#!/bin/bash
# EdgeGuard — .deb builder.
#
# Pattern: direct dpkg-deb, no debhelper / dh_make / fpm.
# Mirrors mail-gateway/scripts/apt-repo/build-package.sh.
#
# Usage: build-package.sh <arch> [version]
#   Arches: amd64 · arm64
#
# Consumes: build/<arch>/edgeguard-{api,scheduler,ctl} (from `make build-linux-<arch>`)
# Output:   build/deb/edgeguard-api_<version>_<arch>.deb
set -euo pipefail

ARCH="${1:?Usage: $0 <arch> [version]}"
case "$ARCH" in amd64|arm64) ;; *) echo "unknown arch: $ARCH" >&2; exit 1 ;; esac

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
VERSION="${2:-$(cat "$REPO_ROOT/VERSION" 2>/dev/null || echo 0.0.1-dev)}"

OUT_DIR="$REPO_ROOT/build/deb"
mkdir -p "$OUT_DIR"

log() { echo "[build-package] $*"; }

# ── edgeguard-api ────────────────────────────────────────────────────────
build_api() {
    local pkg="edgeguard-api"
    local pkg_src="$REPO_ROOT/packaging/debian/$pkg"
    local build_dir
    build_dir="$(mktemp -d "/tmp/${pkg}-deb-XXXXXX")"
    trap 'rm -rf "$build_dir"' RETURN

    log "$pkg ($ARCH) version $VERSION"

    [ -d "$REPO_ROOT/build/$ARCH" ] || {
        log "binaries missing — run 'make build-linux-$ARCH' first" >&2; return 1; }

    mkdir -p "$build_dir/DEBIAN" \
             "$build_dir/usr/bin" \
             "$build_dir/etc/edgeguard" \
             "$build_dir/etc/systemd/system" \
             "$build_dir/usr/share/edgeguard/templates"

    # default config (conffile — survives upgrades, dpkg prompts on conflict)
    install -m 0644 "$REPO_ROOT/deploy/config/edgeguard.yaml" \
                    "$build_dir/etc/edgeguard/edgeguard.yaml"

    # control with version + arch substitution
    sed -e "s/__VERSION__/$VERSION/g" \
        -e "s/^Architecture:.*/Architecture: $ARCH/" \
        "$pkg_src/DEBIAN/control" > "$build_dir/DEBIAN/control"

    # maintainer scripts
    for s in preinst postinst prerm postrm; do
        [ -f "$pkg_src/DEBIAN/$s" ] || continue
        cp "$pkg_src/DEBIAN/$s" "$build_dir/DEBIAN/$s"
        chmod 0755 "$build_dir/DEBIAN/$s"
    done

    [ -f "$pkg_src/DEBIAN/conffiles" ] && cp "$pkg_src/DEBIAN/conffiles" "$build_dir/DEBIAN/"

    # binaries
    for bin in edgeguard-api edgeguard-scheduler edgeguard-ctl; do
        install -m 0755 "$REPO_ROOT/build/$ARCH/$bin" "$build_dir/usr/bin/$bin"
    done

    # systemd units
    install -m 0644 "$REPO_ROOT/deploy/systemd/edgeguard-api.service" \
                    "$build_dir/etc/systemd/system/"
    install -m 0644 "$REPO_ROOT/deploy/systemd/edgeguard-scheduler.service" \
                    "$build_dir/etc/systemd/system/"

    # Installed-Size in KB (rounded up)
    local size
    size="$(du -sk "$build_dir" | awk '{print $1}')"
    sed -i "s/^Installed-Size:.*/Installed-Size: $size/" "$build_dir/DEBIAN/control"

    # build
    local out="$OUT_DIR/${pkg}_${VERSION}_${ARCH}.deb"
    dpkg-deb --root-owner-group --build "$build_dir" "$out" >/dev/null
    log "→ $out ($(du -h "$out" | awk '{print $1}'))"
}

# ── edgeguard-ui (architecture: all) ─────────────────────────────────────
build_ui() {
    local pkg="edgeguard-ui"
    local ui_dist="$REPO_ROOT/management-ui/dist"
    if [ ! -d "$ui_dist" ] || [ -z "$(ls -A "$ui_dist" 2>/dev/null)" ]; then
        log "$pkg: management-ui/dist/ empty — skipping (run 'make ui' first)"
        return 0
    fi
    local pkg_src="$REPO_ROOT/packaging/debian/$pkg"
    local build_dir
    build_dir="$(mktemp -d "/tmp/${pkg}-deb-XXXXXX")"
    trap 'rm -rf "$build_dir"' RETURN

    log "$pkg version $VERSION (arch: all)"
    mkdir -p "$build_dir/DEBIAN" "$build_dir/usr/share/edgeguard/ui"
    sed -e "s/__VERSION__/$VERSION/g" "$pkg_src/DEBIAN/control" > "$build_dir/DEBIAN/control"
    cp -r "$ui_dist/." "$build_dir/usr/share/edgeguard/ui/"
    local size
    size="$(du -sk "$build_dir" | awk '{print $1}')"
    sed -i "s/^Installed-Size:.*/Installed-Size: $size/" "$build_dir/DEBIAN/control"
    local out="$OUT_DIR/${pkg}_${VERSION}_all.deb"
    dpkg-deb --root-owner-group --build "$build_dir" "$out" >/dev/null
    log "→ $out ($(du -h "$out" | awk '{print $1}'))"
}

# ── edgeguard meta ───────────────────────────────────────────────────────
build_meta() {
    local pkg="edgeguard"
    local pkg_src="$REPO_ROOT/packaging/debian/edgeguard-meta"
    local build_dir
    build_dir="$(mktemp -d "/tmp/${pkg}-meta-deb-XXXXXX")"
    trap 'rm -rf "$build_dir"' RETURN

    log "$pkg (meta) version $VERSION (arch: all)"
    mkdir -p "$build_dir/DEBIAN"
    sed -e "s/__VERSION__/$VERSION/g" "$pkg_src/DEBIAN/control" > "$build_dir/DEBIAN/control"
    local out="$OUT_DIR/${pkg}_${VERSION}_all.deb"
    dpkg-deb --root-owner-group --build "$build_dir" "$out" >/dev/null
    log "→ $out ($(du -h "$out" | awk '{print $1}'))"
}

build_api
build_ui
build_meta