RUBY_BUILD_VERSION="${ASDF_RUBY_BUILD_VERSION:-v20200401}"
RUBY_BUILD_TAG="$RUBY_BUILD_VERSION"

echoerr() {
  >&2 echo -e "\033[0;31m$1\033[0m"
}

ensure_ruby_build_setup() {
  ensure_ruby_build_installed
}

ensure_ruby_build_installed() {
    local ruby_build_version

    if [ ! -f "$(ruby_build_path)" ]; then
        download_ruby_build
    else
        current_ruby_build_version="$("$(ruby_build_path)" --version | cut -d ' ' -f2)"
        # If ruby-build version does not start with 'v',
        # add 'v' to beginning of version
        if [ ${current_ruby_build_version:0:1} != "v" ]; then
          current_ruby_build_version="v$current_ruby_build_version"
        fi
        if [ "$current_ruby_build_version" != "$RUBY_BUILD_VERSION" ]; then
            # If the ruby-build directory already exists and the version does not
            # match, remove it and download the correct version
            rm -rf "$(ruby_build_dir)"
            download_ruby_build
        fi
    fi
}

download_ruby_build() {
    # Print to stderr so asdf doesn't assume this string is a list of versions
    echoerr "Downloading ruby-build..."
    local build_dir="$(ruby_build_source_dir)"

    # Remove directory in case it still exists from last download
    rm -rf $build_dir

    # Clone down and checkout the correct ruby-build version
    git clone https://github.com/rbenv/ruby-build.git $build_dir >&2 >/dev/null
    (cd $build_dir; git checkout $RUBY_BUILD_TAG >&2 >/dev/null)

    # Install in the ruby-build dir
    PREFIX="$(ruby_build_dir)" $build_dir/install.sh

    # Remove ruby-build source dir
    rm -rf $build_dir
}

asdf_ruby_plugin_path() {
    echo "$(dirname "$(dirname "$0")")"
}
ruby_build_dir() {
    echo "$(asdf_ruby_plugin_path)/ruby-build"
}

ruby_build_source_dir() {
    echo "$(asdf_ruby_plugin_path)/ruby-build-source"
}

ruby_build_path() {
    echo "$(ruby_build_dir)/bin/ruby-build"
}