#!/usr/bin/env nix-shell
#!nix-shell -i bash -p bash coreutils curl jq 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)
trap "rm -rf $TMPDIR" EXIT

GPG_HOME=$TMPDIR/gpg-home
mkdir -p -m 700 "$GPG_HOME"

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

# Fetch nar-hash of release
cd $TMPDIR
baseUrl=https://github.com/$repo/releases/download/v$version
curl --silent -L -O $baseUrl/nar-hash.txt
curl --silent -L -O $baseUrl/nar-hash.txt.asc

# Verify signature for nar-hash
gpg --homedir $GPG_HOME --verify nar-hash.txt.asc &> /dev/null || {
    echo "Error: Signature verification failed. Please open an issue in the project repository."
    exit 1
}

>&2 echo "Fetched and verified release $version"

cat <<EOF
builtins.fetchTarball {
  url = "https://github.com/$repo/archive/v$version.tar.gz";
  sha256 = "$(cat nar-hash.txt)";
}
EOF