#!/bin/bash
# enable globbing properly
shopt -s extglob

# create the build dir if it doesn't already exist
mkdir -p ./build

# move all necessary files to the build dir
cp -r {assets,pack.png,pack.mcmeta} ./build

# change working dir into the build dir
cd build

# detect arch for downloading OxiPng
frfrarch=$(uname -m)
echo SYSTEM ARCHITECTURE IS $frarch
# get and use oxipng if it is available for your architecture
if [[ $frfrarch == "x86_64" ]]; then
    echo "downloading oxipng x64"
    wget -O oxipng.tar.gz https://github.com/shssoichiro/oxipng/releases/download/v9.1.3/oxipng-9.1.3-x86_64-unknown-linux-musl.tar.gz
elif [[ $frfrarch ==  "aarch64" ]]; then
    echo "downloading oxipng arm64"
    wget -O oxipng.tar.gz https://github.com/shssoichiro/oxipng/releases/download/v9.1.3/oxipng-9.1.3-aarch64-unknown-linux-musl.tar.gz
else
    echo unknown architecture, oxipng wont be used
fi

# banger size reduction on files in build dir yep
if [[ -e oxipng.tar.gz ]]; then
    tar -xvzf oxipng.tar.gz
    rm oxipng.tar.gz
    mv ./oxipng* ./oxipngdir
    mv ./oxipngdir/oxipng ./oxipng
    chmod +x oxipng
    oxipng -o max --strip all --alpha $(find . -name "*.png" -type f)

    # clean up the oxipng before build
    rm -rf oxipng
    rm -rf oxipngdir
fi

# remove all the gimp files (those don't do anything in the final build)
find . -name "*.xcf" -type f -delete

# zip all files in build dir recursively, into build.zip in base folder. use -0 flag to disable compression.
zip -r ../build.zip . -0

# change back to root dir
cd ..

# nuke the build dir
rm -r build

echo "file built to build.zip"