#!/bin/bash

# Usage:
#   ./build-arm64-bootstrap-tarball <bootstrap-dir> [SDK-version]

set -euo pipefail

set -x

function parse-nuget-name-version-from-file() {
    package=$1
    filename=${package##*/}

    version_suffix=$(echo "$filename" | grep -Eo '\.[[:digit:]]+.*\.nupkg')
    version=$(echo "$version_suffix" | sed -Ee 's/^\.//' -e 's/\.nupkg$//')
    name=${filename:0:(${#filename}-${#version_suffix})}

    echo "$name" "$version"
}

bootstrap_dir=$(readlink -f "$1")

sdk_version=${2:-$(jq -r  '.tools.dotnet' "$bootstrap_dir"/global.json)}

mkdir -p "dotnet-prebuilts-${sdk_version}-arm64"

pushd "dotnet-prebuilts-${sdk_version}-arm64"

# Binaries can be at one of several different URLs:
# GA releases:
if ! wget "https://dotnetcli.azureedge.net/dotnet/Sdk/${sdk_version}/dotnet-sdk-${sdk_version}-linux-arm64.tar.gz" ; then
    # Preview releases:
    wget "https://dotnetbuilds.azureedge.net/public/Sdk/${sdk_version}/dotnet-sdk-${sdk_version}-linux-arm64.tar.gz"
fi

for archive in "$bootstrap_dir"/prereqs/packages/archive/*.tar.gz; do
    mapfile -t linux_x64_packages < <(tar tf "$archive" | grep linux-x64)

    for package in "${linux_x64_packages[@]}"; do
        if [[ "$package" = *'.Intermediate.'* ]]; then
            continue;
        fi

        read -r name version < <(parse-nuget-name-version-from-file "$package")

        arm_name=${name/linux-x64/linux-arm64}

        # https://gist.github.com/omajid/c04b6025de49d0b7b18ab4a7e789484e
        nappo download --verbose "$arm_name" "$version"

    done
done

popd

tar czf "dotnet-prebuilts-${sdk_version}-arm64.tar.gz" "dotnet-prebuilts-${sdk_version}-arm64"