#!/usr/bin/env sh
# SPDX-FileCopyrightText: 2021 - 2023 Robin Vobruba <hoijui.quaero@gmail.com>
# SPDX-License-Identifier: Unlicense
#
# See the output of "$0 -h" for details.

# Exit immediately on each error and unset variable;
# see: https://vaneyckt.io/posts/safer_bash_scripts_with_set_euxo_pipefail/
#set -Eeuo pipefail
set -eu

script_path="$(readlink -f "$0")"
script_dir="$(dirname "$script_path")"
script_name="$(basename "$script_path")"
proj_root="$(cd "$script_dir/.."; pwd)"
build_dir="$proj_root/target"

print_help() {

	echo "$script_name - This exports the projects Inkscape SVGs"
	echo "to general SVGs (and PNGs), which should display correctly everywehre"
	echo "(e.g. web-browsers and file-explorers)."
	echo
	echo "Usage:"
	echo "  $script_name"
	echo "Options:"
	echo "  -h, --help"
	echo "    Shows this help message and exit"
}

# read command-line args
i=1
while [ "$i" -lt "$#" ]
do
	arg="$(eval "echo \$$i")"

	case "$arg" in
		-h|--help)
			shift "$i"
			print_help
			exit 0
			;;
		*) # non-/unknown option
			i=$((i + 1))
			;;
	esac
done

# Optimize SVG

if which svgo > /dev/null
then
	svg_optimize=true
else
	svg_optimize=false
	>&2 echo "WARN: Will not optimize exported SVGs, because tool 'svgo' was not found."
fi


export_single() {
	svg_in="$1"
	svg_out="${2:-${svg_in%.svg}-exported.svg}"
	png_out="${32:-${svg_out%.svg}.png}"

	# Export SVG
	printf 'INFO: Exporting (%s)\n\t"%s"\n\t->\n\t"%s"\n\t...\n' \
		"SVG" "$svg_in" "$svg_out"
	inkscape \
		"$svg_in" \
		--export-plain-svg \
		--export-type=svg \
		--export-filename="$svg_out"

	# Optimize SVG
	if $svg_optimize
	then
		printf 'INFO: Optimizing (%s)\n\t"%s"\n\t...\n' \
			"SVG" "$svg_out"
		svgo "$svg_out"
	fi

	# Export PNG
	printf 'INFO: Exporting (%s)\n\t"%s"\n\t->\n\t"%s"\n\t...\n' \
		"PNG" "$svg_in" "$png_out"
	inkscape \
		--export-background-opacity=0 \
		--export-type=png \
		--export-filename="$png_out" \
		"$svg_in"
}

mkdir -p "$build_dir"

for svg_in in res/media/img/*.svg
do
	svg_out="$build_dir/${svg_in%.svg}-exported.svg"
	png_out="${svg_out%.svg}.png"
	mkdir -p "$(dirname "$svg_out")"
	export_single "$svg_in" "$svg_out" "$png_out"
done
echo "INFO: done."