#!/usr/bin/env bash
set -euo pipefail

if [[ $# -ne 1 || -z "$1" ]]; then
	echo "Usage: $0 VERSION" >&2
	exit 2
fi

version="$1"
if [[ ! "${version}" =~ ^[A-Za-z0-9][A-Za-z0-9._-]*$ ]]; then
	echo "VERSION must contain only letters, numbers, dots, underscores, or hyphens." >&2
	exit 2
fi
repository_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)"
dist_dir="${repository_dir}/dist"
packages_dir="${repository_dir}/packages"
package_name="netfishing-dedicated-server-${version}-linux-x86_64"
staging_dir="$(mktemp -d)"
trap 'rm -rf -- "${staging_dir}"' EXIT

if ! git -C "${repository_dir}" diff --quiet \
	|| ! git -C "${repository_dir}" diff --cached --quiet; then
	echo "Commit dedicated packaging changes before creating a release." >&2
	exit 1
fi

for filename in \
	NETfishingServer.x86_64 \
	NETfishingServer.pck \
	BUILD_INFO \
	SOURCE-CODE.md \
	SHA256SUMS; do
	if [[ ! -f "${dist_dir}/${filename}" ]]; then
		echo "Run scripts/stage-build.sh before packaging." >&2
		exit 1
	fi
done
for filename in \
	GPL-3.0-or-later.txt \
	ASSET-LICENSE.md \
	THIRD-PARTY-NOTICES.md \
	TRADEMARKS.md \
	CREDITS.md; do
	if [[ ! -f "${dist_dir}/licenses/${filename}" ]]; then
		echo "Staged build is missing licenses/${filename}." >&2
		exit 1
	fi
done
if ! grep -Fxq "game_version=${version}" "${dist_dir}/BUILD_INFO"; then
	echo "Staged BUILD_INFO does not match package version ${version}." >&2
	exit 1
fi
packaging_commit="$(
	awk -F= '$1 == "packaging_commit" {print tolower($2); exit}' \
		"${dist_dir}/BUILD_INFO"
)"
current_packaging_commit="$(git -C "${repository_dir}" rev-parse HEAD)"
if [[ "${packaging_commit}" != "${current_packaging_commit}" ]]; then
	echo "Staged BUILD_INFO does not match the current packaging commit." >&2
	exit 1
fi
release_tag="v${version}"
if ! release_commit="$(
	git -C "${repository_dir}" rev-parse --verify "refs/tags/${release_tag}^{commit}"
)"; then
	echo "Dedicated packaging tag ${release_tag} does not exist." >&2
	exit 1
fi
if [[ "${release_commit}" != "${current_packaging_commit}" ]]; then
	echo "Dedicated packaging tag ${release_tag} does not point to HEAD." >&2
	exit 1
fi
(cd -- "${dist_dir}" && sha256sum -c SHA256SUMS)

install -d "${staging_dir}/${package_name}"
install -m 0755 "${dist_dir}/NETfishingServer.x86_64" \
	"${staging_dir}/${package_name}/NETfishingServer.x86_64"
install -m 0644 "${dist_dir}/NETfishingServer.pck" \
	"${staging_dir}/${package_name}/NETfishingServer.pck"
install -m 0644 "${dist_dir}/BUILD_INFO" \
	"${staging_dir}/${package_name}/BUILD_INFO"
install -m 0644 "${dist_dir}/SHA256SUMS" \
	"${staging_dir}/${package_name}/SHA256SUMS"
install -m 0644 "${dist_dir}/SOURCE-CODE.md" \
	"${staging_dir}/${package_name}/SOURCE-CODE.md"
install -m 0644 "${repository_dir}/config/server.cfg.example" \
	"${staging_dir}/${package_name}/server.cfg"
install -m 0644 "${repository_dir}/README.md" \
	"${staging_dir}/${package_name}/README.md"
install -d "${staging_dir}/${package_name}/licenses"
for filename in \
	GPL-3.0-or-later.txt \
	ASSET-LICENSE.md \
	THIRD-PARTY-NOTICES.md \
	TRADEMARKS.md \
	CREDITS.md; do
	install -m 0644 "${dist_dir}/licenses/${filename}" \
		"${staging_dir}/${package_name}/licenses/${filename}"
done

mkdir -p -- "${packages_dir}"
archive="${packages_dir}/${package_name}.tar.gz"
tar --sort=name --mtime=@0 --owner=0 --group=0 --numeric-owner \
	-C "${staging_dir}" -czf "${archive}" "${package_name}"
cd -- "${packages_dir}"
sha256sum "${package_name}.tar.gz" > "${package_name}.tar.gz.sha256"
echo "Created ${archive}"