#!/bin/bash
# SPDX-License-Identifier: Apache-2.0
# Build one vpp-maglev* Debian package for one architecture.
# Usage: build-deb.sh <package> <amd64|arm64> <version>
#
# <package> is one of:
#   vpp-maglevd — health-checker daemon + optional web dashboard,
#                 with both systemd units, the default config, and
#                 the /etc/default/vpp-maglev environment file.
#   vpp-maglev  — maglevc CLI client and maglevt out-of-band tester.
#                 Pure client-side tools, no systemd units, no conffiles.
#
# The commit hash is baked into the binaries at link time via -ldflags
# in the Makefile, so `maglevd --version` / `maglevc --version` / etc.
# are the source of truth for "which build". The .deb itself carries
# only the release version.
set -euo pipefail

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

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

echo "Building ${PKG}.deb"

install -d "$STAGING/DEBIAN"

case "$PACKAGE" in
vpp-maglevd)
    install -d "$STAGING/usr/sbin"
    install -d "$STAGING/usr/share/man/man8"
    install -d "$STAGING/lib/systemd/system"
    install -d "$STAGING/etc/default"
    install -d "$STAGING/etc/vpp-maglev"

    # Binaries. Both daemons live under /usr/sbin; they are long-running
    # services, not interactive tools.
    install -m 755 "$REPO_ROOT/build/${ARCH}/maglevd"          "$STAGING/usr/sbin/maglevd"
    install -m 755 "$REPO_ROOT/build/${ARCH}/maglevd-frontend" "$STAGING/usr/sbin/maglevd-frontend"

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

    # Systemd units
    install -m 644 "$REPO_ROOT/debian/vpp-maglev.service"          "$STAGING/lib/systemd/system/vpp-maglev.service"
    install -m 644 "$REPO_ROOT/debian/vpp-maglev-frontend.service" "$STAGING/lib/systemd/system/vpp-maglev-frontend.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 metadata
    sed "s/@VERSION@/${VERSION}/;s/@ARCH@/${ARCH}/" \
        "$REPO_ROOT/debian/vpp-maglevd.control.in" > "$STAGING/DEBIAN/control"
    install -m 644 "$REPO_ROOT/debian/vpp-maglevd.conffiles" "$STAGING/DEBIAN/conffiles"
    install -m 755 "$REPO_ROOT/debian/vpp-maglevd.postinst"  "$STAGING/DEBIAN/postinst"
    install -m 755 "$REPO_ROOT/debian/vpp-maglevd.prerm"     "$STAGING/DEBIAN/prerm"
    install -m 755 "$REPO_ROOT/debian/vpp-maglevd.postrm"    "$STAGING/DEBIAN/postrm"
    ;;

vpp-maglev)
    install -d "$STAGING/usr/bin"
    install -d "$STAGING/usr/share/man/man1"

    # Binaries. Both client tools live under /usr/bin so they land on
    # every login shell's PATH without needing /usr/sbin on PATH.
    install -m 755 "$REPO_ROOT/build/${ARCH}/maglevc" "$STAGING/usr/bin/maglevc"
    install -m 755 "$REPO_ROOT/build/${ARCH}/maglevt" "$STAGING/usr/bin/maglevt"

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

    # DEBIAN metadata. The client package has no conffiles and no
    # maintainer scripts — it ships binaries and manpages only.
    sed "s/@VERSION@/${VERSION}/;s/@ARCH@/${ARCH}/" \
        "$REPO_ROOT/debian/vpp-maglev.control.in" > "$STAGING/DEBIAN/control"
    ;;

*)
    echo "error: unknown package '${PACKAGE}' (expected vpp-maglevd or vpp-maglev)" >&2
    exit 2
    ;;
esac

# 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"