#! /usr/bin/env nix-shell
#! nix-shell -i bash -p bash coreutils curl jq gnugrep gnupg
set -euo pipefail

scriptDir=$(cd "${BASH_SOURCE[0]%/*}" && pwd)

REPO=fort-nix/nix-bitcoin
if [[ ! -v VERSION ]]; then
    VERSION=$(curl --silent "https://api.github.com/repos/$REPO/releases/latest" | jq -r '.tag_name' | tail -c +2)
fi

TMPDIR=$(mktemp -d)
GPG_HOME=$(mktemp -d)
trap "rm -rf $TMPDIR $GPG_HOME" EXIT

cd $TMPDIR
BASEURL=https://github.com/$REPO/releases/download/v$VERSION
curl --silent -L -O $BASEURL/SHA256SUMS.txt
curl --silent -L -O $BASEURL/SHA256SUMS.txt.asc

# Import key and verify fingerprint
gpg --homedir $GPG_HOME --import "$scriptDir/key-jonasnick.bin" &> /dev/null
gpg --homedir $GPG_HOME --list-keys 36C71A37C9D988BDE82508D9B1A70E4F8DCD0366 > /dev/null

gpg --homedir $GPG_HOME --verify SHA256SUMS.txt.asc &> /dev/null || {
    echo "ERROR: Signature verification failed. Please open an issue in the project repository."
    exit 1
}

SHA256=$(cat SHA256SUMS.txt | grep -Eo '^[^ ]+')
cat <<EOF
{
  url = "$BASEURL/nix-bitcoin-$VERSION.tar.gz";
  sha256 = "$SHA256";
}
EOF