jpg | jpeg)
			if [ -n "$gq_orientation" ]
			then
				gq_exiv2 -M "set Exif.Image.Orientation $gq_orientation" "$1"
				# shellcheck disable=2181
				[ $? != 0 ] && exit 1
			fi
			if gq_exiftran -aip "$1"
			then
				# exiftran ignores xmp, set it manually
				gq_exiv2 -M "set Xmp.tiff.Orientation 1" "$1"
				# shellcheck disable=2181
				[ $? != 0 ] && exit 1
				#http://dev.exiv2.org/issues/639
				if [ -n "$gq_orientation" ]
				then
					gq_exiv2 -M "set Xmp.tiff.Orientation 1" \
						-M "set Exif.Image.Orientation 1" "$gq_metadata"
					# shellcheck disable=2181
					[ $? != 0 ] && exit 1
				fi
				return 0
			else
				exit 1
			fi
			;;

		tif | tiff | png)
			if [ -n "$gq_orientation" ]
			then
				gq_exiv2 -M "set Exif.Image.Orientation $gq_orientation" "$1"
				# shellcheck disable=2181
				[ $? != 0 ] && exit 1
			fi
			if gq_mogrify -auto-orient "$1"
			then
				# mogrify ignores xmp, set it manually
				gq_exiv2 -M "set Xmp.tiff.Orientation 1" "$1"
				# shellcheck disable=2181
				[ $? != 0 ] && exit 1
				#http://dev.exiv2.org/issues/639
				if [ -n "$gq_orientation" ]
				then
					gq_exiv2 -M "set Xmp.tiff.Orientation 1" \
						-M "set Exif.Image.Orientation 1" "$gq_metadata"
					# shellcheck disable=2181
					[ $? != 0 ] && exit 1
				fi
				return 0
			else
				exit 1
			fi
			;;
		*) #not supported
			return 4
			;;
	esac
}

rotate_image_file()
{
	ext=$(echo "${3##*.}" | tr "[:upper:]" "[:lower:]")
	[ "$ext" = "" ] && return 1 #no extension

	case "$ext" in
		jpg | jpeg)
			gq_exiftran -i "$1" "$3"
			# shellcheck disable=2181
			[ $? != 0 ] && return 6
			return 0
			;;

		tif | tiff | png)
			gq_mogrify "$2" "$3"
			# shellcheck disable=2181
			[ $? != 0 ] && return 7
			return 0
			;;

		*) #not supported
			return 4
			;;
	esac
}

get_sidecars=
if [ "$1" = "-g" ]
then
	get_sidecars=yes
	shift
fi

rotate_image_file=
rotation=
if [ "$1" = "-r" ]
then
	rotate_image_file=yes
	shift
	rotation="$1"
	shift
fi

preserve_mtime=
if [ "$1" = "-t" ]
then
	preserve_mtime=yes
	shift
fi

if [ -n "$rotation" ]
then
	if [ "$rotation" = "0" ]
	then
		exit 0
	fi
	if [ "$rotation" = "2" ]
	then
		mogrify_param="-flop"
		exiftran_param="-F"
	fi
	if [ "$rotation" = "3" ]
	then
		mogrify_param="-rotate 180"
		exiftran_param="-1"
	fi
	if [ "$rotation" = "4" ]
	then
		mogrify_param="-flip"
		exiftran_param="-f"
	fi
	if [ "$rotation" = "5" ]
	then
		mogrify_param="-transpose"
		exiftran_param="-t"
	fi
	if [ "$rotation" = "6" ]
	then
		mogrify_param="-rotate 90"
		exiftran_param="-9"
	fi
	if [ "$rotation" = "7" ]
	then
		mogrify_param="-transverse"
		exiftran_param="-T"
	fi
	if [ "$rotation" = "8" ]
	then
		mogrify_param="-rotate -90"
		exiftran_param="-2"
	fi
fi

# iterate over files on commandline
for file in "$@"
do
	if [ -n "$get_sidecars" ]
	then
		# we got only one file for each group, typically the main one
		# get the sidecars:
		geeqie --get-sidecars="$file" | while read -r sidecar
		do
			# the main file is included in the sidecar file list, no special handling is required
			[ ! -w "$sidecar" ] && exit 5
			rotate "$sidecar"
			ret=$?
		done
		# Bourne shell runs DO loops in a sub-shell
		ret=$?
		[ "$ret" != 0 ] && exit "$ret"
	else
		[ ! -w "$file" ] && exit 5
		if [ -n "$rotate_image_file" ]
		then
			if [ -n "$preserve_mtime" ]
			then
				mtime=$(mktemp "${TMPDIR:-/tmp}/geeqie-rotate.XXXXXXXXXX") || exit 3
				touch --reference="$file" "$mtime"
			fi

			rotate_image_file "$exiftran_param" "$mogrify_param" "$file"
			ret=$?

			if [ -n "$preserve_mtime" ]
			then
				touch --reference="$mtime" "$file"
				rm "$mtime"
			fi
			[ "$ret" != 0 ] && exit "$ret"
		else
			rotate "$file"
			ret=$?
			[ "$ret" != 0 ] && exit "$ret"
		fi
	fi
done

exit 0
