#!/bin/sh

if [[ $# -ne 1 ]]; then
    >&2 echo "Usage ./png_to_ora <png-file>"
    exit 1
fi

set -xe

PNG_PATH="$1"
PNG_FILE=$(basename "${PNG_PATH}")
PNG_NAME="${PNG_FILE%.*}"

mkdir -p "${PNG_NAME}/data"

echo "image/openraster" > "${PNG_NAME}/mimetype"
cp "${PNG_FILE}"          "${PNG_NAME}/data/layer-00.png"
echo "}"                > "${PNG_NAME}/data/layer-00-strokemap.dat"
cat <<EOF               > "${PNG_NAME}/stack.xml"
<?xml version='1.0' encoding='UTF-8'?>
<image xmlns:mypaint="http://mypaint.org/ns/openraster" h="3520" version="0.0.5" w="2496" mypaint:frame-active="false">
  <stack composite-op="svg:src-over" isolation="isolate" opacity="1.0" visibility="visible">
    <layer composite-op="svg:src-over" mypaint_strokemap_v2="data/layer-00-strokemap.dat" name="Layer" opacity="1.0" selected="true" src="data/layer-00.png" visibility="visible" x="0" y="0" mypaint:strokemap="data/layer-00-strokemap.dat" />
  </stack>
</image>
EOF

pushd "${PNG_NAME}"
zip -r ../"${PNG_NAME}.ora" *
popd
rm -r "${PNG_NAME}"