#!/bin/sh
set -eu

script_dir=$(CDPATH= cd -- "$(dirname -- "$0")" && pwd)
project_dir=$(CDPATH= cd -- "$script_dir/../.." && pwd)

version=0.1.0
release="$(date -u +%Y%m%d%H%M%S).$(git -C "$project_dir" rev-parse --short=8 HEAD)"
go_arch=$(go env GOARCH)

while [ "$#" -gt 0 ]; do
    case "$1" in
        --version)
            [ "$#" -ge 2 ] || { echo "--version requires a value" >&2; exit 2; }
            version=$2
            shift 2
            ;;
        --release)
            [ "$#" -ge 2 ] || { echo "--release requires a value" >&2; exit 2; }
            release=$2
            shift 2
            ;;
        --goarch)
            [ "$#" -ge 2 ] || { echo "--goarch requires a value" >&2; exit 2; }
            go_arch=$2
            shift 2
            ;;
        -h|--help)
            echo "usage: packaging/rpm/build-rpm.sh [--version <rpm-version>] [--release <rpm-release>] [--goarch amd64|arm64]"
            exit 0
            ;;
        *)
            echo "unknown argument: $1" >&2
            exit 2
            ;;
    esac
done

case "$version" in
    ""|*[!A-Za-z0-9._+]*|*-*)
        echo "RPM version contains an unsupported character: $version" >&2
        exit 2
        ;;
esac
case "$release" in
    ""|*[!A-Za-z0-9._+]*|*-*)
        echo "RPM release contains an unsupported character: $release" >&2
        exit 2
        ;;
esac

case "$go_arch" in
    amd64)
        rpm_arch=x86_64
        ;;
    arm64)
        rpm_arch=aarch64
        ;;
    *)
        echo "--goarch accepts only amd64 or arm64" >&2
        exit 2
        ;;
esac

mkdir -p "$project_dir/.build" "$project_dir/dist"
build_dir=$(mktemp -d "$project_dir/.build/rpm.XXXXXX")
trap 'rm -rf "$build_dir"' EXIT HUP INT TERM

top_dir="$build_dir/rpmbuild"
sources_dir="$top_dir/SOURCES"
temporary_dir="$build_dir/tmp"
mkdir -p "$sources_dir" "$top_dir/BUILD" "$top_dir/BUILDROOT" "$top_dir/RPMS" "$top_dir/SRPMS" "$temporary_dir"

echo "Building static linux/$go_arch yms-daemon"
(
    cd "$project_dir"
    GOCACHE="$build_dir/go-cache" CGO_ENABLED=0 GOOS=linux GOARCH="$go_arch" \
        go build -trimpath -ldflags="-s -w" -o "$sources_dir/yms-daemon" .
)

install -m 0640 "$project_dir/packaging/etc/yms-daemon/yms-daemon.toml" "$sources_dir/yms-daemon.toml"
install -m 0644 "$project_dir/packaging/systemd/yms-daemon.service" "$sources_dir/yms-daemon.service"
install -m 0644 "$project_dir/packaging/systemd/yms-backend@.service" "$sources_dir/yms-backend@.service"
install -m 0644 "$project_dir/packaging/tmpfiles.d/yms-daemon.conf" "$sources_dir/yms-daemon-tmpfiles.conf"

echo "Building $rpm_arch RPM version=$version release=$release"
TMPDIR="$temporary_dir" rpmbuild -bb "$project_dir/packaging/rpm/yms-daemon.spec" \
    --target "$rpm_arch" \
    --define "_topdir $top_dir" \
    --define "_tmppath $temporary_dir" \
    --define "package_version $version" \
    --define "package_release $release"

rpm_path="$top_dir/RPMS/$rpm_arch/yms-daemon-$version-$release.$rpm_arch.rpm"
if [ ! -f "$rpm_path" ]; then
    echo "rpmbuild did not create the expected RPM: $rpm_path" >&2
    exit 1
fi

output_path="$project_dir/dist/$(basename "$rpm_path")"
install -m 0644 "$rpm_path" "$output_path"
echo "$output_path"