#!/bin/bash
# Build a vpp-maglev Debian package for one architecture.
# Usage: build-deb.sh <amd64|arm64> <version> <commit>
set -euo pipefail

ARCH="${1:?usage: build-deb.sh <amd64|arm64> <version> <commit>}"
VERSION="${2:?usage: build-deb.sh <amd64|arm64> <version> <commit>}"
COMMIT="${3:?usage: build-deb.sh <amd64|arm64> <version> <commit>}"

FULL_VERSION="${VERSION}~${COMMIT}"
REPO_ROOT="$(cd "$(dirname "$0")/.." && pwd)"
PKG="vpp-maglev_${FULL_VERSION}_${ARCH}"
STAGING="$(mktemp -d)"
trap 'rm -rf "$STAGING"' EXIT

echo "Building ${PKG}.deb"

# Directories
install -d "$STAGING/usr/sbin"
install -d "$STAGING/usr/bin"
install -d "$STAGING/usr/share/man/man1"
install -d "$STAGING/usr/share/man/man8"
install -d "$STAGING/lib/systemd/system"
install -d "$STAGING/etc/default"
install -d "$STAGING/etc/vpp-maglev"
install -d "$STAGING/DEBIAN"

# Binaries
install -m 755 "$REPO_ROOT/build/${ARCH}/maglevd" "$STAGING/usr/sbin/maglevd"
install -m 755 "$REPO_ROOT/build/${ARCH}/maglevc" "$STAGING/usr/bin/maglevc"

# Man pages
gzip -9 -c "$REPO_ROOT/docs/maglevd.8" > "$STAGING/usr/share/man/man8/maglevd.8.gz"
gzip -9 -c "$REPO_ROOT/docs/maglevc.1" > "$STAGING/usr/share/man/man1/maglevc.1.gz"

# Systemd unit
install -m 644 "$REPO_ROOT/debian/vpp-maglevd.service" "$STAGING/lib/systemd/system/vpp-maglevd.service"

# /etc/default/vpp-maglev  (conffile — dpkg won't overwrite on upgrade)
install -m 644 "$REPO_ROOT/debian/default.vpp-maglev" "$STAGING/etc/default/vpp-maglev"

# /etc/vpp-maglev/maglev.yaml  (conffile)
install -m 644 "$REPO_ROOT/debian/maglev.yaml" "$STAGING/etc/vpp-maglev/maglev.yaml"

# DEBIAN/control  (version field uses full_version including commit)
sed "s/@VERSION@/${FULL_VERSION}/;s/@ARCH@/${ARCH}/" \
    "$REPO_ROOT/debian/control.in" > "$STAGING/DEBIAN/control"

# DEBIAN/conffiles, postinst, prerm, postrm
install -m 644 "$REPO_ROOT/debian/conffiles" "$STAGING/DEBIAN/conffiles"
install -m 755 "$REPO_ROOT/debian/postinst"  "$STAGING/DEBIAN/postinst"
install -m 755 "$REPO_ROOT/debian/prerm"     "$STAGING/DEBIAN/prerm"
install -m 755 "$REPO_ROOT/debian/postrm"    "$STAGING/DEBIAN/postrm"

# Emit package into build/
mkdir -p "$REPO_ROOT/build"
OUT="$REPO_ROOT/build/${PKG}.deb"
dpkg-deb --build --root-owner-group "$STAGING" "$OUT"
echo "Built: $OUT"